Gotowe bibliografie tematyczne / Torque ripple

Gotowa bibliografia na temat „Torque ripple”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 11 września 2023

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Artykuły w czasopismach na temat "Torque ripple"

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Chu, Guoyu, Rukmi Dutta, Alireza Pouramin i Muhammed Fazlur Rahman. "Analysis of Torque Ripple of a Spoke-Type Interior Permanent Magnet Machine". Energies 13, nr 11 (5.06.2020): 2886. http://dx.doi.org/10.3390/en13112886.

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This paper investigates the theoretical reasons behind the low torque ripple of a fractional-slot concentrated-winding (FSCW) spoke-type interior permanent-magnet (IPM) machine obtained via a genetic algorithm-based optimization. To better understand the torque performance of the IPMM, this paper uses the frozen permeability method to segregate the overall torque into four components—magnet torque, reluctance torque, cogging torque, and the torque caused by cross-magnetization. Equations and detailed procedures of the torque separation method are discussed in the paper. Analysis of the separated torque components reveals that the counteraction between ripples of different torques leads to the low torque ripple. At high-load conditions, the magnetic saturation alters the torque ripples caused by cross-magnetization to offset ripples of other components resulting in minimization of the overall torque ripple. A detailed parametric analysis of the geometric parameters was carried out to understand their effect in producing minimum torque ripple in the optimized design. In the end, a prototype was built and used for the verification of the torque separation method and the analytical findings based on it.
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Et.al, Ravisankar B. "Analysis and Prediction of Cogging Torque and ripples in output Torque of Permanent Magnet Synchronous Motor and Line Start Permanent Magnet Synchronous Motor". Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, nr 3 (10.04.2021): 4586–95. http://dx.doi.org/10.17762/turcomat.v12i3.1851.

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Permanent magnet (PM) motors are rapidly replacing the squirrel cage induction motors for its energy efficient operation, smooth control and high power density. Although PM Motors are energy efficient, they are inherently affected by cogging torque and torque ripple. Magnetic alignment between teeth of stator and permanent magnet of rotors produce cogging torque. Torque ripple is a dynamic oscillation during steady-steady operation which leads to various mechanical anomalies like vibration, noise and rotor stress. Torque ripple is produced in PM motors because of non-sinusoidal distribution of flux, saturation, improper selection of slots etc., these ill effects will deteriorate the starting and steady-state performance of motors. So it is very vital to make analysis and prediction of cogging torque and torque ripples to make the motor more effective. Now a day's minimizing the torque ripples and cogging torque are gaining importance in PM motor designs. In this proposed work, the cogging torque analysis and torque ripple analysis of permanent magnet motor and line start permanent magnet motor has been done and reported.
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Thakur, Anant. "Improvement of Back EMF & Minimization of Torque Ripple of BLDC Motor". SMART MOVES JOURNAL IJOSCIENCE 5, nr 8 (6.08.2019): 1–7. http://dx.doi.org/10.24113/ijoscience.v5i8.220.

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In Brushless DC (BLDC) motor minimized the torque ripple with the help of electronically based commutators. When torque ripple is minimizes then copper loss is also minimizes. In this paper, our main aspect to decrease the torque ripples & improved the back emf of brushless dc (BLDC) motor. This paper shows that the torque produced by the BLDC motors with trapezoidal Back EMF is constant under ideal condition. Due to freewheeling torque ripples are produced which is reduced. In this paper rotor position is determined by the Zero Crossing Detection (ZCD) of back emf. Unlike old methods of calculating Back emf of the BLDC by creating a virtual neutral point, a complimentary method is used. This method provides a wide range of speed. A pre conditioning circuit is proposed to rectify the back emf at very low speed. The rotor position can be determined even in stand still condition to minimize the torque ripple and designed to overcome the disadvantages from other torque ripple decrease methods.
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Huang, Zhao, i Han Xiang Cheng. "Implementing Iterative Learning Control to Reduce Torque Ripple of Permanent Magnet Synchronous Machine". Advanced Materials Research 301-303 (lipiec 2011): 1676–81. http://dx.doi.org/10.4028/www.scientific.net/amr.301-303.1676.

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Permanent magnet synchronous machines (PMSM) are appealing candidates for many high-performance applications such as robotics, machine tools and other electrical propulsion system because of their attractive characteristics. PMSM have advantages of high power density, high torque-to-inertia ratio, and high electrical efficiency. However, the main disadvantage of PMSM is the torque ripples. Therefore, the study of how to compensate the torque ripples so as to improve the tracking performance of PMSM is very meaningful and necessary. In this paper, we focus on the control of a non-sinusoidal permanent magnet synchronous machine. First, we compare the various methods which to reduce the torque ripple. Then, we built a basic PMSM model. After that the Iterative Learning Control (ILC) algorithm is applied to compensate the torque ripple, and improve the tracking performance of the PMSM. The effectiveness of using ILC method to reduce torque ripple is demonstrated by simulink results.
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Akay, Ali, i Paul Lefley. "Torque Ripple Reduction Method in a Multiphase PM Machine for No-Fault and Open-Circuit Fault-Tolerant Conditions". Energies 14, nr 9 (2.05.2021): 2615. http://dx.doi.org/10.3390/en14092615.

