KR20170008579A - Coil assembly for relay - Google Patents

Abstract

The present invention provides a coil assembly for a relay, capable of reducing line resistance while maintaining the number of turns in a coil and ultimately increasing the strength of a magnetic field. The coil assembly for a relay according to the present invention comprises a bobbin; a first coil wound on the bobbin in a plurality of turns and having a first wire diameter; and a second coil having a second wire diameter smaller than the first wire diameter and wound on the bobbin in a plurality of turns.

Description

{COIL ASSEMBLY FOR RELAY}

The present invention relates to a relay, and more particularly, to a coil assembly of a relay capable of increasing the strength of a magnetic field and reducing operating voltage and operating current in a relay.

An example of the configuration of the relay related to the present invention can be found in the following Patent Document 1.

(Patent Document 1) KR10-1422394 B1

The present invention relates to a coil assembly for providing a magnetic driving force to a movable core in a relay, and a prior art structure of such a coil assembly will be described with reference to Fig.

1, the coil assembly is configured to include a bobbin 10 and a coil 20 wound around the bobbin 10.

As the magnetic driving force exerted by the coil assembly, magnitude of the magnetic force and intensity of the magnetic field are generated as shown in the following Equation (1).

B? NI ------ (1)

In the above equation (1), B is the intensity of the magnetic field, n is the number of turns of the coil (number of turns) per unit length of the coil assembly, and I is the amount of current flowing through the coil.

That is, as can be seen from the above equation (1), the intensity of the magnetic driving force (intensity of the magnetic field) exerted by the coil assembly is proportional to the number of turns of the coil per unit length and the amount of current flowing therethrough.

If the amount of current is constant, the intensity of the magnetic field is proportional to the number of turns of the coil per unit length, that is, the number of turns.

In the coil assembly according to the related art as shown in FIG. 1, the coil 20 having a small diameter and a small diameter is tightly wound around the bobbin 10 in order to increase the strength of the magnetic field.

However, according to the conventional coil assembly, since the coil diameter of the coil 20 is small, the resistance of the coil is increased and the amount of current flowing through the coil 20 is reduced. Therefore, the magnitude of the magnetic driving force exerted by the coil assembly, The strength of the magnetic field is weakened.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a coil assembly of a relay capable of reducing the line resistance while increasing the number of turns of the coil and ultimately increasing the strength of the magnetic field will be.

It is an object of the present invention to provide a coil assembly for a relay,

Bobbin;

A first coil wound around the bobbin in a plurality of turns, the first coil having a first wire diameter; And

And a second coil having a second diameter smaller than the first diameter and wound on the bobbin in a plurality of turns.

According to a preferred aspect of the present invention, the second coil is wound around the bobbin so as to fill a gap between the first coils wound in pluralities.

A coil assembly of a relay according to the present invention includes a first coil wound around a plurality of windings and having a first wire diameter, a second coil having a second wire diameter smaller than the first wire diameter, 2 coils, it is possible to reduce the line resistance while not reducing the number of windings, thereby providing an effect of enhancing the size of the magnetic field.

Since the coil assembly of the relay according to the present invention is configured to wind the second coil so as to fill the gap between the first coils, it is possible to maintain the size of the wound coil so as to enhance the size of the magnetic field without increasing the size of the coil assembly Effect can be provided.

1 is a schematic diagram showing a configuration of a coil assembly of a relay according to the prior art,
2 is a schematic block diagram showing the configuration of a coil assembly of a relay according to a preferred embodiment of the present invention.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

2, which is a schematic structural view showing a configuration of a coil assembly of a relay according to a preferred embodiment of the present invention.

A coil assembly of a relay according to a preferred embodiment of the present invention is configured to include a bobbin 10, a first coil 21, and a second coil 22.

The bobbin 10 provides support means for the coils that can wind (wind) the first coil 21 and the second coil 22 along the perimeter.

