A novel disc planetary permanent magnet motor was proposed to resolve the problem of weak low-speed direct drive capability and the single output of traditional permanent magnet motors.Combining a disc motor with a planetary drive,the proposed motor has the characteristics of a complex spatial magnetic field structure,low-speed direct drive,and multi-degree freedom power output.The electromagnetic performance of the proposed motor and the dynamic magnetic circuit model of the uneven air gap between the disc rotor and the planetary stator were analyzed,and the 3D magnetic field model of the motor was divided into 2D models by the radial sectors-of-rings method.Considering the influence of uneven air gap,stator slots,and leakage flux,the equivalent air gap reluctance and equivalent leakage flux reluctance models of the proposed motor were established by introducing the uneven air gap position distribution function.The magnetic field area between the disc rotor and the planetary stator was divided,and the dynamic magnetic circuit model was transformed into a time-varying equivalent magnetic network topology.The flux linkage and no-load back electromotive force of the motor were calculated.The validity of the dynamic magnetic network model was verified by finite element analysis and prototype experiment.Compared with 3D finite element simulation,the equivalent magnetic network is convenient for the analysis and optimization of structure parameters,and it improves the calculation efficiency and provides reference for a magnetic field modeling and analysis of a disc planetary permanent magnet motor.
uneven air gapdisc planetary permanent magnet motorradial sectors-of-ringsair gap distribu-tion functionequivalent magnetic network
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