中文摘要：

高压步进电动机及驱动器的保护电路是保证其稳定长期运行的关键，对其保护电路进行了设计，通过错相和各种因素引起的过流等异常工作情形反复试验，表明设计电路在错相和过流时能有效保护高压大电流步进电动机驱动器。

英文摘要：

The stepper motor with the over - current, false phase, under - voltage and over - voltage of its driver was studied and experimented. Effective circuit system for protection was designed to deal with varied abnormal situation in the condition of stepper motor with its driver working under high voltage and current.