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

研究了基于“最大转矩控制参考系”的永磁同步电机高性能驱动无位置传感器控制。研究结果如下：1。(1)提出了一种新的无传感器控制电机模型，以扩大稳态和低速驱动范围。(2)将最大转矩控制参考系的信号注入应用于扩展电动势法的位置估计。(3)通过最大转矩控制框f轴无转矩脉动的信号注入实现位置估计。参数变化与信号注入条件的关系(1)解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，并解释了误差的特点。(2)通过在最大转矩控制参考系f轴注入电流信号，抑制了位置估计误差。(3)利用几百赫兹等低频信号提高位置估计增益。(4)低频信号能有效降低信号电流引起的噪声声级。对速度控制和电流控制性能的评价尚未达到。

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.