JPH07245164A - Current feeding device for relatively rotating part - Google Patents

Abstract

PURPOSE:To provide a current feeding device which does not incorporate any brushes by constituting two magnetic circuits and two electric circuits between input and output terminals from a conductive and a nonconductive magnetic fluid which are put fully in two ring-shaped magnetic circuits composed of a magnetic ring and a slipping. CONSTITUTION:A magnetic ring 7 having a U-section made of a conductive magnetic material is fixed inside an accommodation case 3. At the opening of this ring 7, a slipping 5 made of a conductive magnetic material is fixed to the periphery of a hollow rotary shaft 1. The gap between the ring 7 and the periphery of the slipping 5 is filled with a conductive magnetic fluid 9, while the gap between the opening of the ring 7 and the inside circumference of the slipping 5 is filled with a nonconductive magnetic fluid 8. Thereby two ring-shaped magnetic circuits are formed from the ring 7, slipping 5, and magnetic fluids 8, 9, and these fluids are held in the respective gaps. Between the input terminal 4 and the output terminal 6, an electric circuit is formed where the ring 7, slipping 5, and conductive magnetic fluid 9 are interposed.

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-based material with excellent conductivity is used for slip ring and commutator, and carbon-based material with excellent conductivity and wear resistance for 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 to the inspection and maintenance of 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 a 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. And a ring-shaped storage case 3 having a U-shaped cross section and made of a non-conductive non-magnetic material and a conductive member fixedly provided inside the storage case 3 so that the opening is on the side of the hollow rotating shaft 1. Magnetic ring 7 made of a conductive magnetic material and having a U-shaped cross section, and a slip ring having a rectangular cross section made of a conductive magnetic material fixed to the hollow rotating shaft 1 while holding an appropriate gap between the opening and the central portion of the magnetic ring 7. 5, the gap between the opening of the magnetic ring 7 and the slip ring 5 is filled with the non-conductive magnetic fluid 8, and the gap between the outer periphery of the slip ring 5 and the magnetic ring 7 is filled with the conductive magnetic fluid 9. It was done.

When the magnetic ring 7 and the slip ring 5 are made of a normal non-conductive magnetic material, the storage case 3
And the input / output terminal 4 is provided on the upper part of the housing case 3 via the conductor 11 penetrating the magnetic ring 7, and a conductive ring is provided in the middle of the rings made of two non-conductive magnetic materials that form the slip ring 5. By sandwiching the ring 12, the electrical resistance from the input / output terminals 4 to 6 is reduced.

[0006]

