JPS59177764A - Motor device of floppy disc - Google Patents

Abstract

PURPOSE:To remove calking and to simplify constitution by selecting two magnetic discs simultaneously or one magnetic disc and using a coreless motor. CONSTITUTION:Six armature coils 7 are fixed on a magnetic body plate 2 to form a stator armature. Position detecting elements 8 are fixed on the magnetic body plate 2 in the hollow part of the armature coils 7. A field magnet is magnetized by N and S magnetic poles in the axial direction alternately in the peripheral direction to form 8 magnetic poles. The magnetic discs 13, 14 are fitted attachably/detachably to/from the opening end parts of recessed parts obtained by coupling the recessed parts 9a, 19a of cup bodies 9, 10 with through holes 13a, 14a. When an exciting coil 27 in a disc fixing electromagnetic lock means 15 is excited to select the magnetic disc 13, the projected part 17a of a moving body 17 is moved in the direction engaging with the recessed part 9a and the disc 13 is fixed on the cup body 9 and turned unitedly with the cup body 9. When power supply to the exciting coil 27 is interrupted to interrupt a signal from the disc 13, the moving body 17 is returned to the original position and the disc 13 is returned to free state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a floppy disk motor device that has recording disks on both the upper and lower surfaces of a rotor, and is capable of replaying either or both of the recording disks.

Conventionally, this type of floppy disk motor device rotates one recording disk using a motor with a core, and converts the audio of the recording disk into an audio signal using a means such as optical detection means or a magnetic head. , and even tried to convert it into a picture signal, and some of them were being executed.

Here, there is a desire to obtain both an audio signal and a picture signal, a desire to drive these recording disks at the same time, and a desire to extend either of the above signals, and furthermore. If it becomes possible to finely localize the recording density of the recording disk, the above means can be solved for either one of the recording disks by using the conventional technology means, and by providing two of them. -oJ It's a Noh thing.

However, such a configuration has the disadvantage that the configuration becomes complicated, the device 4 becomes large in size, and the cost becomes very similar.

The present invention has been made based on the above circumstances, and has two recording disks, allowing selection of 2Iv1 recording disks at the same time or any one of the recording disks, and furthermore, since it does not have a core, coking is prevented. The object of the present invention is to provide a floppy disk motor device that rotates smoothly, has a simplified structure, is compact, and is inexpensive.

The object of the present invention is to provide a rotor with a 2P (P is a positive integer of 1 or more) 4fi flat field magnet having N poles and S poles alternately in the axial direction; A stator armature is provided, which is composed of a group of armature coils wound in such a manner that the opening angle of the conductor portions facing each other and contributing to the generated torque is approximately equal to the pole width of the field magnet, and A recess is provided at approximately the center of both the upper and lower surfaces, and the recording disk is mounted on each of the upper and lower surfaces of the rotor by aligning the recess with the central through-hole of the recording disk, so that the recording disk can be fitted into each of the recesses. This is achieved by providing a floppy disk motor device characterized by being provided with an electromagnetic locking mechanism for fixing a recording disk.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical cross-sectional view of the main part of a floppy disk motor device according to an embodiment of the present invention.

1 is a floppy disk fixing base, 2 is a magnetic plate fixed on the upper surface of the fixing base 1, 3 is a bearing support fixed on the fixing base 1, and 4 and 5 are bearings supported by the support 3. , 6 is a rotating shaft made of a magnetic material that is rotatably supported by bearings 4 and 5, and 7 is an armature coil. They are fixedly installed on the plate 2 so as not to overlap with each other to form a stator armature.

Reference numeral 8 denotes a position detection element made of a magnetoelectric transducer such as a Hall IC or a Hall element, and is fixed on the magnetic plate 2 within the cavity within the frame of the armature coil 7. In this case, it is more convenient to arrange a printed circuit board on the magnetic plate 2.
Reference numeral 10 denotes recesses 9a and 10a fixed to both the upper and lower ends of the rotating shaft 6 so that four parts are formed on the upper and lower surfaces of the rotor, respectively.
11 is a cup body made of a good magnetic material and is fixed to the cup body 9; 12 is a flat annular field fixed to the inner surface of the cup body 11 and faces the stator 'Kameisogo';It's a magnet. The field magnet 12 has magnetic poles 8 which are alternately magnetized in the axial direction with N poles and S poles in the circumferential direction.
It has become extremely popular. Reference numerals 13 and 14 are recording disks on which audio and/or image signals are recorded, and since there are various means for reproducing the signals from these recording disks, the explanation thereof will be omitted here as it is outside the scope of the present invention. do. The recording disks 13, 1.4 have a concave portion 9a of the cup body 9, 1o approximately in the center thereof.

