JP2010075019A - Non-contact power supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a non-contact power supply device for reducing the effect of a magnetic flux leaked from an opening groove of a core and the effect of a magnetic flux generated around a power supply line disposed outside the core. <P>SOLUTION: A magnetic shield body 5 is formed in a substantial cylinder by a metallic magnetic material having high magnetic permeability and externally provided on the core 2 and the coil 3. As described above, he core 2 and the coil 3 are enclosed by the magnetic shield body 5, so that a magnetic flux generated around a returning power supply line 100 can be prevented from passing through the inside of the core 2. As the result, the degradation in the efficiency of power transmission of a pickup section 1 can be prevented. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a non-contact power supply apparatus that includes a pickup unit that is inductively coupled to a power supply line through which a high-frequency current flows, and that supplies power to a load by an induced electromotive force induced in the pickup unit.

  As this type of non-contact power supply device, for example, a power supply line that allows a high-frequency current to flow along a moving line of a moving body is stretched, and a pickup unit that is inductively coupled to the power supply line is disposed on the moving body. There is provided one that supplies power to a load (an electric motor that moves a moving body) by an induced electromotive force induced in the section (see Patent Documents 1 and 2).

The pickup unit has a cylindrical core surrounding the power supply line along the circumferential direction and a coil formed by winding a winding around the core, and most of the magnetic flux generated around the power supply line passes through the core. The induced electromotive force induced in the coil is increased. The core is provided with an opening groove along the axial direction of the power supply line so that at least the power supply line can pass in the radial direction so that the pickup portion can be easily attached to and detached from the power supply line. .
JP 2004-120880 A Japanese Patent No. 3263421

  By the way, since the core in the conventional example is provided with the opening groove for inserting the feeder, a part of the magnetic flux passing through the core leaks to the outside through the opening groove. And the eddy current by a leakage magnetic flux flows into the metal member (for example, moving body and moving line) arrange | positioned in the vicinity of a pick-up part, a loss arises, As a result, the efficiency of the electric power transmission of a pick-up part falls. There is a fear. Alternatively, when one of the two supply and return power supply lines to the high frequency power supply is disposed inside the core and the other power supply line is disposed in the vicinity of the pickup unit, the other power supply line The magnetic flux generated in the vicinity of the magnetic field cancels out with the magnetic flux passing through the core through the opening groove, and as a result, the power transmission efficiency of the pickup unit may be reduced. In the conventional examples described in Patent Documents 1 and 2, the shield between the coil and the moving body is magnetically shielded. However, the influence of the magnetic flux leaking from the opening groove of the core and the feeder line arranged outside the core No consideration is given to the influence of magnetic flux generated around the.

  The present invention has been made in view of the above circumstances, and an object thereof is to reduce the influence of magnetic flux leaking from the opening groove of the core and the influence of magnetic flux generated around the power supply line arranged outside the core. An object of the present invention is to provide a non-contact power feeding device that can be used.

  In order to achieve the above object, a first aspect of the present invention provides a non-contact power feeding device that includes a pickup unit that is inductively coupled to a feeder line through which a high-frequency current flows, and that feeds a load by an induced electromotive force induced in the pickup unit. The pickup unit includes a cylindrical core that surrounds the power supply line along the circumferential direction and has at least an opening groove through which the power supply line can pass in the radial direction is provided along the axial direction of the power supply line. And a magnetic shield made of a magnetic material having a high magnetic permeability and enclosing the core and the coil.

  According to the first aspect of the present invention, since the core and the coil are wrapped with the magnetic shield body made of a magnetic material having a high magnetic permeability, the influence of the magnetic flux leaking from the opening groove of the core can be reduced.

  According to a second aspect of the present invention, there is provided a non-contact power supply apparatus including a pickup unit that is inductively coupled to a power supply line through which a high-frequency current flows, and supplying a load to the load by an induced electromotive force induced in the pickup unit. The pickup unit includes a cylindrical core that surrounds the power supply line along the circumferential direction and has at least an opening groove through which the power supply line can pass in the radial direction is provided along the axial direction of the power supply line. The feed line is composed of a forward feed line that is inserted into the core and a return feed line that is disposed outside the core, and is made of a magnetic material having a high magnetic permeability. The magnetic shield body is disposed between the return feed line and the opening groove of the core.

  According to the invention of claim 2, since the magnetic shield body made of a magnetic material having a high magnetic permeability is disposed between the return feed line and the opening groove of the core, the magnetic flux generated around the return feed line Can affect the core and coil of the pickup unit.

  According to a third aspect of the present invention, in the second aspect of the present invention, the pickup section includes a second magnetic shield body made of a magnetic material having a high magnetic permeability and enclosing the core and the coil.

  According to the third aspect of the present invention, it is possible to reduce the influence of the magnetic flux generated around the return feeder line on the core and the coil of the pickup unit, and simultaneously reduce the influence of the magnetic flux leaking from the opening groove of the core.

