Статті в журналах: "Tooth Coil windings"

1

Panteleev, S. V., A. B. Menzhinski, and A. N. Malashin. "Development of an analytical model for determining the magnetic leakage flux through the stator teeth of a synchronous electric machine with a fractional tooth winding." Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series 67, no. 1 (April 7, 2022): 75–85. http://dx.doi.org/10.29235/1561-8358-2022-67-1-75-85.

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As a result of the study of a two-dimensional finite element model of the magnetic field of a synchronous electric machine with fractional tooth windings, typical magnetic fluxes (fundamental, edge effect, scattering) in its magnetic system have been identified. The analysis of the degree of influence of magnetic fluxes of the edge effect and scattering on the magnitude of the main magnetic flux is carried out and equivalent circuits of the magnetic circuit of the studied synchronous electric machine with fractional tooth windings are constructed for different positions of the stator teeth relative to the rotor poles. An analytical model has been developed to determine the main magnetic flux through the coil of the working winding of a synchronous electric machine with fractional toothed windings. A feature of the proposed model is taking into account the dependence of the main magnetic flux through the coil of the working winding on the coordinate of the rotor position, the magnetic fluxes of the edge effect and scattering. The developed model allows solving the problem of quantitative determination of the value of the main magnetic flux through the coil of the working winding with high accuracy. In addition, the proposed model makes it possible to determine the influence of the main geometrical parameters of the magnetic circuit on the nature of the change in the main magnetic flux through the coil of the working winding with the least amount of time. The developed analytical model can be applied in the process of optimizing a synchronous electric machine with fractional tooth windings.

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2

Tang, Y., J. J. H. Paulides, and E. A. Lomonova. "Winding topologies of flux-switching motors for in-wheel traction." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 34, no. 1 (January 5, 2015): 32–45. http://dx.doi.org/10.1108/compel-11-2013-0377.

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Purpose – The purpose of this paper is to investigate winding topologies for flux-switching motors (FSMs) with various segment-tooth combinations and different excitation methods. Design/methodology/approach – For the ac winding of FSM, two winding topologies, namely the concentrated winding and the distributed winding, are compared in terms of the winding factor and efficiency. For the field winding of dc-excited FSM (DCEFSM), another two winding topologies, namely the lap winding and the toroidal winding, are compared in terms of effective coil area, end-winding length, and thermal conditions. Analytical derivation is used for the general winding factor calculation. The calculation results are validated using finite element analysis. Findings – Winding factors can be used as an indication of winding efficiency for FSMs in the same manner as done for synchronous motors. For FSMs with concentrated windings, the winding factor increases when the rotor tooth number approaches a multiple of the stator segment number. For FSMs with certain segment-tooth combinations, e.g. 6/8, the theoretical maximum winding factor can be achieved by implementing distributed windings. Furthermore, the toroidal winding can be an efficient winding topology for DCEFSMs with large stator diameter and small stack length. Research limitations/implications – This work can be continued with investigating the variation of reluctance torque with respect to different segment-tooth combinations of FSM. Originality/value – This paper proposes a general method to calculate the winding factor of FSMs using only the phase number, the stator segment number, the rotor tooth number, and the skew angle. Using this method, a table of winding factors of FSMs with different segment-tooth combinations is provided. Principle of design of FSMs with high-winding factors are hence concluded. This paper also proposed the implementation of distributed windings for FSM with certain segment-tooth combinations, e.g. 6/8, by which means a theoretical maximum winding factor is achieved. In addition, different winding topologies for the field winding of DCEFSM are also investigated.

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3

Wohlers, C., P. Juris, S. Kabelac, and B. Ponick. "Design and direct liquid cooling of tooth-coil windings." Electrical Engineering 100, no. 4 (July 2, 2018): 2299–308. http://dx.doi.org/10.1007/s00202-018-0704-x.

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4

Acquaviva, Alessandro, Stefan Skoog, Emma Grunditz, and Torbjörn Thiringer. "Electromagnetic and Calorimetric Validation of a Direct Oil Cooled Tooth Coil Winding PM Machine for Traction Application." Energies 13, no. 13 (June 30, 2020): 3339. http://dx.doi.org/10.3390/en13133339.

