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Power tool

A technology of electric tools and voltage, applied in manufacturing tools, single motor speed/torque control, portable motorized devices, etc., can solve problems such as deterioration of working ability and inability to control the number of revolutions, and achieve the effect of precise control

Inactive Publication Date: 2012-02-15
KOKI HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even if the user intends to switch the speed mode, there are troubles that the number of revolutions cannot be controlled and the workability is deteriorated.

Method used

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Experimental program
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Effect test

Embodiment 1

[0039] Now, the embodiments will be described in detail with reference to the accompanying drawings. In this specification, the upper, lower, front and rear directions respectively correspond to such as figure 1 these directions shown. figure 1A power tool according to an embodiment is shown, a portion of which is shown in cross-section. Although the driver drill 1 is used as an example for description in this embodiment, the present invention is not limited to this, and it can also be applied to other electric tools such as impact drivers and hammer drills.

[0040] exist figure 1 , the driver drill 1 includes a motor 2 in a cylindrical housing part 6a, and the driver drill 1 rotates a tip tool (not shown) through a power transmission part 25 for transmitting the driving power of the motor 2, for example, detachable The driver and bit are attached to the chuck 28 mounted on the mandrel (output shaft) 8 . An inverter circuit portion (circuit board 3) for driving the mot...

Embodiment 2

[0069] refer to Figure 9 and Figure 10 , the flow of control processing of the motor in the second embodiment will be described. In the first embodiment, every time the switch trigger 7 is pushed, the target number of revolutions based on the power supply voltage is set. On the other hand, in the second embodiment, the target speed is reset by detecting the battery voltage when the rotation number mode selection switch 42 is switched, without performing frequent changes of the target rotation number. Figure 9 Control status is shown. exist Figure 9 , the Y-axis represents the power supply voltage (voltage of the battery pack 30 ) and the target number of revolutions (rpm) of the motor 2 , and the X-axis represents time (sec). exist Figure 9 In the lower part of , the operation state of the switch flip-flop 7 (the output of the switch operation detection circuit 40 ) and the output signal of the speed mode selection switch 42 are also shown accordingly.

[0070] exis...

Embodiment 3

[0075] Next, refer to Figure 11 to Figure 13 , the third embodiment will be described. Figure 11 The relationship between the target number of revolutions of the motor and the output torque is shown. In the comparative example method for controlling the number of revolutions of the motor with a fixed PWM duty cycle, when the current flowing through the motor increases due to an increase in load such as repulsive force from the tip tool, the number of revolutions of the motor is proportional to the current. decreases inversely proportional, as indicated by the dashed line 111 . On the other hand, in the constant speed control method employing the PID control as represented by the solid line 113, in order to make the motor rotate at the target speed, the deviation between the output and the target value, and the integration and differentiation thereof are used by feedback. of the three items to perform control of the input value. By using PID control in this way, the number o...

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PUM

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Abstract

According to an aspect of the present invention, there is provided a power tool including: a motor; a driving circuit that supplies an electric power from a power supply to the motor; a control part that sets a target rotation number for the motor in accordance with a mode selected from a plurality of modes, each mode having a corresponding target rotation number; and a voltage detecting circuit that detects a voltage of the power supply, wherein the target rotation number is varied based on the detected voltage.

Description

technical field [0001] One aspect of the present invention relates to a power tool motor in which the rotation of the motor is controlled. Background technique [0002] In a screw tightening power tool such as a driver drill, a given number of revolutions is preselected from a plurality of available revolutions of a motor, and screw tightening work is performed by rotating the motor at the selected number of revolutions. For example, JP-H09-065675-A discloses a method for controlling a motor. For example, the number of revolutions can be selected by rotating the mode selection dial, or by pressing a light pressure switch a given number of times. By being able to select a number of revolutions of the motor, a full range of work from low-load to high-load work can be efficiently achieved. When performing screw tightening work or the like, it is important to make the motor follow the user's operation of the trigger, and to make the motor uninterrupted during the work from the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/06B25F5/00
CPCB25F5/00H02P6/06
Inventor 岩田和隆高野信宏谷本英之岛敏洋
Owner KOKI HLDG CO LTD
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