JPS60140519A - Rotary drum device - Google Patents

Abstract

PURPOSE:To reduce oscillation and noise by attaching a sheet-shaped member, where many polygonal line-shaped grooves are provided in the radial direction, to a rotating part which is rotated together with a revolving shaft as one body. CONSTITUTION:Thin sheets 26 and 27 are stuck to faces of a movable core 10 and a fixed core 10' which face each other. Many polygonal line-shaped grooves 28 are provided in the radial direction on the surface of the sheet 26; and when the movable core 10 is rotated, air is drawn into the gap between sheets 26 and 27 from the inside circumferential side and the outside circumferential side of sheets 26 and 27 along grooves and collides with the sheet 27 to generate a fluid dynamic pressure. This fluid dynamic pressure becomes a repulsive force between sheets 26 and 27, and a buoyancy is generated for the movable core 10 to reduce the thrust load acting upon a revolving shaft 1. Consequently, oscillation and noise in a bearing part are reduced considerably, and frictional resistance is reduced also to make it possible that the power consumption of a driving motor is reduced and the driving motor is made small-sized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a rotary drum device for a single-rotation helical type video tape recorder.

[Background of the invention]

The rotary drum device of a rotary helical type video tape recorder (hereinafter referred to as VTR) includes a single-rotation drum and a fixed drum. The magnetic tape, which slides over a predetermined range, is fixed to the magnetic field by 9 degrees.

In particular, in household VTRKs, a drive motor is built into the single-rotation drum in order to reduce the size and improve the rotation accuracy of the rotating drum, and the drive motor directly drives the rotating drum.

FIG. 1 is a block diagram showing a conventional example of such a rotating drum device, in which 1 is a rotating shaft, and 2.2' is a ball bearing.

3 is a fixed drum, 4 is a disk, and 5 is a rotating drum.

6 is a rotor magnet, 7 is a rotor yoke, 8 is a stator yoke, 9 is a stator coil, 1o is a movable core, 10'
is a fixed side core, and 11 is a magnetic hept.

2 in the figure, the stator 3 is provided with ball bearings 2.2' at the upper and lower parts of its center, and these ball bearings 2.2'
The rotary shaft 1 is rotatably supported by '. A rotating drum 5 is fixed to the upper end of the rotating shaft 1 with a disk 4 interposed therebetween. A slight gap is provided between the lower surface of the rotary drum 4 and the upper surface of the solid foot drum B.The magnetic conductor 11 is fixed to the rotary drum 5 so as to protrude slightly from this gap. It's well set up. Further, a movable core 10 is disposed on the lower surface of the disk 4, and a fixed core 10' is disposed in the upper recess of the fixed drum 2, rotating oppositely to the movable core 10.
are provided, and these movable side core 10 and fixed side core 10'
and form a rotating transformer. The coil terminal of the one-rotation side core 10 is connected to the coil terminal fL of the magnetic helide 11, and the coil terminal of the stationary side core 10' is connected to an external circuit.

- A stator yoke 8 is fixed to the lower end of the fixed drum 3, and the stator yoke 8 is further provided with a stator coil 9. Furthermore, a rotor yoke 7 is fixed to the lower end of the one-rotation shaft 1.f'L1 This rotor yoke 7Vc is
A single rotor magnet 6 is provided so as to face the stator coil 9 from the outside. The rotor magnet 9, the rotor yoke 7, the stator yoke 81, and the stator coil 9 form a drive motor.
is rotationally driven, and the rotating drum 5 rotates.

Therefore, a magnetic tape (not shown) slides over a predetermined range on the outer peripheral surfaces of the fixed drum 3 and the rotating drum 5.
The drive motor is driven by a drive current from a drive circuit (not shown), and the rotary drum 5 rotates, and the magnetic drum 11
scans the magnetic tape. During recording, a recording signal current flows through the fixed core 10'.