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Tooth coil winding machines offer a low cost manufacturing process, high efficiency and high power density, making these attractive for traction applications. Using direct oil cooling in combination with tooth coil windings is an effective way of reaching higher power densities compared to an external cooling jacket. In this paper, the validation of the electromagnetic design for an automotive 600 V, 50 kW tooth coil winding traction machine is presented. The design process is a combination of an analytical sizing process and FEA optimization. It is shown that removing iron in the stator yoke for cooling channels does not affect electromagnetic performance significantly. In a previous publication, the machine is shown to be thermally capable of 25 A/mm 2 (105 Nm) continuously, and 35 A/mm 2 (140 Nm) during a 10 s peak with 6 l/min oil cooling. In this paper, inductance, torque and back EMF are measured and compared with FEA results showing very good agreement with the numerical design. Furthermore, the efficiency of the machine is validated by direct loss measurements, using a custom built calorimetric set-up in six operating points with an agreement within 0.9 units of percent between FEA and measured results.

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5

Ge, X., Z. Q. Zhu, R. Ren, and J. T. Chen. "A Novel Variable Reluctance Resolver with Nonoverlapping Tooth–Coil Windings." IEEE Transactions on Energy Conversion 30, no. 2 (June 2015): 784–94. http://dx.doi.org/10.1109/tec.2014.2377214.

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6

Lee, Ho-Young, Seung-Young Yoon, Soon-O. Kwon, Jin-Yeong Shin, Soo-Hwan Park, and Myung-Seop Lim. "A Study on a Slotless Brushless DC Motor with Toroidal Winding." Processes 9, no. 11 (October 21, 2021): 1881. http://dx.doi.org/10.3390/pr9111881.

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In this study we developed a brushless DC (BLDC) slotless motor with toroidal winding. The proposed toroidal winding is a method of winding a coil around a ring-type stator yoke in the circumferential direction. As there is no need for a slot or tooth structure, it can be designed with a slotless motor structure that is advantageous for vibration and noise. The basic principle of operation and motor characteristics of a slotless motor with toroidal winding were explained using an analytical method and finite element analysis (FEA). Further, the air gap flux density, winding factor, and back electromotive force (EMF) for changes in the winding angle and number of coil turns were calculated using the analytical method and compared with the FEA results. Finally, the resistance, back EMF, cogging torque, and performance of the prototype were measured and compared with the FEA results. The results show that the air gap flux density and winding factor were approximately the same with an error of <2%, while the back EMF had an error of ~10% from the analysis result. Thus, the proposed slotless motor provides a basic design for conveniently manufacturing brushless DC (BLDC) slotless motors with toroidal windings.

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7

Lindh, Pia, Juho Montonen, Paula Immonen, Juan A. Tapia, and Juha Pyrhonen. "Design of a Traction Motor With Tooth-Coil Windings and Embedded Magnets." IEEE Transactions on Industrial Electronics 61, no. 8 (August 2014): 4306–14. http://dx.doi.org/10.1109/tie.2013.2279126.

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8

Baudart, François, Laetitia de Viron, Sergio Ivanov, and Francis Labrique. "Modular control of fault-tolerant permanent magnet synchronous machines with tooth-coil windings." European Journal of Electrical Engineering 16, no. 2 (April 30, 2013): 185–220. http://dx.doi.org/10.3166/ejee.16.185-220.

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9

Qu, Huan, Han Yang, and Zi Qiang Zhu. "Analysis of Stator-Slot Circumferentially Magnetized PM Machines with Full-Pitched Windings." World Electric Vehicle Journal 12, no. 1 (February 23, 2021): 33. http://dx.doi.org/10.3390/wevj12010033.

