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Volume 10
Issue 8
10.3390/pr10081541
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Article

Calculation of Parasitic Capacitance to Analyze Shaft Voltage of Electric Motor with Direct-Oil-Cooling System

by
Chan-Ho Kim
1,
Sung-Bae Jun
1,
Han-Joon Yoon
1,
Nam-Ho Kim
1,
Ho-Chang Jung
2,
Rae-Eun Kim
3 and
Sang-Yong Jung
1,*
1
Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
2
Advanced Powertrain R&D Center, Korea Automotive Technology Institute, Cheonan 31214, Korea
3
Intelligent Mechatronics Research Center, Korea Electronics Technology Institute, Bucheon 14502, Korea
*
Author to whom correspondence should be addressed.
Processes 2022, 10(8), 1541; https://doi.org/10.3390/pr10081541
Submission received: 5 July 2022 / Revised: 29 July 2022 / Accepted: 2 August 2022 / Published: 5 August 2022
(This article belongs to the Special Issue Design, Concepts and Applications of Electric Machines)
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Abstract

In modern electric vehicles, electrical failure has become a critical problem that reduces the lifetime of traction motors. Moreover, traction motors with high-voltage and high-speed systems for a high power density have been aggravating the shaft voltage problems. This study identifies that direct-oil-cooling systems exacerbate this problem. To address this, an analytical method for calculating parasitic capacitance is proposed to determine the effects of cooling oil in a traction motor with a direct-oil-cooling system. Capacitance equivalent circuits are configured based on whether the slot is submerged in the cooling oil. In addition, an electric field decomposition method is applied to analyze the distortion of the electric field by the structure of the conduction parts in the motor. The results indicate that the parasitic capacitances of the traction motor are increased by the influence of the cooling oil resulting in an increase in the shaft voltage.
Keywords: shaft voltage; parasitic capacitance; traction motor; direct-oil-cooling system; electric discharge machining; variable frequency drive; pulse width modulation; common-mode voltage shaft voltage; parasitic capacitance; traction motor; direct-oil-cooling system; electric discharge machining; variable frequency drive; pulse width modulation; common-mode voltage

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MDPI and ACS Style

Kim, C.-H.; Jun, S.-B.; Yoon, H.-J.; Kim, N.-H.; Jung, H.-C.; Kim, R.-E.; Jung, S.-Y. Calculation of Parasitic Capacitance to Analyze Shaft Voltage of Electric Motor with Direct-Oil-Cooling System. Processes 2022, 10, 1541. https://doi.org/10.3390/pr10081541

AMA Style

Kim C-H, Jun S-B, Yoon H-J, Kim N-H, Jung H-C, Kim R-E, Jung S-Y. Calculation of Parasitic Capacitance to Analyze Shaft Voltage of Electric Motor with Direct-Oil-Cooling System. Processes. 2022; 10(8):1541. https://doi.org/10.3390/pr10081541

Chicago/Turabian Style

Kim, Chan-Ho, Sung-Bae Jun, Han-Joon Yoon, Nam-Ho Kim, Ho-Chang Jung, Rae-Eun Kim, and Sang-Yong Jung. 2022. "Calculation of Parasitic Capacitance to Analyze Shaft Voltage of Electric Motor with Direct-Oil-Cooling System" Processes 10, no. 8: 1541. https://doi.org/10.3390/pr10081541

APA Style

Kim, C.-H., Jun, S.-B., Yoon, H.-J., Kim, N.-H., Jung, H.-C., Kim, R.-E., & Jung, S.-Y. (2022). Calculation of Parasitic Capacitance to Analyze Shaft Voltage of Electric Motor with Direct-Oil-Cooling System. Processes, 10(8), 1541. https://doi.org/10.3390/pr10081541

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