JP2000058351A - Manufacture of core for isolation transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate bonding work of coil terminals and connecting terminals by making into a constitution, where the connecting terminals are arranged on the respective coil terminals in parallel with the winding axis direction of a coil, and the coil is attached on a core on which an arrangement trench arranging the coil and through-holes of the connecting terminals are formed in advance. SOLUTION: A core 1 for an isolation transformer is composed of synthetic resin, into which soft magnetic ferrite powder is mixed and molded annularly, and is a discoidal member having an aperture 1a at the center. An arrangement trench 1b is formed in the circumferential direction, and through-holes 1c penetrating the core 1 in the thickness direction are formed in the arrangement trench 1b. A coil 2, where square connecting terminals 3 are formed on the inner end and the outer end, parallel with the winding axis direction, is arranged in the arrangement trench 1b. An insulating cover of the coil 2 is peeled, and the connection terminals 3 are welded in parallel with the winding axis direction of the coil 2. Each connecting terminal 3 is inserted in the corresponding through-hole 1c, the coil 2 is arranged in the arrangement trench 1b, and the coil 2 is attached on the core 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a core for a separated transformer.

[0002]

2. Description of the Related Art A separation type transformer has a core having a coil and a corresponding coil arranged opposite to each other. Electromagnetic coupling between the corresponding coils allows electric power and electric signals to be transmitted between the two coils in a non-contact manner. Transmit. Such a separation type transformer is also used as a rotary type transformer in which each core relatively rotates. For example, an airbag mounted on a steering device of an automobile and provided on a steering side rotating from a steering column side fixed to a vehicle body. Can be used as transmission means for transmitting operating power and the like to the detonator.

[0003] In the core of such a separation type transformer, for example, a coil groove extending in the circumferential direction is formed on one surface of a disk-shaped core, and a coil formed of a ring-shaped winding is inserted into the coil groove. It is a common manufacturing method to attach the coil or drop the winding along the peripheral surface of the coil groove to form a coil corresponding to the groove shape in multiple layers. At this time, in manufacturing the separated type transformer, the coil terminal is drawn out of the core, and the coil terminal is joined to a connection terminal (tab) of a terminal block provided outside the core.

[0004]

By the way, in manufacturing the core, when the coil terminal and the connection terminal are joined,
Conventionally, ultrasonic welding, spot welding, or the like is used, and a welding jig is brought into contact with both surfaces of a joining portion to join. For this reason, when trying to join the coil terminal to the connection terminal provided on the terminal block as described above, the connection terminal is physically difficult because one surface is already joined to the terminal block, and does not work carefully. However, there is a problem that the joining operation between the coil terminal and the connection terminal is difficult, for example, the coil may be disconnected. Further, when the separation type transformer is used as a rotary type transformer, it is desirable that the extraction hole of the coil provided in the core be as small as possible in order to avoid a decrease in the effective relative magnetic permeability in terms of function. For this reason, when manufacturing the core of the separation type transformer, the operation of pulling the coil terminal out of the core is complicated and the workability is poor.

[0005] The present invention has been made in view of the above points, the joining operation of the coil terminal and the connection terminal is easy, and
An object of the present invention is to provide a method of manufacturing a core for a separation type transformer, in which a coil terminal can be very easily pulled out of the core without lowering the effective relative magnetic permeability of the core.

[0006]

In order to achieve the above object, in a first method of manufacturing a core for a separate type transformer according to the present invention, connection terminals are provided at respective coil terminals in parallel with the winding axis direction of the coil. The arrangement is such that the coil is attached to a core in which an arrangement groove for disposing the coil and an insertion hole for the connection terminal are provided in advance.

In order to achieve the above object, in a second method of manufacturing a core for a separated transformer according to the present invention, a connecting portion is provided at each of the coil terminals in parallel with the winding axis direction of the coil. The coil is mounted on a core provided in advance with an arrangement groove for disposing and a connection terminal connected to the connection portion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a method for manufacturing a separation type transformer core according to the present invention will be described below in detail with reference to FIGS. First, the first manufacturing method will be described. Separable transformer cores (hereinafter simply referred to as “cores”)
1) each include a soft magnetic material, for example, N
A soft magnetic ferrite powder such as i-Zn-based ferrite or Mn-Zn-based ferrite, or a synthetic resin such as nylon or polyphenylene sulfide (PPS) mixed in a predetermined amount into a ring-shaped synthetic resin is shown in FIG. As described above, a disc-shaped member having an opening 1a at the center, the arrangement groove 1b is formed in the circumferential direction, and the arrangement groove 1b is provided with two insertion holes 1c penetrating in the thickness direction. A coil 2 having square connection terminals 3 provided at the inner end and the outer end in parallel with the direction of the winding axis AW (see FIG. 2) is arranged in the arrangement groove 1b. 2 is a front view, and the state shown in FIG. 3 is a side view. At this time, each connection terminal 3 is inserted into the corresponding insertion hole 1c, and the tip protrudes out of the core 1. The core may be a ring-shaped soft magnetic ferrite sintered body (for example, a sintered body obtained by mixing a binder with Ni-Zn ferrite or Mn-Zn ferrite).

