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The hottest spot temperature exists in the end-winding of the motor. Therefore, effectively reduce the winding temperature becomes the key of the thermal design. Direct cooling means that the coolant directly contacts with the stator and winding. It provides very efficient cooling. In this paper, a motor cooled only by water is reformed into a motor cooled by both water and oil. The experiments are...
For gaining an effective cooling performance for motor, water cooling is commonly utilized. But as the requirement for power density increasing, solely the water cooling is not sufficient. This is duo to the thermal resistance of the end winding to the water is large. To obtain lower temperature of the end winding, a new cooling method is studied. The stator and the rotor are separated by an ultrathin...
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