KR200401042Y1 - Permanent Magnetic Actuator Improved Linear Motion Function - Google Patents

Abstract

The present invention minimizes the frictional loss caused by the linear motion of the mover and makes the linear motion stable, so that the permanent magnet type with the improved linear motion function maximizes the efficiency of the manipulator and improves product quality and reliability. It relates to a manipulator.

In the present invention, the fixed iron core 10 constituting the body of the manipulator, and the passage 11 formed in the middle of the fixed iron core 10 is installed to enable reciprocating movement in the axial direction, and has a drive shaft 21 at both ends A permanent magnet 30 disposed at an approximately longitudinal midpoint of the passage 11 of the fixed iron core 10 and the permanent magnet 30 interposed therebetween, Including the first coil 40 and the second coil 50, by selectively applying a current to the first coil 40 or the second coil 50, the first coil 40 or the second coil 50 In the permanent magnet manipulator which is capable of reciprocating the movable part 20 in the axial direction by the force of the magnetic field excited by the magnetic field and the force of the magnetic field of the permanent magnet 30, A guide block 100 fitted to an intermediate point of each of the upper and lower ends; It is installed at the intermediate point of the guide block 100, the drive shaft 21 of the mover 20 is inserted therein so as to be slidable in the axial direction to pass through, and to the linear motion of the drive shaft 21 Including a friction reducing guide member 200 for reducing friction and smoothly guiding the operation, the guiding action for the axial linear movement of the mover 20 of the manipulator is driven by the drive shaft 21 of the mover 20. There is provided a permanent magnet manipulator with an improved linear motion function, which is implemented by guiding the axial linear motion of the blade by the friction reducing guide member 200.

Description

Permanent Magnetic Actuator Improved Linear Motion Function

The present invention relates to a permanent magnet actuator (PMA), and more particularly, to minimize frictional losses due to linear motion of the mover and to ensure stable linear motion, thereby maximizing the efficiency of the actuator and It relates to a permanent magnet actuator with an improved linear motion function to improve the reliability.

Permanent Magnetic Actuator (PMA) is a manipulator that allows the mover to move linearly by the magnetic field of the permanent magnet and the force of the magnetic field excited by the coil. This is mainly a machine such as a circuit breaker. It is used as an actuator to operate the element.

The structure of the permanent magnet actuator is well known in the art through the Republic of Korea Patent No. 10-0492753.

The structure of the permanent magnet actuator is described in more detail with reference to FIGS. 1A and 1B and FIGS. 2A and 2B.

As shown in FIGS. 1A to 2B, the permanent magnet actuator 2 includes a fixed iron core 10 that forms a body of the actuator by stacking magnetic plates of a magnetic material, and a passage formed in the middle of the fixed iron core 10 ( 11) approximately the longitudinal direction of the movable body 20 of the magnetic body and the passage 11 of the fixed iron core 10 which can be reciprocated in the up and down direction (hereinafter referred to as the 'axial direction') in the drawing. It includes a permanent magnet 30 installed at the intermediate point. Here, the drive shaft 21 is installed in the mover 20, which drives the linear movement of the mover 20, and at the same time, a connection for connecting to a mechanical element such as the circuit breaker described above. It acts as an element.

In addition, the first coil 40 and the second coil 50 are installed on the opposite side in the axial direction with the permanent magnet 30 interposed therebetween. The first coil 40 and the second coil 50 are wound in a direction orthogonal to the direction of movement of the mover 20, the winding directions of which are made in opposite directions to each other.

As shown in FIG. 1A, when a current is applied to the first coil 40, the mover 20 is driven by the force of the magnetic field excited by the first coil 40 and the magnetic field of the permanent magnet 30. ) Moves in the first direction (upward in the figure). The mover 20 is moved in the first direction and then cuts off the current supplied to the first coil 40. Then, as shown in FIG. 1B, the mover 20 is fixed (holding) at the position moved in the first direction by the force of the magnetic field of the permanent magnet 3.

 In the above state, when a current equal to or greater than a magnitude sufficient to overcome the holding force by the magnetic field of the permanent magnet 30 is applied to the second coil 50, the mover 20 may hold the holding force by the magnetic field of the permanent magnet 30. Is moved in the second direction to obtain a state as shown in FIG. 2A of the accompanying drawings. In this state, when the current supplied to the second coil 50 is cut off, as shown in FIG. 2B, the mover 20 is moved in the second direction by the force of the magnetic field by the permanent magnet 30. Locked in position.

