Through the reverse phase sequence, the reverse moment that retards the motor is achieved, which is called reverse braking. It belongs to a braking mode of the motor. Below, Senli Motor Xiaobian will take you to understand some content about reverse braking of three-phase asynchronous motors, and hope to help you.

       After the motor is disconnected from the power supply, in order to enable it to stop quickly, the control method is used to add a power supply in reverse phase with the normal operation of the power supply.Three-phase asynchronous motorThe rotation direction of the rotor is opposite to the rotation direction of the rotating magnetic field, and the electromagnetic torque will be generated as the braking torque to accelerate the deceleration of the motor; This is the principle of reverse braking. But it has a disadvantage, that is, when the motor speed is0If the power supply after the reverse phase is not removed in time, the electric machine will reverse.

       We can solve this problem in two ways:

       1.A time relay can be added to the control loop of the motor reversing power supply to disconnect the power supply after the reversing phase after braking for a period of time, so as to avoid the motor reversing. However, because the braking time of this method is difficult to estimate, the braking effect is not accurate.

       2.inThree-phase asynchronous motorIn the control loop of the inverting power supply, a speed relay is added when the sensor detects that the motor speed is0When the inverter power supply can be cut off in time. Because the speed relay of this method monitors the speed of the motor in real time, the braking effect is much better than the previous method.

       Because of this feature of reverse braking, it is not allowed to be used in reverse machinery, such as some lathes, etc., the braking method can not be used for reverse braking, but only for energy consumption braking or mechanical braking.

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