In this case, the coil 2 often uses an insulated enameled wire as a winding, and may be a round wire or a square wire. Mold into The coil 2 may be temporarily fixed with an adhesive in order to maintain the shape after molding, or may use a winding coated with a self-fusing agent that self-fuses by heat treatment.
After forming into a coil shape, heat treatment may be performed.

When the core 1 is assembled into a separate type transformer, a connection terminal 3 having a shape connectable to a coil attached to a cable cord terminal used for connection to an external circuit is selected and used. . Further, a soft magnetic material is
It refers to a material that has very little remanence. The core 1 configured as described above is manufactured as follows.

First, the insulating coating is peeled off from the inner end and the outer end of the coil 2 by applying a heating solder or the like, and the connection terminal 3 is connected by resistance welding in parallel with the winding axis AW direction of the coil 2 as shown in FIG. Provide. Next, as shown in FIG. 4, each connection terminal 3 is inserted into the corresponding insertion hole 1c, the coil 2 is arranged in the arrangement groove 1b, and the coil 2 is attached to the core 1 as shown in FIG.

Therefore, the manufactured core 1 can be easily connected to an external circuit by fitting, for example, a connector or the like to the tip of the manufacturing terminal 3 protruding outside the core 1. Further, the core 1 facilitates the joining work between the inner end or the outer end of the coil 2 and the connection terminal 3, has excellent joining reliability between the terminal of the coil 2 and the connection terminal 3, and lowers the effective relative magnetic permeability. Without the connection terminal 3, the terminal of the coil 2 can be pulled out of the core 1 very easily by the connection terminal 3.

Here, the connection terminals are shown in FIGS. 5 (a) and 5 (b).
As in the connection terminal 5 shown in FIG. 5, a rectangular tab with a splice band having a groove 5a for passing a rectangular wire at the joint with the rectangular wire is used, and the rectangular tab is provided at the inner end or the outer end of the coil 2 by a fusing method. Good. In the above embodiment, the case where the connection terminals 3 and 5 are provided after the coil 2 is formed has been described. However, when the connection terminals 3 and 5 are provided after the coil 2 is formed, particularly when the connection terminals 3 and 5 are provided at the inner end,
It is difficult to perform terminal treatment for removing the insulation coating. For this reason, the coil 2 may be formed into the coil 2 after the connection terminals 3 and 5 are provided at the terminal at the inner end.

On the other hand, as shown in FIG. 6, the core 1 is integrally molded with a metal locking member 6 in advance in the vicinity of the insertion hole 1c, or a portion corresponding to the locking member is integrally formed with a core material. After molding and attaching the coil 2 provided with the connection terminal 3 to the core 1, the attachment of the connection terminal 3 may be further reinforced by a synthetic resin 7. Further, like the connection terminal 8 shown in FIG. 7, a portion corresponding to the insertion hole 1c of the core 1 may be provided with a locking claw 8a or a portion having the same function as the locking claw 8a. The connection terminal 8 is press-fitted into the insertion hole 1c,
The locking claw 8a is locked and fixed to the insertion hole 1c.

Next, a second method of the present invention for manufacturing a core will be described. The core 10 is a disc-shaped member having an opening (not shown) in the center and having substantially the same configuration as the core 1. As shown in FIG. Two connection terminals 11 are integrally molded in the groove 10b so as to penetrate in the thickness direction. Here, each connection terminal 11 may have an insertion hole formed in the arrangement groove 10b, and may be attached to the insertion hole after the core 10 is formed.

In the arrangement groove 10b, a coil 12 having pin-shaped connecting members 13 provided at the inner end and the outer end in parallel with the direction of a winding axis (not shown) is arranged. Each connection terminal 11 is formed at one end with a fitting hole 11 a into which the upper end of the connection tool 13 is fitted, and the other end protrudes out of the core 10. Therefore, in the core 10, the upper end of each connecting member 13 is fitted into the corresponding fitting hole 11a, the coil 12 is arranged in the arrangement groove 10b, and the coil 12 is attached.

For this reason, similarly to the core 1 of the above-described embodiment, the manufactured core 10 is provided with an external circuit by, for example, fitting a connector or the like to the tip of the manufacturing terminal 11 protruding outside the core 10. And can be easily connected. Also,
The core 10 facilitates the joining operation between the inner end or outer end of the coil 12 and the connector 13, and furthermore, the terminal of the coil 12 and the connector 1
3. Therefore, the connection terminal 11 has excellent connection reliability and the terminal of the coil 12 can be pulled out of the core 10 very easily by the connection terminal 11 and the connector 13 without lowering the effective relative magnetic permeability. it can.

