The present invention relates to an electromagnetic device, particularly an electromagnetic device incorporated into an electromagnetic relay by winding a coil twice, and an electromagnetic relay using this electromagnetic device.
As an electromagnetic device with a double-wound coil, for example, a bobbin complete body 111 has been used which is formed by winding a coil 112 in two layers around a bobbin 113, as illustrated in FIG. 8 of Patent Document 1. In
Patent Document 1: Japanese Unexamined Patent Publication No. H3-254035
However, the coil 112 is wound in two layers on the bobbin 113, so that the bobbin complete body 111 becomes bulky and the device cannot be made more compact in size.
In the bobbin complete body 111, it is necessary to wind extended wires 112a, 112a′ of the coil 112 around external connection terminals 114a, 114a′. Similarly, it is necessary to wind extended wires 112b, 112b′ of the coil 112 around external connection terminals 114b, 114b′. For this reason, with the bobbin complete body 111, it takes time and effort to do connection work on the coil 112 and the productivity is thus low.
One or more embodiments of the present invention provides an electromagnetic device compact in size and with high productivity and an electromagnetic relay using the electromagnetic device.
An electromagnetic device according to one or more embodiments of the present invention is provided with: a spool having a cylindrical body with a through hole; a secondary coil formed in a spiral shape along an outer peripheral surface of the cylindrical body and formed with a closed circuit by metal plating; and a primary coil formed of a conductive wire wound around the secondary coil via an insulating material covering the secondary coil. An induced current, generated by applying a voltage to any one of the primary coil and the secondary coil, is allowed to flow to the other coil different from the one coil.
According to one or more embodiments of the present invention, with the secondary coil formed by metal plating, an electromagnetic device more compact in size and smaller in bulk than that of the conventional example can be obtained. Further, according to the above aspect of the present invention, there is no need to bind the extended wire of the coil to the coil terminal as in the conventional example, thus facilitating the connection work, so that an electromagnetic device with high productivity can be obtained.
Embodiments the present invention will become apparent from the following description in conjunction with embodiments with reference to the accompanying drawings. In the drawings,
Before continuing with the description of the present invention, the same reference numerals are provided to the same parts in the accompanying drawings.
In describing embodiments of the present invention and in describing configurations represented in the drawings, terms indicating directions such as “up”, “down”, “left”, and “right”, and other terms including those, will be used. The purpose for using those terms is to facilitate understanding of the embodiments through the drawings. Accordingly, those terms do not necessarily indicate directions used at the time of actually using the embodiments of the present invention. A technical scope recited in the claims shall not be restrictively interpreted by using those terms.
A description will be given of a case where an electromagnetic device according to the embodiment of the present invention is incorporated into an electromagnetic relay according to the accompanying drawings of
As illustrated in
As illustrated in
In the placement space 12, terminal holes (not illustrated) for press-fitting coil terminals 27, 27 of the electromagnetic device 20 are provided at adjacent corner portions on the front side of the placement space 12 in
As illustrated in
As illustrated in
As illustrated in
In the embodiment, as illustrated in
Further, as illustrated in
Note that a light emitting element 33 and a resistor 34 are connected in series to the lead wire 26d formed in the guard portion 24 (
In the embodiment, the light emitting element 33 and the resistor 34 are directly connected to the lead wire 26d of the guard portion 24. There is thus an advantage that the number of parts and assembling steps in the assembling process are small, the productivity is high, and the electromagnetic device 20 which is space-saving can be obtained.
Further, as illustrated in
In the embodiment, ribs 28, 28 capable of press-fitting connection terminals (not illustrated) are formed on the guard portion 24 of the spool 21. This is because the spool 21 is used for assembling other electromagnetic relays.
The yoke 32 is a magnetic material having an L-shaped cross section, and as illustrated in
As illustrated in
As illustrated in
As illustrated in
The casing 70 has a box shape that can be fitted to the base 11, and an engagement hole 71 is provided in the lower side edge of each of the facing side surfaces. The ceiling surface of the casing 70 is provided with an operation check window 72 through which the light emitting element 33 can be checked visually. An example of the operation check window 72 is a transparent window. That is, the operation check window 72 is disposed to face the notch 42, and is configured so as to guide the light, emitted by the light emitting element 33, to the outside through the notch 42 and the operation check window 72.
Next, the operation of the electromagnetic relay 10 will be described.
First, when no voltage is applied to the primary coil 30 of the electromagnetic device 20, as illustrated in
When a voltage is applied to the primary coil 30 for excitation, the magnetic line of force passing through the iron core 31 attracts the horizontal portion 41 of the movable iron piece 40 to the magnetic pole portion 31b of the iron core 31. Then, against the spring force of the movable touch piece 52, the movable iron piece 40 rotates around the support portion 32a of the yoke 32, and the lower end 43 of the movable iron piece 40 presses the card 60. Therefore, the operating protrusion 61 of the card 60 presses the movable touch piece 52, and the movable touch piece 52 rotates. As a result, the movable contact 52a is separated from the normally closed fixed contact 51a, and thereafter comes into contact with the normally open fixed contact 53a. Then, the horizontal portion 41 of the movable iron piece 40 is attracted to the magnetic pole portion 31b of the iron core 31.
