Electric tool and control method thereof

The invention discloses an electric tool and a control method thereof. The electric tool comprises a motor with a rotor and a plurality of stator windings; the braking element is used for outputting a braking instruction for braking the motor; the battery pack is used for providing a power supply for the driving motor; the inverter circuit is provided with a plurality of semiconductor switch elements so as to switch the power-on state of the stator winding; the current detection unit is used for detecting the phase current of a stator winding in the motor; the controller is at least connected with the braking element, the current detection unit and the inverter circuit; the controller is configured to obtain the phase current of the stator winding and estimate the rotor position of the motor according to the phase current; a braking instruction output by a braking element is obtained, the conduction state of a switching element in the inverter circuit is controlled according to the braking instruction and the