KR20160111564A - Apparatus and method for controlling motor rpm of electric power tool - Google Patents

Apparatus and method for controlling motor rpm of electric power tool Download PDF

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Publication number
KR20160111564A
KR20160111564A KR1020150035881A KR20150035881A KR20160111564A KR 20160111564 A KR20160111564 A KR 20160111564A KR 1020150035881 A KR1020150035881 A KR 1020150035881A KR 20150035881 A KR20150035881 A KR 20150035881A KR 20160111564 A KR20160111564 A KR 20160111564A
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KR
South Korea
Prior art keywords
motor
switch
rotation speed
rpm
rotational speed
Prior art date
Application number
KR1020150035881A
Other languages
Korean (ko)
Inventor
김준영
Original Assignee
계양전기 주식회사
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Publication date
Application filed by 계양전기 주식회사 filed Critical 계양전기 주식회사
Priority to KR1020150035881A priority Critical patent/KR20160111564A/en
Publication of KR20160111564A publication Critical patent/KR20160111564A/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B3/00—Gang saw mills; Other sawing machines with reciprocating saw blades, specially designed for length sawing of trunks
    • B27B3/28—Components
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/10—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors for preventing overspeed or under speed

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Power Engineering (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

The present invention relates to a device and a method for controlling motor RPM of an electric tool, capable of finely controlling the motor RPM according to a switch manipulation distance of the electric tool. To achieve the same, the device for controlling the motor RPM of the electric tool includes: a switch pressed by a user; an A/D converting unit converting a voltage value applied to a control unit into a digital value according to a switch pressing degree; a reference speed figuring out unit figuring out the RPM of a first motor corresponding to the output value of the A/D converting unit; a storing unit storing the RPM of a second motor corresponding to the each RPM of the first motor; and the control unit reading the RPM of the second motor corresponding to the RPM of the first motor figured by the reference speed figuring out unit and then controlling the RPM of the motor at the read RPM of the second motor. It is desirable that the RPM of the first motor is a value set directly proportional to the output value of the A/D converting unit, and the RPM of the second motor is a value set lower than the RPM of the first motor. Accordingly, the present invention is capable of finely controlling the RPM of the motor according to the switch manipulation distance of the electric tool, thereby enabling a user to use the electric tool at a low speed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electric motor,

The present invention relates to an apparatus and method for controlling a motor rotational speed of an electric power tool, and more particularly, to an apparatus and method for controlling a motor rotational speed of an electric power tool that can finely control a rotational speed of a motor in accordance with a switch operation distance of an electric power tool. will be.

Generally, a power tool is a tool that can be easily and quickly operated by using the power of a motor, an electric drill for drilling a hole, an electric screwdriver for tightening or loosening a screw, an electric grinder or an electric grinder used for finishing or polishing, Saws and electric planes to trim wood, and the like.

Electric power tools having various forms as described above can be directly connected by plugging a cord into an AC power source, or can be used wirelessly using a rechargeable battery.

The power tool is constituted by a driving motor to the inside of the main body, a transmission portion for transmitting rotation torque of the motor, and a chuck for transmitting rotational force from the transmission portion to the tool.

Generally, when the user presses the switch, the tool rotates and performs the work by turning the motor forward. However, as shown in FIG. 1, the rotation speed of the motor is increased in direct proportion to the operating distance of the switch.

In this case, the rotational speed of the motor is increased in direct proportion to the operating distance of the switch. Thus, when the user wants to use the power tool at a low speed, a desired speed may not be obtained.

Korean Registered Patent No. 10-0098403 (registered April 17, 1996).

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a motor rotation speed control device for an electric power tool that allows a user to use the power tool at a low speed by finely controlling the rotation speed of the motor in accordance with the switch operation distance of the power tool. And a method thereof.

