JPS62145706A - Electromagnet device - Google Patents

Abstract

PURPOSE:To form a non-magnetic layer uniformly to a predetermined thickness and improve the abrasion resistance and impact resistance of an electromagnet device by a method wherein the thin film non-magnetic layer side of a spacer plate is so provided as to be contacted with the pole contact surface of one of a fixed core and a movable core. CONSTITUTION:The magnetic substrate 5b of a spacer plate 5 is brought to the upper side which is contacted with a movable core 3 and the thin film non-magnetic layer 5a is so provided as to be contacted with the surface of a fixed core 1 and attached to the movable core side surface of the fixed core 1 by a method such as soldering or laser welding. In accordance with the repeated times of impacts given by the movable core 3 at the time of attraction, abrasion is created on the surface of the spacer plate 5. However, since the very thin film non-magnetic layer 5a, which serves as residual magnetism preventing function, is protected by the relatively thick magnetic substrate 5b which maintains the impact resistance, the thin film non-magnetic layer 5a can remain on the fixed core 1 as a non-magnetic film for a long period.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is applicable to, for example, an electromagnetic device used in an electromagnetic contactor, particularly in direct current or alternating current. The present invention relates to an electromagnetic device that is excited by a rectified current and drives a movable core toward and away from a fixed core.

[Conventional technology]

Electromagnets used in military book 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
) is attracted to the fixed iron core (1) K, and separated by de-energization. In this case, if the operating coil is fully supplied with DC current and the movable core (3) is fully attracted to the fixed core (1), residual magnetism will be generated within the core even if the current is completely removed. ) and the oJ moving iron core (3) may not be separated from each other.

Therefore, in the past, the movable core (1) or fc was coated with hard chromium plating on the contact surface of the fixed core (3) to form a non-magnetic layer, or as shown in Figure 2, the movable core (1) or the movable core It has been proposed to completely braze the spacer (4) made of a non-magnetic material such as stainless steel to the contact surface of (3) to completely prevent attraction due to residual magnetism of the inner core (Utility Model Application No. 58-46).
No. 412).

[Problem that the invention seeks to solve]

When the contact surface of the movable core (1) or the fixed core (3) is plated with hard chromium to form the entire nonmagnetic layer, it is difficult to uniformly form the nonmagnetic broken film, and it is difficult to form the nonmagnetic layer uniformly. It is not possible to form a thick film, the magnetic properties become unstable, and there are also problems in terms of wear resistance and impact resistance.

In addition, when brazing stainless steel h or other non-magnetic materials, the heating time during brazing becomes long and the non-magnetic material becomes deformed (2. The flatness of the contact port becomes poor, and burrs occur during [IItI production]). There was a problem that the non-magnetic material could be damaged due to side friction.

In order to resolve the problems with this invention, f'L
It is a non-magnetic nozzle with a predetermined thickness and a uniform shape of 1i.
It is intended for all purposes to be an electromagnet which has Z L, wear resistance, and impact resistance.

[Means for solving problems]

(5) Magnet-tck according to this invention is a spacer plate? It is formed from a plywood material in which a thin non-magnetic layer is bonded at full pressure to a magnetic substrate, and this thin non-magnetic layer 1! The fixed core is arranged in a dense layer on the surface of every 4t to 10,000 armature of the fixed core or the moving core.

[For 1] In the electromagnet device according to the present invention, when the spacer plate is attached to the surface of the armature surface of the fixed core or the moving core, the thin nonmagnetic layer is arranged so as to be in close contact with the surface of the core.
r, so the thin non-magnetic layer is protected from wear due to collision with the iron core.
Protected by a thicker magnetic substrate 1, the anti-remanence ability is maintained over a long period of time (number of impacts).

