Abstract
Torque ripple is one of the important issues for ferrite assisted synchronous reluctance motors (FASRMs). In this paper, an asymmetrical stator is proposed for the FASRM to reduce its torque ripple. In the proposed FASRM, an asymmetrical stator is designed by appropriately choosing the angle of the slot-opening shift. Meanwhile, its analytical torque expressions are derived. The results show that the proposed FASRM has an effective reduction in the cogging torque, reluctance torque ripple and total torque ripple. Moreover, it is easy to implement while the average torque is not sacrificed.
Highlights
Due to the increasing concerns about electric vehicle applications, research and development of high-performance electric machines are gaining increasingly more attention.[1]
Conventional ferrite assisted synchronous reluctance motors (FASRMs) usually suffer from significant torque ripple due to the interaction between the stator magnet motive force (MMF) and the rotor structure
The major objective of this paper is to propose an asymmetrical stator for improving the electromagnetic performances of the FASRM
Summary
Due to the increasing concerns about electric vehicle applications, research and development of high-performance electric machines are gaining increasingly more attention.[1]. Many methods for reducing the torque ripple in FASRM have been considerably investigated.[4,5] In order to reduce torque ripple, different PM shapes have been introduced, such as skewing of rotor PMs and optimizing PM poles arc.[6,7,8] the structure of the PM becomes complicated and difficult during manufacturing process. Some investigations on the rotor structure to reduce torque ripple has been presented in earlier publications.[9,10] A so-called Machaon PMASRM was proposed, which has different fluxbarrier geometries in different poles.[10] The torque harmonics are compensated in this approach because each adjacent pole has spatial harmonics of similar order but with opposite phase angle. Component of the proposed FASRM is analyzed using finite element method (FEM) and analytical method
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