Mike Howell
EASA Technical Support Specialist

Most service centers do not routinely rewind stators in the voltage range of 11-13.8 kV (13.8 kV will be used throughout the discussion for simplicity). These machines represent a small percentage of machines repaired and typically present significant financial exposure in the event of an in-process or warranty related failure. Organizational efforts to enter this product line should be carefully planned to minimize risk to the service center and to assure customer requirements are met.

This paper, presented at the 2013 EASA Convention, presents a generic product quality planning process for industrial motor stator windings rated 13.8 kV. Emphasis is placed on analyzing gaps between a 4 kV rewind and a 13.8 kV rewind as they relate to stator winding design, insulation system validation and process control. The process analysis model considers materials, equipment, people, environment and methods.

Machines rated in the 6 kV class are excluded from the discussion with exception to a short explanation near the end of the paper providing rationale for the exclusion.

• Stator winding design
• Insulation system validation
• Process control

The process analysis model will consider materials, equipment, people, environment and methods.

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