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This paper presents a method that has been developed to reduce the torque ripples under healthy and open-circuit fault-tolerant (OCFT) conditions for a multiphase permanent magnet (PM) machine. For smooth torque, both the phase current and the back electromotive force (back-EMF) should be purely sinusoidal. To improve the torque in a multiphase machine, higher-order current harmonics are injected, which are related to the harmonics in the back-EMF. For this reason, generally, multiphase machines are designed with higher-order back-EMF harmonics. However, these harmonics produce ripples in the torque. In light of this, a torque ripple cancellation method has been developed that first determines an additional current component from the harmonic content of the back-EMF and then injects these additional components to cancel the torque ripple. It has been found that this new torque ripple cancellation method works for both faultless and faulty conditions in a five-phase PM machine. The method has been validated using Finite Element Analysis, and the results are presented in this paper.
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Pushparajesh, V., Nandish B. M. i H. B. Marulasiddappa. "Hybrid intelligent controller based torque ripple minimization in switched reluctance motor drive". Bulletin of Electrical Engineering and Informatics 10, nr 3 (1.06.2021): 1193–203. http://dx.doi.org/10.11591/eei.v10i3.3039.

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An inherent torque ripple characterizes switched reluctance technology from conventional technology. The ultimate aim of this paper is to reduce the torque ripple of the switched reluctance motor drive using genetic neural network controller based direct torque scheme. In the proposed controller network appropriate bits of data are chosen for training and testing. The proper selection of the learning rate and momentum will help in weight adjustment. Here the error is reduced which proves that the selection of voltage vectors from the vector table is precise and its results in better torque response over a wide range of speed. The simulation results reveal that the torque ripples vary between 3.25% to 1.7% for the variation in load torque and the drive speed. The experimental results for the proposed controller reveal that the torque ripple varies between 3.7% to 2.1%. Both the simulation and hardware results illustrate the efficiency of the controller.
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Qin, Yugui, Kaiyuan Wang i Huiran Luo. "Fuzzy Direct Torque Control of Surface Permanent Magnet Synchronous Motor". Journal of Physics: Conference Series 2396, nr 1 (1.12.2022): 012016. http://dx.doi.org/10.1088/1742-6596/2396/1/012016.

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Abstract To solve the problems of large torque and flux ripple in direct torque control (DTC) of permanent magnet synchronous motors (PMSM), a fuzzy controller is used to replace hysteresis comparators and switching tables in the DTC. Different from the conventional fuzzy controller which only outputs the angle or amplitude of the voltage vector, the controller adjusts the angle and value of the voltage vector at the same time in the surface PMSM DTC system is proposed. The inputs and output of the fuzzy controller are: stator flux, torque error, angle and amplitude of voltage vector in stator flux coordinate system. The simulation results of proposed fuzzy control system work normally. Compared with conventional fuzzy control systems, stator flux and torque ripples are decreased and only when motor speed is negative, torque ripple is a little higher. To suppress torque ripple at negative speed, two membership functions of torque error are designed and the fuzzy control system can select the proper membership function according to motor speed. Simulation results show adaptive fuzzy control system can effectively reduce torque and flux ripple in four quadrants.
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Li, Huanyu, Miao Li, Chenhong Zhengs i Bingqian Chen. "Comparison between Modified MPC and DTC Control Method for Permanent Magnet Synchronous Motor". E3S Web of Conferences 115 (2019): 02004. http://dx.doi.org/10.1051/e3sconf/201911502004.

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Direct torque control (DTC) and model predictive control (MPC) are widely used in the control of permanent magnet synchronous motor (PMSM). However, DTC for PMSM can cause large torque ripples and flux ripples, high harmonic distortion of the stator current, and high acoustic noises. Compared to DTC, MPC considers all possible switching states which can reduce the ripples of torque and flux. MPC with one-step delay compensation for PMSM and DTC with one-step delay compensation and two hysteresis comparators for PMSM have been proposed to solve some drawbacks of these two controllers. This paper makes a detailed comparison between these two improved control methods through Simulink and hardware experiments results to analyse the four indicators-torque ripple, flux ripple, transient time and THD of inverter current.
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Ahmed, Dris, Bendjebbar Mokhtar i Belaidi Aek. "DTC-ANN-2-level hybrid by neuronal hysteresis with mechanical sensorless induction motor drive using KUBOTA observer". International Journal of Power Electronics and Drive Systems (IJPEDS) 11, nr 1 (1.03.2020): 34. http://dx.doi.org/10.11591/ijpeds.v11.i1.pp34-44.

