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This paper presents an explicit criteria for reluctance torque utility of permanent magnet (PM) motors. The criteria can be quantified by PM flux linkage Ψp of stator phase windings, and current I, as well as direct- and quadrature-axis inductance Ld and Lq. Through both theoretical formula and experiments, it is proved that the motor with large Ψp can utilize little reluctance torque even if the...
This paper presents two types of prototype motors for line-starting permanent magnet motors; one is a non-salient- pole machine, and the other is a salient-pole machine. Through both the analyses and the experiments, it is proved that the reluctance torque utility boosts up not only the steady-state characteristics but also the line-starting capability. It is also noteworthy that in the steady-state...
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