JPH0444505B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method of assembling a disk drive motor for rotationally driving a floppy disk.

[Background of the invention]

In recent years, improving recording density has become one of the most important technical issues in floppy disk drives. The direct drive system, which directly drives the floppy disk without using a transmission mechanism, has become mainstream.

FIG. 3 shows an example of a disk drive motor applied to a conventionally known floppy disk drive of this type.

In this figure, 1 is the disk drive motor, 2
is the rotating shaft of disk drive motor 1, 3 is the rotating shaft 2
4 is a pulse generator (PG) that detects the phase of the turntable 3.
), 5 is a frequency generator (Frequency Generator) for detecting the rotational speed of the disk drive motor;
(abbreviated as FG).

The disk drive motor 1 consists of a rotor part 6 and a stator 7, and a rotating shaft 2, which is erected at the central axis of the rotor part 6 via a connecting member 6A, is rotatably mounted on a bearing 8 provided in the stator part 7. It is combined into one body by supporting it. In the rotor section 6, ring-shaped rotor magnets 10, which are divided and magnetized at equal intervals along the circumferential direction, are fixed to the inside of a circular rotor yoke 9 formed of a soft magnetic material. Furthermore, in the stator section 7, a plurality of drive coils 12 are arranged circumferentially at positions facing the rotor magnet 10 of the stator yoke 11 formed of a soft magnetic material. By passing a current through this drive coil 12, the stator yoke 9 is magnetized in equal intervals along the circumferential direction.
Torque is generated in the rotor magnet 10 between which a field magnetic flux is generated, and the rotor section 6 is rotationally driven with respect to the stator section 7.

The turntable 3 has a center hole 13 through which the rotating shaft 2 is inserted, and a drive pin insertion hole 14 through which a drive pin (to be described later) is inserted, and the tip of a spring member 15 stretched on the back surface. The tip end 16a of the drive pin 16 fixed to the drive pin insertion hole 1
4 and protrudes from the upper surface of the turntable 3.

PG 4 includes a PG magnet 17 fixed to the outer surface of the rotor yoke 9, and a PG magnet 1 fixed to the outer surface of the rotor yoke 9.
PG provided on the stator yoke 11 opposite to 7.
The magnetic field from the PG magnet 17 is converted into PG as the rotor yoke 9 rotates.
The drive pins 16 are sequentially detected by the pick-up 18 and are in a constant positional relationship with the PG magnet 17.
It is designed to detect the phase of

The FG 5 consists of an FG magnet 19 fixed to the upper surface of the outer edge of the rotor yoke 9, and an FG coil (not shown) provided on the stator yoke 11 facing the FG magnet 19. As the yoke 9 rotates, a current proportional to the rotation speed of the rotor yoke 9 is generated in the FG coil, and the rotation speed of the rotor yoke 9 is controlled by this current.

FIG. 4 shows an example of a floppy disk applied to the above disk drive motor.

In the figure, 20 is a magnetic disk, 21
is a disk cartridge that rotatably stores this magnetic disk 20. Above magnetic disk 2
A hub 22 formed of a thin metal plate is fixed to the center of the 0. And this hub 2
2 has a central hole 23 into which the tip 2a of the rotating shaft 2 protruding from the upper surface of the turntable 3 is inserted, and a through hole 2 into which the drive pin 16 is inserted.
4 have been established.

The disk drive motor 1, which has cooled down, inserts the tip 2a of the rotary shaft 2 protruding from the top surface of the turntable 3 into the center hole 23 of the hub 22, and
The floppy disk is mounted on the turntable 3 by inserting the tip 2a of the rotating shaft 2 protruding from the top surface of the turntable 3 into the through hole 24 of the turntable 2, and the driving force of the disk drive motor 1 is applied. The information is transmitted to the magnetic disk 20.

The disk drive motor configured in this way is
The PG4 detects the circumferential phase of the floppy disk mounted on the turntable 3 and regulates the writing/reading start position to a constant position, thereby ensuring compatibility of the floppy disk. It's summery.

In this way, in order to regulate the writing/reading start position to a fixed position and ensure compatibility of the floppy disk, the drive pin 16 and the PG magnet 1 must be
7 and the PG pickup 18 must always maintain a constant positional relationship with respect to the rotating direction of the rotary shaft 2.

Conventionally, when assembling the disc drive motor 1 and turntable 3, the disc drive motor 1 is first assembled, then the turntable 3 is fixed to the rotating shaft 2 of the disc drive motor 1, and these are assembled together. The disk drive motor 1 and turntable 3 are set in a required jig, and this jig is used to set the PG magnet setting part (PG pick-up) on the outer surface of the rotor yoke 9, which is indexed from the drive pin setting part of the turntable 3. 18),
A method is adopted in which the PG magnet 17 is bonded.

However, fixing the PG magnet 17 to the rotor yoke 9 by adhesive not only has low productivity because it takes a long time for the adhesive to harden, but also It is difficult to accurately position the PG magnet 17 because it is easy to misalign;
PG magnets have problems in that they have low reliability in terms of strength and may fall off during use.

