JP2005277245A - Solenoid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid whose axial length can be made smaller than in a common solenoid and a necessary thrust can be obtained over a long stroke. <P>SOLUTION: There are provided a first coil 20, a second coil 21 disposed inside the first coil; a movable magnetic pole 11 movably disposed between the first coil 20 and the second coil 21; a first stator 18 disposed on the peripheral side of the movable magnetic pole 11 and on the upper surface side of the second coil 20; a second stator 19 disposed inside the movable magnetic pole 11 and on the upper surface side of the second coil; a first fixed magnetic pole 12, disposed on the peripheral side of the movable magnetic pole 11 and on the lower surface side of the first coil 20 and having a magnetic pole portion 12a directed to the inside, and a second fixed magnetic pole 13 disposed on the inner side of the movable magnetic pole 11 and on the lower surface side of the second coil 21 and having a magnetic pole portion 13a directed to the outside, so that a first magnetic circuit 32 and a second magnetic circuit 33 are constituted by the currents in two coils and the magnetic fluxes thereof join together in the movable magnetic pole 11 and flow to the fixed magnetic poles 12 and 13 to move the movable magnetic pole 11 toward lower surface side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a solenoid, and more particularly to the structure and operating principle of a direct acting solenoid having two coils.

  The basic structure of a direct acting solenoid is a casing that forms a coil that generates magnetic flux, a movable magnetic pole that operates by generating magnetic flux, a fixed magnetic pole that generates an attractive force between the movable magnetic pole, and a magnetic circuit of the solenoid. It consists of a case.

  General solenoids tend to increase the number of coil wire turns of the coil that is the basis of magnetic flux generation to ensure thrust and the stroke that is the operating range of the movable magnetic pole, and take the dimension and shape of the magnetic pole longer in the axial direction It is in. For this reason, the fixed magnetic pole around the coil and the case constituting the magnetic circuit are also elongated in the axial direction.

  However, in recent years, there is a strong demand for downsizing the solenoid. Even in this case, although the dimension in the axial direction is limited, the suction force and the stroke cannot be sacrificed. For this reason, there was a limit to downsizing. (For example, patent document 1).

Patent Document 1 is an application example of a general solenoid, in which a movable magnetic pole that operates and a fixed magnetic pole that attracts the movable magnetic pole extend in the axial direction, a coil is disposed therebetween, and a case is formed so as to cover the coil. Although this solenoid is a small category, it is necessary to secure suction force and stroke as long as it has the purpose of making holes in telephone cards, prepaid cards, etc., and more in the axial direction due to the peripheral devices of the solenoid. Dimensional restrictions are getting stricter.
JP-A-9-260137 (3 pages, FIG. 1)

  The present invention has been made in view of the above-described circumstances, and has been devised so that dimensioning in the axial direction can be minimized as compared with a general solenoid, and necessary thrust and stroke can be obtained. An object is to provide a solenoid.

In order to solve the above problem, the first coil, the second coil located on the inner peripheral side of the first coil, and the first coil and the second coil are movably disposed. A movable stator, a first stator located on an outer peripheral side of the movable magnetic pole and located on an upper surface side of the first coil, an inner peripheral side of the movable magnetic pole, and an upper surface side of the second coil A second stator located on the outer peripheral side of the movable magnetic pole, located on the lower surface side of the first coil, and having a magnetic pole portion directed toward the inner peripheral side, and the movable magnetic pole The second fixed magnetic pole is located on the lower surface side of the second coil and the magnetic pole portion faces the outer peripheral side.

  A first case member positioned on an outer peripheral side of the first coil and fixing the first stator and the first fixed magnetic pole; and positioned on an inner peripheral side of the second coil. The second case member is fixed to the second stator and the second fixed magnetic pole.

  In the solenoid, the first stator, the first case member, the first fixed magnetic pole, the first magnetic circuit including the movable magnetic pole, the second stator, the second stator There are two magnetic circuits, a case member, the second fixed magnetic pole, and a second magnetic circuit composed of the movable magnetic pole, and the movable magnetic pole has a first gap between it and the first fixed magnetic pole. And the movable magnetic pole has a second gap between the movable magnetic pole and the second fixed magnetic pole, and the flow of magnetic flux around the first magnetic circuit and the second magnetic circuit is changed to the movable magnetic pole. By combining them in the same direction, the magnetic flux passing through the first gap and the second gap is directed toward the movable magnetic pole in the axial direction to generate thrust.

