Patent ID: 7449810
Filing Date: 2008-11-11
Classification: B23D,H02K

Abstract:
1. An electric tool comprising: a housing; a stator accommodated in and fixed to the housing for generating a magnetic field flux, the stator having a hollow portion; a rotor shaft rotatably disposed in the hollow portion and defining an axial direction; a rotor core coaxially fixed to the rotor shaft in the hollow portion and having a plurality of rotor core slots extending in the axial direction; end segments disposed on each end of the rotor core, each segments comprising a cylindrical shaft insulator in which the rotor shaft is inserted, and a plate extending radially outward from the shaft insulator with respect to the rotor core, the plate being formed with a plurality of slot parts substantially identical in shape to the rotor core slots at positions opposing the rotor core slots; and rotor coils wound on the rotor core slots and the slot parts of the end segments; wherein the plate in at least one end segment is provided in a position separated from an axial end of the rotor core; and the shaft insulator of the at least one end segment has a rotor core side part and a non-rotor core side part with respect to the plate, the rotor core side part of the shaft insulator has an outer diameter that is smaller than the diameter at the slot part of the plate adjacent to the rotor shaft.