JPH0636182U - Controller iron core - Google Patents

Abstract

(57) [Summary] [Purpose] To achieve low wear and low noise. [Structure] A flexible shock absorbing material 13 is fitted, for example, in a void portion of the movable iron core 10 or the fixed iron core 11 generated when the movable iron core 10 is suction-adsorbed to the fixed iron core 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a controller core such as an electromagnetic contactor, an electromagnetic switch and an electromagnetic relay.

[0002]

[Prior art]

 Iron cores used in electromagnetic control devices such as electromagnetic contactors, electromagnetic switches, and electromagnetic relays are composed of fixed iron cores and movable iron cores. These iron cores have a shape generally called an E-shaped core. An electromagnetic coil is wound around the center leg of the E-shaped fixed iron core, and the fixed iron core is excited by passing a current through the electromagnetic coil to attract and adsorb the E-shaped movable iron core. Normally, when the fixed iron core and the movable iron core are attracted to each other, the tip of the central leg of the E-shaped core does not come into contact with each other to form a void. This is to prevent the iron core from being attracted by the residual magnetic flux when the current supply to the electromagnetic coil is cut off.

[0003]

[Problems to be solved by the device]

 By the way, non-oriented silicon steel plates are generally used for the fixed core and the movable core. Although this material has excellent magnetic properties, it has the drawback of being hard and brittle. In particular, there is a problem in that the movable core is attracted to the fixed core and collides with each other due to the impact, and the abrasion powder deteriorates the contact reliability.

FIG. 5 shows the relationship of the failure rate depending on the amount of iron powder inside the electromagnetic relay. It can be seen that when the amount of iron powder is large, the number of failures is large, and conversely, when the amount of iron powder is small, the number of failures is small. In addition, the collision noise generated when the fixed iron core and the movable iron core were attracted by suction was large, and it was desired to reduce the noise.

The present invention has been made to solve the above problems, and provides an iron core that can be configured with low wear and low noise in a controller iron core such as an electromagnetic contactor, an electromagnetic opener, and an electromagnetic relay. The purpose is to do.

[0006]

[Means for Solving the Problems]

 The controller iron core of the present invention is characterized in that the movable iron core or the fixed iron core is provided with a flexible shock absorbing material, for example, fitted in the void portion of the movable iron core generated when the movable iron core is attracted and attracted to the fixed iron core. .

[0007]

[Action]

 With such an iron core structure, when the movable iron core is attracted and adsorbed to the fixed iron core, it first collides with the flexible shock absorbing material and then the fixed iron core and the movable iron core are adsorbed, so that the fixed iron core and the movable iron core move. The iron core collision will be softened. In addition, the impact cushioning material does not come off due to the impact cushioning material being fitted therein.

[0008]

【Example】

 An embodiment of the present invention will be described with reference to FIG. In FIG. 1, the controller iron core is composed of a movable iron core 10 and a fixed iron core 11 each of which is formed by laminating non-oriented silicon steel sheets, and the length of the center leg of the movable iron core 10 is It is shorter than the length of both legs. An electromagnetic coil 12 is wound around the center leg of the fixed iron core 11, and a flexible shock absorbing material 13 such as rubber is provided on the tip of the center leg.

When a current flows through the electromagnetic coil 12, the fixed iron core 11 is excited and the movable iron core 10 is attracted and attracted. At this time, the tip ends of the central legs of the movable iron core 10 come into contact with the shock absorbing material 13, and after the impact absorbing material 13 is pushed in, the fixed iron core 11 and the tip parts of both side legs of the movable iron core 10 come into contact with each other. As a result, collisions at both ends of the iron core are softened, and wear at both ends and collision noise are reduced. It is desirable that the thickness of the shock absorbing material 13 be made slightly thicker than the size of the void so that the movable iron core 10 is deformed by the force of being sucked and adsorbed so that the tip portions of both legs of the iron core can come into contact with each other. FIG. 2 shows an example in which the shock absorbing material 13 is provided on the fixed iron core 11. An inverted T-shaped convex portion as shown in the figure is provided on the bottom surface of the shock absorbing material 13, a hook-like concave portion as shown in the figure is provided on the fixed iron core 11, and an adhesive 14 is provided on the convex portion of the shock absorbing material 13. It is applied and fitted into the recess of the fixed iron core 11 to be fixed. In this way, it is preferable to prevent the shock absorbing material 13 from being separated from the fixed iron core 11 due to a shock.

FIG. 3 shows wear characteristics of the iron core using the shock absorbing material of this embodiment and the iron core not using the conventional shock absorbing material. As is clear from FIG. 3, the iron core of this example has a wear amount reduced by 30 to 40% as compared with the conventional iron core.

FIG. 4 shows noise characteristics at the time of power-on of the electromagnetic switch made of the iron core using the shock absorbing material of the present embodiment and the electromagnetic switch made of the iron core not using the conventional shock absorbing material. In FIG. 4, it can be seen that the noise when the power is turned on is reduced by 5 to 10 dB as a result of using the shock absorbing material.

In the above embodiment, the case where the shock absorbing material is provided on the fixed iron core has been described, but the same result as the above characteristic is obtained when the shock absorbing material is provided on the movable iron core.

The present invention is not limited to an electromagnetic switch, an electromagnetic contactor, and an electromagnetic relay composed of a fixed iron core and a movable iron core, and any controller that causes a void when the fixed iron core and the movable iron core are attracted and attracted. It can be applied to iron cores.

[0014]

[Effect of device]

 As described above, according to the controller core of the present invention, the collision between the fixed core and the movable core during operation can be softened, the wear of the cores can be reduced, the noise due to the collision can be reduced, and the core wear can be reduced. By reducing the amount, the reliability of the device is improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a controller core according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view in which the shock absorbing material is separated along the line − of FIG. 1 and seen from the direction of the arrow.

FIG. 3 is a comparison diagram of wear amount with and without impact cushioning material.

[Fig. 4] Comparison diagram of noise characteristics with and without impact cushioning material

[Fig. 5] Relationship between iron powder amount and number of failures

[Explanation of symbols]

10 is a movable iron core, 11 is a fixed iron core, 12 is an electromagnetic coil,
Reference numeral 13 indicates a shock absorbing material.

Claims (2)

[Scope of utility model registration request] 1. A controller core comprising a movable iron core and a fixed iron core, each of which is formed by laminating silicon steel sheets, and a flexible shock absorbing material is provided in a void portion generated when the fixed iron core and the movable iron core are attracted to each other. A controller iron core characterized by being provided. 2. The controller iron core according to claim 1, wherein a shock absorbing material having flexibility is fitted into a fixed iron core or a movable iron core.