  Further, by shifting one of the first fixed magnetic pole and the second fixed magnetic pole of the solenoid in the axial direction of the movable magnetic pole, the first gap and the second gap are moved in the axial direction. It is also possible to exist in different positions.

  In the present invention, magnetic flux is supplied by two coils, and two magnetic circuits are formed for one movable magnetic pole and two fixed magnetic poles. Therefore, thrust is generated between the two magnetic poles of the movable magnetic pole and the fixed magnetic pole. In addition, one of the two fixed magnetic poles can be shifted in the axial direction of the movable magnetic pole to generate a thrust over a long stroke and move the movable magnetic pole. it can.

  Further, in the conventional type, a magnetic flux necessary for obtaining a necessary thrust is generated from one coil. However, according to the present invention, since the coil generating the magnetic flux can be distributed in two places, the configuration of the magnetic circuit can be freely set. Increasing the degree, it becomes possible to respond flexibly according to the purpose of use.

  In the embodiment of the present invention, two coils are arranged on the outer circumference and the inner circumference, a movable magnetic pole is placed between the two coils, and the magnetic pole portions of the two fixed magnetic poles are arranged radially on the outer circumference side and the inner circumference side. Therefore, the magnetic fluxes generated by the two coils are joined and supplied between the movable magnetic poles. Further, it is characterized in that thrust can be generated over a long stroke by arranging one of the magnetic pole portions of the two fixed magnetic poles shifted in the axial direction of the movable magnetic pole. An embodiment having this feature will be described below.

  FIG. 1 is an explanatory view of a solenoid according to a first embodiment of the present invention, and FIG. 2 is an explanatory view of a movable magnetic pole and a solenoid body of the solenoid according to the first embodiment of the present invention. 1 and 2, 10 is a solenoid, 11 is a movable magnetic pole, 11a is a magnetic pole portion of the movable magnetic pole, 11b is an action plate of the movable magnetic pole, 11c is a branching portion of the movable magnetic pole, 12 is a first fixed magnetic pole, and 12a is a first magnetic pole. Magnetic pole part of one fixed magnetic pole, 13 is a second fixed magnetic pole, 13a is a magnetic pole part of the second fixed magnetic pole, 14 and 15 are gaps, 16 is a first case member, 17 is a second case member, and 18 is a first A stator, 19 is a second stator, 20 is a first coil, 21 is a second coil, 22 is a plate, 22a is a hole, 23 is a sleeve, and 24 is a screw. Moreover, the upper side shown in FIG.1 and FIG.2 is made into the upper surface side, and the lower side is made into the lower surface side, and it is the same also in other drawings.

  The solenoid 10 has a movable magnetic pole 11 disposed between the first coil 20 and the second coil 21 in the radial direction. The first stator 18 and the second stator 19 are provided on the upper surface side of each coil, and the first fixed is provided on the lower surface side. A magnetic pole 12 and a second fixed magnetic pole 13 are arranged. The magnetic pole portions 12a and 13a of the two fixed magnetic poles are arranged so as to face the outer peripheral side and the inner peripheral side of the magnetic pole portion 11a of the movable magnetic pole 11 with gaps 14 and 15 therebetween. The first case member 16 fixes the first fixed magnetic pole 12 and the first stator 18, and the second case member 17 also fixes the second fixed magnetic pole 13 and the second stator 19.

In the first embodiment of the present invention, the movable magnetic pole 11, the first fixed magnetic pole 12, the first case member 16, the first magnetic circuit around the first stator 18, the movable magnetic pole 11, the second fixed magnetic pole 13, and the second magnetic circuit. A second magnetic circuit that surrounds the case member 17 and the second stator 19 is configured, and the movable iron core 11 is linearly operated by merging the magnetic flux with the movable magnetic pole 11. is there.
Below, the main structures of the solenoid 10 are demonstrated.

  The movable magnetic pole 11 is formed of a magnetic material, and the upper surface side has a branching portion 11c that branches into a plurality in the circumferential direction, and is fixed to a working plate 11b formed in a disk shape with a screw 24. A first stator 18 is arranged on the outer peripheral side on the upper surface side with an appropriate interval, and a second stator 19 is arranged on the inner peripheral side with an appropriate interval.

  On the lower surface side, there is a magnetic pole part 11 a, which faces the magnetic pole part 12 a of the first fixed magnetic pole 12 with a gap 14 and faces the magnetic pole part 13 a of the second fixed magnetic pole 13 with a gap 15.

