JPS5828129A - Operation coil assembly for electromagnetic contactor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operating coil assembly for a magnetic contactor operated by an alternating current input.

As is well known, electromagnetic contactors are widely used to open and close each circuit, and include a fixed contact connected to the main circuit, a movable contact that opens and closes the main circuit, and a contact that is fixed to the case and operated. A fixed core that generates an attractive force with an operating coil that is excited by an input, a movable core that is attracted to the fixed core and is provided so that it can move forward and backward with respect to it and is biased in the retracting direction, and is further connected to a movable contact and the movable core. crossed bar
When the movable core is attracted to the fixed core by an operation input, the movable contact is driven by the crossbar and the main circuit is closed, and when the operation input is removed, the fixed core is retracted and the main circuit is opened. .

Traditionally, electric am contactors operated by alternating current input have generally had a fixed iron core equipped with a shaded coil.
This device will be explained below with reference to the drawings.

In FIG. 1, a fixed core 10 is fixed to a base (not shown), an operating coil 12 is externally fitted and fixed to the central core, and shade removal coils 14 are attached to the left and right cores. The movable core 16 to which the crossbar is connected is provided so as to be movable on the base in the vertical direction relative to the fixed core in the figure, and is always urged upward in the figure by a biasing means (not shown).

The connections of the apparatus shown in FIG. 1 are shown in FIG. 2, and the voltage vectors thereof are shown in FIG. 3. In FIG. 2, a switch 19 and an AC power source 20 are connected to the operating coil 12. In addition, in FIG. 3, ■ is the voltage of the AC power supply 20, R
1 is the internal resistance of the operating coil 12, ω is the 200 angular frequency of the AC power supply, L(t) is the inductance of the operating coil 12,
1(t) indicates the current flowing through the operating coil 12.

When the switch 19 is closed, the operating coil 1z is excited, the movable iron core 16 is attracted to the fixed iron core 10, the movable contact is driven, and the main circuit is closed.

When the movable iron core 16 is attracted, both iron cores 10°16
When the gap between
Therefore, a large rush current flows through the operating coil 12, and its attractive force becomes large. Then, when the suction of the movable iron core 16 is completed and the gap is closed, the inductance L(t) becomes steeper, and the current 1(t) flowing through the operating coil 12 becomes smaller. At this time, due to the shade coil 14, a phase position is created between the shaded part magnetic flux Φ and the non-shaded part magnetic flux Φ shown in FIG. Iron core 1
6 is maintained.

In the conventional device described above, a large rush current flows through the operation coil 12 when the movable core 16 is attracted, so it is possible to generate a larger attraction force than a device operated by a direct current operation input, and therefore, in a short period of time. The main circuit can be immediately closed by completing suction of the movable core 16 in a time of 4+.

However, the above-mentioned conventional device has problems such as a large input shock, a short lifespan, and a negative effect on other parts and mechanisms.Also, the movable iron core is not attracted by AC operation input. Since it is held, the pulsation of its suction force cannot be avoided, which has the drawback of making a lot of noise. Furthermore, since the magnetic flux passing through both cores 10 and 16 alternates, various iron losses and copper losses occur when the movable core is attracted, but these losses are so large that they cannot be ignored. Further, in order to reduce the hysteresis loss which accounts for a large portion of the above losses, the iron core 10.16 is formed by laminating silicon steel plates, but in the case of silicon steel plates, the problem arises that the device becomes expensive.

In addition, advanced technology is required for manufacturing and installing the darkening coil.

Furthermore, in the conventional device, the operating wheel is fixed to the coil holding frame in the base, and therefore,
When the operating coil needs to be removed due to a change in the operating input voltage or for maintenance and inspection, the work of removing the coil or installing it is extremely cumbersome.

The present invention has been made in view of the above-mentioned conventional problems,
The purpose of this is to operate the electromagnetic contactor so that the operation coil can be easily replaced and inspected, reduce the impact of turning on, reduce core noise, and reduce power consumption when the movable core is attracted and held. An object of the present invention is to provide a coil assembly.

