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Angular contact bearings are less common than the standard radial ball bearings. Therefore, it is easy to miss important characteristics that impact performance.
Vertical motors differ from horizontal motors in numerous ways, yet some view them as “just a horizontal motor turned on end.” The obvious differences are the (usually) thrust bearings, with arrangements varying from single- to three-thrust bearings with different orientations suited for specific load, rpm and applications. Less obvious differences are in the ventilation arrangements, shaft stiffness, degrees of protection and runout tolerances. This recording will cover those topics.
This article looks at the factors that go into determining how often a motor should be lubricated and how much lubricant they should recieve.
Las consideraciones para la cantidad y la frecuencia de lubricación de los rodamientos de motores eléctricos ( y generadores) incluyen lo siguiente:
Dado que la lubricación con grasa de cojinetes de deslizamiento es muy rara, este tema no se incluye en este artículo. Además, ya que los rodamientos sellados no se pueden relubricar, este tema tampoco está incluido.
Considerations for lubrication frequency and quantity for electric motors (and generators) include the following:
This article addresses the above by breaking them down into the following categories:
This presentation covers:
Two case histories point out the need for caution when working with metal sprayed shafts:
Bearing construction is a key difference between vertical motors and horizontal motors that are mounted vertically. Vertical motors typically drive pumps using thrust bearings. Horizontal motors rarely have those types of bearings. Understanding relevant construction and configuration factors is crucial when confronting lubrication-related issues that can be associated with vertical-motor bearings.
Electrical bearing damage has become a very common issue in electric motors. This is not a new problem, but awareness has put the spotlight on this important reliability factor and industry has stepped up to deal with it.
Rolling-element bearing construction has become a very precise and exacting process. Studies have shown that more than one-half of motors that come to service centers are because of worn out or failed bearings. This is understandable since this component is subject to wear and sometimes abuse. Bearing manufacturers are called upon to improve the quality and reliability of their product to increase the time in service before it becomes necessary to replace the bearings. Proper application and maintenance of the bearing is also a key to improved reliability. This article looks at some of the components used to better understand what applications can be accommodated.
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 2021
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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