KR20160084897A - Electronic actuator with cooling device - Google Patents

Abstract

Provided is an electronic actuator comprising: a box-shaped housing; an LM guide installed in an inner lateral surface of the housing in a longitudinal direction; a driving adopter connected to a linear shaft protruding outwards from the housing, having a lateral part attached to the LM guide inside the housing to be able to slide; plate-shaped magnets fixated and attached to a top surface and an underside of the driving adopter, and driven with the driving adopter at the same time; upper and lower coil units fixated to both inner lateral surfaces of the housing by being separated in an outer side of a vertical direction of both magnets; and a fan cooling unit installed in a top surface of the box-shaped housing, cooling heat generated inside the actuator. The linear shaft extended from the driving adopter is linearly driven when a current is applied to the coils. According to this, the electronic actuator with the cooling device is capable of preventing damage caused by a vibration of compartment when the actuator is driven; obtaining a high freedom of design with the simple structure; lowering a unit cost; selectively and easily increasing a capacity of the actuator; lowering a failure rate using the cooling device with high cooling efficiency; and improving durability.

Description

[0001] ELECTRONIC ACTUATOR WITH COOLING DEVICE [0002]

More particularly, the present invention relates to an electronic actuator having a low failure rate and high durability by providing a cooling device having a simple structure, minimizing vibration, easily increasing capacity as required, and having a high cooling efficiency .

Generally, an electromagnetic actuator converts electromagnetic energy into kinetic energy using electromagnetic force. Such electronic actuators are representative examples of voice coils and solenoid valves of speakers.

The electromagnetic actuator moves the bobbin 20 by the interaction between the magnetic force generated in the magnet 22 and the electromagnetic force generated in the coil 21 of the bobbin 20 as shown in FIG. That is, the electromagnetic actuator converts electric energy applied to the coil 21 into kinetic energy necessary for movement of the bobbin 20.

The illustrated conventional electronic actuator is disclosed in Korean Patent Publication No. 1994-7409 (voice coil solenoid valve) disclosed in the Korean Intellectual Property Office. This conventional technique opens and closes the flow path 24 while the bobbin 20 moves by the kinetic energy as described above. At this time, the bobbin 20 opens the flow path 24 through the valve member 23 at the bottom. When the coil 21 is not energized, the bobbin 20 is forcibly lowered by the coil spring 25 so as to shield the flow path 24.

However, since the lower end of the bobbin 20 is fixed to the coil spring 25, the electromagnetic actuator according to the related art has a problem that the response is low and the magnetic circuit is not smoothly formed.

Further, since the magnet 22 is provided on the inner and outer sides of the bobbin 20 as shown in the drawing, there is a problem that the magnet 22 can not be manufactured in a compact size. Therefore, it is almost impossible to use in vehicles using increasingly miniaturized parts. In addition, there is also a problem that the tension of the coil spring 25 can not be adjusted as needed.

In the conventional electronic actuator, the coil is a driving part of the actuator, and due to the wiring or the cable connecting the coil and the power source, the actuator moves together with the linear driving of the actuator, There is a possibility that the wiring or the cable may be damaged and the structure is very complicated.

Further, there is a problem in that the structure is complicated, the capacity of the actuator is limited according to the electromagnetic force formed in one coil, and it is not applicable to a device requiring a larger capacity.

In addition, in the case of the conventional actuator, when the actuator is operated for a long time, the inside of the actuator is heated, resulting in frequent operation errors and troubles due to such internal heat, resulting in poor durability. In order to solve this problem, an actuator having a cooling device has been proposed. However, it has a problem in that its cooling efficiency is low and its installation is not easy due to restriction of an internal space of the actuator.

Korean Patent No. 10-1069172 (Registered on September 26, 2011)

An object of the present invention which intends to solve the above-described problems is to provide an actuator capable of preventing damage due to component vibration due to driving of an actuator, a simple structure, a high degree of freedom in design, a low cost, And to provide an electronic actuator capable of enhancing the driving force.

It is another object of the present invention to provide a high-quality electronic actuator with a high operating efficiency while lowering the failure rate and enhancing durability by providing a fan cooling unit for taking in and discharging air at a position showing optimal cooling efficiency.