The magnetic field is supplied to the magnetic head 11 via a rotary transformer consisting of a rotating core 10. Also, during reproduction, the magnetic head 11
The regeneration signal is supplied to a regeneration circuit (not shown) through the rotary transformer.

The configuration of the conventional rotating drum device has been described above.In this rotating drum device, the rotating shaft 1 is supported at two locations by ball bearings 2. Thrust load N (axial load 1k on the rotating shaft 1 due to the weight of rotating bodies such as the rotating drum 5 and rotor yoke 7) and journal load (load in a direction perpendicular to the axial direction of the rotating shaft 1 at the bearing part) In contrast, the one-rotation shaft 1 is supported with high precision.

However, on the other hand, ball bearings have the following drawbacks.

(1) Due to the large number of rolling parts and solid contact parts, vibration and noise during rotation are large. Vibration.

The main causes of noise are vibration of the cage in the ball bearing, rolling noise of the balls on the raceway surface, and vibration of the raceway ring.

(2) Since grease is generally used to lubricate ball bearings, the frictional resistance of the bearings is large.

The power consumption of the drive motor increases.

(3) Since three or more gavages are provided between the outer bearing ring and the rotating shaft, the accuracy of restraining the rotating shaft is essentially low.

(4) Since the dimensions of the outer raceway ring are large, the dimensions of the housing portion tend to become large.

Due to the above-mentioned drawbacks, since the rotating drum device uses two ball bearings to support the rotating shaft 1, vibration and noise are extremely large, and the power consumption of the drive motor is also extremely large. However, there are disadvantages in that the precision of restraining the rotating part 1 is low, and the structure tends to be large.

[Purpose of the invention]

The object of the present invention is to eliminate the drawbacks of the above-mentioned prior art.

An object of the present invention is to provide a rotating drum device that reduces power transmission, noise, and power consumption, and can be downsized with high precision.

[Summary of the Invention] In order to achieve this object, the present invention attaches a sheet-like member provided with a large number of broken line grooves in the radial direction to a rotating part that rotates integrally with a rotating shaft, and the rotation of the rotating member is Accordingly, a fluid dynamic pressure is generated between the seat member and a fixing member that can be rotated in response to the seat member, and the fluid dynamic pressure makes it possible to reduce the thrust load acting on the rotating shaft.

[Embodiments of the invention]

]1 Implementation of the present invention f! lk drawing will be explained.

FIG. 2 shows an embodiment of a rotating drum device according to the present invention, in which 8' is a protrusion, 12 is a bearing housing, 13 is a shield case, 14.15 is a screw, 16 is a substrate, and 17 is a wiring board &1 f3, 113' is a magnetic sensor, 19 is a drive circuit component, 20.21 is a magnetic bearing, 2
2.2", 23.23' are magnetlides, 24 is a thrust bearing, 25 is a ball, and 26.27 is a seat. Parts corresponding to those in FIG. 1 are given the same reference numerals.

2 in the center of the fixed drum 3.

A bearing housing 12 is provided integrally with this, and magnetic shafts are provided at the upper and lower parts of the bearing housing 12, and a seed case 13 is attached to the lower part of the fixed drum 3, & this shield case 13 At the center of the stator yoke 7, which is attached to the drive motor and is a part of the drive motor,
Two point-contact type thrust bearings 24 having poles 25 are provided, and the rotary shaft 1 is supported by these two magnetic bearings 20, 21 and the thrust bearings 24.

A disk 4 is fixed to the upper end of the rotating shaft 1.

A rotating drum 5 is attached to the upper surface of this disk 4 with a screw 14.
Or one pair has been added. The rotating drum 5Vc has substrates 16 provided with magnetic heads 11 scattered thereon by screws 15, and the tips of the magnetic heads 11 are inserted from the gap between the one-rotation drum 5 and the fixed drum 3. It slightly protrudes outside.

- A drive motor is formed inside the shield case 13 attached to the lower part of the fixed drum.

