Power tool

Abstract

A power tool includes: a functional element; an electric motor including a stator and a rotor and configured to drive the functional element to rotate; a power supply module configured to supply power to the electric motor; a driver circuit electrically connected to the electric motor and the power supply module and configured to apply a voltage of the power supply module to the electric motor; and a controller electrically connected to the driver circuit and configured to output a control signal to the driver circuit. The controller is configured to, when the electric motor is overloaded, adjust a current limit value supplied to the electric motor and control the driver circuit in a first control mode, so as to cause a voltage of the electric motor to vary in a quasi-sine wave with a rotor position of the electric motor.

Dependencies are inferred from the claim text.