JPH01311401A - Rotary table device - Google Patents

Abstract

PURPOSE:To nearly eliminate shock or vibration from the outside by supporting a table in a state where it is floated in a space by providing a superconductor on either side the table or a fixing part and a magnet on the other side oppositely to the superconductor. CONSTITUTION:When the superconductors 22 and 26 are set at superconducting states, the table 16 is supported in the state where it is floated in the space by repulsion due to a Meissner effect which functions between the magnet 20 and the superconductor 22, and also, it is positioned and held at a constant position in a horizontal direction by the repulsion which functions between the magnet 24 and the superconductor 26. The table 16 can be rotated by exciting electromagnetic coils 32A1-32C2 sequentially is sequence of phase A phase B phase C phase A. Thus, a rotary tables device 10 can be supported in the state where it is floated in the space without bringing the table 16 into contact with a peripheral member, and torque is applied by the electromagnetic coil with non-contact, thereby, even when the shock is applied on or the vibration from the outside is transmitted to the fixing part 12, they are not transmitted directly to the part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary table device for rotating or changing the direction of an object on a table, and particularly to a rotary table device suitable for a turntable of a record player. .

[Conventional technology]

A record player records sound as a vibration waveform of grooves on the surface of a vinyl chloride resin disc, etc. The record is placed on a turntable, rotated, and recorded by tracing the spiral groove formed by the vibration waveform with a needle. It is a device that reproduces the sound produced by the device, and is widely used for playing music.

[Problem to be solved by the invention]

However, since conventional turntables are rotated by a motor via a belt, not only the vibrations of the motor are transmitted via the belt, but also vibrations from the outside such as when an object hits the player. When transmitted, these shocks and vibrations cause the turntable to vibrate, causing noise and interrupting the playback sound, which has the disadvantage of hindering accurate playback.

The present invention has been made in order to eliminate the drawbacks of the prior art, and an object of the present invention is to provide a turntable device that is less susceptible to external vibrations.

[Means to solve the problem]

In order to achieve the above object, the rotary table device according to the present invention has a superconductor attached to either the lower end surface of the rotatably arranged table or the position opposite to the lower end surface of the table on the fixed part side. , a magnet is disposed on the other side, and a plurality of electromagnetic coils are provided on the fixed part side and apply a magnetic field to the table to rotate the table.

[Effect]

In the present invention configured as described above, repulsive force due to the Meissner effect of the superconductor acts between the superconductor and the magnet, and the table can be supported in a floating state. Since the table is rotated by applying a rotating magnetic field generated by a plurality of electromagnetic coils provided on the fixed part side to the table, the table is rotated without coming into contact with surrounding members. Therefore, even if shocks or vibrations are applied to the player from the outside, the shocks or vibrations are not directly transmitted to the table, and noise during playback due to vibrations can be eliminated.

〔Example〕

A preferred embodiment of the turntable device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram showing an embodiment of a rotary table device according to the present invention.

In FIG. 1, the turntable device 10 has a table 16 inserted into a circular recess 14 formed in a fixed portion 12. As shown in FIG.

The table 16 has a circular shape with a flat upper surface and a cap shape with a hollowed-out central portion at the bottom. A donut-shaped magnet 20 is attached to the lower end surface of the peripheral cylindrical portion 18 of the table 16, and a superconductor 22 is provided at a position facing the magnet 20 of the fixed portion 12. The superconductor 22 is made of yttrium oxide (Y-Ba-Cu-0) or bismuth oxide (Bi-3r-Ca-Cu-O), which becomes superconductive at liquid nitrogen temperature.

On the other hand, a ring-shaped magnet 24 for positioning is also provided on the outer surface of the peripheral cylindrical portion 18, and a superconductor 2G is arranged on the side wall of the circular recess 14 of the fixed portion 12 at a position facing the magnet 24. Further, in the recess 28 of the table I6, a fixing portion 12 is provided.
In the fixed mounting, a member 30 is inserted, and a plurality of electromagnetic coils 32 are provided on the peripheral edge of the member 30.

Further, a plurality of convex portions (teeth) 34 made of a magnetic material are arranged on the inner circumferential surface of the peripheral cylindrical portion 18 of the table 16.

The convex portion 34 is made up of four convex portions 34a, 34b, and 34C134d arranged at 90 degree intervals as shown in FIG. and each electromagnetic coil generates a rotating magnetic field, and A-phase electromagnetic coils 32A+, 32Az and B
Phase electromagnetic coils 32B, 32Bt and C-phase electromagnetic coil 32C.

, 32C, and the respective electromagnetic coils of each phase are simultaneously excited.

The superconductors 22 and 26 are cooled by cooling units (none of which are shown) in which liquid nitrogen circulates, and are maintained in a superconducting state.

The operation of the embodiment configured as described above is as follows.

When rotating the rotary table device 10, the superconductor 22
．． 26 is cooled in a cooling section, and the superconductors 22 and 26 are brought into a superconducting state. When the superconductors 22.26 become superconducting, repulsive force due to the Meissner effect of the superconductors 22.26 acts between the magnet 20 and the superconductor 22 and between the magnet 24 and the superconductor 26. Therefore, table 16 is
Due to the repulsive force acting between the magnet 20 and the superconductor 22,
As shown in FIG. 1, it is supported in a suspended state. The table 16 also includes a magnet 24 and a superconductor 26.
Due to the repulsive force that acts between the

When the table 16 is rotated clockwise in FIG. 2, for example, the A-phase electromagnetic coil 32A.

