A test method for permanent magnet synchronous motors immersed in liquid hydrogen

Abstract

The invention provides a test method for a permanent magnet synchronous motor with internal immersion of liquid hydrogen, and belongs to the field of low temperature motor testing. The method comprises five steps of performing insulation testing in the motor assembling process, performing sealing performance testing on the motor, performing normal temperature performance testing on the motor, performing liquid hydrogen performance testing on the motor and performing liquid hydrogen reliability cumulative testing on the motor. Low temperature motor normal temperature testing and low temperature testing are combined, and motor testing and motor pump combined testing are combined so that the motor normal temperature performance, the low temperature performance and the reliability can be comprehensively assessed and verified, and the working temperature range (plus 100-minus 253 DEG C) is wide. The motor products of the existing low temperature field are basically covered by the test method under the condition that the existing low temperature field (mostly liquefied natural gas, minus 161 DEG C) motor test method is rarely reported, and the test method can be used as an important link to realize product testing of the low temperature motor so as to perform reliability assessment of the batch products.

Description

technical field [0001] The invention relates to a permanent magnet synchronous motor (hereinafter referred to as a low-temperature motor) test method for a permanent magnet synchronous motor (hereinafter referred to as a low-temperature motor) that is immersed in a liquid hydrogen medium (≈-253°C) or a liquid nitrogen medium (≈-196°C) to drive a pump in the field of aerospace or industry. Low temperature motor testing field. Background technique [0002] In recent years, my country's aerospace launch vehicle engine has carried out the development of liquid hydrogen cycle pre-cooling. The pre-cooling power element is composed of a pump and a motor. The two adopt an integrated structure scheme. The motor and the pump are coaxial, and the motor drives the pump to rotate, driving Liquid hydrogen circulates to cool the engine and its delivery systems. The motor adopts a position sensorless vector control structure, which is the first product developed in my country. [0003] At ...

AI Technical Summary

Problems solved by technology

At present, low-temperature motor products at home and abroad are mostly used in LNG pumps, that is, the motor is immersed in the liquefied natural gas medium to drive the pump. However, there are few reports on the test principles of low-temperature motors for LNG pumps. The method has not been reported

Images