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Open AccessArticle

Modified Slot Opening for Reducing Shaft-to-Frame Voltage of AC Motors

by Manje Yea 1 and Ki Jin Han 2,*
School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
Division of Electronics and Electrical Engineering, Dongguk University, Seoul 04620, Korea
Author to whom correspondence should be addressed.
Energies 2020, 13(3), 760;
Received: 3 January 2020 / Revised: 5 February 2020 / Accepted: 6 February 2020 / Published: 9 February 2020
This paper presents a method to reduce the winding-to-rotor capacitance of electrical machines for the purpose of suppressing shaft-to-frame voltage, which causes reliability issues, such as electromagnetic interference (EMI) and bearing current. The proposed method is based on the modification of slot opening shape of the stator core, including the variation of slot opening width and the use of oblique slot opening. For the verification of the suggested method, six different slot opening shapes, including a reference design, are analyzed and compared using finite element analysis, and the results show that the proposed method can reduce the shaft-to-frame voltage by 98%, compared to the reference design. View Full-Text
Keywords: shaft voltage; bearing current; electrical machines shaft voltage; bearing current; electrical machines
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Yea, M.; Han, K.J. Modified Slot Opening for Reducing Shaft-to-Frame Voltage of AC Motors. Energies 2020, 13, 760.

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