Design and Analysis of a Bearing-Integrated Rotary Transformer

Xiaoou Fan, Shaohua Ma, Dezhi Chen () and Chaoqun Liu
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Xiaoou Fan: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Shaohua Ma: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Dezhi Chen: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Chaoqun Liu: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China

Energies, 2025, vol. 18, issue 15, 1-21

Abstract: In this paper, a bearing- and transformer-integrated electric excitation synchronous motor excitation system (bearing-integrated rotary transformer) is proposed to support the motor rotor and energy transmission of excitation systems. Firstly, the working principle of the bearing-integrated rotary transformer is discussed. Secondly, the structure and electromagnetism of the bearing-integrated rotary transformer are designed through the processes and principles of pole slot matching, stator/rotor size, winding, and the magnetic regulating needle. Thirdly, the bearing-integrated rotary transformer undergoes an electromagnetic–thermal simulation. Finally, a prototype of the bearing-integrated rotary transformer is manufactured, and the electromagnetic and transmission characteristics are tested, verifying the correctness of the proposed scheme and providing additional ideas for the improvement of synchronous motor excitation systems.

Keywords: integrated bearing; rotary transformer; excitation system; electrical excited synchronous motor (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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