Patent ID: 9225216
Filing Date: 2015-12-29
Classification: H02K,Y10T

Abstract:
1. An electric motor for an electric tool, the motor comprising: a rotor having a permanent-magnet excitation; a stator having a plurality of field windings which are wound at least partially from a winding wire; a contact grid for making contact with said field windings, said contact grid comprising a support structure holding a plurality of tabs; a plurality of conductor tracks provided on said contact grid, said conductor tracks being insulated from one another, said conductor tracks molded together with said support structure as one piece; a plurality of contacts provided on said conductor tracks to which said winding wire is fixed; a motor controller coupled with said field windings via said contact grid for powering said field windings for generating a rotating electric field; wherein said winding wire is severed between selected ones of said contacts for electrically connecting said field windings in a manner suitable for generating said rotating electric field when being powered by said motor controller; wherein selected first ones of said tabs extend axially from the support structure and cooperate with mating apertures in said motor controller so as to align said motor controller with respect to said contact grid and to mount said motor controller on the support structure of said contact grid, wherein the selected first ones of said tabs are formed of an electrically insulative material such that said motor controller is mounted on the support structure of said contact grid in an electrically insulative fashion, and wherein selected second ones of said tabs extend radially outward from the support structure and cooperate with mating features provided in or on an inner surface of said stator so as to align said contact grid with respect to said stator when at least a portion of said contact grid is inserted into said stator.