The electrical energy generated during the power generation process of the traction machine needs to be processed in a timely manner, otherwise it will cause serious harm to the traction machine.The method of conventional frequency conversion elevators to handle this part of the electrical energy is to install a brake unit and a brake resistor at the DC capacitor terminal. When the voltage across the capacitor reaches a certain value, the brake unit moves, and the excess electrical energy is converted into heat energy through the brake resistor and dissipated into the air.
