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Tyler Voss Membership & Communications Specialist+1 314 993 2220tvoss@easa.com
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Tom Bishop, P.E. EASA Senior Technical Support Specialist
We in the apparatus repair business don’t always realize how global our work is until a customer sends in a motor to be redesigned for use on a different frequency. The most common frequency conversion requests are between 50 and 60 hertz (Hz). Motors intended for use in North America typically are rated at 60 Hz, whereas most of the remainder of the globe uses 50 Hz.
The speed of a three-phase motor is determined by the number of poles and the frequency. As much as we are aware of this relationship, it remains a mystery to most end users. How often have you had a customer simply request changing a 4-pole motor from 50 to 60 Hz? They want to maintain the speed at about 1500 rpm. Not only is it impossible, there are other considerations related to the type of load that must be taken into account.
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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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