JPH10257698A - Noncontact-type method for supplying power - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method which enables noncontact and efficient supplying of power. SOLUTION: Two cores 2 formed flat are disposed, so that the respective flat surfaces 2a face each other, while a coil 4 is wound on each of these two cores 2. Moreover, a separate coil 3 is wound on a core 1, which can be inserted between the two cores 2 and is formed flat. This core 1 is inserted between the two cores 2, and power is supplied from one coil to the other in a noncontacting manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for supplying power to a moving body, and more particularly to a non-contact power supply method capable of supplying power efficiently in a non-contact manner.

[0002]

2. Description of the Related Art The following method is known as a method for supplying electric power from an electric device to another electric device in a non-contact manner. As shown in FIG. 3, an induction path composed of two conductors 31 is laid in the direction in which the moving body should move, and a primary current is passed through this induction path. An iron core and a coil (pickup coil) 32 are mounted on the moving body, and the moving body receives power supply in a non-contact manner while moving along the guide path. In FIG. 3A, an iron core around which a coil 32 is wound is located between two conductors 31 of the guide path, and the iron core and the guide path are orthogonal to each other. FIG. 3 (b) shows that the winding diameter of the coil is two times that of the guide path.
The coil 32 is located on the conductors 31 and 31, which is equal to the distance between the conductors 31 and 31. The iron core and the taxiway are orthogonal to each other.

[0003]

What is shown in FIG. 3 is as follows.
Since the pickup coil moves along the guide path, power can be continuously supplied in a non-contact manner while the moving body is moving. However, on the other hand, the moving direction of the moving body is limited to a line along the taxiway.

[0004] On the other hand, in order to achieve free or planar movement of the moving body, there is a moving body equipped with a rechargeable battery and moving using the power of the battery. In this case, the moving direction is not limited for power supply. As described above, when a rechargeable battery is used, a charging electrode is attached to a moving body to simplify charging, and a power source side electrode connected to a power source is installed in a moving field where the moving body moves. However, it has been proposed to supply power by contact between electrodes.

[0005] However, since the charging electrode is exposed, there is a risk of electric leakage due to careless contact, and there is a problem in durability of the electrode.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a non-contact type power supply method capable of supplying power efficiently in a non-contact manner.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is to dispose two flat iron cores so that their respective flat surfaces face each other, and to attach a coil to each of these two iron cores. Winding, another coil is wound around a flat iron core that can be inserted between these two iron cores, this iron core is inserted between the two iron cores, and power is supplied from one coil to the other coil without contact. Is what you do.

Protrusions may be formed at the ends of the three planes of the three iron cores facing each other, and a magnetic circuit may be formed via these protuberances when power is supplied.

[0009] Any one of the above-mentioned iron cores is mounted on a moving body, a coil wound around the iron core is connected to a rechargeable battery of the moving body, and the above-mentioned another core is wound around a moving field where the moving body moves. It may be fixedly installed and the other coil may be connected to a power source.

[0010]

An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, in a power supply device based on the non-contact power supply method of the present invention, two flat iron cores 2 are separated by a predetermined gap. Are arranged such that the respective deflected planes 2a face each other. Coils 4, 4 are wound around these two cores 2, 2, respectively. On the other hand, another coil 3 is wound around the flat core 1 that can be inserted between the two cores 2. This iron core 1
When inserted between two iron cores 2 and 2, power can be supplied from one coil to the other coil in a non-contact manner. A high-frequency iron core material is used for each of the iron cores 1 and 2.

Protruding portions 1b, 2b are provided at the ends of the mutually opposed flat surfaces 1a, 2a of the three iron cores 1, 2, respectively.
Are formed. These raised portions 1b, 2b are raised at right angles from the ends of the respective deviated planes 1a, 2a so that the raised portions 1b, 2b of the iron cores 1, 2 adjacent to each other narrow the gap 6. Therefore, the iron core 1 is an I-shaped iron core having a cross section of an “I” shape, and the iron cores 2 and 2 have a modified I type (I ′) having a cross section of a “[” shape or “]” shape.
Type) Iron core.

The periphery of the iron core 1 and the coil 3 is covered with a reinforcing insulating layer 5 that electrically insulates and protects the coil 3 and has mechanical strength. The reinforcing insulating layer 5 is made of, for example, an epoxy cured resin.

In the present embodiment, the iron cores 2 and 2 are mounted on a moving body, and the coils 4 and 4 wound around the iron cores 2 and 2 are provided.
Is a power receiving, that is, a secondary coil, which is connected to a rechargeable battery of the moving body. Further, the iron core 1 is fixedly installed at a predetermined place in a moving place where the moving body moves, and the coil 3 wound around the iron core 1 is for power transmission, that is, a primary coil and is connected to a power source. . Therefore, after the moving body has moved to a predetermined place in the moving place, the core 1 is inserted between the cores 2 and 2 to perform charging.

