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Novel synchronous machine with permanent magnet in stator yoke

A novel 6/7 stator/rotor pole biased flux permanent magnet machine with auxiliary teeth (AT-BFPMM) is proposed in this paper. The stator of new machine is constituted by two types of T-shaped lamination segments sandwiched with circumferentially magnetized permanent magnets (PMs) and the rotor is identical to that of switched reluctance machines (SRMs). The magnetization direction of PMs on both sides of teeth with armature winding is inversed, while it is not on both sides of auxiliary teeth. Comparative study based 2-D finite element analysis (FEA) between the proposed machine and the original biased flux permanent magnet machine (ORI-BFPMM) with the same outside radius and axial length is also presented in this paper. It indicates the AT-BFPMM has much higher power factor, stronger overload capability, lower torque ripple, and lower loss than those of ORI-BFPMM.