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In this paper, DTC is applied for two-level inverter fed IM drives based on neuronal hysteresis comparators and The Direct Torque Control (DTC) is known to produce quick and robust response in AC drive system. However, during steady state, torque, flux and current ripple. An improvement of electric drive system can be obtained using a DTC method based on ANNs which reduces the torque and flux ripples, the estimated the rotor speed using the KUBOTA observer method based on measurements of electrical quantities of the motor. The validity of the proposed methods is confirmed by the simulation results.The THD (Total Harmonic Distortion) of stator current, torque ripple and stator flux ripple are determined and compared with conventional DTC control scheme using Matlab/Simulink environment.
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Sheng, Linhao, Guofeng Wang, Yunsheng Fan, Jian Liu, Di Liu i Dongdong Mu. "An Improved Direct Predictive Torque Control for Torque Ripple and Copper Loss Reduction in SRM Drive". Applied Sciences 13, nr 9 (24.04.2023): 5319. http://dx.doi.org/10.3390/app13095319.

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This paper introduces a direct predictive torque control (DPTC) method to minimize the torque ripple and copper loss of the switched reluctance motor (SRM). Generally, there is a problem with torque ripple during the SRM’s commutation. In this method, the commutation optimization is provided by a direct predictive torque control algorithm. Firstly, the reachable range of phase torques is predicted and the boundary of two continuous phases is modified. By dividing the torque range directly to determine the torque allocation set, the suppression of torque ripple becomes simple. Secondly, considering the optimization problem of copper loss during commutation, a cost function only related to the phase current is constructed. Further, the minimization of copper loss can be achieved by solving the cost function, and the work of setting weight parameters is not required. Finally, the proposed DPTC method is tested by simulation and experiment in a three-phase 12/8-pole SRM drive system and the results are compared with the existing predictive torque control methods. The results show that the proposed method has less torque ripple and copper loss, which effectively improves the torque control performance.
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Rozprawy doktorskie na temat "Torque ripple"

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Abdalla, Abdelnassir. "Torque Ripple Minimization in Direct Torque Control of Induction Machines". University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1116121267.

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Kocybik, Peter Franz. "Electronic control of torque ripple in brushless motors". Thesis, University of Plymouth, 2000. http://hdl.handle.net/10026.1/2643.

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Brushless motors are increasingly popular because of their high power density, torque to inertia ratio and high efficiency. However an operational characteristic is the occurrence of torque ripple at low speeds. For demanding direct drive applications like machine tools, robot arms or aerospace applications it is necessary to reduce the level of torque ripple. This thesis presents an in depth investigation into the production and nature of torque ripple in brushless machines. Different torque ripple reduction strategies are evaluated and one reduction strategy using Park's transform as a tool is identified as the promising strategy. The unified machine theory is checked to clarify the theory behind Park's transform; in particular assumptions made and general validity of the theory. This torque ripple reduction strategy based on Park's transform is extended to include the effect of armature reaction. A novel adaptive torque ripple reduction algorithm is designed. The ineffectiveness of the conventional approach is demonstrated. Further a novel torque ripple reduction strategy using direct measurements of the torque ripple is suggested, reducing implementation time and allowing higher accuracies for torque ripple reduction. Extensive measurements from the experimental system show the validity of the novel torque ripple reduction strategies. The experimental results allow derivation of a formula for all load 111 situations. This formula makes it possible to further increase the reduction accuracy and enables improved real time implementation of the torque ripple reduction algorithm. The work presented here makes a substantial contribution towards understanding the nature of torque ripple in brushless motors and solving the associated problems. The novel reduction strategies form the basis for the development of intelligent dynamometers for motor test beds. Further the torque ripple reduction method presented here can be used to overcome manufacturing imperfections in brushless machines thus removing the cost for precise manufacturing tools. Future designs of controllers can "build" their own correction formula during set-up runs, providing a motor specific torque ripple correction. IV
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Hanekom, Alwyn Nicolaas. "A torque ripple analysis on reluctance synchronous machines". Thesis, Cape Peninsula University of Technology, 2006. http://hdl.handle.net/20.500.11838/1145.

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Thesis MTech(Electrical Engineering))--Cape Peninsula University of Technology, 2006
Reluctance Synchronous Machines (RSM) have, due to their rotor geometry, an inherently high torque ripple. This torque ripple is defined as the deviation of the minimum and maximum torque from the average value. It is unwanted as it indicates uneven pull on the rotor causing deformation of it and hence different air-gaps along the rotor circumference as well as acoustic noise. In applications such as power steering, robotics and radar positioning systems where high precision movement is vital, oscillating torque will lead to the malfunction of these devices and therefore suppressed the use and development of RSMs. Unlike the Induction machine (IM), the RSM has no copper losses in the rotor, which reduces the operating temperature significantly. With the development of electronic drives the quality of the output torque could be improved by means of accurate current- and flux space phasor control methods with much success and made the RSM a possible replacement for the IM. However, reducing torque ripple by means of purely geometrical changes is still a challenge to the machine designer. This thesis will focus on the reduction of torque ripple while leaving the average torque relatively unchanged by changing the rotor geometry. The rotor changes will take place by means of flux barriers and cut-outs while the stator has either semi-closed slots or magnetic wedges. In this work rotor structures with equal harmonic magnitudes but their angles 1800 apart. will be combined to form one machine and identify how torque harmonics respond. The change in average torque and power factor will be evaluated with all geometrical changes made to these machines throughout this work.
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Islam, Mohammed Rakibul. "Cogging Torque, Torque Ripple and Radial Force Analysis of Permanent Magnet Synchronous Machines". University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1239038005.

