Work

Development of a coefficient of performance to evaluate the oil cooling methods in electric vehicle motors

Year: 2025

Type: article

Abstract: This study developed performance coefficients to evaluate oil cooling in electric vehicle motors. The coefficients, incorporating oil flow field, heat removal capacity, and temperature as input parameters, are used to optimize motor cooling conditions. The flow field coefficient, defined by comparing dripping and churning oil volumes, was influenced by flow complexity and improved by 85 % at higher coolant flow rates, lower rotor speed, and lower inlet oil temperature. The heat removal capacity coefficient, representing the ratio of cooling capacity to heat generation, increased up to 70 % with colder oil supply. The overall cooling performance coefficient, combining flow field and heat removal effects, showed a 55 % performance increase by enhancing the flow field and a 74 % increase by improving heat removal. Thus, inlet temperature adjustment proves to be the most effective temperature management strategy. The proposed coefficients provide a framework for optimizing motor cooling performance.

Source: Case Studies in Thermal Engineering

DOI: 10.1016/j.csite.2025.106194

Authors: Taeyoung Beom, Youngkyo Kim, Tae Wook Ha, Sung Wook Lee, In Guk Hwang, Dong Kyu Kim

Institutions: Chung-Ang University, Hyundai Mobis (South Korea), National Institute of Standards and Technology

Language: English

Topic: Electric Motor Design and Analysis

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: gold

Estimated APC paid: $1,620