新的基于内置式永磁同步电机的弱磁控制策略

将内置式永磁同步电机弱磁运行原理与电压空间矢量脉宽调制相结合,提出了一种新的弱磁控制策略.通过用电流调节器输出的参考电压与电压空间矢量脉宽调制后输出的极限电压两者之间的电压差值来改变定子电流相位角,从而重新分配d,q轴给定定子电流分量的大小,最终实现弱磁升速.该控制方法实现了电机高倍弱磁扩速运行,且弱磁电流过渡平滑、响应速度快.与传统弱磁控制方法相比,在弱磁区域能更有效地利用直流母线电压,从而在同样电压和电流限制条件下,电机能产生更高的电磁转矩,适应性更好.仿真和实验结果表明了本文所提弱磁控制策略的有效性和可行性.

A Novel Field-weakening Control Strategy for Interior Permanent Magnet Synchronous Motor

By combining the field-weakening control principles of interior permanent magnet synchronous motor (IPMSM) with the space vector pulse width modulation (SVPWM), a novel field-weakening control strategy for IPMSM was proposed. The difference between the reference voltage updated by current regulator and the saturated voltage output by SVPWM is used for field-weakening control, which modifies the stator current phase angle. The d and q axis stator reference current component is redistributed, and finally, the speed operation range of IPMSM is extended. With this method, high-time speed field-weakening operation was realized, and the smooth transition of field-weakening stator current and fast response were also guaranteed. Moreover, since the proposed method utilizes the dc-link voltage more efficiently, it makes the motor generate higher output torque and has better adaptability in field-weakening operation region than conventional field-weakening control methods under the same voltage and current limitation. The effectiveness of the proposed field-weakening control method was verified with simulation and experimental results.