Such a permanent magnet actuator 2 is applied to a circuit breaker, especially a vacuum circuit breaker, and has shown excellent performance. When the permanent magnet actuator 2 is applied to a breaker, when the first direction is referred to as a 'trip direction' in which an accident current is sensed and the breaker is operated in a direction of interrupting transmission and distribution current, The two directions may be referred to as the 'injection direction' which allows the breaker to perform normal transmission and distribution.

The manipulator applied to such a breaker must be completed within a certain breaking time (usually within 50 ms), and the repulsive force acts as a large force, so that it must be able to operate at a very large force and a high speed correspondingly.

By the way, the conventional manipulator 2 has insufficient consideration of the frictional force due to the linear movement of the movable member 20 and the stable movement of the movable member, and the loss of the operating force is large. Did not exert enough.

For example, in the conventional manipulator 2, the structure for guiding the mover 20 has a guide block 60 in the middle of the fixed iron core 10 as shown in the accompanying drawings, FIGS. 3A and 3B. A guide hole 61 is formed in the guide block 60, and the drive shaft 21 of the movable element 20 is passed through the guide hole 61.

According to such a structure, the drive shaft 21 and the guide hole 61 are brought into surface contact, and the friction force is inevitably increased, and the efficiency of the manipulator 2 is inevitably deteriorated due to the loss due to friction. That is, the loss due to friction is the loss of the force for moving the mover 20. If the manipulator is applied to the breaker without forgetting such a problem, the operation of the mover is slowed down, so that the tripping operation and the closing operation of the breaker cannot be normally performed.

Concerning the loss of the force to move the mover 20 as described above, conventionally by supplying a larger current to the coil 40, 50 increases the force to move the mover 20 to compensate for the loss caused by friction I was going to. However, in order to supply a larger current to the coils 40 and 50, a control board corresponding to a high driving voltage and a high driving current must be made, which requires a large manufacturing cost of the control board. In other words, a capacitor having a large capacity should be used because the driving voltage is high, and a control element of high rating should be used because the driving current is large.

In addition, as described above, according to the structure of simply passing the drive shaft 21 of the mover 20 to the guide hole 61 of the guide block 60, between the guide hole 61 and the mover 20 Clearance control is not easy. That is, if the gap is too large, the mover 20 is inclined or shakes in operation, and if the gap is too small, the friction loss is increased. In this case, the stable movement of the mover 20 is disturbed, thereby degrading the quality and reliability of the manipulator.

The present invention has been made in view of the conventional circumstances as described above, which maximizes the efficiency of the manipulator by minimizing the frictional loss caused by the linear movement of the mover, and improves the quality and reliability by making the linear movement of the mover stable. The purpose is to provide a manipulator that can be made.

The object of the present invention described above is a fixed iron core constituting the body of the manipulator, a mover installed in the passage formed in the middle of the fixed iron core axially movable and having a drive shaft at both ends, the passage of the fixed iron core A permanent magnet installed at an intermediate point in a longitudinal direction of the first coil, and a first coil and a second coil mounted at both sides of the axial direction with the permanent magnet interposed therebetween, to selectively select current in the first coil or the second coil. In the permanent magnet manipulator which is capable of reciprocating the mover in the axial direction by the force of the magnetic field excited in the first coil or the second coil and the force of the magnetic field of the permanent magnet as applied, the image of the fixed iron core A guide block fitted into an intermediate point of each of the lower ends; It is installed at an intermediate point of the guide block, the drive shaft of the mover is inserted in the axial direction so that the sliding can be inserted therein, and the friction reduction guide for smoothly guiding operation and reducing the friction caused by the linear movement of the drive shaft The linear motion function including the member is achieved by providing an improved permanent magnet manipulator.

According to the permanent magnet actuator of the present invention, the guiding action with respect to the axial linear movement of the mover of the manipulator is realized by guiding the axial linear movement of the drive shaft of the mover by the friction reducing guide member, and It is possible to maximize the efficiency of the manipulator by minimizing the frictional resistance during the linear movement of the ruler, and to make the operation of the manipulator stable, thereby providing a manipulator with excellent quality as a whole.

In the permanent magnet actuator having improved linear motion function according to the present invention, the friction reducing guide member is a non-lubricated bush or bearing having a low coefficient of friction compared to the guide block and self-lubrication, so that no additional oil supply is required. Can be configured.