According to an aspect of the present invention, there is provided a portable terminal comprising: a box-shaped housing; An LM guide provided on the inner side surface of the housing in the longitudinal direction; A drive adapter connected to a linear shaft protruding outside the housing and having a side portion slidingly coupled to the LM guide inside the housing; A plate magnet fixedly attached to upper and lower surfaces of the drive adapter and driven simultaneously with the drive adapter; Upper and lower coil units spaced outwardly in the vertical direction of both magnets and fixed to both inner side surfaces of the housing; And a fan cooling unit installed on an upper surface of the box-shaped housing for cooling the heat generated in the actuator, wherein a linear shaft extending from the drive adapter is linearly driven by applying a current to the coil.

Here, the fan cooling unit may include an inlet fan installed at one side of the longitudinal direction of the upper surface of the box-shaped housing and introducing air therein; The fan cooling unit may include a plurality of inflow holes formed to introduce air into one side of the lengthwise direction of the upper surface of the box-shaped housing. And a discharge fan installed on the other side for discharging the air.

Preferably, a heat sink may be attached to at least one of the upper and lower coil units, and the heat sink may be made of at least one of iron, aluminum, and copper.

It is preferable that a plurality of linear motor units constituted by a magnet fixed to the one adapter and a coil unit fixed inside the housing are disposed side by side and the driving adapter slides in the LM guide, It is preferable that the LM block is installed at both ends of the LM guide.

In addition, it is preferable that at least one clamp is installed on the LM guide to selectively fix or release the movement of the adapter in the LM guide, and the movement of the adapter is detected on the inner side of the bottom of the housing, It is preferable to provide a limit sensor for limiting the approach distance to the rear surface within a predetermined range, and an encoder for measuring a linear movement distance of the adapter is installed in a part of the LM guide.

The present invention can prevent damage to parts due to vibration of parts such as a cable, and can be designed with a simple structure, and the cost can be lowered. In addition to minimizing vibrations and noise caused by the driving of the actuator and providing excellent durability, it is easy to replace and repair each component as required. In addition, the linear motor unit can be selectively arranged The capacity of the actuator can be easily increased.

In addition, a fan cooling unit, which takes in and out of the air, is provided at a position showing optimal cooling efficiency considering the flow of air according to the internal heat generated by the actuator driving by the actuator, thereby lowering the failure rate and improving the durability. Thereby providing a high-quality electronic actuator.

FIG. 1 is a driving mode diagram of a conventional electronic actuator,
2 is a perspective view illustrating an external configuration of an electronic actuator having a fan cooling apparatus according to an embodiment of the present invention,
3 is a diagram showing an external configuration of an electronic actuator having a fan cooling device according to another embodiment of the present invention,
4 is a view showing an internal configuration of an electronic actuator having a cooling device according to an embodiment of the present invention,
5 is a view showing the structure of a linear motor unit which is a core configuration of an electronic actuator having a cooling device according to an embodiment of the present invention,
6 is a side view schematically illustrating a structure of a linear linear motor unit of an electromagnetic actuator having a cooling device according to another embodiment of the present invention,
Fig. 7 is a side schematic view of an electronic actuator having a cooling device equipped with a heat seek, and Fig. 8 is a schematic front view and a rear view thereof, as another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish it, will be described with reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. The embodiments are provided so that those skilled in the art can easily carry out the technical idea of the present invention to those skilled in the art.

In the drawings, embodiments of the present invention are not limited to the specific forms shown and are exaggerated for clarity. Also, the same reference numerals denote the same components throughout the specification.

The expression "and / or" is used herein to mean including at least one of the elements listed before and after. Also, singular forms include plural forms unless the context clearly dictates otherwise. Also, components, steps, operations and elements referred to in the specification as " comprises "or" comprising " refer to the presence or addition of one or more other components, steps, operations, elements, and / or devices.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a perspective view illustrating an external configuration of an electronic actuator having a fan cooling apparatus according to an embodiment of the present invention. FIG. 3 is a perspective view illustrating an external configuration of an electronic actuator having a fan cooling apparatus according to another embodiment of the present invention. And FIG. 4 is a diagram showing an internal configuration of an electronic actuator having a cooling device according to an embodiment of the present invention.

