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2022

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09

Regenerative resistance is what we often call braking resistance

Category:


【Summary】Regenerative resistance is the internal circulation word of Taiwan-funded enterprises at first, and now it has become a common word in the inverter industry and the server industry

Regenerative resistance is the internal circulation word of Taiwan-funded enterprises at first, and now it has become a common word in the inverter industry and the server industry


In fact, the regenerative resistance is in the system where the frequency converter drives the motor. The motor speed reduction and shutdown are realized by gradually reducing the frequency. At the moment of frequency reduction, the synchronous speed of the motor stator decreases, while the rotor speed of the motor remains unchanged due to mechanical inertia. When the synchronous speed of the stator is less than the rotor speed, the phase of the rotor current changes almost 180 degrees, and the motor changes from the electric state to the power generation state; At the same time, the torque on the motor shaft becomes the braking torque, which causes the speed of the motor to drop rapidly and the motor is in the regenerative braking state. The electric energy generated by the motor is fed back to the DC circuit after full wave rectification by the freewheeling diode. Since the electric energy of the DC circuit cannot be fed back to the power grid through the rectifier bridge, it is only absorbed by the capacitance of the inverter itself. Although other parts can consume electric energy, the capacitance still has a short time of charge accumulation, forming a "pumping voltage", which increases the DC voltage. Too high DC voltage will cause damage to all components. Therefore, necessary measures must be taken to deal with this part of regenerative energy when the load is in the state of power generation braking. The braking resistance is to consume the regenerative energy of the motor in the form of heat energy to protect the safety of the equipment.


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