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Stator-slot circumferentially magnetized PM machines (SSCMPMMs) have high fault-tolerant capability. In this paper, the SSCMPMMs with full-pitched windings and different stator slot/rotor pole numbers are investigated, together with the influence of key geometric parameters. It shows that the 12 stator-slots 7 rotor-poles (12S7R) machine delivers the highest torque. It is then compared with the SSCMPMM with tooth-coil windings. The results show that when they have the same active length, the 12S7R machine delivers significantly higher torque and higher efficiency. Furthermore, when the machine length is over around 140 mm, the 12S7R machine is more advantageous in producing high torque and high efficiency. A prototype is manufactured and tested to validate the theoretical analyses.

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10

Diana, Michela, Riccardo Ruffo, and Paolo Guglielmi. "Low torque ripple tooth coil windings multi-3-phase machines: design considerations and validation." IET Electric Power Applications 14, no. 2 (February 1, 2020): 262–73. http://dx.doi.org/10.1049/iet-epa.2019.0178.

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11

Schmidt, E., and M. Sušić. "Finite element analysis of permanent magnet synchronous machines with fractional slot tooth coil windings." e & i Elektrotechnik und Informationstechnik 128, no. 3 (March 2011): 86–94. http://dx.doi.org/10.1007/s00502-011-0812-z.

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12

Deusinger, Björn, and Andreas Binder. "Evaluation of a newly proposed indirect efficiency determination method for permanent magnet synchronous machines." e & i Elektrotechnik und Informationstechnik 139, no. 2 (March 16, 2022): 155–66. http://dx.doi.org/10.1007/s00502-022-01004-5.

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AbstractThis paper evaluates the applicability of a newly proposed method for the indirect efficiency determination of permanent magnet synchronous machines by measuring individual losses. Similar methods are well-known and standardized for other kinds of electrical machines, but for permanent magnet synchronous machines, only the direct measurement of input and output power is standardized for efficiency determination according to IEC 60034-2‑1. Measurements and finite element simulations are carried out for four selected test machines with a rated power range between 45 kW and 90 kW and with different stator and rotor topologies. It is shown that the proposed method is well applicable for permanent magnet synchronous machines with a distributed integer-slot stator winding. For machine designs with more rotor losses such as motors with tooth coil windings and open stator slots, larger deviations between the direct and indirect efficiency values of up to one percentage point are determined at rated load conditions.

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13

Lindh, Pia, Toomas Vaimann, Ants Kallaste, Juha Pyrhönen, Dmitri Vinnikov, and Ville Naumanen. "Influence of slot wedge material on permanent magnet losses in a traction motor with tooth coil windings." International Journal of Applied Electromagnetics and Mechanics 42, no. 2 (March 5, 2013): 227–36. http://dx.doi.org/10.3233/jae-131659.

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14

Schmidt, Erich. "Calculation of electromagnetic quantities of permanent magnet synchronous machines with tooth coil windings using finite elements and frozen permeabilities." e & i Elektrotechnik und Informationstechnik 132, no. 1 (February 2015): 11–17. http://dx.doi.org/10.1007/s00502-014-0280-3.

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15

Orlova, S., V. Pugachov, and R. Otankis. "Active Zone of Permanent Magnet Synchronous Machine with a Non-Overlapping Concentrated Winding." Latvian Journal of Physics and Technical Sciences 55, no. 4 (August 1, 2018): 3–12. http://dx.doi.org/10.2478/lpts-2018-0024.

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Abstract The research is devoted to the investigation of NdFeB permanent magnet (PM) based synchronous generators with non-overlapping concentrated windings. The rotor of such a generator has 10 pole pairs (PMs), which is dictated by the nominal voltage frequency (f=50 Hz) and the rotational speed (n=300 RPM). Comparison is made for four generators with three-phase winding coils and stator tooth numbers 18, 21, 24 and 27.

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16

Tikhonova, Ol’ga, Igor’ Malygin, and Anatoliy Plastun. "THE EQUIVALENT CIRCUIT PARAMETERS CALCULATION OF INDUCTION MOTORS WITH RING WINDINGS." Bulletin of the South Ural State University series "Power Engineering" 22, no. 1 (March 2022): 21–35. http://dx.doi.org/10.14529/power220103.

