永磁同步电机(PMSM)的高性能控制需要提供转速及转子位置的精确信息。这些信息通常可以通过旋转变压器、光电编码器等机械传感器来测得。但是高性能的机械传感器价格较高,安装困难且难以适应恶劣环境。通过测量电机的电信号,根据获得的电信号和电机自身参数能够计算出转子的位置和电机转速信息。利用电机反电动势与电机转速之间的关系,设计了基于反电动势的滑模观测器来对电机转子位置及电机转速进行估算,从而实现表贴式永磁同步电机的无速度传感器控制。

The highperformance control of permanent magnet synchronous motors requires accurate information of the speed and rotor position. This information can usually be measured by mechanical sensors such as resolvers and photoelectric encoders. However, it is difficult to use highperformance mechanical sensors since their high price, difficulty in installation, and poor adaptability to harsh environments. By measuring the electrical signal of the motor, the position of the rotor and the motor speed information can be calculated based on the obtained electrical signal and the motor’s parameters. In this paper, based on the relationship between motor back electromotive force and motor speed, a sliding mode observer based on back electromotive force was designed to estimate the motor rotor position and motor speed, so as to realize the speed sensorless control of surfacemount permanent magnet synchronous motor.

TM 351