An electrical machine 10 is provided. The electrical machine 10 includes a rotor 24 comprising an inner rotor 28 having a plurality of inner rotor poles 36 and an outer rotor 26 having a plurality of outer rotor poles. The electrical machine 10 further comprises a stator 58 configured to modulate a magnetic flux and to transmit torque to inner rotor 28 and the outer rotor 26, the stator 58 comprising a stator core 116 6 interposed concentrically between the inner rotor and the outer rotor; a multiple of stator windings disposed in a plurality of stator slots, the stator windings configured to form a multiple of stator poles. The stator 58 further comprises a plurality of stator teeth 118 interposed between the plurality of stator slots 120, wherein an arithmetic sum or difference of twice number of stator teeth and a number of the stator poles equals a number of rotor poles 186.
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