Vacuum pump's start order is: First turns on the driving fluid valve, pours into the driving fluid to the pump, then the starting motor, turns on the inspiration pipeline once more, normal work;
真空泵的启动顺序为：首先打开工作液阀门，向泵内注入工作液，然后启动电动机，再次打开吸气管路，正常工作；
First close the plug of a vacuum or pressure meter, if so mounted on the pump, connected to the pump before starting the motor and then open it when the motor move in the normal speed;
如果泵上装有真空表或压力表，要关闭其与泵相连接的旋塞再启动电动机，待转速正常后再打开；
And then it studies a number of key technologies around the sensor less brushless DC motor control system: Rotor position detection, motor starting and the PWM control technology.
然后分析研究无位置传感器无刷直流电机控制系统的几项关键技术：转子位置检测、启动和PWM控制技术等。
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