As shown in FIGS. 2 and 4, an electronic actuator having a cooling device according to an embodiment of the present invention includes a box-shaped housing 100; An LM guide 150 installed on the inner side surface of the housing in the longitudinal direction; A drive adapter 200 connected to the linear shaft 250 protruding outside the housing and having a side portion slidingly coupled to the LM guide 150 inside the housing; A plate magnet 300 fixedly mounted on the upper and lower surfaces of the drive adapter 200 and driven simultaneously with the drive adapter 200; Upper and lower coil units (400) spaced outwardly in the vertical direction of both magnets and fixed to both inner side surfaces of the housing; And a fan cooling unit (500) installed on the box-shaped housing upper surface (110) for cooling the heat generated in the actuator, wherein a linear shaft extending from the drive adapter .

As described above, in the embodiment of the present invention, the coil unit 400 is fixed to the housing 100, and the magnet 300 is not linearly driven as in the conventional electronic actuator, The present invention proposes a simple and efficient structure that originally eliminates the problem that the coil unit 400 is connected to a power source or an electronic circuit by a cable to generate vibration in the entire system, A fan cooling unit 500 for taking in and discharging air at a position showing optimal cooling efficiency considering the flow of air according to the internal heat and the internal heat generated by the driving is provided to reduce the failure rate and improve the durability, And provides a high-quality electronic actuator having a very high efficiency.

More specifically, as shown in FIG. 2, two fans are installed on both sides in the longitudinal direction of the housing upper surface 110, and an inlet fan 530 for introducing air into one side is installed And the other side is provided with a discharge fan 550 for discharging the internal air, thereby cooling the flow of air heated by the internal heat to obtain the effect of cooling.

4, an actuator having a cooling device according to an embodiment of the present invention includes a drive adapter connected to a linear shaft at an inner center portion thereof, a plate magnet (not shown) disposed at both upper and lower portions of the drive adapter 200 300 are attached to form a mobile unit. When a current is applied to the coil unit by forming a fixed unit in which the coil unit 400 is fixed by being spaced apart from the upper and lower portions of the moving unit by a predetermined distance, an actuator operation in which the moving unit linearly moves forward and backward .

With such an internal configuration, the most amount of heat is generated at the central portion overlapping with the coil unit 400 to which the current is applied the most, and the forward and backward linear reciprocating movement of the moving unit causes both movements A large amount of heated air is trapped in the empty space for forming the space. Therefore, in the embodiment of the present invention, in order to efficiently circulate the heated air collected in the moving space, an inlet fan 530 for introducing air into both side portions in the longitudinal direction of the upper surface of the housing, a discharge fan 550 for discharging air, And a cooling device for introducing the external cold air to the inside through the inlet fan 530 and forming a cooling circulation structure for discharging the heated air inside the outlet fan 550 to the outside through the inlet fan 530 .

3, the structure of the fan cooling unit includes a plurality of inflow holes 535 formed to flow air to both side portions in the longitudinal direction of the housing upper surface 110, A discharge fan 550 for discharging air is provided to introduce cold air from the outside through the inflow hole 535 and to circulate the cooling air circulated through the discharge fan 550 An installation structure of a cooling device for forming a structure is proposed.

In this embodiment, since the cooling air circulation structure is formed between the single discharge fan 550 and the inflow hole 535, the installation cost and the product cost are reduced, the design freedom due to the installation of the fan is increased, Since more empty space can be secured, the air circulation can be made smooth.

5 is a view showing a structure of a linear motor unit which is a core configuration of an electronic actuator having a cooling device according to an embodiment of the present invention. 5, unlike the linear motor unit 600 in which the conventional magnet 300 is a fixed part and the structure including the coil unit 400 is formed as a moving part, A structure of the linear motor unit 600 in which the coil unit 400 is a fixed part and the magnet 300 is a moving part is proposed.

The actuator structure according to an embodiment of the present invention can prevent component damage due to vibration of a wire connecting part without inducing vibration of a wire or cable connected to the fixed coil unit 400, The driving adapter 200 is positioned at the center of the magnet 300 and the driving adapter 200 is linearly driven by the electromagnetic force due to the magnetic field generated by both the coil units 400, There is an advantage that the degree of design freedom is increased.

