Experimental principles of three-phase bridge type fully controlled rectification and DC motor speed regulation

The three-phase bridge type fully controlled rectification circuit can use a trigger to control the conduction of the rectifier, thereby changing the direction and magnitude of the current. the goal of. In the experiment, the three-phase AC power is stepped down by the transformer and then input into the three-phase bridge fully controlled rectifier circuit. After filtering by the capacitor, the DC power required by the motor is obtained.

The DC motor speed regulation experiment is to adjust the motor speed by changing the voltage and current on the motor winding. We can change the output power of the DC motor by adjusting the triggering timing and duty cycle of the trigger to achieve speed regulation. By changing the width and frequency of the trigger pulse, fixed speed control and multi-speed control of the motor can also be achieved, improving motor efficiency and operating stability.

Evolved from the three-phase half-wave controlled rectifier circuit.

Three-phase bridge-type fully controlled rectification and DC motor speed regulation are two sets of three-phase half-wave circuits connected in series. The common cathode group and the common anode group are controlled simultaneously, and the control angles are α.

Three-phase AC bridge-type fully controlled rectifier and DC motor are currently the most widely used power electronic circuits in various rectifier circuits. This circuit can be used when applying to DC motor speed regulation.

Can a three-phase fully controlled bridge rectifier circuit be used to control the speed of a DC motor?

A three-phase fully controlled bridge rectifier circuit can be used to convert three-phase alternating current into Direct current, further controlling the motor speed needs to be achieved through different motor control methods. Among them, directly adjusting the voltage of the motor can control the speed of the motor. By adjusting the duty cycle and frequency of the control signal, fine adjustment of the motor can be achieved. Therefore, a three-phase fully controlled bridge rectifier circuit can be used to control the speed of a DC motor.