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Dissertations / Theses on the topic 'Sensorless driving'
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1
Thongam, Jogendra Singh. "Commande de haute performance sans capteur d'une machine asynchrone = High performance sensorless induction motor drive." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.
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Soviš, Jiří. "Bezsnímačové řízení střídavých motorů na platformě STM32." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442463.
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The thesis is focused on the issue of sensorless vector control of a synchronous motor with permanent magnets in the low-speed range. In the first part, there is a brief description of the synchronous motor and the necessary transformations for the application of vector control. This is followed by the overview of sensorless methods for position estimation by injecting a high-frequency harmonic signal. The practical part is devoted to the implementation of a control algorithm to develop kit STM32NUCLEO-L476RG, which is preceded by the identification of all engine parameters. As part of the implementation, a structure including current, speed and position control was designed. The functionality and robustness of the settings have been successfully tested due to the different inertia and load.
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Pijáček, Ondřej. "Univerzální řídicí jednotka pro BLDC motory." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-240819.
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This thesis describes the design of universal control unit for BLDC motor powered from airplane power distribution system of 28 V capable of driving motor up to 10 A. The maximal engine power is about 250 W. Important prerequisite is possibility of driving various motor size without needs of changing wiring board using only the configuration in the auxiliary memory unit. To control different motors is enough one unit with one program without any way to interfere to the unit itself.
4
Shih, Meng-Han, and 石孟翰. "Sensorless Control for Brushless DC Motor Driving." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/rf44pt.
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碩士義守大學
電子工程學系
107
In recent years, green policies have been continuously implemented for achieve sustainable development, and one of the biggest reasons is the energy issue. It is harmful to our living environment whether from the use of the oil, electricity to the nuclear energy. To solve the energy problem is nothing more than developing green energy or starting from energy saving. Among them, direct current motors (DC motors) play an indispensable role in future trends. DC motors can be used for using service robots, aircrafts, scooters, etc. and therefore they have a vital position. At the current stage, DC motors are basically divided into brushed DC motors and brushless DC motors (BLDC motors). However, brushed DC motors have gradually not been used because their power consumption and structural problems are hard to be improved. Most of the BLDC motors are controlled by the basis of Hall sensors, but the BLDC motors loaded with Hall sensors have higher cost and lower environmental adaptability. Therefore, the sensorless BLDC motors controlled by the basis of motor back electromotive force (back EMF) are derived from the former. The measurement of back EMF usually requires the use of a filter circuit and a comparison circuit. While the microprocessor clock is gradually accelerating and the functions are gradually being integrated, the microprocessor can integrate the measuring circuit of the back EMF, thereby reducing the circuit cost and the risk. This paper will use HT32F52352 to collect all the back-EMF circuits, and adjust the speed, torque compensation, blocked rotor test and status display. We will compare various control methods to propose the most suitable method for microprocessor-controlled sensorless BLDC motors.
5
June-Horng, Ni, and 倪俊宏. "Servo Driving of Shaft-Sensorless Brushless DC Motor." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/20506959755221980029.
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碩士大同工學院
電機工程研究所
81
The servo control of a brushless DC motor without the shaft position sensor that the back electromotive force is trapezoidal is discussed in this thesis. It contains the motor starting procedure, steady-state drive, and position control method. The implementation of this system is made by the software which is based on the microprocessor and a few hardware. The motor starts and accelerates at stand still according to a set slope. The rotor position is determined by the terminal voltage, and then offer the motor commutation sequence. The motor speed is adjusted by the average motor voltage just like the chopper control of a DC motor. The experimental result show that it just need a short dulation to reach the speed command when a load is added to the motor. Also, a brief field-orientation control method for the rotor to stop at the desire position without adding any other hardware is presented. It can be shown that the rotor will stop at the exact position in a pair of N-S pole.
6
Chen, YuNian, and 陳昱年. "Design of Sensorless Bushless DC Motor and Driving Analysis." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/58557780632387492656.
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碩士國立清華大學
動力機械工程學系
92
In brushless DC motors (BLDCM), power electronic switches are employed to replace the commutation devices of conventional DC motors; whereas Hall-Effect sensors are used for detecting the rotor position to trigger the switches. Hence, mechanical noises and brush maintenance are reduced to further prolong the motors life. Efficiency, highly relevant to the magnetic circuit design, is one of the key design indexes in BLDCM such that magnetic circuit optimization is critical during the design stage. More recently, sensorless driving has been a design trend due to the limitation of high temperature environment and available space for the Hall sensors. In this thesis, a simplified 1-D magnetic circuit analysis was done for screening the basic design parameters of a slotless-type BLDCM for the model airplane application. Then, 2-D finite-element analysis for the static magnetic field has been conducted to establish the mathematical models of BLDCM with details in exploration of sensitivity study for the dimensions and materials characteristics. Finally, the complete dynamic performances have been simulated with the help of a multi-domain simulation package including the basic principles for the sensorless driving scheme to meet the design objectives.