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Liu, Yong. "Direct torque control of permanent magnet brushless AC/DC drives with reduced torque ripple". Thesis, University of Sheffield, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.630444.

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Jackson, Deron K. (Deron Keith). "Torque-ripple compensation for an axial-airgap synchronous motor". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/38034.

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Greamo, Christopher Anthony. "Active torque ripple reduction in permanent-magnet AC motors". Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36575.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
Includes bibliographical references (leaves 101-104).
by Christopher Anthony Greamo.
M.S.
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KANT, SURYA. "TORQUE RIPPLE MINIMIZATION IN PERMANENT MAGNET SYNCHRONOUS MOTOR DRIVE". Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18869.

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Use of permanent magnets made of rare earth materials such as samarium cobalt and neodymium-boron-iron in Permanent Magnet Synchronous Motor (PMSM) drives has resulted in high flux density and improved performance of the drive. Field Oriented Control (FOC) has become one of the most popular speed and torque control techniques for AC motors. In PMSM drive detection/computation of rotor position is crucial for ensuring high performance during FOC. Rotor position is often sensed by incremental encoders or resolvers. The use of positon sensors in motor speed control increases the cost, size, weight and wiring complexity, and reduces the mechanical robustness and reliability of the PMSM drive systems. Sensor-less speed control techniques overcome these drawbacks related to estimation of speed and rotor position. The PMSMs are generally employed in industrial servo applications because of their fast dynamic performance. However, PMSMs suffers from ripples in the torque produced. Torque ripples in PMSM are produced because of cogging, current measurement error, switching of inverter and harmonics in magnetic flux. Torque ripples also leads to fluctuations in speed thus limiting the use of PMSM in several servo applications. Torque ripples could be minimized in applications that demand accurate speed/position tracking. The present work aims to explore use of different modern control techniques to minimize torque ripples in the operation of PMSM drives in comparison to previously reported control techniques. The objectives of the research include – a) modelling, design and development of laboratory prototype of PMSM drive, b) design and implementation of improved artificial neuro fuzzy inference system (ANFIS) based model reference adaptive control (MRAC) observer for sensor-less control of PMSM, v c) minimization of stator current ripples and torque ripples in PMSM drive using advanced predictive current controller (APCC) based on Dead Beat (DB) control theory d) minimization of torque ripples using intelligent hybrid controller (IHC) and e) torque ripple minimization by model predictive control of PMSM using proportional-plus- integral resonant (PI-RES) controller. The strategies to reduce torque ripples, that have been reported in the literature, may be classified into a) approaches based on the design improvement of the motor, b) methods based on control techniques or c) a combination of these two. The most critical aspect in high performance drive is the choice of the control algorithm that minimizes the torque ripples effectively for a given application. In this research work, a laboratory hardware prototype is designed and developed for real time analysis of PMSM drive based on sensor-less field-oriented control. An experimental setup is developed for implementation of FOC on PMSM using dSPACE DS1104 controller and performance of the drive is analysed using different control techniques. An improved ANFIS based MRAC observer is designed and implemented for FOC of PMSM with space vector PWM (SVPWM). In the proposed method adaptive model and adaptive mechanism are replaced by an improved ANFIS controller, which neutralize the effect of parametric variation and results in improved performance of the drive. The required rotor position and speed are estimated using the proposed MRAC observer. Simulation studies using MATLAB/Simulink and comparative analysis of the conventional MRAC based observer with improved ANFIS based MRAC observer show that better dynamic performance of the PMSM drive is achieved using the improved ANFIS based MRAC. vi An advanced predictive controller (APCC) based on deadbeat (DB) control theory is also developed and analysed for reduction of torque ripples in PMSM. The performance of the proposed APCC based on DB control theory are compared with hysteresis based direct current controller (DCC) and duty cycle-based model predictive controller (Duty-MPCC) under different operating condition through simulation studies using MATLAB/Simulink. It is observed that the implementation of proposed APCC results in better dynamic performance with less ripples in torque and stator currents, and lesser THD in stator current as compared to DCC and Duty-MPCC. An intelligent hybrid controller (IHC) has also been developed and implemented for FOC of PMSM to minimize torque ripples for constant torque operation. The proposed IHC is designed by combining a fuzzy logic controller (FLC) with PI controller with a novel switching capability. The intelligent switching decision of the developed IHC is based on overshoots, undershoots and oscillations observed in the system. Simulation studies for the FOC of PMSM using the proposed IHC indicates better dynamic performance with lesser torque ripples and lower THD in stator current in comparison with conventional PI controller. In addition, a proportional-plus-integral resonant (PI-RES) controller is designed and implemented for FOC of PMSM with model predictive controller (MPC) to minimize torque ripples for constant torque operation. The MPC is designed to provide the optimal voltage vector by minimizing the objective function calculated from stator current prediction for k th instant. The PI-RES controller is developed by combining a resonant controller with PI controller. Due to the compensating torque current produced by the resonant controller and reference current from the PI controller, ripples in the speed response are minimized. A PI- RES controller generates the reference pulsating torque current, which counteracts the ripples vii in load torque. The FOC of PMSM with MPC using PI-RES is simulated in MATAB/Simulink and the performance of the drive is compared with MPC using PI controller. The proposed FOC of PMSM with MPC using PI-RES demonstrate better dynamic performance, lower torque ripples and lower THD in stator current in comparison with conventional PI controller based MPC.
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Du, Le. "Control of Pseudo-Sinusoidal Switched Reluctance Motor with Zero Torque Ripple and Damped Input Current Ripple". Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23215.

