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The field excitaion of permanent magnet synchronous motor (PMSM) cannot be adjusted, and flux weakening for permanet magnet motor is one of the hotspot issues nowadays. A new design concept of PMSM for flux weakening was presented. D-axis inductance is smaller than q-axis inductance is regarded as common sense for PM motor, but a special permanent-magnet sheath changes it. The permanent-magent sheath...
A self-adaptive passive flux-weakening permanent magnet synchronous motor (PMSM) was proposed. The magnetic conductors in the flux-weakening unit are fixed in the sliding slot at constant torque operation. The magnetic conductors begin to move outward along the sliding slot in the rotor, which can adjust the leakage flux at constant power operation according to speed automatically. The flux-weakening...
A permanent magnet synchronous motor (PMSM) with rotor embedded segmented permanent magnet was analyzed. The whole-permanent-magnet (PM) motor and the segmented-permanent-magnet motor are compared from the aspects of the no-load performance, the rated load performance and the flux-weakening performance. The analysis and the emulation by finite element method indicate the flux-weakening availability...
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