KR101741461B1 - Thomson coil actuator - Google Patents

Thomson coil actuator Download PDF

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Publication number
KR101741461B1
KR101741461B1 KR1020150160502A KR20150160502A KR101741461B1 KR 101741461 B1 KR101741461 B1 KR 101741461B1 KR 1020150160502 A KR1020150160502 A KR 1020150160502A KR 20150160502 A KR20150160502 A KR 20150160502A KR 101741461 B1 KR101741461 B1 KR 101741461B1
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KR
South Korea
Prior art keywords
thomson coil
mover
thomson
coil
power
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Application number
KR1020150160502A
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Korean (ko)
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KR20170056974A (en
Inventor
우동균
Original Assignee
영남대학교 산학협력단
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Priority to KR1020150160502A priority Critical patent/KR101741461B1/en
Publication of KR20170056974A publication Critical patent/KR20170056974A/en
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Publication of KR101741461B1 publication Critical patent/KR101741461B1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/18—Movable parts of magnetic circuits, e.g. armature
    • H01H50/20—Movable parts of magnetic circuits, e.g. armature movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2481—Electromagnetic mechanisms characterised by the coil design
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/42—Induction-motor, induced-current, or electrodynamic release mechanisms

Abstract

Thomson coil actuators are provided. A Thomson coil actuator according to an embodiment of the present invention includes: a first Thomson coil; A second Thomson coil spaced a predetermined distance from the first Thomson coil; As the power is applied to the first Thomson coil or the second Thomson coil, the first Thomson coil or the second Thomson coil is lowered toward the second Thomson coil side or raised toward the first Thomson coil side by an electromagnetic repulsive force with the first Thomson coil or the second Thomson coil. Mover; And a power unit for sequentially applying the power to the first and second Thomson coils and the second Thomson coil before completion of the upward or downward movement of the mover to reduce the amount of impact of the mover when the mover moves up or down.

Description

Thomson Coil Actuator {THOMSON COIL ACTUATOR}

Embodiments of the invention relate to Thomson coil actuators.

Generally, when an overcurrent and a short circuit occur in a power system, a fault current of several tens of times the rated current instantaneously flows, and the circuit breaker (or switch) quickly blocks or minimizes such a fault current Thereby minimizing equipment damage at the lower end. Actuators are required to drive the breakers or switches, and there are various types of actuators depending on the driving method. Among these, the Thomson Coil Actuator is an actuator that is driven by the electromagnetic repulsive force between the coil and the mover, and has a faster operating characteristic than a general actuator. That is, for a typical actuator, the operating time is 20 to 30 ms, while the Thomson coil actuator completes operation within a few milliseconds.

However, due to this fast operation characteristic, the mover of the Thomson coil actuator moves fast, and when the operation of the Thomson coil actuator is completed, there is a risk that the mover will be greatly impacted by the contact portion of the circuit breaker and damage the Thomson coil actuator.

Korean Registered Patent No. 10-1410780 (July 17, 2014)

Embodiments of the present invention are directed to providing a Thomson coil actuator having electromagnetic brake characteristics.

According to an exemplary embodiment of the present invention, a first Thomson coil; A second Thomson coil spaced a predetermined distance from the first Thomson coil; As the power is applied to the first Thomson coil or the second Thomson coil, the first Thomson coil or the second Thomson coil is lowered toward the second Thomson coil side or raised toward the first Thomson coil side by an electromagnetic repulsive force with the first Thomson coil or the second Thomson coil. Mover; And a power unit for sequentially applying power to the first and second Thomson coils and the second Thomson coil before completion of the rising or lowering of the mover to reduce the amount of the impact that the mover receives when the mover moves up or down, Thomson coil actuators are provided.

The power unit may apply power to the second Thomson coil before the lowering of the mover is completed after the power source is applied to the first Thomson coil.

The power unit may apply power to the first Thomson coil before the rising of the mover is completed after the power source is applied to the second Thomson coil.

Wherein the Thomson coil actuator further comprises a sensor for sensing movement of the mover, wherein the power unit receives a sense signal from the sensor when the mover passes a set point, Power can be applied to the coil or the second Thomson coil.

The power unit may predict a time point at which the mover passes through the set point using the set moving speed of the mover, and apply power to the first or second Thomson coil at the predicted time.

According to the embodiments of the present invention, power is applied to the first Thomson coil or the second Thomson coil before the rising or falling of the mover is completed to generate an electromagnetic repulsive force, thereby reducing the amount of the impact that the mover receives when the mover ascends or descends Which can prevent damage to the Thomson coil actuator.