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Induction motors with ring windings (IMRW) are designed for the processing of nuclear waste. The sta-tor winding coils are covered with ceramic insulation to allow for long-term operation in conditions of increased radiation. The stator coils are ring shaped, in order to reduce the bend angle. The stator has a specific design consisting of tooth tips located around the axis of rotation and tooth cores placed over the tooth tips in a spiral. The first IMRW prototype was manufactured by UrFU together with “Uralelectromash”. It was designed to the same diameters as an induction motor of a classical design with a power P = 2.2 kW, with a synchronous rotation speed n = 1000 rpm. The fundamentally new ar-mature design involves the search for new solutions for determining machine parameters, such as inductances, electro-magnetic torques. The article discusses a method of equivalent circuit parameter calculation for IMRW using the “ANSYS Maxwell” in 3D mode. In order to determine stator winding leakage inductances, a static analysis of the model with the ro-tor removed was used. Mutual inductance is defined as the difference between stator winding phase impedance and leak-age inductance. The active resistance of the magnetizing circuit and the impedance of the motor can be determined using the IMRW no-load and short-circuit characteristics obtained in ANSYS Maxwell. The paper also provides an example of calculating the mechanical characteristics of a motor using the analytical method (AM).This involves the use of equivalent circuit parameters, and the finite element method (FEM). The use of FEM for calculating the mechanical characteristics implies the analysis of IMRW in a dynamic mode. This allows the electromagnetic torque to be determined at a user-specified rotor speed. In conclusion, a comparative analysis of the parameters of a classic engine and IMRW engine, of the same size, is given. Recommendations are given for further improvement of the design of IMRW engines.

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17

Mohd Jamil, Mohd Luqman, Syed Muhammad S. A. Al-Habshi, Md Nazri Othman, and Tole Sutikno. "Performance of Fractional-Slot Winding PM Machines due to Un-even Coil Turns and Asymmetric Design of Stator Teeth." International Journal of Power Electronics and Drive Systems (IJPEDS) 6, no. 4 (December 1, 2015): 853. http://dx.doi.org/10.11591/ijpeds.v6.i4.pp853-859.

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PM machines in which slot number and pole number combination differs by one have to be configured with asymmetric winding pattern in order to maximize it back-emf performance. However, this asymmetric winding configuration inherently results an unwanted Unabalanced Magnetic Force (UMF). Investigations of electromagnetic performance of fractional-slot asymmetric winding PM machines using 2-D Finite-Element Analysis are presented. The investigations are mainly driven by the effort of minimizing the UMF. By employing techniques such as non-uniform number of coil turns in every tooth and asymmetric design of stator tooth, the UMF are expected can be minimized. The investigations show that the radial component of UMF has greater effect than the tangential component on the UMF itself. In all proposed techniques, a slight reduction of machine torque performance is inevitable.

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18

Ma, Qingqing, Baoming Ge, Daqiang Bi, Fernando J.T.E. Ferreira, and Aníbal T. de Almeida. "A new switched reluctance motor with distributed winding." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 33, no. 6 (October 28, 2014): 2158–79. http://dx.doi.org/10.1108/compel-08-2013-0275.

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Purpose – The purpose of this paper is to propose a new three-phase switched reluctance motor (SRM), and achieve high-torque and low-cost. This new SRM's winding configuration uses the double-layer distributed windings, which is different from the conventional SRM's single tooth coils. Design/methodology/approach – The operating principle of new SRM is analyzed, and the voltage equation and the generated torque are deduced. Finite element method (FEM) and finite element circuit coupled method are utilized to evaluate the new motor's operating performances. The two dimensional (2D) frequency response analysis model is employed in the FEM model. Based on the 2D frequency response analysis model, the magnetic field distribution, self-inductance, and mutual-inductance for the new SRM are analyzed in detail. A co-simulation model using FE analysis package and Matlab-Simulink is proposed to simulate the new SRM drive. The simulated and experimental results verify the new SRM. Findings – For the new SRM with double-layer distributed windings, a co-simulation method is proposed to analyze its characteristics. The new SRM presents lower torque ripple coefficient and generates larger torque than the conventional SRM, with three-wire and standard full bridge power converter, rather than six-wire and asymmetric half-bridge converter for conventional SRM. Originality/value – This paper proposes a new SRM with the double-layer distributed windings driven by a standard full bridge inverter. In order to calculate dynamic characteristics of the new SRM, a co-simulation method using FEM and Simulink is proposed to simulate the new SRM drive, where the power inverter and the current chopping control algorithm are implemented.

