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Gap contraction factor for the slot Kgs =
=Ā averageĀ fluxĀ densityĀ overĀ theĀ poleĀ pitchmaximunmĀ fluxĀ densityĀ inĀ theĀ airgap
=Ā ReluctanceĀ ofĀ airgapĀ withĀ slottedĀ armatureĀ ReluctanceĀ ofĀ airgapĀ withĀ smoothĀ armature
=Ā ReluctanceĀ ofĀ airgapĀ withĀ ductsĀ ReluctanceĀ ofĀ airgapĀ withoutĀ ductsr
=Ā concentradedĀ windingĀ distributedĀ winding