Based on relation between electromagnetism force and coil circuit of high speed solenoid, The solenoid drive circuits are designed based on PWM controlled type.

以电磁铁的电磁吸力与电磁铁线圈的电流的关系为基础，设计基于PWM控制方式的电磁阀驱动电路。

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A strategy of speed control for vector-controlled asynchronous motor drive system using sliding mode variable structure control with an integral action was proposed.

针对滑模变结构控制的抖振问题，提出一种用于异步电动机矢量控制系统的积分滑模变结构速度控制方法。

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Wire feeder of four drive roll system is controlled bu welding power source with the advantages of stable feed speed, good start and brake characteristics, easy to move.

采用四轮驱动送丝机，受焊接电源控制，送丝稳定，启动，制动良好，维护方便。

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