JP2000353630A - Noncontact type transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reliable noncontact type transformer which can suppress heat generation in the transformer. SOLUTION: In this noncontact type transformer mounted around the shaft of the steering wheel of a 4-wheeled car for power supply to the steering wheel and for signal transmission thereto, a part or the entire core surface of the transformer made of a pair of ring-shaped magnetic cores 1 having at least one concentric or radial groove for the reception of a winding 2, as well as the winding are coated with a resin 3 for heat sink or are molded. Furthermore, the ring-shaped magnetic core 1 is made of an oxide magnetic material or metallic magnetic material.

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, and more particularly, to a non-contact type transformer mounted around an axis of a handle portion of a four-wheeled vehicle and supplying power and transmitting signals at the handle portion. Things.

[0002]

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

[0003] In order to improve this point, recently, a four-wheeled vehicle which has an electrical control switch on a steering wheel and does not need to be released from the steering wheel even at the time of operation has been widely used in consideration of safety. . In this case, a wired method is used to receive and supply power to and from the operation system in the handle portion, so that the wire is not disconnected by the handle rotation operation,
A flexible wire having spring properties is used.

FIG. 4 is a perspective view schematically showing a configuration of a conventional wired electrical system. As shown in FIG. 4, the wired electrical system has a shape in which a flat cable 7 in which a plurality of wires are parallelized is rounded, and both ends thereof are electrodes 8, and even if the handle is rotated, the wires are not tensioned. It does not break and does not break.

[0005] However, in this wired electrical system, the flexible wire must be mounted so that it can be rotated left and right evenly when the handle is operated. It is a task that takes time.

[0006] In addition, some users argue that the wires are rubbed at the time of work, so that the product life is short, and that the sound generated when the wires are rubbed and the slight resistance generated when operating the steering wheel impair comfort. Exists.

[0007] Many proposals have been made to solve these problems, and one of them is a method of supplying power and transmitting signals by an electromagnetic induction method using a non-contact type transformer.

[0008]

However, in a conventional electromagnetic induction system using a non-contact type transformer, the transformer itself is a heating element due to power loss such as iron loss of a magnetic core and copper loss of a winding part. Therefore, there is a problem that heat is accumulated inside the sealed handle portion and further propagates to the surroundings, which may cause malfunction of the peripheral electronic circuit.

Therefore, the present invention suppresses the heat generation of the transformer, reduces the heat accumulation and temperature rise in the peripheral portion,
An object of the present invention is to provide a non-contact type transformer in which the reliability of an electric circuit device related to power supply and demand is improved.

[0010]

According to the present invention, a resin film for a heat sink is formed on a magnetic core and a winding so that the resin layer absorbs heat energy generated by a transformer, and a peripheral portion is formed. And a highly reliable non-contact type transformer can be obtained.

That is, the present invention relates to a non-contact type transformer comprising a pair of ring-shaped magnetic cores each having at least one or more concentric and radial grooves for storing windings. This is a non-contact type transformer in which part or all of the surface and the windings are overcoated or molded with a resin for a heat sink.

Further, the present invention is the non-contact type transformer wherein the ring-shaped magnetic core is made of an oxide magnetic material.

Further, the present invention is the non-contact type transformer, wherein the ring-shaped magnetic core is made of a metal magnetic material.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view of the basic structure of a non-contact type transformer according to the present invention. FIG. 1 (a) is a plan view and FIG.
(B) is a sectional view.

FIG. 2 is an enlarged view of a cross section of a groove and a winding of a magnetic core of the non-contact type transformer shown in FIG.

FIG. 3 is a plan view showing the groove arrangement of the non-contact type transformer according to the present invention.

As shown in FIGS. 1 and 2, a non-contact type transformer 10 is provided on a pair of ring-shaped magnetic cores 1 opposed to each other with a gap therebetween, and on an opposing surface of the magnetic cores 1. The surface of the magnetic core 1 and the winding portion 2 in the groove 5 are overcoated with a resin 3 for a heat sink. Lead wires drawn from the windings 2 are mounted in radial grooves 6 shown in FIG. 3, and the surface thereof is overcoated or molded with a heat sink resin 3.