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19

SMIRNOV, Alexander Yu. "Design of magnetoelectric machines with annular armature winding." Elektrichestvo 2, no. 2 (2021): 60–65. http://dx.doi.org/10.24160/0013-5380-2021-2-60-65.

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Design strategy of synchronous machines with annular armature winding and rotor placed PMs is discussing, which can provide advantages instead of general ones with drum armature winding in two-pole machine magnetic systems with developed outer diameter. Tie derivations between of stator bore volume, torque and electromagnetic loads via Magnetic constant (Arnold’s), equations for linear load, for PMs magnetic conductivity in dependence from rated parameters of magnetically hard material, for phase’s EMF. Slots filling by areas of rectangular wires and of coil and major insulation are taking into consideration. Numerical testing, executed via torque-angle (static) curves calculation by means of finite-element method, shows that the motors, that designed with appropriated torque multiplicity are satisfying to initial technical requirements, that is confirms methodic validity. During numerical testing tooth harmonics, provided by stator tooth structure, influence was evaluating and was given recommendations for reduction this influence. The results of power and torque characteristics comparison with traditional machine supplied by drum winding represented, which confirms capability of declared advantages receipt.

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20

Petrell, Daniel, Gerhard Hirt, Stefan Börzel, Waldemar Schäfer, and Jens Kattner. "Einzelzahnspulen für leistungsstarke Motoren/Single tooth coils for powerful motors." wt Werkstattstechnik online 111, no. 10 (2021): 718–22. http://dx.doi.org/10.37544/1436-4980-2021-10-64.

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Zunehmend steigende Anforderungen an die Effizienz und Leistung elektrischer Maschinen für den Einsatz in Fahrzeugen machen neue Herstellungsverfahren für Statorwicklungen notwendig. Daher wurde in Zusammenarbeit mit der RWTH Aachen University sowie den beiden Firmen Schaeffler und Breuckmann ein serientaugliches Herstellungsverfahren entwickelt, mit dem querschnittsvariable Einzelzahnspulen für den Einsatz in elektrischen Motoren mit hoher Drehmomentdichte hergestellt werden können.   Increasingly high demands on the efficiency and performance of electrical machines for use in vehicles require new manufacturing processes for stator windings. Therefore, RWTH Aachen University collabaorated with the companies Schaeffler and Breuckmann to develop a manufacturing process suitable for series production, allowing for manufacturing variable-cross-section single-tooth coils for use in electric motors with high torque density.

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21

Nguyen, Quoc Hung, Bao Tri Diep, Duy Hung Nguyen, Van Bien Nguyen, Van Bo Vu, and Qui Duyen Do. "Development of a novel MR clutch featuring tooth-shaped disc." Vietnam Journal of Mechanics 43, no. 3 (September 30, 2021): 265–76. http://dx.doi.org/10.15625/0866-7136/15879.

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In this research, we focus on development of a new configuration of magneto-rheological fluid (MRF) based clutch (MRC) featuring a tooth-shaped disc with multiple teeth acting as multiple magnetic poles of the clutch. The tooth-shaped disc is placed in a clutch housing composed of the left housing and the right housing. The inner face the housing also has tooth shaped features mating with the teeth of the disc through the working MRF. Excitation coils are placed directly on stationary winding cores placed on both side of the clutch housing. An air gap of 0.3 mm is left between the housing and the winding cores to ensure the housing can freely rotate against the winding cores. After the introductory part, configuration of the MRC is introduced and the transmitted torque of the MRC is derived. An optimization process to minimize the overall volume of the proposed clutch, which can generate a required maximum braking torque, is then conducted. The optimal results show that the overall volume of the proposed MRC is significantly reduced compared to a referenced conventional MRC (0.159 m3 vs. 0.295 m3). A prototype of the proposed MRC is fabricated for experimental works and good agreement between the experimental results and simulated ones is archived.

