Patent ID: 9438141
Filing Date: 2016-09-06
CPC Classification: B25F,H02P

Claim Text:
1. A braking apparatus for an electric power tool that causes a three-phase brushless motor provided in the electric power tool and having three terminals to generate a braking force, the braking apparatus comprising: a switching circuit comprising six switching elements, the six switching elements comprising: a brake control unit configured such that during rotation of the three-phase brushless motor, upon receiving an input of one of a stop command and a deceleration command of the electric power tool, the brake control unit controls an on/off state of the three switching elements of the high-side switch group and an on/off state of the three switching elements of the low-side switch group to cause a braking current to flow to the three-phase brushless motor, thereby generating the braking force, and wherein the brake control unit is further configured to switch any one selected switching element of the three switching elements forming one selected switch group of the high-side switch group and the low-side switch group to the off state from the on state at a timing at which the braking current flows through the diode connected in parallel to the selected switching element upon turn-off of the selected switching element.