交流电机变绕组匝数拓宽调速范围的新方法

在典型交流电机调速应用领域需要拓宽电机的调速范围。传统的拓宽电机调速范围的方法主要包括弱磁调速、 变极调速以及改变绕组结构等。针对电动汽车驱动电机应用背景，提出了一种拓宽交流电机调速范围的新方法，即在维 持电机本体结构与变频器功率等级基本不变的情况下，利用由少量全控和不控电力电子器件构成的绕组调节功率变换 电路，实现电机定子绕组等效匝数的连续可调。仿真结果表明，定子绕组等效匝数是可以通过脉冲控制方法实现连续可 调的，应用该方法，可以拓宽电机的调速范围，使其适应不同应用场合对电机转矩曲线的要求。

Wide Speed Range Control of AC Motor by Changing Equivalent Winding Turns

Speed range of motor is often need extended in typical AC motor speed control applications. Traditional methods include field-weakening control, pole-changing and winding-change method. A new way to extend speed range was put forward. The proposed method requires a power conversion circuit controlled by a small number of electronic devices to make the equivalent winding turns continuously adjustable so as to achieve the purpose of extending constant power operation. Simulation results show that the equivalent stator winding turns can be changed continuously by this pulse control method. Using this method can broaden the range of the motor speed to adapt to different requirements for motor torque curve.