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- W4378528720 abstract "Spacecraft motors are often driven with trapezoidal phase currents to achieve higher output torque. For hollow cup motors (HCM) driven by trapezoidal wave currents, parallel magnetised permanent magnet (PM) motors produce an air gap magnetic field (AMF) waveform which is significantly different from the trapezoidal wave, causing the motor to generate noise or vibration. The existing control optimisation method or structure improvement design method is difficult to directly apply to HCM due to its large gas gap. In this paper, according to the fundamental theory of a constant magnetic field, the AMF of HCM is analysed using the equivalent surface current method (ESCM) and its mathematical model is established. The analytical expression of the AMF is solved, and the influencing parameters of the AMF are clarified. The structural design of the HCM with eccentric PMs sintered with high-performance NdFeB is further improved. On this basis, a prototype motor is designed. Simulation results show that the structure can effectively increase the width of the flat section of the AMF and make the AMF close to an ideal trapezoidal wave (ITW). Experiments verify the correctness of the method." @default.
- W4378528720 created "2023-05-28" @default.
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- W4378528720 date "2023-05-27" @default.
- W4378528720 modified "2023-09-30" @default.
- W4378528720 title "A Novel Design of Permanent Magnets for the Air Gap Magnetic Field of Hollow-Cup Motor" @default.
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- W4378528720 doi "https://doi.org/10.3390/app13116537" @default.
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