JP3504743B2 - Spindle motor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle motor incorporated in various office automation equipment and the like for rotating a recording disk such as a magnetic disk.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional spindle motor has a fixed shaft 1 installed on a bracket 11.
A rotor hub 3 rotatably supported on the fixed shaft 1 via a pair of bearings 2 and 2 and a rotor hub 3 mounted on the outer periphery of the fixed shaft 1 between the bearings 2 and 2 via a pair of O-rings 4 and 4. A stator 5; an annular rotor magnet 16 fixed to the inner peripheral surface of the rotor hub 3 via a yoke 15 so as to face the outer periphery of the stator 5; and an annular ring that prevents the stator 5 from rotating with respect to the fixed shaft 1. The holder 6 and the like are provided. The holder 6 is integrally formed with a key projection, and has an axial coil wire lead-out groove 9 formed on the outer circumference of the lower half of the fixed shaft 1 and a key on the inner circumference of the stator 5 facing the groove 9. The rotation of the stator 5 can be prevented by fitting the protrusion across the groove.

Coil wire 7 drawn from the stator 5
Is covered with an insulating tube 8 and led out to the outside through a lead-out groove 9 in the previous period, and a bracket 11 is provided outside the motor.
It was soldered to the terminal portion of the control circuit side FPC 10 provided on the bottom surface of the.

Further, the stator 5 is fixed to the fixed shaft 1 by a pair of O-rings 4 and 4 in a state of being slightly floated from the fixed shaft 1, and the vibration generated from the stator 5 when the motor is rotating causes the O-rings 4 and 4. 4 is absorbed and is transmitted to the fixed shaft 1, that is, the fixed side, to a minimum.

[0005]

In the spindle motor having such a structure, at the time of assembly, the coil wire 7 drawn out from the stator 5 is covered with an insulating tube 8 and is externally exposed through the coil wire lead-out groove 9. Derive and then F
A series of work of soldering to the terminal part of the PC 10
Each one had to be done individually, which was troublesome.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a spindle motor which can be easily assembled.

[0007]

In order to achieve the above object, a spindle motor according to the present invention comprises a fixed shaft, a rotor hub rotatably supported on the fixed shaft via a pair of bearings, and the fixed shuff. a stator which is attach to the outer periphery of bets, an annular rotor magnet wherein fixed to the rotor hub so as to face the stator, respectively and engaged with the stator and the stationary shaft said with respect to the fixed shaft In a spindle motor including a holder for stopping rotation of a stator, coil wires led out from the stator are collectively soldered to a coil wire drawing FPC inside the motor, and the FPC is
It is characterized in that it is sandwiched between the fixed shaft and the holder and fixed inside the motor.

Further, the FPC, when it is necessary to connect the control circuit side of the FPC at the outside of the motor, it is desirable to connect the terminal portions each other directly soldered to.

[0009]

In the above-described spindle motor of the present invention, the coil wires drawn from the stator are collectively soldered to the coil wire drawing FPC, and the coil wire drawing FPC prevents the stator from rotating. It is fixed inside the motor using a holder that does. Therefore, there is no conventional series of troublesome work such as covering each coil wire with an insulating tube, passing through the coil wire lead-out groove, leading out to the outside of the motor and soldering to the FPC on the control circuit side. And can be done easily. In addition, F for coil wire drawing
Since the PC is fixed to the fixed shaft by using the holder for the rotation prevention of the stator, it is not necessary to prepare a member for fixing the FPC. Further, the lead-out portion of the FPC for drawing the coil wire outside the motor is directly connected to the control circuit side FPC outside the motor by its terminal portion, so that the motor assembling work can be simplified.

[0010]

Embodiments of the present invention will be described with reference to the drawings. It is to be noted that the same numbers as those in the conventional example of FIG. 5 are the same as or equivalent to those in the conventional example. FIG. 1 is a sectional view of a spindle motor as a first embodiment of the present invention. The fixed shaft 1 is made of, for example, an iron material and has a cylindrical shape. The bracket 11 is formed in a dish shape having a substantially concave cross section, and has a fitting hole 11a in the center.
The lower end 1a of the fixed shaft 1 is press-fitted and fixed in the fitting hole 11a, and the fixed shaft 1 is supported by the bracket 11. These fixed shaft 1 and bracket 11
Is a stationary member with respect to the rotor hub 3 to which a magnetic disk (not shown) is mounted.

