Patent ID: 8810085
Filing Date: 2014-08-19
Classification: B25F,H02K

Abstract:
1. An electric power tool, comprising: a DC brushless motor; a housing that houses the DC brushless motor at a rear of the housing; a battery that is attached to the housing; a motor board that is fixed with regard to the DC brushless motor and that has a board surface upon which at least one sensor is mounted; a first circuit board that supports a plurality of switching elements configured to supply an electric current to the DC brushless motor and that is mounted to the housing, at least one of the switching elements being mounted on a board surface of the first circuit board that is oriented in substantially the same direction as the board surface of the motor board; a second circuit board electrically connected to the first circuit board; and a heat radiation material configured to radiate heat generated by the plurality of switching elements and provided within the housing, wherein the plurality of switching elements comprises a first switching element, a second switching element, and a third switching element, wherein the first switching element is located above the second and third switching elements, and wherein the second switching element is located above the third switching element.