Patent ID: 7051420

Claim:
A method for manufacturing an armature of an electric motor to reduce brush arching, the method comprising: forming an armature having a plurality of circumferentially arranged slots for winding thereon a plurality of coils; segmenting a first coil into first and second subcoil portions in series with one another; winding said first subcoil portion of said first coil around a first pair of spaced apart ones of said slots with a first plurality of winding turns; winding said second subcoil portion of said first coil around a second pair of spaced apart slots, which are circumferentially shifted from said first pair of slots, with a second plurality of winding turns; segmenting a second coil into first and second subcoil portions in series with one another; winding said first subcoil portion of said second coil around said second pair of spaced apart ones of said slots a number of turns in accordance with a third plurality of winding turns; winding said second subcoil portion of said second coil around a third pair of spaced apart slots shifted circumferentially from said second pair of spaced apart ones of said slots, with a fourth plurality of winding turns; segmenting a third coil into first and second subcoil portions in series with one another; and winding said first subcoil portion of said third coil in the same slots of said lamination stack as said first subcoil portion of said second coil, and winding said second subcoil portion of said third coil in the same slots as said second subcoil of said second coil.