1 is an exploded view of a Thomson coil actuator according to an embodiment of the present invention;
2 is a diagram illustrating the operation of the Thomson coil actuator in a first open state in accordance with an embodiment of the present invention;
FIG. 3 illustrates operation of the Thomson coil actuator in a second state according to an embodiment of the present invention; FIG.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The following detailed description is provided to provide a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, this is merely an example and the present invention is not limited thereto.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intention or custom of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification. The terms used in the detailed description are intended only to describe embodiments of the invention and should in no way be limiting. Unless specifically stated otherwise, the singular form of a term includes plural forms of meaning. In this description, the expressions "comprising" or "comprising" are intended to indicate certain features, numbers, steps, operations, elements, parts or combinations thereof, Should not be construed to preclude the presence or possibility of other features, numbers, steps, operations, elements, portions or combinations thereof.

1 is an exploded view of a Thomson coil actuator 100 in accordance with an embodiment of the present invention. The Thompson coil actuator 100 according to an embodiment of the present invention is an apparatus used to drive a mechanical device (not shown) such as a breaker (or switch), which mechanically contacts the contact part And the driving of the mechanical device can be controlled by opening and closing by pushing or pulling. 1, a Thomson coil actuator 100 according to an embodiment of the present invention includes a first Thomson coil 102, a second Thomson coil 104, mover 106, 108, 110, The first metal part 112, the third metal part 114, the permanent magnet 116, the elastic body 118, the first support part 120, the second support part 122, the third support part 124, The mover 106, 108, 110 includes a rod 106, an armature 108, and a first metal portion 110. The rod 106,

A first Thomson coil (open coil) 102 is a coil used to open the contact of the machine, for example, in the form of a spiral. The first Thomson coil 102 can generate magnetic flux by receiving power from a power source unit. The magnetic flux generates an eddy current in the armature 108, and an electromagnetic force is generated on the side of the second Thomson coil 104 by the eddy current. Accordingly, the mover 106, 108, 110 can descend toward the second Thomson coil 104, and one end of the rod 106 can pull the contact portion to open the contact portion. In this case, no overcurrent flows to the mechanical device.

The second Thomson coil 104 is a coil used to close the contact portion of the mechanical device, and may be formed, for example, in a spiral shape. The second Thomson coil 104 can receive magnetic flux from the power source to generate magnetic flux. The magnetic flux generates an eddy current in the armature 108, and an electromagnetic force is generated by the eddy current on the first Thomson coil 102 side. Accordingly, the mover 106, 108, 110 can rise toward the first Thomson coil 102, and one end of the rod 106 can push the contact portion to close the contact portion. In this case, a current flows through the mechanical device.

The mover 106, 108, 110 includes a rod 106, an armature 108, and a first metal portion 110 as a portion where movement occurs within the Thomson coil actuator 100.

The rod 106 is a portion to which the armature 108 and the first metal portion 110 are coupled and may extend in a direction perpendicular to the first Thomson coil 102 and the second Thomson coil 104. For example, a spiral protrusion may be formed on a part of the outer circumferential surface of the rod 106, and a helical groove may be formed on the inner circumferential surface of the armature 108 and the first metal part 110 so as to engage with the spiral protrusion. The rod 106 can be engaged with the armature 108 and the first metal part 110 and can move up or down in association with the armature 108 and the first metal part 110. [

One end of the rod 106 may be connected to the contact portion of the mechanical device and the contact may be opened or closed as power is applied to the first Thomson coil 102 or the second Thomson coil 104 have. As described above, when power is applied to the first Thomson coil 102, the electromotive force 108 is applied to the second Thomson coil 104 by the electromagnetic repulsive force between the first Thomson coil 102 and the armature 108, And the rod 106 can also be lowered to the second Thomson coil 104 side in cooperation with the armature 108. As shown in FIG. In this case, one end of the rod 106 can pull the contact portion to open the contact portion. When the power is applied to the second Thomson coil 104, the electromotive force 108 rises toward the first Thomson coil 102 due to the electromagnetic repulsive force between the second Thomson coil 104 and the armature 108 And the rod 106 may also be raised to the first Thomson coil 102 side in conjunction with the armature 108. [ In this case, one end of the rod 106 may push the contact portion to close the contact portion.

For example, the rod 106 may be made of a fiber reinforced plastic (FRP) material having low specific gravity and high strength, but the material of the rod 106 is not limited thereto.

The armature 108 is a portion that moves upward or downward by electromagnetic interaction with the first Thomson coil 102 and the second Thomson coil 104, and may be, for example, a circular plate. A hole may be formed in the central portion of the armature 108, and a helical groove for coupling with the rod 106 may be formed on the inner circumferential surface of the hole.

