JPH0883710A - Ac electromagnet - Google Patents

Abstract

PURPOSE: To suppress the generation of a beat sound, and to obtain a stabilized movement by a method wherein a shading coil is attached to an armature and the fixing part of the shading coil is provided on the part other than the surface opposing to an iron core. CONSTITUTION: A coupling part is provided along the side of a magnetic pole surface 1a on a shading coil 6 when an armature 5 is attracted to the magnetic pole surface 1a of a core 1, other end is positioned almost in the center of the widthwise direction of the core 1, and one end is provided on the position deviated from the magnetic pole surface 1a. When an AC current is applied to a coil 3, the magnetic flux, which is smoothed by the shading coil 6, flows on a magnetic path, and the magnetic attraction force, which works between the core and the armature 5, is increased by the spring energizing force, the armature 5 is attracted to the magnetic pole surface 1a of the core 1, and the armature 5 returns to its original state when the application of current to the coil 3 is stopped. Accordingly, the magnetic pole surface between the core 1 and the armature 5 is not roughened by the fixing of the shading coil 6.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an alternating current electromagnet.

[0002]

2. Description of the Related Art Conventional AC electromagnets include those shown in FIGS. It should be noted that only the main parts are shown in the figure, and illustrations of, for example, an armature and a coil are omitted.

In FIG. 1, reference numeral 21 denotes a yoke, which is made of a magnetic material such as electromagnetic soft iron having a substantially L shape, and an iron core 20 is fitted into a hole provided at one end of the yoke and is magnetically stable joined thereto. The iron core 20
A stepped recess 20c is formed in the magnetic pole surface 20a, and a substantially square-shaped shading coil 22 is housed therein and is caulked and fixed to the step 20b.

[0004]

In the AC electromagnet described in the conventional example, the pressure applied when the shading coil 22 is caulked and fixed to the stepped portion 20b of the iron core 20 causes the magnetic pole surface portions (20a and 20b) to move. Roughness and deformation are likely to occur, and there is a problem that when an unillustrated amateur is attracted to the iron core 20, a growl, which is a problem peculiar to the AC electromagnet, occurs.

The present invention has been made in view of the above problems and has been improved. An object of the present invention is to provide an AC electromagnet in which no growling occurs.

[0006]

According to a first aspect of the AC electromagnet of the present invention, the shading coil is attached to an armature, and a fixing portion of the shading coil is provided on a surface other than the iron core facing surface.

According to a second aspect of the present invention, in the alternating current electromagnet according to the first aspect, the decoupling coil is fixed by laser welding.

According to another aspect of the AC electromagnet of the present invention, a long hole having a width larger than the width of the iron core is formed substantially at the center of the iron core facing surface of the armature, and the iron core facing portion is notched in the long hole.
Shaped kumadori coil is fitted.

According to a fourth aspect of the present invention, in the AC electromagnet according to the third aspect, a mounting hole is provided in a portion other than the iron core facing surface of the armature, and the oblong hole and the mounting hole are substantially U-shaped. The coil is attached.

[0010]

According to the AC electromagnet of claim 1, since the decoupling coil is attached to the armature and the fixing portion of the decoupling coil is provided on a surface other than the iron core facing surface, the adhesion of the decoupling coil causes the iron core and the armature to be separated from each other. Does not damage the magnetic pole surface.

The AC electromagnet according to claim 2 is the AC electromagnet according to claim 1, wherein the squeeze coil is fixed by laser welding, so that no unnecessary pressing force is applied to the fixed part of the armature and the deformation of the armature is prevented. Can be achieved.

According to a third aspect of the AC electromagnet of the present invention, a long hole having a width larger than the width of the iron core is formed substantially in the center of the iron core facing surface of the armature, and the iron core facing portion is notched in the long hole. Since a shape-shaped shading coil is fitted and fixed on the back side of the iron core facing surface, the shading coil can be easily attached without roughening the magnetic pole surfaces of the iron core and the armature.

