基于DSP和光电编码器的永磁同步电机速度检测系统

为获取永磁同步电机转子速度,设计了一种基于DSP控制器正交编码电路和光电编码盘的检测系统。DSP识别光电编码盘上光敏管所产生的两路正交编码脉冲,对捕获的脉冲信号进行加减计数,通过对DSP编写的用户程序读取当前计数值,计算电机转子转速。阐述了TMS320F243芯片正交编码和增量式光电编码盘的工作原理,建立了由永磁同步电机、DSP板、逆变功放板和PC机组成的实验测量装置。实验结果表明,在给定的转速设定值下,能够实现快速和较高精度的速度检测,能够满足一般工程系统对交流调速和伺服控制的性能要求。

Speed Measuring System of Permanent Magnetic Synchronous Motor Based on DSP and Optoelectronic Coder

In order to achieve the rotor speed of the permanent magnetic synchronous motors, a measuring system based on the quadrate encoding circuit of DSP controller and optoelectronic coder is designed in this paper. Operational principle of quadrate encoding of TMS320F243 and incremental optoelectronic coder are introduced. Two channels of quadrate encoding signal generated by the photosensitive tubes located on the coding disk are identified and counted by the DSP. The user program is written to read the current counting number and calculate the speed of the rotor. A measuring device consisting of permanent magnetic synchronous motor, DSP board, inversion power amplifier and PC is established to test the proposed method. Experimental results show that rapid and precision performance is obtained under a given speed. Requirement of AC variable speed and servo control for the general motor is satisfied.