采用机床主电动机功率法和声发射（AE）法来获取切削过程中发出的刀具磨损和破损信号，建立了刀具状态试验系统。

Experiments were implemented to obtain the motor power and AE signals under different cutting parameter condition(cutting velocity, feed velocity and cutting depth), tool wear and breakage conditions.

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本文针对微型电动汽车，在比较多种常用的直流斩波电路基础上，选择三重化桥式斩波电路作为功率变换器主电路并研究了其工作原理。

Compared with a variety of relatively common DC chopping circuit, this paper selects the triple H-bridge chopping circuit to drive DC motors and introduces its working principles.

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