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Efficient Thermal Cooling Structure for a Motor

The rated output of a motor is determined based on the value of the load current at which the temperature of the motor's parts reaches the permissive limit. Especially, the temperature of the stator coil is considered in many cases. In this research, in order to attain the higher rated output of a motor, a new thermal cooling structure that decreases the rise in the temperature of the stator coil is proposed. Next, based on the proposed structure, a prototype motor was manufactured and evaluated. The results demonstrated the superior performance of the proposed structure in comparison with the conventional structure. Moreover, the press‐formed coil which is devised with the purpose of enhancing the desired effect is also explained herein.