Chuck Yung
EASA Technical Support Specialist

Note: This article was originally published October 2001 and was updated September 2021.

When rewinding a motor, the service center is restricted by the original design. Sometimes, we encounter a motor design we wish had never been developed. The random-wound, 2300-volt motor design falls into that category. Most of us would prefer to see medium voltage (2300-4160 volt) machines built exclusively using form coils. The form coil winding assures uniform volts/turn stresses, and reliably seals the windings against hostile environments.

From the manufacturer’s perspective, a random-wound, 2300-volt motor represents a substantial reduction in manufacturing cost. And competitive pricing is important if they want to sell motors. The great challenge to the service center is in successfully rewinding this design while maintaining profit.

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Categories: AC motors, Stators/windings, Random wound, Winding insulation, Repair procedures & tips

Tags: Insulation Partial discharge Voltage stresses

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