In order to study the influence of current harmonics generated by PWM inverter on radial electromagnetic force and vibration response of squirrel-cage induction motor, an analysis method is introduced in this paper. Firstly, the relationship among the order and frequency of electromagnetic force wave of the motor under the action of harmonic current is analyzed theoretically. Secondly, a squirrel-cage induction motor is used to build a vibration response analysis model with multiple physical field coupling. The electromagnetic force wave and vibration response spectrum of the motor under sinusoidal power supply and PWM harmonic power supply are obtained. The results show that: for the prototype, the frequency components of 0-order, 2 (2p) order electromagnetic force wave will be introduced when the harmonic current of the inverter is supplied. Finally, the correctness of the analysis method is verified by the vibration experiment of the prototype.

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PWM逆变器馈电鼠笼式感应电机径向电磁力及振动响应特性研究

为了研究PWM逆变器产生的电流谐波对鼠笼式感应电机径向电磁力和振动响应的影响，本文介绍了一种分析方法。首先从理论上分析了谐波电流作用下电机电磁力波的阶次与频率的关系。其次，采用鼠笼式感应电机建立多物理场耦合的振动响应分析模型。得到了电机在正弦电源和PWM谐波电源下的电磁力波和振动响应谱。结果表明：对于样机，在提供逆变器谐波电流时，会引入0阶、2(2p)阶电磁力波的频率分量。