Abstract
This paper presents an axial-radial air cooling system for the 315kW, 6kV solid rotor permanent magnet synchronous motor, to reduce the working temperature rise of the solid rotor whist benefit its good line-starting performance. Based on the computational fluid dynamics theories, the heat transfer and temperature distribution in motor is investigated via the fluid thermal coupled analyzing. The flow pattern of the fluid flowing in the stator and rotor radial ventilation ducts are researched, and the influences of rotor axial-radial ventilation system on machine working temperature distribution are studied. Both the calculated and tested results show that such axial-radial ventilation structure could reduce machine temperature rise, especially that in rotor, effectively.
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