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Most vehicles can come to a halt from any speed in less time than they take to reach it, which means that the power to be absorbed and dissipated during braking can be very high - more than the power of the vehicle's engine. One of the features of an electrically driven vehicle is that its motors can create electricity from the braking power, which to some extent can be used to recharge the batteries. But when the batteries and any other energy storage devices are fully charged, the vehicle will still need stopping capacity - and this can be provided by resistors from Cressall.
Cressall has developed a new range of lightweight and very compact liquid cooled resistors for the braking systems of hybrid and all-electric vehicles. Proposed E.U. regulations for these vehicles will require brake systems with a continuous rating: these can best be met by using specially designed brake resistors, sized to be able to absorb the vehicles regenerated braking power continuously. These modules are a fraction of the size and weight of similarly-rated brake resistors using traditional sheathed elements.
EV liquid cooled resistor modulesCressall's new liquid cooled resistors convert excess electricity into heat that can be safely dissipated in the vehicle's existing liquid cooling system. The patented system totally separates the resistor elements from the coolant and deliver maximum thermal conductivity with maximum electrical insulation. The individual 25kW modules are designed to plug together to handle higher powers. The EV resistor is compact, light and completely recyclable.
Advanced materials ensure high performance and reliability. The new EV range has been successfully vibration tested to automotive vibration specifications. Because it has no ambient temperature limits it can be mounted wherever appropriate in the vehicle's coolant system.
The new EV resistor range is just the latest example of Cressall's commitment to advancing electrical braking technology. Our resistors are used in regenerative and dynamic braking for locomotives, metros and mass transit systems, trams, buses, cranes, ships and oil rigs. They are expected to handle the harshest environments with minimum maintenance, so you can be sure that everything we make is made to last.
As well as producing our own technologies for the next generation of green vehicles, we can supply the equipment you need to develop and test your own prototypes.
Protean have made extensive use of Cressall's braking and load resistors to perfect their in-wheel motor designs.
Downloads: Cressall EV liquid cooled resistor datasheet
Specialist advice
Just call us on 0116 273 3633, or contact one of our distributors
Cressall Resistors Ltd, Evington Valley Road, Leicester, LE5 5LZ U.K. Tel: (+44) (0)116 273 3633