Reverse braking belongs toAsynchronous motorA braking method, which generates the motor through the reverse phase sequence, and the reverse moment of the blocking effect is convenient for braking the motor, and the following isThree-phase asynchronous motormanufacturerMori force motor to understand it.
After the asynchronous motor is disconnected from the power supply, in order to allow the motor to stop quickly, we use the control method to add the inverting power supply that can run normally on the power supply of the motor, then the rotation direction of the rotor and the rotation direction of the rotating magnetic field is opposite, then the motor will produce electromagnetic torque, and this electromagnetic torque is the braking torque, which can speed up the deceleration of the motor.
Reverse braking has a major disadvantage at RPM0If the power supply after the reverse phase cannot be removed in time, the asynchronous motor will be reversed. So we can heat a time relay or a speed relay in the control loop of the motor inverting power supply.
The function of the time relay is to disconnect the reverse phase power supply after the reverse phase braking for a period of time to avoid the asynchronous motor reversal, but because the time is difficult to estimate, the effect is not very good; Speed relays are capable of detecting speed as0Timely cut off the inverter power supply of the motor, which requires real-time monitoring of the speed, in effect is much better than the time relay, because of the characteristics of reverse braking, in some mechanical or lathe equipment that does not allow reversal, this braking method can not be used, so the general use is energy consumption braking or mechanical braking.
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