  ADVANTAGE OF THE INVENTION According to this invention, the influence of the magnetic flux which leaks from the opening groove | channel of a core, and the influence of the magnetic flux produced around the feeder line arrange | positioned on the outer side of a core can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
The contactless power supply device of the present embodiment is inductively coupled to the power supply line 100 installed in a loop as shown in FIG. 7A, the high-frequency power source 110 that causes a high-frequency current to flow through the power supply line 100, and the power supply line 100. The pickup unit 1 supplies power to the load (an inverter and a motor for moving a moving body not shown) 111 from the pickup unit 1. Note that a moving body (not shown) on which the non-contact power feeding device of this embodiment is mounted moves along a metal moving line (rail) 200 as shown in FIG. Forward and return feeder lines 100 are arranged inside and outside the U-shaped rail 200.

  As shown in FIG. 7B, the power supply line 100 includes a cylindrical inner tube portion 101, a cylindrical outer tube portion 102 disposed outside the inner tube portion 101, an inner tube portion 101, and an outer tube portion. The connecting part 103 that connects the two parts 102 so as to be concentric with each other is formed by coating a conductor integrally formed by bending a metal plate with an insulator 104 made of a synthetic resin molded product having a rectangular tube shape. ing. That is, in the feeder line through which high-frequency current flows, there is resistance (high-frequency resistance) due to the skin effect and proximity effect in addition to the electrical resistance of the conductor material (metal plate), but the double tube shown in FIG. If a conductor having a structure is used for the feeder line 100, the high-frequency resistance can be reduced and the loss can be reduced as compared with a cylindrical conductor.

  The pickup unit 1 includes a core 2, a coil 3, a bobbin 4, a magnetic shield body 5, and a power receiving circuit unit 6. The power receiving circuit unit 6 includes a capacitor that forms a resonance circuit together with the coil 3, a constant voltage circuit that makes the resonance voltage output from the resonance circuit of the coil 3 and the capacitor constant, and the like.

  As shown in FIG. 1, the core 2 has both an inner peripheral surface and an outer peripheral surface formed of curved surfaces (cylindrical surfaces), and has a substantially C-shaped cross section that intersects the axial direction (direction perpendicular to the paper surface). Yes. Here, both end portions 20 and 20 of the core 2 facing each other across the opening groove 2a are more along the axial direction than portions (hereinafter referred to as “body portions”) 21 excluding the both end portions 20 of the core 2. The area of the cross section is large.

  The bobbin 4 is formed of a rectangular tube-shaped synthetic resin molded product that is curved in an arc shape, and outer casings 40 are provided at both ends in the axial direction. The core 2 has a body 21 divided into two parts on the opposite side of the opening groove 2a. After the bobbins 4 and 4 are extrapolated to the body 21 and 21, the ends of the body 21 and 21 are inserted. The core 2 shown in FIG. 1 is comprised by joining each other.

  The coil 3 is formed by winding a winding having an insulating coating around the bobbins 4 and 4 in a single layer. The step between the end 20 of the core 2 and the body 21 is set larger than the diameter of the winding so that the coil 3 does not protrude beyond the end 20 of the core 2. Thus, since the coil 3 does not protrude outside the end portion 20 of the core 2, magnetic flux leaking from the end portion of the coil 3 to the outside of the end portion 20 of the core 2 can be reduced.

  The magnetic shield body 5 is formed in a substantially cylindrical shape by a metal magnetic material having a high magnetic permeability, and is extrapolated to the core 2 and the coil 3. However, the magnetic shield body 5 is provided with a groove 5a communicating with the opening groove 2a of the core 2 along the axial direction.

  Thus, when a high-frequency current flows through the opening groove 2a to the feeder line 100 disposed inside the core 2, a high-frequency magnetic field (magnetic flux) is generated on a concentric circle centering on the feeder line 100, and most of the magnetic flux is the core. 2 passes along the circumferential direction. And the said magnetic flux changes according to a high frequency current, and an induced electromotive force arises in the coil 3. FIG.

  Here, in the present embodiment, as shown in FIG. 1, one (outward) feed line 100 of the two forward and return feed lines 100 to the high-frequency power supply 110 is disposed inside the core 2, and the other A (return) feeder 100 is arranged in the vicinity of the pickup unit 1. In such a case, the magnetic flux generated around the return power supply line 100 arranged outside the core 2 is reversed in direction from the magnetic flux generated around the forward power supply line 100 arranged inside the core 2. Therefore, the magnetic flux passing through the core 2 may be canceled out. However, in this embodiment, since the core 2 and the coil 3 are encased in the magnetic shield body 5, the magnetic flux generated around the return feeder 100 can be prevented from passing through the core 2, and as a result. In addition, it is possible to suppress a reduction in power transmission efficiency of the pickup unit 1.

