In the variable-frequency speed control system, the motor can decelerate or stop by reducing the frequency. In the moment to reduce the frequency, the phase position of rotor current changes almost 180 degrees, the motor turns into electric braking from electric driving, and the regenerative energy of the motor should be converted into thermal energy and consumed by braking resistor that is installed on the DC side of current transformer. When applying to chemical, military, ship and warship and other industries, the high-power variable-frequency drive is also required to be equipped with a braking resistor for normal or emergency brake.
In the braking process of metro vehicle, light-rail train and tram car, the excessive electric energy is converted into thermal energy and consumed, so as to achieve the purpose of the safe electric braking of the vehicles. As for its working principle, when the electric energy generated by the electric braking of the vehicle cannot be stored or absorbed by the power grid, the chopped wave module is triggered and started and the electric energy can be converted into thermal energy and consumed by the braking resistor.
Installation: The braking resistor is bolted to the vehicle body, and its outline structure and installation mode depend on the vehicle structure requirements of the vehicle manufacturer.
Connection: Braking resistor is generally used in the main circuit or auxiliary circuit, or used to limit the transient over-voltage caused by idling or tripping under traction or braking condition.