科研之友
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摘要
The internal cooling system of stator yokeless axial flux motor has eddy current loss, which leads to the reduction of motor efficiency and temperature increase. In this paper, a cooling system of a stator yokeless axial flux motor is modeled with a vehicle hub motor as the research object. Through simulating and analyzing the eddy current loss of the cooling system during the operation of the motor, and performing two-dimensional finite element equivalence of the motor, the mechanism of eddy current loss of fins is further investigated. Based on this, the eddy current loss is optimized from three different perspectives, namely, optimizing the stator tooth shape to reduce the magnetic field strength at the fins, optimizing the fin height through magneto-thermal coupling analysis, and slotting the fins to increase the eddy current path resistance, which finally reduces the eddy current loss to 32.7% of the original one. The experimental tests of the prototype are carried out. The results show that the finite element simulation and experimental test results are consistent and the efficiency of the optimized motor is improved at different speeds, with the efficiency of the optimized motor 3.1% higher than that of the unoptimized motor at 4 000 r/min. ? 2021, Society of Automotive Engineers of China. All right reserved.
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