Due to highly non-linear magnetic linkage,a switched reluctance motor (SRM) generates a severe torque ripple,and a large radial force appears when the stator coil commutates.The bending vibration of its rotor will happen when the radial force is exerted on the rotor, which leads to the continual changes of air gap and electromagnetic force.The motion of the rotor becomes very complicated.Therefore, the rotor dynamics of the motor in coupling situation has become a research hotspot.The electromagnetic force function of the rotor was obtained by the empirical formula for the single-tooth force of the rotor.The bending vibration equation of the rotor was established by the finite element method.The critical rotational speed of the rotor under different bearing stiffness was analyzed by using the Campbell diagram.The numerical simulation of the rotor motion trajectory was carried out and the influence of the rotational speed on the maximum displacement of the rotor was discussed.The results show that the maximum displacement at the rotor intermediate nodes in normal speed range is not greater than the gap size, and the energy distribution of the vibration displacement spectrum is closely related to the rotational speed and low order natural frequency of the rotor.The rotor motion rule of switched reluctance motors could be grasped through this study, which provides a dynamic evaluation for the design of switched reluctance motors.
王 峰1，2,吴志强1，2，李亚杰1，2. 电磁激励下开关磁阻电机转子的弯曲振动分析[J]. 振动与冲击, 2018, 37(18): 243-250.
WANG Feng 1 WU Zhiqiang 2 LI Yajie 2 . Bending vibration analysis of a SRM rotor under electromagnetic excitation. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(18): 243-250.
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