The rotor hub 3 is made of, for example, an aluminum material and has a substantially cylindrical shape. A substantially cylindrical yoke 15 is attached to the inner peripheral surface of the rotor hub 3 so as to cover the inner peripheral surface thereof.
A cylindrical rotor magnet 16 is attached so as to face the stator 5. The rotor magnet 16 and the stator 5 are positioned so that their magnetic centers coincide with each other.

A pair of bearings 2 and 2 are vertically mounted on the fixed shaft 1 as bearing means. The outer ring portion of the upper bearing 2 is fixed to the upper inner peripheral surface of the yoke 15, and the outer ring portion of the lower bearing 2 is connected to the yoke 1 via an annular bush 17.
The rotor hub 3 is fixed to the lower inner peripheral surface of the rotor 5, and is rotatably supported by the fixed shaft 1 via a pair of bearings 2 and 2.

The annular bush 17 fixed to the lower end portion of the yoke 15 fits with the bracket 11 with a slight gap, and forms a labyrinth structure with each other.

A magnetic fluid seal device 18 is arranged at the upper end of the rotor hub 3, and the rotor hub 3 and the fixed shaft 1 are provided.
The space between and is sealed airtight. Magnetic fluid seal device 1
The numeral 8 prevents dust and dirt from the inside of the motor, for example, grease and the like from the pair of bearings 2 and 2 from scattering to the outside of the motor.

On the upper side of the magnetic fluid seal device 18, there is provided a seal cap 19 that covers between the inner peripheral end of the rotor hub 3 and the outer peripheral upper end of the fixed shaft 1. The seal cap 19 is a magnetic fluid. At the same time as protecting the seal device 18, the magnetic fluid is prevented from scattering from the seal device 18 to the outside of the motor.

The stator 5 is attached to the fixed shaft 1 via a pair of O-rings 4 and 4 provided on the upper and lower outer circumferences of the fixed shaft 1, and is fixed by the elastic force of the pair of O-rings 4 and 4. It is slightly above the shaft 1. A holder 13, which will be described in detail later, is provided at a lower end portion of the stator 5 to prevent the stator 5 from rotating with respect to the fixed shaft 1.

The O-ring 21 provided on the outer periphery of the fixed shaft 1 is in contact with the upper end of the stator 5 attached to the fixed shaft 1 as described above, and the O-ring 21 has a spacer above the O-ring 21. It is retained by a C ring 23 via 22. Therefore, C ring 2
Due to the elastic force exerted below the O-ring 21 urged by 3, the stator 5 is securely fixed to the fixed shaft 1 in the axial direction.

As shown in FIG. 3, the holder 13 has a substantially cylindrical shape, and one or more protrusions 24 are provided on the upper circumference thereof. Further, the inner peripheral stepped portion 13a of the holder 13 is provided with one or more semicircular arc-shaped convex portions 25.

The holder 13 is fixed by fitting the inner peripheral stepped portion 13a to the stepped portion 1b for positioning the bearing of the fixed shaft 1, and the above-mentioned protruding portion 24 is fitted in the key groove 5a provided in the inner peripheral portion of the stator 5. Inset. Also, the semi-circular convex portion 2
5 is fitted with the convex portion 25 on the step portion 1b of the fixed shaft 1 and is fitted into the concave groove 26 formed by one or more. Therefore, the stator 5 and the fixed shaft 1 are fixed via the holder 13 by the projecting portion 24 and the convex portion 25, and the stator 5 is completely prevented from rotating with respect to the fixed shaft 1.

A fixed groove 14 is formed on the outer periphery of the fixed shaft 1 between a pair of O-rings 4 and 4. The fixed groove 1 is elastic as an adhesive for fixing the stator 5 to the fixed shaft 1. The adhesive 20 is filled. As a result, the elastic adhesive 20 has a function of absorbing the vibration generated from the stator 5 when the motor rotates, so that the stator is more effective than when only the pair of O-rings 4 and 4 is interposed between the stator 5 and the fixed shaft 1. The vibration on the fixed side due to the vibration from 5 can be further prevented.

