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Tyler Voss Membership & Communications Specialist+1 314 993 2220tvoss@easa.com
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Tom Bishop, P.E. EASA Technical Support Specialist
There are many tests that can be performed on a DC motor to verify the integrity of windings, correct coil polarities and proper running performance. What we will address in this article are a select few simple tests that can help assure a motor operates properly when the customer applies it. Our intent is not to oversimplify and suggest that performing these tests alone is all that is required for an effective repair. Rather, the intent is to highlight some tests that give a maximum return for the time invested in testing.
The tests we will cover are drop testing fields, checking interpole polarity, checking compound field polarity, brushholder spacing, setting neutral and two-way run testing. All of these tests can usually be performed with the motor assembled, although in some cases the end bracket on the commutator end may need to be removed to access the field lead connections.
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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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