, A2, the convex portions 34a, 34 of the table 16
c is attracted to a position opposite to phase A and stops. Therefore, when the current of the electromagnetic coils 32A+ and 32Az is cut off and the B-phase electromagnetic coils 32B+ and 32Bg are excited, the protrusion 3
4b and 34d are attracted to the B phase and stop at a position facing the B phase. Next, electromagnetic coils 32B+, 32Bz t
D cut the lightning current and CtH electromagnetic coils 32C1, 32G,
When energized, the convex portions 34a and 34c are attracted to a position facing the C phase. Hereafter, in the same manner, A phase → B phase → C phase -
The table 16 can be rotated by sequentially exciting the A phase and the electromagnetic coil.

In this way, the rotary table device 10 of the embodiment has the table 16
The table is supported floating in the air without contacting surrounding members, and rotational force is applied by the electromagnetic coil without contact, so even if a shock is applied to the fixed part 12 or vibration is transmitted from the outside, the table will remain stable. Since these are not directly transmitted to the 16, when applied to a record player, for example, noise will not occur or the reproduced sound will not stop.

In the above embodiment, the case where the convex part 34 was made of a magnetic material was explained, but for example, the convex part 34a,
34c is composed of an N-pole magnet, and the convex portions 34b, 34d
may be constituted by an S-pole magnet.

FIG. 3 shows another embodiment of the rotary table device according to the present invention.

In the rotary table device IO shown in FIG. 3, a shaft 40 is provided at the lower center of the table 16. The shaft 40 has a conical recess formed at its lower end, and a cone-shaped magnet 42 is placed in the conical recess.
is the installation. A cone-shaped superconductor 44 is provided below the shaft 40 of the fixed part 12 so as to face the magnet 42 . This superconductor 44 is made of yttrium oxide (Y-Ba-Cu-
0) and bismuth-based oxides (Bi-3r-Ca-Cu-0
) and becomes superconducting at liquid nitrogen temperature.

On the other hand, for example, four magnets 46 are attached to the lower end surface of the peripheral cylinder portion 18 at intervals of 90 degrees in the circumferential direction. These magnets 46 are arranged so that their north poles and south poles alternate in opposite directions. Six electromagnetic coils 48 arranged at 60 degree intervals are provided on the fixed part 12 below the peripheral cylinder part 18. Two of these electromagnetic coils 48 in the diametrical direction of the table 16 are A as in the previous embodiment.
phase, B phase, and C phase.

When the superconductor 44 of the turntable device 10L shown in FIG. 3 configured in this way is cooled below the critical temperature and becomes a superconducting state,
A repulsive force due to the Meissner effect of the superconductor acts between the superconductor 44 and the magnet 42, and the table 16 is supported in a floating state.

When the table 16 is to be rotated, this can be done by sequentially exciting the six electromagnetic coils 48 so as to generate a rotating magnetic field, as in the previous embodiment. Therefore, also in the turntable device 10 of this embodiment, the table 1
Since the element 6 is not in contact with surrounding members, it is possible to obtain the same effect as in the previous embodiment. Moreover, in the embodiment shown in FIG. 3, the table 16 is levitated by the cone-shaped magnet 42 and the superconductor 44.
positioning can be performed more accurately.

In addition, when a load acts unevenly on the table 16, the magnet 24 provided on the outer peripheral surface of the peripheral cylinder portion 18 and the magnet 2
The repulsive force acting between the table 16 and the superconductor 26 provided opposite to the table 16 prevents the table 16 from tilting.

In each of the above embodiments, the case where the present invention is applied to a turntable of a record player has been explained, but it can also be applied to a turntable of a compact disc player, a turntable of a multi-story parking lot or a train yard for changing the direction of vehicles, etc. I can do it.

When the rotary table device 10 of the embodiment is applied to a turntable in a multi-story parking lot or a rail yard, the turntable is large, so the superconductor and the cooling section can be provided on the table side. In addition, in the above embodiment, the force explained in the case of using a superconductor that becomes superconducting at liquid nitrogen temperature (if a so-called room-temperature superconductor is used, cooling is not required and the device can be made smaller; Since no cooling is required, the superconductor can be attached to the table side even when applied to the turntable of a record player or compact disc player.

〔Effect of the invention〕

As explained above, according to the present invention, a superconductor is disposed on one of the table and the fixed part, and a magnet is disposed on the other side facing the superconductor, so that the superconductor is not generated due to the Meissner effect of the superconductor. Due to the repulsive force between the table and the magnet, the table can be supported in a suspended state, and the effects of external shocks and vibrations can be almost eliminated.

[Brief explanation of the drawing]

FIG. 1 is an explanation of an embodiment of the rotary table device of the present invention, FIG. 2 is a cross-sectional view taken along the line -■ in FIG. 1, and FIG. 3 is an explanatory diagram of another embodiment. io - Turntable device, 12 -- Fixed part, 16 table, 20.24.42.46 - Magnet, 22.26.
44-Superconductor, 32.48 Electromagnetic coil. Agent Patent Attorney Tomo Murakami - Fig. 1 10 K1 12 K K 16: Table 20.24: 45 Stone 22.26: Superconductor 32° electric giant coil 34 convex Fig. 2 4C Figure 3 i. 42.46 koku 4 koku 44 Superelectric 114 pieces 48 Electric pressure coil

Claims (1)

[Claims] (1) A superconductor is attached to either the lower end surface of the rotatably arranged table or a position facing the lower end surface of the table on the fixed part side, and a magnet is arranged on the other side, and the fixed part side 1. A rotary table device, comprising: a plurality of electromagnetic coils installed in a rotary table, and applying a magnetic field to the table to rotate the table.