KR20150001401U - Optical encoder and method for using the same - Google Patents

Optical encoder and method for using the same Download PDF

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Publication number
KR20150001401U
KR20150001401U KR20130008089U KR20130008089U KR20150001401U KR 20150001401 U KR20150001401 U KR 20150001401U KR 20130008089 U KR20130008089 U KR 20130008089U KR 20130008089 U KR20130008089 U KR 20130008089U KR 20150001401 U KR20150001401 U KR 20150001401U
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KR
South Korea
Prior art keywords
light
encoder
motor
optical
inverter
Prior art date
Application number
KR20130008089U
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Korean (ko)
Inventor
김상준
김성엽
정하택
우종식
Original Assignee
대우조선해양 주식회사
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Application filed by 대우조선해양 주식회사 filed Critical 대우조선해양 주식회사
Priority to KR20130008089U priority Critical patent/KR20150001401U/en
Publication of KR20150001401U publication Critical patent/KR20150001401U/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/268—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light using optical fibres
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/347—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Transform (AREA)

Abstract

The present invention relates to an optical encoder for detecting the position, the number of revolutions and the speed of a high-power motor, and a method for detecting the position, the number of revolutions and the speed of the high-power motor using the same. According to an embodiment of the present invention, there is provided an optical encoder comprising: a light emitting lens for irradiating light; a rotation plate having a first plurality of slot grooves for passing the light therethrough; And a light receiving lens for receiving light passing through the rotating plate and the fixed plate; And an electric device for supplying the light to the light emitting lens and converting an optical signal of the light receiving lens into an electric signal, wherein the mechanical device and the electric device are separated from each other by an optical fiber cable, An encoder is provided.

Figure P2020130008089

Description

Technical Field [0001] The present invention relates to an optical encoder,

The present invention relates to an optical encoder and a method of using the same, and more particularly, to an optical encoder for detecting the position, rotation speed and speed of a high-power motor and a method for detecting the position, .

In drilling rigs, drawworks are used to collect oil or natural gas. Drawwork is a major part of the drilling rig, allowing rotation of the rotary table, elevation of the drill pipe, insertion of the casing, and the like. Drawstrings drums are wound by loosening or loosening the wire rope, which is decelerated to 2 to 8 steps from the motor to transmit the power to the drum. At this time, an encoder is connected to the motor to detect the number of revolutions, the position, and the speed of the motor.

On the other hand, a conventional encoder has been filed in a number of applications such as Korean Patent Laid-Open Publication No. 2012-0138479 (Dec. 26, 2012).

1 is a view showing a state in which an encoder is mounted on a draw work according to the prior art. As shown in FIG. 1, a winch drum of a draw work is connected to a motor, and an encoder for detecting the number of revolutions, a position, and a speed of the motor is connected to the motor. The encoder is connected to the encoder counter and inverter by a twister pair line. The encoder senses the pulse, converts it into an electric signal, and transmits it to the encoder counter and the inverter. The encoder counter measures the speed and position of the motor using the received electric signal, and the inverter measures the speed of the motor. The inverter uses the measured speed to control the speed of the motor.

However, according to the related art, since the inverter motor used in the drawworks of the drill rig uses a large electric power, the intensity of the noise generated at the time of starting is very large. Therefore, due to the noise of the inverter motor, There is a problem that malfunction of the encoder connected to the axis of the inverter motor frequently occurs for the purpose of position detection. In addition, in order to prevent noise, a twisted pair line connecting the encoder and the encoder counter and a twisted pair line connecting the encoder and the inverter must be provided separately from the motor power line connecting the inverter motor and the inverter, and the encoder and encoder counter And the twisted pair line connecting the encoder and the inverter must be separated from the motor power line connecting the inverter motor and the inverter, and there is a problem that a lot of human and material waste such as the use of the grounding and the metal conduit occurs. Further, when the encoder is broken due to an electric shock, the safety of the entire drill ship may be threatened.

An object of the present invention is to provide an optical encoder capable of stably detecting the position of a high-noise motor with high noise, low installation cost, and a method of using the same.

