JPH07245163A - Current feeding device for relatively rotating part - Google Patents

Abstract

PURPOSE:To provide a current feeding device using no brushes, with which energy loss associated with giving/receiving of electric energy is decreased and also troubles generated with the use of brushes are eliminated. CONSTITUTION:A current feeding device for a relatively rotating part is configured with a U-section, ring-shaped accommodation case 3 made of a nonconductive magnetic material furnished at the periphery of a hollow rotary shaft 1 coupled with the rotary shaft of an apparatus equipped with a rotary part, a magnetic ring 4 made of a conductive magnetic material having U- section fixed to the inside of the accommodation case 3 through a ring 7, and slip rings 5 made of a conductive magnetic material having L-section fixed to the periphery of the hollow rotary shaft 1 using a ring 9. The gap between the case 3 and slip ring 5 is filled with a nonconductive magnetic fluid 10, while the gap between the magnetic ring 4 and slip ring 5 is filled with a conductive magnetic fluid 8. An insulating material 6 transmitting magnetism is installed in the center of the U-section of the magnetic ring 4 so that it 4 is divided into two segments in electrical terms.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current-carrying device in a relative rotating part for transmitting and receiving electric energy between a rotating part and a fixed part in a device having a rotating part.

[0002]

2. Description of the Related Art Electric energy is exchanged between a rotating part and a fixed part in a device having a rotating part through a brush provided on the fixed part side and a slip ring or a commutator provided on the rotating part side. It is being appreciated. In order to reduce energy loss in this energizing device, copper alloy material with excellent conductivity is used for slip ring and commutator, and carbon material with excellent conductivity and abrasion resistance is used as brush. Is used.

[0003]

In the above-mentioned current-carrying device, not only dust is generated due to abrasion of the brush material but also sparks are generated due to poor contact, so that careful attention should be paid when inspecting and maintaining the current-carrying device. It is imperative to pay. The present invention has been made in order to solve the above-mentioned drawbacks of the current-carrying device according to the prior art, and the current-carrying device in the relative rotating part that transfers electric energy between the fixed part and the rotating part without passing through the carbon brush. It is intended to provide.

[0004]

In order to achieve the above-mentioned object, a current-carrying device in a relative rotary part according to the present invention has a hollow rotary shaft 1 connected to a rotary shaft of a device equipped with the rotary part via a bearing 2. Ring-shaped storage case 3 made of a non-conductive magnetic material having a U-shaped cross section fixedly provided, and the U-shaped cross section fixed inside the storage case 3 so that the opening is on the hollow rotary shaft 1 side. Magnetic ring 4 made of a conductive magnetic material of
A slip ring 5 made of a conductive magnetic material having two L-shaped cross-sections, which is fixed to the peripheral portion of the hollow rotating shaft 1, and a conductive magnetic fluid 8 filled in two voids of the magnetic ring 4 and the slip ring 5 are stored. Case 3 and slip ring 5 2
The non-conducting magnetic fluid 10 filled in one void is used.

[0005]

The storage case 3 made of a non-conductive magnetic material, the magnetic ring 4 having a U-shaped cross section made of a conductive magnetic material, and the slip ring 5 having an L-shaped cross section made of two conductive magnetic materials.
Since the loop-shaped magnetic circuit is constituted by the non-conductive magnetic fluid 10 filling the gap between the storage case 3 and the slip ring 5, and the conductive magnetic fluid 8 filling the gap between the magnetic ring 4 and the slip ring 5. Are held in the voids by the magnetic fields in the respective voids. Therefore, the magnetic ring 7 electrically divided into two by the two input / output terminals 11 to the insulating material 6-2 the conductive magnetic fluid in the two voids-8 the two L-shaped slip rings 5-2 the input / output The terminals 12 form two sets of electric circuits.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 are partial cross-sectional views of a current-carrying device showing two embodiments according to the present invention, which have a cross-sectional shape symmetrical with respect to a hollow rotating shaft, and therefore the lower half is omitted. It should be noted that the connecting portion between the fixed portion of the device including the rotating portion and the current-carrying device according to the present invention is also omitted.

In FIG. 1, a ring-shaped U-shaped cross-section made of a non-conductive magnetic material is formed around a hollow rotary shaft 1 connected to a rotary shaft of a device having a rotary part through a bearing 2. The storage case 3 is fixed, and U of this storage case 3 is fixed.
Both ends of the V-shaped cross section are magnetized to N pole and S pole, respectively. The magnetic ring 4 made of a conductive magnetic material having a U-shaped cross section is fixed to the inside of the storage case 3 by pressure-bonding to the inside of the storage case 3 with two rings 7 made of a non-conductive non-magnetic material (for example, ceramics). Is provided. This U
The magnetic ring 4 having a V-shaped cross section is magnetized to have opposite polarities 2
A ring having a U-shaped cross section is formed by abutting two L-shaped cross-section rings through a magnetically insulating insulating material 6 (for example, insulating paper, plastic film, etc.). In addition, a proper gap is provided between the lower surface of the opening of the magnetic ring 4 and the lower surfaces of both ends of the storage case 3 through a ring 9 made of a non-conductive non-magnetic material (for example, ceramics) to surround the hollow rotating shaft 1. The two fixed L-shaped cross-section rings constitute a slip ring 5 made of a conductive magnetic material magnetized with opposite polarities.