The N-pole and the S-pole at the opening of the magnetic ring 7 are
It is opposed to the S-pole surface and the N-pole surface of the inner peripheral portion of the slip ring 5, and the polarity of the outer peripheral portion of the slip ring 5 is the same as that of the abutting portion of the two U-shaped cross-section rings that form the magnetic ring 7. It is the opposite of the polarity. Therefore, the magnetic ring 7
Since the magnetic fluids 8 and 9 are present in the two annular magnetic circuits constituted by the slip rings 5, the magnetic fluids 8 and 9 are retained in the voids by the magnetic field in this magnetic circuit. An electric circuit from the input / output terminals 4 to 6 is also formed via the magnetic ring 7, the magnetic fluid 9 and the slip ring 5.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view of a current-carrying device according to the present invention, which has a cross-sectional shape symmetrical with respect to the hollow rotary shaft 1, 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 U-shaped member made of a non-conductive non-magnetic material (for example, plastics) is provided around a hollow rotary shaft 1 connected to a rotary shaft of a device having a rotary unit via a bearing 2. A ring-shaped storage case 3 having a mold cross section is fixed, and an input / output terminal 4 having a conductor penetrating the storage case 3 is provided on the storage case 3. A magnetic ring 7 made of a conductive magnetic material and having a U-shaped cross section is closely attached and fixed to the inside of the storage ring 3, and the opening of the magnetic ring 7 is provided on the hollow rotary shaft 1 side. .
The magnetic ring 7 constitutes a ring having a U-shaped section in which the openings are magnetized in opposite directions by abutting two rings having U-shaped sections in which the openings are magnetized in opposite polarities. Further, a slip ring 5 made of a conductive magnetic material and having a rectangular cross section is provided in the opening of the magnetic ring 7 so as to maintain an appropriate gap with the opening of the magnetic ring 7 and through a through hole provided in the center of the ring. It is fixedly provided on the periphery of the hollow rotary shaft 1. The slip ring 5 is composed of two rings whose outer and inner peripheral portions are magnetized to have opposite polarities and are closely attached to each other so that their polarities are opposite to each other. The polarity of the inner peripheral portion of the opposing slip ring 5 is magnetized opposite to the polarity of the opening portion of the magnetic ring 7, and the slip ring 5
The polarity of the outer periphery of the magnetic pole 7 is opposite to the polarity of the ends of the two butted U-shaped cross sections of the magnetic ring 7. The space between the magnetic ring 7 and the outer circumference of the slip ring 5 is filled with the conductive magnetic fluid 9, and the space between the opening of the magnetic ring 7 and the inner circumference of the slip ring 5 is non-conductive. The magnetic fluid 8 is filled. Therefore, two annular magnetic circuits are formed by the magnetic ring 7, the slip ring 5, which is a conductive magnetic material, and the magnetic fluids 8 and 9, so that the magnetic fluids 8 and 9 are held in the respective gaps. . Further, input / output terminals 4 provided on the upper part of the storage case 3 via a conductor penetrating the storage case 3
And the input / output terminal 6 provided at the fixed portion of the slip ring 5 connected to the conductor penetrating the hollow rotary shaft 1, the magnetic ring 7 and the slip ring 5, which are conductive magnetic materials, and the conductive magnetic fluid 9. An electric circuit is formed via. Therefore, the energizing device according to the present invention can transfer electric energy between the rotating part and the fixed part without using a brush.

The magnetic circuit in FIG. 1 is composed of a magnetic ring 7 and a slip ring 5, and the electric circuit is mainly composed of the slip ring 5. The embodiment in which the magnetic circuit and the electric circuit are the same is the embodiment shown in FIG. 3, and the configurations of the magnetic ring 7 and the slip ring 5 are both simple, and the openings of the magnetic ring 7 and the gap of the slip ring 5 are filled. The magnetic fluid 10 is electrically conductive.

The above-described energizing device corresponds to a pair of input / output terminals. In order to support a plurality of pairs of input / output terminals, a common storage case having a plurality of U-shaped cross-section storage portions is fixed to the hollow rotary shaft, and one U-shaped cross-section storage portion is provided for each. It suffices if the energizing device including a pair of magnetic ring and slip ring is housed, as shown in FIG.

Both the slip ring 5 and the magnetic ring 7 having a U-shaped cross section in FIG. 1 are conductive magnetic materials, and form an annular magnetic circuit and an electric circuit via a conductive magnetic fluid 9 and a non-conductive magnetic fluid 8. I am configuring. If it is difficult to form the slip ring 5 and the magnetic ring 7 with a magnetic material having excellent conductivity, there is a risk of causing trouble by energizing the magnetic material.
It is necessary to separately provide electric circuits for the output terminals 4 to 6, as shown in FIG.