  In addition, since the core 2 in the present embodiment is provided with the opening groove 2a for inserting the feeder 100, a part of the magnetic flux passing through the core 2 leaks to the outside through the opening groove 2a. The leakage magnetic flux causes an eddy current to flow through the rail 200 that is a conductor, resulting in a loss. As a result, the power transmission efficiency of the pickup unit 1 may be reduced.

  Therefore, as shown in FIG. 2, when the groove 5a of the magnetic shield body 5 is configured to be opened and closed by the magnetic shield cover 50, the magnetic flux passing through the opening groove 2a is shielded and generated by the leakage magnetic flux as described above. Eddy current loss can be reduced. The magnetic shield cover 50 is formed in the shape of a strip of the same material as the magnetic shield body 5, and is detachably fitted in the groove 5 a of the magnetic shield body 5. Instead of wrapping the entire core 2 and coil 3 with the magnetic shield 5, as shown in FIG. 3, a magnet that is detachably attached to both ends 20, 20 of the core 2 and closes the opening groove 2 a of the core 2. Even if the shield body 5 'is provided, the eddy current loss can be similarly reduced.

(Embodiment 2)
Since the basic configuration of the contactless power supply device of this embodiment is the same as that of the first embodiment, the same reference numerals are given to the same components as those of the first embodiment, and illustration and description thereof will be omitted as appropriate.

  As described in the first embodiment, the magnetic flux passing through the core 2 may decrease due to the influence of the magnetic flux generated around the return feeder 100 disposed outside the core 2.

  Therefore, in the present embodiment, as shown in FIG. 4, the magnetic shield body 7 made of a magnetic material having a high magnetic permeability is provided between the return feeder 100 disposed outside the core 2 and the opening groove 2 a of the core 2. Is arranged. The magnetic shield body 7 is formed in a hook shape having a substantially L-shaped cross section, and is fixed to the rail 200 at both end edges along the longitudinal direction. The feeder line returns to the space formed between the rail 200 and the magnetic shield body 7. 100 is stored.

  Thus, in the present embodiment, the magnetic shield 7 made of a magnetic material having a high magnetic permeability is disposed between the return power supply line 100 and the opening groove 2a of the core 2, so that the return power supply line 100 The influence of the magnetic flux generated around the core 2 and the coil 3 of the pickup unit 1 can be reduced. In addition, in this embodiment, the magnetic shield 7 disposed between the opening groove 2a of the core 2 and the rail 200 can reduce the magnetic flux leaking from the opening groove 2a and interlinking with the rail 200. Further, eddy current loss caused by leakage magnetic flux can be reduced. However, the shape of the magnetic shield body 7 may be flat as shown in FIG.

  Further, as shown in FIG. 6, if the core 2 and the coil 3 are wrapped with the magnetic shield body 5 in the first embodiment, the magnetic flux generated around the return feeder 100 is applied to the core 2 and the coil 3 of the pickup unit 1. The influence exerted can be further reduced. 2 and 3, when combined with the configuration in which the opening groove 2a of the coil 2 is closed by the magnetic shield cover 50 or the magnetic shield body 5 ', the eddy current loss caused by the leakage magnetic flux leaking from the opening groove 2a. Can be further reduced.

It is principal part sectional drawing of Embodiment 1 of this invention. It is another principal part sectional drawing same as the above. It is another principal part sectional drawing same as the above. It is principal part sectional drawing of Embodiment 2 of this invention. It is another principal part sectional drawing same as the above. It is another principal part sectional drawing same as the above. (A) is a whole block diagram same as the above, (b) is sectional drawing of the feeder in the same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pickup part 2 Core 2a Opening groove 3 Coil 5 Magnetic shield body 100 Feed line

Claims (3)

In a non-contact power feeding device that includes a pickup unit that is inductively coupled to a power feed line through which a high-frequency current flows, and that feeds a load by an induced electromotive force induced in the pickup unit,
The pickup unit includes a cylindrical core that surrounds the power supply line along the circumferential direction and has at least an opening groove through which the power supply line can pass in the radial direction and is provided along the axial direction of the power supply line. A non-contact power feeding device comprising a coil formed by winding and a magnetic shield body made of a magnetic material having a high magnetic permeability and enclosing the core and the coil. In a non-contact power feeding device that includes a pickup unit that is inductively coupled to a power feed line through which a high-frequency current flows, and that feeds a load by an induced electromotive force induced in the pickup unit,
The pickup unit includes a cylindrical core that surrounds the power supply line along the circumferential direction and has at least an opening groove through which the power supply line can pass in the radial direction and is provided along the axial direction of the power supply line. A coil formed by winding,
The feed line consists of a forward feed line inserted into the core and a return feed line arranged outside the core.
A non-contact power feeding device, wherein a magnetic shield body made of a magnetic material having a high magnetic permeability is disposed between a return power feeding line and a core opening groove.   3. The non-contact power feeding apparatus according to claim 2, wherein the pickup unit includes a second magnetic shield body made of a magnetic material having a high magnetic permeability and enclosing the core and the coil.

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