In order to achieve the above object, the present invention provides an operating coil case in which an operating coil is fixed and a fixed iron core is removably inserted through the operating coil, and an operating coil case that is fixed to the operating coil case and is opened after the main circuit is turned on. It has a switch, a rectifier circuit that rectifies the AC operation input and supplies excitation current to the operation coil, and a capacitor for dividing the excitation 1iB voltage of the operation coil, and is connected in series to the rectifier circuit, and the operation is completed. Inside the operating coil case, a circuit is built in that includes a voltage divider circuit in which switches are connected in parallel, and supplies a large excitation current to the excitation coil when the main circuit is turned on, and a small excitation current to the excitation coil via the voltage divider circuit after the main circuit is turned on. a printed circuit board fixed to the fixed iron core, the fixed core is formed in a substantially U-shape, the printed circuit board is formed in a substantially U-shape, and the opening thereof is arranged in the insertion path of the fixed core leg, and the fixed core is formed in a substantially U-shape. It is characterized in that leakage magnetic flux between the inner cores is prevented from interlinking.

Hereinafter, a preferred embodiment of the present invention will be explained based on the drawings.

FIG. 4 and FIG. 5 respectively show a front cross section and a side cross section of the electromagnetic contactor in which the operating coil assembly according to the present invention is housed. In the figure, a base 3o of the electromagnetic contactor main body is screwed onto a mounting plate 32, and a terminal 34 to which the main circuit is connected is fixed to the base 30.
A fixed contact 36 having a fixed contact 38 is fixed in electrical continuity with the terminal 34 . The mJJ contact 4o, which closes or releases the main circuit by contacting or not contacting the fixed contact 38, is provided on the movable contact 42.

The oJ movable contact 42 is held by the cross par 44 so that the movable contact 4o is in a position opposite to the fixed contact 38, and is driven by the cross par 44 in the vertical direction in the figure.

The cross spar 44 is provided slidably in the vertical direction in the figure along the inner wall of the base 3o, is always urged upward, and is pulled downward when the device is inserted. That is, cross par 4
The lower end of the crossbar 44 is constantly urged upward by a tripping bolt 54 provided on the upper surface of the rail 52.
15 is applied to the movable core 16 attracted by the fixed core 10.
They are connected by 8. Incidentally, a cushioning rubber 6° is inserted between the movable iron core 16 and the cross spar 44 for the purpose of reducing the injection impact.

With the above configuration, when the movable iron core 16 is not pulled down by the movable iron core 16, fc Fi, the crossbar 44 is pushed upward by the spring 54, and the movable contact 4o retreats upward from the fixed contact 38. In this state,
Therefore, the main circuit is opened at this time. Further, when the movable iron core 16 is pulled down in the figure against the spring 54, the movable contact 4o comes into contact with the fixed contact 38, and the main circuit is closed.

As described above, the pulling down of the six moving iron cores 16 is performed by the fixed iron core ]O, and the attraction force of the fixed iron core 10 is performed by exciting the operating coil 12 by an operation input.

In this embodiment, the operating coil 12 is excited by the circuit shown in FIG.

That is, in the figure, the operation input is rectified by the rectifier circuit 22 and supplied to the operation coil 12.

In addition, a voltage dividing capacitor 24 is connected to the input side of the rectifier circuit 22.
is connected in series to the rectifier circuit 22, and the capacitor 2 is connected in series to the rectifier circuit 22.
A closing completion switch 18 is connected in parallel to 4.

The closing completion switch 18ij is closed when the main circuit is turned on, and therefore, at this time, a large excitation current is supplied to the operating coil 12 via the rectifier circuit 22. Further, the closing completion switch 18 is opened after the main circuit is turned on, and therefore, at this time, the voltage dividing capacitor 24 functions as a voltage dividing circuit, and a small excitation current is supplied to the operating coil 12 via the capacitor 24 and the rectifier circuit 22. Ru.

In addition, in this device, the fixed iron core 10 and the operating coil 12
etc. are housed in an operating coil case 66 that is separate from the electromagnetic contactor main body to form an operating coil assembly 68, while the electromagnetic contactor main body has an opening 7 below the movable iron core 16.
0 is formed, and the operating coil assembly 68 is inserted into the electromagnetic contactor main body through the opening 70.

Next, the structure of the operating coil assembly 68 and the electromagnetic contactor body for housing the same will be explained in detail.