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Switched reluctance motor(SRM)drives are favored in many industrial applications because of their cost advantage and ruggedness. However, the torque ripple and bus current ripple of SRM restrict its application range  compared with traditional AC and DC motors due to the doubly salient pole structure and the highly non-linear coupling between torque, rotor position and phase current. As a result of the torque ripple on the shaft, unwilling large acoustic noises are generated. The large current ripple at the DC bus input requires large electrolytic capacitors for attenuation. However, electrolytic capacitors are of low reliability, which will reduce the duration of the control system. Because of these disadvantages, the acceptance of SRM by the industry, especially in servo-type applications which require stationary torque at low speed, is quite slow. In order to obtain high quality control, there have been many efforts in developing techniques for torque ripple attenuation. Primarily, two approaches are used to give a smooth torque. One is to improve the magnetic design, the other is to use sophisticated control techniques. Some torque control techniques have been proved to obtain a relatively good performance by simulations and experimental results. This thesis gives an alternative torque ripple minimization technique. Simulations and Experiments are conducted to show the effectiveness of this new control scheme. Under this new control scheme, the current controller are much easier to be designed under high speed application, which could be an advantage of it.

First, the SRM operating principle is presented. The torque of SRM is produced by the tendency of its moveable part shifting to a position where the inductance of the exited winding is maximized. The torque ripple origin is discussed in terms of both magnetization and control. The torque ripple is produced during phase commutation interval because the phase current cannot rise from zero to the nominal value instantaneously due to the existence of the phase inductance.

Second, a new torque control scheme is proposed. The new torque control of SRM is split into two cascade sub-tasks. At first, a current reference for ripple free torque is determined. Then a current controller is designed to regulate the current in the stator winding to reference value. Simulations are conducted to verify the effective of this torque control scheme in both ideal `sinusoidal\' SRM and a `Pseudo-Sinusoidal\' SRM.

Finally, a motor drive control system is built to implement the new control scheme. The motor is tested under different speeds to see the torque ripple produced in different speed ranges.

As a conclusion, the new control algorithm for constant torque and damped input bus current ripple is investigated. The advantages of this new torque control method are listed in the paper. Simulation and experimental results show the effectiveness of this new control method.

Master of Science
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Ooi, Hoe Seng. "Position sensorless switched reluctance motor drive with torque ripple minimisation". Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398085.

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Książki na temat "Torque ripple"

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Laurila, Lasse. Analysis of torque and speed ripple producing non-idealities of frequency converters in electric drives. Lappeenranta: Lappeenranta University of Technology, 2004.

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A Fault-Tolerant Dual Three-Level Inverter Configuration for Multipole Induction Motor Drive with Reduced Torque Ripple. Kanyakumari, India: ASDF International, 2017.

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Części książek na temat "Torque ripple"

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Khorrami, Farshad, Prashanth Krishnamurthy i Hemant Melkote. "Torque Ripple Reduction for Step Motors". W Modeling and Adaptive Nonlinear Control of Electric Motors, 383–400. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-08788-6_15.

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Yuan, Yi, Mathieu Hubert, Stephane Moisy, Francois Auger i Luc Loron. "Intelligent Sensor Bearing for Torque Ripple Reduction". W Lecture Notes in Electrical Engineering, 631–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33829-8_59.

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Kim, In-Moon, Hwi-Su Kim i Jae-Bok Song. "Embedded Joint Torque Sensor with Reduced Torque Ripple of Harmonic Drive". W Advances in Intelligent Systems and Computing, 633–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-33932-5_59.

