The SRG is a doubly salient construction, with salient poles on both the stator and the rotor (Mese et al., 2000). Phase windings are wound on the stator poles, each coil being wound around a single pole or tooth. The principle of operation is simple in concept, (Cardenas et al., 1995), but is easier to explain in the motoring mode. If the winding on poles D-D' be energised, the rotor will be pulled clockwise to align with the axis of the magnetic field produced. If now the winding on D-D' is de-energised, and the winding on poles A-A' be energised instead, the rotor will continue to move in the same direction. The machine is now acting as a motor, converting supplied electric energy into mechanical work. Movement in the direction of the torque produced tends to minimise the inductance of the winding (Mese et al., 2000). Generator action may be obtained simply by changing the angular position of the rotor at which current is supplied to the phase winding, to cause generating torque to be produced.
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