JP2000082374A - Electromagnet device for electromagnetic contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic contactor which can reduce the arc energy flowing in switching contacts and can decrease wear of the contacts. SOLUTION: An electromagnet device of an electromagnetic contactor comprises a put-on coil, a hold coil, and a first 17a and a second stationary core 17b on which the two coils are wound, wherein the put-on coil portions 3a and 3b and the hold coil portions 4a and 4b are wound on the peripheries of the first 17a and second cores 17b in such a way that ones are located inside and the others outside, respectively, and the put-on coil portions 3a and 3b are connected parallel with each other while the hold coil portions 4a and 4b are also connected parallel with each other. Thereby the current flowing through the put-on coil portions 3a and 3b can be reduced, which decreases the whole electromagnetic energy to lead to having of the arc current flowing through switching contacts 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnet apparatus which is attached to an electromagnetic contactor and generates a driving force and a holding force when a main circuit is turned on using an electromagnetic force.

[0002]

2. Description of the Related Art A conventional electromagnetic device of an electromagnetic contactor is shown in FIG.
6 to FIG. In the figure,
Reference numeral 10 denotes an electromagnetic contactor, 11 denotes a frame made of an insulating material such as a synthetic resin or the like.
2 are integrally formed. Further, a fixed electrode and a movable electrode (not shown) are accommodated in the container 12. A drive shaft 13 is attached to the frame 11 so as to be rotatable. The drive shaft 13 is configured to move the movable electrode toward and away from the fixed electrode. Reference numerals 14 and 15 are lead terminals. Reference numeral 16 denotes an electromagnet device for operation, which includes first and second fixed iron cores 17a and 17a attached to the frame 11.
7b, a closing coil 18 wound around the outer periphery of the first fixed iron core 17a, and a holding coil 19 wound around the outer periphery of the second fixed iron core 17b. Reference numeral 20 denotes a movable iron core, which is attached to the drive shaft 13. A return spring 21 is provided for the first fixed iron core 17a and the second fixed iron core 17a.
b. The electromagnet device 16 has a circuit as shown in FIG. That is, the switching contact 22 is connected in series with the closing coil 18, and the holding coil 19 is connected in parallel with the connected circuit. Less than,
The operation of the electromagnetic contactor having such a configuration will be described. FIG. 4 shows a state where the electromagnetic contactor is open. In this state, when the closing coil 18 and the holding coil 19 are energized, the fixed iron cores 17a, 17b
Then, the movable iron core 20 is sucked. When the movable iron core 20 is sucked, the drive shaft 13 rotates integrally with the movable iron core 20 to bring the movable electrode in the container 12 into contact with the fixed electrode to close the electric circuit, and the switching contact 22 is opened. Then, the current to the closing coil 18 is turned off. As a result, a current flows only in the holding coil 19, and the movable core 20 is held in a state of being attracted to the second fixed core 17b.

[0003]

However, since the closing coil 18 of the conventional electromagnet device of the electromagnetic contactor is an inductive load, the switching contact 2 is disconnected when the closing coil 18 is disconnected.
An arc occurs between the two contacts. At the time of arc generation, assuming that the current flowing through the closing coil 18 is I and the inductance of the closing coil 18 is L, the attractive force φ is φ =
LI, and the arc energy E generated between the contacts at that time is E = 1 / 2LI ² . For this reason, in the conventional electromagnetic contactor, there is a problem that the switching contact 22 is consumed or transferred, and the life of the switching contact 22 is shortened. Therefore, an object of the present invention is to provide an electromagnetic contactor capable of reducing arc energy flowing through a switching contact and reducing consumption of the switching contact.

[0004]