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Liao, Yusheng, Chi Zhang, Chongchong Wang, Chin-Yin Chen, Qiang Xin i Si-Lu Chen. "Modeling of Torque Ripple for Integrated Robotic Joint". W Intelligent Robotics and Applications, 740–50. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27526-6_65.

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Panda, Ashish Kumar, Giribabu Dyanamina i Rishi Kumar Singh. "Torque Ripple Reduction of PMSM Based Electric Vehicle". W Algorithms for Intelligent Systems, 289–300. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4103-9_25.

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Venkatesh, M., Vijayasri Varshikha Joshi, K. L. Mounika i B. Veeranarayana. "Control Scheme to Minimize Torque Ripple of SRM". W Advances in Intelligent Systems and Computing, 103–9. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7394-1_9.

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Ning, Bowen, Shanmei Cheng i Yi Qin. "Direct Torque Control of PMSM with Torque Ripple Reduction Based on Fuzzy Logic Control". W Communications in Computer and Information Science, 295–305. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-49014-3_27.

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Kurian, Stella, i G. K. Nisha. "Torque Ripple Minimization of SRM Using Sliding-Mode Current Controller and Torque-Sharing Function". W Lecture Notes in Electrical Engineering, 339–51. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7393-1_28.

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Credo, Andrea, Andrea Cristofari, Stefano Lucidi, Francesco Rinaldi, Francesco Romito, Marco Santececca i Marco Villani. "Design Optimization of Synchronous Reluctance Motor for Low Torque Ripple". W AIRO Springer Series, 53–69. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-25842-9_5.

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Jalili-Kharaajoo, Mahdi. "Fuzzy Logic Based Torque Ripple Minimization in Switched Reluctance Motors". W Current Topics in Artificial Intelligence, 354–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-25945-9_35.

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Streszczenia konferencji na temat "Torque ripple"

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Lovett, Benjamin A., i George T. C. Chiu. "Modeling and Experimental Verification of Torque Ripple in Permanent Magnetic DC Motors". W ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14399.

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In this paper we have developed a simple parametric model based on motor geometries to estimate the torque ripple in permanent-magnet DC (PMDC) motors. Torque ripple is the combined results of many different motor design parameters such as magnetic material properties and geometry as well as rotor slot geometry. As the PMDC motors are being used in more precision applications while being produced at a lower price, the effect of torque ripple is becoming an important issued for precision motion control. The main objective of this study is to identify motor parameters that affect the magnitude of the torque ripples as well as developing a cost effective measuring device for motor vendors. The analytical model focused on the effect of air gap volume on effective magnetic flux and in terms impact the torque generation. The effectiveness of the proposed model was verified by experimental data collected with motors from four large volume motor vendors that meets the same design specification. Sensitivity analysis was also performed to identify the key motor parameters that impacted the magnitude of the torque ripple.
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M. de Andrade Jr, Khristian, Hugo E. Santos, Wellington M. Vilela, i Geyverson T. de Paula. "Sinusoidal PWM Techniques in Rotor Pole Segmentation to Reduce Permanent Magnet Synchronous Machine Torque Ripple". W Congresso Brasileiro de Automática - 2020. sbabra, 2020. http://dx.doi.org/10.48011/asba.v2i1.1519.

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Torque ripples can cause mechanical stress in electrical machines, among otherproblems. The present paper proposes three methods to reduce these ripples in the permanent magnets synchronous machine considering rotor poles design. These methods consist in segmenting the rotor poles, with width and distances between segments obtained by SPWM techniques. The modulating wave is a sinwave which has the same frequency as the air gap flux density fundamental harmonic. Method 1 contemplates the unipolar SPWM technique, whereas methods 1 and 2 used the bipolar SWPM technique. Furthermore, the equations used to predict the cogging torque behavior are presented and verified by means of a finite element analysis. The torque ripple reduction is achieved due to the elimination of back-electromotive force harmonics and the decrease in the cogging torque peak. Method 1 has proved to be the most effective, reducing the torque ripple by 51.38% and 76.61% for the 4-pole and 8-pole machines, respectively. In addition, the magnet volume utilized has been reduced by 22.55% for the 4-pole machine, but the average torque value has been reduced by 18.7%. It is worth mentioning that the proposed methods do not require skewing to reduce the torque ripple.
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Mokhtari, Mohsen, i S. Alireza Davari. "Predictive torque control of DFIG with torque ripple reduction". W 2016 IEEE International Conference on Power and Energy (PECon). IEEE, 2016. http://dx.doi.org/10.1109/pecon.2016.7951661.

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Salminen, P., M. Niemela, J. Pyrhonen i J. Mantere. "High-torque low-torque-ripple fractional-slot PM-motors". W International Electric Machines and Drives Conference. IEEE, 2005. http://dx.doi.org/10.1109/iemdc.2005.195715.

