JP2001076948A - Noncontact-type transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a noncontact-type transformer, in which delivery of a signal is surely enabled, when a gap exists in the steering axis direction between a primary side magnetic material core and a secondary side magnetic material core. SOLUTION: This noncontact-type transformer 10 is constituted by making an outside cylindrical magnetic material core 1 and an inside cylindrical magnetic material core 2 face each other. Each of the outside core 1 and the inside core 2 is of a low closed-end cylinder type, and one bottom surface of the cylinder is opened. The aperture surfaces are made to face each other, and the inside core 2 is arranged to creep along into the inside of the outside core 1. Circumferential trenches are formed on the side surface inner wall of the outside core 1 and on the side wall of the inside core 2. Windings 3a, 4a are arranged in the trenches, and each of the windings is positioned on the same surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact type transformer mainly mounted around an axis of a steering wheel portion of a four-wheeled vehicle and suitable for supplying power and transmitting signals at the steering wheel portion. is there.

[0002]

2. Description of the Related Art At present, automobiles are widely used worldwide. There are many models with air conditioners and cruise control, but most of the electrical systems are concentrated around the front panel and near the base of the steering wheel.

[0003] For this reason, when operating the electrical system, one hand is temporarily removed from the steering wheel, and when the vehicle is running at a high speed or the like, there is a high possibility that the steering wheel operation is incorrect and a large accident occurs. In order to improve this point, recently, there is a control switch of the electrical system on the handle part,
A four-wheeled vehicle that does not need to be released from the steering wheel even during operation and that takes safety into consideration is becoming widespread.

[0004] In this case, a wired method is used to receive and supply power to and from the operation system in the handle portion, and a flexible wire having spring properties is used so as not to be disconnected by rotating the handle. .

FIG. 6 is a schematic diagram showing the configuration of a conventional wired electrical system. In FIG. 6, 71 is a flat cable, and 81 is a flat cable mounting electrode. This is a shape in which a flat cable 71 in which a plurality of wires are made parallel is rounded, and even if the handle rotates,
The structure is such that tension is not applied to the wire and it does not break.

FIG. 4 shows another example of a non-contact type transformer 13 using a disc-shaped magnetic core, which is capable of supplying power and transmitting signals in an electromagnetic induction type. Show.

Here, the structure of the non-contact type transformer 13 is as follows.
A plurality of concentric grooves are provided in one plane of the pair of disk-shaped magnetic cores 101 and 201, and windings are arranged in the grooves so that the windings face each other. I have.

[0008]

However, in the above-mentioned wired electrical system, the flexible wire must be mounted so that it can be rotated to the left and right evenly in the operation of the steering wheel, so that it is in a neutral position. It has to be a very time-consuming job.

Also, some users argue that the wire rods rub against each other during the operation, so that the product life is short, and that the noise generated when the wires rub, and the slight resistance when operating the steering wheel cause a loss of comfort. Exists.

[0010] The non-contact type transformer as another example has the following problems. That is, when this non-contact type transformer is incorporated into an actual machine such as a steering wheel, a steering wheel is disposed between a disk magnetic core on the primary side (transmitting side) and a magnetic core on the secondary side (receiving side). If there is no play portion of 3 mm or more with respect to the axial direction, there is a limitation in the process that the assembling becomes difficult.

Such a gap of 3 mm between the disk-shaped magnetic cores is a relatively large value in a non-contact type transformer, and the electromagnetic gap between the primary winding and the secondary winding is large. There has been a problem that the coupling state is reduced, sufficient power is not supplied, and transmission / reception of a signal is hindered.

In order to improve the coupling state by increasing the power, it is necessary to enlarge the shape of the magnetic core. Therefore, the product design should be performed in a desirable direction in view of electromagnetic interference due to leakage magnetic flux, cost, weight, and the like. Was not.

