JPS62145707A - Electromagnet device - Google Patents

Abstract

PURPOSE:To form a non-magnetic layer uniformly to a predetermined thickness and obtain a long-life electromagnet device with improved abrasion resistance and impact resistance by a method wherein a spacer plate is contacted and fixed to the pole contact surface of one of fixed core and a movable core by laser welding and the welded positions are shifted from the pole contact parts between the cores. CONSTITUTION:A spacer plate 5 is put on the movable core side surface of a fixed core 1 and welded by laser welding at a plurality of positions and attached to the fixed core 1. The welded positions 6 are provided on the fixed core 1 and shifted from the parts 7 which are contacted with a movable core 3 when the movable core 3 is attracted by the fixed core 1. Thus, as the welded positions 6 do not exist in the pole contact parts 7 between the movable core 3 and the fixed core 1, influence of the heat accompanying the laser welding is not given to the pole contact parts 7 and the flatness of the pole contact part 7 can be maintained by uniformly formed thin film non-magnetic layer 5a of the spacer plate 5 with a high accuracy. Therefore, adherence between the spacer plate 5 and the fixed core 1 and the adherence between the movable core 3 and the spacer plate 5 can be improved so that excellent characteristics of an electromagnet can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electromagnetic device used for example in an electromagnetic contactor, in particular, which is excited by a current obtained by rectifying direct current or alternating current, and is used to connect a movable core to a fixed core. The present invention relates to an electromagnetic device that moves toward and away from the vehicle.

[Conventional technology]

Electromagnets used in electromagnetic contactors, etc. usually have an operating coil (not shown) wrapped around a fixed iron core (1), as shown in Figure 2.
By applying current to this coil, the movable iron core (3
) are attracted to the fixed iron core (1), and are separated by de-energization. In this case, if DC current is applied to the operation coil to cause the fixed core (1) to attract the movable core (3), residual magnetism will be generated in the core even if the current is removed, causing the fixed core (1) and the movable core to be attracted to each other. (3) may not be separated.

Therefore, in the past, hard chrome plating was applied to the contact surface of the movable core (3) or the fixed core (1) to form a non-magnetic layer, or as shown in Figure 2, the contact surface of the movable core (3) or the movable core (
It has been proposed to braze a spacer (4) made of a non-magnetic material such as stainless steel to the contact surface of 3) to prevent attraction due to residual magnetism of both cores (Utility Model Application No. 58-464).
No. 12).

([Problem to be solved by the invention]) When the contact surface of the movable core (3) or the fixed core (1) is coated with sandy chromium plating to form a nonmagnetic layer, the nonmagnetic coating is uniformly formed. In addition to being difficult to form a film with a predetermined thickness, the magnetic properties become unstable, and there are also problems in terms of wear resistance and impact resistance.

In addition, when brazing non-magnetic materials such as stainless steel, the heating time during brazing becomes long and the non-magnetic material deforms, resulting in poor flatness of the contact surface, which may cause buzzing during operation or non-magnetic materials. There was a problem in that the magnetic material was damaged by impact.

This invention was made to solve these problems, and provides an electromagnetic device with a long life by forming a non-magnetic layer uniformly with a predetermined thickness and improving wear resistance and impact resistance. The purpose is to

[Means for Solving the Problems] The electromagnet device according to the present invention has a spacer plate formed by press-bonding a thin film non-magnetic layer on one or both sides of a magnetic substrate, so that either the fixed core or the movable core can be connected to one side. It is characterized by being closely fixed to the pole surface by laser welding, and the welding position is shifted from the armature of the iron core.

[Effect]

In the electromagnet device according to the present invention, the spacer plate is directly and tightly placed on the surface of the fixed iron core or the movable iron core by laser beam welding, and the welding position is shifted between the armatures of both iron cores. Improves electromagnetic properties by ensuring flatness. In addition, since the welding position is protected from impact caused by the movement of the movable iron core, the adhesion strength between the spacer plate and the iron core is not affected, and the spacer plate for preventing residual magnetism is prevented from peeling off from the iron core. To prevent.

〔Example〕

FIG. 1 is a front view showing an embodiment of the present invention. In the figure, (1) is a fixed iron core, (2) is a fixed iron core (1,)
(3) is the movable core.