In addition, not only the unit cost can be reduced by such a simple structure, vibration and noise caused by driving the actuator are minimized, durability is excellent, and each component can be easily exchanged and repaired as required.

Here, the box-shaped housing 100 is a box-shaped structure in which an installation space is formed inside the case of the electromagnetic actuator, and it is preferable to use a case made of a metal or alloy which is light and durable.

4, a longitudinal direction LM guide 150 is fixedly installed on the inner side surface of the housing 100, and a plate-shaped or quadrangular frame-shaped drive adapter (not shown) is attached to the LM 200 are slidingly coupled. That is, when the driving adapter 200 is slid along the LM guide 150, the driving adapter 200 is driven. A linear shaft 250 extends from the front surface of the driving adapter 200 to expose the housing 100.

The coil unit 400 has a structure in which coils are wound inside a plate-shaped case, and is fixed to both sides of the housing 100 by being spaced apart from the both magnets 300. When a current is applied to the coil, a current flows through the coil, and the coil receives an electromagnetic force due to the Fleming's left-hand rule by a magnetic field formed by the magnet 300 in a direction perpendicular to the direction of the current .

As described above, the electromagnetic force is applied in a direction parallel to the linear actuator. The coil is fixed to the inner surface of the housing 100, and the magnet 300, which applies a magnetic field, is slid to the LM guide 150 The coil unit 400 does not move but the drive adapter 200 to which the magnet 300 is fixed is linearly driven by the electromagnetic force.

2 and 4, the clamp 157 is installed in a part of the LM guide 150. When the power is turned off, the actuator 200 is slid and moved freely while the actuator is moving, The LM guide 150 is a locking device capable of selectively fixing the driving adapter 200 in order to solve the problem of movement of the adapter 200 and impact caused by the movement of the adapter 200.

It is preferable that the LM block 155 is installed at both ends of the LM guide 150 so that the drive adapter 200 slides within the LM guide 150 and moves within a predetermined range. However, when the driving adapter 200 is moved by the electromagnetic force along the LM guide 150, the driving adapter 200 may be rotated in a predetermined range The driving adapter 200 is guided to stably move linearly in a certain linear movement section.

4, the limit sensor 170 detects the movement of the adapter 200 at the rear end of the inner bottom surface of the housing 100 and limits the approach distance to the inner rear surface of the housing 100 to a predetermined range, And a cushioning member 180 of an elastic material is provided on the inner and outer surfaces of the housing 100 to mitigate the impact of impact with the adapter 200. [

The driving adapter 200 is driven while reciprocating linearly at a high speed while the actuator is operated and prevents the driving adapter 200 from colliding with the rear surface of the housing 100 beyond the linear movement interval set by the LM block 155 with an unexpected driving force A limit sensor 170 such as a photosensor is installed on the bottom surface of the rear side of the housing 100 to detect a case where the adapter 200 oversteps the linear movement section and sends a signal to the power source section to shut off the power source, It is possible to prevent damage to the system. In order to more safely prevent damage due to collision, a protruding cushion member 180 made of an elastic material such as rubber may be attached to the inner front surface and the rear surface of the housing 100 to mitigate the impact caused by the collision of the adapter 200 .

It is preferable that an encoder 160 for measuring a linear movement distance of the adapter 200 is installed in a part of the LM guide 150. The actuator 200 is driven precisely and the adapter 200, It is necessary to precisely measure the moving speed of the adapter 200 through the encoder 160 in order to measure the driving force, the frequency, the cycle,

6 is a side view schematically showing a structure of a series linear motor unit of an electronic actuator having a cooling device according to another embodiment of the present invention. 6, the electromagnetic actuator according to the embodiment of the present invention includes a magnet 300 fixed to the adapter 200 inside a box-shaped housing 100, a coil unit 400 fixed inside the housing 100, A plurality of linear motor units 600 are arranged side by side in the adapter 200.

As described above, in the embodiment of the present invention, a plurality of the linear motor units 600 illustrated in FIG. 2 are arranged in series to enlarge the electromagnetic force transmitted to one drive adapter 200 to increase the capacity of the actuator do.

For example, eight 250N linear motor units 600 can be arranged to produce an actuator having a force of 2000N. That is, since it is possible to selectively extend the actuator to an infinite capacity, there is an effect that the limitation of the capacity of the actuator constituted by the conventional single linear motor unit 600 can be eliminated.

