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Airflow Cooling Mechanism for High-Power-Density Surface Mounted Permanent Magnet Motor
  • Flavis Akawung Awungabeh,
  • John Ebot Besong,
  • Fujimoto Yasutaka
Flavis Akawung Awungabeh
Yokohama National University

Corresponding Author:[email protected]

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John Ebot Besong
Yokohama National University
Fujimoto Yasutaka
Yokohama National University


Heating is a common problem in electric machines and cooling of small size machines is very challenging. Nowadays, the application of these machines in the actuation of weight-critical mechatronics systems is increasing. In this paper, a cooling mechanism for such electric machines with surface permanent magnet (SPM) is proposed. The mechanism is based on the fan-cooled air conditioning system except that no external impeller is needed. It has an air-inlet structure which comprises a set of six holes shrouded within a hollow cylindrical ventilation duct at the rear end of the rotor. The cooling mechanism is evaluated in a high-power-density SPM motor. The airflow rate is analyzed by developing a theoretical model using flow resistance network technique. Further verification of the airflow rate was performed with numerical computational fluid dynamics (CFD) simulation. With a discrepancy margin within 5.0%, both flow resistance network and CFD models show that the system generates a total flow rate of 118.0 L/min at maximum rated speed of the motor. Also, steady state thermal analysis of the motor using lumped parameter thermal network (LPTN) is verified in comparison with CFD simulation, which shows the cooling system maintains the motor temperature within operating range during high-speed operations.
19 Mar 2024Submitted to TechRxiv
29 Mar 2024Published in TechRxiv