POWER-DRIVEN TOOL Russian patent published in 2015 - IPC H02K23/66 H02K3/28 H02K7/14 

FIELD: electricity.

SUBSTANCE: invention relates to a power-driven tool equipped with a three-phase brushless electric motor, and more precisely to a control method of an output characteristic of the electric motor of the power-driven tool. The power-driven tool includes a brushless motor that includes a rotor with a constant magnet, a cylindrical stator and three-phase stator windings. Multiple slots are made on the inner surface of the stator at specified intervals in a circumferential direction. Each of the three stator windings is formed with multiple coils wound in the slots of the stator and connected to each other. Total number of coil turns wound in the slots of each phase is the same for three phases and is not divisible by the number of slots of each phase.

EFFECT: creation of an easy control method of an output characteristic of a brushless motor in a power-driven tool by control of the number of turns of the coil included in a stator winding.

6 cl, 27 dwg