According to an embodiment of the present invention, there is provided an optical encoder comprising: a light emitting lens for irradiating light; a rotating plate having a first plurality of slot grooves for passing the light therethrough; A mechanical unit including a fixed plate on which a plurality of slot grooves are formed, and a light receiving lens for receiving light passing through the rotating plate and the fixed plate; And an electric device for supplying the light to the light emitting lens and converting an optical signal of the light receiving lens into an electric signal, wherein the mechanical device and the electric device are separated from each other by an optical fiber cable, An encoder is provided.

In particular, the electrical device may further include an optical detector for converting the optical signal into the electrical signal.

The electrical device may further include a converter for receiving the electrical signal from the optical detector and converting the electrical signal into a form that can be received by an encoder counter or an inverter.

In addition, the electric device transmits the converted electric signal to the encoder counter, and the encoder counter can detect the position of the motor connected to the optical encoder using the converted electric signal.

The electric device transmits the converted electric signal to the inverter. The inverter detects the speed of the motor connected to the optical encoder using the converted electric signal, and controls the motor Can be controlled.

Further, the light may be infrared rays.

Further, the optical encoder may be mounted on a motor of Draw Works.

According to another embodiment of the present invention, there is provided a method of using an optical encoder, comprising the steps of: irradiating light from a light emitting lens onto a rotating plate having a first plurality of slot grooves through which light is passed; Receiving light from the light receiving lens through the rotating plate and a fixed plate having a second plurality of slot grooves through which the light passes; And converting the optical signal of the light receiving lens into an electrical signal in the optical detecting section, wherein the mechanical unit including the light emitting lens and the water tube lens and the electrical apparatus section including the optical detecting section are spaced apart from each other, A method using an optical encoder is provided.

In particular, the method may further include converting the electric signal into a form that the encoder counter can receive, and transmitting the converted electric signal to the encoder counter.

The method may further include detecting the number of revolutions of the motor connected to the encoder using the converted electrical signal in the encoder counter.

The method may further include detecting the position of the motor using the detected number of revolutions of the motor in the encoder counter.

The method may further include converting the electrical signal into a form that the inverter can receive and transmitting the converted electrical signal to the inverter.

The inverter may further include detecting the speed of the motor connected to the encoder using the converted electric signal.

The inverter may further include a step of controlling the motor using the detected speed of the motor.

According to the embodiment of the present invention, since the mechanical unit and the electric device of the optical encoder are separated from each other and connected by the optical fiber cable, the position of the high-power motor with high noise can be stably detected, .

1 is a view showing a state in which an encoder is mounted on a draw work according to the prior art.
2 is a view showing a state in which an optical encoder is mounted on a draw work according to an embodiment of the present invention.
3 is a view showing an optical encoder according to an embodiment of the present invention.
4 is a flowchart illustrating a method of using an optical encoder according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

First, an optical encoder according to an embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3. FIG. FIG. 2 is a view showing a state where an optical encoder is mounted on a draw work according to an embodiment of the present invention, and FIG. 3 is a diagram showing an optical encoder according to an embodiment of the present invention.

As shown in FIG. 2, the winch drum 210 of the drawworks is connected to the motor 220 and is powered by the motor 220. At this time, the motor 220 may be an induction motor using an inverter. An induction motor using an inverter is capable of speed control, is efficient, has many advantages in terms of energy consumption and facility size, but has drawbacks of generating a lot of noise.

2, an optical encoder according to an embodiment of the present invention includes a mechanical part 230 and an electrical part 240. The mechanical part 230 of the optical encoder is connected to the motor 220, And the mechanical part 230 and the electrical part 240 are spaced apart from each other and connected by an optical fiber cable. The optical fiber cable can prevent the noise from being introduced into the electrical device portion 240 of the optical encoder and prevent the noise of the motor from being transmitted to the electrical device portion 240 of the optical encoder, Can be inserted.

Referring to FIG. 3, the mechanical unit 230 of the optical encoder and the electrical device 240 may be connected by an optical fiber cable and may be 100 to 200 meters apart. At this time, the optical fiber cable may be a 4-core optical fiber cable.