One of magnetic cores 1 constituting a non-contact type transformer 10 for relaying an operation system in a steering wheel portion of a four-wheeled vehicle and a system in a vehicle body is fixed to a vehicle body side, and the other is a steering wheel side. It is attached to and rotates in accordance with the rotation of the steering wheel.

At this time, the steering operation is mechanically transmitted to the axle.
A through hole 4 is needed to pass the shaft
Therefore, the magnetic core 1 is formed in a ring shape. this
The magnetic core 1 has an outer diameter of 75 mm, an inner diameter of 48 mm, and a thickness of 3 mm.
mm, 52.7 mol% Fe ₂O₃-39.3 mol%
NiO-8.0 mol% ZnO Mn-Zn Blow
And at least one is provided on the plane of the magnetic core 1.
The concentric grooves (5a, 5a, 5a in FIG. 1 and FIG. 2)
b, 5c, 5d) are formed, and the windings 2
Is stored.

A heat sink resin having a heat absorbing effect is applied to the flat and side surfaces of the ring-shaped magnetic core 1 and dried, and a uniform heat of several hundred μm is applied to the surface of the magnetic core 1 by a sink resin. 3 is formed. After that, the winding 2 is incorporated into the groove 5 formed in the magnetic core 1, and furthermore,
A resin 3 for a heat sink is poured into a gap between the groove 5 of the magnetic core 1 and the winding 2, dried, and a similar film is formed on the surface of the winding 2.

The resin for the heat sink is obtained by adding 30 to 80% by weight of a metal filler to an epoxy resin serving as a base. As the metal filler, a metal having high thermal conductivity such as Ag, alumina or boron nitride is used. And several W
/ M · K to several tens of W / m · K. As substitutes, T7109, T6 manufactured by EPOTEK
116, T6115, DM6030H manufactured by DIEMAT
k.

The process of temperature rise due to heat generation on the surface of the non-contact type transformer 10 when the heat sink resin 3 was applied using the non-contact type transformer 10 and when the resin 3 was not applied was observed. The resin used for the heat sink is DIEMA
A DM6030Hk (thermal conductivity: 30 W / m · K) manufactured by T Company was used, the input was 12 V / 15 W, and a sine wave input with a frequency of 125 kHz by a function generator was used. As a result, the rate of increase in the temperature when the coating was performed was reduced by about 30%, and the saturation temperature was also reduced by about 16 ° C. as compared with the rate of the temperature increase when the coating was not performed.

The magnetic core 1 used in the non-contact type transformer 10 is not limited to ferrite, and may be a metal magnetic material having a magnetic permeability equal to or higher than that of a ferrite material. However, the number of grooves 5 provided in the magnetic core 1 is not limited to four. Also,
The resin 3 for the heat sink formed on the surface of the non-contact type transformer 10 may be formed by integrally molding with a mold resin having an equivalent heat sink effect, instead of coating by application.

[0025]

According to the present invention, by forming a film made of a resin for a heat sink on the surface of the core and the winding portion used in the transformer, the temperature rise due to the heat generation of the transformer can be reduced, and the reliability of the transformer can be improved. A contact type transformer can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a basic configuration of a non-contact type transformer according to the present invention. FIG. 1A is a plan view. FIG. 1B is a sectional view.

FIG. 2 is an enlarged view of a part of a cross section of the non-contact type transformer according to the present invention.

FIG. 3 is a plan view showing a groove arrangement of the non-contact type transformer according to the present invention.

FIG. 4 is a schematic diagram of a configuration of a conventional wired electrical system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 (Ring-shaped) magnetic material core 2, 2a, 2b, 2c, 2d Winding 3 Resin for heat sink 4 Through hole 5 (Concentric) groove 5a, 5b, 5c, 5d groove 6 (radial) groove 7 Flat cable 8 (Flat cable mounting) electrode 10 Non-contact type transformer

Claims (3)

[Claims] 1. A non-contact type transformer comprising a pair of ring-shaped magnetic cores each having at least one or more concentric and radial grooves for storing windings, wherein a part of the surface of the magnetic core is provided. Alternatively, a non-contact type transformer characterized in that all and windings are overcoated or molded with a resin for a heat sink. 2. The non-contact type transformer according to claim 1, wherein said ring-shaped magnetic core is made of an oxide magnetic material. 3. The non-contact type transformer according to claim 1, wherein the ring-shaped magnetic core is made of a metal magnetic material.