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Basic electric motor bearing types, loads and applications

  • January 2006
  • Number of views: 12636
  • Article rating: 4.7

Cyndi Nyberg
Former EASA Technical Support Specialist

There are two main types of load that act on the bearings of a motor – radial and axial.

  • Radial – A radial load is defined as a load that is applied perpendicular to the shaft. An example of a radial load would be an overhung load, such as with a sheave.
  • Axial – An axial load, also referred to as thrust, is a load that acts parallel to the shaft on which the bearing is mounted. Just the rotor weight of a vertically mounted motor will cause a downward axial load on the bearing.

The type and magnitude of the load will determine what type of bearing should be used in the application. If the wrong type of bearing is used, it could lead to a motor failure in a short period of time.

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Getting The Most From Your Electric Motors

Getting The Most From Your Electric Motors - coverThis 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.

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EASA/AEMT Rewind Study

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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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ANSI/EASA AR100-2020

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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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EASA Technical Manual

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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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