JPS6022305A - Ac electromagnet iron core apparatus - Google Patents

Abstract

PURPOSE:To stabilize the abutting state of an iron core by providing a relief stepped part to prevent a pole contact surface from coming into contact in a non-shading part and also a step to release polishing heat in the inner edge of the pole contact surface. 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, a heat-releasing step of almost the same height as an external step is provided in the inner edge of a pole contact surface 38 of the fixed iron core 14. And further, a relief step DELTAh to prevent the pole contact surface 38a in the non- shading part of the movable iron core 20 from contacting the pole contact surface 38 of the fixed iron core 14 is provided. The heat-releasing step releases heat generated in the pole contact surface from its internal and external sides during polishing process. The internal and external sides of the pole contact surface 38 are of the same height and concave. The relief step difference DELTAh minimizes heat generated during processig and residing in th pole contact surface 38b in the shading part 46, thus lessening the formation of a recess during polishing process.

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 a 1L magnetic switch for controlling the 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. It is.

Opening/closing control of electric circuits after electric power is normally performed by an electromagnetic standoff device such as an electromagnetic contactor or an electromagnetic relay.

FIG. 1 shows an exploded perspective view of a conventional electromagnetic IHI switch, and FIG. holds an identification core 14 to which an operating coil 12 is attached.

A main body frame 16 is screwed to the receiving stand 1o, and a cross bar 18 is provided within the main body frame 16 so as to be slidable relative to the main body frame 16. This cross spar 18 is provided with an elastic plate 22 extending +=J moving iron core 2 degrees so as to face the fixed iron core 14 . And, between this cross par 18 and the receiving stand 10, there is a spring 2.
4 is interposed between them, and the cross spar 18 is normally pushed up by the upward force of this biasing spring 24, whereby the movable core 20 is pushed upward against the fixed core 14 through the gap. be done.

Therefore, by applying an excitation voltage to the operating coil 12 or cutting it off, the movable core 20 approaches and separates from the fixed core 14, and the black metal 18 slides up and down, thereby opening and closing the t-way of the electric motor, etc. will be exposed.

That is, a fixed contact 28 provided with an identification contact 26 is fixed to the main body frame 16, and a movable contact 32 is connected to the black metal 18 via a contact valve 30. A movable contact 34 facing the fixed contact 26 is provided at the tip of the oj movable contact 32.

Therefore, the sliding action of the cross spar 18 causes the movable contact 34 to approach and separate from the fixed contact 26, thereby achieving one-way control of the t-path.

In this pole device, the magnet core, for example, the fixed core, is usually provided with a retaining groove on the armature surface of the determined core in order to prevent the core attraction force from decreasing when the movable core is in contact with the identified core. The Kumatori coil 35 is installed in the holding groove, and the movable iron core is stably maintained in an adsorbed and held state on the fixed iron core.

That is, in the attraction Bj of the fixed core, when the distance between the inner cores is large, the inductance of the operating coil is small, so a large rush current flows through the operating coil, and its attraction force becomes large. When the suction of the movable core is completed and the gap is closed, the inductance of the operating coil increases, and the % bit flowing through the operating coil decreases. At this time, a difference is generated between the magnetic flux of the magnetic part due to the magnetic flux and the magnetic flux of the non-magnetic magnetic part due to the 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.

Incidentally, an arc is generated before the fixed and movable contacts connect and separate, and in order to prevent the harmful effects of the arc heat and the arc from spouting outward, an arc cut-3 is formed on the main body frame 16.
6 is detachably provided.

However, in this type of device, the fixed core 14
There has been a drawback in that beats occur between the inner core due to the unstable contact between the inner core and the movable core 20. That is, the identification/movable inner core 14.20 is formed of a laminate in which a plurality of laminates made of silicon steel plates are laminated, and the armature surface of this laminate is usually polished to smooth it. be exposed.

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 the other pieces Qr and becomes concave.

Generally, the armature surface of the fixed core 14 is
As shown in the figure, there is a small step inside the armature surface 38,
However, it is common that there is a large step on the outside, and when the armature surface 38 with such a shape is ground, the machining heat is removed from the outside of the armature surface with a large step. Although the heat is effectively dissipated, the heat dissipation effect from the inside of the armature surface, which has a small step, is not sufficient, and as a result, thermal expansion is larger on the inside of the armature surface than on the outside, and the amount of expansion is As a result of the fact that the inner side is ground more in response to the difference, the inner side of the armature surface 38 contracts more than the outside (III) when it is cooled to room temperature after machining, as shown in Fig. 4. , the polar surface had a low inclination towards the inside.

Therefore, the inner core 14.20 that does not disturb such a smooth direction
If it comes into contact with , the state of contact with ′ becomes unstable,
In addition, there was a drawback in that beats were generated between the inner cores 14 and 20 because the armature of the armature part was not securely brought into contact with the mating armature surface.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to stabilize the contact state of the inner movable core and to improve the contact between the armature surface of the Kumatori part and the mating surface of the mating armature. To provide an AC electromagnet iron core device that can ensure contact and fully exhibit the Kumatori effect.

In order to achieve the above object, the present invention has a fixed 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 identified iron core. In an AC electromagnet iron core device in which a retaining groove is provided on the armature surface of the holder, and a Kumatori coil is fixedly held in this retaining groove, the armature surface of the non-conforming matrices or the other party facing the non-conforming matrices armature surface. A step surface is formed on at least one side of the side contact surface to avoid contact between the non-recessed mating part contact surface and the mating part contact surface, and the other contact surface of the mating part contact contact. It is characterized in that a heat dissipation step is provided at the inner end of the mating armature surface to radiate the polishing heat of the armature surface.

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

A first embodiment of an AC electromagnet core ah according to the present invention is shown in FIGS. 5 to 7, and the same members as in the conventional device are given the same reference numerals and their explanations will be omitted.

