摘  要：针对无刷直流电动机控制系统IGBT模块工作在高开关频率情况下会产生高电压的问题，通过分析过电压产生机理，采用相应的对策，即设计相应的吸收电路，保护IGBT安全工作。介绍了工作原理及保护措施，以获得系统安全稳定运行。
关键词：无刷直流电动机；IGBT;过电压;吸收电路

Abstract: Inverter is used to replace mechanical commutator in control system of DC motor,IGBT will generate high voltage when it works in high switching frequency.Analyzed the mechanism of over-voltage generation, corresponding measures could be taken to ensure the safe work of IGBT.Introduced the working principle and protection measures,to obtain the safe and stable operation of the system.
Key Words: Brushless DC motor;IGBT;Over-voltage;Absorption circuit