This drive motor includes a rotor yoke 7 fixed to the lower end of a rotating shaft 1 projecting downward from a fixed drum 3, and an annular rotor magnet 9 attached to the rotor yoke 7.
In the magnetic field between the rotor magneto, the stator yoke 8 having a protrusion 8' facing the inner surface of the rotor magneto, and the protrusion 8' of the stator yoke 8 and the rotor magneto. It is an outer rotor type flat brushless motor consisting of a stator coil 9 attached to a protruding part 8', and the rotor magnet has N magnetism fL in the radial direction and is arsified in multiple poles in one rotation. The poles are arranged.

Furthermore, a wiring board 17 on which drive circuit components 19 and the like are mounted is attached to the outside of the bottom of the stator yoke 8, and the wiring board 17 is attached to the wiring board 17 so as to pass through the stator yoke 8 and face the rotor magneto. The magnetic sensor 18
, 18' are attached.

Therefore, when a drive current is supplied from the drive circuit component 19 to the stator coil 9, this drive current and the rotor magnet 6
Electrolytic force is generated by the interaction with the magnetic flux emitted from the magnetic pole surface of the rotor magnet, which generates a rotational force in the first rotor magnet () 6, causing the rotating shaft 1 to rotate, the rotating drum 5 to rotate, and the magnetic head 11 to be rotated. A magnetic tape (not shown) is scanned by a magnetic tape (not shown). The magnetic sensors 18 and 18' generate pulses from changes in the magnetic field accompanying the rotation of the rotor magnetide 6, and these pulses control the drive current of each phase supplied to the stator coil 9Vc to continue rotation. .

A thrust bearing 24 provided at the center of the stator yoke 8
is equipped with one ball 25, and this pole 25 has a rotating shaft 1.
The lower end surfaces of the rotary drum 5 are in point contact with each other, thereby supporting the load acting in the axial direction of the rotary shaft 1 due to the weight of the rotary body such as the rotary drum 5, that is, the thrust load. Further, a load acting in the radial direction of the one-rotation shaft 1, that is, a journal load, is supported by two magnetic bearings 20.21VC.

The magnetic bearing 20 consists of a cylindrical magnet 22 attached to the rotating shaft 1 and a cylindrical magnet 22' provided in the bearing housing 12 opposite thereto. ' are attached and detached in the radial direction so that the i-poles on their respective opposing surfaces have the same polarity, so a magnetic repulsion is generated between the magnets )22 and 22'. The magnetic bearing 21 also consists of a cylindrical magnet 23 provided on the rotating shaft 1 and a cylindrical magnet 23' provided in the bearing housing 12, and similarly to the magnetic bearing 20, it has a magnetic screw) 2!1. .23' are magnetized so that magnetic repulsion is generated between them. This magnetic repulsive force supports the journal load acting on the rotating shaft 1.

Further, on the lower end surface of the disk 4, a movable core 10 or
``In addition, the fixed leg side core 10 is mounted on the fixed drum 3 opposite to this.
The movable core 10 and the fixed core 10' form a rotary transformer for transmitting signals between an external circuit (not shown) and the magnetic helide 11.

Thin sheets 26 and 27 are attached to mutually opposing surfaces of the movable core 10 and the fixed core 1o, respectively, and these sheets 26 and 27 form fluid dynamic pressure generating means using air. are doing. The sheet 27 has a flat surface, but as shown in FIG.
When the movable core 10 rotates, air is drawn into the gear 91 between the seats 26 and 27 from the inner and outer peripheries of the seats 26 and 27 along the groove 28, and the air is drawn into the seat 27. The collision generates fluid dynamic pressure (ie, air dynamic pressure).

This fluid dynamic pressure is between sea) 26.27 (i.e.

This is a repulsive force between the movable core 10 and the fixed core 10'), and this generates a buoyancy force in the movable core 10, thereby reducing the thrust load acting on the rotating shaft 1.

