JP2000060097A - Spindle motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance workability of connecting the coil wires of a stator to an external circuit by facilitating to drawing out the coil wires. SOLUTION: This spindle motor comprises a hub 10 supported on a shaft 4 secured in a bracket 2 through a pair of bearings 6 and 8, in such a manner that the hub 10 is freely rotatable, a stator 14 secured on the shaft 4 in such a manner that the stator faces opposite to the rotor magnet 12 installed on the hub 10, and a circuit board 18 which is placed under the bracket 2 and to which the coil wires 14b of the stator 14 are to be connected. A hole 4a which is open downward is formed in the shaft 4. A connector-like connecting device 16, to which the ends 4c of the coil wires 4b are to be connected, is fit in the hole 4a, and furthermore connector-like terminal portion 20 mounted on a circuit board 18 is inserted into the hole 4a in the shaft 4 through the opening and connected to the connecting device 16, in such a manner that the terminal portion is freely detachable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a spindle motor suitable for rotating a magnetic disk in a hard disk drive or the like.

[0002]

2. Description of the Related Art As a conventional spindle motor of this type, for example, the one shown in FIG. 3 is known. That is,
A circular bracket A fixed to the apparatus comprises a bracket body B and a cylindrical portion C erected at the center thereof, and is integrally formed with the center of the hub E via a pair of bearings D inside the cylindrical portion C. The provided shaft F is rotatably supported, the stator G is externally fixed to the outer peripheral surface of the cylindrical portion C, and the annular rotor magnet H faces the stator G on the inner peripheral surface of the outer peripheral wall of the hub E. Is mounted as follows. A magnetic disk is mounted on the hub E.

[0003] A flexible circuit board I is attached to the upper surface of a bracket body B of the bracket A, and an end L of a coil wire K of a stator G is soldered to a terminal J on the flexible circuit board I. A lead portion M of the substrate I is drawn out through a lead hole N formed in the bracket A and connected to an external circuit. O
Denotes a solder in which the end L of the coil wire K is connected to the terminal J of the flexible circuit board I.

[0004] In such a spindle motor,
A magnetic disk is mounted on the hub E, drive power is supplied from an external circuit to the coil wire K of the stator G via the flexible circuit board I, and the hub E causes the shaft F to rotate by the electromagnetic interaction between the stator G and the rotor magnet H. The magnetic disk rotates together with the hub E.

[0005]

The above-described conventional spindle motor has the following problems to be solved. That is, although the flexible circuit board I is used to connect the coil wire K of the stator G to an external circuit, the flexible circuit board I is mounted on the bracket body B of the bracket A, that is, on the surface inside the motor, and Since the terminal portion J of the flexible circuit board I is disposed immediately below the stator G and the end portion L of the coil wire K is soldered to the terminal portion J, the space for connecting the coil wire is very narrow, and the workability is poor. In addition, there is a problem that dust such as flux at the time of soldering easily floats inside the motor, resulting in deterioration of quality. In addition, a flexible circuit board I used for connection to an external circuit
Is built in the motor, so that the assembly of the motor and the connection of the flexible circuit board I to the external circuit cannot be performed at the same time, and there is a problem that the assembling workability is deteriorated.

In another conventional spindle motor, a coil wire of a stator supported by a shaft is led out from a lower end of the shaft through a hollow portion formed inside the shaft, and the end of the coil wire is soldered to a circuit board or the like. Some are connected by. However, in this type of spindle motor, the end of the coil wire protrudes from the shaft, which hinders the assembling during mounting of the bearing, press-fitting of the shaft, and the like, resulting in deterioration of workability.

SUMMARY OF THE INVENTION The present invention has been made in consideration of such problems of the prior art, and an object of the present invention is to easily pull out a coil wire of a stator and connect it to an external circuit. An object of the present invention is to provide a spindle motor capable of significantly improving the workability for connection.