Accordingly, it is an object of the present invention to provide a non-contact method for reliably transmitting and receiving signals even if there is a gap in the steering axis direction between the primary magnetic core and the secondary magnetic core. Is to provide a type transformer.

[0014]

A non-contact type transformer according to the present invention comprises a low-profile cylindrical outer cylindrical magnetic core having one open bottom and an inner cylindrical magnetic core.
One of the cores is arranged so as to enter the other core, grooves are provided on the outer wall of the side wall of the inner cylindrical magnetic core, and the inner wall of the side wall of the outer cylindrical magnetic core, and a winding is applied to the groove. The wire is fixed so as to be positioned on the same plane, and the gap between the winding on the outer wall of the side wall of the inner cylindrical magnetic core and the winding on the inner wall of the side wall of the outer cylindrical magnetic core is 3 mm or less. Set to be a gap.

Since the gap between the winding portion of the outer core and the winding portion of the inner core is a narrow gap, signal transmission efficiency is improved and transmission can be reliably performed. In addition, since a clearance of 3 mm or more can be secured between the primary magnetic core and the secondary magnetic core in the steering axis direction, the trouble in assembling into the actual machine has been solved.

That is, the present invention relates to a non-contact type transformer comprising an outer cylindrical magnetic core and an inner cylindrical magnetic core opposed to each other, wherein the outer cylindrical magnetic core, the inner cylindrical The type magnetic core is a low-bottom cylindrical shape with a bottom and one of the bottom surfaces is open, the opening surfaces are opposed to each other, and the side wall of the inner cylindrical magnetic core is
Circumferential grooves are provided on the inner side wall of the outer cylindrical magnetic core, and are provided on the inner wall of the side wall of the outer cylindrical magnetic core and on the side wall of the inner cylindrical magnetic core, respectively. A non-contact type transformer in which windings are arranged in grooves and each winding is located on the same plane.

Further, the present invention provides the non-contact type transformer, wherein a plurality of side walls are installed concentrically on the outer cylindrical magnetic core and the inner cylindrical magnetic core,
A winding is wound on each of the side walls, and the windings are all non-contact type transformers located on the same plane.

Further, according to the present invention, in the non-contact type transformer, a distance between a winding wound on a side wall of the outer cylindrical magnetic core and a winding wound on a side wall of the inner cylindrical magnetic core is provided. Is a non-contact type transformer of 3 mm or less.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A non-contact type transformer according to an embodiment of the present invention will be described below.

(Embodiment 1) FIG. 1 is a diagram showing a configuration of a non-contact type transformer 10 of Embodiment 1 according to the present invention. FIG.
FIG. 1A is a plan view of an outer cylindrical magnetic core, and FIG.
FIG. 1B is a cross-sectional view of the non-contact type transformer, and FIG.
(C) is a plan view of the inner cylindrical magnetic core.

As shown in FIG. 1, a non-contact type transformer 10
Has a shape in which a low-profile cylindrical outer cylindrical magnetic core 1 having an open bottom surface and an inner cylindrical magnetic core 2 are combined. Each of the magnetic cores 1 and 2 has an outer shape. The inner cylindrical magnetic core 2
So as to enter the inside of the outer cylindrical magnetic core 1,
They are arranged with their opening surfaces facing each other.

Of these, the inner cylindrical magnetic core 2 has
The cylindrical side wall and the outer cylindrical magnetic core 1 are also provided with a cylindrical side wall, and a groove is provided in the circumferential direction of the opposing side walls. And 4a to form a set of windings.

When a non-contact type transformer composed of the outer cylindrical magnetic core 1 and the inner cylindrical magnetic core 2 is incorporated in an actual machine, a shaft for mechanically transmitting a steering operation to an axle. The outer cylindrical magnetic core 1 and the inner cylindrical magnetic core 2 are provided with circular through holes 5a and 5b at the center of the bottom surface.

