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REO obtains patent for improved water cooling of chokes

22 June 2014

REO UK has obtained a patent for the water cooling and encapsulation of chokes. Used in railway, renewable and regenerative applications, the new chokes improve size and efficiency, helping customers make further energy savings.

Chokes, typically used with variable speed drives for smoothing, regulating and limiting current, provide greater control and reduced energy consumption in motor applications. The last few years have seen an industry wide shift from air cooled to water cooled chokes, as a result of their increased longevity as well as lower operating temperatures and improved return on investment.

In order to cater for the varied and demanding design and power requirements of its customers, REO has successfully obtained a patent on an improved method of water cooling and encapsulation, implemented in a range of chokes designed for various low and high power applications.

The resultant state of the art choke is fully encapsulated, with water pockets forming an integral part of the windings and of the resin based encapsulation. This makes the unit more efficient at heat management whilst simultaneously removing hot-spots. This means the choke can be designed for a smaller safety factor, as variables are better known.

A further benefit of the design is the ability to achieve a high class of ingress protection, such as IP66 certification, further widening usability. For instance, use on train locomotives is possible, where weather sealing is necessary to face the high speed and harsh conditions.

For small applications up to 30kW, REO manufactures an encapsulated and cold plate mounted choke, which includes integral coolant channels. The design is optimised to permit precisely focused pinpoint cooling and provides simple integration into existing cooling systems.

For larger, more complex applications, REO manufactures a choke with an open construction. Here, cooling profiles that are integrated in the windings are able to dissipate heat directly at the point of generation in the most efficient way possible.


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