An AC electromagnet according to a fourth aspect is the AC electromagnet according to the third aspect, in which an attachment hole is provided in a portion other than the iron core facing surface of the armature, and the oblong hole and the attachment hole are substantially U-shaped. Since the coil is fitted and fixed, the decoupling coil can be firmly and reliably attached.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In the figure, the AC electromagnet is composed of an iron core 1, a coil 3, a yoke 4, an armature 5, a shading coil 6 and the like. The iron core 1 has a coil frame 2 around which a coil 3 is wound, and has a pole face 1a formed at one end thereof and the other end 1b magnetically joined to one end 4a of the yoke 4. . A substantially U-shaped protrusion 2a is integrally formed at one end of the coil frame 2.

The yoke 4 is made of a substantially L-shaped magnetic metal body, and an iron core 1 having the coil frame 2 inserted therein is provided inside the bent portion thereof so that the other end 4b and the iron core 1 are arranged side by side. Is configured. At the other end 4b of the yoke 4, an armature 5 urged by a spring 7 in a direction of separating from the magnetic pole surface 1a of the iron core 1 is swingably supported by a hinge. The spring 7 has one end attached to the base of the armature 5 and the other end attached to a cut-and-raised portion 4c formed in the middle of the other end 4b of the yoke 4.

The armature 5 is made of a substantially flat magnetic metal body and has an iron core facing surface 5a formed on one surface thereof and the iron core 1 and a free end thereof abutting on a projection 2a provided on the coil 2. The projection 2a functions as a return stopper for the amateur 5. Further, in this amateur 5, as shown in FIG. 1, the width of the iron core 1 is larger than the substantial center of the iron core facing surface 5a and the portion other than the iron core facing surface 5a near the hinge support portion 5b. Long holes 5c and 5c for fixing the shading coil 6 are formed.

The shading coil 6 is made of a metal body such as copper having a substantially U-shaped cross section. Both ends 6a and 6b are fitted into the two elongated holes 5c and 5c, respectively, and the magnetic pole facing surface 5a of the armature 5 is covered. The fixed portions 6d, 6d protruding from the back surface are welded by irradiating a laser beam, and the bottom surface portion facing the magnetic pole surface 1a of the iron core 1 is cut out and the connecting portions 6 are formed on both sides.
c and 6c are formed.

The shading coil 6 is formed by the amateur 5
Is attracted to the magnetic pole surface 1a of the iron core 1, the connecting portions 6c, 6
c is provided on the side of the magnetic pole surface 1a and the other end 6b is provided.
Is located approximately in the center of the iron core 1 in the width direction, and one end 6a is the magnetic pole surface 1
It is provided at a position deviated from a, and is provided at the same position as when the caulking coil 22 is caulked and fixed to the iron core 20 described in the conventional example, that is, a position where the division ratio is suitable. In addition, this kumadori coil 6
If the split ratio is suitable, the long hole 5 of the amateur 5
It is not necessary to provide a bent portion for fitting on the one end 6a side fitted in c, in which case the mounting hole 5c of the amateur 5 is naturally unnecessary, and the magnetic path in the amateur 5 can be made large, so that the magnetic efficiency is further improved. be able to.

In this AC electromagnet, when an AC current is applied to the coil 3, the magnetic flux smoothed by the shading coil 6 flows in the magnetic path, and the magnetic attraction force acting between the iron core 1 and the armature 5 is the spring biasing force of the spring 7. When the armature 5 becomes higher, the armature 5 is attracted to the magnetic pole surface 1a of the iron core 1, and the energization of the coil 3 is stopped, the armature 5 returns to its original state by the spring 7.

FIGS. 3 (a) and 3 (b) show other embodiments respectively, and only the points that are particularly different from the above embodiments will be described in detail.

In the figure, numeral 14 is an amateur, and a substantially U-shaped window hole 14c having substantially the same shape as the shading coil 22 described in the conventional example is formed on the magnetic pole facing surface facing the magnetic pole surface of the iron core 10. A substantially L-shaped shading coil 15 is fitted into both ends of the window hole 14c from above, and one end 15b is provided so as to be located on the side of the magnetic pole surface of the iron core 10 and the magnetic poles face each other. The other end is fixed to the back surface by a method such as laser welding, so that the shading coil 15 is formed at a position where the division ratio is optimum when the armature 14 operates.

