JPS6022306A - Ac electromagnet iron core apparatus - Google Patents

Abstract

PURPOSE:To stabilize an abutting state by providing a relief stepped part to prevent a pole contact surface in a non-shading part from contacting a pole contact surface on an opposite side at the outer edge of a pole contact surface at least on either of a fixed iron core and a movable iron core. CONSTITUTION:In an AC magnet iron core apparatus consisting of a fixed iron core 14 fitted with an operating coil and a movable iron core 20 with a shading coil 35, the fixed iron core 14 having a small step h1 formed in the internal side of a pole contact surface 38 and a large step h2 in the external side, is provided. After cooling, the pole contact surface 38 tilts low inwardly because of signification thermal expansion in the pole contact surface caused by the insufficient release of heat generated during polishing. In order to make sure that a pole contact surface 38b in the shading part of the movable iron core 20 comes in contact securely with the pole contact surface 38 of the fixed iron core 14, a step difference DELTAh is formed in such a manner that the pole cntact surface of an external non-shading part 40a may be slightly lower than the pole contact surface of a shading part 42.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an AC electromagnet core device, and more particularly to an AC electromagnet core device that is used in an electromagnetic switch that controls opening and closing of an electric circuit of a motor, and provides driving force for opening and closing contacts that open and close the electric circuit. .

Opening control of electric circuits such as electric motors is usually performed using an electromagnetic switch such as an electromagnetic contactor or an electromagnetic relay.

FIG. 1 shows an exploded perspective view of a conventional electromagnetic switch.
Furthermore, Fig. 2 shows an AC electromagnet iron core device used in an electromagnetic switch.
A fixed iron core 14 is held. and,
A main body frame 16 is screwed to the mounting base 10, and a cross spar 18 is provided within the main body frame 16 so as to be slidable relative to the main body frame 16. A movable iron core 20 is attached to this cross spar 18 by an elastic plate 22 so as to face the fixed iron core 14 . A biasing spring 24 is interposed between the cross spar 18 and the loading platform 10, and the cross spar 18 is normally pushed up by the upward biasing force of the spring 7 spring 24, thereby making it movable. The iron core 20 is placed above the fixed iron core 14 with a gap in between.

Therefore, by applying or cutting off the FJ)JKM ML pressure to the operating coil 12, the movable core 20 approaches and separates from the fixed core 14, and the crossbar 18 slides up and down, thereby opening and closing the electric circuit of the electric motor, etc. That will happen.

That is, a fixed contact 28 provided with a fixed contact 26 is fixed to the main body frame 16, while a movable contact 32 is connected to the cross spar 18 via a contact valve spring 3o.
is slidably provided, and a movable contact 34 facing the fixed contact 26 is provided at the tip of this movable contact 32 .

Therefore, the movable contact 34 is brought into contact with and separated from the fixed contact 26 by the sliding action of the chrome plate 18, thereby achieving control of opening and closing of the electric circuit.

In this type of device, the electromagnetic core, for example, the fixed core, is usually provided with a retaining groove on the armature surface of the fixed core to prevent a decrease in core attraction force when the movable core is in contact with the fixed core. The Kumatori coil 35 is attached to the groove, and the movable iron core is stably maintained in an adsorbed and held state on the fixed iron core.

That is, when the fixed core is attracted, when the distance between the inner cores is large, the inductance of the operating coil is small, and therefore a large rush current flows through the operating coil, resulting in a large attraction force. When the suction of the movable core is completed and the gap is closed, the inductance of the operating coil increases, and the current flowing through the operating coil decreases. At this time, a phase difference occurs between the magnetic flux of the magnetic flux generated by the magnetic flux coil and the magnetic flux of the non-magnetic magnetic flux, so that the attractive force of the electromagnet does not become zero, and the movable iron core is maintained in an attracted and held state.

An arc is generated when both the fixed and movable contacts connect and separate, and an arc cover 36 is provided on the main body frame 16 to prevent harmful effects caused by the arc heat and to prevent the arc from spouting outward.
is removably provided.

However, in this type of device, the fixed core 14
There was a drawback that a beat was generated between the inner core due to unstable contact between the inner core 14 and the movable core 20. In other words, both the identification and moving cores 14 and 20 were made of a plurality of silicon steel plates. It is formed of a laminate made of laminated plates, and the contact surface 38 of the laminate is usually polished to smooth it.

This polishing process is carried out without using a coolant in order to prevent the adverse effects of coolant oil entering the boundaries of each laminate. As a result, the central part of the armature surface, where machining heat stays, expands more than the other parts, and this expanded part is polished smooth, so that when cooled to room temperature after machining, as shown in Figure 3. , the central part of the armature surface contracts more than other parts and becomes concave.