When a voltage is applied to the primary coil 30, an induced current flows through the secondary coil 26 by electromagnetic induction, and the light emitting element 33 is lit via the lead wire 26d and the like. The light of the light emitting element 33 is then transmitted through the notch 42 of the movable iron piece 40 provided above the light emitting element 33 and the operation check window 72, and whether or not the light emitting element 33 is lit can be checked from the operation check window 72 of the casing 70. Hence in the embodiment, the light emitting element 33 continues to emit light while a voltage is applied to the primary coil 30, so that whether or not the electromagnetic relay 10 is in operation can be determined from the outside of the electromagnetic relay 10.
Note that at least a part of the casing 70 may have the operation check window 72 which is translucent or transparent so that the light of the light emitting element 33 can be visually checked from the outside.
Subsequently, when the application of the voltage to the primary coil 30 is stopped, the magnetic line of force passing through the iron core 31 disappears, and the movable touch piece 52 pushes back the movable iron piece 40 via the card 60. Thus, after being separated from the normally open fixed contact 53a, the movable contact 52a comes into contact with the normally closed fixed contact 51a and returns to its original position. Then, the induced current flowing through the secondary coil 26 disappears, and the light emitting element 33 is turned off. This enables visual checking that the electromagnetic relay 10 has stopped operating.
According to the embodiment, with the secondary coil 26 formed by metal plating, it is possible to obtain the electromagnetic device 20 more compact in size and smaller in bulk than that of the conventional example. Further, according to the embodiment, there is no need to bind the extended wire of the coil to the coil terminal as in the conventional example, thus facilitating the connection work, so that the electromagnetic device 20 with high productivity can be obtained.
In the embodiment, the light emitting element 33 is directly attached to the guard portion 24 of the spool 21. Therefore, it is unnecessary to attach the light emitting element 33 to the guard portion 24 of the spool 21 via the connection terminal. Furthermore, there is no need to electrically connect the light emitting element 33 to the connection terminal via a lead wire. This eliminates the need to do assembling work and soldering work on the connection terminal, and the electromagnetic device with high productivity can be obtained with small numbers of parts and assembling steps.
Further, the secondary coil 26 is formed in advance on the cylindrical body 22 of the spool 21 by metal plating, for example, the MID molding method, thus eliminating the need to do winding work on the secondary coil 26, so that the productivity is further improved.
Moreover, the light emitting element 33 is lit by an induced current flowing through the secondary coil 26. This eliminates the need to obtain the power, which is necessary for lighting the light emitting element 33, from an external power supply. As a result, it is unnecessary to connect the light emitting element 33 to the external power supply, and an electromagnetic device 20 having a simple structure can be obtained.
Although the secondary coil 26 of the electromagnetic device 20 according to the embodiment is provided with the stepped auxiliary pattern 26b in a part of the secondary coil 26, a smoothly continuous spiral secondary coil may be formed.
Further, the communication holes 22a, 24a of the spool 21 may be formed in a mortar shape in order to facilitate laser irradiation performed in the MID molding method.
A variety of embodiments of the present invention have been described in detail with reference to the drawings, and lastly, a variety of aspects of the present invention will be described.
A electromagnetic device according to one or more embodiments of the present invention includes: a spool having a cylindrical body with a through hole; a secondary coil formed in a spiral shape along an outer peripheral surface of the cylindrical body and formed with a closed circuit by metal plating; and a primary coil formed of a conductive wire wound around the secondary coil via an insulating material covering the secondary coil. An induced current, generated by applying a voltage to any one of the primary coil and the secondary coil, is allowed to flow to the other coil different from the one coil.
According to the first aspect of the present invention, with the secondary coil formed by metal plating, an electromagnetic device more compact in size and smaller in bulk than that of the conventional example can be obtained. Further, according to the first aspect of the present invention, there is no need to bind the extended wire of the coil to the coil terminal as in the conventional example, thus facilitating the connection work, so that an electromagnetic device with high productivity can be obtained.
According to a second aspect of the present invention, in the first aspect, the guard portion may be provided at at least one end of the cylindrical body, and both ends of the secondary coil, formed on an outer peripheral surface of the cylindrical body, are electrically connected to each other by a lead wire formed by metal plating through a communication hole provided in the cylindrical body and the guard portion and an inner peripheral surface of the through hole in the cylindrical body.
According to the second aspect, both ends of the secondary coil are connected by metal plating, thus eliminating the need to connect the both ends by the lead wire of the conductive wire. This can lead to further reduction in the occupied space and the size. This further facilitates the connection work, thereby enabling saving of labor, so that an electromagnetic device with even higher productivity can be obtained.
In a third aspect of the present invention, in the second aspect, there may be provided an operation indicator lamp, fixed to the guard portion and electrically connected to the secondary coil.
