JPH088505Y2 - Structure of electromagnet - Google Patents

Description

TECHNICAL FIELD The present invention relates to a structure of an electromagnet of a seesaw amateur type polarized relay.

[Background Art] A coil is wound between magnetic poles of a substantially U-shaped iron core, both ends corresponding to the magnetic poles are magnetized to the same pole, and the central portion between both magnetic poles is both ends. In this type of seesaw amateur type electromagnet, which is composed of permanent magnets magnetized to different poles and an armature that is rectangular and has a fulcrum in the center and pivotally supported on the permanent magnet, In order to ensure the magnetic stroke with high accuracy, it is necessary to insert the permanent magnet with high accuracy into the magnetic pole surface of the iron core.

[Object of the Invention] The present invention has been provided in view of the above points, and provides a structure of an electromagnet aiming to secure a magnetic stroke with high accuracy in order to stably obtain magnetic attraction force characteristics. To do.

DISCLOSURE OF THE INVENTION (Structure) The structure of the electromagnet according to the present invention has a substantially U-shaped iron core around which a coil is wound, and is interposed between magnetic poles of the iron core, and both ends corresponding to the magnetic pole are the same. A permanent magnet, which is magnetized to a pole and whose central portion between both magnetic poles is different in polarity from both ends, and a fulcrum that is rectangular and engages with the central portion of the permanent magnet A seesaw amateur electromagnet consisting of an armature pivotably supported on a permanent magnet so that each end thereof faces a magnetic pole surface that is a tip end surface of each leg of an iron core, A brim made of an insulating material that projects the coil winding range is projected from each end of the horizontal piece of the iron core, and each leg of the iron core is covered with each bristle leaving the tip, and the brim is made of iron. A recess is formed on the tip side of the leg piece of the core and on the facing surface of the collars, and a receiving portion is formed to which each end of the permanent magnet is fitted. The distance between the bottom parts are those formed by set larger than the thickness of the end portion of the permanent magnet.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, the configuration of the entire relay will be described. As shown in FIG. 3, the casing 1 is a box-shaped base 11 opened upward.
And a cover 12 having a box-like shape opened downward and fitted over the base 11 from above the side wall of the base 11.

The base 11 is a molded product of an insulating material such as a synthetic resin formed in a substantially rectangular parallelepiped shape, and on both side walls in the width direction, recesses 13 whose upper and inner side surfaces are open at the center in the longitudinal direction are formed. It is formed. A contact piece 21 faces the bottom surface of each recess 13, and the contact piece 21 is formed of a conductive plate integrally with a common terminal piece 22 that is exposed outside the widthwise side wall of the base 11 and projects downward. . Ribs 14 that run vertically and whose upper ends are located below the upper surface of the base 11 are formed at the four inner corners of the base 11. A fixed contact plate 24 having a fixed contact 23 on the upper surface of the rib 14 overlaps with the fixed contact plate 24.
Is formed of a conductive plate integrally with a fixed terminal piece 25 that is exposed to the outside of the side wall of the base 11 in the width direction and projects downward. On both side walls in the longitudinal direction of the base 11 are formed notches 15 which are open in the upper and lower sides of the side wall at the center in the width direction, and a pair of coil terminal coupling pieces is formed from the bottom of each notch 15. 26 is projected upward. The coil terminal coupling piece 26 is formed of a conductive plate integrally with the coil terminal piece 27 that is exposed to the outside of both side walls of the base 11 in the width direction and projects downward. In this way, the contact piece 21 and the common terminal piece
The fixed contact plate 24, the fixed terminal piece 25, the coil terminal coupling piece 26, and the coil terminal piece 27 are integrally formed of conductive plates, and the base 11 and the conductive plates are integrated by insert molding. . The conductive plate is routed within the side wall of the base 11 so that the conductive plate is installed over substantially the entire length of the side wall of the base 11. Therefore, the side wall of the base 11 is reinforced by the conductive plate, and the strength of the base 11 is increased due to the box shape of the base 11.

The cover 12 is a molded product of an insulating material such as a synthetic resin formed in a substantially rectangular parallelepiped similar to the base 11, and has four partitions 16 protruding downward from the inner peripheral surface of the upper wall. ing. The partition 16 is formed along the longitudinal direction of the cover 12.

Casing 1 formed by base 11 and cover 12
Inside, a coil block 3, a permanent magnet 4 and an armature block 5 are arranged.