Alternatively, the friction reducing guide member has a cylindrical body and a surface treatment layer having a low coefficient of friction and high abrasion resistance on the inner surface of the cylindrical body, wherein the surface treatment layer contacts the drive shaft and the straight line of the drive shaft. Can be configured to guide the workout.

Alternatively, the friction reducing guide member may be configured to have a plurality of balls provided therein, such that the plurality of balls contact the drive shaft to guide linear movement of the drive shaft.

In the permanent magnet actuator of which the linear motion function of the present invention is improved, the friction reducing guide member may be press-inserted into the insertion hole of the guide block.

Otherwise, the friction reducing guide member may be coupled to the insertion hole of the guide block by a key.

Hereinafter, with reference to the accompanying example drawings will be described in detail a preferred embodiment of the present invention.

4A and 4B show an example of a permanent magnet actuator having improved linear motion characteristics according to the present invention. FIG. 4A is an overall cross-sectional view, and FIG. 4B is an enlarged cross-sectional view showing a linear motion guide portion. Is shown. The same reference numerals are given to the same parts as in the prior art.

As shown in FIGS. 4A and 4B, the manipulator 2 has a fixed iron core 10 constituting a body, and a mover 20 is formed inside the passage 11 formed in the middle of the fixed iron core 10. It is installed to reciprocate in the axial direction. Drive shafts 21 are provided at both ends of the movable element 20.

In addition, a permanent magnet 30 is provided at an approximately longitudinal middle point of the passage 11 of the fixed iron core 10, and the first coil 40 is disposed at both sides in the axial direction with the permanent magnet 30 interposed therebetween. ) And a second coil 50 are provided.

Therefore, the force of the magnetic field excited by the first coil 40 or the second coil 50 and the permanent magnet 30 by selectively applying a current to the first coil 40 or the second coil 50. The mover 20 is reciprocated in the axial direction by the force of the magnetic field.

In the present invention, as shown in Figure 4a, in order to guide the axial linear movement of the mover 20, the guide block 100 in the middle of each of the upper and lower ends of the fixed iron core 10 This is fitted. In the center of the guide block 100 is provided a friction reducing guide member 200 for reducing the friction caused by the linear motion of the drive shaft 21 and to guide the operation smoothly. Inside the friction reducing guide member 200, the drive shaft 21 of the mover 20 is inserted to allow sliding in the axial direction. According to such a structure, the axial direction of the mover 20 of the said manipulator is guided by guiding the axial linear motion of the drive shaft 21 of the mover 20 by the friction reducing guide member 200. Guiding action for linear motion is performed.

Here, the friction reducing guide member 200, for example, the friction coefficient is significantly lower than the guide block 100, and has a self-lubricating, oil-free type (oilless: oilless) that does not require a separate oil supply ) Bush or bearing can be used.

Also, for example, in the art, a linear bush, dry bush, ball bush, dry bearing, linear bearing, linear sliding bearing, linear motion bearing, ball type linear motion Bushes or bearings called bearings, LM bearings and the like can be used.

The friction reducing guide member 200 shown in FIGS. 4A and 4B shows, as an example, a guide member called oil-free dry bush or dry bearing in the above examples. As shown in FIG. 4B, the cylindrical body 210 has a cylindrical body 210 in which a metal plate is rolled or joined to form an annular shape, and the inner surface of the cylindrical body 210 has a small coefficient of friction and abrasion resistance. The surface treatment layer 211 which is excellent in this and does not need lubrication is formed. In the present invention, the cylindrical body 210 itself may be a self-lubricating product, that is, an oilless product, so that the drive shaft 21 directly slides on the cylindrical body 210. Alternatively, as shown in the embodiment shown in Figure 4b, the cylindrical body 200 is composed of a common metal material (for example, cold-rolled steel sheet, stainless steel, etc.) that is plated with chromium, etc., the outside of the cylindrical body 210 The surface treatment layer 211 may be formed on the inner surface. Here, the surface treatment layer 211 is, for example, porous sintered bronze powder or the like on the inner surface of the cylindrical body 210, the mixture of PTFE (polytetrafluoroethylene) and lead (Pb) in the porous By coating the self-lubricating property can be implemented in a form that does not require lubrication. The surface treatment layer 211 of this type is a completely oilless bush or bearing having a low coefficient of friction, which is resistant to high loads and impact loads, has excellent wear resistance, has a long service life, and does not require oiling. It is mainly used for the part which wants to prevent the contamination by pollution, especially in order to prevent noise and smooth operation. In addition, the friction reducing guide member 200 illustrated in FIG. 4B uses a flange portion 212 formed at one end (outer end on the drawing) of the cylindrical body 210. Alternatively, the straight shape may be used without the flange portion 212 described above.