The operation and characteristics of the power supply device shown in FIG. 1 will be described.

As shown in FIG. 1, when a current is passed from the power source to the primary coil with the iron core 1 wound with the primary coil inserted between the iron cores 2 and 2 wound with the secondary coil,
A magnetic circuit is formed on the iron cores 1 and 2 via the raised portions 1b and 2b. Therefore, an electromotive force is obtained in the secondary coil,
The rechargeable battery of the moving object is charged.

The operating frequency of this power supply device depends on the selection of the iron core material.
A high frequency of ~ several hundred kHz is desirable.

The narrower the gap formed between the raised portions 1b and 2b, the higher the power transmission efficiency.

Since the I'-type iron core 2 on the secondary power receiving side receives the magnetic flux from the I-type iron core 1 on the primary power transmission side in two parts, the cross-sectional area of the I'-type iron core 2 in a cross section perpendicular to the plane 2a, That is, the cross-sectional area of the magnetic circuit may be 断面 of the cross-sectional area of the I-shaped iron core 1 perpendicular to the plane 1a.

The power supply apparatus shown in FIG. 1 has an I / I'-type iron core structure in which an I-type iron core 1 and an I'-type iron core 2 formed in a flat shape are combined. However, there is an advantage that the portion around which the coil is wound can be lengthened. Therefore, the number of turns of the coil can be increased, and when the number of turns of the coil is large, a high-voltage small-current method can be adopted. In general, in transmitting constant power, it is known that a high-voltage small-current method has good transmission efficiency, and it can be said that this is a desirable core structure also from this point.

In general, in a method of winding a coil along an uneven plane, cooling of an iron core is easy. Since the power supply device of FIG. 1 also employs a method in which a coil is wound along an uneven plane, cooling of the iron core is easy.

In the structure of the iron core of the power supply device shown in FIG. 1, the air gap 6 is smaller than the total magnetic path length of the magnetic circuit, and the small void ratio is also effective in improving the power transmission efficiency.

In order to reduce the equivalent magnetic resistance in the air gap 6, the cross-sectional area (thickness × depth) of the magnetic circuit at the raised portions 1b and 2b should be larger than the cross-sectional area of the magnetic circuit at the uneven planes 1a and 2a. Can be.

As described above, the present invention is superior to a conventional power supply method using electromagnetic induction.

Further, the present invention is suitable for charging a battery mounted on a moving object, for example, a robot, an electric vehicle or the like. There is no danger of leakage due to inadvertent contact, as compared to the conventional method in which a charging electrode is attached to the moving body and this charging electrode contacts the power source side electrode to supply power. Excellent durability without electrode evaporation and electrode wear. In addition, since there is no evaporation or wear of the electrodes, it is possible to maintain a high degree of cleanness in the room where the moving body moves.

In the above embodiment, the iron cores 2 and 2 wound with the secondary coil are mounted on the moving body, and the iron core 1 wound with the primary coil is fixedly installed. May be mounted on a moving body, and the cores 2 and 2 wound with the primary coil may be fixedly installed.

[0027]

The present invention exhibits the following excellent effects.

(1) Power can be supplied to a moving body without contact.

(2) A high-voltage, small-current system is realized by the I / I 'type iron core structure, and the transmission efficiency is good.

(3) Since the air gap is smaller than the total magnetic path length, the transmission efficiency is good.

(4) Since the coil is wound along the uneven plane, the cooling of the iron core is easy.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a power supply device according to an embodiment of the present invention.

FIG. 2 is a perspective view of the power supply device of FIG.

FIG. 3 is a cross-sectional view of a conventional power supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron core (I type iron core) 1a Unbalanced surface 1b Raised part 2 Iron core (I 'type iron core) 2a Unbalanced surface 2b Raised part 3 Coil (primary side coil) 4 Coil (secondary side coil)

Claims (3)

[Claims] A flat iron core is disposed so that its respective flat surfaces face each other, and a coil is wound around each of the two iron cores so that the two iron cores can be inserted between the two iron cores. Wind another coil around the iron core, insert this core between the two iron cores,
A non-contact power supply method, wherein power is supplied from one coil to the other coil in a non-contact manner. 2. The semiconductor device according to claim 1, wherein said three iron cores are provided with ridges at ends of said mutually facing deflected planes, and a magnetic circuit is formed through said ridges when power is supplied. 2. The non-contact power supply method according to 1. 3. The method according to claim 1, wherein any one of the iron cores is mounted on a moving body.
The coil wound around the core is connected to a rechargeable battery of the moving body, the iron core wound around the another coil is fixedly installed in a moving field where the moving body moves, and the other coil is connected to a power source. The non-contact power supply method according to claim 1 or 2, wherein: