Effect of Pole Shaping on Torque Characteristics of Consequent Pole PM Machines

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

doi:10.1109/tia.2022.3156904

Cited by 25 publications

(15 citation statements)

References 40 publications

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“…During the parameterization analysis of Rib and DminMag, the value should not be too large or too small. If the value is too large or too small, the motor stiffness and weak magnetic properties will be affected [7] , so that the motor cannot run . Rib and DminMag selection range is shown in Table 2.…”

Section: Rib and Dminmag Parametric Analysismentioning

confidence: 99%

Method of Cogging Torque Reduction for Built-in Permanent Magnet Synchronous Motor

Yang

Wang

2022

J. Phys.: Conf. Ser.

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Cogging torque is one of the main factors that deteriorate the performance of permanent magnet motor. In order to reduce the cogging torque of built-in permanent magnet motor, a method of optimizing Rib and DminMag to reduce groove torque of built-in permanent magnet motor was proposed. Firstly, the relationship between Rib and DminMag and groove torque is analyzed through the expression of groove torque. Secondly, the optimal Rib and DminMag were found by finite element parametric calculation, and compared with the pre-optimization groove torque, the groove torque was significantly reduced. Finally, the main performance of motor before and after optimization is not significantly reduced.

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Section: Rib and Dminmag Parametric Analysismentioning

confidence: 99%

Method of Cogging Torque Reduction for Built-in Permanent Magnet Synchronous Motor

Yang

Wang

2022

J. Phys.: Conf. Ser.

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“…Nevertheless, AC-magnetized VFMMs generally require large amplitudes of magnetizing currents due to the high thickness of LCF magnets, which inevitably leads to an increased requirement for inverter capacity. Consequent-pole (CP) rotor design is a favorable way to reduce magnet usage and magnetization current, as well as maintain torque output at the same time [17][18][19]. Thus, this paper proposes a novel consequent-pole flux-intensifying memory machine (CP-FIMM) to address the above-mentioned problems for AC-magnetized VFMMs.…”

Section: Of 15mentioning

confidence: 99%

“…Thus, this paper proposes a novel consequent-pole flux-intensifying memory machine (CP-FIMM) to address the above-mentioned problems for AC-magnetized VFMMs. The combination of FI variable-flux characteristics [20][21][22] and a consequent-pole [17][18][19] structure can reduce the amount of AlNiCo magnet, and meanwhile increase the d-axis inductance. Thus, the proposed CP design is advantageous for the reduction of the required magnetizing current magnitude, improvement of magnetic stability and PM utilization simultaneously.…”

Section: Of 15mentioning

confidence: 99%

Investigation of a Novel Consequent-Pole Flux-Intensifying Memory Machine

Yang

Lin

et al. 2022

Energies

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This paper mainly focuses on the investigation and analysis of a novel consequent-pole flux-intensifying memory machine (CP-FIMM). The proposed CP-FIMM exhibits the advantages of a satisfactory flux-regulation range, reduction of the required magnetizing current magnitude, as well as similar torque with much less PM utilization compared to its conventional counterpart. By designing the q-axis flux barriers, the flux-intensifying structure can be realized to enhance the demagnetization withstand capability of the CP-FIMM. The machine topology and operating principle are described. Moreover, the equivalent magnetic circuit model is developed to highlight the performance improvement of the proposed CP-FIMM. Finally, the electromagnetic performance of the proposed CP-FIMM is compared with that of a benchmark conventional FIMM by 2-D and 3-D finite element analysis.

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“…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%

“…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%

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

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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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Effect of Pole Shaping on Torque Characteristics of Consequent Pole PM Machines

Cited by 25 publications

References 40 publications

Method of Cogging Torque Reduction for Built-in Permanent Magnet Synchronous Motor

Method of Cogging Torque Reduction for Built-in Permanent Magnet Synchronous Motor

Investigation of a Novel Consequent-Pole Flux-Intensifying Memory Machine

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

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