[0008]

In order to achieve the above object, in a spindle motor according to the present invention, a hub rotatably supported on a shaft fixed to a bracket via a pair of bearings, and a hub mounted on the hub. A hole fixed to the shaft, the stator being fixed to the shaft so as to face the mounted rotor magnet, and a circuit board arranged on the side of the bracket opposite to the hub and connected to the coil wire of the stator; By forming a connector-like connector in which the end of the coil wire is connected to the hole, a connector-like terminal mounted on the circuit board is inserted into the hole of the shaft from the opening. It is characterized by being detachably connected to a connection tool.

In the above-described structure, the motor coil is assembled by connecting the coil wire of the stator fixed to the shaft to the connector mounted on the shaft, and the terminal is connected to the circuit board. By inserting the portion into the hole of the shaft and connecting to the connector, the connection of the coil wire of the stator to the circuit board is completed. In this case, since the connecting portion between the coil wire of the stator and the connecting tool is housed in the hole of the shaft, it is not exposed to the inside of the motor, so that the dust generated from the connecting portion floats inside the motor. And quality can be prevented from deteriorating.
In addition, it is possible to individually assemble the motor portion and connect the terminal portions of the circuit board in parallel.

In the spindle motor described above, the hub is interposed between the inverted cup-shaped hub body whose one end portion inner periphery is supported by one bearing and the other end portion inner periphery of the hub body. The bush member is used to fix the stator to the shaft between the two bearings, and the end of the coil wire of the stator is introduced into a hole through a through hole formed in the shaft.

[0011] A female contact pin is provided on one of the connector mounted in the hole of the shaft and the terminal mounted on the circuit board, and a contact is provided on the other of the connector and the terminal. A male-type contact probe that comes into contact with the pins so as to freely contact and separate can be provided.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. FIG.
1 shows a cross-sectional configuration of a spindle motor. The base of a shaft 4 is fixed to the center of a circular thin dish-shaped bracket 2 attached to a device such as a hard disk drive, and a pair of bearings 6, 8 Through hub 1
0 is rotatably supported.

The shaft 4 is formed of a cylindrical body and has a hole 4a opened at the lower end formed therein.
A through-hole 4b communicating with the hole 4a is formed at a position corresponding to the space therebetween. The lower end opening of the shaft 4 is opened on the lower surface of the bracket 2. The hole 4a of the shaft 4
Should be at least continuous from the through hole 4b to the lower end.

The hub 10 has an upper inner periphery with an upper bearing 6.
And a ring-shaped bush member 10b interposed between the inner periphery of the lower end of the hub body 10a and the lower bearing 8;
An annular rotor magnet 12 is mounted on the inner surface of the outer peripheral wall of the hub body 10a.

In the hub 10, the rotor magnet 1 is provided.
2 fixed to the shaft 4 so as to face the shaft 2
Is housed. This stator 14 is a stator core 1
The stator core 14a is externally fixed to the shaft 4 between the bearings 6 and 8, and the end portion 14c of the coil wire 14b extends from the through hole 4b of the shaft 4 to the inside of the hole 4a. Has been introduced.

In the hole 4a of the shaft 4, a connector 16 is provided closer to the opening end than the through hole 4b. As is apparent from FIG. 1, the connecting tool 16 is arranged such that a plurality of (three in the figure) hollow pin-shaped female contact pins 16b vertically penetrate a circular connecting tool main body 16a made of synthetic resin. The ends 14c of the coil wires 14b introduced into the holes 4a are electrically connected to the upper ends of the contact pins 16b of the connecting tool 16 by soldering.

A circuit board 18 constituting a motor control circuit and the like is provided on the opposite side of the bracket 2 from the hub 10, that is, below, and a hole of the shaft 4 is provided at a position corresponding to the shaft 4 of the circuit board 18. The terminal portion 20 is provided in the portion 4a through the lower end opening. This terminal section 20
Is a circular terminal body 2 made of synthetic resin, as shown in FIG.
A plurality of (three in the figure) male contact probes 20b are held on the base plate 0a such that a portion thereof protrudes upward. The lower part of each contact probe 20b is electrically connected to the circuit board 18 (not shown). It is connected.

