JPH0573838U - Polarized electromagnet device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a polarized electromagnet device in which the movement of the armature is less likely to be hindered by the lack of the permanent magnet. [Constitution] Coil frame 22 equipped with a coil 24 and having an inner hole 28
And the armature 33 that is supported in the inner hole of the coil frame so that it can move back and forth.
And a plate-shaped first yoke 40 that is arranged in parallel with the direction of movement of the armature and has a convex portion 41 at the center of one side, and a horizontal piece 44 and left and right side pieces 45 and 46 that are connected from both ends of the horizontal piece 44. Second yoke, which is shaped like a strip and whose left and right side pieces sandwich the first yoke
43 and the first and second yokes, and a through hole in the center
It is composed of a permanent magnet provided with 48.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a polarized electromagnet device used for an electromagnetic contactor or the like.

[0002]

[Prior Art]

 As a general polarized electromagnet device of this type, there is one having a structure shown in FIG. In the figure, reference numeral 22 denotes a coil frame, which is provided with a winding portion 23, collar portions 25 and 26 at both ends thereof, and an inner hole 28. The collar portions 25 and 26 are provided with notches 27 for facilitating fitting and fixing of a first yoke which will be described later. A first yoke 40 is provided with a convex portion 53 for fixing a permanent magnet, which will be described later, on one surface thereof, and is fitted and fixed to the collar portions 25 and 26 of the coil frame 22. Reference numeral 43 is a second yoke, and a horizontal piece 44 and left and right side pieces 45, 46 extending toward the first yoke 40 are provided at both ends thereof to form a U-shape. The second yoke 43 is formed so that the left and right side pieces 45 and 46 sandwich the first yoke 40, and the left and right side pieces 45 and 46 are fitted to the collar portions 25 and 26 of the coil frame 22. Reference numeral 47 denotes a permanent magnet, which is interposed between the first yoke 40 and the second yoke 43, and is fixed so as to be surrounded by the convex portion 53 formed on the first yoke 40.

[0003]

[Problems to be solved by the device]

 In the above-described polarized electromagnet device, the first yoke is provided with a convex portion so as to wrap the outer circumference of the permanent magnet, and the permanent magnet is fixed between the second yoke and the second yoke. No worries. However, the permanent magnet rarely rides up on this convex portion during assembly, and if magnetized in this state, the outer periphery of the permanent magnet will be chipped and this chip will enter the inner hole of the coil frame. Therefore, the advancement and retreat of Amatya was hindered.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a polar electromagnet device in which the movement of the armature is less likely to be hindered by the lack of the permanent magnet.

[0005]

[Means for Solving the Problems]

 In order to solve such a problem, a polar electromagnet device of the present invention is a coil frame equipped with a coil and having an inner hole, an armature movably supported in the inner hole of the coil frame, and an advancing / retracting direction of the armature. A plate-shaped first yoke that is arranged in parallel with the first yoke, and a horizontal piece and left and right side pieces that are connected from both ends of the first yoke form a U shape, and the left and right side pieces are arranged so as to sandwich the first yoke. In a polarized electromagnet device including two yokes and a permanent magnet interposed between the first and second yokes, a concave-convex fitting portion is formed on at least one of the first and second yokes and the permanent magnet. There is a configuration.

[0006]

[Action]

 According to this structure, the concave-convex fitting portion is formed on at least one of the first and second yokes and the permanent magnet, and the permanent magnet is sandwiched and fixed between the first yoke and the second yoke. The outer periphery of the permanent magnet is less likely to be chipped due to magnetization. Further, even if the permanent magnet is magnetized in a state where the vicinity of the concave portion rides on the convex portion and a chip occurs near the permanent magnet, the chip near the permanent magnet is held by the concave portion.

[0007]

【Example】

 An embodiment of the present invention incorporated in an electromagnetic contactor will be described below with reference to FIGS. The members having the same basic functions as those of the conventional example are designated by the same reference numerals.

