Abstract:
High speed permanent magnet synchronous motor for Hydrogen fuel has high loss, and its temperature rise is related to the coupling of high-speed AC (Alternating current) steady electromagnetic field, flow field and temperature field, which makes it difficult to predict its temperature rise. On the basis of deriving the two-dimensional electromagnetic field control equation of a high-speed permanent magnet synchronous motor using the Maxwell's equations, this paper uses the Bertotti iron loss discrete model to calculate the motor iron loss, introduces the Reynolds coefficient to calculate the wind friction loss, uses the classical calculation formula to calculate the winding copper loss and eddy current loss, and converts the loss value into a volumetric heat generation rate applied to each heating component of the motor as a heat source for temperature field analysis. Considering the temperature variation characteristics of materials and the anisotropy of thermal conductivity of stator amorphous alloy, a temperature rise prediction model of high-speed permanent magnet motor is established by using the fluid solid coupling method. Based on the established model, numerical analysis was conducted using Maxwell and Fluent software to study the effects of air gap slot width, slot shoulder height, and air gap length on the magnetic field and temperature field of the motor. The influence curve was drawn, and it was found that the air gap slot width had a small impact on the magnetic field of the motor. Increasing the air gap slot width appropriately was beneficial for motor heat dissipation, providing theoretical support for electromagnetic field analysis and temperature rise prediction of high-speed permanent magnet synchronous motors.