FIG. 4 shows the distribution of the dynamic pressure value P of such fluid dynamic pressure means. The dynamic pressure value P is the viscosity of the fluid (air)/sheet 2
It is proportional to the product of the rotational angular velocity ω of 6.27 and the radius of the seat 26.27 to the fourth power, and is inversely proportional to the square of the gap width (clearance) between the seats 26 and 27. The dynamic pressure value P becomes maximum at the bending point of the groove 28 of the sheet 26 (point A in FIG. 3). This is caused by the air flowing along the groove 28 from the inner circumferential side of the seat 26, 27 and the air flowing into the groove 28 from the outer circumferential side of the seat 26, 27.
This is because the air flowing in along the curve 8 collides with the air at the bending point.

2. The format of the groove 28 of the sheet 26 is as follows.

There are methods such as machining and ma-tdf. Also, sheet 26
27 is made of non-magnetic material.

As shown in FIG. 6 1al, the movable core 10 is provided with a slot 29 on its surface (the surface facing the fixed core 10') and has no uneven shape t, and a coil 30 is provided in the slot 29.
A sheet 26 is pasted to cover the surface of the fixed core 10' (FIG. 5, 1fi+), and similarly, a flat sheet 27 is pasted to cover the uneven surface of the stationary core 10'. because there is.

Even if the surfaces of the movable core 102 and the fixed core 10' are uneven, this does not impede the generation of fluid dynamic pressure.

According to this embodiment, the number of solid contact parts of the bearing part is greatly reduced, and the load applied to the bearing part can be reduced, so the vibration and noise applied to the bearing part are greatly reduced.
21. , the wear resistance A is reduced, making it possible to reduce the power consumption and downsizing of the drive motor, and furthermore, the wear of the bearing portion is reduced, resulting in a longer life.

In particular, vibrations caused by bearings cause vibrations in the drive motor, causing large vibrations in the sharpening head, the running magnetic tape 2, and the tape running system mechanism. The performance of the embodiment is much the same as that of the above, and extremely great effects can be obtained. In addition, thrust load 1Y: Since it is supported on the lower end surface of the rotating shaft by a thrust bearing, it is a two-rotation drum. can do.

FIG. 6 1al + lbl + (at is a front view, a back view 2, and a cross-sectional view showing another example of the sheet 26 in FIG. ' is a convex part, 33.34.33', 34'
is the coil terminal.

In this specific example, the sheet 26 is made of a thin insulating plate, and as shown in FIG. 28. On the back surface of the sheet 26, a ring-shaped convex portion 32. is formed as shown in FIG. 6, 1b+.
32' are provided, and coils 30', 30'' are formed on these convex parts 32.32' by machining, plating, etc. Furthermore, the coil terminals 33.32' of the coil 30' are formed.
34 and 30 coil end beds 33', 34' are led out to the outside.

The structure of the front and back surfaces of such sheet 26 is shown in FIG. 6, et.

10,000 on the surface of the movable core 10 (Fig. 2).

Two annular slots are provided, and the convex portion 32.52" 11 on the back side of the sheet 26 is inserted into these slots and bonded together. Therefore, the sheet and the coil tonnage are attached to the movable side core 10 in the same manner. .

The same applies to the stationary core 10' (FIG. 2) 2 and the sheet 27 attached thereto.

Coil and sheet 2 of a single-turn transformer according to this specific example
6 grooves 28 can be formed simultaneously with high precision.

FIG. 7 is a configuration diagram showing another specific example of the bearing section in FIG. Parts corresponding to the figures are given the same reference numerals.

In this specific example, two fluid dynamic pressure bearings 35, 35' are provided between the magnetic bearings 20, 21 of FIG.

In FIG. 7, the magnetic bearing 20 of the upper blade is omitted.