As shown in FIG. 1, in the coil block 3, the coil 32 is wound around the horizontal piece 31b of the substantially U-shaped iron core 31 which is opened upward, and the leg pieces 31a of the iron core 31 are made of an insulating material. It is covered with a collar 33 formed of (insulating member), and is formed in such a shape that the magnetic pole surface of the tip end portion of the leg piece 31a is exposed from one place on the peripheral surface of the collar 33. Therefore, as is apparent from FIG. 2, the winding range of the coil 32 is restricted by the collar 33, and the horizontal piece 31b of the iron core 31 and the collar 33 function as a coil bobbin. The coil terminal 34 connected to the coil 32 is
A pair of them are provided corresponding to the above, and are bent so as to project above the upper end of the collar 33 and to come into contact with the coil terminal coupling piece 26. Coil block 3 is base 11
The coil terminal 34 and the coil terminal coupling piece are housed inside.
26 is electrically and mechanically connected by a method such as welding or soldering. The permanent magnet 4 is interposed between the exposed portions of the leg pieces 31a of the iron core 31 so that the magnetic poles are in contact with each other.

The permanent magnet 4 has a plate-like shape, and a concave groove 41 having a substantially semicircular cross section and running in the width direction of the base 11 is formed in the center of the upper surface.
The upper surface of the permanent magnet 4 is an inclined surface 42 that is inclined so that the central portion in the longitudinal direction of the base 11 has the largest thickness and the thickness gradually decreases toward the ends. Also,
Both ends of the permanent magnet 4 in the longitudinal direction of the base 11 are magnetized to the same pole, and the central portion is magnetized to a different magnetic pole. That is, as shown in FIG. 5, if both ends are N poles, the central portion is magnetized to be S poles. Then, the two magnetic poles at both ends thereof are in contact with the inner surface of each leg piece 31a of the iron core 31 of the coil block 3 so that both leg pieces 31a, 31a.
It is interposed between them. Here, as shown in FIG. 1, recessed receiving portions 35 communicating with the inner side surfaces of the leg pieces 31a of the iron core 31 are formed in the upper portions of the inner side surfaces of the brim 33, respectively. The receiving portions 35 respectively receive the end portions of the permanent magnets 4, and the insulating member forming the flanges 33 serves as both the so-called flange portion of the coil block 3 and the receiving portion of the permanent magnets 4. is there. Further, as shown in FIG. 2, the bottom surface of the receiving portion 35 and the magnetic pole surface of the iron core 31 are formed to have a necessary dimension H with high accuracy, and the space between the magnetic pole and the permanent magnet 4 when the permanent magnet 4 is inserted is formed. The dimensions are secured. Therefore, the receiving portion 35 allows the permanent magnet 4
Is accurately positioned, so that the magnetic stroke is accurately secured and stable magnetic attraction force characteristics are obtained.

The armature block 5 includes a magnetic armature 51 formed in a substantially rectangular flat plate shape, and a movable contact spring piece 52 disposed on substantially the same plane as the armature 51 on both sides of the armature 51 in the width direction. ,
The armature 51 and the movable contact spring piece 52 are integrally formed with a spring support 53 which is a molded product of an insulating material such as synthetic resin. No. 4 on the bottom surface of the armature 51.
As shown in the figure, a ridge 54 having a substantially semicircular cross-section that runs in the width direction of the armature 51 is formed. The movable contact spring piece 52 is an elongated conductive leaf spring, and a support piece 55 having a substantially T-shaped tip is integrally provided at the center in the longitudinal direction so as to extend in the width direction. In addition, slits 56 are formed at both ends in the longitudinal direction so that the slits 56 open at the ends, so that the ends of the movable contact spring pieces 52 are easily bent. The spring support 53 is formed with notches 57 that open at both edges of the armature 51 in the width direction. A support piece 55 is provided so as to project from the deep end of the notch 57, and the tip end portion of the support piece 55 projects outward from the spring support body 53 in the width direction of the armature 51. In this armature block 5, the protrusion 54 provided on the lower surface of the armature 51 is housed in the recessed groove 41 of the permanent magnet 4, and the support piece 55 is fitted into the recess 13 provided in the side wall of the base 11 to form a base. The armature block 5 is arranged at a fixed position in the armature 11 and can swing about the support piece 55 as an axis.

That is, the receiving portion 35 is formed in the collar portion 33, which is an insulating member fixedly provided to the iron core 31, and the receiving portion 35 is formed.
The permanent magnet 4 and the iron core 31 are positioned by fitting both ends of the permanent magnet 4 to each other, and the fulcrum of the armature 51 with respect to the permanent magnet 4 is engaged in a concavo-convex manner. As a result of the higher positioning accuracy between the magnetic pole surface of the core 31 and the fulcrum of the armature 51, the accuracy of the magnetic stroke of the armature 51 increases.

As described above, the cover 12 is fitted to the base 11 with the coil block 3 and the armature block 5 of the permanent magnet 4 housed in the base 11. The four partition pieces 16 projectingly provided on the inner peripheral surface of the cover 12 are inserted into the gaps between the armature 51 and the movable contact spring piece 52 while the cover 12 is fitted on the base 11, and contact each other. Since the insulating partition 16 is interposed between the pole 51 and the movable contact spring piece 52, a large insulation distance can be secured between them.

