JPH03277157A - Spindle motor - Google Patents

Abstract

PURPOSE:To enable a lead means to be introduced easily by providing a large- diameter part which fits one side of a bearing member to a standing spindle member and by forming a cut-out which extends in spindle direction at the above large-diameter part in a spindle motor of a magnetic disk device, etc. CONSTITUTION:A lower-edge part of a standing spindle member 2 is press-fit into a lower frame 4 and is fixed and an upper-edge part is fixed to an upper frame 6 by a mounting screw. A large-diameter part 40 is provided at a lower part of the spindle member 2 in one piece. A cut-out 42 with a nearly semi-circular section is formed on an outer-periphery surface of the large-diameter part 40. A bearing member 10 is fitted to an outer-periphery surface of the large- diameter part 40. The cut-out 42 is used as a space for introducing a lead-out wire 33 and connects a space within a hub member 12 to an outside. When fixing the stator 26 to the spindle member 2, a lead-out wire 33 from an armature coil 30 of a stator 26 is introduced to the outside through the cut-out 42 and a tip part of the lead-out wire 33 is connected to a terminal part 36 of a circuit substrate 34 by soldering.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a spindle motor for rotationally driving a recording member such as a magnetic disk.

[Traffic technology and its drawbacks]

A fixed shaft type spindle motor includes a stationary shaft member and a hub member rotatably attached to the stationary shaft member via a pair of bearing members. A rotor magnet is fixed to the inner peripheral surface of the hub member, a stator is disposed inside the rotor magnet, and a circuit means for controlling rotation of the hub member and the stator are attached to the shaft member. One end of the stationary shaft member is fixed directly or via a mounting bracket to, for example, a top frame of a drive device such as a disk, and optionally the other end of the stationary shaft member is also fixed to, for example, an upper frame of the drive device. be done.

However, in conventional spindle motors, a through hole extending in the axial direction is formed in the shaft member, and a lead wire from the circuit means is guided to the outside through the through hole. Therefore, there are problems that need to be solved, such as it is not easy to form the through holes and the work for leading out the lead wires is complicated.

[Purpose of the invention]

The present invention has been made in view of the above facts, and its main purpose is to provide an improved spindle motor in which the lead means can be led out relatively simply and easily.

[Summary of the invention]

According to the present invention, a stationary shaft member, a hub member rotatably attached to the stationary shaft member via a pair of bearing members, a rotor magnet attached to the hub member, and a rotor magnet that faces the rotor magnet. A spindle motor is provided with a stator arranged in a manner such that a portion of the stationary shaft member is provided with a large diameter portion having a larger outer diameter than the other portion, and one of the pair of bearing members is provided with a large diameter portion having a larger outer diameter than the other portion. The lead means is attached to the large diameter part, and the large diameter part has a lead-out space extending in the axial direction, and the lead means for supplying current to the stator is connected to the stator through the lead-out space of the large-diameter part. A spindle motor is provided, characterized in that the spindle motor is electrically connected.

[Specific examples of the invention]

Hereinafter, a specific example of a spindle motor according to the present invention will be described with reference to the accompanying drawings.

In FIG. 1, the illustrated spindle motor includes a stationary shaft member 2. As shown in FIG. In a specific example, the lower end of the stationary shaft member 2 is fixed to the lower frame 4 of a drive device for a recording member such as a magnetic disk by means such as press fitting, and the upper end of the shaft member 2 is fixed to the upper frame 4 of the drive device for a recording member such as a magnetic disk. (not shown). The lower end of the shaft member 2 may be attached to the lower frame 4 via a substantially disc-shaped mounting bracket, and the upper end of the shaft member 2 may not be fixed to the upper frame 6.

A hub member 12 is rotatably mounted on the stationary shaft member 2 via a pair of bearing members 8 and 10. Hub member 1
2 has a cylindrical main body 14 and an end wall 16 provided at one end of the cylindrical main body 14.