7
Chern, Chun-Yu, and 陳俊宇. "Design and Implementation of High-Efficiency Driving Inverter for Sensorless DC Compressor." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/47685268627837784779.
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碩士國立中山大學
電機工程學系研究所
98
The DSP is used as the control kernel in this thesis, proposing a method of sensorless and variable speed driving with current feedback for the DC compressor. By detecting the back electromotive force signals directly, the information of rotor position can be obtained, the commutation process and the speed estimation can also be achieved. Combining the current feedback method, the sinusoidal commutation with sensorless control makes the motor lower speed ripple and higher rotating efficiency. The results show that the sinusoidal commutation approach has the advantages of higher efficiency and less speed ripple as compared to the approaches of traditional-step commutation and six-step with current feedback by experimental setting.
8
Chen, En-Ping, and 陳恩平. "An Advanced Sensorless Integrated Driving and Braking Control System for Electric Bikes." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/07201077129843689429.
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碩士國立中興大學
電機工程學系所
105
This thesis aims to develop a sensorless electromagnetic braking control system that uses Field Oriented Control (FOC) to integrate the driving and braking units into a single controller. With the application of anti-lock braking system (ABS), the braking effect can be maintained at the best performance. The control of drive and brake of permanent magnet brushless synchronous motors had been completed and applied to electric bikes. For the braking section, an electromagnetic reversely braking system having a larger braking force is developed which can change the switching state of the MOSFETs by alternating the duty cycle of pulse width modulation (PWM) to adjust the braking force. In addition, since the braking energy required for the electromagnetic braking system proposed here is related only to the back electromotive force (back-EMF) generated inside the motor, riders can determine the strength of the braking force by themselves or electric bike can be actually stopped at a higher speed for the safety design of driving. The proposed integrated sensorless driving and electromagnetic braking system have been practically realized, the results have been verified by experiments and the effect is good.
9
Li, Cheng Da, and 李承達. "Position detection and driving of the shaft-sensorless permanent magnet synchronous motor." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/22521358368017799518.
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Huang, Xin-Chung, and 黃信中. "Shaft Sensorless Control of Switched Reluctance Motor and Its Application in Driving Fans." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/u642jk.
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碩士國立臺北科技大學
電機工程系研究所
100
Switched reluctance motors (SRM) are running with reluctance force, the rotor and the stator are made of silicon steel. They have concentrated windings in stator slots, and do not require generating reluctance torque by a permanent magnet. There are advantages of ease for manufacturing, low cost and rugged. Therefore, they are particularly suitable for high-speed applications. In order to obtain good performance, the phase currents need to commutate with the rotor position. So we should install hall sensor, encoder or resolver to obtain rotor position information. However, if the motors are running in extreme environment such as high pressure, high temperature, wet or very high-speed operation, resulting in reliability problems of shaft position sensors. Therefore, in these applications should be no shaft position sensors to control the motors. We explored 8/6 poles SRM for the object and used a characteristics of peak phase currents method to detect the shaft position in high speed with the fan load. In addition to theoretical analysis, this paper also verifies the feasibility of this method by experiments.
11
Liao, Hung-Ju, and 廖鴻儒. "Design and Realization of Brushless DC Motor Sensorless Driving Technique for Underwater Vehicle Propulsion." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/55448855530990742472.
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碩士國立成功大學
系統及船舶機電工程學系碩博士班
94
Thruster motors of underwater vehicles often connect to driving circuits embedded in a water-sealed pressure case through water-sealed cables and connectors. Brushless DC motors (BLDCM) output commutation signals to the driving circuit by Hall effect sensors. This implies the requirement of a significant size and pin number for the connectors. Connectors for underwater applications are often expensive, and hence reduction of the pin number implies reduction of cost. Moreover, the weight of the cable, as well as the opening sizes for the connectors on the pressure case, can also be reduced. Thus, the pressure case can be more strengthened, and the water-proof capability can be improved. These advantages can be accomplished by adopting the sensorless driving technique. In the investigated sensorless driving technique, by regulating the cutoff frequencies for a low-pass filter, the rotational speed for switching to the commutation mode at the start-up stage can be decreased. Also, a discussion is made on what condition the motor can be switched from the start-up mode to the commutation mode. In the commutation mode, an on-line phase shifter is used to compensate the error of phase lag caused by the low-pass filter. Finally, in order to increase the speed ratio, a hardware phase-lead circuit with its programming is constructed to allow the current phase to lead the voltage phase and increase the motor speed range. Experiment is conducted to verify the proposed technique.
12
Liu, Shang-Ming, and 劉尚銘. "Using Sensorless Field Oriented Control Design in the Integrated Driving and Braking Structure of Electric Vehicles." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/87t557.
