Patent ID: 7274126

Claim:
A power tool comprising: a housing; an electric motor supported within said housing; said electric motor including having an armature with a plurality of circumferentially arranged winding slots; a commutator on said armature with twice as many commutator bars as armature slots; a stator having a plurality of field coils defining a commutation zone therebetween; said armature including: a first coil having a magnetic axis and being coupled to a first pair of said commutator bars wound around a first pair of spaced apart ones of said slots such that said first coil at least substantially completes commutation within said commutation zone; a second coil split into first and second serially connected subcoils and coupled to a second pair of said commutator bars, with the first subcoil wound in the first pair of slots and the second subcoil wound in a second pair of said slots offset from said first pair of slots, said subcoils having a resultant magnetic axis, said second coil at least substantially completing commutation within said commutation zone; and a third coil having a magnetic axis and being coupled to a third pair of said commutator bars, said third coil being wound into said second pair of slots, said third coil operating to at least substantially complete commutation within said commutation zone; and said magnetic axis of each said coil being approximately aligned between the pair of said commutator bars to which said coil is coupled.