FIG. 7 is an exploded perspective view of these components, and in this figure, the base 30 is formed with an opening 70 for housing the assembly 68.

At the bottom of this base 30 is the aforementioned rail plate 52 or the screw 7.
2) to facilitate storage of the assembly 68. That is, two parallel U-shaped rails 74 and 76 are formed on the rail plate 52, and the assembly 68 is guided by the rails 74 and 76. 68 positioning is performed. Furthermore, an engagement hole 82 is formed in the front part of the shield plate 52, and a ratchet 84 is provided in the front part of the case 66, so that when the assembly 68 is stored, the two are engaged and the assembly 68 is secured. It is fixed to the base 30. At this time, the adsorption surfaces of the movable iron core 16 and the fixed iron core 10 are set at positions facing each other with a predetermined gap.

The fixed iron core 10 is formed in a U-shape, and a bin 8 is provided below it.
A hole into which a shock absorber 6.88 is inserted is formed, and a groove for mounting a buffer spring 90 is formed on the lower surface of the hole after the lower MU. This buffer spring of 9° can reduce the impact on the mounting board surface when the wIlj11 contactor is inserted. In addition, fixed iron core i.

Buffer rubbers 92,94 are inserted into the holes 98 of the guides 96 which are made of a material with low frictional resistance and are inserted into the recesses of the rails 76 mentioned above. is inserted.

Fixed core part 101 of 1° with each member attached as described above! L and 10b are fitted into core holes 66a and 66b formed in the case 66. Note that the upper part of the operation coil case 66 is covered with a cover 100VC).

The aforementioned operational input is applied to the terminal 102 and then to the printed circuit board 104 fixed to the case 66. The rectifier circuit 22 and capacitor 24 shown in FIG. 6 described above are arranged on this printed circuit board 104, and in the actual device,
A current limiting resistor is provided in series with the capacitor 24, etc.
Other circuit components are also placed.

Further, the above-mentioned closing completion switch 18 is not arranged on this printed circuit board 104 but is fixed to the case 66.

FIG. 8 is a partially folded perspective view of this closing completion switch 18, in which a switch base 110 has a switch fixed contact 112.
, fit the switch return spring 114 into the convex part of the base 110, insert the switch movable contact 11g into the push rod 116 biased by the spring 114, and the upper part
The closing completion switch 18 is constructed by fitting the lower protrusion of the pusher 116 into the spring 114, and then fitting the switch cover 120 thereon.

FIG. 9 explains the wiring of each member in the above operating coil assembly 68.
6, each connection is made.

Further, in this embodiment, the circuit components arranged on the printed circuit board 104 are fixed with a cast molding material so that they will not be damaged by the impact of opening and closing the iron cores 10 and 160. Therefore, the walls 130a and 1
30b is formed, a case 66 is made into a container, the operating coil 12 and the printed circuit board 104 are housed in the case 66, and then the case 66 is filled with a cast molding material.

The case 66 of the operating coil 12 and the printed circuit board 104
The mold fixing work inside the mold can be easily carried out because the case 66 is made into a container.

Note that the fixed iron core 10, switch 18, electric wires, etc. are not fixed with a mold.

Here, as shown in FIG. 7, the printed circuit board 104 is U-shaped, and the opening thereof is U-shaped, and the printed circuit board 104 is inserted into the case 66 so as to be placed between both legs of the nine fixed cores 100. It is arranged. This can prevent an accident in which leakage magnetic flux leaking between both legs of the fixed iron core 100 interlinks with the electric circuit of the printed circuit board 104 and melts the circuit.

A preferred embodiment of the present invention has the above configuration, and its operation will be explained below.

When no operating input is applied to the input terminal 102 of the operating coil assembly 68, the movable core 1'6 is not attracted, so the cross spar 44 is in an upwardly pulled state and the main circuit is open.

When the main circuit is turned on by applying an operation input to the input terminal 102, the closing completion switch 18 is attracted by a closing force.

When the adsorption of the movable iron core i6 to the fixed iron core 10 is completed, that is, after the main circuit is turned on, the closing completion switch 18 is fully suppressed and opened on the lower surface of the movable iron core 16, and a small excitation current is applied to the operating coil 12. The magnet is supplied via the capacitor 24 and the rectifier circuit 22, and the movable iron core 16 is maintained in the attracted state by this excitation ttlt.