[Embodiments of the invention]

FIG. 1 is a front view showing an embodiment of the electromagnet device of the present invention. In the figure, (1) is a fixed core, (2) is an operating coil attached to the fixed core (1), and (3) is a It is a movable iron core. (5) is made of, for example, austenitic stainless steel, and has a thin non-magnetic layer (5
a) and, for example, 5841. with a thickness of about 0.5 nrm. ! !
It is a spacer plate formed by pressure-bonding the magnetic substrate (5b)' from 1 to 1. Generally, the thickness of the spacer plate (5) is about 10 times that of the metal plate of the thin non-magnetic layer (5a) and the magnetic substrate (5b). The thin non-magnetic layer (5a) is formed uniformly and completely retains its non-magnetic properties, and the joint surfaces of the two are metallurgically bonded. I'm here.

On this spacer plate (5), the magnetic substrate r5b)k is placed on the upper side in contact with the movable iron core (3), and the thin film nonmagnetic layer r5a)k is placed in close contact with the surface of the fixed iron core (1),
It is attached to the surface of the fixed core (1) on the movable core side by brazing, laser welding, or the like.

In the l/″L ft magnet device configured as described above, when the operating coil (2) is energized with a DC operating current from the i section, the fixed iron core (1) is excited and is movable by the generated magnetic force. The iron core (3) is attracted and touches the fixed iron core (1) through the spacer plate (5) □ This 1 and 4
The impact caused by the movable iron core (3) causes wear on the surface of the spacer plate (5) depending on the number of times the movable iron core (3) is turned. However, the very thin non-magnetic layer (5a) that acts as a residual magnetism preventive layer is combined with a thick magnetic substrate (5b) to ensure impact resistance, so the fixed iron core (5a) can be used for a long period of time. 1) remains as a non-magnetic film.

Furthermore, even if the surface of the spacer plate (5) is worn out due to the impact during adsorption, the thickness of the magnetic substrate (5b) only decreases.
Since this does not occur due to wear of the thin non-magnetic layer (5a), changes in magnetic properties can be reduced even if all the repetition operations are performed.

Next, when the operating coil (2) switches from the energized state to the de-energized state, excitation by the operating coil (2) no longer occurs, but the movable core (3) continues to be attracted to the fixed core (1) due to residual magnetism. try However, the thin nonmagnetic layer (5a) of the spacer plate (5) blocks the residual magnetic flux and prevents the movable core (3) from being attracted.

In the above embodiment, the case where the spacer plate (5) is fixed to the fixed core (1) has been explained, but even if the spacer plate (5) is completely fixed to the movable core (3), the same effect as in the above embodiment is obtained.・It can be effective.

〔Effect of the invention〕

As explained above, in this invention, the spacer plate attached to the armature surface of the fixed core or movable core to prevent residual magnetism is arranged in close contact with the entire core surface on the thin, pseudo-nonmagnetic layer side. Even if the spacer plate is worn out due to the opening/closing operation of the movable core, its residual magnetism prevention function is not impaired and the opening/closing operation can be performed smoothly.

Furthermore, since the spacer plate is used as a magnetic substrate on the impact surface of the moving core and fixed core, it is possible to ensure full impact resistance as an electromagnet and at the same time stabilize the magnetic properties. It also has

[Brief explanation of drawings]

FIG. 1 is a first-order diagram showing an embodiment of the present invention, and FIG. 2 is an 8+ diagram showing a conventional electromagnet layout. (1)...Fixed iron core, (2)...Operation coil, (3
)...Movable iron core, (5)...Spacer plate, (5a)
. . . Thin draft nonmagnetic layer, (5b) . . . Magnetic substrate. In addition, are the same symbols in each figure the same or corresponding parts? show.

Claims (1)

[Claims] A fixed iron core, an operating coil that excites the fixed iron core,
A movable core that is attracted to the fixed core excited by the operating coil, and a non-magnetic spacer plate that is attached to the armature surface of either the fixed core or the movable core to prevent residual magnetism. In an electromagnetic device,
The spacer plate is formed of a plywood material in which a thin non-magnetic layer is press-bonded to a magnetic substrate, and the thin non-magnetic layer side is placed in close contact with the surface of the armature surface of either the fixed core or the movable core. An electromagnetic device featuring: