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Tyler Voss Membership & Communications Specialist+1 314 993 2220tvoss@easa.com
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Chuck Yung EASA Senior Technical Support Specialist
One of the least understood parts of a DC motor is the commutator. With a little understanding and some helpful tips, commutator life can be maximized.
Commutators are made of copper bars* separated by insulation from each other and from the steel hub. Viewed from the end, each bar is wedge-shaped, tapered radially with the thickest portion towards the outside. The insulation material most often used is segment mica because it remains stable at the temperature and pressure required during assembly and operation. By alternating copper bars with mica segments, each bar is isolated electrically from the other bars. The resulting cylinder of bars and mica is mounted on an insulated steel hub.
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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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