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一、引言在许多仪器和控制系统中常常需要测量电动机的速度。例如轴速度的读出,闭环速度控制和为了改善位置控制系统的稳定性而提供的速度反馈。通常用来测量电动机速度的有测速发电机,磁光传感器和增量式轴—角编码器。然而,对于小型电动机,由于考虑电动机的驱动功率,所占空间,重量和成本等附加条件,采用上述器件来测量电动机的速度是不许可的,尤其是在某些应用中,这些传感器和电动机之间的机械连接更为困难。
I. INTRODUCTION In many instrumentation and control systems it is often necessary to measure the speed of a motor. Such as readout of shaft speed, closed-loop speed control, and speed feedback provided to improve the stability of the position control system. Tachometer generators, magneto-optical sensors and incremental shaft-angle encoders commonly used to measure motor speed. However, in the case of small motors, the use of such devices to measure the speed of the motor is not permitted due to additional considerations such as the drive power, space, weight and cost of the motor, and in particular, in some applications, these sensors and motors The mechanical connection between the more difficult.