(Embodiment 2) FIG. 2 is a sectional view showing the structure of a non-contact type transformer 11 according to Embodiment 2 of the present invention.
In the non-contact type transformer 11 shown in FIG. 2, both the outer cylindrical magnetic core 6 and the inner cylindrical magnetic core 7 have a structure in which three side walls are arranged concentrically.

A groove is formed on each side wall of the outer cylindrical magnetic core 6 and the inner cylindrical magnetic core 7 in the circumferential direction of each side wall, similarly to the embodiment shown in FIG. I have.

Each groove is provided with a winding in the circumferential direction, and each winding 3b and 4b, 3c and 4c, 3d and 4d
Are opposed on each side wall, and all of the preceding windings are arranged on the same plane. In this case, since there are three pairs of windings facing each other, three channels can be provided for transmission and reception of signals.

A non-contact type transformer was constructed based on the embodiment shown in FIG. 2 and various tests were conducted. Outer cylindrical magnetic core 6 and inner cylindrical magnetic core 7 according to the present invention
The material used was a permalloy-based magnetic material, which is a high-permeability magnetic material, and the shape was adjusted by cutting to produce each magnetic core.

In the present non-contact type transformer, the primary side (transmitting side) is set as the outer cylindrical magnetic core 6 and the secondary side (receiving side) is set as the inner cylindrical magnetic core 7. A winding was applied to the side wall of the core.

The dimensions of the outer cylindrical magnetic core 6 were an outer diameter φ75 mm, a height 10 mm, and a wall thickness 5 mm. The inner cylindrical magnetic core 7 has an outer diameter of 63 m.
m, height 10 mm, and wall thickness 5 mm. Here, when the outer cylindrical magnetic core 6 and the inner cylindrical magnetic core 7 abut against each other, the outer cylindrical magnetic core 6 and the inner cylindrical magnetic core in the axial direction (vertical direction in FIG. 2). 7 were arranged and fixed so that the distance between them became 3 mm.

Further, provided on both cylindrical magnetic cores,
The distance between the windings housed in the three side walls was all set to 1 mm. Of the three windings, the outermost winding set, the winding 3b and the winding 4b, was used for power supply, and the other winding set was used for signal transmission.

Using this non-contact type transformer 11, the transmission efficiency was measured. The input voltage is 12V / 15W and the frequency by the function generator is 125kHz.
Sine wave input. The output voltage was measured with a spectrum analyzer, and the output power was obtained. As a result, an output voltage of 9 W was obtained.

For comparison, a similar test using a conventional non-contact transformer was also attempted. The conventional non-contact type transformer 13 shown in FIG. 4 described above was tested.

A pair of disc-shaped magnetic cores 101 and a disc-shaped magnetic core 201 are formed by providing a plurality of grooves on a concentric circumference, with the grooves accommodating the respective windings facing each other. Is done. Windings 31a and 41a, and winding 31b
And 41b, and the windings 31c and 41c form a pair.

The disk-shaped magnetic material core 101 and the disk-shaped magnetic material core 201 are made of a permalloy-based magnetic material and have an outer diameter of 65 mm and a thickness of 5 mm. A non-contact type transformer was configured so that the windings faced each other. At that time, the distance between the windings was arranged and fixed so as to be 3 mm. As a result of measuring the transmission efficiency under the same conditions, an output power of 6 W was obtained.

From the above results, it was confirmed that the non-contact type transformer according to the present invention has improved transmission characteristics as compared with the conventional non-contact type transformer due to the narrow gap between the windings.

(Embodiment 3) FIG. 3 is a sectional view showing the structure of a non-contact type transformer 12 according to Embodiment 3 of the present invention.
The non-contact type transformer 12 shown in FIG. 3 is such that the magnetic cores of the outer cylindrical magnetic core 8 and the inner cylindrical magnetic core 9 are not provided with a groove, and are provided on the side wall surfaces of both magnetic cores. Winding 3
e and 4e are directly wound. Also in this case, similarly to the above-described embodiment, the transmission efficiency is improved by narrowing the gap between the windings 3e and 4e.