A through hole 13 with a diameter (large and radial) that substantially matches that of 10a.
a, 14a is formed. The above recording disc 1
3゜14 is the recess 9a, 1 of the cup body 9, 1o.
0a and the above-mentioned through hole], 3a, and 14a are removably attached to the open ends of the recesses 9a and 10a. J5.16 has recording disk 13,
14 is an electromagnetic locking mechanism for fixing the recording disk.

1.7 and 18 are moving bodies made of magnetic material of locking mechanisms 15 and 16, respectively, and include the recesses 9a and 10a and the through hole 13a.

It has protrusions 17a and 18a that can be freely fitted onto 14a.

Reference numerals 19 and 20 denote fixed shafts made of magnetic material and vertically disposed on the fixed sides 21 and 22 of the floppy disk body, respectively.

Magnets 24 are provided on the fixed shafts 19 and 20, respectively, and the tips of the fixed shafts 19 and 2o are arranged so as to face the back surfaces of the movable bodies 17 and 18 (the surface opposite to the floppy disk motor section). It is fixedly installed at the end opposite the floppy disk motor. The above moving body 1
A recess is formed in the back surface of each of 7 and 18, into which the 19° end of the fixed shaft is fitted.

5.26 is a magnetic plate fixed on the fixed side 21 and 22, 27.28 is the above magnet) 23.24
the recording disk 13 fixedly mounted on the surface facing the
14 fixed excitation coil, which is fixed to the magnetic plates 5 and 26. 29-1.29-2.30-1.30-2 are terminals for connecting the excitation coils 27 and 28. still,
The moving bodies 17 and 18 have their convex portions 17a and 18a respectively located in the concave portion 9, and the central through hole portion 13a1 and the concave portion 10a, respectively.
Center hole 14. Insert and fit the recording disk 13 into
．． The locking mechanisms 15 and 16 are provided on the axis of the rotating shaft 6 so that the rotating shaft 6 can be fixed.

FIG. 2 is a plan view of an eight-pole field magnet 12 used as an example in the present invention. This field magnet 12
is formed into an annular flat member which is magnetized in the axial direction so that N poles and S poles are alternately arranged at equal intervals in the circumferential direction.

FIG. 3 is a plan view of a stator armature in which six armature coils 7 are fixed on a magnetic plate 2 so as not to overlap each other. There are three position detection elements 8, and the stake armature and the field magnet 2 form a three-phase brushless motor. The three position sensing elements 8 are arranged within the frame cavity of any armature coil #7. The arrangement of the position sensing element 8 will be explained with reference to FIG. The armature coil 7 is formed into a fan frame shape in which the opening angle width of the conductor portions 7a and 7b that contributes to the generated torque in the radial direction is approximately equal to the magnetic pole width of the field magnet 12. In this embodiment, since the field magnet 12 has eight poles, the armature coil 7 is wound so that the opening angle width of the conductor parts 7a and 7b, which contribute to the generated torque, is approximately 45 degrees. It has become something like this.

Figure 4 shows the field magnet 12 and six armature coils 7-
1. . . . is a developed view of 7-6.

As is clear from this Fig. 4, six armature coils 7
-1. ..., 7-6 are arranged at equal intervals. Also 6 armature carp/l/7-1.・・・・・・
..., 7-6, it is possible to use a three-phase disk brushless motor, so it is sufficient to use three position detection elements. It is desirable that these three position sensing elements be placed on conductor portions that contribute to the generated torque of any three armature coils. That is, armature coil 7-6
．． 7-5.7-4 Conductor portion 7a that contributes to the generated torque
They are placed at the U, V, and W positions facing the . However, arranging the position sensing element at this position is cumbersome.