When a predetermined assembly of the device is completed, the terminal section 20 on the circuit board 18 is
And the respective contact probes 20b are fitted into the respective contact pins 16b of the connection tool 16 and are electrically connected. Thereby, each end 14 of the coil wire 14b is
c is electrically connected to the circuit board 18 via the connection tool 16 and the terminal section 20.

As shown in FIG. 2, the terminal portion 20 is provided with two positioning projections 20c at positions not interfering with the contact probe 20b. Although not shown, the connector 16 is formed with a recess (not shown) so as to face the connector. When the terminal 20 is connected to the connector 16, the projection 20 c of the terminal 20 fits into the recess of the connector 16. Is performed.

In the above-described embodiment, the spindle motor is a spindle motor in which the stator 14 fixed to the shaft 4 is arranged between the pair of bearings 6 and 8. However, the present invention is not limited to this. The present invention can be similarly applied to any type of spindle motor in which a stator is fixed to a fixed shaft that rotatably supports a hub.

In the above-described embodiment, the connecting tool 16 provided inside the shaft 4 has the female contact pin 16b.
Shows a case where a male contact probe 20b is provided on each of the terminal portions 20 mounted on the circuit board 18, but conversely, a male contact probe is provided on the connecting member 16 and the terminal portion 20 is provided. Female contact pins may be provided for the respective members.

[0022]

As described above, according to the spindle motor of the present invention, the connector for connecting the end of the coil wire of the stator to the hole of the shaft fixed to the bracket is mounted on the circuit board. Insert the terminal mounted on the shaft into the hole of the shaft, and detachably connect this to the connector,
Since the coil wire is connected to the circuit board via the connector and the terminal in the shaft, an effect that the electrical connection of the motor portion to the circuit board is very easily and reliably obtained. In addition, there is no soldering work in a very small space as in the past, and the connection workability is improved, and the connection part at the end of the coil wire is present inside the shaft and is not exposed inside the motor. It is possible to avoid the inconvenience that the inside of the motor is contaminated by dust such as flux at the solder connection portion and the quality is reduced. Furthermore, since the state in which the end of the coil wire is connected to the connector in the shaft can be maintained during the assembly, there is no need to perform the assembly with the coil wire being led out from the shaft, which has the effect of simplifying the assembly work. can get.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of a terminal section of FIG.

FIG. 3 is a partial sectional view showing a conventional spindle motor.

[Explanation of symbols]

 2 Bracket 4 Shaft 4a Hole 4b Through-hole 6,8 Bearing 10 Hub 10a Hub main body 10b Bush 12 Rotor magnet 14 Stator 14a Stator core 14b Coil wire 14c End 16 Connector 16b Contact pin 18 Circuit board 20 Terminal 20b Contact probe

Claims (3)

[Claims] A hub is rotatably supported on a shaft fixed to a bracket via a pair of bearings, and a rotor magnet is mounted on the hub so as to face a stator fixed on the shaft, and a coil wire of the stator is provided. A bracket that is connected to a circuit board disposed on the side of the bracket opposite to the hub, wherein the shaft has a hole formed in the circuit board side, and the coil wire is formed in the hole. A connector-like connecting part to which the end of the connector is connected is internally provided, and a connector-like terminal part mounted on the circuit board is inserted into the hole of the shaft from the opening and detachably connected to the connecting part. A spindle motor. 2. The hub according to claim 2, wherein the hub has an inverted cup-shaped body whose one end is supported by one of the bearings, and a bush interposed between the inner circumference of the other end of the hub and the other bearing. The spindle according to claim 1, wherein the stator is fixed to the shaft between the bearings, and a coil wire end of the stator is introduced into the hole through a through hole formed in the shaft. motor. 3. The connector according to claim 1, wherein one of the connecting member provided in the hole of the shaft and a terminal portion mounted on the circuit board includes:
3. A female contact pin is provided, and a male contact probe is provided on the other of the connecting tool and the terminal portion so as to be capable of coming into contact with and separating from the contact pin. Spindle motor.