基于改进的脉冲电压注入永磁同步电机转子初始位置检测方法

Initial Position Estimation Method for Permanent Magnet Synchronous Motor Based on Improved Pulse Voltage Injection

由于永磁同步电机存在凸极性,定子电感随气隙磁场饱和程度的不同而变化,电感值中包含了转子位置信息。根据这个原理,研究了通过注入脉冲电压矢量来检测永磁同步电机转子初始位置的方法,分析了不同位置的电压矢量对电感饱和程度的影响,以及对转子位置估测精度的影响,得出了能获得最佳估测精度的优化电压矢量,并提出了改进的五电压矢量注入方式。根据转子所在区域选择优化的电压矢量进行二次计算,进一步提高了转子位置估算的精度。实验结果表明,该方法能够可靠而有效的检测出永磁同步电机的转子初始位置,而且实施简单、估测精度高。

According to saliency of permanent magnet synchronous motor （PMSM）, the information of rotor position is implied in performance of stator inductances due to the magnetic saturation effect. Researches focused on the initial rotor position estimation of PMSM by injecting modulated pulse voltage vectors. The relationship between the inductance variations and voltage vector positions was studied. The inductance variation effect on estimation accuracy was studied as well. An improved five-pulses injection method was proposed, to improve the estimation accuracy by choosing optimaized voltage vectors. The experimental results show that the proposed method estimates the initial rotor position reliably and efficently. The method is also simple and can achieve satisfied estimation accuracy.