Theoretically, any motor will carry a higher load if more cooling air is supplied. But that air must be carefully directed. Whereas a bearing pillow block, for example, has a fairly simple external cooling surface, motor heat is generated by internal components much more complex and less easily accessible. Even in a totally enclosed machine, directing increased air flow uniformly over the entire heat-dissipating surface is seldom possible. In an open motor, air flow paths must not be obstructed. Just blowing air toward a motor can do more harm than good, by restricting the escape of warmed air from the motor interior. When adding to any machine's natural ventilation, then, be sure the extra air reaches all the intakes, without interfering with any of the discharges. Someone specifies the plant equipment; the motor manufacturer is obviously concerned; a driven machinery builder may purchase and mount the equipment; a contractor installs the ventilation system.
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