The position of the power winding is not limited to the above-described embodiments. For example, the arrangement at the innermost side or at the second side may be arbitrary, and the number of grooves and the total number of windings provided in the non-contact type transformer are the same as those in the previous embodiment. However, the present invention is not limited to this.

Further, in the embodiment 2 shown in FIG. 2, the outer cylindrical magnetic core 6 is the primary side and the inner cylindrical magnetic core 7 is the secondary side. The selection may be reversed.

The conventional non-contact type transformer has been configured using a disk-shaped core. However, when assembling the actual device into a handle or the like, it is necessary to secure an axial gap of 3 mm or more. There was a problem of decline. However, by forming a non-contact type transformer using the cylindrical magnetic core according to the present invention, it is possible to reduce the gap between the primary winding and the secondary winding, thereby improving the transmission efficiency. Can be provided.

At the same time, an axially outer cylindrical magnetic core,
Since the gap between the inner cylindrical magnetic cores can be ensured to be 3 mm or more, the problem in the process of assembling the actual machine into a handle or the like has been solved.

[0041]

As described above, according to the present invention, even if there is a gap between the magnetic core on the primary side and the magnetic core on the secondary side in the steering axis direction, the transmission and reception of signals can be performed reliably. A non-contact type transformer can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of a non-contact type transformer according to the present invention. FIG. 1A is a plan view of an outer cylindrical magnetic core, FIG. 1B is a cross-sectional view of a non-contact type transformer, and FIG.
(C) is a plan view of the inner cylindrical magnetic core.

FIG. 2 is a sectional view showing a configuration of a non-contact type transformer according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a configuration of a third embodiment of the non-contact type transformer according to the present invention.

FIG. 4 is used in the non-contact type transformer according to the present invention;
FIG. 4 is a schematic view of a cylindrical magnetic core having three side walls and one of the bottom surfaces being opened.

FIG. 5 is a sectional view showing a configuration of a conventional non-contact type transformer.
FIG. 5A is a top view, and FIG. 5B is a cross-sectional view.

FIG. 6 is a schematic diagram of a configuration of a conventional wired electrical system.

[Explanation of symbols]

10, 11, 12, 13 Non-contact type transformer 1, 6, 8 Outer cylindrical magnetic core 2, 7, 9 Inner cylindrical magnetic core 3a, 3b, 3c, 3d, 3e, 31a, 31b Winding 4a, 4b, 4c, 4d, 4e, 41a, 41b Windings 5a, 5b, 5c, 5d, 5e, 5f, 51a, 51b
Through-hole 7a Cylindrical magnetic core 61, 62, 63 Side wall 101, 102 Disc-shaped magnetic core 71 Flat cable 81 Flat cable mounting electrode

Claims (3)

[Claims] 1. A non-contact type transformer having an outer cylindrical magnetic core and an inner cylindrical magnetic core facing each other, wherein the outer cylindrical magnetic core and the inner cylindrical magnetic core are provided. Both have a low-profile bottomed cylindrical shape and one of the bottom surfaces is open, the opening surfaces are opposed to each other, and the side wall of the inner cylindrical magnetic core is the outer cylindrical magnetic core. Circumferential grooves are provided on the inner side wall of the side wall of the outer cylindrical magnetic core and on the side wall of the inner cylindrical magnetic core, respectively. And the windings are located on the same plane. 2. The non-contact type transformer according to claim 1, wherein the outer cylindrical magnetic core and the inner cylindrical magnetic core have a plurality of side walls installed concentrically, and each of the side walls is provided on each of the side walls. Is a non-contact type transformer, wherein windings are wound, and the windings are all located on the same surface. 3. The non-contact type transformer according to claim 1, wherein a winding is wound on a side wall of the outer cylindrical magnetic core and a winding is wound on a side wall of the inner cylindrical magnetic core. A non-contact type transformer having a distance of 3 mm or less.