Here, as shown in FIGS. 9A and 9B, connection terminals 15 and 16 having fitting portions 15a and 16a, respectively.
Is integrally molded with the core or attached by post-attachment, and a connection tool 17 having a fitting portion 17a is provided at an inner end or an outer end of the coil 12, and the corresponding connection terminal 1 is provided.
5 and 16 may be fitted. Also, connection terminals 11, 1
The directions of the protrusions 5 and 16 are not limited to the direction parallel to the winding axis of the coil, but after projecting parallel to the winding axis, the bending in the direction perpendicular to the winding axis. You may.

FIG. 10 shows a modification of the first method of the present invention. A disc-shaped printed circuit board 20 for an electric circuit may be provided on the upper surface of the core 1. At this time, the printed circuit board 20 may be mounted with a circuit pattern necessary for the function of the separation type transformer using the core 1, or may be provided with, for example, a connector housing for providing a connector portion for leading out wiring. , And is fixed to the core 1 with screws 21. As shown in the figure, the connection terminal 8 attached to the coil 2 has the tip thereof connected to the conductor pattern hole 2 of the printed circuit board 20.
After penetrating through hole 0a, it is fixed to conductor pattern hole 20a with solder.

When the pitch of the connection terminals to be attached to the core 1 and the pitch of the connector portion pulled out of the core 1 are different, as shown in FIG. The connection terminals 22 are fixed in the conductor pattern holes 20a of the printed circuit board 20 and then fixed to the conductor pattern holes 20a by soldering. Then, the connection terminal 8 and the connection terminal 22 of the coil 2 may be connected by a circuit pattern of the printed circuit board 20. Further, a connector housing may be provided on the printed circuit board 20, and the connection terminal 22 may be attached to the connector housing.

[0021]

According to the first and second aspects of the invention, the joining operation between the coil terminal and the connection terminal is easy, the joining reliability between the coil terminal and the connection terminal is excellent, and the effective relative magnetic permeability of the core is reduced. It is possible to provide a method of manufacturing a core for a separation type transformer, in which a coil terminal can be pulled out of a core very easily without lowering.

[Brief description of the drawings]

FIG. 1 is a sectional front view of a core for a separation type transformer manufactured by a first method of the present invention.

FIG. 2 is a cross-sectional front view showing a state where connection terminals are provided on a coil used for the core of FIG. 1;

FIG. 3 is a side view of a connection terminal provided on the coil of FIG. 2;

FIG. 4 is a sectional front view showing a state where a coil is attached to the core of FIG. 1;

FIG. 5 is a side view (a) and a front view (b) showing the shape of another connection terminal provided on the coil.

FIG. 6 is a cross-sectional view showing another embodiment in which a connection terminal is fixed to a core with a resin.

FIG. 7 is a cross-sectional view showing still another mode in which the connection terminal is fixed to the core by a locking claw provided on the connection terminal.

FIG. 8 is a sectional front view showing a main part of a second method of the present invention.

FIG. 9 is a front view showing a main part according to a modification of the second method of the present invention.

FIG. 10 is a sectional view showing a modification of the first method of the present invention.

FIG. 11 is a sectional view showing another modified example of the first method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Separable transformer core 1a Opening 1b Arrangement groove 1c Insertion hole 2 Coil 3 Connection terminal 5 Connection terminal 5a Groove 6 Locking tool 7 Synthetic resin 8 Connection terminal 8a Locking claw 10 Separation type transformer core 10b Arrangement groove 11 Connection terminal 11a Fitting hole 12 Coil 13 Connector 15, 16 Connection terminal 15a, 16a Fitting part 17 Connector 17a Fitting part AW Winding shaft (of coil 2)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kim Toji 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Masahiro Hasegawa 2-6-1 Marunouchi, Chiyoda-ku, Tokyo No. Furukawa Electric Co., Ltd. (72) Inventor Hajime Mochizuki Furukawa Electric Co., Ltd. 2-6-1 Marunouchi, Chiyoda-ku, Tokyo

Claims (2)

[Claims] A connection terminal is provided in each of the coil terminals in parallel with the direction of the winding axis of the coil, and the coil is mounted on a core in which an arrangement groove for arranging the coil and an insertion hole for the connection terminal are provided in advance. A method of manufacturing a core for a separation type transformer, characterized by being attached. 2. A connection tool is provided in each of the coil terminals in parallel with the direction of the winding axis of the coil, and a core provided with an arrangement groove for arranging the coil and a connection terminal connected to the connection tool is provided in advance. A method of manufacturing a core for a separation type transformer, comprising attaching the coil.