The armature 108 generates an eddy current by the magnetic flux generated when power is applied to the first Thomson coil 102 and generates a magnetic field generated by the eddy current and the magnetic flux generated by the first Thomson coil 102 An electromagnetic force can be generated toward the second Thomson coil 104 side by an electromagnetic repulsive force. The armature 108 can be lowered toward the second Thomson coil 104 and the rod 106 and the first metal part 110 are also lowered toward the second Thomson coil 104 in cooperation with the armature 108 can do. In this case, one end of the rod 106 can pull the contact portion to open the contact portion.

The armature 108 generates an eddy current by a magnetic flux generated when power is applied to the second Thomson coil 104 and generates a magnetic flux generated by the eddy current and a magnetic flux generated by the second Thomson coil 104 An electromagnetic force can be generated at the first Thomson coil 102 side by the electromagnetic repulsive force with the first Thomson coil 102. [ The armature 108 can be raised toward the first Thomson coil 102 and the rod 106 and the first metal part 110 are also raised toward the first Thomson coil 102 in cooperation with the armature 108. [ can do. In this case, one end of the rod 106 may push the contact portion to close the contact portion.

For example, the armature 108 may be made of copper with high conductivity to improve eddy current characteristics, but the material of the armature 108 is not limited thereto. For example, the armature 108 may be made of aluminum, aluminum alloy, or the like.

The first metal part 110 is a part that is raised or lowered in conjunction with the rod 106 and the armature 108 in accordance with the upward or downward movement of the armature 108 and may be formed in a circular plate shape, for example. A hole may be formed in the center of the first metal part 110 and a helical groove may be formed in the inner circumferential surface of the hole for coupling with the rod 106.

The first metal part 110, the second metal part 112, the third metal part 114 and the permanent magnet 116 form a magnetic path when the first metal part 110 is lowered, 108, and 110 can maintain the falling state by the magnetic force generated by the magnetic path. Specifically, when the first metal part 110 is lowered toward the second metal part 112, the gap between the first metal part 110 and the second metal part 112 is reduced, . That is, as the first metal part 110 is lowered toward the second metal part 112, a larger magnetic force is generated, and the magnetic force becomes larger than the elastic force of the elastic body 118. The mover 106, 108, or 110 can complete the downward movement (i.e., move and stop until it can be lowered to the maximum), and can maintain the lowered state by the magnetic force.

The second metal part 112, the third metal part 114, and the permanent magnet 116 are parts forming the first metal part 110 and the magnetic path. The first metal part 110, the second metal part 112 and the third metal part 114 may be made of steel having excellent magnetic properties in order to reduce the weight thereof in consideration of magnetic saturation, The material of the first metal part 110, the second metal part 112 and the third metal part 114 is not limited thereto.

The permanent magnet 116 is a magnet that generates and maintains a stable magnetic field without being supplied with electric energy from the outside, and may be made of a material having a large residual magnetic force and a large coercive force.

The elastic body 118 is a portion for elastically supporting the first metal part 110, and may be, for example, a spring. The elastic members 118 can elastically support the first metal part 110 toward the first Thomson coil 102. When the first metal part 110 rises, the mover 106, 108, So that the raised state can be maintained by the elastic force provided by the elastic member. Specifically, when the first metal part 110 rises toward the first Thomson coil 102, the gap between the first metal part 110 and the second metal part 112 becomes large, . That is, as the first metal part 110 moves toward the first Thomson coil 102, the magnetic force decreases and the magnetic force becomes smaller than the elastic force of the elastic body 118. The mover 106, 108, or 110 can complete the upward movement (i.e., move and stop until it can rise to the maximum), and can maintain the elevated state by the elastic force.

The first support portion 120 supports the first Thomson coil 102 and the first Thomson coil 102 can be fixed to the first support portion 120.

The second support portion 122 may be a portion supporting the second Thomson coil 104 and the second Thomson coil 104 may be fixed to the second support portion 122.

The third supporting part 124 is connected to the first supporting part 120 and the second supporting part 122 and the first supporting part 120 and the second supporting part 122 can be fixed to the third supporting part 124 have. The first, second, and third supports 120, 122, and 124 may be made of a non-magnetic material having a low electrical conductivity or a fiber reinforced plastic (FRP) material.

A power source (not shown) applies power to the first Thomson coil 102 and the second Thomson coil 104. The power supply unit may include a first power supply unit for supplying power to the first Thomson coil 102 and a second power supply unit for supplying power to the second Thomson coil 104.