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22

Veg, Lukáš, Jan Kaska, Martin Skalický, and Roman Pechánek. "A Complex Study of Stator Tooth-Coil Winding Thermal Models for PM Synchronous Motors Used in Electric Vehicle Applications." Energies 14, no. 9 (April 23, 2021): 2395. http://dx.doi.org/10.3390/en14092395.

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The operational reliability and high efficiency of modern electrical machines depend on the ability to transfer heat in the construction parts of the machine. Therefore, many authors study various thermal models and work on the development of effective heat dissipation. New insights and methods lead to improved techniques for the thermal design of electrical machines. This paper presents an experimentally validated thermal model of a permanent magnet synchronous motor (PMSM) with an improved slot winding model. It also deals with various approaches to homogenization and equivalent material properties of a tooth-coil winding sub-model. First, an algorithm for building a lumped-parameter thermal network (LPTN) of PMSM is described and its properties and problems are discussed. Subsequently, a sub-model of a slot with a winding based on the finite element method (FEM) is introduced. This sub-model is able to generate different conductor distributions based on probabilistic methods for a specified fill factor. This allows the verification of various homogenization approaches and at the same time it is a tool that automatically calculates thermal resistances for the LPTN.

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23

May, H., R. Palka, P. Paplicki, S. Szkolny, and W. R. Canders. "Modified concept of permanent magnet excited synchronous machines with improved high-speed features." Archives of Electrical Engineering 60, no. 4 (December 1, 2011): 531–40. http://dx.doi.org/10.2478/v10171-011-0043-2.

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Modified concept of permanent magnet excited synchronous machines with improved high-speed features Permanent magnet (PM) excited synchronous machines used in modern drives for electro-mobiles suffer in high speed regions from the limited battery-voltage. The field weakening requires designing machines with reduced power conversion properties or increasing the size of the power converter. A new concept of such a machine features PM excitation, single-tooth winding and an additional circumferential excitation coil fixed on the stator in the axial center of the machine. By the appropriate feeding of this coil, the amplitude of the voltage effective excitation field can be varied from zero to values above those of the conventional PM-machines. The capability of reducing the excitation field to zero is an important safety aspect in case of failing of the feeding convertor.

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Ismagilov, Flur, Vyacheslav Vavilov, Denis Gusakov, and Nikolai Tarasov. "Permanent Magnet Generator with the Tooth-Coil Winding and Saturation Magnetization of the Magnetic Core." International Review of Aerospace Engineering (IREASE) 10, no. 4 (August 31, 2017): 250. http://dx.doi.org/10.15866/irease.v10i4.12844.

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25

Madariaga, Carlos, Werner Jara, Juan A. Tapia, Juha Pyrhonen, Pia Lindh, and Javier A. Riedemann. "Closed-Form Solution for the Slot Leakage Inductance of Tooth-Coil-Winding Permanent Magnet Machines." IEEE Transactions on Energy Conversion 34, no. 3 (September 2019): 1572–80. http://dx.doi.org/10.1109/tec.2019.2908053.

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26

Hoffer, Alvaro E., Ilya Petrov, Juha J. Pyrhonen, Juan A. Tapia, and Gerd Bramerdorfer. "Analysis of a Tooth-Coil Winding Permanent-Magnet Synchronous Machine With an Unequal Teeth Width." IEEE Access 8 (2020): 71512–24. http://dx.doi.org/10.1109/access.2020.2987872.

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27

Jang, G. H., and D. K. Lieu. "Modeling of the influence of coil winding pattern on tooth forces in brushless DC motors." IEEE Transactions on Magnetics 30, no. 6 (1994): 4290–92. http://dx.doi.org/10.1109/20.334064.

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28

Giulii Capponi, Fabio, Giulio De Donato, Giovanni Antonio Rivellini, and Federico Caricchi. "Fractional-Slot Concentrated-Winding Axial-Flux Permanent-Magnet Machine With Tooth-Wound Coils." IEEE Transactions on Industry Applications 50, no. 4 (July 2014): 2446–57. http://dx.doi.org/10.1109/tia.2013.2295432.