The coil wire 7 derived from the stator 5 is
Inside the motor, they are collectively soldered to the substantially T-shaped coil wire drawing FPC 12 shown in FIG. And
The FPC 12 for drawing the coil wire is fixed inside the motor by sandwiching the fixed portion 12a above the chain line between the stepped portion 1b of the fixed shaft 1 and the holder 13. The fixed FPC 12 for pulling out the coil wire is led out to the outside of the motor from the lead-out groove 27 formed in the fixed shaft 1 at the lead-out portion 12b.

The lead-out portion 12b led out of the motor is
Control circuit side FP mounted on the bottom surface of the bracket 11
It is directly connected to C10. That is, the connection method will be described in detail with reference to FIG. 4. The control circuit side FPC 10 and the coil wire drawing FPC 12 are respectively the base film 10
The copper foils 10b and 12b are patterned on the a and 12a, and the upper surfaces of the copper foils 10b and 12b are covered with carver films 10c and 12c.
Solders 10e and 12e are pre-deposited on d. Further, a through hole 12f is formed at the position of the terminal portion 12d in the base film 12a and the copper foil 12b of the coil wire drawing FPC 12. The two FPCs 10 and 12 are brought into contact with their terminal portions 10d and 12d facing each other. Then, a thermoconducting pin 28 such as a soldering iron is inserted through the through hole 12b, and heat is sent to both solders 10e, 12e.
Melt and connect.

Therefore, the coil wires 7 led out from the stator 5 are collectively soldered to the coil wire lead-out FPC 12, and the FPC 12 is further connected to the control circuit side FP outside the motor.
Since it is directly connected to the C10, the coil wire connection work until soldering to the FPC 10 on the control circuit side outside the motor can be collectively performed. Further, the FPC 12 for drawing out the coil wire, when the stator 5 is fixed around the fixed shaft 1 by stopping rotation,
Since it is fixed by the holder 13, the coil wire drawing F
The work of attaching the PC 12 can be simplified.

Although the embodiment of the spindle motor according to the present invention has been described above, the present invention is not limited to the embodiment and various modifications and corrections can be made without departing from the scope of the present invention .

[0025]

Since the present invention is constructed as described above, it has the following effects. The coil wire pulled out from the stator 5 is collectively F
This FPC12 can be soldered to PC12 and
Since the holder 13 having the function of preventing the stator 5 from rotating with respect to the fixed shaft 1 can be sandwiched and fixed between the fixed shaft 1 and the fixed shaft 1, individual coil wires inside the motor can be easily and collectively processed. Assembling work can be simplified. In addition, F for coil wire drawing fixed in the motor
If the PC 12 is pulled out to the outside of the motor and the terminal portion and the terminal portion of the FPC 10 on the control circuit side outside the motor are directly soldered, the connection work of the FPC is facilitated and the assembling work is further simplified. Is obtained.

[Brief description of drawings]

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

2 is a plan view of the FPC for drawing a coil wire in FIG. 1. FIG.

3 is a cross-sectional view of the holder in FIG.

FIG. 4 is a partially enlarged view illustrating a method of connecting the control circuit side FPC and the coil wire drawing FPC in FIG.

FIG. 5 is a half sectional view showing a conventional spindle motor.

[Explanation of symbols]

1 fixed shaft 2 bearings 3 rotor hub 4 O-ring 5 Stator 7 coil wire 10 Control circuit side FPC 10a terminal part 12 FPC for coil drawing 12a terminal part 13 Holder 14 Tamari groove 16 rotor magnet 20 Elastic adhesive

Front page continuation (51) Int.Cl. ⁷ identification code FI H02K 21/22 H02K 21/22 M (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 3/04 H02K 3/50 H02K 5 / 173 H02K 5/22 H02K 5/24 H02K 21/22

Claims (2)

(57) [Claims] 1. A fixed shaft and a pair on the fixed shaft
The rotor hub that is rotatably supported through the bearings of
The stator attached to the outer periphery of the fixed shaft,
Fixed to the rotor hub so as to face the stator
Annular rotor magnet, the stator and the fixed
Lock the shafts respectively and move forward with respect to the fixed shaft.
Spindle equipped with a holder that prevents the stator from rotating.
In Le motor, The coil wire derived from the stator is inside the motor.
It is soldered to the FPC for coil wire drawing at once.
The FPC is sandwiched between the fixed shaft and the holder.
And is fixed inside the motor.
Noodle motor. 2. The FPC is controlled outside the motor.
The FPC on the circuit side and its terminals are directly soldered together.
2. The spindle motor according to claim 1, wherein the spindle motor is connected to each other.