When an electric motor works as a generator (electromotive brake), the braking resistor protects the machine from a voltage rise in the DC link. At the same time, the reduction of current leads to a speed reduction of the engine and helps to brake the machine. REO braking resistors achieve a better heat dissipation and better dynamic behaviour by filling heat conducting material surrounding the wound body. REO resistors are short-circuit proof and self-extinguishing. They guarantee a high level of operational safety and are overload-proof in case of short-term loads for your applications (e.g. wind power engineering, railway engineering and automotive engineering).
The charging resistor is a current limiting resistor for the loading and discharge of capacitors and limits for example the in-rush current that flows into the intermediate circuit capacitor. The device must be laid out for a high level of single pulse energy and nominal voltage for this purpose. The inductance of the resistor also contributes to the limiting of the in-rush current, for this reason REO wire resistors are the correct choice.
Liquid cooling is a very efficient option that can reduce construction sizes by up to 80%. Liquid cooled resistors from REO are available with capacities from 1 to 100 kW. Cooling channels incorporated into the heat sink enable efficient cooling and the spatial separation of the current-carrying and liquid-carrying pipes – safe usage is guaranteed as a result.
REO damping resistors can absorb and temporarily store higher impulse loads. Thanks to the special winding technology, the wires of the damping resistors are separated spatially and therefore ensure a higher dielectric strength.
REO damping resistors are available in the protection classes IP00 to IP 65 and provide a high level of functional safety and service life.