In FIG. 2, input / output terminals 4 provided on the upper part of the storage case 3 are connected to a magnetic ring 7 and a conductor 11 penetrating the storage case 3. The slip ring 5 is made of a non-conductive magnetic material magnetized with opposite polarities 2
A conductive ring 12 is sandwiched between two rings, and the magnetic ring 7 is also a non-conductive magnetic material. Since the input / output terminal 6 connected to the conductor penetrating the hollow rotary shaft 1 is connected to the conductive ring 12 forming the slip ring 5, the input / output terminal 4 to the storage case 3 and the magnetic ring 7 are connected. An electric circuit is formed by the penetrating conductor 11 to the conductive magnetic fluid 9 to the conductive ring 12 to the input / output terminal 6. Further, the magnetic ring 7 and the slip ring 5 which are non-conductive magnetic materials form two annular magnetic circuits via the magnetic fluids 8 and 9. That is, a current-carrying device that does not require a brush can be formed by the non-conductive magnetic material.

[0013]

As described above, the current-carrying device in the relative rotating part according to the present invention is made of a conductive magnetic material U.
The magnetic ring 7 and the slip ring 5 having a V-shaped cross section, the conductive magnetic fluid 9 filled in the gaps in the outer peripheral portions of the magnetic ring 7 and the slip ring 5, the opening of the magnetic ring 7 and the inner peripheral portion of the slip ring 5 are formed. The non-conducting magnetic fluid 8 filled in the void constitutes an electric circuit between the two annular magnetic circuits and the two input / output terminals. When the magnetic ring 7 and the slip ring 5 are made of a non-conductive magnetic material, the conductor 11 penetrating the storage case 3 and the magnetic ring 7 is connected to the input / output terminal 4 so that the slip ring 5 is electrically conductive. An electric circuit was constructed by sandwiching the ring 12 and connecting the conductive ring 12 to the input / output terminal 6.
Therefore, since the brush is not present in the current-carrying device in the relative rotating part according to the present invention, the power-carrying device can be realized in which the loss due to the transfer of electric energy is small, and the inspection and maintenance can be easily performed without noise generation.

[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.

FIG. 3 is a partial cross-sectional view showing a third embodiment according to the present invention.

[Explanation of symbols]

 1 Hollow rotating shaft 3 Ring-shaped storage case 4,6 Input / output terminal 5 Slip ring 7 Magnetic ring 8,9,10 Magnetic fluid 12 Conductive ring

Claims (3)

[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. U made of non-conductive non-magnetic material
A ring-shaped storage case (3) with a U-shaped cross section, and a magnetic ring with a U-shaped cross section made of a conductive magnetic material fixed inside the storage case (3) so that the opening is on the side of the hollow rotating shaft (1). (7) and the slip ring (5) of rectangular cross section made of a conductive magnetic material fixed to the peripheral part of the hollow rotating shaft (1) with an appropriate gap and the opening and center of the magnetic ring (7). A non-conductive magnetic fluid (8) filled in the space between the opening of the magnetic ring (7) and the slip ring (5), the central part of the magnetic ring (7) and the outer peripheral part of the slip ring (5). A ring-shaped magnetic circuit is formed by the magnetic ring (7) and the slip ring (5) through the conductive magnetic fluid (9) filled in the void of the magnetic ring (7) to the conductive magnetic fluid (9). ) ~ Via slip ring (5) Storage case (3) and energizing apparatus in the relative rotation part, characterized in that the formed electric circuit between the hollow rotary shaft (1). 2. A magnetic ring (7) having a U-shaped cross section made of a non-conductive magnetic material, and a non-conductive magnetic material having a conductive ring (12) interposed in the center of the ring having a rectangular cross section. Between the slip ring (5), the storage case (3) and the conductor penetrating the magnetic ring (7) and the conductor connected to the conductive ring (12), between the storage case (3) and the hollow rotating shaft (1). The electric device in the relative rotating unit according to claim 1, wherein the electric circuit is formed. 3. A conductive magnetic fluid (10) is used to fill a gap between the opening of the magnetic ring (7) made of a conductive magnetic material and the slip ring (5) made of a conductive magnetic material. 2. The current-carrying device in the relative rotating part according to claim 1, wherein a magnetic circuit and an electric circuit composed of a magnetic ring (7) and a slip ring (5) are formed via a fluid (10).