SUMMARY OF THE INVENTION To solve the above problems, the present invention provides an electromagnetic contactor having a closing coil, a holding coil, and first and second fixed iron cores on which these coils are wound. In the electromagnet device, one of the input coil and the holding coil is wound around the outer periphery of both the first fixed iron core and the second fixed iron core, and the other is set outside. In this embodiment, the holding coils are connected in parallel with each other. By doing so, the current flowing through each closing coil can be reduced, the entire electromagnetic energy can be reduced, and the arc current flowing through the switching contact can be halved.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of an electromagnetic contactor showing an embodiment of the present invention, a part of which is shown in cross section. FIG. 2 is a front view of the electromagnet device, and FIG. 3 is a circuit diagram of the electromagnet device. 4 to 6 indicate the same or corresponding members. In the drawing, reference numeral 1 denotes an electromagnetic contactor, 2 denotes an electromagnet device attached to the electromagnet device 1, and each of a first fixed iron core 17a and a second fixed iron core 17b has an outer periphery provided with input coils 3a, 3b and a holding coil. Both coils 4a and 4b are wound. FIG.
a and 3b are wound inside, and the holding coils 4a and 4b are wound outside. The closing coils 3a, 3
b and the holding coils 4a and 4b use an electric wire having a cross-sectional area that is half the cross-sectional area of the conventional input coil and holding coil, and have the same number of turns as the conventional input coil and holding coil. I am wearing it. Next, the operation of the electromagnetic contactor thus configured will be described. FIG.
Indicates that the electromagnetic contactor is open (main circuit is open). When the power is turned on from this state, current flows to the making coils 3a, 3b and the holding coils 4a, 4b, and attracts the movable core 20 to the first and second fixed cores 17a, 17b against the return spring 21. Close the magnetic contactor (close the main circuit). When the movable core 20 is attracted, the switching contact 22 is opened. When the switching contact 22 is opened, current does not flow to the closing coils 3a, 3b, current flows only to the holding coils 4a, 4b, and the movable core 29 is attracted to the first and second fixed cores 17a, 17b. Hold. When the switching contact 22 is opened, the self-inductance of the closing coils 3a and 3b is the same as the self-inductance of the conventional closing coil, and the resistance is doubled. In the present invention, since the closing coils 3a and 3b are connected in parallel, the attractive force P at that time is as follows: P = 1 / 2LI + 1 / 2LI, where L is the self-inductance. You will have power. When the arc energy is E, E = 1 /
2L × (I / 2) ² + ／ L × (I / 2) ² = 1/4
The LI ^2. Therefore, the electromagnet device in the electromagnetic contactor of the present invention has the same attractive force as the conventional one, and the switching contact 2
Since the arc current flowing through 2 can be halved, wear of the switching contact is reduced. In the case of the above embodiment,
A closing coil 3a connected in parallel for 100 volt operation,
3b and the holding coils 4a and 4b can also be turned into a holding coil and a holding coil for 200 volt operation by being connected in series, so that all the electromagnetic contactors can be handled by one kind of making coil and holding coil. Further, by dividing the holding coil into two, the efficiency of heat dissipation can be improved and the temperature rise of the electromagnet device can be suppressed.

[0006]

As described above, the present invention has the following effects. (1) The arc current flowing through the switching contact can be halved, and the consumption of the switching contact is reduced. (2) The input coil and holding coil connected in parallel for 100 volt operation also become the input coil and holding coil for 200 volt operation by connecting in series. This can be handled with a holding coil. (3) By dividing the holding coil into two, the efficiency of heat dissipation is improved and the temperature rise of the electromagnet device can be suppressed.

[Brief description of the drawings]

FIG. 1 is a side view of an electromagnetic contactor showing an embodiment of the present invention, and a part is shown in a cross section.

FIG. 2 is a front view of an electromagnet device showing an embodiment of the present invention.

FIG. 3 is a circuit diagram of an electromagnet device showing an embodiment of the present invention.

FIG. 4 is a side view of a conventional electromagnetic contactor, a part of which is shown in cross section.

FIG. 5 is a front view of a conventional electromagnet device.

FIG. 6 is a circuit diagram of a conventional electromagnet device.

[Explanation of symbols]

 Reference Signs List 1 electromagnetic contactor, 2 electromagnetic device, 3a, 3b input coil, 4a, 4b holding coil, 11 frame, 12 container, 13 drive shaft, 14, 15 extraction terminal, 20 movable iron core, 21 return spring, 22 switching contact

Claims (1)

[Claims] 1. An electromagnet apparatus for an electromagnetic contactor having a closing coil, a holding coil, and first and second fixed cores for winding these coils, wherein the first fixed core and the second fixed core are provided. On either side of the iron core, either the closing coil or the holding coil inside,
An electromagnet apparatus for an electromagnetic contactor, wherein the other end is wound outside, and the respective input coils and the respective holding coils are connected in parallel.