That is, thin and shallow "<"-shaped grooves 37.37' are provided at two locations between the magnetic bearings 20 and 21 for one rotation @1, and the bearing housing 5 is provided opposite to these grooves 37.37'.
6+36'Y is provided, the bearing structure 36 and the groove 37 form a fluid dynamic pressure bearing 35, and the bearing structure 36' and the groove 37' form a fluid dynamic pressure bearing 35'.

When the rotating shaft 1 rotates, fluid (air) flows into the fluid dynamic pressure bearings 35, 35' from above and below along the grooves 37, 37', and fluid dynamic pressure is generated. This fluid dynamic pressure generates a centripetal force on the one-rotation shaft 1 to hold it at the nf center.

In this specific example, the magnetic shaft 920.21 and the fluid dynamic bearing 3
5.35', a large center force is applied to the rotating shaft 1, and the rotating shaft 1 can be held centered with high precision.

FIG. 8 is a block diagram showing another embodiment of the rotating drum device according to the present invention, in which 11' is a magnetic helide, 38 is a lead wire, and the parts corresponding to FIG. 2P and FIG. is the same as −
I'm wearing a ladle number.

In this embodiment, one rotating shaft 1 has two fluid dynamic pressure bearings 35.3.
5' and supported by a thrust bearing 24 a, also.

Fixed side core 10' bearing housing 12 of rotating transformer
A rotating side core 10 is attached to the disk 4 on the upper end surface thereof, facing the hole.

A rotor yoke 7 of the drive motor is attached to the lower end surface of the disk 4, and a rotor magnet 9 magnetized in the axial direction (one time in thickness) is attached to this rotor yoke 7. The stator yoke 8 is provided on the bottom surface of the fixed drum 3 to face the rotor magnet 9.

Stator coil in this stator yoke 8? is provided. Two wiring boards 17 are attached to the lower end of the stator yoke, and two magnetic sensors are mounted on the wiring boards 17 through the stator yoke 8 so that the tip faces the magnetic pole surface of the rotor magnet 6. 18°18' is provided.

Movable core 10y and fixed core 10' of the rotating transformer
The above-mentioned sheets 26 and 27 are attached to the opposing surfaces of the rotary shaft 1, thereby forming a fluid dynamic pressure generating means for reducing the thrust load N acting on the rotating shaft 1.

The coil bed of the stationary core 10' of the rotating transformer is:

It is connected to a predetermined circuit component on the wiring board 17 by a lead wire 38 made of a conductive pattern or the like.

According to this embodiment, since the drive motor is formed within the fixed drum, the single-rotation drum device becomes thinner and more compact. In addition, rotating drum 5. The disk 4 and the rotor of the drive motor.

1 fixed to one end of the rotating shaft 1 when viewed from the rotating shaft 1
The rotary shaft 1 becomes an inertial body in close contact with the grooves, so that the natural oscillator of the rotary shaft 1 becomes extremely high, and stable rotational performance against disturbance torque can be obtained.

FIG. 9 is a block diagram showing still another embodiment of the rotating drum device according to the present invention, 39 and 39' are magnets, and parts corresponding to those in FIG. 8 are given the same reference numerals. .

In this embodiment, the drive motor is a cylindrical circumferentially opposed motor, which is built into the drum.

That is, the stator of the drive motor (stator yoke 8 and stator coil 9) is attached to the outer circumferential surface of the bearing housing 12, and the n1 rotor (rotor yoke 72 and rotor magneto) is attached to the inner circumferential surface of the disk 4. is attached to.

A movable core 10 of the rotary transformer is provided on the lower end surface of the disk 4, and a fixed core 10' is provided on the fixed drum 3 opposite to the movable core 10.

On the opposing surfaces of the movable core 10 and the stationary core 10', the aforementioned seams 26 and 27 are provided to form fluid dynamic pressure generating means.

