JP3837834B2 - Non-contact power feeding device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a non-contact power feeding device, and more particularly to a non-contact power feeding device that can improve power transmission efficiency in a non-contact power feeding device for feeding power in a non-contact manner to an inter-process transfer device or the like. It is.
[0002]
[Prior art]
As shown in FIG. 3 , the non-contact power supply device P0 includes, for example, a power supply line 54 in which an alternating current is supplied from a high-frequency power source 53 to a moving body 52 of an interprocess transfer device that moves on a rail 51 laid on a predetermined path. From the power receiving unit 55, the power is supplied. Here, FIG. 4 is a diagram showing a detailed structure of the power receiving unit 55 .
As shown in FIG. 4 , the power receiving unit 55 receives power from the power supply line 54 by interlinking with the magnetic flux generated around the power supply line 54 that is a reciprocating parallel line fixed to the side wall 51 a of the rail 51. An E-shaped magnetic core having a coil 56, a central core 57 around which the power receiving coil 56 is wound, and a peripheral core 58 provided outside the central core 57 is provided.
[0003]
In the non-contact power feeding device P0 including the power receiving unit 55, when an alternating current is passed through the power supply line 54 from the high frequency power supply 53 (see FIG. 3 ), a magnetic field is generated around the power supply line 54, and the power receiving coil 56 An electromotive force is induced at both ends. This electromotive force is converted into a constant DC voltage by a constant voltage circuit, for example, and supplied to an inverter (not shown) or the like provided in the moving body 52 so that the moving body 52 can move.
Further, the magnetic coupling between the power supply line 54 and the power receiving coil 56 is strengthened by the central core 57 and the peripheral core 58 provided in the power receiving unit 55. Here, FIG. 5 is a diagram showing the distribution of magnetic flux generated around the feeder line 54.
[0004]
As shown in FIG. 5 , the central core 57 is a magnetic body such as iron that reduces leakage of magnetic flux formed inside the power receiving coil 56. Further, the peripheral core 58 is provided integrally with the central core 57, and together with the central core 57, a magnetic path is formed around the power supply line 54 by a magnetic material, and is generated in the power receiving coil 56 around the power supply line 54. The magnetic flux is interlinked as effectively as possible. Naturally, if the magnetic flux effectively linked to the power receiving coil 56 is increased, the induced electromotive force generated at both ends of the power receiving coil 56 is also increased, so that the power transmission efficiency is improved. The other end of the peripheral core 58 is the center so that the movement of the power supply line 54 in the direction of the arrow M is not hindered, that is, the power supply line 54 can enter and exit from the opening K between the power receiving coil 56 and the peripheral core 58. The structure is not connected to the core 57.
As described above, in the non-contact power feeding device, magnetic flux leakage is reduced by providing a magnetic core around the power receiving coil 56, thereby improving power transmission efficiency.
[0005]
[Problems to be solved by the invention]
By the way, the efficiency of the above-mentioned device is lowered even when the current loss in the feeder line 54 is large. Since the length of the feeder line 54 is determined by the moving range of the moving body 52, in order to reduce the current loss, a metal material having good conductivity is used for the feeder line 54, or the sectional area of the feeder line 54 is used. Need to be larger. However, a metal material with good conductivity is generally expensive.
On the other hand, the opening K between the central core 57 and the peripheral core 58 requires a width W larger than the thickness of the feeder line 54 in consideration of free entry and exit of the feeder line 54. Therefore, if the cross-sectional area of the feeder line 54 is increased in order to reduce the current loss, the width W needs to be increased, and the magnetic path in the air becomes longer. When the magnetic path in the air becomes longer, as shown in FIG. 5 , the magnetic flux in the opening K is disturbed, and the magnetic flux effectively linked to the power receiving coil 56 is reduced. Consequently, the power transmission efficiency in the entire apparatus is not improved. . That is, in the conventional non-contact power supply device, the magnetic coupling force between the power supply line 54 and the power receiving coil 56 and the thickness of the power supply line 54 are in a trade-off relationship, and it is difficult to improve the power transmission efficiency. It was.
