Research finds torque ripple in bearingless motors affects performance in induction motors, suggesting improved control methods.
Bearingless motors can realise the rotor active suspension by the radial electromagnetic force, whereas the suspension force and torque ripple will increase the difficulty of motor control, which may lead to the stator and rotor collision and irreversible damage to the motor. In order to obtain the principle and variation of the suspension force ripple and torque ripple of bearingless induction motors under the condition of multi‐harmonic magnetic field, the complex coupling relationship between harmonic magnetomotive force (MMF), magnetic permeance and harmonic magnetic field is clarified firstly. Based on the traditional mathematical model of the suspension force, the calculation formula of the radial suspension force is derived and the mechanism of the radial suspension force ripple is revealed. Secondly, the radial suspension force and the electromagnetic torque are calculated by the finite element method, and the torque magnetic field and the suspension magnetic field are decoupling analysed. The dynamic changes of the radial suspension force and the torque with the time are given, and the relationship among multi‐harmonic magnetic field coupling, radial suspension force ripple and torque ripple is clarified. Finally, the accuracy of analytical calculation and finite element calculation is proved by experiments.
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Zexing Li (2025) studied this question.
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