Patent ID: 6175177
Filing Date: 2001-01-16
Classification: H02K

Abstract:
A permanent magnet-excited subassembly of a synchronous motor, comprising:(a) a ferromagnetic body, comprising a stacked plurality of armature plates comprising sheet metal elements reinforced with a ferromagnetic material;(b) a plurality of slots arranged in a front region of each of said sheet metal elements;(c) a plurality of teeth that border said slots and extend toward said front region of said plurality of sheet metal elements;(d) a plurality of internal grooves arranged in and facing a back region of said plurality of sheet metal elements and located directly behind said plurality of slots, wherein the number and position of said internal grooves corresponds to the number and position of said plurality of slots and wherein the internal grooves are reinforced with a nonferromagnetic material;(e) at least one removable narrow bridge arranged between said plurality of slots and said plurality of internal grooves; and(f) a plurality of permanent magnets arranged within said ferromagnetic body and inserted into said plurality of slots.