Abstract：As the key component of liquefied natural gas (LNG) pumps, the performance of submerged cryogenic motor is very important. Aiming at reducing LNG gasification capacity and improving mechanical stress, the operating characteristics of the submerged cryogenic permanent magnet synchronous motor (PMSM) in LNG (-161℃) low temperature environment were investigated. The redesign method was discussed, and the influence of low temperature on the material properties and electromagnetic parameters was analyzed theoretically. Then, a coupling finite element simulation model of multi-physical coupling of electromagnetic-fluid-heat-stress was established, and a 11kW, 6 000r/min cryogenic PMSM was designed. For security reasons, the testing device of cryogenic PMSM under low temperature condition (-196℃ liquid nitrogen) was set up, and the experimental study was carried out to verify the design methodology.
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2019, Vol. 34 