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29

Madariaga, Carlos, Werner Jara, Danilo Riquelme, Gerd Bramerdorfer, Juan A. Tapia, and Javier Riedemann. "Impact of Tolerances on the Cogging Torque of Tooth-Coil-Winding PMSMs with Modular Stator Core by Means of Efficient Superposition Technique." Electronics 9, no. 10 (September 29, 2020): 1594. http://dx.doi.org/10.3390/electronics9101594.

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Анотація:

This paper analyzes the impact of manufacturing tolerances on the cogging torque of a 24-slot 28-pole tooth-coil-winding permanent magnet synchronous machine with a modular stator core (TCW-MPMSM). Dimensional tolerances and asymmetries associated with the modular topology are studied by means of finite element simulations in order to identify key parameters that increase the cogging torque above the expected values of a faultless machine. Among five selected dimensional parameters, it was found that angular displacement, radial displacement, and tooth–tip width deviations of the stator segments have the most significant impact on the cogging torque. Considering these three key parameters, a full-range tolerance analysis is carried out by means of a proposed superposition-based approach, evaluating all possible combinations of typical deviation values. It is concluded that the cogging torque increment, generated by tolerances, is relatively independent of the faultless tooth–tip width of the stator segments and the arc-to-pole ratio. Robustness of the TCW-MPMSM, regarding cogging torque generation, depends on both the tightness of the tolerances handled in the manufacturing process and the rated cogging torque: the lower the cogging torque of the ideal machine, the less robust is the machine and, therefore, manufacturing imperfections will be required to be tightened.

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30

Liu, Chengjun, Ming QI, and Meng Zhao. "Analysis of Novel Variable Reluctance Resolver with Asymmetric Teeth on the Stator." Mathematical Problems in Engineering 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/958747.

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The variable reluctance (VR) resolver is usually used to measure the shaft angle of motor. A novel VR resolver with asymmetric teeth on the stator is proposed to achieve the minimal number of active teeth and eliminate the amplitude imbalance of the output voltages of SIN and COS coils by bringing the fifth compensating tooth. The structure and the total output voltages of signal windings are explicated theoretically in detail. The topology of such a machine just requires 2D finite element analysis (FEA) to accurately predict the machine performance. Results of FEA and principle of VR resolver with asymmetric teeth are in good agreement, and several special relevant problems are studied. Finally, experimental results validate the theoretical analysis and FEA of the proposed VR resolver.

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Wu, Di, Z. Q. Zhu, and Robert Nilssen. "Development of a Segmented Linear Variable Flux Reluctance Motor with DC-Field Coil." Applied Mechanics and Materials 416-417 (September 2013): 203–8. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.203.

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This paper proposes a new type of linear motor based on the concept of variable flux reluctance motor (VFRM). By adopting segmented primary stator, the segmented linear VFRM (SLVFRM) can eliminate asymmetry between phases due to end-effect. Meanwhile, multi-phase SLVFRM of any number of phases can be obtained by adjusting number of segments directly. The stator/mover tooth pitch combination and segments arrangement rules are also illustrated. An optimized 3-phase SLVFRM is analyzed by finite element analysis, with focus on characteristics such as cogging force, back-EMF and winding inductances. Further, both brushless AC (BLAC) and brushless DC (BLDC) drive for SLVFRM are investigated. Besides much smaller force ripple, BLDC drive can obtain higher average force at same RMS current due to trapezoidal back-EMF. The force characteristicwith variousAC and DC currents and current angles are also investigated in the paper, and it shows that SLVFRM has negligible reluctance force while keeping the same AC and DC currents is optimal for maximum efficiency operation under a fixed copper loss.

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32

Rahmani Fard, Javad, and Mohammad Ardebili. "Design and prototyping of the novel axial flux-switching permanent-magnet motor." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 37, no. 2 (March 5, 2018): 890–910. http://dx.doi.org/10.1108/compel-05-2017-0213.