According to an aspect of the present invention, there is provided an apparatus for controlling a motor rotational speed of a power tool, including: a switch that is pressed by a user; An A / D converter for converting a voltage value applied to the control unit into a digital value according to a degree of pressing of the switch; A reference speed acquiring unit for acquiring a first motor rotation speed corresponding to an output value of the A / D converter; A storage unit for storing a second motor rotation speed corresponding to each first motor rotation speed; And a control unit for reading the second motor rotational speed corresponding to the first motor rotational speed detected by the reference speed detecting unit from the storage unit and then controlling the rotational speed of the motor at the read second motor rotational speed Wherein the first motor rotation speed is a value directly proportional to an output value of the A / D converter, and the second motor rotation speed is a value lower than the first motor rotation speed.

An apparatus for controlling a motor rotational speed of a power tool according to another embodiment of the present invention includes: a switch that is pressed by a user; An A / D converter for converting a voltage value applied to the control unit into a digital value according to a degree of pressing of the switch; A switch operation distance determining unit for determining a switch operation distance corresponding to an output value of the A / D converter; A storage unit for storing a motor rotation speed corresponding to a switch operation distance; And a control unit for reading the motor rotational speed corresponding to the switch operating distance detected by the switch operating distance detecting unit from the storage unit and then controlling the rotational speed of the motor at the read motor rotational speed.

The method of controlling the motor rotational speed of the power tool according to an embodiment of the present invention is a method of controlling a motor rotational speed of a power tool, when a user presses a switch, the A / D converter converts a voltage value applied from the switch to a control unit, A process of applying to the speed determination unit; Determining a first motor rotation speed corresponding to the digitally converted value by the reference speed determination unit and applying the first motor rotation speed to the control unit; Reading the second motor rotation speed corresponding to the detected first motor rotation speed from the storage unit; And controlling the rotation speed of the motor based on the read second motor rotation speed, wherein the first motor rotation speed is a value set in direct proportion to the output value of the A / D conversion unit , And the second motor rotational speed is a value set lower than the first motor rotational speed.

When the user presses the switch, the A / D converter converts the voltage value applied from the switch to the control unit into a digital value according to the degree of the pressure, A process of applying to the operation distance determination unit; Determining a switch operation distance corresponding to the digitally converted value in the switch operation distance determination unit and applying the switch operation distance to the control unit; The control unit reading the motor rotation speed corresponding to the detected switch operation distance from the storage unit; And controlling the rotation speed of the motor based on the read motor rotation speed.

According to the apparatus and method for controlling the motor rotational speed of the power tool of the present invention, the rotational speed of the motor is finely controlled according to the switch operation distance of the power tool, so that the user can use the power tool at low speed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph illustrating an example of a motor rotational speed of a power tool according to the prior art; FIG.
FIG. 2 is a schematic view illustrating a configuration of a motor rotation speed control apparatus for an electric power tool according to an embodiment of the present invention. Referring to FIG.
FIG. 3 is a schematic view showing a configuration of a motor rotational speed control device of a power tool according to another embodiment of the present invention.
4 is a flowchart illustrating a method of controlling a motor rotational speed of a power tool according to an embodiment of the present invention.
5 is a flowchart illustrating a method of controlling a motor rotational speed of a power tool according to another embodiment of the present invention.
6 is a graph illustrating an example of the rotational speed of a motor of a power tool according to the present invention.

Hereinafter, an apparatus and method for controlling a motor rotational speed of a power tool according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a schematic view illustrating a configuration of a motor rotation speed control apparatus for an electric power tool according to an embodiment of the present invention. Referring to FIG.

In FIG. 2, the switch 10 is operated by the pressure of the user and applies a voltage of, for example, 0 to 3.3 V to the controller 50 according to the degree of pressure.

The A / D conversion unit 20 converts the voltage value applied to the control unit 50 into a digital value according to the degree of pressing of the switch 10.

The reference speed determination unit 30 determines the first motor rotation speed corresponding to the output value of the A / D conversion unit 20. [

The above-described first motor rotational speed is a motor rotational speed set in direct proportion to the output value of the A / D converter 20.

