Temperature Field of Demagnetization Fault in Permanent Magnet Synchronous Generator

Abstract

Permanent magnet synchronous generator (PMSG) is widely used in wind power generation systems. However, the temperature of the PMSG may change due to the demagnetization fault of permanent magnets. This paper discusses the loss of heat source distribution for the PMSG, analyzes the thermal conductivity of relevant materials, and determines the boundary conditions for modeling. Then, a three-dimensional (3D) temperature field calculation model was established for the PMSG under demagnetization fault, according to thermal principles and fluid theorems. With the aid of the model, the authors obtained the temperature variation of stator windings, stator cores, and permanent magnets with different demagnetization degrees in different locations. After that, an experimental platform was set up for the PMSG temperature variation under demagnetization fault, and a temperature rise experiment was conducted to verify the effectiveness of our temperature field calculation model and the correctness of the temperature field variation law.