Handheld electric-driven tool and control method thereof

A hand-held power tool and control method technology, applied in the direction of DC motor speed/torque control, excitation or armature current control, control system, etc., can solve the problem of low accuracy and achieve the effect of improving accuracy

Active Publication Date: 2013-10-23
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 torque of a DC motor is not only related to the motor current, and the accuracy of limiting the torque on

Method used

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  • Handheld electric-driven tool and control method thereof
  • Handheld electric-driven tool and control method thereof
  • Handheld electric-driven tool and control method thereof

Examples

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Embodiment approach

[0093] Please refer to Figure 10 , in the second preferred implementation of the manual mode, the second current threshold I2 is used as the reference threshold, and the current threshold is maintained for a period of time, and then the motor speed is maintained to complete the fastening of the workpiece. In this way, the sudden change of the motor current is prevented before the workpiece is fastened, and the motor 20 is effectively protected. Specifically, the second preferred implementation of the manual mode includes the following steps:

[0094] Step S1: Manually setting the first current threshold I1.

[0095] Step S2: manually set or automatically calculate the second current threshold I2, and the second current threshold I2 is lower than the first current threshold I1, and the first current threshold I1 is equal to the sum of the second current threshold I2 and a predetermined constant.

[0096] Step S3: The user presses the trigger of the hand-held electric tool 10...

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PUM

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Abstract

The invention discloses a control method of a handheld electric-driven tool, wherein a first current threshold value and a smaller second current threshold value are set; when the current of a motor achieves the second current threshold value, the rotary speed of the motor is maintained; and when the current of the motor achieves the first current threshold value, the motor is controlled to be stopped, thus improving the precision of torsion adjusting. The invention also provides a handheld electric-driven tool.

Description

technical field [0001] The invention relates to a hand-held electric tool and a control method thereof. Background technique [0002] For handheld power tools, such as electric drills or screwdrivers, it is usually necessary to limit the torque output to prevent damage to the workpiece or burn the motor. [0003] A general electric drill or screwdriver is provided with a mechanical overload clutch between the tool driver and the motor to limit the output torque. However, the mechanical overload clutch has a large volume and low accuracy of torque regulation. [0004] There are also some electric drills or screwdrivers that limit the output torque electronically. Since the torque of a permanent magnet excited DC motor is roughly proportional to the motor current, the corresponding torque can basically be limited by limiting the motor current. Compared with the mechanical overload clutch, this method has smaller volume and higher accuracy. However, the torque of the DC moto...

Claims

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Application Information

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IPC IPC(8): H02P7/00H02P7/28H02P7/29B25F5/00B25B23/147
Inventor 田角峰周昶马虹峰
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD
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