JP5276393B2 - Non-contact power feeding device - Google Patents

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 feeding device, for example, there is one described in Patent Document 1. Patent Document 1 discloses a power supply line that allows high-frequency current to flow along a hoistway in which an elevator car moves up and down, and a pickup unit that is inductively coupled to the power supply line is disposed in the car. Then, power is supplied to the load (the hoisting machine that moves the car) by the induced electromotive force induced in the pickup unit.

The pickup unit has an E-shaped core and a coil formed by winding a winding around the core leg of the core, and most of the magnetic flux generated around the feeder line is induced in the coil by passing through the core. The electromotive force is increased. The coil is formed by winding a winding around a bobbin covering the middle leg of the core.
JP 2002-334812 A

  By the way, in the conventional example described in Patent Document 1, since the core leg of the core has a substantially prismatic shape, it is easy to wind the winding uniformly. However, in a core having a shape in which the winding portion of the winding is curved, for example, a cylindrical core in which both of the inner peripheral surface and the outer peripheral surface are curved and the cross-sectional shape intersecting the axial direction is substantially C-shaped. Even if the windings are densely wound on the inner peripheral surface, gaps are generated between the windings on the outer peripheral surface, and the gaps vary, so that the high frequency resistance of the coil is not stabilized and the yield is increased. There is a problem of getting worse.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a non-contact power feeding device capable of stabilizing the high-frequency resistance of a coil.

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 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, a bobbin that is externally inserted into the core, and a coil that is formed by winding a winding around the bobbin. Both of the outer peripheral surfaces are curved surfaces, and the cross-sectional shape intersecting the axial direction is formed in a substantially C shape, and the bobbin has a plurality of positioning protrusions provided along the circumferential direction of the core on the outer peripheral surface. and, Na winding in the housing portion formed between the positioning protrusion adjacent is housed is, a plurality of housing portions arranged along the circumferential direction of the bobbin relative depth greater first A second portion having a relatively small depth dimension with the storage portion And housed portion is characterized Rukoto such alternately provided.

According to the first aspect of the present invention, since the winding is housed in the housing portion formed between the positioning protrusions of the bobbin, the gap between the windings on the outer peripheral surface of the bobbin becomes constant, and as a result, the high frequency of the coil The resistance can be stabilized. Furthermore, by increasing the distance between adjacent windings, the influence of the proximity effect can be reduced and the high frequency resistance can be reduced.

According to a second aspect of the present invention, in the first aspect of the invention, the bobbin is characterized in that the corner portion in contact with the winding is a curved surface.

According to the invention of claim 2 , it is possible to prevent the winding from being damaged and broken at the corner portion of the bobbin.

  According to the present invention, the high frequency resistance of the coil can be stabilized.

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

  The contactless power supply device according to the present embodiment is inductively coupled to a power supply line 100 installed in a loop shape as shown in FIG. 3A, a high-frequency power source 110 that supplies a high-frequency current to the power supply line 100, and the power supply line 100. The pickup unit 1 supplies power to the load (for example, an inverter and a motor) 111 from the pickup unit 1.

  As shown in FIG. 3B, 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, high-frequency resistance can be reduced and loss can be reduced as compared with a cylindrical conductor.

The pickup unit 1 includes a core 2, a coil 3, a bobbin 4, 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 (a), the core 2 has both an inner peripheral surface and an outer peripheral surface formed by curved surfaces (cylindrical surfaces), and the cross-sectional shape intersecting the axial direction (direction perpendicular to the paper surface) is substantially C-shaped. Is formed. 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.

As shown in FIG. 1C, the bobbin 4 is formed of a synthetic resin molded product having a rectangular tube shape that is curved in an arc shape, and outer casings 40 are provided at both end portions in the axial direction. The core 2 is an end of the barrel 21 after the barrel portion 21 at a point between the open groove 2a opposite side is divided into two parts, the bobbin 4, 4 to each of the body portions 21, 21 were extrapolated The core 2 shown in FIG. 1A is configured by joining 20 and 20 together.

