JP2559224Y2 - Spindle motor - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a magnetically attracting disk (recording medium) for recording and reading signal information.
The present invention relates to a spindle motor having a rotor for supporting and rotating, and is particularly effective when used as a drive source for information processing, audio and video equipment, and the like.

[0002]

2. Description of the Related Art A conventional spindle motor will be described below.

FIG. 2 is a sectional view showing the structure of a conventional spindle motor. In FIG. 2, reference numeral 1 denotes a driving magnet magnetized to a plurality of poles, and a rotor formed by pressing a ferromagnetic iron plate. A height positioning protruding portion 2c of the drive magnet 1 is protruded into a plurality of locations on the inner diameter side of the frame 2 by a rotor frame forming press die, and the drive magnet 1 is bonded and fixed.

A metal turntable 3 is formed by cutting a copper or duralumin alloy or the like, and is fixed to the upper portion of the rotor frame 2 by bonding or press fitting. Reference numeral 10a denotes a disk on which signal information is recorded, which is formed integrally with a clamp plate 10b made of a magnetic material, centered on a spindle shaft 4 press-fitted and fixed to the rotor frame 2, and magnetized to a plurality of poles. The clamp magnet 11 is magnetically attracted, and the metal turntable 3
Closely attached and fixed.

The clamp magnet 11 is fitted and centered by the shaft press fitting outer diameter portion 2a of the rotor frame 2. 5a and 5b support the spindle shaft 4 with bearings. Reference numeral 6 denotes an armature winding which forms a stator with the stator core 7 and is arranged at a height opposite to the drive magnet 1 to apply a rotational force to the drive magnet 1.
A motor housing 12 holds and fixes the bearings 5a and 5b and the stator. Numeral 8 denotes a Hall element which is opposed to the end face of the drive magnet 1 and a plurality of which are arranged on the stator substrate 9 with a fixed phase between slots of the stator core 7. The stator substrate 9 is fixed to the motor housing 12 with mounting screws 13.

[0006]

However, in the above-mentioned conventional structure, the turntable 3 itself has to be manufactured in a ring shape from a high cost copper or duralumin rod or the like by cutting. In addition, the protrusion 2c for positioning the height of the drive magnet 1 with respect to the rotor frame 2 requires a step for forming the protrusion 2c in the press die for forming the rotor frame to be added to the mold. This was a factor in increasing the cost of mold production.

In addition, since the height positioning protrusion 2c of the drive magnet 1 is protruded from the rotor frame 2 by a metal mold, distortion is easily generated in a perfect circle, and the whole balance is broken, which is one of the causes of vibration. I was

Further, since the centering of the clamp magnet 11 is performed at the inner diameter portion of the clamp magnet 11, the inner diameter of the clamp magnet 11 needs to be matched with the shaft press-fitting outer diameter portion 2a of the rotor frame 2. The inner diameter of the magnet 11 must be made smaller than necessary, and the material cost increases due to the increase in the weight of the clamp magnet itself.

For the above reasons, the conventional configuration has a problem that the spindle motor has a high assembly man-hour and a high component processing cost.

The present invention solves the above-mentioned conventional problems. By forming a turntable on the top surface of a rotor frame with a resin, the material cost of the turntable, the number of assembling steps, and the height positioning step of the drive magnet are processed. It is an object of the present invention to provide a spindle motor capable of reducing cost and material cost of a clamp magnet.

[0011]

According to the present invention, a disk-shaped disk mounted on a top surface is rotated to achieve the above object.
An annular turntable that supports as much as possible and this turn
It is located inside the inner diameter of the table and mounted on the top.
Clamp magnet for adsorbing and fixing disks
Cylindrical rotor frame to which the drive magnet is fixed
And a stator core fixed to the motor housing.
In the spindle motor obtained, the rotor frame
Insert the turntable with resin on top
Molded to integrate rotor frame and turntable
And the clamp on the inner surface of the turntable.
It comes into contact with the outer peripheral surface of the magnet and
To position the turntable in the radial direction of the turntable
In addition to integrally molding the step portion for dispensing with resin,
Inserting a turntable into the rotor frame
The part is in contact with the upper surface of the drive magnet
Gnet in the height direction of the stator core
Height step for positioning is integrated with resin
It is characterized by being shaped .

[0012]

According to the present invention , on the top surface of the rotor frame,
The turntable is insert molded with resin and the rotor
By integrating the frame and turntable into one structure
The turntable itself is made of inexpensive resin.
You. In addition, clamp magnets are attached to the inner surface of the turntable.
Abut the outer circumference of the
For centering the worktable in the radial direction
Clamping is achieved by integrally molding the step with resin.
Turn the outer circumference of the magnet as a reference for positioning.
Clamping is performed by the centering step formed integrally with the table.
Positioning the magnet in the radial direction with high accuracy
it can. In addition, the turntable
Contact the top of the drive magnet with the insert
In the height direction of the stator core with respect to the dynamic magnet
Height step for positioning is integrated with resin
Shape allows the height positioning step to protrude and
Without forming it on the side of the rotor frame
Because it can be integrated with the turntable,
The drive magnet is moved by the positioning step to the stator.
Positioning can be performed accurately in the height direction of the core.
Therefore, with this structure, it is possible to reduce the number of assembly steps and to provide a spindle motor with a low component addition cost.

