摘要
受集肤效应及漏磁路饱和的影响,异步电机起动过程中的定转子漏阻抗参数是变化的,会引起电动势变化并影响起动性能的计算精度。为了在计及上述因素时准确计算异步电机起动性能,建立一种能够考虑参数变化引起电动势变化的异步电机状态方程解析模型。该模型通过在传统解析模型中引入可随参数变化的电动势矩阵方程,用以计及起动过程中定子漏抗、转子漏抗及转子电阻等参数的动态变化情况,并能够准确计算得出电机起动性能。以YKK710-4、3 150 k W,YB800-8、1 600 k W以及Y132S-4、5.5 k W等3台电机为实例进行了仿真分析。结果表明:考虑由参数变化引起电动势时计算得到起动电流、起动转矩略高且起动响应速度明显快于传统模型。为了验证模型正确性,利用时步有限元法计算对比了YKK710-4、3 150 k W空载起动过程,也与5.5 k W电机实测起动电流波形对比,验证了模型的有效性。
Due to skin effect and saturation of the leakage magnetic circuit,the stator and rotor leakage impedance parameters of cage induction motors are variable in start process,which may cause the changes in electromotive force（ EMF） and affect the calculation accuracy of starting performance. In order to accurately calculate the starting performance with the above factors considered,this paper establishes a new analytical model to calculate the starting performance,in which EMF matrix equation which changes with the change of the parameters is presented based on the traditional analytical model. With this model,the dynamic variation of the parameters,such as stator leakage,rotor leakage and rotor resistance,can be considered effectively,and the starting performance can be calculated accurately. Taking YKK710-4 3 150 k W,YB800-8 1 600 k W and Y132S-4 5. 5 k W for example,the simulation analysis is performed and the results show that,after considering the EMF changes caused by the variable parameters,the starting current and torque is slightly higher than the traditional model and starting response is fast.To verify the correctness and effectiveness of the presented model,the time-step finite element analysis is used to compute the starting process of the YKK710-4、3 150 k W motor with no-load condition,and the comparison between test and simulation start currents of 5. 5 k W motor is also presented.
出处
《电机与控制应用》
北大核心
2016年第3期42-48,共7页
Electric machines & control application
关键词
异步电动机
起动特性
参数变化
集肤效应
饱和
Asynchronous motor
starting characteristic
parameter change
skin effect
saturation
