The stator adopts the combined structure of tooth and yoke, which greatly reduces the production cost

of iron core compared with the conventional segment structure;In the design of the rotor, the magnetic

steel structure adopts IPM structure. Compared with the conventional SPM structure, the cost of the

magnetic steel is reduced synchronously. Moreover, the stator and rotor punched from one die, and the

cost of a set of iron core is reduced by more than 15% compared with the previous scheme。