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Slots enable the windings to be installed below the outside circumference of the armature, in order to enable the airgap between the armature and yoke to be minimised -thus minimising the magnetic circuit's reluctance (opposition to the formation of magnetic flux). Some machines, however, use 'salient' (meaning to 'stick out') in which the armature windings are wound around pole pieces -these are for slower machines, such as water turbine driven types.

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