How to realize motor control of IGBT in inverter

In the frequency converter,IGBT(insulated gate bipolar transistor) is the core switching element used to control the frequency and voltage of the power supply. In that wayIGBTThe realization of motor control in the inverter has the following specific processes:

1. Rectifier: The input end of the inverter is connected to the AC power supply, and the AC power is converted to direct current through the rectifier. The rectifier usually consists of a bridge rectifier circuit.

2. Filtering: Since the DC generated by the rectifier circuit has a ripple, a capacitive filter is needed to smooth the output DC.

3. Inverter: The inverter is a key part of achieving the conversion of direct current to alternating current through controlIGBTThe switch state can convert direct current into three-phase alternating current, thereby controlling the rotation of the motor.

4. Drive circuit: to enableIGBTTo work normally, it is necessary to provide suitable driving signals. The function of the drive circuit is to convert the signal output from the controller to fitIGBTThe drive signal, ensureIGBTReliable on and off.

5. Controller: The controller is the core part of the inverter, which calculates the required output frequency and voltage according to the input instructions (such as the difference between the set value and the feedback value). Controller through regulationIGBTThe switch state is used to control the output of the inverter, so as to realize the speed control of the motor.

6. Brake circuit: In order to ensure that the motor can be safely stopped or slowed down during operation, the inverter also contains a brake circuit. When the speed of the motor exceeds the set value, the braking circuit begins to work, consuming excess energy by increasing the braking resistance, thus slowing down the motor.

To sum up,IGBTThe inverter is mainly used as a switching component, which can adjust the motor power supply by controlling its switching state, so as to realize the control of the motor.

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