JPH1094180A - Magnetic coupler for charging for electric motorcar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic coupler for charging for an electric motorcar which improves the abrasion resistance at the coupling face between primary and secondary cores, when supplying the charger with power, making use of electromagnetic induction. SOLUTION: A primary core 1 is made in E section by ferrite, and a center projection 12 and a peripheral projection 13 are projected. On the other hand, a secondary core 4 on opposite side is made in the same constitution, and a magnetic circuit is constituted by coupling them such that the fellow coupling faces (12A and 14A, and 13A and 15A) of the tips of the projections butt each other. Coating layers 3 and 6 by titanium carbonate are provided at the surface of each coupling face 12A, 14A, 13A, and 15A. Therefore, the cores 1 and 4 are prevented from abutting directly on each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle charging magnetic coupling device for charging a power storage device of an electric vehicle.

[0002]

2. Description of the Related Art Among systems for charging a power storage device of an electric vehicle, those using electromagnetic induction have been developed.
A magnetic coupling device used in this type of charging system couples a primary core provided on a charging connector side and a secondary core provided on an electric vehicle side. Ferrite, silicon steel, or the like is used as a material for these cores.

[0003]

However, in the above configuration, the cores are brought into direct contact with each other and are used repeatedly for many years, so that the joint surfaces of the cores may be broken due to wear, impact, or the like. I am worried. The present invention has been made in view of the above circumstances, and an object of the present invention is to supply a power storage device of an electric vehicle by using electromagnetic induction when a primary and a secondary core are connected to wear. Another object of the present invention is to provide a magnetic coupling device for charging an electric vehicle with improved operability.

[0004]

According to a first aspect of the present invention, there is provided a magnetic coupling device for charging an electric vehicle, wherein a charging connector having a primary coil is mounted on the electric vehicle. And the secondary coil of the electric vehicle are coupled via a magnetic circuit, and the primary coil is excited by an external charging power supply to charge the power storage device of the electric vehicle by an electromotive force induced in the secondary coil. Wherein the magnetic circuit is configured by joining a primary core and a secondary core, and at least one of the two cores has a coating layer made of a wear-resistant material on a joint surface where the two cores are joined. It has features where it is formed.

[0005]

When charging an electric vehicle, a charging connector provided with a primary coil is mounted on the electric vehicle, and a primary circuit and a secondary core are joined to form a magnetic circuit. The coil and the secondary coil are connected via the magnetic circuit. Then, the primary coil is excited by an external power supply for charging, so that an electromotive force is induced in the secondary coil to charge the power storage device of the electric vehicle. At the time of this charging, it is preferable that the primary core and the secondary core are joined as close as possible, and the charging operation needs to be repeatedly performed. However, claim 1
According to the invention, at least one of the primary core and the secondary core has a coating layer formed of a wear-resistant material on its joint surface, so that both cores come into contact via the coating layer. . Therefore, even if the charging operation is repeatedly performed, wear and loss of the core can be prevented. Of course, since the coating layer itself has abrasion resistance, there is no fear of the abrasion.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> Next, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a state in which a connector on the vehicle side and a connector on the power supply side are coupled. 1 is a power supply side connector 8 including the primary coil 2. The vehicle-side connector 7 is provided on a vehicle body of the electric vehicle, and is fixed in a power receiving concave portion provided on, for example, a side portion of the vehicle body, not shown in detail. On the other hand, the power supply side connector 8 is connected to a charging power supply provided in a parking lot or a charging stand, for example, and is mounted in the power receiving recess when the electric vehicle is charged.

In the vehicle-side connector 7, the secondary core 4 is made of, for example, ferrite, which is a ferromagnetic material, is formed in an E-shaped cross section, and each of the central and peripheral projections 14, 1 is formed.
5 faces the primary core 1 at the coupling surfaces 14A and 15A which are the tips. In the present embodiment, ferrite is used as the material of the cores 1 and 4. However, the present invention is not limited to this. For reducing the leakage of magnetic flux from the magnetic circuit during charging, a ferrite having a high magnetic permeability is used. Any material made of a magnetic material may be used. The secondary coil 5 is wound around the central projection 14 of the secondary core 4. The secondary coil 5 is formed by winding a magnet wire around the central protrusion 14 of the secondary core 4 many times, and is connected to a power storage circuit of an electric vehicle (not shown) to induce an electromotive force induced by the secondary coil 5. Thus, the battery for powering the electric vehicle can be charged.

In the secondary core 4, a coating layer 6 of titanium carbide, which is a wear-resistant material, is formed on the coupling surface 14 A of the central projection 14, the coupling surface 15 A of the peripheral projection 15, and the side surface 16. For example, it is formed by sputtering. As a material of the coating layer 6, it is preferable to use a substance having high wear resistance and low electric conductivity, such as chromium nitride and vanadium carbide, in addition to titanium carbide.

Next, the lower power supply connector 8 will be described. The power supply connector 8 includes the primary coil 2 and the primary core 1 and is housed in a housing (not shown). The configuration of the primary core 1 and the primary coil 2 is the same as the configuration of the secondary core 4 and the secondary coil 5, respectively. That is, the primary core 1 is made of ferrite and formed in an E-shaped cross section. The primary core 1 faces the secondary core 4 at the coupling surfaces 12A and 13A at the tips of the projections 12 and 13 at the center and the periphery. The primary coil 2 is wound around the central projection 12. The primary coil 2 is connected to a charging power supply (not shown), and a high-frequency current of, for example, 100 KHz flows therein. And, also in the primary core 1, the central protrusion 1
The coating layer 3 of titanium carbide, which is a wear-resistant material, is formed on the bonding surface 12A, the bonding surface 13A, and the side surface 17 of the peripheral protrusion 13 by, for example, sputtering.

Next, the operation and effect of this embodiment configured as described above will be specifically described. When charging the electric storage device of the electric vehicle, first, the coupling surfaces (12A and 14A, 13A and 15A) of the protruding portions (12 and 14, 13 and 15) facing each other with the two cores 1 and 4 being coaxial. The magnetic circuit can be formed by coupling. Here, when a high-frequency current flows from the charging power supply to the primary coil 2, an induced current is generated in the secondary coil 5 by electromagnetic induction, and the power storage device of the electric vehicle is charged.

In such a charging operation, the primary core 1 is joined so as to abut against the secondary core 4. In the present embodiment, the coating layers 3, 3 of titanium carbide are formed on the surfaces of the cores 1, 4. Since the core 6 is formed, the cores 1 and 4 are prevented from contacting each other and causing wear and chipping. Of course, the coating layers 3 and 6 themselves
Since it has abrasion and abrasion resistance, there is no fear of the abrasion.

<Second Embodiment> Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment and the first embodiment, the same components are denoted by the same reference numerals, and overlapping description will be omitted. The main difference between the second embodiment and the first embodiment is the material of the coating layers 20, 21. In the second embodiment, coating layers 20 and 21 of Sumiflon (trade name; general name is polytetrafluoroethylene) are formed. Further, in this embodiment, the coating layers 20 and 21 are connected to the connecting surfaces 12A and 14A of the central protrusions 12 and 14 of the primary core 1 and the secondary core 4, and to the connecting surfaces 13 of the peripheral protrusions 13 and 15.
A, 15A only. Even with such a configuration, since the Sumiflon has abrasion resistance, the effect of preventing abrasion and loss of the cores 1 and 4 can be obtained as in the first embodiment.

The present invention may have various other embodiments. For example, the following embodiments are also included in the technical scope of the present invention. The coating layer may have a structure defined on one of the bonding surfaces of the primary core and the secondary core. The cross-sectional shape of the core is not limited to the E-shape, and can be applied to, for example, a combination of an E-shape and an I-shape, and a connection surface of L-shapes.

[Brief description of the drawings]

FIG. 1 is a charging connector for an electric vehicle according to a first embodiment.

FIG. 2 is a charging connector for an electric vehicle according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Primary core 2 ... Primary coil 3, 6, 20, 21 ... Coating layer 4 ... Secondary core 5 ... Secondary coil 7 ... Power supply side connector 8 ... Vehicle side connector 12A, 13A, 14A, 15A ... Coupling surface

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yosei Exit 1-3-1 Shimaya, Konohana-ku, Osaka-shi, Osaka Sumitomo Electric Industries, Ltd. (72) Inventor Joichi Kanakawa 1 No. 14 Sumitomo Wiring Systems, Ltd.

Claims (1)

[Claims] 1. A charging connector provided with a primary coil is mounted on an electric vehicle, and the primary coil and a secondary coil on the electric vehicle side are connected via a magnetic circuit. For charging a power storage device of the electric vehicle by an electromotive force induced in a secondary coil by being excited by a power source, wherein the magnetic circuit is configured by joining a primary core and a secondary core 3. The magnetic coupling device for charging an electric vehicle according to claim 1, wherein a coating layer made of a wear-resistant material is formed on at least one of the two cores on a coupling surface where the two cores are coupled.