JPH09284907A - Non-contact transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device which transmits electric power or signals which non-contact and which hardly has a difference in induced power according to the location and has only a little damage on coils. SOLUTION: A non-contact transmission device has loop-like primary coils fastened to a base 21 and secondary coils 10 fastened to a table 1 which is so located as to face the base 21 with a space being formed between them. In this device, each of the primary coils 51 is wound round a non-magnetic winding frame 5 which has a square-shaped side face with a long hole 7L being formed in the center and an H-shaped cross section which has a loop-like groove 8 for burying the primary coil 51 and cores 9, each of which is constituted of a C-shaped core 91 and an I-shaped core 92, forms a closed magnetic path. Each of the secondary coils 10 is wound round the I-shaped core 92 and non- magnetic core installation stands 11, each of which has a groove for installing the side face of the secondary coil 10, are installed between the table 1 and the I-shaped cores 92. When the primary coils 51 are excited by AC current, current is induced in the secondary coils 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for contactlessly transmitting electric power or signals to a moving body such as a self-propelled carriage.

[0002]

2. Description of the Related Art As a conventional technique, a loop-shaped primary coil is laid in a duct along a guide rail as a contactless power feeding device for a self-propelled vehicle, and a high-frequency resonant inverter is connected to the primary coil. 1 core with a secondary coil
There is one in which the secondary coil is mounted vertically to the guide rail so as to be in the center of the secondary coil, and the primary coil is energized to generate an induced current in the secondary coil to supply power to the vehicle body (for example,
JP-A-5-207604).

[0003]

However, in the prior art, since the primary coil and the secondary coil are laid separately in parallel, the parallelism and the straightness must be sufficient. The relative position of the primary coil and the secondary coil varies depending on the traveling position, and a difference in induced current occurs. Further, there is a risk of electric leakage due to contact between the coil and the core. Therefore, an object of the present invention is to provide a contactless transmission device in which a difference in induced current hardly occurs depending on a traveling position and a coil is less likely to be damaged.

[0004]

In order to solve the above-mentioned problems, a loop-shaped primary coil fixed to a base and a secondary coil wound around a core fixed to a moving table facing each other through a gap are provided. In the provided non-contact transmission device, the side shape is a square-shape with an elongated hole in the center in the longitudinal direction,
The H-shaped non-magnetic winding frame having a loop-shaped groove for embedding the primary coil on the outer periphery is provided, and the primary coil is embedded in the groove of the winding frame and wound. The core is a closed magnetic circuit composed of a C-shaped core and an I-shaped core wound with a secondary coil. The C-shaped core is provided between the table and the I-shaped core with the upper side of the square shape of the winding frame sandwiched therebetween. And a non-magnetic core mounting base provided with a groove for accommodating the side surface of the secondary coil. Also,
Two sets of the above devices are provided in parallel, one for power transmission and the other for signal transmission.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In a contactless transmission device having a loop-shaped primary coil fixed to a base and a secondary coil wound around a core fixed to a moving table, which faces each other with a gap, A non-magnetic winding frame having an H-shaped cross-sectional shape with an elongated hole provided at the center in the longitudinal direction and a loop-shaped groove on the outer periphery is provided, and the primary coil is the winding frame. Is embedded in the groove and wound, and the core is a closed magnetic path composed of a C-shaped core and an I-shaped core wound with the secondary coil, and the C-shaped core of the winding frame. A non-magnetic core mounting base is provided which sandwiches the upper side of the square shape and which has a groove for accommodating the side surface of the secondary coil between the table and the I-shaped core. Further, two sets of the above devices are provided in parallel, one for power transmission and the other for signal transmission.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In this example, power transmission and signal transmission are provided together. FIG. 1 is a sectional view showing an embodiment, and FIG. 2 is a perspective view thereof. A pair of plain bearings 2 are provided on both wings of the T-shaped table 1. A ball nut N is provided on the leg of the table 1. A ball screw BS is fitted on the ball nut N. The sliding bearing 2 is the table 1
Are slid on a pair of bar-shaped non-magnetic guides 3 provided in parallel with the traveling direction of. Non-magnetic spacers 4 are provided at both ends of the lower surface of the guide 3.
A non-magnetic winding frame 5 is provided on the lower surface of the spacer 4. As a result, a long hole 7U in the longitudinal direction is formed between the winding frame 5 and the guide 3. The winding frame 5 has a side surface formed by cutting out an elongated hole 7L at the center in the longitudinal direction to form a square shape, and has a cross-sectional shape formed in an H shape in which loop-shaped grooves 8 are provided on the outer circumferences of the upper and lower surfaces and both end surfaces. A primary coil 51 wound in a loop is embedded in the groove 8. The core 9 is a C-shaped core 91
And the I-shaped core 92 form a closed magnetic circuit. Slot 7 in reel 5
A C-shaped core 91 of the core 9 is provided in the L and the long hole 7U by sandwiching the upper side of the winding frame 5 and keeping a gap. Here, G1 is a gap between the outer edge of the upper part of the winding frame 5 and the inner wall of the upper part of the C-shaped core 91 of the core 9, and between the inner wall of the lower part of the C-shaped core 91 of the core 9 and the elongated hole 7L of the winding frame 5. When the gap is G2, G1 >>
G2, both edges of the groove 8 of the reel 5 and the C-shaped core 91 of the core 9
The short-circuit magnetic flux across the inner walls of the upper part of the is prevented. The secondary coil 10 is wound around the I-shaped core 92 of the core 9. On the back surface of the I-shaped core 92, there is provided a groove for accommodating the side surface portion of the secondary coil 10, and the non-magnetic core mounting base 11 is provided.
Is provided. The core mount 11 is fixed to the legs of the table 1. When power transmission and signal transmission are provided side by side, two sets of the above devices may be provided in parallel with each other with the ball screw BS interposed therebetween, one for power and the other for signal.
Both ends of the guide 3, the spacer 4, and the pair of winding frames 5 are fixed to an upright non-magnetic bracket 20 while maintaining vertical and horizontal parallelism with the ball screw BS. The bottom portion of the bracket 20 is fixed to a non-magnetic base 21. Base 21
By using a non-magnetic material, short-circuit magnetic flux across both edges of the winding frame 5 is prevented. The reel 5 and the base 2
A non-magnetic material may be sandwiched between the two.