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碩士國立中興大學
電機工程學系所
107
Climate change has become an important issue in the world recently. People should find a balance between the industrial pollution and the ecological protection. Therefore, electric vehicle becomes a popular research topic. Most of the electric vehicles adopt regenerative brake since it reuses energy to increase the power endurance. This research proposed a sensorless integrated driving and braking motor control system which uses space vector pulse width module (SVPWM) to synthesize stator current. It calculates the position of rotor by detecting the variation of the stator current, and completes the control of close-loop. When the motor receive a brake command, digital signal controller (DSC) will change the inverter switching sequence to generate the reverse torque and magnetic field and then finish the driving and braking of field oriented control (FOC). The proposed braking system has powerful braking torque and short reacting time as compared to the regenerative brake and rheostatic brake. Based on the experimental results, this study compares the reacting time and effect of field oriented control (FOC) braking, sliding mode and short circuit braking used by permanent magnet synchronous motor (PMSM).
13
Cheng, Chien-Hsin, and 鄭建信. "Study of an Improved Sensorless Driving Method of Switched Reluctance Motors with External Rotor Using Impressed Voltage Pulse." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/ecu3gv.
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碩士國立成功大學
工程科學系碩博士班
92
The switched reluctance motors have been received more attention over the last two decades due to the advantage over other electronics motors such as simple construction, cost, fault-tolerant operation ability and flexibility of speed adjustment. Because of the structure of the SRM, the current reference of the SRM is dependent on turn-on and turn-off angle to maximize the torque. Therefore, the control of the SRM needs the knowledge of the shaft angle to generate the current command. But the shaft position sensors or encoders for shaft position information would produce the problem of additional cost, more space requirement and unreliability of inherent source. Therefore, the sensorless control system is developed extensively to eliminate the sensors. The thesis presents an improved impressed diagnostic pulse voltage method to estimate the rotor position of switched reluctance motor (SRM) with external rotor. The fundamental method of impressed diagnostic pulse voltage is to impress pulse voltage at the inactive phases of the SRM with external rotor. Because the variations of inductance are dependent on the rotor position and the characteristic current values produced from pulse voltage are dependent on the inductance, the rotor position can be inferred by observing the characteristic current value. If the inductance of the SRM doesn’t vary obviously, the characteristic current with noise influence may not provide correct information to result the failure of the sensorless position estimation method. Therefore, an improved impressed diagnostic pulse voltage method is presented to increase the variations of characteristic current and estimate rotor position. First, the structure, characteristic, operational principle and mathematical model of the SRM with external rotor are introduced. Then the improved impressed diagnostic pulse voltage method is utilized to implement the sensorless position estimation for commutation control. The structure of the experiment utilizes the digital signal processor T.I. TMS320VC33 DSP to implement the improved impressed diagnostic pulse voltage method. Both simulation and experiment results demonstrate the feasibility of the sensorless position estimation method.
14
Lin, Yi-Guang, and 林益光. "DEVELOPMENT OF A POSITION SENSORLESS PMSM DRIVEN WIND TURBINE EMULATOR." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/5uu734.
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碩士國立清華大學
電機工程學系所
105
This thesis develops a position sensorless permanent-magnet synchronous motor (PMSM) driven wind turbine emulator and performs its micro-grid connected operation. First, the basics concerning micro-grids, wind generators, turbines, PMSMs and switch-mode rectifiers (SMRs) are explored. Then a standard surface mounted PMSM (SPMSM) driven wind turbine emulator is established. The SPMSM drive can be operated in conventional turbine speed mode or specific wind turbine torque-speed mode. Various wind turbine torque-speed curves under different wind speeds can be faithfully emulated. Next, an observed extended-EMF (EEMF) based sensorless controlled SPMSM driven wind turbine emulator is developed. Through proper starting and dynamic controls, it possesses good driving characteristics being comparable to those of the standard one. For performing faithful loading test for the wind turbine emulator, an interior permanent-magnet synchronous generator (IPMSG) followed by a three-phase Vienna SMR is established. The maximum power point tracking (MPPT) function for the wind turbine emulator driven IPMSG with Vienna SMR is achieved using perturbation and observation (P&O) method. The commutation tuning to optimize the IPMSG developed power and the fault-tolerant operation of the Vienna SMR are also conducted. Additionally, to let the developed turbine emulator be powered from the utility grid with good power quality, a single-phase bridgeless boost SMR is designed and implemented. Then a complete SMR-fed wind turbine emulator driven IPMSG system is established and evaluated. Satisfactory operating characteristics are verified experimentally. Finally, the micro-grid powering application of the developed turbine emulator is presented. It is used to replace the wind generator in the studied micro-grid to express its effectiveness.
15
Liu, Bang-Yuan, and 劉邦元. "Force Sensorless Power Assist Control of Powered Wheelchair Driven by Rim Motor." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/gccz53.
