Title: Study on temperature rise and thermal deformation of rotor caused by eddy current loss of magnetic-liquid double suspension bearing

Authors: Liwen Chen; Dianrong Gao; Jianhua Zhao; Jisheng Zhao

Addresses: College of Mechanical Engineering, Yanshan University, 438 West Section, Hebei Street, Qinhuangdao, China; College of Mechanical Engineering, North China University of Science and Technology 21 Bohai Avenue, Caofeidian New Cith, Tangshan, China; Fluid Power Transmission and Control Laboratory, Yanshan University, 438 West Section, Hebei Street, Qinhuangdao, China ' College of Mechanical Engineering, Yanshan University, 438 West Section, Hebei Street, Qinhuangdao, China; Fluid Power Transmission and Control Laboratory, Yanshan University, 438 West Section, Hebei Street, Qinhuangdao, China ' College of Mechanical Engineering, Yanshan University, 438 West Section, Hebei Street, Qinhuangdao, China; Fluid Power Transmission and Control Laboratory, Yanshan University, 438 West Section, Hebei Street, Qinhuangdao, China; Jiangsu Provincial Key Laboratory of Advanced Manufacture and Process for Marine Mechanical Equipment, 666 Changhui Road, Dantu New District, Zhenjiang, China ' College of Mechanical Engineering, Yanshan University, 438 West Section, Hebei Street, Qinhuangdao, China

Abstract: Magnetic-liquid double suspension bearing (MLDSB) is composed of electromagnetic supporting system and hydrostatic supporting system. Due to greater supporting capacity and static stiffness, it is appropriate for occasion of middle speed, overloading and frequent starting. As the MLDSB works, the rotor will rotate at high speed and cut the magnetic induction line to produce eddy current loss, which will increase the temperature of rotor and lead to thermal deformation. Gaps between magnetic poles and magnetic sleeve were small, so thermal deformation of rotor has a clear impact on oil film thickness, bearing capacity and operation stability will be reduced. Therefore, simulation model of MLDSB were established, current loss, temperature rise and thermal deformation of rotor under maximum load condition were simulation. The result showed that eddy current loss (ECL) will be aggravated by the increase of coil current, number of turns of coils and rotor speed, and temperature and thermal deformation of rotor will be aggravated by ECL. The research can provide the theoretical reference for the ECL of MLDSB.

Keywords: magnetic-liquid double suspension bearing; MLDSB; eddy current loss; ECL; temperature rise; thermal deformation.

DOI: 10.1504/IJMIC.2021.121796

International Journal of Modelling, Identification and Control, 2021 Vol.37 No.3/4, pp.267 - 274

Received: 10 Oct 2020
Accepted: 31 Oct 2020
Published online: 07 Apr 2022 *

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