The Investigation of Motor Cooling Performance

Authors: Chih-Chung Chang, Sy-Chi Kuo, Chen-Kang Huang, Sih-Li Chen

Abstract:

This study experimentally and numerically investigates motor cooling performance. The motor consists of a centrifugal fan, two axial fans, a shaft, a stator, a rotor and a heat exchanger with 637 cooling tubes. The pressure rise-flow rate (P-Q) performance curves of the cooling fans at 1800 rpm are tested using a test apparatus complying with the Chinese National Standard (CNS) 2726. Compared with the experimental measurements, the numerical analysis results show that the P-Q performance curves of the axial fan and centrifugal fan can be estimated within about 2% and 6%, respectively. By using the simplified model, setting up the heat exchanger and stator as porous media, the flow field in the motor is calculated. By using the results of the flow field near the rotor and stator, and subjecting the heat generation rate as a boundary condition, the temperature distributions of the stator and rotor are also calculated. The simulation results show that the calculated temperature of the stator winding near the axial fans is lower by about 5% than the measured value, and the calculated temperature of the stator core located at the center of the stator is about 1% higher than the measured value. Besides, discussion is made to improve the motor cooling performance.

Keywords: Motor cooling, P-Q performance curves, CNS, porous media.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1058601

References:

[1] Bleier, P. Frank, "Fan handbook: selection, application, and design", McGraw-Hill, New York, 1997.
[2] Dr. Ing. BRUNO ECK, "FANS", Pergamon Press, New York, 1973.
[3] A.B. Mckenzie, "Axial Flow Fans and Compressors", Public by Ashgate Publishing Limited, 1997.
[4] T. Fukano , Y. Takamatsu and Y. Kodama, "The effects of tip clearance on the noise of low pressure axial and mixed flow fans", Journal of Sound and Vibration, vol. 105, no.2, 1986, pp.291-308.
[5] C. William, Osborne, "FANS", Pergamon Press, New York, 1977.
[6] L. Kondo and Y. Aoki, "Noise Reduction in Turbo Fans for Air Conditioners", Technical Review-Mitsubishi Heavy Industries, vol. 26, no. 3, October 1989, pp. 173-179.
[7] Mazurkiewicz, John (Baldor Electric), "Motor temperature", Motion System Design, vol. 45, no. 4, April, 2003, pp. 20-24.
[8] A. Fasquelle, (CNRT Futurelec, Laboratoire de Mecanique et Energetique, Laboratoire d'Electrotechnique et d'Electronique de Puissance); D. Saury; S. Harmand; A. Randria,; B. Boualem, "Numerical study of fluid flow in an enclosed electrical motor", Proceedings of ASME Fluids Engineering Division Summer Meeting 2006, FEDSM2006, vol. 1 SYMPOSIA, Proceedings of ASME Fluids Engineering Division Summer Meeting 2006, FEDSM2006, 2006, pp. 149-156.
[9] C.M. Liao, C.L. Chen, and T. Katcher, "Thermal Management of AC Induction Motors Using Computational Fluid Dynamics Modeling", IDMDC-99, Seattle, Washington, 1999, pp. 189-191.
[10] Y.C. Chen, (Applied Computational Physics, Rockwell Scientific Company); B.C. Chen; C.L. Chen; J.Q. Dong, "CFD thermal analysis and optimization of motor cooling fin design", Proceedings of the ASME Summer Heat Transfer Conference, vol. 3, Proceedings of the ASME Summer Heat Transfer Conference, HT 2005, 2005, pp. 625-629.
[11] C.M. Liao, (Rockwell Science Cent); C.L. Chen, "Thermal analysis and design for power electronics of integrated motor", Proceedings of SPIE - The International Society for Optical Engineering, vol. 3906, 1999, pp. 408-414.
[12] C.M. Liao, (Rockwell Science Cent); C.L. Chen; Katcher, Tom, "Thermal analysis for design of high performance motors", Thermomechanical Phenomena in Electronic Systems -Proceedings of the Intersociety Conference, 1998, pp. 424-429.
[13] M. Wu, (National University of Singapore); A.O. Andrew Tay; M.A. Jabbar, "Determination of thermal performance of small electric motors", Proceedings of the International Conference on Power Electronics and Drive Systems, vol. 2, 2001, pp. 877-880.
[14] http://www.flow3d.com
[15] http://www.Fluent.com