3, the mechanical part 230 of the optical encoder includes a light emitting lens 231, a rotating plate 232, a fixing plate 233, and a light receiving lens 234. [

The light emitting lens 231 receives the light from the electrical device 240 of the optical encoder through the optical fiber cable and irradiates the light to the rotating plate 232. At this time, the light may be infrared rays. The optical encoder may include a plurality of emission lenses 231. [

The rotary plate 232 may be a rotary plate having a center portion fixed to the rotary shaft of the motor 220. The rotation plate 232 is arranged to be rotatable together with the rotation axis of the motor 220. The rotating plate 232 is disposed between the light emitting lens 232 and the light receiving lens 234. In the rotary plate 232, a plurality of slot grooves for passing light therethrough are continuously arranged. The plurality of slot grooves may be disposed at regular intervals, and the plurality of slot grooves may be disposed at different distances from the rotation axis.

The fixing plate 233 may be a rotary plate provided at the center of the rotating shaft of the motor 220. The fixing plate 233 is disposed between the light emitting lens 232 and the light receiving lens 234 and is arranged so as to be fixed without rotating even if the rotation axis of the motor 220 rotates. Similarly to the rotary plate 232, a plurality of slot grooves for passing light therethrough are continuously arranged on the fixed plate 233. The plurality of slot grooves may be disposed at regular intervals, and the plurality of slot grooves may be disposed at different distances from the rotation axis.

When the rotation axis of the motor 220 rotates, the light irradiated by the emission lens 231 passes through the rotation plate 232 and the fixing plate 233 when the rotation axis of the motor 220 rotates, The light-shielding and light-shielding occur repeatedly by the fixing plate 233.

The light receiving lens 234 receives light passing through the rotating plate 232 and the fixed plate 233. The optical encoder may include a plurality of light receiving lenses 234. Light transmission and shading by the rotating plate 232 and the fixed plate 233 are repeatedly performed, so that the light receiving lens 234 repeats receiving light and not receiving light.

The number of times of light reception per unit time of the light receiving lens 234 is determined by the rotation speed of the motor 220, ≪ / RTI > That is, the faster the rotational speed of the motor 220, the greater the number of light-receiving lenses 234 receive light per unit time.

The light receiving lens 234 transmits the received optical signal to the optical detecting section 242 of the electrical apparatus section 240 through the optical fiber cable.

3, the electrical device part 240 of the optical encoder includes a light emitting part 241, a light detecting part 242, a converter 243, an encoder counter connector 244, an inverter connector 245, And a power supply unit 246.

The light transmitting portion 241 transmits light to the light emitting lens 231 via an optical fiber cable. The photodetector 242 converts the optical signal received through the optical fiber cable from the light receiving lens 234 into an electric signal and transmits the electric signal to the converter 243. The converter converts the electrical signal into a form that can be received by the encoder counter 250 or the inverter 260.

An encoder counter 250 is connected to the encoder counter connector 244 and an inverter 260 is connected to the inverter connector 245.

The electric signal converted into a form that can be received by the encoder counter 250 is transmitted to the encoder counter 250 and the electric signal converted into a form receivable by the inverter 260 is transmitted to the inverter 260.

The power supply section 246 supplies power to the light emitting section 241, the light detecting section 242, and the converter 243.

The encoder counter 250 detects the number of revolutions per unit time of the motor 220 using the electric signal received from the electrical device 240 of the optical encoder and calculates the position of the motor 220 using the number of revolutions per unit time .

The inverter 260 is connected to the motor 220 to control the operation of the motor 220. The inverter 260 is a device that can control the speed of the motor by varying the current. The inverter 260 detects the speed of the motor 220 using the electrical signal received from the electrical device 240 of the optical encoder and controls the speed of the motor 220 according to the detected speed. For example, if the speed of the detected motor 220 is slower than the desired speed, more current is allowed to flow so that the speed of the motor 220 is faster.

Next, a method of detecting the number of revolutions, the position, and the speed of the motor using the optical encoder according to the embodiment of the present invention will be described with reference to FIG. 4 is a flowchart illustrating a method of using an optical encoder according to an embodiment of the present invention.