Also, when replacing or inspecting the operating coil 12,
Remove the ratchet 84 and remove the operating coil assembly 68.
i Pull it out from the contactor body.

As described above, according to this embodiment, the operation coil assembly can be attached and detached freely, so that the operation coil replacement and inspection work can be facilitated.

Further, according to the present invention, when the main circuit is turned on, a large excitation voltage t& determined by the internal resistance of the operating coil flows to the operating coil, and when the main circuit is subsequently held, the excitation voltage t& is determined by the internal resistance of the operating coil and the voltage dividing capacitor. Since a small excitation current flows through the operating coil, a smooth main circuit closing operation is ensured, and power consumption during preservation is extremely low.

The voltage dividing capacitor should be set at a value that is sufficiently far away from the cap where the capacitor resonates with the operating coil.

Furthermore, according to the present invention, it is possible to reduce the impact when the main circuit is turned on.

According to the present invention, since the excitation coil is excited by the rectified excitation current, no iron core noise is generated, hysteresis loss, etc. do not occur, and no bear coil is required.

Further, when the main circuit is opened, an arc occurs between the fixed contact and the movable contact, but according to the present invention, this arc is completely absorbed by the voltage dividing capacitor, so both contacts are consumed by this arc VC. There is no problem, and no noise is emitted to the outside.

According to Kinoe f3JJ, the printed circuit board incorporating the rectifier circuit and voltage divider circuit is firmly attached to the operating coil case, and the operating coil, input terminals, etc. are connected to this, so the wiring space for these can be reduced. can.

According to the embodiment, the operating coil and the circuit components incorporated in the printed circuit board are fixed by molding.
These will not be damaged by the impact of opening and closing the iron core, and
Since these are not exposed to the outside air, they do not deteriorate over time.

In particular, according to the present invention, leakage magnetic flux generated between the legs of the fixed core does not link with the electric circuit of the printed circuit board, so that
This magnetic flux prevents the electric circuit from melting down, thereby increasing the reliability of the device.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of the conventional device, Fig. 2 is a circuit diagram of the operating section of the device shown in Fig. 1, Fig. 3 is a vector diagram of Fig. 2, and Fig. 4 shows the coil assembly according to the present invention installed. Figure 5 is a front sectional view of the electromagnetic contactor that has been installed.
The figure is a circuit diagram of the operating coil assembly according to the present invention, FIG. 7 is an explanatory diagram for assembling the operating coil assembly, FIG. 8 is an explanatory diagram for assembling the closing switch, and FIG. 9 is an explanatory diagram for wiring the operating coil assembly. , is. Identical parts in each figure are given the same reference numerals, IO is the solid/animal core, 12 is the operation coil, 18 is the closing completion switch, 22 is the rectifier circuit, 24 is the capacitor, 66 is the operation coil case,
68 is an operating coil assembly, 104 is a printed circuit board, 13
0, 130b is a wall. Agent Patent Attorney Shin Kuzuno (and others) Figure 1 1y ■ Figure 2 Figure 3 Figure 5 Figure 6 Figure 8 Figure 9

Claims (1)

[Claims] (1) An operating coil case in which an operating filter is fixed and a fixed iron core is removably inserted through the operating coil, a closing completion switch that is fixed to the operating coil case and opens after the main circuit is switched on, and an AC A rectifier circuit that rectifies the operation input and supplies excitation current to the operation coil, and a voltage divider circuit that has a capacitor for dividing the excitation voltage of the operation coil, is connected in series to the rectifier circuit, and is connected in parallel with a closing completion switch. A printed circuit board fixed inside the operation coil case is incorporated with a circuit that supplies a large excitation current to the excitation coil when the main circuit is turned on, and a small excitation current to the excitation coil when the main circuit is turned on. , the fixed core is formed in a substantially U-shape, and the printed circuit board is formed in a substantially U-shape, and the opening thereof is placed between both legs of the fixed core, so that leakage magnetic flux between the legs of both cores is chained to the printed circuit board. An operating coil assembly for an electromagnetic contactor, characterized in that the coil assembly does not cross each other.