OK, so as much as Mobius strips and Klein-bottles are exciting and really cool, well, we can't use them in this class because we can't define flux through them.
与Mobius带相比较，克莱因瓶同样地有趣和巧妙，我们不能使用它，因为我们不能通过它们来定义通量。
2
A permanent magnet synchronous motor (PMSM) with controllable exciting magnetic flux is presented which provides a new approach for solving the problem of flux weakening for PMSM.