Electric tool and control method thereof

The invention discloses an electric tool and a control method thereof. The electric tool comprises a motor; the output part is driven by the motor to execute the function of the electric tool; the power supply device is used for supplying power to the electric tool; the driving circuit is electrically connected with the motor; the controller is configured to control the motor to operate so as to drive the output part to work and obtain motor parameters of the motor in real time; and estimating the flux linkage of the motor based on the obtained motor parameters, and estimating parameters related to the real-time temperature of the motor according to the flux linkage, thereby controlling the operation of the electric tool according to the obtained parameters. The flux linkage of the motor is estimated through the motor parameters, the parameters related to the motor temperature are estimated according to the flux linkage, the motor temperature can be accurately obtained without arranging a temperature sensor,