Electric tool and electric tool braking method

Abstract

The embodiment of the invention discloses an electric tool and an electric tool braking method. The electric tool includes: a motor including a stator winding and a rotor; the driving circuit is connected with the motor and used for providing an excitation signal for the motor; the controller is connected with the driving circuit and used for outputting a control signal to the driving circuit, and the controller is configured to output a first control signal to control the driving circuit to output an excitation signal with preset intensity or stop outputting the excitation signal when receiving the shutdown signal, so that the motor runs at a reduced speed; and when the rotating speed of the motor is reduced to a first rotating speed threshold value, outputting a second control signal to control the driving circuit to output an excitation signal for short-circuiting the stator winding so as to brake the motor. The rotating speed of the motor is reduced to a certain rotating speed and then braking control is performed, so that overlarge braking force can be avoided, the rotating speed of the motor is prevented from being reduced too fast, and the risk that functional parts of the electric tool loosen and fall off in the braking process can be avoided.

Description

technical field [0001] The embodiments of the present invention relate to the technology of electric tools, and in particular, to an electric tool and a braking method of the electric tool. Background technique [0002] For angle grinder tools, having a braking function can shorten the time interval for repeated startup work, thereby greatly improving the efficiency of the tool. [0003] However, for angle grinding tools, since the grinding disc is fastened with a flange, when the braking speed is too fast, it is easy to cause the grinding disc to loosen, and there is a safety risk of the grinding disc falling off. At the same time, when the braking speed is too fast, it will also cause a large braking current, posing a challenge to the electronic components. SUMMARY OF THE INVENTION [0004] Embodiments of the present invention provide an electric tool and a braking method for the electric tool, which can improve the safety of use and prolong the life of the electric too...

AI Technical Summary

Problems solved by technology

[0003] However, because the grinding disc of angle grinding tools is fastened by a flange, when the braking speed is too fast, it is easy to cause the grinding disc to loosen, and there is a safety risk of the grinding disc falling off.

At the same time, when the braking speed is too fast, it will also cause a large braking current, which poses a challenge to electronic components

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