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Case Study

Whitelegg Machines: DRB Engineering of Deeside

DRB Engineering's New Motor Repair Equipment

Established for over 70 years, Whitelegg Machines have established themselves worldwide as solution providers for all aspects of electric motor manufacturing and repairs.

Many companies rely on Whitelegg for advice as well as equipment as diverse as coil extractors and insulation cutters up to large burn off ovens and winding equipment.

Client companies such as DRB Engineering of Deeside, Flintshire have long associations with Whitelegg and a recent order of an Impregnation Tank and Curing Oven will ensure that DRB's work on a wide range of electric motors will be enhanced through the use of modern servicing equipment.

The DRB Company now incorporates the well respected electrical engineering company of Fletcher Langley, and when the recent move to a new site on the Deeside Industrial park was made a decision was taken to re-equip the factory with the most up-to-date equipment.

With a wide range of motors being repaired and serviced for industries across the North West, including paper, chemical and process, quarrying, rail and automobile, Whitelegg recognised the need for equipment that could match the variety of motors presented. These can weigh up to 10 tonnes and typically range up to 500kw.

IMPREG-M Varnish Tank:

This impregnation tank provides for a safe and clean way for motor rewind shops to impregnate coil windings. The large impregnation tank is suitable for use with a wide range of varnishes. Once the job has been lowered into the impregnation tank, the lid is closed, and the extraction system is activated to ensure any fumes are safely removed from the operator's work area. A pump is then activated, and the varnish floods the impregnation tank, completely submerging the windings. After a suitable soaking period, the pump is reversed, and the varnish is returned to the storage tank. This sealed storage tank helps to maintain the condition of the varnish.

Curing Oven:

The forced air recirculation box oven has a useable internal area of 13.2 m³, with double galvanized and fully insulated steel skin, to ensure efficient operation. The oven is fitted with an explosion relief panel for safety.

Gas was the chosen combustant with the oven, which offers adjustable curing/drying temperatures between ambient and 250˚C. Temperature control is by a process controller via thermocouples, with an audible alarm which signifies the end of the preset curing cycle. The heating cycle is automatically stopped at this time. The oven is typically used for curing or baking varnished windings, but also regularly used for drying out windings which have low insulation resistance readings, due to water ingress or dampness.