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A novel hybrid excited asymmetric stator pole doubly salient machine (HEASPDSM) is proposed in this paper. The new topologies and operational principle are first investigated by using a simplified equivalent magnetic circuit model. The harmonic components of air-gap flux density are then analyzed. The influence of key structural parameters of the proposed machine on the flux regulation ability and torque is studied. A full comparison on main electromagnetic performance indexes of the proposed 12/7 (stator/rotor poles) HEASPDSPM and several traditional doubly salient machines is presented. A prototype is fabricated and tested to validate the theoretical analysis. The results well demonstrate that the HEASPDSPM possesses various merits, such as strong flux regulation capability, high torque density, low cogging torque, and low torque ripple. [ABSTRACT FROM AUTHOR]

Doubly salient permanent magnet machine (DSPMM) has received extensive attentions recently due to its simple structure, high reliability, high torque density, etc. An improved 4/4 stator/rotor single-phase asymmetric-stator-pole DSPMM is proposed in this paper. First, it has investigated the topologies and operating principle based on torque expression and graphical description. Then, the effect of key structure parameters on torque is studied based on the 2-D finite-element algorithm. And then, comprehensive comparison on electromagnetic torque for the original and new machines is made. Finally, one prototype for the improved structure is manufactured and tested. It indicates that lower cogging torque, lower torque ripple, and stronger starting capability can be obtained by the improved structure. The theoretical results are well validated by comprehensive experiments. [ABSTRACT FROM AUTHOR]

One novel 4/6 stator/rotor single-phase doubly salient permanent magnet machine with asymmetric stator poles is proposed in this paper. The stator poles of proposed machine are distributed non-uniformly along the circumference of the stator yoke. First, it investigates the new topology and working principle in detail. Then, the presented structure is optimized based on 2-D finite element analysis. Finally, full comparison of electromagnetic performance indexes of the new machine with those of the traditional one is also presented. It indicates that the novel structure has a much higher torque density, lower cost of permanent magnet, and a much better starting capability than those of the traditional one under the constant volume and electrical load. [ABSTRACT FROM AUTHOR]

One novel 6/7 stator/rotor hybrid excitation-biased flux permanent magnet machine (HE-BFPMM) is proposed in this paper. First, it discusses the new structure and operation principle in detail. Then, one improved design optimization technique is proposed to refine the HE-BFPMM based on a 2-D finite-element algorithm. Afterward, a comprehensive electromagnetic performance comparison between HE-BFPMM and original 6/7 stator/rotor BFPMM (ORI-BFPMM) has been made quantitatively by the premise of constant out radius and axial length. It indicates that, compared with ORI-BFPMM, the HE-BFPMM can demonstrate much higher no-load back electromotive force, lower torque ripple, higher PM material utilization ratio, and stronger flux-weakening capability. [ABSTRACT FROM PUBLISHER]