Abstract

Direct loading test are the general test method to obtain running performance of induction motors. However, direct loading test is difficult to test cryogenic induction motors for submerged liquefied natural gas (-162°C, LNG) pumps because the motors are installed inside the LNG pumps and share the shaft with the pump. This paper presents a semi-static methodology that can successfully predict the running performance of a 15kW cryogenic induction motor for LNG pumps. The methodology combines a static double-frequency test with a rotating no-load test, based on a Г-equivalent circuit model, to calculate the running performance of the 15kW motor in liquid nitrogen (-196°C, LN). Experimental validation of the methodology is provided by direct loading test in LN. Finally, the methodology is used to predict the performance of the motor in LNG.

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