New Reference Frame for Position Sensorless Controls of Permanent Magnet Synchronous Motors

针对永磁同步电动机高性能驱动问题，研究了基于“最大转矩控制参考系”的无位置传感器控制。结果表明：1.无位置传感器控制的驱动范围扩展（1）推导了一种新的无位置传感器控制的电机模型，以扩展包括稳态和低速的驱动范围。(2)将最大转矩控制参考系的信号注入法应用于扩展电动势法的位置估计。(3)在最大转矩控制框架下，通过信号注入实现了f轴无转矩脉动的位置估计.参数变化与信号注入条件的关系（1）分析计算了温度变化和磁饱和引起的电机参数误差引起的估计误差，并说明了误差的特点。(2)通过在最大转矩控制参考系的f轴上注入电流信号来抑制位置估计误差。(3)通过诸如几百赫兹的较低频率信号来改善位置估计增益。(4)低频信号对降低信号电流引起的噪声声级是有效的，但速度控制和电流控制的性能尚未得到评价。

Position sensorless controls based on a new reference frame, which is called “maximum torque control reference frame”, were studied for high-performance drives of permanent magnet synchronous motors. The results were as follows,1. Driving range extension of sensorless controls(1) A new motor model for sensorless control was derived to extend the driving range including steady state and low-speeds. (2) Signal injection using the maximum torque control reference frame was applied to the position estimation with extended electromotive force methods. (3) The position estimation was realized by signal injection without torque ripples in f-axis of the maximum torque control frame.2. Relation between parameter variation and the condition of signal injections(1) Estimation errors caused by motor parameter errors due to temperature changes and magnetic saturations were calculated analytically and the characteristics of the errors were explained. (2) The position estimation errors were supressed by injecting current signals in the f-axis of the maximum torque control reference frame. (3) Position estimation gain was improved by lower frequency signals such as a few hundred hertz. (4) The lower frequency signals were effective in decreasing sound level of noise due to signal currents.Evaluations of the performance of speed control and current control have not attained yet.