As described above, the linear motor used in the conventional transfer robot has a maximum force of only about 2000N. However, the electronic actuator according to the embodiment of the present invention can be used in the durability tester for testing. In terms of equipment, there is a great advantage that the linear motor can be designed with infinite capacity.

Fig. 7 is a side schematic view of an electronic actuator having a cooling device equipped with a heat seek, and Fig. 8 is a schematic front view and a rear view thereof, as another embodiment of the present invention.

7 and 8, there is proposed a structure in which the heat sink 450 is mounted on the side surface of the coil unit 400 provided on the upper and lower portions of the mobile unit (the drive adapter 200 and the plate magnet 300) do. As described above, the mobile unit and the coil unit 400 receiving the current as the fixed unit receive the most heat at the portion where the heat is generated the most, and the mobile unit obtains the cooling effect due to the movement due to the circulation of the internal air However, since the coil unit 450 relatively receives the effect of the air cooling circulation, it is proposed to provide four heat sinks 450 on the side of the coil unit for cooling.

The heat sink 450 has a structure in which a plurality of rod-shaped plates are arranged side by side perpendicular to the plate-like plate. The heat sink 450 absorbs heat generated in the coil unit by using a material having a high thermal conductivity, do. Here, the material of the heat sink 450 is preferably made of at least one of iron, aluminum, and copper having a high thermal conductivity and a very low thermal resistance. It is needless to say that all the materials having high cooling performance are possible, and the arrangement can be freely installed on at least one side of the coil unit side.

While the invention has been shown and described with respect to the specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Anyone with it will know easily.

100: housing, 150: LM guide, 155: LM block, 157: clamp,
160: Encoder, 170: Limit sensor, 180: Buffer member
200: drive adapter, 250: shaft, 300: magnet,
400: coil unit, 500: fan cooling unit, 530: inflow fan, 535: inflow hole,
550: exhaust fan, 600: linear motor unit

Claims (10)

Box type housing;
An LM guide provided on the inner side surface of the housing in the longitudinal direction;
A drive adapter connected to a linear shaft protruding outside the housing and having a side portion slidingly coupled to the LM guide inside the housing;
A plate magnet fixedly attached to upper and lower surfaces of the drive adapter and driven simultaneously with the drive adapter;
Upper and lower coil units spaced outwardly in the vertical direction of both magnets and fixed to both inner side surfaces of the housing; And
And a fan cooling unit installed on an upper surface of the box-shaped housing and cooling the heat generated in the actuator,
And a linear shaft extending from the drive adapter is linearly driven by supplying a current to the coil.
The method according to claim 1,
The fan cooling unit includes:
An inlet fan installed at one side of the longitudinal direction of the upper surface of the box-shaped housing to introduce air; And
And a discharge fan installed on the other side and discharging air.
The method according to claim 1,
The fan cooling unit includes:
A plurality of inflow holes formed to introduce air into one side of the longitudinal direction of the upper surface of the box-shaped housing;
And a discharge fan installed on the other side and discharging air.
The method according to claim 1,
And a heat sink is attached to both sides of at least one of the upper and lower coil units.
5. The method of claim 4,
Wherein the heat sink is made of at least one of iron, aluminum, and copper.
6. The method according to any one of claims 1 to 5,
Wherein a plurality of linear motor units constituted by a magnet fixed to the one adapter and a coil unit fixed to the inside of the housing are arranged side by side.
6. The method according to any one of claims 1 to 5,
Wherein the LM block is installed at both ends of the LM guide so that the drive adapter slides within the LM guide and moves within a predetermined range.
6. The method according to any one of claims 1 to 5,
Wherein at least one clamp is provided on a portion of the LM guide to selectively lock or unlock the movement of the adapter in the LM guide. ≪ RTI ID = 0.0 > 8. < / RTI >
6. The method according to any one of claims 1 to 5,
And a limit sensor for detecting the movement of the adapter and restricting an approach distance from the inner rear surface of the housing to a predetermined range is provided at a rear end of the inner bottom of the housing.
6. The method according to any one of claims 1 to 5,
Wherein an encoder for measuring a linear movement distance of the adapter is installed in a part of the LM guide.

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