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In this paper, the torque production of fractional slot concentrated winding (FSCW) permanent magnet synchronous machines (PMSM) are analyzed from the perspective of the air-gap field harmonics modulation accounting for slotting effect. It is found that the average torque of FSCW PMSM is produced by both the principle of conventional PMSM and the magnetic gearing effect. A finite element analysis (FEA)-based equivalent current sheet model and harmonic restoration method is firstly used in FSCWdoi:10.1109/tie.2017.2758747 fatcat:2537m22r2bg7jmxd4gaxa2pdpi