高速PMSM无传感器角度误差分析及补偿方法

High Speed PMSM Sensorless Angle Error Analysis and Compensation Method

在永磁同步电机(PMSM)无传感器数字控制系统的高速弱磁阶段,受脉宽调制(PWM)开关频率限制,载波比随弱磁转速升高不断降低,与基速相比系统存在更大的数字信号延时。延时导致的转子位置角度观测误差及电压矢量相位滞后影响了电流的解耦性能,进而影响电机高速弱磁时的动态性能和稳定性,严重时导致电机失控。针对此问题,此处提出一种PMSM高速运行下的转子位置角度误差及电压矢量相位滞后补偿策略,该策略实现简单可靠,可提高PMSM无传感器高速弱磁运行时的稳定性。仿真和实验结果验证了该补偿策略的有效性,且具有一定的应用价值。

During the high-speed flux weakening stage of the permanent magnet synchronous motor(PMSM) sensorless digital control system, due to the limitation of the pulse width modulation (PWM) switching frequency, the carrier ratio decreases as the flux weakening speed increases.Compared with the fundamental speed , the system has a greater digital signal delay.Delay will lead to rotor position angle observation error and voltage vector phase lag, affecting the decoupling performance of the current regulator, which in turn affects the dynamic performance and stability of the motor at high-speed and flux weakening.In severe cases, the motor is out of step.To solve this problem, a compensation strategy for rotor position angle error and voltage vector phase lag under high-speed is proposed, which is simple and reliable, and improves the stability of PMSM sensorless and high-speed, flux weakening operation.Simulation and experimental results verify the effectiveness of the compensation strategy.This compensation strategy has a certain application value.