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Vertical motors can be identified by their capacity for an external thrust load. One common application with this factor is vertical pumps. The thrust load applied is the sum of the weight of the pump line shaft, the column of water in the casing that is being lifted, the weight of the pump impeller and the thrust produced by the pump’s volutes which forces the water to move upward. The distance between the motor and the impeller can be very short such as pumping from a tank at or above ground level to lifting water from a subsurface aquifer several hundred feet deep. In the latter example, the combined weight of the thrust load can be thousands of pounds (kilograms). The motor must then have a bearing design capable of these loads utilizing thrust bearings.
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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 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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