匝间短路故障对永磁同步电机失磁的影响

Effects of Inter-turn Short-circuit Fault on Demagnetization of Permanent Magnet Synchronous Machines

永磁同步电机在不同负载和转速下,相带第一匝短路故障对永磁体失磁影响的研究。首先介绍了电机的设计参数及绕组结构,其次采用有限元法建立了永磁同步电机相带第一匝短路故障模型,再次提取了不同负载和转速下,故障电机去磁磁场、磁密云图分布和永磁体上A点磁密变化波形。结果表明电机负载和转速越大,相带第一匝短路故障对转子永磁体失磁的影响就越大,定子磁饱和也越严重。

To study the permanent magnets of permanent magnet synchronous motor（ PMSM）, under differ- ent loads and speeds, demagnetized by the short circuit fault of the first turn of the phase belt （FYPB）. Firstly, parameters and coil structure of the designed machines were introduced. Secondly, short circuit fault model of the first turn of the phase belt of permanent magnet synchronous motor was established adopting fi- nite element method. Thirdly, demagnetization magnetic field and magnetic flux density distributions of per- manent magnet synchronous motor under different loads and speeds were researched, aiming at the influences of short circuit fault of the PTPB of PMSM on loss of field of rotor permanent magnet. In addition, the occur- rence of irreversible demagnetization fault on motor rotor permanent magnet was verified by observing the fea- tures of magnetic flux waveform at point A with the change of load and speed of PMSM. Results show that the larger load and rotating speed of motor, the greater effect of the short circuit fault of FTPB on demagnetiza- tion fault on rotor permanent magnet and the more serious magnetic saturation of the core.