[0013]

FIG. 1 is a sectional view showing the construction of an embodiment of the present invention. In FIG. 1, 2b of a rotor frame 2 is a resin fixing hole opened in the rotor frame 2 in a plurality, and 3a is a resin turning hole. The table has a stepped portion 3b for height positioning of the drive magnet 1 and a stepped portion 3c for centering the clamp magnet 11, which are integrally formed. In the other drawings, the same or corresponding components as those of the conventional example shown in FIG. 2 are denoted by the same reference numerals, and redundant description will be omitted.

Next, the formation of the resin turntable 3a, the step 3b for positioning the height of the drive magnet 1, and the step 3c for centering the clamp magnet 11 will be described.

First, a resin turntable 3a is insert-molded in an annular shape with an inexpensive resin on the top surface of a rotor frame 2 formed by pressing an iron plate.
The rotor 2 and the turntable 3a have an integral structure. At the same time, a part of the resin is diverted to the inner diameter of the rotor frame 2 and a step 3b for positioning the height of the drive magnet 1 is formed. Clamp magnet 11 is attached to the inner diameter of table 3a.
Are formed integrally with each other.

The step 3b for positioning the height of the drive magnet 1 is formed with a plurality of resin fixing holes 2b formed in the rotor frame 2 in order to form the resin turntable 3a into the rotor frame 2. The same resin as the table 3a is poured into the inner diameter side of the rotor frame 2 and is integrally formed with the resin turntable 3a so that the height of the drive magnet 1 can be fixed to a position where the height of the drive magnet 1 is fixed with respect to the stator core 7. .

The centering step 3c of the clamp magnet 11 is formed by connecting the resin turntable 3a to the rotor frame 2.
Insert molding on resin and turntable 3 made of resin
By forming a step on the inner diameter surface of a, the centering positioning with respect to the spindle shaft 4 is performed on the outer periphery of the clamp magnet 11.

[0018]

According to the present invention, the top surface of the rotor frame is provided.
Above, insert the turntable with resin
The rotor frame and the turntable must be integrated.
With this, the turntable itself is molded with inexpensive resin
Because the high cost duralumin, to fabricate the turntable from copper rod like cutting and to be able to reduce the material cost without also fastening steps of the turntable and b <br/> Tafure arm It can be omitted.

In the rotor frame of the turntable,
Abut on the top of the drive magnet
To the driving magnet in the height direction of the stator core.
The height positioning step is made of resin.
Projected height positioning step due to body molding
Should not be formed on the side of the rotor frame
It can be integrated with the turntable
Then, the drive magnet is
Positioning can be performed accurately in the height direction of the taco,
Reduced cost of rotor frame forming press dies
It becomes, and distortion to the true circle can be eliminated even vibration generation due to the unbalancing of the entire rotor frame caused by the projecting processing of a plurality of locations at press working Rotafure arm.

In addition, a clamp is provided on the inner surface of the turntable.
To the clamp magnet
Position in the radial direction of the turntable
By molding the step for centering integrally with resin,
Use the outer circumference of the clamp magnet as the reference for positioning.
To the centering step formed integrally with the turntable.
More precise positioning of the clamp magnet in the radial direction
The inner surface of the clamp magnet
As compared with the case of positioning in the radial direction with reference class <br/>Npumagune' preparative inner diameter need not be reduced more than necessary for.

As is apparent from the above description, a turntable with reduced cost can be provided by insert-molding the turntable on the rotor frame with resin, and the man-hour for fastening the turntable and the rotor frame and the height of the drive magnet can be reduced. The cost of forming the positioning step and the cost of the clamp magnet are reduced, and an inexpensive spindle motor as a whole can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a spindle motor according to an embodiment of the present invention;

FIG. 2 is a configuration sectional view of a conventional spindle motor.

[Explanation of symbols]

1 ... drive magnet, 2 ... rotor frame, 2a ...
Shaft press-fit outer diameter portion, 2b: resin fixing hole, 2c: drive magnet height positioning protrusion, 3: metal turntable, 3a: resin turntable, 3b: drive magnet height positioning step, 3c: clamp Step for magnet alignment, 4 ... Spindle shaft,
5a, 5b: bearing, 6: armature winding, 7: stator core, 8: hall element, 9: stator board,
10a… Disc, 10b… Clamp plate, 11… Clamp magnet, 12… Motor housing, 13… Mounting screw.

Claims (1)

(57) [Scope of request for utility model registration] 1. A disk-shaped disk mounted on a top surface
An annular turntable rotatably supported and this
Placed inside the inner diameter of the turntable and mounted on the top surface
Clamp magnet that sucks and fixes the disc
Cylindrical rotor frame with driving magnet fixed to the surface
And the stator core fixed to the motor housing.
In the spindle motor provided , the turntable is mounted on a top surface of the rotor frame.
Rotor frame and turn by insert molding with resin
The turntable has an integral structure, and the inner surface of the turntable has the clamp magnet
Abut the outer circumference of the
For centering the worktable in the radial direction
The step is integrally molded with resin and the turn
In the insert part of the table into the rotor frame
Is in contact with the upper surface of the drive magnet
Position of the stator core in the height direction with respect to the
Height difference step is molded integrally with resin
Spindle motor, characterized in that.