| 摘要 |
<p>An air cooler for an enclosed frame motor wherein two air-to-air heat exchangers are located in an enclosure mounted above an opening in the frame. The heat exchangers are disposed so that the heat exchanger coolant tubes extend transversely to the longitudinal axis of the motor drive shaft. The heat exchangers are positioned at opposed ends of the motor and inclined toward one another in an A-shaped configuration. The enclosure forms an enclosed region with the frame, isolating motor air inside the region from ambient air outside the region. An intake plenum is coupled with the enclosure on one side to direct ambient air into the interior of the heat exchanger coolant tubes at one end, whereby the ambient air exits from the tubes at the other end. Motor air surrounding the motor is heated during operation and circulated by an internal fan among the heat exchangers. The motor air is cooled to a substantially uniform temperature and returns on each opposed end of the motor with minimal temperature differential at the ends. The increased number of coolant tubes and their shorter length reduce external pressure drop through the tubes and permit greater efficiency of the fan used to direct ambient air through the interior of the tubes. Utilization of twisted coolant tubes in the heat exchanger, instead of conventional round tubes, can further increase efficiency. Alternatively, a plate-type air-to-air heat exchanger may be employed.</p> |
