Liquid cooling analysis of series parallel hybrid flow channel of permanent magnet synchronous motor casing

DOI:	10.11809/bqzbgcxb2024.02.014
Keywords:	permanent magnet synchronous motor; motor case; series parallel hybrid cooling channel; series channel; cooling; pressure loss of cooling water
Abstract:	In view of the excessive pressure loss of cooling water with the permanent magnet synchronous motor cooled by water with series flow channel in the motor case, a novel type of series parallel hybrid channel in the motor case is proposed. The heat dissipation of a 42 kW vehicle permanent magnet synchronous motor was calculated. The maximum temperature and cooling water pressure loss were compared between the motor cooled by water with the series parallel hybrid channel and the cooled by water with the series channel in the motor case. The influences of number of annular channels, groove depth of the series parallel hybrid channel in the motor case and cooling water flow rate on the cooling and heat dissipation of the motor were analyzed. The results show that the cooling water pressure drop between the inlet and the outlet with the series parallel hybrid flow channel is reduced by 26 693 Pa in comparison to that with the series flow channel in the motor case, which is 67% lower than that in the series flow channel. At the same time, the maximum temperature of the motor cooled with the series parallel hybrid flow channel is 0.6 ℃ higher than that with the series flow channel, which is 0.68% higher than that of the series flow channel cooling motor. And the increase in the number of annular channel or the increase in the cooling water flow rate can strengthen the heat dissipation of the permanent magnet synchronous motor, but the cooling water pressure loss will increase. The increase of channel depth can significantly reduce the pressure loss of cooling water; however, it has little effect on the maximum temperature of the motor.
Published:	2024-02-28
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