Abstract：In order to study the influence of rotor structure on rotor heat dissipation for totally enclosed water-cooling high speed permanent magnet motors (HSPMMs), a 15kW, 30 000r/min high-speed amorphous alloy permanent magnet motor was taken as an example. On the basis of computational fluid dynamics (CFD) and heat transfer theory, the computation model of fluid-solid conjugate heat transfer was established, and the coupled field was calculated using finite volume method by giving fundamental assumptions and corresponding boundary conditions. The temperature distributions of each part and air flow characteristics in the motor were obtained under several conditions, that is, with and without axial ventilation holes, the combination between ventilation holes and wafters of rotor. Thereafter, the influence of different ventilation hole sizes and number on fluid and temperature field were studied. The calculated results show that the cooling condition is improved, and the temperatures of permanent magnets are reduced by introducing the rotor wind pressure parts. The temperature of permanent magnet can further decrease by increasing the area of rotor ventilation holes. At last, the temperature rise test for a 15kW totally enclosed water-cooling HSPMSM was conducted. The test data were compared with the calculated results, which validated correctness of the solution method of coupled field.
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