Here, in assembling the guide block 100 of the friction reducing guide member 200, the friction reducing guide member 200 is press-fitted into the insertion hole 101 of the guide block 100. You can. The press-in of the friction reducing guide member 200 is produced by applying an interference fit tolerance to the insertion hole 101 of the friction reducing guide member 200 and the guide block 100, for example. Forced insertion in pneumatic presses can be used. Otherwise, a key and key way combination may be used.

5A to 5C show another example of the guide member 200 for reducing friction described above.

In the example shown in FIG. 5A, as the friction reducing guide member 200, a ball-type linear motion bearing or a ball bush having a plurality of balls therein is used. Therefore, the driving shaft 21 is in contact with the balls to minimize the friction force.

5B and 5C are enlarged views showing the relationship between the friction reducing guide member 200 and the drive shaft 21. As shown in FIGS. 5B and 5C, the friction reducing guide member 200 includes a plurality of balls 221 rotatably supported by the retainer 222 in the cylindrical body 220, and both ends thereof. The seal 223 is provided with a seal. On the other hand, the flange 224 is formed in one end (outer end on drawing) of the cylindrical body 220. However, the flange 224 is not necessary.

According to the present invention as described above, the drive shaft 21 of the mover 20 is point-contacted with the plurality of balls 221 at various points to guide the movement in the axial direction. However, such a ball-shaped friction reducing guide member 200 does not necessarily have to be the shape shown in the drawings. That is, the guide member 200 for reducing friction in the form of a ball shown in the drawings only shows one example suitable for application to the manipulator of the present invention, among the various types of ball-type linear motion bearings or ball bushes described above.

Here, in assembling the ball-shaped friction reducing guide member 200 to the guide block 100, the cylindrical body 220 can be pressed into the insertion hole 101 of the guide block 100. have. The press-fit of the cylindrical body 220 is, for example, manufactured by applying an interference fit tolerance to the insertion hole 101 of the cylindrical body 220 and the guide block 100, and then forcedly inserted in the hydraulic or pneumatic press. Can be.

6A and 6B show another method of assembling the linear motion bearing 200 and the guide block 100 described above. Here, only the friction reducing guide member 200 illustrated in FIGS. 5A to 5C is illustrated, but the same may be applied to the friction reducing guide member illustrated in FIGS. 4A and 4B.

6A and 6B, the cylindrical body 220 of the friction reducing guide member 200 is shown coupled to the guide block 100 by a key 210. The key 210 is axially inserted into the outer circumference of the cylindrical body 220 and is inserted into the key groove 102 of the guide block 100.

In this case, the rotation of the cylindrical body 220 can be completely prevented by the locking action by the key 210 and the key groove 102.

In addition, while using the key 210 and the key groove 102 described above, the cylindrical body 220 may be co-fitted (forced press-fit) to the guide block 100. For example, forcing the cylindrical body 220 itself to the guide block 100, forcing the key 210 to the keyway 102, or otherwise the cylindrical body 220 and the key 210 You can also force them all together.

In the above, specific embodiments of the present invention shown in the accompanying drawings have been described in detail, but this is only one preferred embodiment, and the protection scope of the present invention is not limited thereto. In addition, the embodiments of the present invention as described above is capable of various modifications and equivalent other embodiments by those of ordinary skill in the art within the technical spirit of the present invention, such modifications and other embodiments are equivalent to this embodiment Naturally, it belongs to the attached utility model registration claim of the invention.

As described above, in the manipulator according to the present invention, since the guide for the axial linear movement of the mover is implemented in the form of guiding the drive shaft of the mover by a guide member for reducing friction, Friction loss is minimized, thereby maximizing the efficiency of the manipulator.

In addition, the low drive voltage and drive current can satisfy the requirements of the manipulator, thereby reducing the size of the product, reducing the price of the control board, and stably moving the linear motion of the manipulator. And reliability is improved.

