JP2603255Y2 - Eddy current coupling device - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a mechanism that requires tension such as unwinding or winding operations performed in various film or fine wire processing or processing steps, and is intended for use in a rotary drive machine such as an electric motor. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eddy current coupling for transmitting a torque required to obtain a predetermined tension to a rotating device of a load, and more particularly to an eddy current coupling capable of easily and variably adjusting a transmission torque according to a purpose.

[0002]

2. Description of the Related Art A powder clutch or a hysteresis type clutch is used for tension control, but an eddy current coupling having a simple structure can be used for controlling minute tension. The conventional eddy current coupling has a structure as shown in FIGS. FIG. 6 is an upper half sectional view of a conventional eddy current coupling viewed from the side. In FIG. 6, reference numeral 2 denotes a drive side mechanism of the eddy current coupling, and a first rotary plate 3 which is a drive side rotary plate.
Are connected to the input shaft 4. Reference numeral 5 denotes a driven side mechanism of the eddy current coupling, which is a driven side rotating plate with a gap GP having a predetermined dimension axially spaced from the surface of the first rotating plate 3. Plate 6
Are connected to the output shaft 7. A plurality of permanent magnets 8 are provided on the first rotating plate 3 via a magnetic member 9.
S-poles and N-poles are alternately arranged on the rotating plate 3 toward the surface. The second rotating plate 6 is formed of a magnetic material, and a conductive flat plate 11 formed of a conductive material is mounted at a position facing the permanent magnet 8. 7 shows the surface of the first rotating plate 3 viewed in the direction of arrow AA in FIG. 6, and FIG. 8 is an enlarged sectional view of FIG. 6 developed in the direction of arrow BB. FIG.
In FIG. 8, 8N1 is a permanent magnet having an N pole facing the second rotating plate 6, 8S1 is a permanent magnet having an S pole facing the second rotating plate 6, and the plurality of permanent magnets. 8 shows a pair consisting of an N pole and an S pole. FIGS. 7 and 8 show only a pair of permanent magnets, but a plurality of permanent magnets 8 are arranged around the surface of the first rotating plate 3 as shown by 8n. According to the above-described configuration, the magnetic flux Φ generated by the pair of permanent magnets 8N1 and 8S1 causes the permanent magnet 8N1, the gap GP, and the conductive plate 1
1, magnetic part of second rotating plate 6, conductive flat plate 1
1, from the gap GP to the permanent magnet 8S1, the magnetic member 9,
Circulates with the permanent magnet 8N1. The magnetic flux Φ penetrating the conductive flat plate 11 generates an eddy current EC in the conductive flat plate 11. Therefore, when the drive side mechanism 2 is rotated in a desired direction by the rotation shaft 4, the driven side mechanism 5 is also rotated by the interaction between the magnetic flux Φ and the eddy current EC.

[0003]

According to the above-mentioned structure, the conventional eddy current coupling has no means for adjusting the transmission torque. To adjust the torque according to the application, it is necessary to use the drive side and the driven side. It is necessary to adjust the relative rotation speed of the motor. In order to change the transmission torque by the eddy current coupling itself, the permanent magnet surface of the first rotating plate or the conductor surface of the second rotating plate is cut, or the first rotating plate or the second rotating plate is cut. It is necessary to make it possible to change the gap between the first rotating plate and the second rotating plate by devising a method of fixing to each rotating shaft. Each of these means is troublesome, and there is a problem that high-precision adjustment is difficult.
An object of the present invention is to solve the above-mentioned problems and to obtain an eddy current coupling that can easily and accurately adjust a transmission torque.

In order to solve the above problems, the eddy current coupling according to the present invention comprises a magnetic member in which N-pole and S-pole permanent magnets are alternately arranged toward the surface of a circular rotating body formed of a magnetic material. A first rotating plate provided; and a second rotating plate having a conductive flat plate disposed on the surface of a circular rotating body formed of a magnetic material so as to face the permanent magnet. In an eddy current coupling formed by providing a predetermined gap between the first rotating plate and the first rotating plate, an opening having a predetermined shape formed along a circumferential direction on a permanent magnet of the first rotating plate is provided. An adjusting plate having predetermined magnetic characteristics is provided, the adjusting plate is fixed to the first rotating plate, and a bolt of a predetermined size is fixed to the opposite surface of the magnetic member on which the permanent magnet is provided, on which the permanent magnet is provided. And the magnetic part The relative position between the permanent magnet and the adjustment plate is set by moving the bolt along an arc-shaped oval provided on the first rotating plate body on which the magnet is mounted and tightening a nut to the bolt at a predetermined position. -It was configured to be fixed.

