Patent ID: 8872398
Filing Date: 2014-10-28
Classification: H02K

Abstract:
1. An electric power tool with a motor that includes a stator having a plurality of teeth formed circumferentially at equal intervals and axially extending groove-like slots between each tooth, with winding wires being wound around the slots of each tooth, and includes a rotor coaxially surrounding the stator and having a permanent magnet of a plurality of poles on an inner peripheral surface that faces radial distal end surfaces of the teeth of the stator, wherein the number of poles of the permanent magnet of the rotor and the number of slots of the stator are respectively twelve and nine, or sixteen and twelve; the stator is supported by a stator-support fitting member located within a motor case that houses the motor; the stator su ort fitting member includes a disc portion that covers an opening of the motor case and a tubular portion that axially protrudes at the center of the disc portion; and the stator is coaxially connected to a distal end of the tubular portion wherein the stator-support member is fixed to a housing of a speed reduction mechanism that reduces a rotational speed of the motor.