(5) is a thin non-magnetic layer (5a) made of, for example, austenitic stainless steel with a thickness of about 0.1 mm and a magnetic substrate (5b) made of 5841 steel with a thickness of about 0.5 mm. It is a spacer plate formed by plywood, and the spacer plate (5) is generally made by stacking metal plates about 10 times the size of the metal plates of the thin non-magnetic layer (5a) and the magnetic substrate (5b), heating them, and hot rolling. It is made with a thin non-magnetic layer (5
A) is formed uniformly while maintaining non-magnetism, and the bonding surfaces of the two are metallurgically bonded.

This spacer plate (5) is superimposed on the surface of the fixed core (1) on the movable core side, and is attached by laser welding at a plurality of locations. This welding position (6) is on the fixed core (1) shifted from the armature portion (7) when the movable core (3) is attracted to the fixed core (1).

In this way, since there is no welding position (6) on the armature (7) between the movable core (3) and the fixed core (1), the heat effect due to laser welding is not applied to the armature (7). The flatness of the armature portion (7) can be ensured with high precision by the uniformly formed thin film nonmagnetic layer (5a) of the spacer plate (5).

Therefore, the degree of adhesion between the spacer plate (5) and the fixed iron core (1) and the degree of adhesion between the movable iron core (3) and the spacer plate (5) are improved, and good electromagnetic characteristics can be obtained.

In the electromagnet device configured as described above, the movable core (3) moves toward and away from the fixed core (1) by energizing or de-energizing the operation coil (2), but the spacer plate (5) Since the flatness of the contact electrode portion (7) is maintained with high precision, a reliable suction operation can be performed.

In this suction operation, the welding position (
6) is shifted from the armature (7), so the welding position (6)
) is not directly struck by the movable iron core (3)K (
, can be avoided from shock during suction operation. Therefore, separation of the spacer plate (5) does not occur, and the residual magnetism prevention effect can be maintained over a long period of time.

In addition, the thin film nonmagnetic layers (5a) and (5) of the spacer plate (5)
The purpose of c) is to prevent the movable core (3) from adhering when the current is turned off, and if this thickness is too thick, the movable core (
Since the adsorption of 3) will not be performed reliably, the appropriate thickness is approximately 0.1 mm, and a metal plate of this thickness alone will not ensure impact resistance during suction, but the spacer plate (
Since the thickness of the metal plate of the magnetic substrate (5b) in 5) can be increased to an arbitrary value, sufficient impact resistance can be ensured.

In addition, in the above embodiment, a spacer plate (5) is attached to the fixed core (1).
Although the spacer plate (5) is fixed to the movable iron core (3), the same functions and effects as in the above embodiment can be obtained.

〔Effect of the invention〕

As explained above, in this invention, a spacer plate formed by press-bonding a thin non-magnetic layer to a magnetic substrate is attached to the surface of a fixed iron core or a movable iron core by laser welding, and the welding point is offset from the armature. Therefore, the flatness of the armature can be maintained with high precision, and the attracting and separating operations of the electromagnet can be performed stably.

In addition, since the welding area is not directly struck by the iron core, the impact resistance of the welding area is improved, the spacer plate is prevented from peeling off, and the electromagnet can operate stably over a long period of time.

Furthermore, the magnetic substrate ensures shock resistance as an electromagnet, and at the same time, the thin non-magnetic layer has the effect of preventing the movable core from being attracted by residual magnetism when the current is turned off.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the electromagnet device of the present invention, and FIG. 2 is a perspective view showing a conventional example. In the figure, (1) is a fixed core, (2) is an operating coil,
(3) is a movable iron core, (5) is a spacer plate, (5a),
(5c) is a thin film nonmagnetic layer, (5b) is a magnetic substrate, (6)
is the welding position. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent: Patent Attorney Masatoshi Sato-C'Jr')lr)O3■T

Claims (1)

[Claims] A fixed iron core, an operating coil that excites the fixed iron core,
In an electromagnet device comprising a movable core that is attracted to the fixed core excited by the operation coil, and a spacer plate attached to the armature surface of the fixed core or the movable core to prevent residual magnetism, A spacer plate formed by press-bonding a thin non-magnetic layer on one or both sides of the substrate is closely fixed to the armature surface of the fixed core or movable core by laser welding, and the welding position is set to the armature of the core. An electromagnetic device characterized by being shifted from the center.