Abstract
This paper investigates the themal characteristics of a slotless high-speed permanent magnet synchronous motor (HSPMM) for air compressor of fuel cell system. The losses of each key components were studied thoroughly. Based on the computational fluid mechanics (CFD), a 3-dimensional fluid-structure coupled temperature field model was established, and the equivalent thermal conductivity coefficient of the gramme-ring windings constructed by litz wires was analyzed. Based on the above analysis models, the characteristics of the temperature field was analyzed. The hot spot occurs in the position of inner windings close to the airgap. To enhance the cooling of the windings, a novel cooling structure with good thermal-conductivity non-magnetic filler mounted between the slotless windings was proposed. Consequently, the highest temperatures of the different parts of the motor are all reduced.
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