Cogging torque reduction in permanent magnet flux-switching machines by rotor teeth axial pairing

Wang, Y.; Jin, Meng-Jia; Fei, W.Z.; Shen, Jian‐Xin

doi:10.1049/iet-epa.2009.0205

Cited by 67 publications

(27 citation statements)

References 10 publications

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“…Since the FEA software used for predicting the electromagnetic performance in the paper has no periodical mesh function, the mesh is rough, and hence, the cogging torques are not periodical. However, as analyzed in [18], the cogging torque waveform in the FSPM machine is periodical, as shown in Equation (7) below, where C cog is the electrical degree of one cogging torque cycle and N cog is the least common multiple of stator slots and rotor poles. This is also true for the interior PM (IPM) machine used in the DMP [19].…”

Section: Cogging Torquementioning

confidence: 99%

Investigation of a Co-Axial Dual-Mechanical Ports Flux-Switching Permanent Magnet Machine for Hybrid Electric Vehicles

Wang

Zhou

2015

Energies

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Abstract:In this paper, a co-axial dual-mechanical ports flux-switching permanent magnet (CADMP-FSPM) machine for hybrid electric vehicles (HEVs) is proposed and investigated, which is comprised of two conventional co-axial FSPM machines, namely one high-speed inner rotor machine and one low-speed outer rotor machine and a non-magnetic ring sandwiched in between. Firstly, the topology and operation principle of the CADMP-FSPM machine are introduced; secondly, the control system of the proposed electronically-controlled continuously-variable transmission (E-CVT) system is given; thirdly, the key design specifications of the CADMP-FSPM machine are determined based on a conventional dual-mechanical ports (DMP) machine with a wound inner rotor. Fourthly, the performances of the CADMP-FSPM machine and the normal DMP machine under the same overall volume are compared, and the results indicate that the CADMP-FSPM machine has advantages over the conventional DMP machine in the elimination of brushes and slip rings, improved thermal dissipation conditions for the inner rotor, direct-driven operation, more flexible modes, lower cogging torque and torque ripple, lower total harmonic distortion (THD) values of phase PM flux linkage and phase electro-motive force (EMF), higher torque output capability and is suitable for the E-CVT systems. Finally, the pros and cons of the CADMP-FSPM machine are highlighted. This paper lays a theoretical foundation for further research on CADMP-FSPM machines used for HEVs.

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Section: Cogging Torquementioning

confidence: 99%

Investigation of a Co-Axial Dual-Mechanical Ports Flux-Switching Permanent Magnet Machine for Hybrid Electric Vehicles

Wang

Zhou

2015

Energies

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“…Cogging torque, a periodic oscillation torque, is due to energy variation within a motor as the rotor turns, even if there is no current in the windings [6,7], with the tendency of the rotor field to align with the stator poles. The combination of cogging torque and torque ripple causes unstable torque pulsation [8,9], which results in additional and undesired vibration and noise during machine operation [10].…”

Section: Open Accessmentioning

confidence: 99%

A Novel Cogging Torque Simulation Method for Permanent-Magnet Synchronous Machines

2011

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Abstract:Cogging torque exists between rotor mounted permanent magnets and stator teeth due to magnetic attraction and this is an undesired phenomenon which produces output ripple, vibration and noise in machines. The purpose of this paper is to study the existence and effects of cogging torque, and to present a novel, rapid, half magnet pole pair technique for forecasting and evaluating cogging torque. The technique uses the finite element method as well as Matlab research and development oriented software tools to reduce numerous computing jobs and simulation time. An example of a rotor-skewed structure used to reduce cogging torque of permanent magnet synchronous machines is evaluated and compared with a conventional analysis method for the same motor to verify the effectiveness of the proposed approach. The novel method is proved valuable and suitable for large-capacity machine design.

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“…With stator slots skewing [7]- [9], the cogging torque and total harmonic distortion (THD) of no-load back-EMF can be reduced significantly, but meanwhile, the output torque is also reduced. Besides, rotor teeth axial pairing technique is effective for decreasing cogging torque [10], however, this method is restricted in rotor teeth with an even number. In [11]- [13], a new teeth notching method is mentioned to reduce cogging torque, which is effective but may add considerable difficulty in manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Optimization of an Outer-Rotor V-Shaped Permanent Magnet Flux Switching Motor Based on Multi-Level Design Method

et al. 2016

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Flux-switching permanent magnet (FSPM) motors have gained increasing attention in the electric vehicles (EVs) applications due to the advantages of high power density, high efficiency. However, the heat sources of both permanent magnet (PM) and armature winding are located on the limited stator space in the FSPM motors, which may result in the PM overheated and irreversible demagnetization caused by temperature rise and it is often ignored in the conventional thermal analysis. In this paper, a new electrical-thermal two-way coupling design method is proposed to analyze the electromagnetic performances, where the change of PM material characteristics under different temperatures is taken into consideration. Firstly, the motor topology and design equations are introduced. Secondly, the demagnetization curves of PM materials under different temperatures are modeled due to PM materials are sensitive to the temperature. And based on the electrical-thermal two-way coupling method, the motor performances are evaluated in details, such as the load PM flux linkage and output torque. Then, the motor is optimized, and the electromagnetic performances between initial and improved motors are compared. Finally, a prototype motor is manufactured, and the results are validated by experimental measurements.

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Cogging torque reduction in permanent magnet flux-switching machines by rotor teeth axial pairing

Cited by 67 publications

References 10 publications

Investigation of a Co-Axial Dual-Mechanical Ports Flux-Switching Permanent Magnet Machine for Hybrid Electric Vehicles

Investigation of a Co-Axial Dual-Mechanical Ports Flux-Switching Permanent Magnet Machine for Hybrid Electric Vehicles

A Novel Cogging Torque Simulation Method for Permanent-Magnet Synchronous Machines

Multi-Objective Optimization of an Outer-Rotor V-Shaped Permanent Magnet Flux Switching Motor Based on Multi-Level Design Method

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