In addition, when the manipulator of the present invention as described above is applied to the breaker, it is possible to provide an excellent breaker in which the trip operation and the closing operation are very quick and stable.

Figures 1a and 1b schematically show a conventional permanent magnet actuator, Figure 1a is a view showing a cross section when the mover is in the trip position, Figure 1b is a view showing the distribution of the magnetic force line at this time.

Figures 2a and 2b schematically show a conventional permanent magnet manipulator, Figure 2a is a view showing a cross section when the mover is in the input position, Figure 1b is a diagram showing the distribution of the magnetic force line at this time.

3A and 3B schematically show a linear motion guide structure of a mover of a conventional permanent magnet actuator, where FIG. 3A is a perspective view and FIG. 3B is a sectional view.

4A and 4B show an example of a permanent magnet actuator having improved linear motion characteristics according to the present invention. FIG. 4A is an overall sectional view, and FIG. 4B is an enlarged sectional view showing a linear motion guide portion.

5A to 5C show another example of the friction reducing guide member of the permanent magnet actuator having improved linear motion characteristics according to the present invention. FIG. 5A is a cross-sectional view of the actuator, and FIG. 5B is an enlarged linear motion guide portion. 5C is a cross-sectional view taken along line AA of FIG. 4A.

6A and 6B show yet another assembling structure of the friction reducing guide member shown in FIGS. 5A to 5C. FIG. 6A is a partially enlarged cross-sectional view, and FIG. 6B is a cross-sectional view taken along a direction perpendicular to FIG. 6A. .

<Explanation of symbols for the main parts of the drawings>

2: manipulator 10: fixed iron core

11: passage 20: mover

21: drive shaft 30: permanent magnet

40: first coil 50: second coil

100: guide block 101: insertion hole

102: key groove 200: guide member for reducing friction

210: cylindrical body 211: surface treatment layer

212: flange 220: cylindrical body

221: Retainer 222: Ball

223 seal 224 flange

230: tall

Claims (6)

Movable iron (10) constituting the body of the manipulator, and the mover (20) installed in the passage (11) formed in the middle of the fixed iron core 10 to enable reciprocating movement in the axial direction and having a drive shaft (21) at both ends ), A permanent magnet 30 provided at an approximately longitudinal middle point of the passage 11 of the fixed iron core 10, and first coils 40 disposed at both sides in the axial direction with the permanent magnet 30 interposed therebetween. ) And the second coil 50, and excited in the first coil 40 or the second coil 50 by selectively applying current to the first coil 40 or the second coil 50. In the permanent magnet actuator that is capable of reciprocating the mover 20 in the axial direction by the force of the magnetic field and the force of the magnetic field of the permanent magnet 30, A guide block 100 fitted to an intermediate point of each of the upper and lower ends of the fixed iron core 10; It is installed at the intermediate point of the guide block 100, the drive shaft 21 of the mover 20 is inserted therein so as to be slidable in the axial direction to pass through, and to the linear motion of the drive shaft 21 Including friction guide member for reducing friction and guide the operation smoothly, The guiding action with respect to the axial linear movement of the mover 20 of the manipulator is realized by guiding the axial linear movement of the drive shaft 21 of the mover 20 by the friction reducing guide member 200. Permanent magnet actuator with improved linear motion function, characterized in that. The method of claim 1, The friction reducing guide member 200 has a lower coefficient of friction than the guide block 100 and has a self-lubricating property, and thus does not require oil supply. Magnetic actuator. The method of claim 1, The friction reducing guide member 200 is formed of a cylindrical body 210 and a surface treatment layer 211 having a low coefficient of friction and high wear resistance on an inner surface of the cylindrical body 210. A permanent magnet actuator with improved linear motion function, characterized in that the layer (211) contacts the drive shaft (21) to guide the linear motion of the drive shaft (21). The method of claim 1, The friction reducing guide member 200 has a shape in which a plurality of balls 221 are provided therein, so that the plurality of balls 221 contact the drive shaft 21 to linearly move the drive shaft 21. Permanent magnet-type manipulator with improved linear motion function, characterized in that to guide the. The method of claim 1, The friction reducing guide member 200 is fitted permanently into the insertion hole 101 of the guide block 100, characterized in that the permanent magnet actuator with improved linear motion function. The method of claim 1, The friction reducing guide member 200 is a permanent magnet actuator improved linear movement function, characterized in that coupled to the insertion hole 101 of the guide block (100) by the key (key).