The operation will be described below by taking as an example the case where power transmission and signal transmission are provided together. When a high-frequency current is supplied from the inverter to the primary coil 51 of one of the devices, the magnetic flux created by the primary coil 51 flows through the core 9, and the current is induced in the interlinking secondary coil 10. Similarly, when a high frequency current is supplied from the oscillator to the primary coil 51 of the other device, the magnetic flux created by the primary coil 51 flows through the core 12,
An electric current is induced in the secondary coil 10 that is linked. At this time, since the winding frame 5 is made of a non-magnetic material, the primary coil 51
Generates a magnetic flux around the coil similarly to the air-core coil, and most of the generated magnetic flux interlinks with the core 9. When the ball screw BS is rotated, the table 1 is supported by the core of the ball screw BS and the pair of guides 3 at three points, and moves in the longitudinal direction. At this time, the gap between the winding frame 5 and the core 9 follows the assembling accuracy of the volt screw BS and the winding frame 5.

[0008]

As described above, the present invention has the following effects. (1) Since the air gap between the winding frame and the core maintains parallelism with respect to the ball screw, it is easy to maintain the air gap value, the induced current difference hardly occurs depending on the traveling position of the table, and the winding frame and the core are separated from each other. Not likely to come into contact. (2) Since the primary coil is embedded in the groove provided in the winding frame,
Even if the reel and the secondary core come into contact with each other, the primary coil is not damaged.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an embodiment of the present invention.

[Explanation of symbols]

 1 table 2 slide bearing 3 guide 4 spacer 5 reel 51 primary coil 7U, 7L oblong hole 8 groove 9 core 91 C-shaped core 92 I-shaped core 10 secondary coil 11 core mounting base BS ball screw N ball nut

Claims (2)

[Claims] 1. A contactless transmission device comprising a loop-shaped primary coil fixed to a base and a secondary coil wound around a core fixed to a moving table, which faces each other with a gap, A non-magnetic winding frame having an H-shaped cross-section with an elongated hole at the center in the longitudinal direction and a loop-shaped groove on the outer circumference is provided, and the primary coil has a groove of the winding frame. The core is a closed magnetic circuit that is embedded in and wound, and the core is a C-shaped core and an I-shaped core around which the secondary coil is wound. A non-magnetic core mounting base provided with the upper side of the square shape sandwiched between the table and the I-shaped core, the groove mounting the side surface of the secondary coil. Transmission equipment. 2. A contactless transmission device comprising: a loop-shaped primary coil fixed to a base; and a secondary coil wound around a core fixed to a moving table, facing each other with an air gap. A non-magnetic winding frame having an H-shaped cross-section with an elongated hole at the center in the longitudinal direction and a loop-shaped groove on the outer circumference is provided, and the primary coil has a groove of the winding frame. The core is a closed magnetic circuit that is embedded and wound inside, and the core is a C-shaped core and an I-shaped core formed by winding the secondary coil. Two sets of contactless transmission devices are provided in parallel with each other with the non-magnetic core mounting base provided with the upper side of the letter shape sandwiched between the table and the I-shaped core to accommodate the side surface of the secondary coil. It is characterized in that one is for power transmission and the other is for signal transmission. Contactless transmission device.