Feedback braking is one of the braking methods of frequency converter, and it is also a very effective energy-saving method. And avoid the damage to the environment and equipment during braking. whenThree-phase asynchronous motorWhen the rotor speed is higher than the synchronous speed of the stator magnetic field, the direction of the electromagnetic torque is opposite to the rotor steering, and the motor both returns electrical energy and generates mechanical braking torque on the shaft, that is, it runs in the braking state.
If the motor is directly connected to the power grid, it will send electricity back to the power grid, but this has a greater impact on the power grid, if driven by the frequency converter, because the frequency converter has an intermediate energy storage link, its energy storage is limitedThree-phase asynchronous motorIn the state of power generation, the inverter has a greater threat. When the inverter deals with the regenerative power generation of the motor, there are many braking methods, such as energy consumption braking, energy storage braking, feedback braking and so on.
For the energy consumption braking method, the electricity emitted by the motor will be wasted, and the energy consumption resistance will often be damaged; Energy storage braking method in the energy storage is also limited, the same threat to the inverter, energy feedback is a good way to deal with regenerative power generation, but also a good way to brake. It ensures the safety of the inverter, saves energy, and enhances the braking function of the motor.
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