Abstract
In this paper, a direct liquid cooling method is proposed for a radial-flux permanent-magnet motor. To demonstrate the feasibility of the cooling method, a test motor with a rated output of 205 kW was designed, constructed, and tested in an actual vehicle application, an electric city bus. The energy consumption tests were conducted by applying a heavy-duty chassis dynamometer capable of simulating the inertia, weight, and road loads that the buses are subjected to in the normal on-road operation. The electricity consumption on the real bus route of the Espoo line 11 in Finland was 0.61 kWh/km. The test results of the cooling solution show that the motor is capable of meeting the most challenging requirements of the load cycle even with a full payload. The highest winding temperature rise in the test driving cycles was only 26 °C, which proves the effectiveness of direct-liquid-cooled coils in a vehicle motor.
Original language | English |
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Pages (from-to) | 86897-86905 |
Number of pages | 9 |
Journal | IEEE Access |
Volume | 7 |
DOIs | |
Publication status | Published - 2019 |
MoE publication type | A1 Journal article-refereed |
Keywords
- direct liquid cooling
- Electric machines
- permanent magnet motors
- rotating machines
- traction motors