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Cryogenic motors, as one of the key components of submerged liquefied natural gas (LNG) pumps, have gradually attracted the attention of researchers with the vigorous development of LNG industry. In this paper, the design, performance analysis, and experiment of a submerged cryogenic permanent magnet synchronous motor (PMSM) are investigated. Considering the effect of cryogenic temperature on material properties, the cryogenic temperature design method is proposed, and on this basis, an 18.5-kW cryogenic PMSM is designed. Then, the finite-element method is used to analyze the motor performance. The analysis is focused on the comparison of electromagnetic characteristics at two different cryogenic temperatures. A multiphysical field model coupling with electromagnetic, fluid, thermal, and stress is established and simulated, and the analysis results proved the rationality of the design. Finally, a prototype was fabricated and tested, providing measurement results that show a stable operation of the motor, which validated the theoretical design and analysis. [ABSTRACT FROM AUTHOR]

This paper presents the design of cryogenic permanent magnet synchronous motor (C-PMSM) for submerged liquefied natural gas (LNG) pump. The motor is submerged in LNG with a cryogenic temperature (CT) of −161 °C, and its magnetic and electric characteristics differ greatly from that of the motor at room temperature (RT). So it is necessary to redesign according to the result of conventional design, considering the changes of materials under the cryogenic environment. The operating characteristics of the C-PMSM are investigated, and the redesign method is discussed. Finite-element method is used to analyze the motor performance. A prototype is fabricated and tested to verify the rationality of the design. [ABSTRACT FROM AUTHOR]

In this paper, a new modular multi-stage axial flux permanent magnet synchronous motor is proposed for the traction motor applications, which has the features of slotted north–south-pole topology, segmented and yokeless stator, ellipsoidal similar Somaloy teeth, and flexible power circuits. To minimize the cogging torque, a cost-effective asymmetrical bidirectional magnet skewing (ABMS) technique is adopted in the motor. Various ABMS combinations are studied with different skew angles and cross positions. Both the theoretical analysis and finite-element method (FEM) illustrate that ABMS has both the skewing and phase shifting effects. Based on a 2 kW-1000 r/min, 10-pole 12-open-slot prototype, the experiments are developed. The results measured by experiments agree well with the ones predicated by 3-D FEM, which verifies the conclusions and design. [ABSTRACT FROM PUBLISHER]