单相感应电动机负载变化对扭转振动的影响机理

Effect Mechanism of Load Variation on Torsional Vibration for Single-phase Induction Motor

单相感应电动机运行时负载变化对扭转振动的影响限制了其使用范围,为了剖析负载变化对扭转振动的影响机理,建立了单相感应电动机的数学模型,包括简化等效电路和对应的相量图,同时定义了旋转磁场的椭圆度;然后改变额定电压工况下电动机的负载,对电动机转子的扭转振动进行了测试,结果表明负载变化时转子的扭转振动存在极小值,且主副绕组电参数会产生相应的变化;采用相量图对实验结果进行了分析,揭示了单相感应电动机负载变化对其扭转振动的影响机理。

For the influence of load variation on its torsional vibration, the application range of single-phase induction motor is limited. In order to analyze the effect mechanism of load variation on torsional vibration, the mathematical models of single-phase induction motor are established firstly, including the simplified equivalent circuit and corresponding phasor diagram, meanwhile the ellipse degree of rotating magnetic field is defined. Then the load is changed under the motor rated voltage, the torsional vibration of motor is tested and the results show that the existence of minimum, and the parameters of motor winding are changed correspondingly. The experimental results are analyzed by using phasor diagram finally, and the effect mechanism of load variation on torsional vibration for motor is revealed.