  As shown in FIGS. 1 (a) and 1 (b), a plurality of plate-like positioning protrusions 41 projecting outward along the axial direction of the core 2 are provided on the outer peripheral surface of the bobbin 4 in the circumferential direction of the core 2. Along the line. Each of the plurality of positioning protrusions 41 has two sets forming the storage portion 42 in which the winding 30 of the coil 3 is stored as one set, and adjacent groups are arranged at equal intervals a.

  Moreover, the corner | angular part of the bobbin 4, ie, the boundary part of an inner peripheral surface and an outer peripheral surface, and a side surface is formed in the curved surface shape convex outward (refer FIG.1 (b)).

The coil 3 is formed by winding a winding 30 having an insulating coating around the bobbin 3 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 30 so that the coil 3 does not protrude beyond the end 20 of the core 2. .

  Thus, as in the present embodiment, in the cylindrical core 2 in which both the inner peripheral surface and the outer peripheral surface are curved surfaces and the cross-sectional shape intersecting the axial direction is substantially C-shaped, the winding is performed on the inner peripheral surface. Even if the wire 30 is densely wound, a gap is generated between the windings 30 on the outer peripheral surface. In the conventional example, since the gaps vary, there is a problem that the high frequency resistance of the coil is not stabilized and the yield is deteriorated. On the other hand, in the present embodiment, a plurality of positioning protrusions 41 are provided on the outer peripheral surface of the bobbin 4 and a space between two adjacent ones of the positioning protrusions 41, 41 is used as the storage part 42 of the winding 30. Therefore, the position of the winding 30 on the outer peripheral surface of the bobbin 4 is positioned at the position of the storage portion 42. Therefore, the gap between the windings 30 on the outer peripheral surface of the bobbin 4 is constant, and as a result, the high frequency resistance of the coil 3 can be stabilized.

  Further, in this embodiment, the corner portion in contact with the winding 30 of the bobbin 4 is formed of a curved surface, thereby preventing the winding 30 from being damaged and disconnected at the corner portion of the bobbin 4.

  Here, as the interval between the adjacent windings 30 is wider, the influence of the proximity effect can be reduced and the high frequency resistance of the coil 3 can be reduced. Therefore, as shown in FIG. 2, the plurality of storage portions 42 arranged along the circumferential direction of the bobbin 4 are divided into a first storage portion 42a having a relatively large depth dimension and a second storage section having a relatively small depth dimension. If the storage portions 42b are alternately provided, the distance b (> a) between the adjacent windings 30 can be increased. As a result, the influence of the proximity effect is reduced and the high frequency resistance of the coil 3 is reduced. Can be reduced.

1A and 1B are cross-sectional views of a pickup unit in which a part thereof is omitted, FIG. 2B is a cross-sectional view of a main part of the bobbin in the above, and FIG. It is principal part sectional drawing which shows another structure of the bobbin in the 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 4 Bobbin 30 Winding 41 Positioning protrusion 42 Storage part

Claims (2)

In 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.
The pickup unit has a cylindrical core surrounding the power supply line along the circumferential direction, a bobbin extrapolated to the core, and a coil formed by winding a winding around the bobbin.
The core is formed of a curved surface on both the inner peripheral surface and the outer peripheral surface, and the cross-sectional shape intersecting the axial direction is formed in a substantially C shape.
Bobbin has a plurality of positioning projections provided along the circumferential direction of the core to the outer peripheral surface, Ri Na winding in the housing portion formed between the positioning protrusion adjacent is housed,
The plurality of storage units arranged along the circumferential direction of the bobbin are configured such that a first storage unit having a relatively large depth dimension and a second storage unit having a relatively small depth dimension are alternately provided. The non-contact electric power feeder characterized by the above-mentioned. The contactless power supply device according to claim 1 , wherein the bobbin has a curved surface at a corner in contact with the winding .

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