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Control method of electric tool and electric tool implementing the control method

A technology of electric tools and control methods, applied in the direction of adaptive control, general control system, control/adjustment system, etc., which can solve the problems of high cost, troublesome manufacturing, complex structure of mechanical clutch, etc.

Active Publication Date: 2019-12-13
POSITEC POWER TOOLS (SUZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of the above-mentioned mechanical clutches is relatively complicated, the manufacture is troublesome, and the cost is relatively high.

Method used

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  • Control method of electric tool and electric tool implementing the control method
  • Control method of electric tool and electric tool implementing the control method
  • Control method of electric tool and electric tool implementing the control method

Examples

Experimental program
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Effect test

Embodiment 1

[0060] An embodiment of the present invention provides a control method of an electric tool, such as Figure 20 As shown, the method includes the following steps:

[0061] S1, measuring the parameters used to represent the load of the output shaft that change with time, the parameters include a variety of parameters, such as current, voltage, speed, etc. The measurement method may be sampling at a fixed period.

[0062] S2, obtain the derivative of the parameter with respect to time, which can be a first-order derivative, a second-order derivative or a higher-order derivative. This derivative is actually figure 1 The slope of the middle curve. There are many ways to calculate the derivative, which will be described in detail below.

[0063] S3, generating a corresponding control signal based on the derivative, that is, generating the control signal according to any one of the first-order derivative, second-order derivative or higher-order derivative. These derivatives can ...

Embodiment 2

[0106] As mentioned in the previous implementation, figure 2 yes figure 1 The graph of the first order derivative di / dt of medium current i versus time t. in, figure 1 The first part A and the second part B in the figure are correspondingly shown as straight lines parallel to the horizontal coordinate axis t, while the second part K is shown as a sharply rising curve.

[0107] image 3 yes figure 1 Calculate the second derivative d of medium current i with respect to time t 2 i / dt 2 after the graph. in, figure 1 The values ​​of the first part A and the second part B in have become zero after the second derivative, while the second part K is shown as a parabola with an opening downwards, and is in the top area of ​​the parabola (including the apex of the parabola). A specific interval) forms a peak signal p. With reference Figure 4 As shown, when the peak signal p is formed, a control signal s will be generated accordingly. Of course, in a preferred embodiment, a t...

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Abstract

The invention relates to a control method of an electric tool. The electric tool comprises a motor and an output shaft driven by rotation of the motor. The output shaft is used for outputting a rotation torque to drive a work head to work on a work piece. The control method comprises the steps of measuring a time-varying parameter used to represent the load of the output shaft, getting a derivative of the parameter versus time, generating a corresponding control signal based on the derivative, and interrupting the torque output of the electric tool according to the control signal. According to the invention, a corresponding action is performed after the work piece is detected to reach a predetermined position, and it is guaranteed that the work piece does not pass over the predetermined position.

Description

technical field [0001] The invention relates to a control method of an electric tool. [0002] The present invention also relates to an electric tool implementing the above control method. Background technique [0003] Existing electric tools, such as electric screwdrivers, provide electric current through a loaded power supply to drive the motor to rotate, so that the working head rotates to drill the screw into the wooden board. Different types of screws have different body diameters, or different head shapes, so that they drill into the same board differently. In addition, different wood boards have different hardness due to different materials, so the situation of the same screw drilling into wood boards of different materials is not the same. Usually, during the use of an electric screwdriver, the user needs to drill the screw until the head is close to the surface of the workpiece. In this way, the user needs to pay attention to the drilling process very carefully to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 万德康张传兵
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD
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