Consequent Pole Permanent Magnet Vernier Machine With Asymmetric Air-Gap Field Distribution

Abstract

In recent years, permanent magnet vernier (PMV) machines have been attracting more and more attention due to the inherently exhibited advantages such as high torque density and simple mechanical structure. In this paper, a consequent pole (CP) PMV machine with single-layer concentrated winding is proposed. The novelty is that the asymmetric air-gap field distribution is introduced to improve its working harmonics and to reduce the PM consumption. By employing a CP structure, the flux density amplitude can be enhanced. Moreover, due to uneven distribution of modulator poles on the armature teeth and fault tolerant teeth, the number of periods of modulator poles is only half of that of the stator teeth. Then, significant improvement in flux density working harmonics can be achieved. Furthermore, the superior electromagnetic decoupling capability can be achieved by introducing the fault-tolerant teeth. The relevant electromagnetic performance such as flux density, back electromotive forces, cogging torque and on-load torque have been calculated by using finite-element analyses, which have also been validated by experiments. INDEX TERMS Asymmetric air-gap field distribution, consequent pole, fault-tolerant, flux density working harmonic, permanent magnet vernier machine.

A subdomain model for armature reaction field and open‐circuit field prediction in consequent pole permanent magnet machines

“…Low‐cost consequent‐pole has been designed by Chai et al 19 using double silent ferromagnetic iron pole. PM Vernier motors become a suitable for in‐wheel applications because of its higher torque density and lower torque ripple 20,21 …”

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“…With the merits of high torque density and high efficiency, the permanent magnet (PM) machines have attracted much more attention and thus have been widely used in industrial applications, including the servo systems, direct-drive systems and wind power generations [1]- [5], etc. Since PMs of conventional PM machines are always aligned in the rotor, the eddy current loss of the permanent magnet will cause the rotor heat difficult to dissipate, thus affecting the performance of the motor.…”

Quantitative Analysis of Back-EMF of a Dual-Permanent-Magnet-Excited Machine: Alert to Flux Density Harmonics Which Make a Negative Contribution to Back-EMF

“…Benefiting from the "magnetic gearing effect", permanentmagnet vernier machines (PMVMs) have the inherent advantage of high torque density and can directly drive the load without the help of intermediate transmission devices such as mechanical gearboxes, thus making PMVMs outstanding candidates for direct drive applications [1][2][3][4][5][6]. To date, various topologies have been proposed for PMVMs with high performance.…”