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PurposeThe purpose of this paper is to propose a novel axial field flux-switching machine with sandwiched permanent magnets. It is one of the most efficient machines which is appropriate for high-torque and low-speed direct-drive applications. The proposed model is equipped with an advanced phase-group concentrated-coil winding to obtain a unity displacement winding factor. Two configurations of the proposed motors with 6-stator-slot (S)/10-rotor-pole (P) and 12S/19P are investigated. These two structures are compared with optimized a conventional axial-field flux-switching permanent-magnet (CAFFSPM) machine. Unity displacement winding factor increases the back-EMF and electromagnetic torque. Moreover, the prototype 12S/19P motor is built to verify the design. Design/methodology/approachThe torque equation is obtained and the dimensions of the two proposed motors are determined. Some specific design issues, including the stator/rotor pole sandwiching pole angle, the stator tooth angle and the rotor pole angle have been optimized to minimize the cogging torque while maintaining the high torque density by means of response surface methodology (RSM) and 3-D finite element model of the machine. FindingsTo improve the performance, especially at high torque density, low cogging torque and high level of fault-tolerant capability, the 12S/19P axial field flux-switching sandwiched permanent-magnet (AFFSSPM) motor is proposed. Based on the optimized design, a prototype of the 12S/19P AFFSSPM motor is fabricated and tested. It is found that the experimental results validate the 3-D finite element method (FEM) simulation results. Originality/valueThe AFFSSPM motor is one of the most efficient motors, but the 12S/19P AFFSSPM motor with sandwiched permanent magnet and unity displacement winding factor has not been specially reported to date. Thus, in this paper, the authors report on optimal design of a novel axial flux-switching sandwiched permanent-magnet machine for electric vehicles and fabricate a prototype of the 12S/19P AFFSSPM motor.

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Farong, Kou, Li Yangkang, Chen Chen, and Hong Feng. "Thrust Ripple Force Minimization and Efficiency Analysis of Electromagnetic Actuator on Active Suspension." Shock and Vibration 2020 (March 10, 2020): 1–13. http://dx.doi.org/10.1155/2020/2572534.

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A novel electromagnetic actuator for active suspension is designed on an in-wheel motor electric vehicle in this paper. Aiming at reducing thrust ripple force and improving stability of the actuator, a method of calculating the optimum slot width and optimizing edge radian of end tooth is proposed. Firstly, a finite element model (FEM) of the actuator is modeled, and the correctness of FEM is verified through comparisons of simulation results and analytical ones, including counterelectromotive force of coil winding and force characteristic test of the actuator. Based on the FEM, the influence of slot width on electromagnetic thrust and total harmonic distortion (THD) is analyzed, and the slot width is improved. The side effect of the actuator is considered. By improving the edge radian, the fluctuation of the cogging force and thrust ripple is reduced. In addition, output efficiency and energy feed efficiency of the actuator after reducing thrust ripple are studied. The results show the minimum THD is 4.2%, which is obtained at the slot width 4.3 mm, and thrust ripple is 36.5 N. When the edge radian is 60°, the thrust ripple decreases to only 15.7 N, which is reduced by 57.0%. The maximum output efficiency and energy feedback efficiency of the actuator are 87.5% and 27.1%, respectively. Finally, according to actuator characteristic tests of two working modes, it is concluded that the maximum energy feedback efficiency is 25.6%. The input current and current frequency should be gradually increased with the increase of suspension speed under active mode, and the maximum output efficiency is 80.2%. The test results are basically consistent with the FEM analysis values, which verify the correctness of the FEM analysis.

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Saneie, Hamid, and Zahra Nasiri-Gheidari. "Generalized Non-overlapping Tooth Coil Winding Method for Variable Reluctance Resolvers." IEEE Transactions on Industrial Electronics, 2021, 1. http://dx.doi.org/10.1109/tie.2021.3084157.

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Acquaviva, Alessandro, Stefan Skoog, and Torbjorn Thiringer. "Design and Verification of In-slot Oil-Cooled Tooth Coil Winding PM Machine for Traction Application." IEEE Transactions on Industrial Electronics, 2020, 1. http://dx.doi.org/10.1109/tie.2020.2985009.

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