[0005]

As described above, in the eddy current coupling according to the present invention, the magnetic flux penetrating from the permanent magnet through the conductive flat plate disposed on the second rotating plate leaks to the adjusting flat plate and decreases. By rotating the relative position between the permanent magnet and the adjustment plate, the relative position between the permanent magnet and the opening provided in the adjustment plate is changed, and the leakage magnetic flux can be changed. Therefore, the magnetic flux penetrating the conductive flat plate can be arbitrarily controlled, so that the torque that can be transmitted by the eddy current coupling can be arbitrarily and appropriately set. To rotate the relative position between the permanent magnet and the adjustment plate,
The adjustment plate is fixed, and the bolt fixed to the magnetic member provided with the permanent magnet is moved along the arc-shaped ellipse provided on the first rotating plate body on which the magnetic member is mounted, and fixed by the nut. By doing so, it is possible to easily and reliably change the relative position between the permanent magnet and the opening provided in the adjustment plate.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment Next, a first embodiment of the eddy current coupling according to the present invention will be described in detail with reference to FIGS. FIG. 1 is an upper half side view of an eddy current coupling 1 according to the present invention as viewed from the side. In FIG. 1, reference numeral 2 denotes a drive side mechanism of the eddy current coupling 1, and a first rotary plate 3 which is a drive side rotary plate is coupled to an input shaft 4. Reference numeral 5 denotes a driven-side mechanism of the eddy current coupling 1, which is a driven-side rotary plate separated from the surface of the first rotary plate 3 by an axial gap GP having a predetermined dimension. A rotating plate 6 is connected to the output shaft 7. The first rotating plate 3 has a plurality of permanent magnets 8,
As will be described in detail later, the first rotating plate 3 is provided on a magnetic member 9 molded from a magnetic material attached to the first rotating plate 3. On the surface of the permanent magnet 8, an adjustment plate 10 molded of a magnetic material, which will be described in detail later, and provided with a predetermined opening is mounted. A plurality of bolts 12 are fixed to the magnetic member 9 at predetermined intervals on the back surface on which the permanent magnets 8 are mounted. An elliptical opening 13 is provided in the first rotating plate 3 at a position corresponding to the bolt 12 so as to fix the magnetic member 9. The bolt 12 is fitted into the opening 13, and a nut 14 is tightened and fixed. Thus, the magnetic member 9 having the permanent magnet 8 mounted thereon is fixed to the first rotating plate 3. The second rotating plate 6 is formed of a magnetic material, and a conductive flat plate 11 formed of a conductive material is mounted at a position facing the permanent magnet 8. FIG. 2 shows the surface of the first rotating plate 3 viewed in the direction of arrows AA in FIG. In FIG. 2, 8N1 is a permanent magnet having an N pole on the surface facing the second rotating plate 6, and 8S1 is a permanent magnet having an S pole facing the second rotating plate 6. Although only one pair of permanent magnets is shown in FIG. 2, a plurality of permanent magnets 8 are arranged so as to surround the surface of the first rotating plate 3 in a circumferential shape as shown by 8n. The surface of the permanent magnet 8 is formed into a predetermined shape and thickness by a magnetic material, a predetermined number of openings 10a having a predetermined shape and dimensions are provided, and a predetermined number of fixing protrusions 10b are provided in a peripheral portion. The adjustment plate 10 is fixed to the first rotating plate 3 by bolts 10c.

Next, the operation of the eddy current coupling 1 in the above structure will be described with reference to FIG. FIG. 3 is an enlarged cross-sectional view of FIG.
On the magnetic member 9 mounted on the first rotating plate 3,
A surface facing the second rotating plate 6 is a permanent magnet 8 having N poles.
N1 and a permanent magnet 8S1 having a surface facing the second rotating plate 6 having an S pole are provided in a pair, and the adjusting plate 10 is fixed to the surface of the permanent magnet of the pair as described above. A second rotating plate 6 having a predetermined axial gap GP provided on the surface of the adjustment plate 10 and a conductive plate 11 mounted on the surface thereof is configured. Therefore, a pair of permanent magnets 8N
All the magnetic fluxes に よ る due to 1 and 8S1 pass through the magnetic member 9, but are adjusted by the adjusting plate 10 to leak magnetic flux Ф1 flowing through the adjusting plate 10 and from the gap GP to the second rotating plate 6 and the conductive plate 1 again.
1 and the magnetic flux returning from the gap GP to the permanent magnet 8
It is separated into two. Magnetic flux Ф2 penetrating conductive plate 11
Generates an eddy current EC in the conductive flat plate 11, so that when the drive side mechanism 2 is rotated in a desired direction by the rotating shaft 4, the interaction between the magnetic flux Ф2 and the eddy current EC causes the driven side mechanism 5 to be driven. And rotate. The torque transmitted to the driven mechanism 5 is proportional to the magnetic flux Ф2, and the entire magnetic flux 一定 is constant. Therefore, the torque can be adjusted by changing the magnetic flux Ф1 leaking to the adjusting plate 10. The change in the magnetic flux Ф1 leaking to the adjustment plate 10 is caused by the change in the aperture 1 provided in the adjustment plate 10.
It can be realized by changing the overlapping position of the surface 0a and the surface of the permanent magnet 8. That is, the ratio between the above-mentioned leakage magnetic flux Ф1 and magnetic flux Ф2 depends on the magnetic member 9 on which the permanent magnet 8 is mounted.
By loosening the nut 14 for tightening the bolt 12 provided on the magnetic member 9 and changing the mounting position on the circumference of the magnetic member 9,
The structural dimensions of the eddy current coupling 1 and the adjusting plate 10
Can be adjusted in accordance with the size and position of the opening 10a and the cross-sectional shape and size of the permanent magnet 8. Therefore, a desired transmission torque can be obtained.

