内置式永磁同步电机新的深度弱磁策略*

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和MTPV控制原理相结合,提出了一种新的弱磁控制策略。在弱磁第一阶段,通过用电流调节器输出的参考电压与电压空间矢量脉冲调制后输出的极限电压之差对定子直轴电流进行调节,该控制方法充分利用了直流母线电压,并且能平滑过渡;在弱磁第二阶段,采用MTPV控制原理,并进行线性化处理,该控制方法与传统控制方法相比,解决了永磁同步电机的深度弱磁问题。两个阶段之间运用转折速度作为切换器的切换条件,实现弱磁一阶段到第二阶段的平滑过渡。仿真结果表明了所提的控制策略和算法都具有可行性和正确性。

The novel depth field-weakening strategy for Interior Permanent Magnet Synchronous Motor

By combining the field-weakening control principle of interior permanent magnet synchronous motor (IPMSM) with the space vector pulse width modulation(SVPWM) and MTPV control principle, a novel field-weake-ning control strategy for IPMSM was proposed in this paper. In the first phase of the field-weakening, 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 direct axis of stator current. This method makes full use of the DC bus voltage, and can naturally smooth transition; In the second phase of the field weakening, the principle of MTPV con-trol is used for field-weakening control, and then, being linearized, Compared with the traditional method, this meth-od solves the problem of depth weakening of IPMSM. Between the two stages, the turning speed is used for switch condition to achieve the smooth transition for the first stage to the second stage. The effectiveness and correctness of the proposed field-weakening control method and calculation method were verified with simulation results.