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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-consuming braking control of a three-phase asynchronous motor is a common control method. The working principle and control process of energy-consuming braking, and the mechanical characteristics of energy-consuming braking are further explained. The principle and control process of energy-consuming braking The principle of energy-consuming braking of three-phase motors. It is assumed that the original motor is connected to the power grid to run in a forward electric state, and its speed is n. When braking, the stator of the running motor is driven from The three-phase AC power supply is disconnected, and at the same time, a direct current is passed into the stator winding, so that the direct current flowing through the stator winding will form a fixed, non-rotating spatial magnetic field in the air gap of the motor. At the moment after the power supply is cut off, the motor rotor cannot change its speed due to inertia. Therefore, relative to the speed, the constant space magnetic field generated by the DC current is a rotating magnetic field. The speed of the rotor is n counterclockwise, standing on the rotor, the constant space magnetic field rotates clockwise, and the speed is also n. Just as the motor runs in the electric state, the rotor and the space magnetic field have relative movement. An induced electromotive force E and an induced current I are generated in the winding. The rotor current I interacts with a constant space magnetic field to generate an electromagnetic force and an electromagnetic torque Te. The direction of this 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 pulling a directional load, the rotation speed of the motor is quickly reduced to zero.

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