Therefore, for example, when considering the position of U, the dotted line enclosure U
′ corresponds to the position. Therefore, if the position sensing element that should not be placed at the U position is placed at the U' position, the position sensing element will not be placed at a position facing the conductor portion 7a that engages the torque generated by the armature coil 7-6. This is effective in terms of mass production, etc. Under similar conditions, armature coil 7-5.7-4
The position sensing elements to be placed at the symbol V and W positions for
They are placed at the dotted line enclosures V/ and W/ positions. By doing this, the position sensing element 8 is connected to the armature coil 7.
The reason for this is that the magnetic flux is disposed on the conductor portion 7a (or 7b) that contributes to zero-generating torque, weakening the magnetic flux, resulting in an inefficient disk-type brushless motor.

Therefore, it is possible to obtain a disc-type brushless motor with strong rotational torque.

Since the present invention has the above configuration, when selecting a signal from either the recording disk 13 or 14, it is sufficient to select the lock mechanism 15 or 16. Now, when selecting the recording disk 13, when the excitation coil 27 of the locking mechanism 15 is excited, the movable body 17 moves in a direction such that its convex portion 17a fits into the concave portion 9a, and the recording disk 13 is fixed to the cup body 9. Since it rotates together with the cup body 9, a predetermined record of No. 100 can be obtained. When cutting off the recording disk I3 signal, the excitation coil 27
All you have to do is cut off the power to it. As a result, the movable body 17 returns to its original position with the help of, for example, a spring (not shown), and the recording disk 13 is returned from the locked state to the free state. Recording disk 14
To select , the same operation as above may be performed using the automatic selection mechanism.

The floppy disk motor device of the present invention allows two recording disks to be mounted on both upper and lower surfaces of the motor device.

In addition, the thickness can be made thinner (whatever can be achieved is what can be obtained).

Moreover, it is only necessary to rotate one of the two recording disks, which solves the drawback of having to rotate two recording disks at the same time as in the past. Furthermore, it is possible to use two recording disks at the same time to obtain multiplexed signals, which is a great advantage.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing the main parts of a floppy disk motor device as an embodiment of the present invention, Fig. 2 is a plan view of an 8-pole field magnet, and Fig. 3 is a stator acid isograph consisting of 6 coils. FIG. 4 is an exploded view of the field magnet and the stator armature. DESCRIPTION OF SYMBOLS 1... Floppy disk fixing stand, 2... Magnetic plate, 3... Bearing supporter, 4, 5... Bearing, 6... Rotating shaft, 7... Usogo coil, 7a, 7b...Conductor portion contributing to generated torque, 8...Position detection element, 9,1
0...Cup body, 9a, 10a...Concave portion, 11...
・Cup body, 12...field magnet), 13.14・
...Recording disk, 13a, 14a...Center hole, 15, 16...Electromagnetic locking mechanism for fixing the recording disk, 17, 18...Movable body, 17a, 18a
- Convex portion, 19, 20... fixed shaft, 21. n...
Fixed side, Field, 24... Magnet, δ, 26... Magnetic plate, 27.28... Excitation coil for fixing recording disk, 29-1.29-2. : Illusion-1゜30-2...Electricity terminal.

Claims (1)

[Claims] 16 A rotor having a flat field magnet with 2P (P is a positive integer of 1 or more) poles having N poles and S poles alternately in the axial direction; A stator 'Kameisogo' is provided, which is made up of a group of armature coils wound in such a way that the opening angle of the conductor parts facing each other and contributing to the generated torque is approximately equal to the magnetic pole width of the field magnet. A recording disk provided with four portions substantially at the center of both upper and lower surfaces, and a recording disk is mounted on each of the upper and lower surfaces of the rotor by aligning the recessed portions with a central through-hole portion of the recording disk, and can be freely fitted into each of the two recessed portions. A floppy disk motor device characterized by being provided with a fixing electromagnetic locking mechanism. 2. The field magnet used is a 2P pole (P is a positive integer of 2 or more) having N and S poles alternately in the axial direction, and the armature coils are arranged so as not to overlap each other. A floppy disk motor device characterized by: