Thermofluidic analysis of interior permanent magnet synchronous motors with internal air circulation by protrusion-shape
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DOI 10.1007/s12206-020-0734-y
Journal of Mechanical Science and Technology 34 (8) 2020 Original Article DOI 10.1007/s12206-020-0734-y Keywords: · Thermofluidic analysis · Effective thermal management · Internal air circulation · IPMSM motors · Protrusion-shaped flow inducers
Correspondence to: Sukkee Um [email protected]
Thermofluidic analysis of interior permanent magnet synchronous motors with internal air circulation by protrusion-shaped flow inducers for effective thermal management Jonghyo Lee1, Namkwon Lee1 and Sukkee Um2 1
Graduate School, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea, Division of Mechanical Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
2
Citation: Lee, J., Lee, N., Um, S. (2020). Thermofluidic analysis of interior permanent magnet synchronous motors with internal air circulation by protrusion-shaped flow inducers for effective thermal management. Journal of Mechanical Science and Technology 34 (8) (2020) 3415~3426. http://doi.org/10.1007/s12206-020-0734-y
Received December 24th, 2019 Revised
May 31st, 2020
Accepted June 10th, 2020 † Recommended by Editor Yong Tae Kang
Abstract
A three-dimensional thermofluidic model was developed for simulating fluid flow and heat transfer in interior permanent magnet synchronous motors (IPMSMs) with internal air circulation for effective thermal management. Protrusion-shaped flow inducers were introduced to facilitate the internal air circulation through rotor ventilation holes, increasing convection and preventing temperature rises in primary motor components. The numerical model agreed well with the experimental data. Subsequently, various geometrical design variables of the protrusion were selected to determine the thermofluidic characteristics of the electric motor associated with local temperature distributions for critical motor components. The protrusion increased the mass flow into the ventilation holes; accordingly, the maximal rotor temperature was inversely proportional to the protrusion design. Additionally, a thin airgap between the stator and rotor affected the radial heat transfer rate by forming additional thermal resistance layers. This flow was modeled using the Taylor-Couette paradigm, with the relative error under 1 %.
1. Introduction
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Electric motors for vehicular applications generate significant amounts of heat owing to various energy losses in primary motor components (e.g., rotors and motors). As a result, conventional motor cooling systems may not be able to constrain temperatures in high-power motors to be maximal temperature limits for continuous operation. Maximal motor temperatures may exist in either rotors or stators, which strongly depend on the motor operating conditions [1]. Low-power (i.e., < 10 kW) electric motors in general require no additional heating for long-term operation, owing to the relatively small amounts of dissipated heat
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