According to the third aspect, the operation indicator lamp provided on the guard portion is electrically connected to the secondary coil, thereby facilitating the connection work on the operation indicator lamp. In addition, with the operation indicator lamp installed directly on the guard portion, a large wiring space is not required and the device can thus be made more compact in size. Furthermore, the operation indicator lamp is lit by the induced current generated at the time when a voltage is applied to the primary coil, and hence an electromagnetic device with an energy saving can be obtained.
In a fourth aspect of the present invention, in the third aspect, the operation indicator lamp may be a light-emitting diode (LED).
According to the fourth aspect, it is possible to obtain an electromagnetic device provided with an operation indicator lamp with a further energy saving.
An electromagnetic relay according to a fifth aspect of the present invention has a configuration in which the above electromagnetic device according to any one of the first to fourth aspects is incorporated into a base.
According to the fifth aspect of the present invention, the secondary coil is formed by metal plating, so that the electromagnetic device is more compact in size and smaller in bulk than that of the conventional example It is thus possible to obtain a compact electromagnetic relay. It is not necessary to bind the extended wire of the coil to the coil terminal as in the conventional example, thus facilitating the connection work, so that an electromagnetic relay with high productivity can be obtained.
According to a sixth aspect of the present invention, in the fifth aspect, a movable iron piece may be disposed so as to be attracted by magnetic force to a magnetic pole portion of an iron core protruding from the flange portion provided at at least one end of the cylindrical body among iron cores inserted through the through holes of the spool, the magnetic force being generated by applying a voltage to any one of the primary coil and the secondary coil, and the movable iron piece may be provided with a notch through which light of the operation indicator lamp is transmitted.
According to the sixth aspect, the light of the operation indicator lamp provided on the guard portion of the electromagnetic device transmits through the notch provided in the movable iron piece, so that the light can be checked visually. It is therefore possible to visually check an operating state through the notch, thereby to obtain an electromagnetic relay with high safety and a user's sense of security.
According to a seventh aspect of the present invention, in the sixth aspect, there may be provided an operation check window configured to transmit the light of the operation indicator lamp on an outer peripheral surface of a casing fitted to the base.
According to the seventh aspect, the operation indicator lamp can be checked through the operation check window provided in the casing, and an electromagnetic relay with good usability can be obtained.
According to an eighth aspect of the present invention, in the seventh aspect, the operation check window may be a transparent window provided in the casing.
According to the eighth aspect, with no through hole provided in the casing, no fault occurs based on intrusion of dust or the like, and there is an effect that an electromagnetic relay with high reliability can be obtained.
Note that by appropriately combining freely selected embodiments or modifications of the above variety of embodiments and modifications, it is possible to achieve the respective effects of those combined. While it is possible to combine embodiments, combine examples, or combine an embodiment and an example, it is also possible to combine features in different embodiments or examples.
The electromagnetic device and the electromagnetic relay using the electromagnetic device according to the present invention are not limited to the above electromagnetic device and may be applied to other electromagnetic devices and electromagnetic relays incorporating the electromagnetic devices.
While the present invention has been fully described in connection with the preferred embodiments with reference to the accompanying drawings, a variety of modifications or corrections will be apparent to those skilled in the art. Such modifications or corrections are to be understood as being included in the scope of the invention according to the appended claims so long as not deviating therefrom.
10 electromagnetic relay
11 base
12 placement space
13 rib
14 press-fit groove
15 engaging claw portion
20 electromagnetic device
21 spool
22 cylindrical body
22
a communication hole
23 through hole
24 guard portion
25 guard portion
24
a communication hole
26 secondary coil
26
a pattern
26
b auxiliary pattern
26
c lead wire
26
d lead wire
26
e lead wire
30 primary coil
31 iron core
31
b magnetic pole portion
32 yoke
33 light emitting element
34 resistor
35 hinge spring
40 movable iron piece
41 horizontal portion
42 notch
50 contact mechanism
51 fixed contact terminal
51
a normally closed fixed contact
52 movable touch piece
52
a movable contact
53 fixed contact terminal
53
a normally open fixed contact
60 card
61 operating protrusion
70 casing
71 engagement hole
72 operation check window
Number | Date | Country | Kind |
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2015-179236 | Sep 2015 | JP | national |
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Number | Date | Country |
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101677043 | Mar 2010 | CN |
103515046 | Jan 2014 | CN |
S51-065244 | May 1976 | JP |
S59-090156 | Jun 1984 | JP |
H03-254035 | Nov 1991 | JP |
Entry |
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International Search Report issued in PCT/JP2016/075079, dated Nov. 15, 2016 (2 pages). |
Written Opinion issued in PCT/JP2016/075079, dated Nov. 15, 2016 (4 pages). |
Office Action issued in Chinese Application No. 201680040700.0 dated Sep. 5, 2018 (9 pages). |
Number | Date | Country | |
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20180144895 A1 | May 2018 | US |
Number | Date | Country | |
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Parent | PCT/JP2016/075079 | Aug 2016 | US |
Child | 15876072 | US |