Non-conductive magnetic fluid 10 is filled in the lower surfaces of both ends of the storage case 3 and the two L-shaped slip rings 5, and the lower surface of the opening of the U-shaped magnetic ring 4 and the two L-shaped magnetic rings. The space of the mold slip ring 5 is filled with the conductive magnetic fluid 8. Therefore, since the storage case 3 to the two L-shaped slip rings 5 to the U-shaped magnetic ring 4 form a loop-shaped magnetic circuit via the two magnetic fluids 8 and 10, the magnetic fluid 8 in each void portion is formed. And 10 are held by the magnetic field penetrating the void. Further, since the magnetic ring 4 having a U-shaped cross section is electrically divided into two parts by the insulating material 6 that allows the magnetism to pass therethrough, the two ring members provided on the upper part of the storage case 3 having the conductor penetrating the storage case 3 are provided. Output terminal 11 to 2 divided magnetic ring 4 to 2 magnetic fluid 8 to 2 slip ring 5 having L-shaped cross section 5 to slip ring 5 provided with a conductor penetrating hollow rotary shaft 1 2
Two electrical circuits consisting of one input / output terminal 12 are formed. Therefore, the energization device according to the present invention can realize the transfer of electric energy between the two sets of input / output terminals between the rotating portion and the fixed portion without using a brush.

FIG. 2 shows a current-carrying device corresponding to four sets of input / output terminals. One storage case, two magnetic rings with a U-shaped section, and four slip rings with an L-shaped section form a loop-shaped magnetic field. Make up the circuit. Further, the electric circuit composed of the two U-shaped cross-section magnetic rings and the four L-shaped cross-section slip rings has U-shaped magnetic rings 4 ₁ and 4 _2.
Magnetically insulating material 6 ₁ and 6 ₃ and L
Input / output terminal 1 divided into four by a magnetically permeable insulating material 6 ₂ provided between the V-shaped slip rings 5 ₂ and 5 _3.
Four sets of electric energy are transferred between the input terminals 1 _{1 to} 11 ₄ and the input / output terminals 12 _{1 to} 12 ₄ .

[0010]

As described above, the energizing device in the relative rotating part according to the present invention includes the storage case 3 made of a non-conductive magnetic material and the magnetic rings 4, L having a U-shaped cross section made of a conductive magnetic material. Non-conductive magnetic fluid 10 filled in the space between the slip ring 5 having a V-shaped cross section, the storage case 3 and the slip ring 5 having an L-shaped cross section, the magnetic ring 4 having a U-shaped cross section and the slip ring 5 having an L-shaped cross section A loop-shaped magnetic circuit was formed by the conductive magnetic fluid 8 filled in the voids, and a plurality of electric circuits that exchange electric energy were formed. Therefore, there is no brush in the current-carrying device in the relative rotating part according to the present invention, and it is possible to transfer a plurality of sets of electric energy between the rotating part and the fixed part, so there is little loss due to transfer of electric energy, A current-carrying device that does not generate noise and is easy to inspect and maintain can be realized.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a first embodiment according to the present invention.

FIG. 2 is a partial sectional view showing a second embodiment according to the present invention.

[Explanation of symbols]

 1 Hollow rotating shaft 3 Ring-shaped storage case 4 Magnetic ring 5 Slip ring 6 Magnetically insulating material 8,10 Magnetic fluid 11,12 Input / output terminals

Claims (1)

[Claims] 1. A current-carrying device in a relative rotating part for transmitting and receiving electric energy between a rotating part and a fixed part, wherein a bearing (2) is provided around a hollow rotating shaft (1) connected to the rotating part. It is sandwiched between a ring-shaped storage case (3) made of a non-conductive magnetic material having a U-shaped cross section and fixed thereto and two rings (7) made of a non-conductive non-magnetic material, and the opening is a hollow rotary shaft ( A magnetic ring (4) made of a conductive magnetic material having a U-shaped cross section, which is fixed to the inside of the storage case (3) so as to be on the side 1), the lower surface of the opening of the magnetic ring (4) and the storage case (3).
2 of the L-shaped section fixed to the peripheral part of the hollow rotary shaft (1) through the ring (9) with an appropriate space between the lower surfaces of both ends of the
And a slip ring (5) made of two conductive magnetic materials, the bottom surface of the opening of the magnetic ring (4) and the slip ring (5).
The storage case (3) through the conductive magnetic fluid (8) filled in the gap between and the non-conductive magnetic fluid (10) filled in the gap between the lower surfaces of both ends of the storage case (3) and the slip ring (5). ), A magnetic ring (4), and two slip rings (5) to form a loop-shaped magnetic circuit, and further, an insulating material (6) that allows magnetism to pass through the central portion of the U-shaped cross section of the magnetic ring (4). An electric device in a relative rotating part, characterized in that an electric circuit composed of a magnetic ring (4) and two slip rings (5) is divided into two by inserting the electric ring.