Further, a flat annular magnet 39' is provided on the upper end surface of the bearing housing 12, and a similarly flat annular magnet 39' is provided on the rotor yoke 7, which is provided on the lower end surface of the center of the disk 4 opposite to this. A magnet 39 is provided. Magne W) 39.39' is axially attached to 2
Arranged so that arsenic poles of the same polarity face each other,
Magnetic repulsion (levitation force) is generated at the magnet 39° and 39'.

In this example, the fluid dynamic pressure according to C) 26.27;
The magnetic repulsion between the magnets W and M9.39' and the fact that the drive motor is of a circumferentially opposed type and the attractive force between the rotor magnet 6 and the stator yoke 8 are in the direction perpendicular to the rotation axis 1. , the thrust load applied to the rotating shaft 1 is significantly reduced, which reduces the wear of the thrust load receiver 25 and extends its life.In addition, vibration and noise are reduced.1.The power consumption of the drive motor is reduced. , miniaturization is realized. Furthermore, since the rotor of the drive motor, the movable core 100, the rotating drum 52, and the disk 4 work together to increase the moment of inertia of the rotating shaft 1, the rotational smoothness of the rotating body is significantly increased.

FIG. 10 shows still another embodiment 9' of the rotating drum device according to the present invention! 26' is a sheet, 40 is a magnetic plate, and parts corresponding to FIG. 2P and FIG. 7 are given the same reference numerals.

In this embodiment, a movable core 102 and a fixed core 10' of a one-turn transformer each have a sheet of 26.27V.
and to generate fluid dynamic pressure.

A sheet 26' similar to that shown in FIG. 3 is attached to the bottom surface of the one-rotor yoke 7, and the drive motor is of an outer rotor type, and a sheet 26' similar to that shown in FIG. The system is designed to generate fluid dynamic pressure.

The wiring board 17 is provided on the rotary transformer side at the bottom of the fixed drum 3, and the magnetic sensor 18, which is provided on this wiring board 17,
18' is a single rotor magnet with the bottom of the fixed drum 3 facing the rotor magnet 6 at true speed, and a magnetic plate 40 provided around the magnetic sensor 18 and 19' on the bottom drive motor side of the fixed drum 3. A part of the polishing flux from 6 is sent to the magnetic sensor 18,
Concentrating on 18'. Due to such a force, an attractive force is generated between the first rotor magnet 9 and the magnetic plate 40, and therefore.

A levitation force acts on the rotor of the drive motor.

The levitation force generated on the rotor of the drive motor 9 The fluid dynamic pressure 2 due to the sheet 26 and 27 which is applied to the rotor transformer, the sheet 26' attached to the rotor yoke 7 and the shield case 2
13, the thrust load acting on the rotating shaft 1 is significantly reduced.

2. In FIG. 10, the journal load of the one-rotation shaft 1 is supported by the grinding bearing 21 and the fluid dynamic pressure bearing 35, but the bearing is not limited to these.

FIG. 11 1al and Ibl are block diagrams showing other specific examples of the drive motor portion of FIG. 10, and 26", 2
6”.

27' is a sheet, and parts corresponding to those in FIG. 10 are given the same reference numerals.

In these specific examples, the drive motor is of an outer rotor type or has one rotor at the top and a stator at the bottom.

The example of the leg body shown in FIG.
A seat 26' is provided as shown in the figure.
A fluid dynamic pressure bearing is provided between the stator yoke 8 and the stator yoke 8.

In the specific example shown in FIG. 11, the sheet 26' shown in FIG.

A flat surface sheet 27'Y is provided on the upper end surface of the center of the stator yoke 8 opposite to the sheet 26''. , and between the seats 26'' and 27', which contribute to reducing the thrust load acting on the rotating shaft 1. moreover.

A sheet 26# as shown in FIG. 3 is provided on the magnetic pole surface of the rotor magnet 6 facing the stator coil '9, and fluid dynamic pressure is generated between the sheet 26#' and the fixed coil 9. , beam protrusion 8' of rotor magneto and stator yoke 8
Alleviates the suction force generated between the

The journal load acting on the rotating shaft 1 is reduced.

