Abstract
This paper proposes the use of a novel cylindrical arc permanent magnet synchronous motor (CAPMSM) in a large telescope, which requires high positioning accuracy and low torque ripple. A 2D finite element method was used to analyze the cogging torque of the CAPMSM. The CAPMSM can be an alternative for a rotating motor to realize direct drive. A new method is proposed to separate the cogging torque, Tcog, into the torque, Tslot, generated by the slotted effect and the end torque, Tend, generated by the end effect. The average torque and the torque ripple are optimized considering stator center angle, the angle between two adjacent stators and the unequal thickness of a Halbach permanent magnet. The torque ripple decreased from 31.73% to 1.17%, which can satisfy the requirement of tracking accuracy for large telescopes.
Highlights
A traditional rotary motor integrating gear box is used to achieve limited angular motion, which causes issues such as taking up a lot of space, leading to low transmission accuracy
An auxiliary poles optimal design is adopted to reduce the end effect reluctance force of permanent magnet linear synchronous motor (PMLSM), which is caused by a finite stator length [10]
Zou et al This paper proposes a novel cylindrical arc permanent magnet synchronous motor (CAPMSM)
Summary
A traditional rotary motor integrating gear box is used to achieve limited angular motion, which causes issues such as taking up a lot of space, leading to low transmission accuracy. The slotted torque and cogging torque are reduced by the variations of permanent magnet (PM) arrangement [3,4]. An auxiliary poles optimal design is adopted to reduce the end effect reluctance force of permanent magnet linear synchronous motor (PMLSM), which is caused by a finite stator length [10]. Liu et al proposed a method of reducing total torque ripple by magnets shifting [17]. PM arrangement was proposed has In theReference least total harmonic distortion of air-gap flux density and cogging torque. The detent force of the proposed CAPMSM is optimized considering stator central of slot pitch. The optimal stator center angle is obtained by finite element verification of the left and angle, angle between two adjacent stators, unequal thickness of Halbach PM, and the central angle of right end forces. A new method proposed to separate cogging by torque, Tcog, effect into the torque, Tslot, generated by the slotted effect and the end torque, Tend, generated by the end effect for CAPMSM
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