It is preferable that the reference speed acquiring unit 30 stores the first motor rotation speed corresponding to each of the output values of the A / D converter 20.

The storage unit 40 stores the second motor rotation speed corresponding to the first motor rotation speed.

And the second motor rotational speed is set to be lower than the first motor rotational speed.

Table 1 is an exemplary table showing the second motor rotation speeds corresponding to the first motor rotation speeds stored in the storage unit 40, respectively.

The first motor rotational speed 0 219 224 4571 4576 7771 7776 8347 8352 11579 The second motor rotational speed 0 0 713 713 1078 1078 1302 1302 1700 1700 The first motor rotational speed 11584 12635 12640 15067 15072 15707 15712 18619 18624 19355 The second motor rotational speed 1948 1948 2155 2155 2529 2529 2769 2769 3598 3598 The first motor rotational speed 19360 23355 23360 23995 24000 26459 26464 27227 27232 31067 The second motor rotational speed 4808 4808 6599 6599 7105 7105 9592 9592 10901 10901 The first motor rotational speed 31072 31551 32767 The second motor rotational speed 19233 19896 19896

On the other hand, the control unit 50 reads the second motor rotational speed corresponding to the first motor rotational speed detected by the reference speed detecting unit 30 from the storage unit 40, Thereby controlling the rotation speed.

FIG. 3 is a schematic view showing a configuration of a motor rotational speed control device of a power tool according to another embodiment of the present invention.

3, the switch 10 and the A / D converter 20 have the same configuration and operation as those of the switch 10 and the A / D converter 20 of FIG. 2, A detailed description will be omitted.

The switch operation distance determination unit 60 determines the switch operation distance corresponding to the output value of the A / D conversion unit 20.

The above-described switch operation distance determination unit 60 preferably stores the switch operation distances corresponding to the output values of the A / D conversion unit 20, respectively.

The storage unit 40 stores motor rotation speeds corresponding to switch operating distances, respectively.

Table 2 and Table 3 are exemplary tables showing the motor rotation speeds corresponding to the switch operation distances stored in the storage unit 40, respectively.

Switch operating distance (mm) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Motor rotation speed (RPM) 86 86 86 86 86 130 130 130 130 157 Switch operating distance (mm) 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Motor rotation speed (RPM) 205 205 205 205 235 260 260 260 305 334 Switch operating distance (mm) 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Motor rotation speed (RPM) 334 334 334 434 580 580 580 580 796 857 Switch operating distance (mm) 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 Motor rotation speed (RPM) 857 857 1157 1315 1315 1315 1315 2320 2320 2320 Switch operating distance (mm) 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 Motor rotation speed (RPM) 2320 2320 2320 2320 2320 2320 2320 2320 2320 2320

Switch operating distance (mm) 0.0 0.6 1.2 1.6 2.0 2.5 3.0 3.5 4.0 Motor rotation speed (RPM) 85 130 205 260 334 590 857 1315 2400

On the other hand, the control unit 50 reads the motor rotation speed corresponding to the switch operation distance detected by the switch operation distance determination unit 60 from the storage unit 40, and then controls the rotation speed of the motor at the read motor rotation speed .

4 is a flowchart illustrating a method of controlling a motor rotational speed of a power tool according to an embodiment of the present invention.

First, when the user presses the switch 10 to use the power tool, a voltage is applied from the switch 10 to the control unit 50 according to the degree of pressurization (S10).

If a voltage is applied from the switch 10 to the controller 50 through the above-described step S10, the voltage applied to the controller 50 from the A / D converter 20 is converted into a digital signal, (S12).

The reference speed determination unit 30 determines the first motor rotation speed corresponding to the digitally converted value and applies the first motor rotation speed to the control unit 50 in step S14. The second motor rotational speed corresponding to the first motor rotational speed is read from the storage unit (S16), and the rotational speed of the motor is controlled based on the read second motor rotational speed (S18).

5 is a flowchart illustrating a method of controlling a motor rotational speed of a power tool according to another embodiment of the present invention.

