Braking resistor in rolling stocks [trains, locomotives, buses, subway] is used to reduce braking energy, the excess of which can not be returned to the power network.
Frame Motors speed control through frequency converters – inverters is a widely used method of controlling drives. One of their advantages is the return of energy during braking. In such situation the motor works as an electric generator, returning current to the power network. In many situations, however, the braking current may exceed the critical value and damage the DC circuit elements of the inverter. Then, a braking resistor is used that dissipates excess energy, converting it into heat. It is activated by the chopper during braking of the traction unit.
Today, braking resistors are used for increasing power of traction units, with a clear reduction in their dimensions and own weight. The design and quality of contemporary braking resistors enables long and failure-free operation with minimum maintenance requirements. [see "Quality"].
Braking resistors made by SIMPAX for rolling stocks are used in national and international transport industry for over 30 years [see "History"]. For the production of braking resistors SIMPAX applies the latest technologies that meet the highest requirements of the transport sector in terms of quality and durability, and advanced 3D modeling, thanks to which we can design any type of resistor corresponding to individual requirements in a short time.
The offer of SIMPAX braking resistors, depending on the place of assembly on the traction unit, includes:
- braking resistors for use on the roof of a traction unit
- braking resistors for use under the vehicle
- resistors for use inside the vehicle
- replacement of resistors for older type traction units