[0023]

According to the AC electromagnet of the first aspect of the present invention, since the decoupling coil is attached to the armature and the fixing portion of the decoupling coil is provided on a surface other than the iron core facing surface, the adhesion of the decoupling coil causes the iron core and the armature to be fixed. Since the magnetic pole surfaces of and are not roughened, it is possible to suppress the occurrence of a conventional beat and to obtain a stable operation.

In the AC electromagnet according to claim 2, in the AC electromagnet according to claim 1, since the shaving coil is fixed by laser welding, unnecessary fixing force is not applied to the fixing part of the armature and deformation of the armature is prevented. It is possible to suppress the occurrence of howling.

In the AC electromagnet according to a third aspect of the present invention, a long hole larger than the width of the iron core is formed substantially at the center of the iron core facing surface of the armature, and the iron core facing portion is notched in the long hole.
Shaped kumadori coil is inserted into one end and fixed on the back side of the iron core facing surface, so it is possible to suppress barking without ruining the magnetic pole surfaces of the iron core and the armature, and to fit into the long hole of the armature. Since the shading coil can be temporarily fixed in this state, the work for fixing the shading coil by welding, caulking or the like becomes easy.

According to a fourth aspect of the present invention, in the alternating current electromagnet according to the third aspect, mounting holes are provided in portions other than the iron core facing surface of the armature, and the oblong holes and the mounting holes are substantially U-shaped. Since the coil is inserted and fixed, it is possible to more firmly and surely attach the shading coil to the amateur.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a main part of an embodiment of the present invention,

FIG. 2 is a side view of a partial cross section showing the entire AC electromagnet,

FIG. 3 (a) is a plan view showing another embodiment of the present invention, and FIG. 3 (b) is a side view of a partial cross section.

FIG. 4 is a perspective view showing a main part of a conventional example,

FIG. 5 is likewise a sectional view of a main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 iron core 1a magnetic pole surface 3 coil 4 yoke 4a one end 4b other end 5 armature 5a iron core facing surface 6 shading coil 6a fixing part

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 19, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

FIG. 3 is a plan view and a side view showing another embodiment of the present invention,

Claims (4)

[Claims] 1. An iron core, around which a coil is wound, is magnetically attached to one end of a substantially L-shaped yoke, and the other end of the yoke is provided to face a magnetic pole surface of the iron core so as to be separable and separable. In an AC electromagnet for swingably attaching an armature and providing a shading coil at a position where the split ratio between the iron core and the armature is suitable and smoothing an AC magnetic flux to perform an opening / closing operation, the shading coil is provided on the amateur At the same time, an AC electromagnet is characterized in that the fixing portion of the shading coil is provided on a surface other than the iron core facing surface. 2. The alternating current electromagnet according to claim 1, wherein the fixing of the rake coil is performed by laser welding. 3. An iron core, around which a coil is wound, is magnetically attached to one end of a substantially L-shaped yoke, and the other end of the yoke is provided so as to oppose the magnetic pole surface of the iron core so as to be separable and separable. An AC electromagnet that swingably attaches an armature and that has a substantially square-shaped shading coil at a position where the split ratio between the iron core and the armature is suitable, smoothes the AC magnetic flux, and performs an opening / closing operation. A long hole larger than the width of the iron core is formed substantially at the center of the iron core facing surface, and a substantially L-shaped shading coil having a notched iron core facing portion is inserted into the long hole, and the back surface of the iron core facing surface is inserted. An alternating current electromagnet characterized in that it is fixed on the side. 4. The AC electromagnet according to claim 3, wherein a mounting hole is provided in a portion other than the iron core facing surface of the amateur, and a substantially U-shaped shading coil is fitted and fixed in the elongated hole and the mounting hole.