Referring to FIG. 4, light is irradiated from the luminous lens 231 toward the rotating plate 232 (S410). Light emitted from the light emitting lens 231 is repeatedly emitted and shielded by the rotary plate 232 and the fixed plate 233 and light received by the light receiving lens 234 through the rotary plate and the fixed plate is received (S420). The optical signal received by the light receiving lens 234 is transmitted to the optical detecting unit 242 via the optical fiber cable, and the optical detecting unit 242 converts the optical signal into an electrical signal.

The converter counter 243 converts the electric signal into a form that can be received by the encoder counter 250 in operation S440 and transmits the converted signal to the encoder counter 250. The encoder counter 250 converts the electric signal into an electric signal, And detects the position of the motor using the number of revolutions (S450).

The converter 260 converts the electric signal to a form that can be received by the inverter 260 in the converter 243 and transmits the electric signal to the inverter 260. The inverter 260 converts the speed of the motor 220 And controls the motor 220 using the detected speed.

The description above is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in this specification are intended to illustrate rather than limit the technical idea of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas which are within the scope of the same should be interpreted as being included in the scope of the present invention.

210: winch drum of drawworks
220: motor
230:
240: electric device part
250: Encoder counter
260: Inverter
231: Luminescent lens
232: Spindle
233: Fixing plate
234: Receiver lens
241: Light emitting portion
242:
243: Converter
244: Connector for encoder counter
245: Connector for inverter
246:

Claims (14)

As an optical encoder,
A light emitting lens for emitting light, a rotating plate having a first plurality of slot grooves for passing the light, a fixing plate having a second plurality of slot grooves for passing the light therethrough, A mechanical device part including a light receiving lens for receiving light; And
And an electric device for supplying the light to the light emitting lens and converting the optical signal of the light receiving lens into an electric signal,
Wherein the mechanical unit and the electrical unit are spaced apart from each other and connected with an optical fiber cable. The method according to claim 1,
Wherein the electrical device section further comprises a photodetection section for converting the optical signal into the electrical signal. The method of claim 2,
Wherein the electrical device portion further comprises a converter for receiving the electrical signal from the optical detection portion and converting the electrical signal into a form receivable by an encoder counter or an inverter. The method of claim 3,
Wherein the electrical device transmits the converted electrical signal to the encoder counter, and the encoder counter detects the position of the motor connected to the optical encoder using the converted electrical signal. The method of claim 3,
The electric device transmits the converted electric signal to the inverter, and the inverter detects the speed of the motor connected to the optical encoder using the converted electric signal, and controls the motor in accordance with the detected speed of the motor Optical encoder. The method according to claim 1,
Wherein the light is an infrared ray. The method according to claim 1,
Wherein the optical encoder is mounted on a motor of a DrawWorks. A method of using an optical encoder,
Irradiating light from a light emitting lens to a rotating plate on which a first plurality of slot grooves for passing the light are formed;
Receiving light from the light receiving lens through the rotating plate and a fixed plate having a second plurality of slot grooves through which the light passes; And
And converting the optical signal of the light receiving lens into an electrical signal in the optical detecting unit,
Wherein the mechanical unit including the light emission lens and the water tube lens and the electric device including the optical detection unit are spaced apart from each other and connected with an optical fiber cable. The method of claim 8,
Further comprising converting the electrical signal into a form receivable by an encoder counter and transmitting the electrical signal to an encoder counter. The method of claim 9,
And detecting the number of revolutions of the motor connected to the encoder using the converted electrical signal in the encoder counter. The method of claim 10,
And detecting the position of the motor using the detected number of revolutions of the motor in the encoder counter. The method of claim 8,
Further comprising the step of converting the electrical signal into a form receivable by the inverter and transmitting it to the inverter. The method of claim 12,
And detecting the speed of the motor connected to the encoder using the converted electrical signal in the inverter. 14. The method of claim 13,
And controlling the motor using the speed of the detected motor in the inverter.
KR20130008089U 2013-10-01 2013-10-01 Optical encoder and method for using the same KR20150001401U (en)

Priority Applications (1)

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KR20130008089U KR20150001401U (en) 2013-10-01 2013-10-01 Optical encoder and method for using the same

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Application Number Priority Date Filing Date Title
KR20130008089U KR20150001401U (en) 2013-10-01 2013-10-01 Optical encoder and method for using the same

Publications (1)

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