In the present invention, what is inside the machine is the fixed/movable side iron core 14.
．． The shape of the armature surface of 20 is formed into a unique shape, and the inner core 1
4.200 The structure is such that the contact state is stabilized and the Kumatori effect is fully exhibited.

In the first embodiment, as shown in FIG. 5, an outer step is provided on the inside of the armature surface 38 in order to prevent the armature surface 38 from tilting due to polishing of the fixed core 14. A heat radiation Vfjr difference 42 of approximately the same quotient is formed.

Therefore, when polishing the armature surface 38, the processing heat is effectively dissipated from both the outer and inner sections of the armature surface 38, and the center portion of the armature surface 38 is slightly moved. It is formed into a concave surface.

On the other hand, the armature surface 38 of the movable iron core 20 is
A step Δh is formed in the first relief, in which the armature surface 38a of the armature portion 46 is slightly lower than the armature surface 38b of the armature portion 46. Therefore, the amount of heat absorbed by the armature surface 38b can be reduced, and thereby, It is possible to reduce the depth of the recess formed in the armature surface 38b, and the fixed/movable side iron core 14.2
00 Stable contact can be achieved.

Also, the contact surface 38 of the non-aligned matrix portion 44 of the movable iron core 20 is
A is avoided from coming into contact with the armature surface 38 of the fixed core 14, and as a result, as shown in FIG. The contact is reliably performed, and thereby the kumatori effect of the kumatori part 44 can be fully exhibited.

8 and 9 show a second embodiment of the AC electromagnet iron core device according to the present invention, and the same parts as the conventional device and the first embodiment have the same reference numerals and explanations thereof. omitted.

The difference between the device of the second embodiment and the device of the first embodiment is as follows.
A step 48 is provided on the armature surface of the fixed iron core 14 to provide a second relief for avoiding contact with the warped matrix portion 44.

As described above, when the armature surface of the movable iron core 20 is polished, the armature surface of the mating part 46 warps due to the heat of processing, as shown in FIG. Therefore, when the movable core 20 and the fixed core 14 are in contact, the contact &1138 of the fixed core 14 and the armature surface of the non-aligned mating portion 44 of the movable core 20 Only 38a is in contact with the contact surface 38b of the bear part 46.
are not in fixed contact, and therefore the suction force between the inner cores is weak.
lx, a beat will occur between the inner iron cores.

In order to prevent such a problem, in the second embodiment, a second relief step 48 is formed at the position of the contact surface of the fixed iron core 20, which is opposed to the contact surface 38a of the deformed matrix portion 44. be done. Therefore, when the inner core 14.20 is in the abutting state, the armature surface 38b of the warp matrix portion 44 of the movable core 20
The contact between the armature surface 38 of the fixed iron core 14 is avoided, and only the armature surface 38b of the armature portion 46 of the movable iron core 20 comes into contact with the armature surface 38 of the fixed iron core 14.
The abutting state of the inner cores 14 and 20 is stabilized, and the suction force between the inner cores is strengthened, so that the beat phenomenon between the inner cores can be reliably prevented.

As explained above, according to the present invention, there is a small number of the armature surface of the movable iron core or the other armature surface facing the armature section of the movable iron core. A recessed step surface is formed to avoid contact between the mating part armature and the other party's armature surface, and the inner side J, l'i of the other party's arming surface that comes into contact with the mating part's armature surface is formed. , As a result of providing a heat radiation insulation gap in the first part to radiate the polishing heat of the armature surface, the contact state between the movable core and the fixed core is stabilized, and the contact suction force of the inner core is increased. This makes it possible to reliably eliminate beats that occur between the inner cores.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view showing the schematic configuration of the electromagnetic switch, Figure 2
The figure is a schematic configuration diagram of an AC electromagnet core device, Figure 3 is an explanatory diagram showing the shape of the armature surface of the movable iron core formed due to polishing of the armature surface, and Figure 4 is the polishing process of the armature surface. An explanatory diagram showing the inclined state of the fixed core armature surface formed due to heat, FIG. 5 is an explanatory diagram showing the shape of the fixed core armature surface of the device according to the first embodiment of the present invention, and FIG. 6 is an explanatory diagram showing the tilted state of the fixed core armature surface formed due to heat. An explanatory diagram showing the movable core armature m (shape) of the device according to the first embodiment, FIG. 7 is an explanatory diagram showing the contact state of the fixed and movable inner cores of the device according to the first embodiment of the present invention, and FIG. Figure 9 is an explanatory diagram showing the shape of the fixed core armature surface of the device according to the second embodiment. 10 is the operating coil with the same number.
14 is a fixed iron core, 20 is a movable iron core, 36 is a magnetic coil, 38 is a polarizing surface, 38a is a non-porous polarizing electrode, 38
b is the contact surface of the kumatori part, 42 is the heat dissipation insulation, 44 is the non-contact matori part, 46 is the kumatori part, 48 is the second relief step, Δh
is the first relief step. Agent: Patent Attorney Masuo Oiwa (2 others) Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] (1) A fixed core equipped with an operation coil and a movable core that faces the fixed core and abuts against the fixed core due to the suction action of the fixed core are fixed, and a retaining groove is provided on the armature surface of one of the cores. In an AC electromagnetic iron core device in which a magnetic coil is fixedly held in this holding groove, at least one of the non-recessed matrices armature surface or the other party's armature surface that is opposite to the non-symmetrical matrices armature surface. A relief step surface is formed on the side to avoid contact between the mating part armature surface and the other party's armature surface, and the part of the mating part's armature surface that the mating part armature contacts ( 1111 The end of the electromagnetic iron core device is characterized by a heat dissipation step that dissipates the polishing heat of the armature surface.