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Chuck Yung EASA Technical Support Specialist
Member Question: We recently received a rotating frequency converter for repair. It appears to be a wound-rotor motor coupled to an induction motor. The drive motor is not the same speed as the wound-rotor motor. How does this work?
The rotating frequency converter is exactly as you describe. Usually the drive motor has fewer poles than the wound-rotor motor, so the wound-rotor motor is driven faster than its synchronous speed to increase the frequency of the output.
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This 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.
This booklet covers topics such as:
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The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.
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Recommended Practice for the Repair of Rotating Electrical Apparatus This is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.
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Revised May 2024 The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.
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