一种永磁同步电机转子位置混合辨识方法

A Hybrid Rotor Position Identification Method for Permanent Magnet Synchronous Motor

针对内置式永磁同步电机(IPMSM),提出了一种基于最小电压矢量注入法和滑模观测器法的混合控制策略。低速时,采用最小电压矢量注入法获取转子位置,中高速阶段则通过滑模观测器法对转子位置进行辨识。角度和速度过渡阶段,通过对两种方法获得的位置误差信号进行加权处理,得到混合位置误差信号后,通过一个软件锁相环即可获得转子位置。设计了一个和速度有关的斜坡函数对注入电压进行过渡处理。实验结果表明,采用该文提出的混合控制策略能够实现电机在额定负载条件下从静止状态直接闭环起动,实现了高低速两种算法之间的平滑切换,能够进行宽范围内的无位置传感器调速控制,且低速算法实现简单,具有较大的工业应用价值。

A hybrid speed sensorless control strategy of interior permanent magnet synchronous motor is investigated,which combine the minimum voltage vector injection method and sliding-mode observer method.The method of minimum voltage vector injection is used to obtain the rotor position in the low speed range.The rotor position is identified through the sliding mode observer method at middle and high speed.In the transition region of position and speed,first,the position error of two methods are combined with the weight function which is speed dependently.After getting the mixed position error,the rotor position can be obtained by a phase-locked loop(PLL).For the transition of injected voltage,a ramp function related to speed of voltage amplitude is designed.The experimental results show that the position identification method proposed in this paper can realize the direct closed-loop start from the stationary state under the rated load,and the switch strategy implemented a smooth transition.Wide range speed control is realized,Low-speed algorithm is simple to implement,and it has great value in industrial application.