There are four common methods for braking frequency converters.
1. Energy-saving braking: Energy-saving braking uses a chopper and a braking resistor, which is set in the DC circuit to absorb the regenerative electrical energy of the motor, so as to realize the rapid braking of the frequency converter.
2. Regenerative Braking: Regenerative braking uses active inverter technology to convert regenerated electrical energy into AC power with the same frequency and phase as the power grid, which is then fed back to the grid, thus achieving braking. Achieving energy regenerative braking requires conditions such as voltage frequency and phase control and regenerative current control.
3. DC Braking: DC braking generally refers to the process where, when the inverter's output frequency approaches zero and the motor speed decreases to a certain value, the inverter redirects DC current into the stator windings of the asynchronous motor, creating a stationary magnetic field. At this time, the motor is in a regenerative braking state, and the rotating rotor cuts through this stationary magnetic field to generate braking torque, causing the motor to stop quickly. This can be used in situations requiring precise stopping or to brake irregular rotation of the motor caused by external factors before starting.
4. DC regenerative braking: The principle of the shared DC bus regenerative braking method is that the regenerative energy of motor A is fed back to the common DC bus, and then its regenerative energy is consumed by motor B. The shared DC bus regenerative braking method can be divided into two types: shared DC equalization bus regenerative braking and shared DC circuit bus regenerative braking.