An electromagnetic repulsive force is generated between the first Thomson coil 102 and the armature 108 when the power is applied to the first Thomson coil 102 from the first power source unit so that the armature 108 is in contact with the second Thomson coil 102 104).

An electromagnetic repulsive force is generated between the second Thomson coil 104 and the armature 108 when power is applied to the second Thomson coil 104 from the second power source unit so that the armature 108 contacts the first Thomson coil 104. [ It can rise toward the coil 102 side.

As described above, the Thomson coil actuator 100 has quick operation characteristics as compared with a general actuator. That is, in the case of a general actuator, the operation time is 20 to 30 ms, while the Thomson coil actuator 100 can complete the operation within several ms. Here, the completion of the operation means that an open state or a close state in which the mover 106, 108, 110 is moved upward or downward, that is, the mover 106, 108, State. However, due to this fast operating characteristic, the mover 106, 108, 110 of the Thomson coil actuator 100 moves rapidly, and when the Thomson coil actuator 100 completes its operation, one end of the rod 106 contacts the mechanical contact There is a risk that the Thomson coil actuator 100 may be damaged. Accordingly, in the embodiments of the present invention, in order to reduce the amount of impact of the mover 106, 108, 110 when the mover 106, 108, 110 is completed, The first Thompson coil 102 and the second Thomson coil 104 are sequentially energized. This will be described in detail with reference to FIG. 2 and FIG.

FIG. 2 is a diagram illustrating operation of the Thomson coil actuator 100 in a first open state according to an embodiment of the present invention. As shown in FIG. 2, the power supply unit 126 may include a first power supply unit 126-1 and a second power supply unit 126-2.

First, the first power source unit 126-1 may apply power to the first Thomson coil 102 (i.e., S1 is closed). In this case, the first Thomson coil 102 can generate a magnetic flux, and the magnetic flux generates an eddy current in the armature 108, and an electromagnetic force is generated by the eddy current to the second Thomson coil 104 side. Accordingly, the mover 106, 108, 110 can be lowered toward the second Thomson coil 104 side.

Next, before the descent of the mover 106, 108, or 110 is completed, the second power source 126-2 may apply power (i.e., close S2) to the second Thomson coil 104. [ In this case, the second Thomson coil 104 can generate a magnetic flux, which generates an eddy current in the armature 108, and an electromagnetic force is generated by the eddy current on the first Thomson coil 102 side. That is, an electromagnetic force in the opposite direction to the electromagnetic force generated by the application of power to the first Thomson coil 102 is generated, and accordingly, the moving speeds of the mover 106, 108, and 110 falling to the second Thomson coil 104 Can be reduced. Through this process, the movement of the mover 106, 108, 110 is interrupted electromagnetically, and the amount of the impact received by the mover 106, 108, 110 upon completion of the descent of the mover 106, 108, 110 can be significantly reduced .

FIG. 3 is a diagram illustrating operation of the Thomson coil actuator 100 in a second state according to an embodiment of the present invention.

First, the second power source 126-2 may apply power (i.e., close S2) to the second Thomson coil 104. [ In this case, the second Thomson coil 104 can generate a magnetic flux, which generates an eddy current in the armature 108, and an electromagnetic force is generated by the eddy current on the first Thomson coil 102 side. Accordingly, the mover 106, 108, 110 can rise toward the first Thomson coil 102 side.

Next, before the mover 106, 108, or 110 is completely raised, the first power source unit 126-1 may apply power to the first Thomson coil 102 (i.e., S1 is closed). In this case, the first Thomson coil 102 can generate a magnetic flux, and the magnetic flux generates an eddy current in the armature 108, and an electromagnetic force is generated by the eddy current to the second Thomson coil 104 side. That is, an electromagnetic force in the opposite direction to the electromagnetic force generated by the application of power to the second Thomson coil 104 is generated. Accordingly, the moving speeds of the mover 106, 108, and 110 rising toward the first Thomson coil 102 Can be reduced. Through this process, the movement of the mover 106, 108, 110 is interrupted electromagnetically, and the amount of the impact received by the mover 106, 108, 110 upon completion of the mover 106, 108, 110 can be significantly reduced .

That is, according to the embodiments of the present invention, power is applied to the first Thomson coil 102 or the second Thomson coil 104 before the rising or falling of the mover 106, 108, 110 is completed to generate an electromagnetic repulsive force 108, and 110 can be reduced when the mover 106, 108, or 110 completes the rising or falling of the mover 106, 108, and 110, thereby preventing damage to the Thomson coil actuator 100. [

Further, the Thomson coil actuator 100 may further include a sensor (not shown) for sensing the movement of the mover 106, 108, 110. The sensor may be, for example, a motion sensor, an acceleration sensor, a gyro sensor, or the like, and may be attached to one side of the mover 106, 108, or 110.

