Abstract
This paper proposes a design method for the flux modulation poles (FMPs) formed on the stator of surface-mounted permanent magnet vernier machines (SPMVM) considering the winding configurations. In three types of the SPMVM with the different winding configurations, the FMP shapes to maximize the output torque are optimized by employing the analytical equations for the magneto-motive force (MMF) due to the windings, permeance, and flux density in the air-gap. Then, the validity of the optimal shapes for the FMPs is verified by the finite element analysis. It is found that the optimal FMP shapes are designed differently in the three types of the SPMVM and increase the output torque by different ratios according to the winding configurations. In addition, the experimental results for the prototype show that the proposed method can optimally design the FMP shape by analyzing mathematically the effects of the winding configuration and the FMP shape on the output torque of the SPMVM.
Highlights
Surface-mounted permanent magnet vernier machines (SPMVM) have been considered as good candidates to meet the demand for high torque density in direct-driven systems [1,2] such as electric vehicles [3,4,5] and wind power generators [6,7,8]
Because of the air-gap permeance of the flux modulation poles (FMPs), the magneto-motive force (MMF) of the stator windings is modulated into the air-gap flux density harmonic corresponding to the number of rotor pole-pairs
The experimental results show that applying the optimal FMP shapes can improve the average torque up to 24.2%
Summary
Surface-mounted permanent magnet vernier machines (SPMVM) have been considered as good candidates to meet the demand for high torque density in direct-driven systems [1,2] such as electric vehicles [3,4,5] and wind power generators [6,7,8]. In the SPMVM, the numbers of stator and rotor poles are different, but their magnetic fields are synchronized with each other by the magnetic gearing effects. Such magnetic coupling allows the SPMVM to achieve a larger torque density compared with the regular permanent magnet (PM) machines [9]. Because of the air-gap permeance of the FMPs, the magneto-motive force (MMF) of the stator windings is modulated into the air-gap flux density harmonic corresponding to the number of rotor pole-pairs. This paper presents the design method for the FMP shape to maximize the output torque of the SPMVM while considering the harmonic characteristics of the winding MMF. The experimental results show that applying the optimal FMP shapes can improve the average torque up to 24.2%
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