Reference Example Next, a reference example of the present invention will be described with reference to FIGS.
FIG. 4 is a view corresponding to the first embodiment shown in FIG. 1, and FIG. 5 is a view seen from the arrow AA in FIG. The reference example is different from the first embodiment in that the permanent magnet 8 is rotated by rotating the magnetic member 9 on which the permanent magnet 8 is mounted and fixing it at a predetermined position with the bolt 12 and the nut 14. In the second embodiment, the mounting position on the circumference of the adjustment plate 20 is adjusted by the friction wheel 15 which comes into contact with the circumference of the adjustment plate 9. Reference numerals used in FIGS. 4 and 5 denote grooves 3a provided in the first rotating plate 3 so as to rotatably hold the adjusting plate 20 provided with the opening 20a with respect to the first rotating plate 3. And the friction wheel 15
The configuration is the same as in FIGS. 1 to 3 except for.

The above description is for the present invention, and other applications and modifications are possible. For example, the nut for fixing the adjustment plate is illustrated as a double nut in the first embodiment, but a wing nut is used for the nut, and the means for rotating the permanent magnet or the adjustment plate is different from that of the above-described embodiment. , Can be set freely. Further, in order to make the change characteristic of the transmission torque corresponding to the change in the relative position between the permanent magnet and the opening provided in the adjusting plate to a desired characteristic, the cross-sectional shape of the permanent magnet and the opening of the opening provided in the adjusting plate are required. The shape may be appropriately set according to the relative rotation angle between the permanent magnet and the adjustment plate.

[0010]

As described above, in the eddy current coupling of the present invention, the magnetic flux penetrating from the permanent magnet through the conductive flat plate disposed on the second rotating plate leaks to the adjusting flat plate by a desired amount and is reduced. With such a configuration, it has excellent effects as described below. By rotating the relative position between the permanent magnet and the adjustment plate, the relative position between the permanent magnet and the opening provided in the adjustment plate changes, and the above-mentioned reduced magnetic flux can be changed. The possible torque can be adjusted arbitrarily. In this case, the bolt fixed to the magnetic member provided with the permanent magnet for rotating the relative position between the permanent magnet and the magnetic plate is moved along the arc-shaped ellipse provided on the first rotating plate body. By moving the permanent magnet and fixing it with the nut, the relative position between the permanent magnet and the opening provided in the fixed adjustment plate can be easily and reliably changed. As described above, according to the present invention, the transmission torque can be adjusted with a simple operation and with high accuracy, so that the desired tension required by the load can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a half vertical sectional side view showing a first embodiment of an eddy current coupling of the present invention.

FIG. 2 is a front view of a first rotating plate as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is an enlarged sectional view of a main part showing a relationship between a first rotary plate and a second rotary plate in a direction BB of the eddy current coupling shown in FIG. 1 in the first embodiment.

FIG. 4 is a half vertical sectional side view showing a reference example of the eddy current coupling of the present invention.

5 is an enlarged front view of the first rotating plate as viewed in the direction of arrows AA in FIG. 4;

FIG. 6 is a half vertical sectional side view of a conventional eddy current coupling.

FIG. 7 is a front view of the first rotating plate as viewed in the direction of arrows AA in FIG. 6;

8 is an enlarged sectional view of a main part showing a relationship between a first rotating plate and a second rotating plate as viewed in the direction of arrow BB in FIG. 6;

Continuation of front page (56) References JP-A-54-81447 (JP, A) JP-A-3-96747 (JP, A) JP-A-59-81913 (JP, A) JP-A-57-22737 (JP) , U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H02K 49/02

Claims (1)

(57) [Scope of request for utility model registration] A first rotating plate provided with a magnetic member in which N-pole and S-pole permanent magnets are alternately arranged toward a surface of a circular rotating body formed of a magnetic material; A second rotating plate having a conductive flat plate disposed on the surface of the circular rotating body so as to face the permanent magnet;
An eddy current coupling formed by providing a predetermined gap between the rotating plate and the first rotating plate, wherein a predetermined shape formed along a circumferential direction on a permanent magnet of the first rotating plate. An adjusting plate having a predetermined magnetic characteristic provided with an opening of a predetermined size, the adjusting plate being fixed to the first rotating plate, and a predetermined dimension on an opposite surface of the magnetic member on which the permanent magnet is provided, on which the permanent magnet is provided. The permanent magnet is fixed by moving the bolt along an arc-shaped ellipse provided on the first rotating plate body on which the magnetic member is mounted, and tightening a nut at the predetermined position. An eddy current coupling device, wherein a relative position between the eddy current coupling device and the adjustment plate is set and fixed.