A Parallel Consequent Pole Reluctance Machine With Bipolar Coil Flux-Linkage

Abstract

This paper proposes a novel parallel consequent pole reluctance machine (CPRM) by introducing dual heteropolar stators and shifted rotors in the axial direction. The proposed machine is geometrically similar to traditional switched reluctance machine (SRM), but with biased permanent magnets (PMs) alternately mounted on stator poles. With this kind of design concept, bipolar sinusoidal coil flux-linkages can be obtained due to the elimination of even harmonics of two axially parallel submachines. Consequently, the harmonic distortions of phase flux-linkage and cogging torque of the proposed 6/4-pole parallel CPRM are notably reduced. The topology features, even-order harmonic cancellation theory and analytical modeling, are addressed, respectively. Then, the electromagnetic characteristics of the proposed 6/4-pole parallel CPRM are investigated and compared with those original variable reluctance machines. Comparison results demonstrate that the proposed parallel CPRM can achieve basically bipolar sinusoidal flux linkage and back-electromotive force (EMF), as well as reduced cogging torque than its original counterparts. Permeance function of the stator poles with NdFeB PMs λs-core (α) Permeance function of the stator poles with core poles λs-front (α)

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

“…Compared with the conventional PM machines with N-S poles rotor, the machines with CP rotors have homopolar PMs (either N-pole or S-pole) [19]. Such arrangement can provide higher back electromotive forces (EMFs) and also larger torque capability for the machines even with smaller PM volume [20], [21]. This increase in torque capability is mainly due to the asymmetric air-gap field distribution [22], [23].…”