Electromagnetic characteristics and loss analysis of cryogenic permanent magnet synchronous motor for LNG pump&nbsp;

ZHANG Shukuan, WANG Fachen, ZHANG Yusen, ZHU Jingwei

doi:10.16411/j.cnki.issn1006-7736.2025.01.011

Journal of Dalian Maritime University >

2025 , Vol. 51 >Issue 1: 102 - 111

DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2025.01.011

Electromagnetic characteristics and loss analysis of cryogenic permanent magnet synchronous motor for LNG pump

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(1. School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; 2. College of Marine Electrical Engineering, Dalian Maritime University, Dalian 116026, China)

Received date: 2020-06-05

Revised date: 2020-06-05

Accepted date: 2020-06-05

Online published: 2025-03-17

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Abstract

Permanent magnet synchronous motor (PMSM) with advantages of high efficiency, high power density and stable operation is ideal core drive component for liquefied natural gas (LNG) pumps, where its electromagnetic performance is critical in cryogenic environments. This article firstly analyses the electromagnetic properties of key materials of cryogenic permanent magnet synchronous motors under the operating environment of −161 ℃. Then, a transient electromagnetic field finite element model of a cryogenic permanent magnet synchronous motor with a rated power of 6.5 kW is established. The electromagnetic performance and losses of the motor under cryogenic and room temperature environments are studied comparatively, and the influence of permanent magnet thickness on the performance of the cryogenic permanent magnet synchronous motor is analyzed Compared with the room temperature environment, the no-load back electromotive force and electromagnetic torque of the motor increase by 8.93% and 6.03%, respectively, at the temperature of −161 ℃; the stator iron loss increases by 2.5 times, the copper loss decreases by 65.3%, and the proportion of iron loss to total electromagnetic loss significantly increases.

Key words： cryogenic permanent magnet synchronous motor; electromagnetic analysis; electromagnetic loss; LNG pump

Cite this article

ZHANG Shukuan, WANG Fachen, ZHANG Yusen, ZHU Jingwei . Electromagnetic characteristics and loss analysis of cryogenic permanent magnet synchronous motor for LNG pump [J]. Journal of Dalian Maritime University, 2025 , 51(1) : 102 -111 . DOI: 10.16411/j.cnki.issn1006-7736.2025.01.011

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