[Purpose of the invention]

The present invention was devised in view of the problems of the prior art described above, and is a disc that is easy to assemble, has high productivity, and allows precise positioning of the drive pin, PG magnet, and PG pickup. It is an object of the present invention to provide a method for assembling a drive motor.

[Summary of the invention]

In order to achieve this object, the present invention provides the following steps when assembling the disk drive motor having the above configuration:
Each of the constituent members was processed as described below, and the following jigs were used to assemble them using the method described below.

That is, the rotor yoke has a rotating shaft mounting hole for fixing the rotating shaft and a pin insertion hole for positioning the PG magnet, and the stator yoke has a pin for positioning the PG pickup. An insertion hole and a pin insertion hole corresponding to the pin insertion hole for positioning the PG magnet were opened.

On the other hand, the jig is provided with a shaft hole for positioning the rotating shaft and a pin hole for positioning the drive pin, as well as a stator yoke positioning pin for positioning the stator yoke, and a rotor yoke positioning pin for positioning the stator yoke. A rotor yoke positioning pin is provided protrudingly for positioning the rotor yoke.

After the rotating shaft and turntable are integrated, the rotating shaft is inserted into the shaft hole made in the jig, and the drive pin is inserted into the pin hole made in the jig, and the rotation with respect to the jig is performed. Position the shaft and drive pin. Next, the rotating shaft is inserted into the bearing, the stator yoke positioning pin is inserted into the insertion hole, and the rotor yoke positioning pin is inserted into the insertion hole, respectively, to position the PG pickup relative to the drive pin. Furthermore, the rotating shaft and rotor yoke positioning pin protruding above the stator yoke are
Insert the PG magnet and PG into the rotating shaft mounting hole and pin insertion hole provided in the rotor yoke.
Assemble the disk drive motor using a method such as positioning with a pick-up.

〔Example〕

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

FIG. 1 is an exploded perspective view showing an embodiment of the method for assembling a disk drive motor according to the present invention, and FIG. 2 is an exploded perspective view showing the structure of a rotor yoke.

In these figures, 30 is a jig, 31 is a shaft hole made in the jig 30, 32 is a pin hole also made in the jig 30, and 33 is a stator yoke positioning pin protruding from the jig 30. , 34 is also jig 3
A protruding rotor yoke positioning pin is shown at 0, and members similar to those shown in FIG. 2 are designated by the same reference numerals.

The shaft hole 31 and pin hole 32 opened in the jig 30 fit the tip 2a of the rotating shaft 2 protruding from the top surface of the turntable 3 and the drive pin 16 attached to the turntable 3 somewhat tightly. They are opened with matching diameters and spacing.
In addition, the stator yoke positioning pin 33 and the rotor yoke positioning pin 34 protruding from the jig 30 do not interfere with the turntable 3 when the turntable 3 is mounted on the jig 30, and When the stator yoke 11 is attached to the fixture 30, it is provided in a protruding position so as not to interfere with the members provided on the stator yoke 11, that is, the required electrical wiring, the FG coil, and the drive coil 12.

The turntable 3 can be exactly the same as that applied to the conventional disk drive motor described above.

The stator yoke 11 corresponds to the stator yoke positioning pin 33 and the rotor yoke positioning pin 34 protruding from the jig, and when the stator yoke 11 is mounted on the jig 30, Place the stator in a position such that the drive pin 16 of the turntable 3 already attached to the tool 30 and the PG pickup 18 attached to the stator yoke 11 have a preset required positional relationship. Insertion holes 35 and 36 are provided through which the yoke positioning pin 33 and the rotor yoke positioning pin 34 are inserted. Needless to say, the diameters of the insertion holes 35 and 36 are set to a diameter sufficient to allow the stator yoke positioning pin 33 and the rotor yoke positioning pin 34 to be inserted therein rather closely.

As shown in FIG. 2, an FG magnet 37, a PG magnet 38, and a connecting member 6A are attached to the rotor yoke 9 in advance. The FG magnet 37 and the PG magnet 38 are integrally formed using a magnetic material that can be molded with a mold, such as a plastic magnet or a ferrite magnet. By fitting the PG magnet 38 into the cut PG magnet fitting groove 39 and gluing the FG magnet 37 to the FG magnet mounting portion 9a of the rotor yoke 9, it can be integrated into the rotor yoke 9. . The connecting member 6A corresponds to the rotor yoke positioning pin 34 protrudingly provided on the jig, and when the connecting member 6A is attached to the jig 30, the fixing member already attached to the jig 30 is attached to the connecting member 6A. An insertion hole 39 for inserting the rotor yoke positioning pin 34 is provided at a position such that the PG pickup 18 of the child yoke 11 and the PG magnet 38 provided on the rotor yoke 9 face each other.