In this specific example, the surface of the stator coil 9 must be flattened, which can be done, for example, by
The stator coil 9 may be a sheet-like coil in which a pattern of coil conductors is formed on a sheet by cutting, machining, or the like.

12(a) and 12(b) are block diagrams showing still another specific example of the drive motor portion in FIG. 10, and parts corresponding to those in FIG. 10 are given the same reference numerals.

This specific? 11 is a drive motor of a flat surface facing type, and a sheet 26' as shown in FIG. 3 is attached to the magnetic pole surface of the rotor magnetoritro. Fluid dynamic pressure is generated between the stator coil 9 similar to that described above, and the attraction force between the first rotor magnetoresistive and stator yoke 8 is reduced to reduce the thrust load acting on the single rotation shaft 1. It is something.

The embodiments of the present invention have been described above.
It goes without saying that the groove of 26126'126"126#F can be formed by punching, cutting, electric discharge machining, etc. in addition to drilling and plating.

Also, without using these sheets, for example.

It is also possible to generate fluid dynamic pressure by fixing an insulating material to the magnetic pole surface of the rotor magnet and forming similar grooves in it. All of these are within the scope of the present invention.

〔Effect of the invention〕

As explained above, the present invention generates fluid dynamic pressure between a rotating part and a fixed part, and uses the fluid dynamic pressure to levitate the rotating part with respect to the fixed part. It is possible to significantly reduce the thrust load N acting on the bearing, which can significantly reduce vibration and noise in the bearing, and also to reduce the frictional resistance of the bearing, resulting in lower power consumption of the drive gear. , it is possible to downsize, reduce the torque fluctuations that occur in the bearing part, make the rotation of the rotating body smoother, and realize a longer life of the bearing. A rotating drum device can be provided.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a conventional rotating drum device, FIG. 2 is a block diagram showing an embodiment of the rotating drum device according to the present invention, and FIG. 3 is a plan view showing the sheet in FIG. 4 is a fluid dynamic pressure distribution diagram of the fluid dynamic pressure generating means 2 in FIG. 2, FIG. 5 1al is a plan view of the movable core of the rotary transformer in FIG. Cross-sectional view showing the state in which the sheet in Figure 3 is pasted, Figure 6 1al + lbl
* (cl is a front view showing another specific example of the seat shown in FIG. 2, and a back view is a two-way sectional view. FIG. 7 is a configuration diagram showing another specific example of the bearing part in FIG. 2, and FIG. , FIGS. 9 2 and 10 are block diagrams showing other embodiments of the rotating drum device according to the present invention, and FIG. 11 7 +
(t)l and FIG. 12(al, +1)l are block diagrams showing other specific examples of the drive motor portion of FIG. 10. 1... Rotating shaft, 3... Fixed drum, 5... Rotating drum, 6... Rotor magnet, 7... Rotor yoke, 8... Stator yoke k 9...・Stator coil,
11...magnetic helad, 26.26', 26", 2
6", 27, 27'... Sheet, 28... Groove. Proxy masu filler Nao Miaki Daisai 1, 2, 3, 4th area, 5th (1)) 0 6th area (Q) Off side figure 8 figure 4 tJ figure 9 figure 10 figure 11 (1 (b) figure 12 (0)

Claims (1)

[Claims] A rotating drum device consisting of a rotating drum with a magnetic heel, a fixed drum, and a drive motor, the rotating shaft of the rotating drum being connected to the drive motor to rotate the rotating drum. A member provided with a large number of broken line grooves χ is provided on a rotating part that rotates integrally with the rotating shaft, and the member and a fixed part that can be rotated relative to the member form a fluid dynamic pressure generating means, and the rotating part A rotating drum device characterized in that a thrust load acting on the rotating shaft can be reduced by fluid dynamic pressure between the member and the fixed portion generated by rotation of the rotating drum device.