The energy consumption braking control of three-phase asynchronous motor is a common control method. The following is a simple explanation of the working principle of energy consumption braking, and the control process, as well as the mechanical characteristics of energy consumption braking.
Principle and control process of energy consumption braking: principle of energy consumption braking of three-phase motor, the original motor connected to the power grid running in a positive electric state, its speed isnWhen braking, the stator of the running motor is disconnected from the three-phase AC power supply, and the direct current is circulated into the stator winding, so that the DC current flowing through the stator winding will form a fixed, non-rotating space magnetic field in the motor air gap.
At the moment after the power supply is removed, the speed of the motor rotor cannot be changed due to inertia, so the constant space magnetic field generated by the DC current is a rotating magnetic field relative to the speed.
The speed of the rotor isnWhen rotating counterclockwise, standing on the rotor, the constant space magnetic field rotates in the clockwise direction, and the speed size is alsonJust as the motor runs in an electric state, the rotor moves relative to the space magnetic field, generating induced electromotive force in the rotor windingEAnd induced current.
Rotor currentIElectromagnetic force and electromagnetic torque are generated by interaction with a constant space magnetic fieldTe, this electromagnetic torqueTeIn the opposite direction of the rotor speed, the motor enters the braking state.
inTeUnder the action of the rotor speed is reduced, if the motor is dragging a directional load, the motor speed is quickly reduced to zero.
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