In order to solve the problems in the conventional technology, the present invention improves the non-contact power feeding device and arranges feeding lines outside the central core and the peripheral core to improve the power transmission efficiency compared with the conventional technology. An object of the present invention is to provide a non-contact power feeding device that can perform the above.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a non-contact power supply apparatus that supplies power from a primary power supply line to a load that moves in a non-contact manner along a primary power supply line that is a round-trip line through which an alternating current flows. A secondary coil that is provided on the load side and interlinks with the magnetic flux generated around the primary power supply line, and a magnetic core having an E-shaped cross section around which the secondary coil is wound around the center leg. In the non-contact power feeding device provided, the concave portion of the magnetic core is formed flat and the secondary coil is inserted into the concave portion, and the primary feeding line is disposed outside the concave portion of the magnetic core. secondary coil opposite to the arrangement cross-section E shape second formed magnetic core is formed in a flat recess having the same shape are disposed so as to be in close contact with the recess Rutotomoni, the primary paper The width of the electric wire and the winding width of the secondary coil are substantially the same. And it is configured as a non-contact power feeding device, wherein the door. In the non-contact power feeding device, since the secondary coil is inserted into the flat magnetic core recess and disposed opposite the primary power feeding line, the magnetic flux of the primary power feeding line is effective for the secondary coil. The transmission power efficiency can be improved. Furthermore, since the winding width of the secondary coil is substantially the same as the flat primary feeding line, the winding width of the secondary coil can be set larger than the gap between the primary feeding line and the secondary coil. A change in transmission power efficiency due to a change in the position of the primary feeder can be suppressed. In addition, since the primary feed line is disposed outside the magnetic core, the cross-sectional area of the primary feed line can be increased and current loss in the primary feed line can be reduced .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention. Here, FIG. 1 is a diagram showing a schematic configuration of a non-contact power feeding device according to an embodiment of the present invention, and FIG. 2 is a diagram showing a magnetic flux distribution in the non-contact power feeding device.
As shown in FIG. 1, the non-contact power feeding device 0 according to the present embodiment interlinks with a magnetic flux generated around a primary power feeding line 1 which is a reciprocating parallel line fixed to a rail side wall 51a, for example. A magnetic material having an E-shaped cross section having a secondary coil 2 that receives power from the secondary feeder 1, a central core (corresponding to a central leg) 3 around which the secondary coil 2 is wound, and a peripheral core 4 provided outside the central core 3 It is the same as the prior art in that it has a body core.
[0008]
On the other hand, in the non-contact power feeding device 0, unlike the prior art, the concave portion of the magnetic core is formed flat and the secondary coil 2 is inserted into the concave portion, and the primary feeder 1 is connected to the magnetic body. The core is arranged outside the concave portion formed by the central core 3 and the peripheral core 4 so as to face the secondary coil 2, and the width of the primary feeder 1 and the winding width of the secondary coil 2 are set to be substantially the same. The
In the non-contact power feeding device 0 as described above, the end surface 3a of the central core 3 and the core are placed on a predetermined plane F0 facing the primary feeding line 1 or on a plane close to the plane and substantially parallel to the plane. 4 end face 4a is arranged, and it is not necessary to enter and exit the power supply line to / from the core as in the conventional device, and the gap between the magnetic core and the magnetic core can be reduced. The coil width a of the secondary coil 2 located between the end face 4a of the end surface 3a and the peripheral core 4 of the center core 3, than the gap b between the primary feed line 1 and the predetermined plane F 0 It is set long. That is, the concave portion of the magnetic core composed of the secondary coil 2, the central core 3, and the peripheral core 4 is provided flat.
Further, the non-contact power feeding device 0 includes feeding line side cores 5 and 6 for converging the magnetic flux formed between the primary feeding lines 1 as shown in FIG. 1 and FIG. 3 and the end face 5a of the feeder line side core 5 and the end face 6a of the feeder line side core 6 are disposed on a plane F1 facing the peripheral core 4 or close to the plane F1 and substantially parallel to the plane F1. This is different from the conventional technology. As shown in FIGS. 1 and 2, the feeder line side cores 5 and 6 are formed in an E-shaped cross section, and the primary feeder line 1 is formed on the feeder line side cores 5 and 6. It is formed in the same shape as the recess. The primary power supply line 1 is arranged so as to be in close contact with the recesses of the power supply line side cores 5 and 6. Here, the feeder line side cores 5 and 6 correspond to a second magnetic core.
[0009]
Hereinafter, the details of the non-contact power feeding device 0 will be described with reference to FIG. Here, FIG. 2 is a diagram showing the magnetic flux distribution of the non-contact power feeding device 0. In FIG.
In the non-contact power feeding device 0, in order to further strengthen the magnetic coupling between the primary power feeding line 1 and the secondary coil 2, the length of the central core 3 in the plane F0 direction and the length of the peripheral core 4 in the plane F0 direction The length in the plane F1 direction of the feeder line side core 5 and the length in the plane F1 direction of the feeder line side core 6 are provided at substantially the same lengths c and e, respectively. In addition, the length of the primary feeder 1 in the plane F1 direction is also set to a length a that is substantially the same as the length of the secondary coil 2 in the plane F0 direction.