  Then, by causing currents in opposite directions to flow through the first coil 20 and the second coil 21, the magnetic flux generated by the two coils passes from the first stator 18 to the movable magnetic pole 11 and passes through the first fixed magnetic pole 12 via the gap 14. A first magnetic circuit that circulates is configured, and a second magnetic circuit that circulates from the second stator 19 to the movable magnetic pole 11 through the second fixed magnetic pole 13 via the gap 15 is configured. Further, the magnetic fluxes flowing in the two magnetic circuits are merged at the movable magnetic pole 11, and a thrust is generated between the gap 14 and the gap 15 toward the lower surface side. Therefore, the movable magnetic pole 11 moves toward the lower surface side axial direction. Become.

  The first fixed magnetic pole 12 is made of a magnetic material, and the magnetic pole portion 12a faces the inner peripheral side. The first case member 16 is fixed to the outer peripheral side of the first fixed magnetic pole 12, and the first coil 20 is present on the upper surface side. Furthermore, the magnetic pole part 12a and the magnetic pole part 11a of the movable magnetic pole 11 face each other in the radial direction, and a gap 14 exists between them.

  The second fixed magnetic pole 13 is made of a magnetic material, and the magnetic pole part 13a faces the outer peripheral side. A second case member 17 is fixed to the inner peripheral side of the second fixed magnetic pole 13, and a sleeve 23 that slides with the movable magnetic pole 11 is disposed on the outer peripheral side. The second coil 21 exists on the upper surface side of the second fixed magnetic pole 13, and the magnetic pole part 13 a and the magnetic pole part 11 a of the movable magnetic pole 11 face each other in the radial direction, and a gap 15 exists therebetween.

  The first coil 20 is located on the outer peripheral side of the movable magnetic pole 11, and the first stator 18 exists on the upper surface side, the first fixed magnetic pole 12 on the lower surface side, and the first case member 16 exists on the outer peripheral side. When a current is passed through the first coil 20, a magnetic flux is supplied to a first magnetic circuit including the movable magnetic pole 11, the first fixed magnetic pole 12, the first case member 16, and the first stator 18.

  The second coil 21 is located on the inner peripheral side of the movable magnetic pole 11, and the second stator 19 exists on the upper surface side, the second fixed magnetic pole 13 on the lower surface side, and the second case member 17 exists on the inner peripheral side. Yes. When a current is passed through the second coil 21, a magnetic flux is supplied to a second magnetic circuit including the movable magnetic pole 11, the second fixed magnetic pole 13, the second case member 17, and the second stator 19.

  Accordingly, the magnetic fluxes flowing in the two magnetic circuits are merged at the movable magnetic pole 11, and a thrust is generated between the gap 14 and the gap 15 toward the lower surface side, so that the movable magnetic pole 11 moves toward the lower surface side axial direction. Will be.

  The first case member 16 is formed of a cylindrical magnetic material, is located on the outer peripheral side of the first coil 20, and the lower surface side is fixed to the outer peripheral side of the first fixed magnetic pole 12. Further, the upper surface side is fixed to the outer peripheral side of the plate 22 and the first stator 18. When a current is passed through the first coil 20, the first magnetic circuit is configured together with the movable magnetic pole 11, the first fixed magnetic pole 12, and the first stator 18.

  The second case member 17 is formed of a cylindrical magnetic material, is located on the inner peripheral side of the second coil 21, and the lower surface side is fixed to the inner peripheral side of the second fixed magnetic pole 13. Further, the upper surface side is fixed to the inner side of the plate 22 and the second stator 19. When a current is passed through the second coil 21, the movable magnetic pole 11, the second fixed magnetic pole 13, and the second stator 19 constitute a second magnetic circuit.

  The first stator 18 is made of a magnetic material, is positioned on the upper surface side of the first coil 20, and is fixed to the first case member 16 on the outer peripheral side. The movable magnetic pole 11 is present at an appropriate interval on the inner peripheral side. When a current is passed through the first coil 20, the first magnetic circuit together with the movable magnetic pole 11, the first fixed magnetic pole 12, and the first case member 16 is provided. Configure.

  The second stator 19 is made of a magnetic material, is located on the upper surface side of the second coil 21, and is fixed to the second case member 17 on the inner peripheral side. The movable magnetic pole 11 exists on the outer peripheral side of the second stator 19 with the sleeve 23 therebetween, and when the current flows through the second coil 21, the movable magnetic pole 11, the second fixed magnetic pole 13, and the second case member 17 together with the second case member 17. The magnetic circuit is configured.

  The plate 22 is arranged on the upper surface side of the first stator 18 and the second stator 19, and the outer peripheral side is fixed to the first case member 16, and the inner peripheral side is fixed to the second case member 17. Further, since the upper surface side of the movable magnetic pole 11 is a branched portion 11c branched into a plurality in the circumferential direction, a hole 22a is provided so that the branched portion 11c of the movable magnetic pole 11 is inserted and an appropriate gap is provided. Thus, the movable magnetic pole 11 is prevented from moving. The first case member 16 on the outer peripheral side, the first stator 18, the first coil 20, the first fixed magnetic pole 12 first assembly, the inner peripheral second stator 19, the second The second assembly of the case member 17, the second coil 21, the second fixed magnetic pole 13, and the sleeve 23 is fixed and the positional relationship is maintained.

  The gap 14 is in the first magnetic circuit, and is a gap between the magnetic pole part 12 a of the first fixed magnetic pole 12 and the magnetic pole part 11 a of the movable magnetic pole 11.

  The gap 15 is in the second magnetic circuit, and is a gap between the magnetic pole part 13 a of the second fixed magnetic pole 13 and the magnetic pole part 11 a of the movable magnetic pole 11.

  The action plate 11 b fixes the movable magnetic pole 11 with a screw 24 on the upper surface side. When the movable magnetic pole 11 moves to the lower surface side, the operation is transmitted to the outside via the action plate 11b, and on the contrary, the return operation from the outside is transmitted to the movable magnetic pole 11. Further, when the movable magnetic pole 11 moves to the lower surface side, the moving range of the movable magnetic pole 11 is limited by contacting the plate 22.

  The sleeve 23 is made of a nonmagnetic material, is located on the inner peripheral side of the movable magnetic pole 11, and is inserted through the second fixed magnetic pole 13 and the second stator 19.

  Further, the operation of the solenoid according to the embodiment of the present invention will be described. 3 to 4 are explanatory diagrams from the configuration of the magnetic circuit of the solenoid to the operation, and the reference numerals are the same as those in FIGS.

  Since the purpose is to generate magnetic force and move the magnetic fluxes around the two magnetic circuits by the movable magnetic pole 11, the first coil 20 moves in the current direction 30 as shown in FIG. 21 flows in the current direction 31.

  As a result, a first magnetic circuit is formed around the movable magnetic pole 11, the first fixed magnetic pole 12, the first case member 16, and the first stator 18. Furthermore, a second magnetic circuit that surrounds the movable magnetic pole 11, the second fixed magnetic pole 13, the second case member 17, and the second stator 19 is also configured.

  As shown in FIG. 4, the magnetic flux generated by the first coil 20 flows from the movable magnetic pole 11 to the first magnetic circuit 32 including the first fixed magnetic pole 12, the first case member 16, and the first stator 18. Similarly, the magnetic flux generated by the second coil 21 flows from the movable magnetic pole 11 to the second magnetic circuit 33 including the second fixed magnetic pole 13, the second case member 17, and the second stator 19.

  At this time, the first magnetic circuit 32 and the second magnetic circuit 33 are shared inside the movable magnetic pole, and the magnetic flux flows in the same direction while repelling each other.

  The magnetic fluxes generated by the separate coils are combined at the movable magnetic pole 11, so that the magnetic pole portion 12 a of the first fixed magnetic pole 12 and the magnetic pole portion 13 a of the second fixed magnetic pole 13 act in a manner that attracts the movable magnetic pole 11. In this case, since the magnetic pole portions 12a and 13a of the two fixed magnetic poles 12 and 13 are on the same axis, a large force can be obtained.

  FIG. 5 is an explanatory diagram of a solenoid according to a second embodiment of the present invention. In FIG. 5, the reference numerals indicate the same as those in FIGS.

  FIG. 5 has the same basic structure as FIG. 1, but has a structure in which the magnetic pole part 13 a of the second fixed magnetic pole 13 is shifted to the lower side in the axial direction of the movable magnetic pole 11 with respect to the magnetic pole part 12 a of the first fixed magnetic pole 12. . In addition, the magnetic pole portion 12a of the first fixed magnetic pole 12 has a shape that partially extends in the axial direction on the upper surface side. This is designed so that the thrust of the solenoid 10 is generated over a long stroke.

  FIG. 6 shows a state before the movable magnetic pole 11 moves with respect to FIG. When currents in opposite directions are passed through the first coil 20 and the second coil 21, the first magnetic circuit 32 is formed between the movable magnetic pole 11 and the first fixed magnetic pole 12. Since the second magnetic circuit 33 is also formed in between, the movable magnetic pole 11 moves toward the lower surface side.

