A method for controlling a brushless electric tool

Abstract

The invention relates to the technical field of motor control, and in particular relates to a novel control method for a brushless electric tool. The control method comprises the following steps: inputting a reverse driving signal to a motor, so that the motor reversely operates according to the reverse driving signal; when the motor reversely operates, constantly monitoring change value of current passing the motor, and converting the current change value into a moment change value through operation; judging whether the moment change value reaches a preset change value, if the moment change value reaches the preset change value, starting to carry out statistics on exit time and rotating speed of the motor, and calculating according to the exit time and rotating speed, so that real-time exit distance is obtained; and judging whether the exit distance reaches a preset distance value, if the exit distance reaches the preset distance value, controlling the motor to brake, so that the motor stops rotating. The novel control method provided by the invention greatly improves the whole working efficiency, has good user experience and is applicable to being popularized on the market.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a control method of a brushless electric tool. Background technique [0002] In the existing brushless electric tools, the brushless motor generally has functions such as forward and reverse, and when the brushless motor is used in some special-purpose electric tools, taking the electric wrench as an example, the brushless motor Forward or reverse rotation, to lock or loosen the nut; and in the process of loosening the nut, if the rotation of the brushless motor is not stopped before the nut falls off the screw rod, the nut will be scattered on the ground, and the staff needs to Finding the nut on the ground will greatly affect the efficiency of production and processing; therefore, in the existing production and processing process, the staff all use their own experience to control the stop and reverse of the brushless motor at an appropriate time by hand, and then The nut...

AI Technical Summary

Problems solved by technology

[0002] In the existing brushless electric tools, the brushless motor generally has functions such as forward and reverse, and when the brushless motor is used in some special-purpose electric tools, taking the electric wrench as an example, the brushless motor Forward or reverse rotation, to lock or loosen the nut; and in the process of loosening the nut, if the rotation of the brushless motor is not stopped before the nut falls off the screw rod, the nut will be scattered on the ground, and the staff needs to Finding the nut on the ground will greatly affect the efficiency of production and processing; therefore, in the existing production and processing process, the staff all use their own experience to control the stop and reverse of the brushless motor at an appropriate time by hand, and then The nuts are screwed out by hand; however, because each worker has different experience, and when the new processing parts are replaced, the workers need to adapt again, so the overall work efficiency is not high, and the user experience is not good. good

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