摘要： 内置式永磁同步电机d、q轴磁路不对称产生的磁阻转矩有助于提高电机的过载能力和功率密度，为减少漏磁，转子隔磁桥尺寸较小，但过小的隔磁桥在高速旋转时，隔磁桥强度能否满足要求是保证电机安全运行的关键。本文针对常见的三种内置式转子结构，用有限元法计算不同隔磁桥厚度对电机电磁性能及转子应力的影响规律，并对带辅助隔磁桥“V”形转子隔磁桥厚度进行优化计算。结果表明，带辅助隔磁桥“V”形转子的内置式永磁同步电机能够兼顾电磁性能和结构强度，因此更适合高速运行。

关键词：永磁电机；有限元；结构强度；电磁性能
Abstract: As the Interior Permanent Magnet Synchronous Motor′s (IPMSM) direct-axis and quadrature-axis magnetic circuits asymmetry, the reluctance torque is helpful to improve the motor′s overload capacity and power density. In order to reduce the magnetic leakage, the bridge is designed very small. When the motor works in the high speed operation, the bridge′s strength is the key to ensure the motor operate safely. The paper aimed at three kinds of interior permanent magnet rotor structure, at different bridge′s size, using FEM to calculate the effect of magnetic property and the stress distribution, and optimized the auxiliary bridge′s "V" shaped rotor′s bridge size. The results show that, the auxiliary bridge′s V shaped rotor′s IPMSM can take account of the electromagnetic properties and structure strength simultaneously, so it can be more suitable for high speed operation

Key words: permanent magnet motor；FEM；structural strength；magnetic property