Chuck Yung
EASA Senior Technical Support Specialist
When rewinding a motor, the service center often feels restricted to 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 (Figure 1) 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. For the service center, the challenge is to successfully rewind them while providing a reliable repair.
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