Patent ID: 7870658

Claim:
A method for sheathing an armature for electrical machines in which a lamination packet is attached to an armature shaft, said armature shaft having an outer circumference, said lamination packet having a first face end and a second face end, slots for armature windings, a bore, and a plurality of slotlike gates which extend along either the bore or the outer circumference of the armature shaft from said first face end to said second face end, the method comprising the steps of: injecting insulating plastic on only said first face end of the lamination packet, flowing the plastic from said first face end into the slots and the plurality of gates such that the plastic flows toward the second face end, wherein the plastic originating at the first face end flows faster through the gates than through the slots, allowing the flowing plastic to emerge from the plurality of gates on the second face end, and causing the plastic flowing from the plurality of gates on the second face end to enter the slots from said second face end and flow together with the plastic flowing from said first face end, said method resulting in said lamination packet being provided with at least one slot insulation.