Three-Dimensional Thermal Calculation and Analysis of A Wind Driven PMSG with Different Demagnetization Faults

o research the temperature rise of the permanent magnet generator with demagnetization faults, a 1.5 MW permanent magnet synchronous generator (PMSG) with 32 poles and 4 branches in parallel and fractional slot is investigated. The three dimensional thermal-field finite element and mathematical models of PMSG with no and different demagnetizations in rotor permanent magnet were established. The heat sources used in the thermal-field were obtained by a two-dimensional (2D) electromagnetic field analysis. The temperature field of the PMSG rotor was calculated with no demagnetization, single piece of permanent magnet demagnetization and the adjacent two pieces of permanent magnet demagnetization, respectively. The temperature distributions with three different conditions were compared and the influences of permanent magnet demagnetization on the temperature were analyzed. Using the same method, the temperature distribution of a 400W-10 poles permanent magnet synchronous was analyzed. The calculated temperature results were compared with the test values, which verify the correctness of the calculation method. The thermal calculation model can be applied to the thermal analysis of the other PMSGs. The research can provide diagnostic analysis basis for the PMSG with demagnetization faults.