Generally, the armature surface of the identification core 14 is provided with the
As shown in the figure, there is a small step on the inner side 911j of the armature surface 38, but a large step on the outside. In this case, the process heat is effectively dissipated from the outside of the armature surface with a large step, but the heat dissipation from the inside of the armature surface with a small step is not sufficient. Thermal expansion is larger on the inside of the surface than on the outside, and as a result of the difference in the amount of expansion, the inside is ground more, and as a result, the outside of the armature surface 38 is The inner side contracted more than the other, and as shown in FIG. 4, the armature surface became a lower inclined surface toward the inside.

Therefore, the inner core 14.20 which does not have such a smooth surface
If the two contact each other, the state of contact between the inner core 14 and the inner core 14 and 20 will become unstable, and the armature surface of the mating part will not be in reliable contact with the other armature surface, causing a beat between the inner core 14 and 20. There was a drawback to that.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to stabilize the contact state of both the fixed and driven iron cores, and to improve the contact between the contact surface of the mating part and the contact surface of the other side. An object of the present invention is to provide an AC electromagnet iron core device that can ensure contact between the two and sufficiently exhibit the Kumatori effect.

In order to achieve the above object, the present invention has an identified iron core equipped with an operating coil, and a movable iron core that faces the fixed iron core and comes into contact with the fixed iron core by the suction action of the fixed iron core, one of which is a 111i iron core. In an AC electromagnet iron core device in which a retaining groove is provided on the armature surface of the inner core and a Kumatori coil is fixedly held in this retaining groove, at least one of the outer ends of the armature surface of the inner core is provided with a retaining groove. This is a sign that a relief step is formed to avoid contact of the non-contact matrices with the mating contact surface.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

5 and 6 show a schematic configuration of an AC electromagnet iron core device according to the present invention, and the same members as those in the conventional device are denoted by the same reference numerals and explanations thereof will be omitted.

The characteristic feature of the present invention is that the fixed/movable side iron core 1
The shape of the armature surface of 4.2o is formed into a unique shape to stabilize the state of contact with the inner core 14.200 and to create a 14th structure that fully exhibits the Kumatori effect.

In this embodiment, as shown in FIG.
0) A clearance step Δh is formed in which the height of the armature port of the IJ section 40a is slightly lower than the height of the armature surface of the closed section 42, and in this embodiment, it is several tens of microns lower. .

Therefore, in the present embodiment, as shown in FIG. 6, even if the armature surface 38 of the fixed iron core 14 is sloped low toward the inside, as described above, The contact surface 38a of the outer valve mating part is formed with a relief step Δh.
Therefore, contact between the outer valve matrix contact surface 38a and the armature surface 38 of the fixed iron core 14 is avoided. As a result, the armature surface 38bIJ'' of the armature section 42 is brought into precise contact with the fixed core armature 38, and the armature effect of the armature coil 35 is fully exhibited, so that both cores 4.
By strengthening the suction force in the contact state of 20, it is possible to effectively eliminate 1q'F of the beat phenomenon between the two pivot points.

In addition, in this embodiment, the relief step of the armature surface of the iron core was provided on the movable core side, or the relief step was provided on the armature surface of the fixed core facing the warped mater portion on the outside of the movable core. It is also possible to provide the same effect as in this embodiment.

As explained above, according to the present invention, at least one of the armature surfaces of the fixed and movable side iron cores has a non-aligned matrices on the outer end of the armature surface, and the mating portion of the armature is connected to the other armature surface. As a result of the formation of the relief step that avoids contact, the state of contact between the movable core and the fixed core is stabilized, and the contact suction force of the inner core is increased, thereby preventing the occurrence between the two rotation centers. It becomes possible to reliably remove the beat.

[Brief explanation of the drawing]

Figure 1 is a diagonal diagram showing the schematic configuration of the ML magnetic switch, Figure 2 is a dilapidated diagram of the AC electromagnet iron core device M, and Figure 3 is a dilapidated diagram of the AC electromagnet core device M.
The figure is an explanatory diagram showing the shape of the armature surface of the movable core formed due to the grinding of the armature surface, and Figure 4 is an explanatory diagram showing the shape of the armature surface of the movable core formed due to the grinding process of the armature surface. An explanatory diagram showing the inclined state of the pole surface, Fig. 5 0, a diagram showing relief steps formed on the movable core of the device of the present invention, and Fig. 6 are diagrams showing the fixed and movable side cores of the device of the present invention. It is an action explanatory diagram showing a state. The same month in each figure is given the same reference numeral, 12 is the operating coil, 14 is the identification core, 20 is the movable core, 38.38a, 3
8b is the b h4 surface, 40 is the non-recessed matri section, 40a is the outer valve matori section, and Δh is the relief step. Agent: Patent Attorney Masuo Oiwa (2 others) Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (1) It has a fixed core on which an operating coil is attached, and a movable core that faces the fixed core and comes into contact with the fixed core due to the suction action of the fixed core, and one of the cores has a retaining groove on the armature surface. In an AC electromagnet iron core device in which a mater coil is fixedly held in this retaining groove, at least one outer end of the armature surface of the inner core is provided with a non-aligned mater part armature. An AC electromagnet iron core device characterized in that a relief step is formed to avoid contact with a mating armature surface.