Furthermore, in the non-contact power feeding device 0, the tooth height h of the magnetic core is set smaller than the magnetic core width a . That is , since the concave portion of the magnetic core is provided flat, a magnetic flux distribution as shown in FIG. As shown in this magnetic flux distribution, the length cw of the magnetic path passing through the air is smaller than the length cw of the magnetic path passing through the magnetic core (see FIG. 2B). The larger the width a, the smaller the ratio aw / cw between the length cw of the magnetic path passing through the magnetic core and the length aw of the magnetic path passing through the air. This means that even if the secondary coil 2 side moves slightly in the direction of the arrow M, the magnetic flux effectively linked to the secondary coil 2 hardly changes. Therefore, the power transmission efficiency is less affected by the shaking of the moving body 52.
[0010]
In addition, the cross-sectional area of the primary feeder 1 can be increased by this configuration. This is the primary feed line 1, because they are located in the secondary coil 2 and opposed faces, also a magnetic path passing through the air by increasing the conventional primary cross-sectional area of the feed line 1 as increasing This is because there is no trade-off relationship. Therefore, if the cross-sectional area of the primary feed line 1 is increased while maintaining the relationship facing the secondary coil 2, the current loss in the primary feed line 1 is reduced and the efficiency of the apparatus is improved.
Thus, in the non-contact power feeding device 0 according to the present embodiment, it is not necessary to enter and exit the power feeding line as in the conventional device, so that the gap between the primary power feeding line 1 and the magnetic core is made narrower than before. Can do. Further, the efficiency of the apparatus can be improved by increasing the cross-sectional area of the primary feeder 1 .
[001 1 ]
【The invention's effect】
As described above, the present invention is a contactless power feeding device that feeds power from the primary power feed line to a load that moves in a non-contact manner along a primary power feed line that is a round trip line through which an alternating current flows. A secondary coil interlinked with the magnetic flux generated around the primary power supply line, and a magnetic core having an E-shaped cross section around which the secondary coil is wound around the central leg. In the non-contact power feeding device, the concave portion of the magnetic core is formed flat and the secondary coil is inserted into the concave portion, and the primary feeding line is connected to the secondary coil outside the concave portion of the magnetic core. opposite of the deployed section E shape second magnetic core to be formed into a flat recess of the same shape formed is disposed so as to be in close contact with the recess Rutotomoni, the width of the primary feed line The winding width of the secondary coil is substantially the same. And it is configured as a non-contact power feeding device. In the non-contact power feeding device, since the secondary coil is inserted into the flat magnetic core recess and disposed opposite the primary power feeding line, the magnetic flux of the primary power feeding line is effective for the secondary coil. The transmission power efficiency can be improved. Further, since the winding width of the secondary coil is substantially the same as the flat primary feeding line, it is possible to set the winding width of the secondary coil larger than the gap between the primary feeding line and the secondary coil. A change in transmission power efficiency due to a change in the position of the primary feeder can be suppressed. In addition, since the primary feed line is disposed outside the magnetic core, the cross-sectional area of the primary feed line can be increased and current loss in the primary feed line can be reduced .
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a non-contact power feeding device 0 according to an embodiment of the present invention.
FIG. 2 is a view showing a magnetic flux distribution of the non-contact power feeding device 0.
FIG. 3 is a diagram for explaining a state of a conventional non-contact power feeding device and a moving body.
FIG. 4 is a diagram showing a schematic configuration of a conventional non-contact power feeding device.
FIG. 5 is a diagram for explaining magnetic flux distribution of a conventional non-contact power feeding device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Primary feed line 2 ... Secondary coil 3 ... Central core 4 ... Peripheral core 5,6 ... Feed line side core

Claims (1)

A non-contact power feeding device that feeds power from the primary power feeding line to a load that moves in a non-contact manner along a primary power feeding line that is a round-trip line through which an alternating current flows,
A secondary coil provided on the load side and interlinked with the magnetic flux generated around the primary power supply line;
In the non-contact power feeding device, wherein the secondary coil includes a magnetic core having an E-shaped cross section wound around the center leg thereof.
A concave portion of the magnetic core is formed flat, and the secondary coil is inserted into the concave portion;
The primary power supply line is formed in the same shape as a flat concave portion formed in a second magnetic core having an E-shaped cross section disposed opposite to the secondary coil on the outer side of the concave portion of the magnetic core. non-contact power feeding device, wherein the Rutotomoni is disposed so as to be in close contact with the recess, and the winding width of the aforementioned secondary coil of the primary feed line is substantially the same.

Images