That is, the electromagnetic contactor 1 is composed of the cover 2 and the base 21. The cover 2 is made of a synthetic resin, and connects the upper wall 3, the lower side walls 4 arranged on both sides of the upper wall 3, the upper wall 3 and the lower side wall 4, and divides them into a plurality of external parts. It is composed of separate 5 and internal separate 6 at the same position. External terminal fittings 7 are fixed to the outer chambers on both sides of the cover 2, which are divided by both side walls 4 and an external separate 5. This external terminal fitting 7 has a vertical insert blade 8 integrally formed on one side. The other external terminal fitting 7 is provided with a fixed contact 9 and is located in both inner chambers 10 divided by the inner separate 6. The upper wall 3 of the cover 2 is further covered with the terminal cover 11. A movable table 13 is located in the cavity 12 at the lower opening of the cover 2. The movable base 13 is formed with a lateral hole 15 at a position corresponding to the inner chamber 10 of the cover 2, in which the contact plates 16 protruding to both sides and the both ends of the contact plate 16 are attached. And a coil spring 18 for contact pressure. The contact point 17 of the movable table 13 and the contact point 9 of the cover 2 face each other in the inner chamber 10, and are separated by the movement of the movable table 13. The movable base 13 is returned by the coil spring 19, and the insulating base 20 prevents the movable base 13 from falling.

The base 21 is made of synthetic resin, and has a coil frame 22, an armature 33, first and second yokes 40 and 41, and a permanent magnet 45 therein. The coil frame 22 is composed of a winding portion 23 around which a coil 24 is wound and collar portions 25 and 26 provided with notches 27 at both ends thereof for facilitating fitting and fixing of the first yoke 40. The coil frame 22 is provided with an inner hole 28 into which the armature 33 is inserted. In addition, the right collar 26 is provided with a groove 29 for inserting and mounting the blade receiving terminal fitting 30 to which the coil 24 is connected.When the base 21 and the cover 2 are combined, Insert the plug blade 8 into 30 and complete the electrical connection with the coil 24. The armature 33 is formed in an H shape by the left and right side pieces 34, 35 and a horizontal rod 36 connecting the left and right side pieces 34, 35. A mountain-shaped flat spring 37 for applying a pressing force in the opposite direction to the coil spring 19 is fixed to the left side piece 34 so that the armature 33 can move to the right when a current is applied to the coil 24. In addition, in order to prevent the armature 33 from coming off, the left and right ends 33a and 33b are provided with the non-magnetic material plates 38 and 39.

The first yoke 40 is provided with two columnar projections 41, 41 and a notch 42 for fitting and fixing the flanges 25, 26. The second yoke 43 is formed in a U shape by the horizontal piece 44 and the left and right side pieces 45, 46 connected from both ends thereof, and the distance between the left and right side pieces 45, 46 is longer than that of the first yoke 40. The left and right side pieces 45 and 46 are fitted to the collar portions 25 and 26 of the coil frame 22 so as to sandwich the first yoke 40. The permanent magnet 47 is provided with recesses 48, 48 at its center so that the projection 41 of the first yoke 40 fits therein, and is interposed between the first yoke 40 and the second yoke 43.

The reversing lever 49 hooks the upper end to the notch 14 of the movable base 13 and passes the shaft 50 through the lower end. The shaft 50 is fitted into the groove 52 of the connecting body 51 from above and the right side of the armature 33. The end 33b is inserted into the connecting body 51. In addition, as a method of supporting the reversing lever 49, the shaft 31 is passed through the center thereof, and the shaft 31 is supported by the shaft hole 32 of the right flange portion 26 of the coil frame 22. The reversing lever 49 moves the armature 33 in the Z direction by an electromagnetic force, presses the lower end of the reversing lever 49 with the right end 33b of the armature 33, rotates about the shaft 31, and moves the movable table 13 to the left in FIG. Move in the direction.

Next, the operating principle of the armature 33 of this embodiment will be described with reference to FIG. In order to explain the operation, the inner and outer side surfaces of the left and right side pieces 34, 35 of the armature 33 are defined as the contact surfaces 34a, 34b, 35a, 35b, and the inner and outer contact surfaces 34a, 34b, 35a, 35b are the first contact surfaces. And facing the inner and outer pole faces 40a, 40b, 45a, 46a of the second yoke 40, 43 to form air gaps a, b, c, d, respectively. The solid line X is the magnetic flux of the permanent magnet 45, and the dotted line Y is the magnetic flux of the coil.

In FIG. 5, the magnetic flux X of the permanent magnet 47 is the N pole of the permanent magnet 47 → the first yoke 40 → the air gaps b and c → the left and right side pieces 34 and 35 of the armature 33 → the air gaps a and d → The left and right side pieces 45, 46 of the second yoke 43 → the horizontal piece 44 → the S pole can be traced. When an electric current is applied in the direction A, the magnetic flux Y of the coil 24 is: coil 24 → horizontal bar 36 of the armature 33 → right side piece 35 → air gap d → right side piece 46 of the second yoke 43 → horizontal piece 44. → Left side piece 45 → Air gap a → Left side piece 34 of Amatya 33 → Horizontal bar 36 of Amatiya 33 Further, the air flows from the right side piece 35 of the Amaya 33 to the air gap c → the first yoke 40 → the air gap b → the left side piece 34 of the Amachiya 33 → the horizontal bar 36 of the Amachiya 33. Here, comparing the air gaps a, b, c and d, the directions of the magnetic fluxes X and Y of the permanent magnet 47 and the coil 24 are the same in the air gaps b and d, and the air gaps a and c are opposite to each other. Is becoming

Therefore, the first and second yokes 40 and 43 and the armature 33 cancel each other in the opposite directions of the magnetic fluxes X and Y, and overlap in the same direction to exert an attractive force. Therefore, in FIG. 33 moves to the left as indicated by arrow Z, and the circumscribed pole surface 35b of the right side piece 35 of the armature 33 is adsorbed to the inscribed pole surface 46a of the right side piece 46 of the second yoke 43, and further the left side piece 34 of the armature 33. The inscribed pole face 34b is attracted to the circumscribed pole face 40a of the first yoke 40. Then, when the current stops flowing, the movable base 13 is pushed in the W direction by the coil spring 19 as shown in FIG. 2, and the armature 33 is attracted by the magnetic flux of the permanent magnet 47 via the reversing lever 49. Moved away from.

In general, a place that is easily chipped due to magnetization is a place where the projecting portion is mounted. Therefore, in the polarized electromagnet device of the present embodiment, the outer periphery of the permanent magnet 47 is less likely to be chipped. Even if the permanent magnet 47 is chipped due to magnetization, the chipped portion is near the through hole 48 of the permanent magnet 47, so the chipped portion is held in the through hole 48 of the permanent magnet 47 and is hard to come out.

According to the present embodiment, the first yoke is provided with the convex portion and the permanent magnet is provided with the through hole. However, at least one of the first and second yokes and the permanent magnet are fitted in a concavo-convex shape. It can be applied as long as it has a section. Further, the irregularities referred to here are dents and large portions, and also include holes that do not penetrate, that is, concave shapes. In addition, the irregularities are provided so as not to be applied to the side surface of the permanent magnet. Further, the fitting portion is not limited to one having a corresponding shape, and may be, for example, a cylindrical shape and a conical shape, or a triangular pillar shape and a cylindrical shape.

[0017]

[Effect of the device]

 In the present invention, as described above, the concave-convex fitting portion is formed on at least one of the first and second yokes and the permanent magnet, and the permanent magnet is sandwiched and fixed between the first yoke and the second yoke. Therefore, a chip due to magnetization is unlikely to occur on the outer circumference of the permanent magnet. In addition, even if the permanent magnet is magnetized in a state where the concave part is riding on the convex part and a chip occurs near the permanent magnet, the chip near the permanent magnet is retained by the concave part. The effect that the advance and retreat of Amatya is less likely to be hindered is achieved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an electromagnetic contactor to which an embodiment of the present invention is applied.

FIG. 2 is a vertical sectional view thereof.

FIG. 3 is an exploded perspective view thereof.

FIG. 4 is a vertical cross-sectional view seen from the side surface thereof.

FIG. 5 is a diagram for explaining the operation of the armature.

FIG. 6 is an exploded perspective view showing a conventional polarized electromagnet device.

[Explanation of symbols]

 33 Amachiya 34 Left side piece 35 Right side piece 36 Horizontal bar 40 1st yoke 41 Convex section 42 Notch section 43 Second yoke 44 Horizontal piece 45 Left side piece 46 Right side piece 47 Permanent magnet 48 Through hole

Claims (1)

[Scope of utility model registration request] 1. A coil frame equipped with a coil and having an inner hole, an armature movably supported in the inner hole of the coil frame, and a plate-shaped first member arranged in parallel with the armature moving direction.
The yoke, the horizontal piece, and the left and right side pieces connected from both ends of the yoke form a U-shape, and the left and right side pieces sandwich the first yoke, and the second yoke and the first and second yokes. A polar electromagnet device comprising a permanent magnet interposed therebetween, wherein a concave-convex fitting portion is formed on at least one of the first and second yokes and the permanent magnet.