Suppression of Torque Ripple for Consequent Pole PM Machine by Asymmetric Pole Shaping Method

Qi, Ji; Zhu, Z. Q.; Yan, Luocheng; Jewell, G.W.; Gan, Chengwei; Ren, Yuan; Brockway, Simon; Hilton, Christopher

doi:10.1109/tia.2022.3159629

Cited by 11 publications

(16 citation statements)

References 42 publications

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“…Since the production of torque ripple in T r has been demonstrated in ref. [13], in this paper, with a similar method adopted, only the production of torque ripple in T PM and cogging torque will be derived as follows.…”

Section: Torque Ripple Productionmentioning

confidence: 99%

“…Rare-earth permanent magnet (PM) material faces continual challenges of high cost, price fluctuation, and volatile supply, which remain major concerns for rare-earth PM machines [1]. Consequent-pole (CP) PM machines provides a scope to decrease the volume of rare-earth materials in a machine of a given rating and have attracted considerable interest [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. For a consequent pole permanent magnet (CPPM) rotor, alternating poles are formed of iron, while the PMs are in the other poles [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…However, even when they are competitive in terms of torque density and/or magnet volume, CPPM machines also have drawbacks, including the large torque ripple [12,13], lower average torque [14], axial shaft flux leakage [15], and relatively larger unbalanced magnetic force [16]. Arguably the foremost of these is the large torque ripple in the CPPM structures [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…Arguably the foremost of these is the large torque ripple in the CPPM structures [17,18]. It has been found that additional harmonics in back electromotive force (EMF), inductance, and cogging torque resulting from the unbalanced features between iron and PM poles will contribute to the overall torque ripples [12,13], which in turn gives rise to significant vibration and noise.…”

Section: Introductionmentioning

confidence: 99%

“…Investigations reported in refs. [12,13] and demonstrated that different pole shapes between PMs and iron poles as well as asymmetric pole shaping are effective in suppressing the torque ripple for a 12slot/8-pole (12s8p) CPPM machine. A non-uniform air-gap profiling method has been proposed in ref.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Influence of slot/pole number combinations and pole shaping on electromagnetic performance of permanent magnet machines with unbalanced north and south poles

Zhu

Jewell

et al. 2023

IET Electric Power Appl

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The influences of slot/pole number combinations on electromagnetic performances, including flux linkage, inductance, and torque ripple harmonic components etc., resulting from unbalanced characteristics between north and south poles in concentrated winding permanent magnet (PM) machines with symmetrical and asymmetric rotor pole shaping methods are theoretically analysed and experimentally validated in this paper. It shows that for the PM machines with odd number of coils per phase per submachine, including consequent pole (CP) and surface-mounted PM (SPM) machines, the influences of unbalanced pole characteristics can lead to additional torque ripple harmonics due to additive effects in windings, but can be cancelled in other machines. Compared with symmetrical pole shaping method, asymmetric pole shaping method can result in lower torque ripple for CPPM machines with odd number of coils per phase per submachine, while symmetrical and asymmetric pole shapes have similar effects on torque ripple reduction for other CPPM machines and all the SPM machines. The findings have been validated by finite element analyses on 12-slot/8-pole, 12-slot/10-pole, 9-slot/6-pole, and 12-slot/14-pole machines, and by experiments with 12-slot/8-pole and 12-slot/10-pole CPPM prototypes.

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Section: Torque Ripple Productionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of slot/pole number combinations and pole shaping on electromagnetic performance of permanent magnet machines with unbalanced north and south poles

Zhu

Jewell

et al. 2023

IET Electric Power Appl

Self Cite

View full text Add to dashboard Cite

show abstract

Multi‐Objective Optimization and Analysis of Asymmetric Hybrid‐Magnet Offset Motor for Electric Vehicles

Shi,

Lv,

2023

IEEJ Transactions Elec Engng

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Aiming at the high cost of permanent magnet synchronous motor and the reduction of motor output performance caused by high cogging torque and torque ripple, an asymmetric hybrid‐magnet offset motor is proposed. Based on the winding function theory and the equivalent magnetic circuit method, the expressions of stator and rotor magnetic potential are derived respectively, and the analytical model of torque ripple is established by combining with the Lorentz force law. By using the magnetic pole offset method, the phase offset model of the cogging torque is established, and the analytical expressions of the cogging torque and the magnetic pole offset angle are derived. The results of the simulation and experiments show that the asymmetric hybrid‐magnet offset motor has lower no‐load back‐EMF harmonic content and rare‐earth material ratio than the traditional permanent magnet motor, and its performance in terms of the cogging torque and the torque ripple is better than that of the traditional permanent magnet motor. © 2023 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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A critical review of radial field in-wheel motors: technical progress and future trends

Yan,

Hu,

et al. 2024

eTransportation

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Suppression of Torque Ripple for Consequent Pole PM Machine by Asymmetric Pole Shaping Method

Cited by 11 publications

References 42 publications

Influence of slot/pole number combinations and pole shaping on electromagnetic performance of permanent magnet machines with unbalanced north and south poles

Influence of slot/pole number combinations and pole shaping on electromagnetic performance of permanent magnet machines with unbalanced north and south poles

Multi‐Objective Optimization and Analysis of Asymmetric Hybrid‐Magnet Offset Motor for Electric Vehicles

A critical review of radial field in-wheel motors: technical progress and future trends

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