Although not shown, the bobbin 10 has a cylindrical or quadrangular-pyramid-shaped body portion having a hollow structure with an inside being hollow and made of a material having electrical insulation property, and a bobbin 10 formed at both ends in the longitudinal direction of the body portion, And may include a flange portion for preventing separation.

A stationary core (not shown) of a relay fixedly provided in the hollow interior of the bobbin 10; and a second position opposite to the stationary core in a first position approaching the stationary core, A movable core of the relay movable to the second position may be provided.

The first coil 21 is wound on the bobbin 10 by a plurality of windings and has a first wire diameter. Here, the first line diameter is larger than the line diameter of the coil 20 according to the conventional technique shown in Fig.

With respect to the first coil 21 and the second coil 22,

Indicates the direction in which current flows, and symbol

Indicates the direction in which the current flows.

Since the current flows in a circumferential shape around the bobbin 10 by the first coil 21 and the second coil 22, the magnetic field formed in the direction perpendicular to the current direction by the current flows in the longitudinal direction of the bobbin 10 As shown in FIG.

The second coil 22 has a second wire diameter smaller than the first wire diameter, which is the wire diameter of the first coil 21, and is wound on the bobbin 10 by a plurality of turns.

2, the second coil 22 is wound on the bobbin 10 so as to fill the gap between the first coils 21 that are wound a plurality of times.

Thus, by winding the second coil to fill the gap between the first coils, the size of the wound coil can be kept unchanged compared to the prior art, so that the magnitude of the magnetic field can be increased without increasing the size of the coil assembly.

The operation of the coil assembly of the relay according to the preferred embodiment of the present invention configured as described above will be described.

When electric current is supplied to the conductor terminal in a state where the electric conductor terminals are connected to the first coil 21 and the second coil 22 by using a connection method such as soldering, the first coil 21 and the second coil 22, And a magnetic field formed in a direction perpendicular to the current direction by the current flows through the inside of the bobbin 10 along the longitudinal direction thereof.

The formed magnetic field magnetizes a not-shown fixed core fixed inside the bobbin 10, and the magnetized fixed core sucks the opposed movable core to move the movable core to approach the fixed core.

This movement of the movable core acts to separate the movable contact connected to the movable core from the corresponding fixed contact, so that the power supply circuit between the power supply side and the load side is opened and the power supply can be cut off.

On the other hand, when the current is stopped flowing to the conductor terminal, current does not flow through the first coil 21 and the second coil 22, so that no magnetic field is formed and the fixed core is demagnetized.

Thus, as the suction force of the fixed core is extinguished, a return spring, not shown, applies an elastic force to return the movable core to a position away from the fixed core, so that the movable core moves to a position away from the fixed core.

This movement of the movable core acts to bring the movable contact connected to the movable core into contact with the corresponding fixed contact, so that the power supply circuit between the power source side and the load side is closed and power supply can be performed from the power source to the load side.

Since the coil assembly of the relay according to the present invention includes the first coil 21 having the first wire diameter larger than that of the prior art coil and the second coil 22 having the wire diameter smaller than the first wire diameter, And the number of windings may not be reduced so that the effect of enhancing the magnitude of the magnetic field can be provided. Therefore, the strength of the magnetic field applied to the fixed core can be enhanced as compared with the prior art, so that the operation reliability of the relay can be improved.

Since the coil assembly of the relay according to the present invention is configured to wind the second coil 22 so as to fill the gap between the first coils 21, it is possible to maintain the size of the wound coil so as not to increase the size of the coil assembly, Can be increased.

10: Bobbin 20: Coil
21: first coil 22: second coil

Claims (2)

In a coil assembly of a relay,
Bobbin;
A first coil wound around the bobbin in a plurality of turns, the first coil having a first wire diameter; And
And a second coil having a second wire diameter smaller than the first wire diameter and wound on the bobbin in a plurality of turns. The method according to claim 1,
And the second coil is wound between the first coils.

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