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Stamenkovic, I., D. Jovanovic i S. Vukosavic. "Torque Ripple Verification in PM Machines". W EUROCON 2005 - The International Conference on "Computer as a Tool". IEEE, 2005. http://dx.doi.org/10.1109/eurcon.2005.1630248.

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Karuppaian, Anupama, Vyas Swapnil, Vrashabha Bolagond i Sanjay Gupta. "Acoustic Noise Reduction by Reducing Torque Ripple in Traction Machines". W Automotive Technical Papers. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2023. http://dx.doi.org/10.4271/2023-01-5046.

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<div class="section abstract"><div class="htmlview paragraph">This paper discusses on the reduction techniques adopted to reduce torque ripple in an electric machine, which in turn reduces the noise generated within electric machine during driving condition. Source-based noise reduction techniques such as the impact of slot-opening width, use of notches, use of wedges, and its combination are explained with specific design tips. Simulation results show that use of wedges results in 7% reduction in torque ripple when compared with other configurations. In addition to the torque ripple reduction, it also reduces overall system torque. Therefore, additional methods are discussed to increase the system torque and reduce torque ripple by 6%.</div></div>
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Nakao, Noriya, i Kan Akatsu. "Torque ripple control for synchronous motors using instantaneous torque estimation". W 2011 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2011. http://dx.doi.org/10.1109/ecce.2011.6064094.

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Gupta, R. A., Rajesh Kumar i Borra Suresh Kumar. "Direct Torque Controlled Induction Motor Drive with Reduced Torque Ripple". W 2006 IEEE International Conference on Industrial Technology. IEEE, 2006. http://dx.doi.org/10.1109/icit.2006.372526.

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Li, Zhenguo, Lu Wang, Songfa Zhang, Chunjiang Zhang i Jin-Woo Ahn. "Torque ripple reduction in direct torque controlled Brushless DC motor". W 2011 International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2011. http://dx.doi.org/10.1109/icems.2011.6073659.

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Sung, S. J., G. H. Jang, K. J. Kang i J. Y. Song. "Effect of Additional Harmonics of Driving Current on Torque Ripple and Unbalanced Magnetic Force of the BLDC Motors With Stator and Rotor Eccentricities". W ASME 2014 Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/isps2014-6913.

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This paper investigates the characteristics of the torque ripple and UMF in the BLDC motor with stator and rotor eccentricities due to additional harmonics of the driving current. Torque ripple can be divided into cogging torque due to the interaction between poles and slots, and commutation torque ripple due to driving current. Additional harmonics of driving current affect the characteristics of torque ripple. UMF is not generated in rotational symmetric motors with respect to pole, slot and winding configurations. However, stator and rotor eccentricities of BLDC motors generate additional harmonics on cogging torque and UMF. This research theoretically and numerically investigates the effects of driving current on the torque ripple and UMF of a BLDC motor with rotor and stator eccentricities. It shows that additional harmonics of the driving current, the stator eccentricity, and the rotor eccentricity independently affect the torque ripple. It also shows that additional harmonics of the driving current generate additional harmonics in UMF if BLDC motors have the stator or rotor eccentricities.
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Raporty organizacyjne na temat "Torque ripple"

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Zhong Ze, Zhen, Terry W. Martin i Juan C. Balda. Modeling and Nonlinear Control of a Switched Reluctance Motor to Minimize Torque Ripple. Part 3. Fort Belvoir, VA: Defense Technical Information Center, czerwiec 2000. http://dx.doi.org/10.21236/ada379419.

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Klepper, C. C., T. Uckan, P. K. Mioduszewski, R. T. McGrath i P. Hertout. Consideration of the magnetic field ripple in the design of plasma edge components for Tore Supra. Office of Scientific and Technical Information (OSTI), październik 1988. http://dx.doi.org/10.2172/6601545.

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Vallerani, Sara, Elizabeth Storer i Costanza Torre. Key Considerations: Equitable Engagement to Promote COVID-19 Vaccine Uptake among Undocumented Urban Migrants. SSHAP, maj 2022. http://dx.doi.org/10.19088/sshap.2022.013.