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碩士國立臺灣大學
機械工程學研究所
107
The main objective of this research is to establish the power assist system for the proto-type powered wheelchair driven by rim motor. The main issue can be divided into two parts: improvement on accuracy of torque control in low speed region and design of power assist control sysytem. To achieve precise torque control, it is necessary to know accurate rotor position. However, the digital Hall-effect sensor used in the past research has a low resolution, which is difficult to meet the requirement. In addition, since the wheelchair is often operated in the low speed region, the speed estimated by the digital sensor will also contain large phase lag, which would reduce the bandwidth of the speed control loop. High-resolution encoders are generally used to deal with the above problems, but considering the higher cost, this paper proposes to use cheap linear Hall-effect sensors as a solution. In this application, because of the shape of the magnet using by the rim motor, the sensor signal contained large harmonic components and cannot be directly used for measurement, this paper proposes a specialized observer based on phase-locked loop, which includes adaptive filtering section. It can suppress the main harmonic components in the signal and achieve a more stable estimation. In regard to the power assisted control, this paper uses the disturbance observer instead of force sensors to estimate the human torque input, then through the technique of impedance control, the user could feel the appropriate impedance characteristics during the propulsion of the wheelchair. The objectives of the power assist control can be divided into two part: reduce the torque that the user must apply and extend the moving distance of the wheelchair. To achieve these goals, the powered wheel must have different impedance characteristic to the external torque disturbance. An identification algorithm is designed to determine whether the user is pushing the wheelchair, and accordingly determines the switching of the two impedance modes. The method of this paper is verified by simulation and its performance is proved by experiments.
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曾炫錡. "Sliding Mode Observer for Sensorless Control of Direct-driven Variable Speed Wind Generator." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/62277727723658596362.
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碩士國立交通大學
機械工程學系
100
Variable speed wind turbines can obtain more wind energy than fixed speed wind turbines in wind energy conversion system (WECS). To obtain maximum power from wind, variable speed wind turbines need be controlled by rotor speed controller as wind speed varied. Compare with large scale variable wind turbines with small scale variable wind turbines, the former are expensive and need maintenance, therefore, they usually install rotor speed sensor for speed control application. However, the latter are restricted to low cost due to market consideration and guarantee maintenance free for long time. Therefore, they preferred to adopt sensorless control strategy. In this thesis, rotor position and speed estimation is established via sliding mode observer (SMO). It is good at its robustness against parameter variation and it can be implemented in microprocessors or digital signal processors (DSP). Permanent magnet synchronous generator (PMSG) with peripheral circuits, gate driver and DSP are used for PMSG sensorless speed controller implementation in this thesis. Feasibility of SMO in WECS application is discussed by simulation and experimental results. Finally, Applicable range of SMO is analyzed by experimental data and wind turbine specification from market.
17
Huang, Jun-Hao, and 黃俊豪. "AN AIR-CONDITIONING SYSTEM WITH SENSORLESS PMSM DRIVEN COMPRESSOR AND FAN WITH COMMON SWITCH-MODE RECTIFIER FRONT-END." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/06761950890882651658.
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碩士國立清華大學
電機工程學系
99
This thesis develops a digital signal processor (DSP) based air-conditioning system, it consists of a sensorless permanent-magnet synchronous motor (PMSM) driven compressor, a sensorless PMSM driven cooling fan and a common switch mode rectifier (SMR) front end. The system compactness is achieved through power circuit modularization and common digital control environment. Besides, for making comparative driving performance evaluation, the standard PMSM drives for the compressor and the fan are also established. In the developed PMSM driven compressor, both high-frequency signal injection (HFI) and the extended-EMF (EEMF) sensorless control methods are applied and evaluated to comprehend their distinct merits and weak points. Then accordingly, a hybrid sensorless control scheme combining these two methods is developed to yield improved driving performance within wide speed range. In the developed control scheme, while the motor is started and driven under lower speed using HFI method, it is changed smoothly and operated using EEMF method as the speed is increased to a preset value. As to the PMSM driven cooling fan, the direct duty-ratio voltage-mode PWM scheme is adopted for the less stringent performance requirements. The standard and sensorless controls for sine-wave and square-wave PMSM drives are all studied and evaluated. In the proposed sensorless control schemes, only one-phase motor terminal voltage is sensed and properly signal processed. Better driving performance is further achieved via commutation advanced shift technique. Finally, a common front-end switch-mode rectifier (SMR) is formed to establish the boostable and well-regulated DC-link voltage for the followed two PMSM drives. Both the standard and the newly evolved bridgeless boost type SMRs are comparatively assessed. Owing to the limitation of pulse width modulation (PWM) channel number of the DSP TMS320F28335, the analog PWM circuit is employed as an alternative for realizing the front-end SMR.