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Drive braking

Voltage-type AC-DC-AC general-purpose frequency converters undergo the following processes:

(1)Uncontrolled Bridge Rectification: The three-phase AC power supply is rectified.

(2)Filtering and Voltage Stabilization: This is achieved through electrolytic capacitors.

(3)Output Adjustable Frequency AC Power: Finally, the power is output to the motor through a passive inverter link.

These converters are used in systems such as hoists, rolling mills, large gantry planers, winding machines, and spindle drives of machine tools. Since the motor is required to operate in four quadrants, when the motor decelerates, brakes, or lowers heavy loads with potential energy, it will be in a regenerative power generation state.

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Regenerative Braking in Frequency Converters

When the output frequency of the frequency converter decreases, the synchronous speed of the motor also decreases. Due to the effect of mechanical inertia, the synchronous speed may be lower than the rotor speed at this time, causing the motor to transition from a motoring state to a power generation state, entering a regenerative braking state. The regenerative braking of the frequency converter includes several methods:

(1)Energy Dissipation Type: This method involves using a braking resistor to dissipate the regenerated energy as heat. It is suitable for applications with low regenerative energy requirements.

(2)Parallel DC Bus Absorption Type: In this method, the regenerated energy is absorbed by other loads connected to the same DC bus. This can be more efficient than energy dissipation.

(3)Energy Feedback Type: This involves converting the regenerated energy back into the power grid. It can be the most efficient method but requires additional equipment and compliance with grid interconnection standards.

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Product Category

Drive braking

Voltage-type AC-DC-AC general-purpose frequency converters undergo the following processes:

Fixde Resistors

Universal brake unit

Regenerative Braking in Frequency Converters

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