静止状态下直线感应电机的参数辨识方法

Parameter estimation of linear induction motor at standstill

直线感应电机气隙较大,并且次级一般是由整块的铝板和次级铁轭压制而成.由于此种次级没有类似于旋转感应电机的鼠笼导条和短路环,导致次级漏感远远小于初级漏感.传统的测量电机参数的空载和堵转试验假设初、次级漏感相等,在直线感应电机中难以实施,因此测量直线感应电机的参数难度较大.本文提出了一种静止状态下直线感应电机的参数辨识方法,无须做空载和堵转试验,通过控制PWM逆变器就可以实现对直线感应电机的初级电阻R1、初级漏感L1、次级电阻R2、次级漏感L2和互感Lm的测量.在参数计算过程中引入了β参数,实验验证了该方法的准确性并且分析了β参数对该方法的影响.

The air-gap of linear induction motors （LIM） is large and the flat-solid secondary con-sists of the aluminum and back-iron plates. Hence,the secondary leakage inductance of LIMs is much smaller than the primary leakage owing to the absence of the squirrel-cage bar and end rings in the secondary LIM. Moreover,the assumption that leakage inductance of stator one of rotor is applied in the conventional parameter estimation technique which includes the no-load and blocked rotor tests. Hence,this conventional technique is not suitable for LIMs and the parameter identification of LIMs is more difficult relatively. In this paper, a parameter estimation scheme for LIMs at standstill is proposed. Without the no-load and blocked rotor tests,the pri-mary resistor Ri ,primary leakage inductance L 1 ,secondary resistor R 2,secondarductance L2 and mutual inductance LIn can be obtained by a PWM inverter. The parameter is proposed and defined to calculate the mutual inductance and secondary leakagly,simulations are performed and the effect of on the proposed method is show the accuracy of the proposed method.