The power supply unit 126 receives a detection signal from the sensor when the mover 106, 108, or 110 is set and transmits the detection signal to the first Thomson coil 102 or the second Thomson coil 104 Power can be applied.

As an example, when the mover 106, 108, 110 is lowered toward the second Thomson coil 104 as power is applied to the first Thomson coil 102, the second power source 126-2 supplies the mover 106 108, 110) can receive a detection signal from the sensor when the slider (106, 108, 110) passes through a set point (for example, 2 mm from the drop completion point) Power can be applied to the second Thomson coil 104 according to the detection signal.

As another example, when the mover 106, 108, 110 rises toward the first Thomson coil 102 as power is applied to the second Thomson coil 104, the first power source 126-1 supplies the mover 106 108, 110) can receive a sense signal from the sensor when passing through a set point (e.g., 2 mm away from the rise completion point) in the ascending movement process of the sensors (108, 110) Power can be applied to the first Thomson coil 102 according to the detection signal.

The power supply unit 126 predicts a time at which the mover 106, 108, 110 passes through the set point by using the moving speed of the set mover 106, 108, 110, The second Thomson coil 102 or the second Thomson coil 104 may be powered.

As an example, when the mover 106, 108, 110 is lowered toward the second Thomson coil 104 as power is applied to the first Thomson coil 102, the second power source 126-2 supplies the set mover 108 and 110 in a descending movement process of the mover 106, 108, 110 by using a moving speed (for example, 20 mm / ms) of the mover 106, 108, A point 2 mm away from the descent completion point), and apply power to the second Thomson coil 104 at the predicted point in time.

As another example, when the mover 106, 108, 110 rises toward the first Thomson coil 102 as power is applied to the second Thomson coil 104, the first power source 126-1 supplies the set mover 108 and 110 are set at a set point (for example, in the upward movement of the mover 106, 108, or 110) using the moving speed (for example, 20 mm / The point of time at which the first Thomson coil 102 passes through the point of time when the first Thomson coil 102 is at a point 2 mm away from the rise completion point).

As described above, the power supply 126 supplies the opposite coil (that is, the coil that is not energized) before (or immediately before) the operation of the Thomson coil actuator 100 from the movement or movement speed of the mover 106, 108, The electromagnetic brake characteristic can be realized.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, I will understand. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by equivalents to the appended claims, as well as the appended claims.

100: Thomson coil actuator
102: First Thomson coil
104: second Thompson coil
106: Load
108: Armature
110: first metal part
112: second metal part
114: third metal part
116: permanent magnet
118: elastomer
120: first support part
122: second support portion
124: third support
126:

Claims (5)

First Thomson coil;
A second Thomson coil spaced a predetermined distance from the first Thomson coil;
As the power is applied to the first Thomson coil or the second Thomson coil, the first Thomson coil or the second Thomson coil is lowered toward the second Thomson coil side or raised toward the first Thomson coil side by an electromagnetic repulsive force with the first Thomson coil or the second Thomson coil. Mover; And
And a power unit for sequentially applying the power to the first and second Thomson coils and the second Thompson coil before completion of the upward or downward movement of the mover to reduce the amount of impact of the mover when the mover ascends or descends,
Wherein the power source unit predicts a time point at which the mover passes through the set point using the set moving speed of the mover and applies power to the first Thomson coil or the second Thomson coil at the predicted time point, Actuator.
The method according to claim 1,
Wherein the power source applies power to the second Thomson coil before the lowering of the mover is completed after the power source is applied to the first Thomson coil.
The method according to claim 1,
Wherein the power source applies power to the first Thomson coil before the rising of the mover is completed after applying the power to the second Thomson coil.
The method according to claim 2 or 3,
Further comprising a sensor for sensing movement of the mover,
Wherein the power supply unit receives a sensing signal from the sensor when the mover passes a set point and applies power to the first Thomson coil or the second Thomson coil in accordance with the sensing signal.
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KR1020150160502A 2015-11-16 2015-11-16 Thomson coil actuator KR101741461B1 (en)

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KR101741461B1 true KR101741461B1 (en) 2017-05-30

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101280288B1 (en) * 2012-03-05 2013-07-01 엘에스산전 주식회사 Circuit breaker

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101280288B1 (en) * 2012-03-05 2013-07-01 엘에스산전 주식회사 Circuit breaker

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