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This brief sets out key considerations linked to the promotion of COVID-19 vaccine uptake among undocumented migrants residing in Rome, Italy. We focus on strategies to equitably distribute COVID-19 vaccines. Evidence from Italy is applicable to other contexts where vaccine administration is tied to “vaccine passports” or “immunity passes”. Undocumented migrants have been considered as some of the “hardest to reach” groups to engage in COVID-19 vaccination outreach. This brief uses the term undocumented migrant or migrant for brevity, but we refer to people living without formal Italian citizenship, refugee status or right to remain in Italy. This brief explores the everyday context of undocumented migrants lives, and how experiences of the COVID-19 pandemic have exacerbated difficult conditions. It links emerging vulnerabilities to perceptions of vaccines, and we suggest that migrants orientate themselves towards the vaccines within frameworks which prioritise economic survival. In many cases, migrants have accepted a COVID-19 vaccine to access paid employment, yet this has often generated mistrust in the state and healthcare system. Accordingly, this brief considers how vaccines can be distributed equitably to boost trust and inclusion in the post-pandemic world. This brief draws primarily on the ethnographic evidence collected through interviews and observations with undocumented migrants in Rome, along with civil society representatives and health workers between December 2021 and January 2022. This brief was developed for SSHAP by Sara Vallerani (Rome Tre University), Elizabeth Storer (LSE) and Costanza Torre (LSE). It was reviewed by Santiago Ripoll (IDS, University of Sussex), with further reviews by Paolo Ruspini (Roma Tre University) and Eloisa Franchi (Université Paris Saclay, Pavia University). The research was funded through the British Academy COVID-19 Recovery: G7 Fund (COVG7210058). Research was based at the Firoz Lalji Institute for Africa, London School of Economics. The brief is the responsibility of SSHAP.
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Vallerani, Sara, Elizabeth Storer i Costanza Torre. Considerazioni chiave: equità e partecipazione nella promozione della vaccinazione per il covid-19 tra le persone razzializzate e senza documenti. SSHAP, maj 2022. http://dx.doi.org/10.19088/sshap.2022.025.

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Questo documento espone alcune considerazioni a proposito della promozione dei vaccini per il SARS-CoV-2 e delle strategie per garantirne un’equa distribuzione tra gli immigrati senza documenti residenti in Italia e, in particolare, a Roma. Quanto emerge dal caso italiano può essere in parte applicabile ad altri contesti in cui la somministrazione del vaccino è stata legata al dispositivo del “passaporto vaccinale”, ovvero il certificato COVID digitale dell'UE, in Italia Green Pass. Nell’organizzazione della campagna vaccinale alcune categorie sociali sono state identificate come “difficili da raggiungere” (hard to reach) e per cui è necessario immaginare interventi specifici.1 In questo testo si sceglie di parlare di persone razzializzate e illegalizzate poiché senza documenti per riferirsi a persone immigrate che non hanno cittadinanza, permesso di soggiorno e status di rifugiato. Questo documento esplora il contesto quotidiano delle vite delle persone illegalizzate e come l’esperienza della pandemia di COVID-19 abbia esacerbato le difficoltà che queste persone incontrano, 23 mettendo in luce il collegamento tra le vulnerabilità, consolidate ed emergenti, con la percezione dei vaccini. Si suggerisce come l’orientamento e la percezione dei vaccini si inseriscano all’interno dei contesti di vita delle persone, in cui molto spesso la priorità è data al sostentamento economico. In molti casi, l’accettazione della vaccinazione è motivata dalla necessità di continuare ad avere un lavoro retribuito piuttosto che a una preoccupazione connessa alla salute o a una fiducia nei confronti delle istituzioni sanitarie. Il seguente documento si pone l’obiettivo di esaminare come i vaccini possano essere distribuiti in modo equo e capace di aumentare la fiducia e i processi di inclusione nella società post-pandemica. Il testo si basa principalmente sulla ricerca etnografica e le testimonianze raccolte attraverso interviste e osservazioni con persone razzializzate e illegalizzate nella città di Roma, insieme a rappresentanti della società civile e operatori socio-sanitari tra dicembre 2021 e gennaio 2022. Questo documento è stato sviluppato per SSHAP da Sara Vallerani (Università di Roma Tre), Elizabeth Storer (LSE) e Costanza Torre (LSE). È stato revisionato da Santiago Ripoll (IDS, Università del Sussex), con ulteriori revisioni da parte di Paolo Ruspini (Università Roma Tre) ed Eloisa Franchi (Université Paris Saclay, Università di Pavia). La ricerca è stata finanziata dalla British Academy COVID-19 Recovery: G7 Fund (COVG7210058). La ricerca si è svolta presso il Firoz Lalji Institute for Africa, London School of Economics. La sintesi è di responsabilità di SSHAP.
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Drive modelling and performance estimation of IPM motor using SVPWM and Six-step Control Strategy. SAE International, kwiecień 2021. http://dx.doi.org/10.4271/2021-01-0775.

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This paper presents a comprehensive evaluation of the performance of an interior permanent magnet (IPM) traction motor drive, and analyses the impact of different modulation techniques. The most widely used modulation methods in traction motor drives are Space vector modulation (SVPWM), over-modulation, and six-step modulation have been implemented. A two-dimensional electromagnetic finite element model of the motor is co-simulated with a dynamic model of a field-oriented control (FOC) circuit. For accurate tuning of the current controllers, extended complex vector synchronous frame current regulators are employed. The DC-link voltage utilization, harmonics in the output waveforms, torque ripple, iron losses, and AC copper losses are calculated and compared with sinusoidal excitation. Overall, it is concluded that the selection of modulation technique is related to the operating condition and motor speed, and a smooth transition between different modulation techniques is essential to achieve a better performance.
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