讲述了电动机的常见故障及其保护原理，基于单片机的电动机保护系统主要由采样、控制输出、通讯、显示和软件部分构成。采用软硬件相结合的方法设计了一电动机保护装置，并通过软件仿真验证了其正确性和可靠性，比较得出智能式电动机保护装置具有明显的技术优势，大大提高了电动机保护的安全运行性。

-About the common faults and motor protection principles, microcontroller-based motor protection system consists of sampling, control output, communication, display and software parts. Using a combination of hardware and software designed for a motor protection device, and through software simulation to verify its accuracy and reliability, more intelligent motor protection devices come with a clear technological advantage, greatly improving the safe operation of motor protection .