First, when the user presses the switch 10 to use the power tool, the voltage is applied from the switch 10 to the controller 50 according to the degree of pressurization (S20).

When the voltage is applied from the switch 10 to the controller 50 through the step S20, the voltage applied to the controller 50 from the A / D converter 20 is converted into a voltage to be applied to the switch operation distance detector 60, (S22).

The switch operation distance determination unit 60 determines the switch operation distance corresponding to the digitally converted value and applies it to the control unit 50 in step S24. The motor rotational speed corresponding to the operating distance is read from the storage unit (S26), and the rotational speed of the motor is controlled based on the read motor rotational speed (S28).

6 is a graph illustrating an example of the rotational speed of a motor of a power tool according to the present invention.

As shown in FIG. 6, when the motor rotation speed of the power tool is controlled according to the present invention, the rotation speed of the motor is finely controlled according to the switch operation distance of the power tool, so that the user can use the power tool at low speed .

The apparatus and method for controlling the motor rotational speed of the electric power tool of the present invention are not limited to the above-described embodiments and can be variously modified within the scope of the technical idea of the present invention.

10. Switch, 20. A / D conversion section,
30. Reference speed determination section, 40. Storage section,
50. Control section, 60. Switch operation distance determination section

Claims (4)

A switch that is pressed by a user;
An A / D converter for converting a voltage value applied to the control unit into a digital value according to a degree of pressing of the switch;
A reference speed acquiring unit for acquiring a first motor rotation speed corresponding to an output value of the A / D converter;
A storage unit for storing a second motor rotation speed corresponding to each first motor rotation speed; And
And a control unit for reading the second motor rotational speed corresponding to the first motor rotational speed detected by the reference speed detecting unit from the storage unit and then controlling the rotational speed of the motor at the read second motor rotational speed In addition,
Wherein the first motor rotational speed is a value set in direct proportion to an output value of the A / D converter, and the second motor rotational speed is a value set to be lower than the first motor rotational speed. Device. A switch that is pressed by a user;
An A / D converter for converting a voltage value applied to the control unit into a digital value according to a degree of pressing of the switch;
A switch operation distance determining unit for determining a switch operation distance corresponding to an output value of the A / D converter;
A storage unit for storing a motor rotation speed corresponding to a switch operation distance; And
And a control section for reading the motor rotation speed corresponding to the switch operation distance detected by the switch operation distance determination section from the storage section and then controlling the rotation speed of the motor at the read motor rotation speed, Speed control device. Converting the voltage value applied from the switch to the control unit according to the degree of pressure of the A / D conversion unit into a digital value and applying the digital value to the reference speed determination unit when the user presses the switch;
Determining a first motor rotation speed corresponding to the digitally converted value by the reference speed determination unit and applying the first motor rotation speed to the control unit;
Reading the second motor rotation speed corresponding to the detected first motor rotation speed from the storage unit; And
And controlling the rotation speed of the motor based on the read second motor rotation speed,
Wherein the first motor rotational speed is a value set in direct proportion to an output value of the A / D converter, and the second motor rotational speed is a value set to be lower than the first motor rotational speed. Way. Converting the voltage value applied from the switch to the control unit according to the degree of pressure of the A / D conversion unit into a digital value and applying the digital value to the switch operation distance determination unit when the user presses the switch;
Determining a switch operation distance corresponding to the digitally converted value in the switch operation distance determination unit and applying the switch operation distance to the control unit;
The control unit reading the motor rotation speed corresponding to the detected switch operation distance from the storage unit; And
And controlling the rotation speed of the motor based on the read motor rotation speed.
KR1020150035881A 2015-03-16 2015-03-16 Apparatus and method for controlling motor rpm of electric power tool KR20160111564A (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110008833A (en) 2009-07-21 2011-01-27 김상운 Oil filterring apparatus and heating system using the same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110008833A (en) 2009-07-21 2011-01-27 김상운 Oil filterring apparatus and heating system using the same

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