With the above configuration, when the coil 32 is energized, one end portion of the armature 51 in the longitudinal direction is attracted by one leg piece of the iron core 31 according to the direction of magnetization, and the armature block 5 swings, so that the iron Core 31
→ Armature 51 → Permanent magnet 4 → Iron core 31 closed magnetic circuit is formed,
One end of the movable contact spring piece 52 in the longitudinal direction comes into contact with the corresponding fixed contact 23. When the energization of the coil 32 is stopped in this state, the closed magnetic circuit is maintained as it is due to the magnetic force of the permanent magnet 4, and the state where the armature 51 is in contact with one of the iron cores 31 is maintained. Further, by reversing the energization direction to the coil 32, the armature 51 is attracted to the other leg piece of the iron core 31, and the other end of the movable contact spring piece 52 in the longitudinal direction corresponds to the fixed contact 23. To contact. Even in this state, the current state is maintained after the power supply is stopped, and so-called bistable operation can be performed.

[Advantage of the Invention] As described above, the present invention is interposed between a substantially U-shaped iron core around which a coil is wound and a magnetic pole of the iron core, and both ends corresponding to the magnetic pole are magnetized to the same pole. The center portion between the two magnetic poles has a permanent magnet magnetized to have a different polarity from the both ends, and a rectangular fulcrum that engages with the center portion of the permanent magnet at the center portion. In a seesaw-amateur type electromagnet consisting of an armature pivotably supported on a permanent magnet so that each part faces the magnetic pole surface, which is the tip surface of each leg of the iron core, A collar made of an insulating material that regulates the winding range of the coil is protrudingly provided at each end of the piece, and each leg piece of the iron core is covered with each collar leaving the tip end. Forming a receiving portion formed in a concave shape that opens at the tip end side of the and the facing surfaces of the collars and into which each end of the permanent magnet fits, and the distance between the magnetic pole surface of the iron core and the bottom surface of the receiving portion is formed. The separation is set to be larger than the thickness of the end portion of the permanent magnet, and a concave receiving portion is formed in the flange fixedly provided on the iron core, and each end portion of the permanent magnet is formed in the receiving portion. , The positioning accuracy of the permanent magnet with respect to the iron core is improved. Since the armature is pivotally supported on the permanent magnet by engaging the fulcrum in a concavo-convex manner, the accuracy of the position of the permanent magnet with respect to the iron core increases, which in turn increases the position accuracy of the armature with respect to the iron core. In addition, the accuracy of the magnetic stroke of the armature is increased, and a stable magnetic attraction force characteristic can be obtained.
Moreover, a brim of an insulating material is provided at each end of the horizontal piece of the iron core,
Since the winding range of the coil is regulated by this flange, the essential member that functions as a coil bobbin is also used for positioning the permanent magnet, and the permanent magnet is accurately positioned to stabilize the operation of the armature. However, it has the advantage of not increasing the number of components. Further, when the manipulator or the like is used to grasp the brim during automatic assembly, there is also an effect that the iron core that affects the magnetic characteristics is not damaged and the handling at the time of assembly is facilitated.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an essential part of an embodiment of the present invention, FIG. 2 is a sectional view of the same as above, FIG. 3 is an exploded perspective view of the same as above, and FIG. FIG. 5 and FIG. 5 are configuration diagrams of the same. 3 is a coil block, 4 is a permanent magnet, 5 is an armature block, 31 is an iron core, 31a is a leg piece, 31b is a horizontal piece, 32 is a coil, 33
Is a tsuba, and 35 is a receiving part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-58-46608 (JP, A) JP-B 60-22809 (JP, B1) JP-B 59-43802 (JP, B1)

Claims (1)

[Scope of utility model registration request] 1. A substantially U-shaped iron core around which a coil is wound and a magnetic pole of the iron core are interposed, both ends corresponding to the magnetic pole are magnetized to the same pole, and a central portion between the both magnetic poles. Is a permanent magnet magnetized to have a different polarity from both ends, and a rectangular fulcrum in the center that engages with the center of the permanent magnet in a concave-convex manner. In a seesaw amateur type electromagnet consisting of an armature swingably supported on a permanent magnet so as to face the magnetic pole surface which is the tip surface of the piece, a coil is provided at each end of the horizontal piece of the iron core. A collar made of an insulating material that regulates the winding range is projected, and each iron core leg piece is covered with each collar leaving the tip end, and the tip side of the iron core leg piece and the collars face each other. The end of the permanent magnet is defined as the distance between the magnetic pole surface of the iron core and the bottom surface of the permanent magnet. Structure of the electromagnet, characterized by comprising set to be larger than the law.