异步电动机的负载噪声分析

Analysis on the Noise of Induction Motors with Load

通过负载对电机系统振动模态特性的影响 ,从几个方面分析了负载对异步电动机电磁噪声所产生的影响 ,并对实验测得的数据进行了分析。对于小型异步电机 ,在工频 5 0Hz运转情况下 ,由于其共振频率远离激振力的频率 ,负载引起的电机噪声的变化不大 ,一般在± 3.0dB(A)左右。但在变频供电情况下 ,由于激振力频率发生很大的变化 ,负载引起的电机噪声的变化很大。

Electric machines are always running under load condition,so the noise level of induction motors under such condition will be more accurate.The effects of load on the electromagnetic noise of induction motors were analyzed through the modal vibration behaviours of the electric machinery system.The paper also analyzed the data gathered from the experiments.When working frequency is 50 Hz,the variation of the load noise is insignificant,often about ±3.0dB(A),for the resonant frequency of motor is for apart from the frequency of exciting force.But when the motor is powered under frequency converter condition and because the frequency of exciting force changes greatly,the variation of the load noise in some circumstances may be significant.