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DC motors have been the workhorse of variable speed drives in the paper industry for many years. DC motors in paper mills are usually separately ventilated from a large common air supply. The quantity and quality of the cooling air can have a major impact on the DC motors' performance, operation, maintenance and life between overhauls. Information presented here describes cooling air considerations,...
The information presented here is generally known to dc motor manufacturers but is not common knowledge to dc motor users. As there is a necessity for the equipment to perform beyond its original specifications and adjustment, commutation issues may arise that could increase maintenance requirements or downtime. Understanding the commutation implications of reducing the motor field may direct a user...
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