  FIG. 7 shows a state when the movable magnetic pole 11 approaches the magnetic pole part 12 a of the first fixed magnetic pole 12. In this state, the axial thrust generated between the movable magnetic pole 11 and the first fixed magnetic pole 12 is reduced, and the axial thrust generated between the movable magnetic pole 11 and the first fixed magnetic pole 13 is increased. Furthermore, the movable magnetic pole 11 moves in the lower surface side direction.

  Finally, as shown in FIG. 5, the movable magnetic pole 11 moves to the lower surface side, and the action plate 11b comes into contact with the plate 22 and stops. A series of these operations will be described based on the thrust diagram shown in FIG.

  The axial thrust generated at the magnetic pole portion 12a of the first fixed magnetic pole 12 is A, and the stroke range for obtaining a constant thrust is A ′. Similarly, the axial thrust generated at the magnetic pole portion 13a of the second fixed magnetic pole 13 is B, and the stroke range for obtaining a constant thrust is B ′. The two thrusts generated at the different positions are combined to form a thrust curve indicated by C, and the range of the throttle talk is A ′ + B ′ = C ′. Therefore, by shifting the magnetic pole portions 12a and 13a of the first fixed magnetic pole 12 and the second fixed magnetic pole 13 in the axial direction, it becomes possible to generate thrust over a long stroke.

It is explanatory drawing of the solenoid which concerns on 1st Example of this invention. It is explanatory drawing of the movable magnetic pole and solenoid main body of the solenoid which concern on 1st Example shown in FIG. It is sectional drawing which shows operation | movement of the solenoid shown in FIG. It is sectional drawing which shows operation | movement of the solenoid shown in FIG. It is explanatory drawing of the solenoid which concerns on the 2nd Example of this invention. It is sectional drawing which shows operation | movement of the solenoid shown in FIG. It is sectional drawing which shows operation | movement of the solenoid shown in FIG. FIG. 6 is a thrust diagram of the solenoid shown in FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Solenoid 11 Movable magnetic pole 11a Movable magnetic pole part 11b Movable magnetic pole action plate 11c Movable magnetic pole branch part 12 First fixed magnetic pole 12a First fixed magnetic pole part 13 Second fixed magnetic pole 13a Second fixed magnetic pole part 14 Gap 15 Gap 16 First case member 17 Second case member 18 First stator 19 Second stator 20 First coil 21 Second coil 22 Plate 22a Hole 23 Sleeve 24 Screw 30 Current direction 31 of first coil 31 Second coil Current direction 32 of the first magnetic circuit 33 second magnetic circuit

Claims (4)

A first coil;
A second coil located on the inner peripheral side of the first coil;
A movable magnetic pole movably disposed between the first coil and the second coil;
A first stator located on the outer peripheral side of the movable magnetic pole and located on the upper surface side of the first coil;
A second stator located on the inner peripheral side of the movable magnetic pole and located on the upper surface side of the second coil;
A first fixed magnetic pole located on the outer peripheral side of the movable magnetic pole, located on the lower surface side of the first coil, and having the magnetic pole portion directed toward the inner peripheral side;
A solenoid having a second fixed magnetic pole on an inner peripheral side of the movable magnetic pole, located on a lower surface side of the second coil, and having a magnetic pole portion directed toward the outer peripheral side. Further, a first case member located on the outer peripheral side of the first coil and fixing the first stator and the first fixed magnetic pole,
2. The solenoid according to claim 1, further comprising: a second case member that is located on an inner peripheral side of the second coil and fixes the second stator and the second fixed magnetic pole. . In the solenoid, a first magnetic circuit including the first stator, the first case member, the first fixed magnetic pole, and the movable magnetic pole;
Having two magnetic circuits, the second stator, the second case member, the second fixed magnetic pole, and a second magnetic circuit composed of the movable magnetic pole;
The movable magnetic pole has a first gap between the movable magnetic pole and the first fixed magnetic pole;
Further, the movable magnetic pole has a second gap also between the second fixed magnetic pole,
The flow of magnetic flux around the first magnetic circuit and the second magnetic circuit is merged in the movable magnetic pole so as to be in the same direction, so that the movable magnetic flux can be moved by the magnetic flux passing through the first gap and the second gap. 3. The solenoid according to claim 1, wherein thrust is generated by directing the magnetic pole in the axial direction.   In the solenoid, by shifting one of the first fixed magnetic pole and the second fixed magnetic pole in the axial direction of the movable magnetic pole, the first gap and the second gap are moved in the axial direction. The solenoid according to any one of claims 1 to 3, wherein the solenoid exists at different positions.

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