When assembling the disk drive motor 1 using the jig 30, turntable 3, stator yoke 11, and rotor yoke 9 configured as described above, first, the shaft hole 31 and pin The top surface of the turntable 3 is fixed on the surface of the jig 30 by fitting the tip 2a of the rotating shaft 2 protruding from the top surface of the turntable 3 and the tip 16a of the drive pin 16 into the hole 32. Next, the stator yoke positioning pin 33 and rotor yoke positioning pin 34 of the jig 30 are inserted into the respective insertion holes 35 and 36 made in the stator yoke 11, and the stator yoke 11 is attached to the jig 30. Then, the drive pin 16 and PG pickup 18 are aligned. Next, the rotor yoke positioning pin 34 protruding from the stator yoke 11 is inserted into the pin insertion hole 39 provided in the connecting member 6A, and the rotating shaft 2, which also protrudes from the stator yoke 11, is inserted into the connecting member 6A. The rotor yoke 9 and the rotating shaft 2 to which the connecting member 6A is attached by press fitting into the rotating shaft mounting hole opened in the rotor yoke 9 and the rotating shaft 2.
and fix it. By this, PG magnet 1
7 and the PG pickup 18 to complete the assembly.

In the above embodiment, the connecting member 6A and the rotor yoke 9 are assembled together in advance, and the connecting member 6A is attached to the rotor yoke positioning pin 34 of the jig 30.
By attaching it to the PG magnet 17
Although this is an embodiment in which the positioning of the PG pickup 18 is performed, the gist of the present invention is not limited to this. It is also possible to form a means and first attach the connecting member 6A alone to the rotating shaft 2 and the rotor yoke positioning pin 34, and then attach the rotor yoke 9 to the connecting member 6A.

〔Effect of the invention〕

The method for assembling a disk drive motor of the present invention allows the disk drive motor to be assembled by simply mounting the rotating shaft, turntable, stator yoke, and rotor yoke on a jig in order. Since there is no need to glue the PG magnet after assembling the drive motor, productivity can be improved accordingly. In addition, the PG magnet is formed integrally with the FG magnet, and is positioned by fitting into the fitting groove cut out in the rotor yoke.
The positioning accuracy of the PG magnet is high, ensuring compatibility with floppy disks. Furthermore, since the PG magnet is formed integrally with the FG magnet, it is possible to eliminate the conventional fear of the magnet falling off during use.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a method for assembling a disk drive motor according to the present invention, FIG. 2 is an exploded perspective view showing the structure of a rotor yoke, and FIG. FIG. 4 is a sectional view showing an example of a drive motor, and FIG. 4 is a front view of a floppy disk applied to the disk drive motor of the present invention. 1... Disk drive motor, 2... Rotating shaft, 3
... Turntable, 4 ... Pulse generator (PG), 5 ... Frequency generator (FG),
6... Rotor section, 6A... Connection member, 7... Stator section, 9... Rotor yoke, 11... Stator yoke, 16... Drive pin, 17... PG magnet, 18... PG pickup, 19...FG magnet, 30...Jig, 31...Shaft hole, 32...
Pin hole, 33...Stator yoke positioning pin, 3
4...Rotor yoke positioning pin, 35, 36...
...Insertion hole, 37...FG magnet, 38...PG
Magnet, 39...Pin insertion hole.

Claims (1)

[Claims] 1. A rotary shaft 2, a turntable 3 fixed to one end of the rotary shaft, a drive pin 16 elastically held by the turntable, an FG magnet 37, and a PG magnet 38 are attached. The stator yoke 11 includes a rotor yoke 9, a bearing 8 for rotatably holding the rotating shaft, and a PG pickup 18 for detecting the rotational position of the rotor yoke. A method of assembling a disk drive motor 1 using a jig 30, in which the rotor yoke 9 has a rotating shaft mounting hole for fixing the rotating shaft and a pin insertion hole for positioning the PG magnet. The stator yoke 11 has a pin insertion hole 35 for positioning the PG pickup, and a pin insertion hole 36 opened corresponding to the pin insertion hole 39. The jig has a shaft hole 31 for positioning the rotating shaft 2, a pin hole 32 for positioning the drive pin 16, and a fixing hole 32 for positioning the stator yoke 11. It has a child yoke positioning pin 33 and a rotor yoke positioning pin 34 for positioning the rotating yoke 9. After the rotating shaft 2 and the turntable 3 are integrated, the jig 30 is Inserting the rotating shaft 2 into the shaft hole 31 and inserting the driving pin 16 into the pin hole 32 of the jig to position the rotating shaft and the driving pin with respect to the jig, , stator yoke positioning pin 3
3 and the rotor yoke positioning pin 34 are inserted into the corresponding bearings and insertion holes to position the drive pin 16 and the PG pickup 18. A disk characterized in that the PG magnet 17 and the PG pickup 18 are positioned by inserting a rotor yoke positioning pin 34 into a rotary shaft mounting hole and a pin insertion hole 39 provided in the rotor yoke 9, respectively. How to assemble the drive motor.