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What is the energy consumption braking process of a three-phase asynchronous motor?

What is the energy consumption braking process of a three-phase asynchronous motor?

What is the energy consumption braking process of a three-phase asynchronous motor?

The energy consumption braking control of the three-phase asynchronous motor is a common control method, the working principle of the energy braking, the control process, and the mechanical characteristics of the energy braking are further elaborated. The principle of energy consumption braking and the principle of control of the three-phase motor's energy consumption braking, the original motor is connected to the grid to run in the forward electric state, its speed is n, the stator of the running motor is braked The three-phase AC power supply is disconnected and a direct current is passed into the stator windings such that a DC current flowing through the stator windings creates a fixed, non-rotating, spatial magnetic field in the air gap of the motor. At the moment after the power is cut off, the rotational speed of the motor rotor cannot be abrupt due to the inertia, so the relative spatial magnetic field generated by the direct current is a rotating magnetic field with respect to the rotational speed. The rotation speed of the rotor is n counterclockwise. When standing on the rotor, the constant spatial magnetic field rotates clockwise, and the rotation speed is also n. Just as the motor runs in the electric state, the rotor and the space magnetic field have relative motion. An induced electromotive force E and an induced current I are generated in the winding. The rotor current I interacts with a constant spatial magnetic field to generate an electromagnetic force and an electromagnetic torque Te. The direction of the electromagnetic torque Te is opposite to the direction of the rotor speed, and the motor enters a braking state. Under the action of Te, the rotation speed of the rotor is reduced. If the motor is dragged by the directional load, the speed of the motor is quickly reduced to zero.

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