基于锁频环的内置式永磁同步电机无传感器控制

Frequency-locked Loop Based Sensorless Control for Interior Permanent Magnet Synchronous Motor

针对传统利用锁相环获取扩展反电动势中转速与转子位置信息的方法在电机升速或降速时会产生一定转速观测误差的问题,提出一种基于锁频环的内置式永磁同步电机无传感器矢量控制策略。采用锁频环辨识转子角速度,可有效增强电机在升速或降速时对转速的辨识能力;在此基础上,利用同步坐标系滤波器指定消除扩展反电动势中包含的低次谐波;设计输出滤波器进一步提高转速与位置观测的抗扰能力。此外,文中推导转速与位置观测的传递函数,依据传递函数给出控制参数设计原则,最后通过仿真及硬件在环测试,验证该方案的可行性。

Conventional phase-locked loop based speed and rotor position observer using extended back-electromotiveforce(EMF) produce finite speed observation errors when the motor is working at the acceleration and deceleration process. Aiming at solving the above-mentioned problem, a novel sensorless vector control method for interior permanent magnet synchronous motor based on frequency-locked loop(FLL) was proposed. The performance of speed estimation was enhanced during the acceleration and deceleration process by adopting FLL. Based on that, the harmonics contents in the extended back-EMF were selected eliminated by using the synchronous reference frame filter. The output filter was designed to obtain better disturbance rejection of speed and position observation. The transfer function of the speed observation and the rotor position observation was deduced. Based on the transfer function, the control parameters design guidelines were given. Finally, the effectiveness and feasibility of the proposed speed and rotor position estimation algorithm was verified by simulation and hardware-in-the-loop(HIL) tests.