变频器的构成：
Structure of frequency converter:
1键盘：作用是设置参数、监视各参数值（如：电流、电压、频率、温度、转速等）、调速。
1 keyboard: it is used to set parameters, monitor various parameter values (such as current, voltage, frequency, temperature, speed, etc.), and adjust speed.
2电源板：作用是提供各部分电路的工作电压，保证各电路的正工作。
2 power board: it is used to provide the working voltage of each part of the circuit and ensure the positive operation of each circuit.
3 控制主板：作用是产生六路驱动信号来控制逆变模块，同时也对各保护信号和各接口信号的处理。
3 control board: it is used to generate six driving signals to control the inverter module, and to process the protection signals and interface signals.
4 整流桥：作用是将输入交流电变成直流电。
4 rectifier bridge: it is used to change the input alternating current into direct current.
5 电解电容：作用是将整流后的脉动直流电变成平滑的直流电。
5 electrolytic capacitor: it is used to change the rectified pulsating DC into smooth DC.
6 充电电阻：作用是上电瞬间对主电解电容限流，以防止充电电流过大损坏整流桥和主电解电容。
6 charging resistance: it is used to limit the current of the main electrolytic capacitor at the moment of power on, so as to prevent excessive charging current from damaging the rectifier bridge and the main electrolytic capacitor.
7 继电器或接触器：作用是当主电解电容充电完成以后短接充电电阻而承受主电流。
7 relay or contactor: it is used to short-circuit the charging resistance and bear the main current after the main electrolytic capacitor is charged.
8 逆变模块：作用是将平滑的直流电变成接近正弦波的三相交流电。
8 inverter module: the function is to change the smooth direct current into three-phase alternating current close to the sine wave.
9 保险管：作用是保护逆变模块和整流桥。
9 fuse: it is used to protect inverter module and rectifier bridge.