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Friction and Windage Losses

Friction and windage losses comprise bearing friction, wind friction, the motor's cooling fan load, and any other source of friction or air movement in the motor. These losses are often appreciable in large and high speed totally enclosed fan cooled motors. Friction and windage losses typically make up about 5 percent of total efficiency loss. Friction and windage losses are less problematic with the use of high quality bearings and lubricants, and improved fan designs.

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