An annular flange 18 projecting radially outward is provided at the other end of the cylindrical body portion I4. In the specific example, the end wall 16 of the hub member 12 is rotatably supported via one of the bearing members 8, and the other end of the main body 14 of the hub member 12 is supported via the annular bushing member 20 and the bearing member lO. It is rotatably supported. Main body portion 14 of hub member 12
A hub member 12 is rotatably mounted on the inner peripheral surface (specifically, a portion between the end wall 16 and the bushing member 20).

A yoke member 22 is attached to the inner peripheral surface of the hub member 12,
An annular rotor magnet 24 is provided on the inner peripheral surface of the yoke member 22.
is installed.

A stator 26 is arranged inside the rotor magnet 24. The stator 26 has a stator core 28 attached to the intermediate portion of the shaft member 4 (a region between the pair of bearing members 8 and 10), and an armature coil 30 wound around the stator core 28. Further, on the outside of the other bearing member 10, a circuit means 32 for controlling the rotation of the hub member 12 is arranged. The circuit means 32 has a circuit board 34 fixed to the shaft member 4, and the circuit board 34 is provided with various electric elements for controlling the rotation of the rotor magnet 14. A lead wire 33 as a lead means from the armature coil 30 of the stator 26 is connected to the circuit board 3.
The circuit board 34 is electrically connected to a predetermined terminal section 36 on the circuit board 34 as described later, and the lead section from the circuit board 34 is connected to terminal means (not shown) of the drive device as described later.

In the spindle motor as described above, the hub member 1
A plurality of recording members (not shown) such as magnetic disks are mounted on the outer periphery of the hub member 2 in a stacked manner via spacer members, and the lowest recording member is placed on the flange 18 of the hub member 12. Then, the hub member 12 (together with the yoke member 22 and the rotor magnet 7) and the recording member are rotationally driven in a predetermined direction with respect to the shaft member 2 and the stator 26.

Next, with reference to FIG. 1 and FIG. 2, the manner in which the lead wire 33 as a lead means is led will be described.

In the specific example, the lower part of the shaft member 4 (more specifically, the stator 26
A large diameter portion 4° having a larger outer diameter than other portions is integrally provided at a portion below the mounting portion in Fig. 1). The large diameter portion 4o may be formed separately from the shaft member 2 and fixed to the shaft member 2 by means such as press fitting.

A notch 42 having a substantially semicircular cross section is formed in a part of the outer peripheral surface of the large diameter portion 4o, and the notch 42 extends in the axial direction from one end of the large diameter portion 42 to the other end. This large diameter part 4
As shown in FIG.
0 is installed. The notch 42 formed in the large diameter portion 4o is used as a lead-out space for the leader wire 33, and communicates the space inside the hub member 12 with the outside. When fixing the stator 26 to the shaft member 2, the lead wire 33 of the armature coil 3o of the stator 26 is led out through the lead-out space, and the tip of the lead wire 33 thus led out is connected to the terminal of the circuit board 34. 36 by means such as solder.

In the spindle motor as described above, the shaft member 2 is provided with a large diameter portion 40, and a lead-out space is created by forming, for example, a notch 42 in the large diameter portion 40.
Therefore, the lead-out space can be formed with simple machining, and the work of leading out the leader wire 33 through this lead-out space is also facilitated.

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

For example, in the specific example shown, the cutout is approximately circular, but the cutout is not limited to this, and the lead-out space may be formed by a cutout in a so-called character shape or a rectangular shape. Furthermore, when the large diameter portion can be made relatively large, a circular through hole or the like may be formed to define the lead-out space.

〔Effect of the invention〕

In the spindle motor of the present invention, the stationary shaft member is provided with a large diameter part, and the lead-out space is formed in this large-diameter part, so that the lead-out space can be formed with a simpler configuration than in the past and with simple machining. be able to. Further, since the lead means is led out to the outside through the lead-out space formed as described above,
can be easily derived.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a specific example of a spindle motor according to the present invention. 2 is a perspective view showing a stationary shaft member of the spindle motor of FIG. 1; FIG. 2...Stationary shaft member 4...Lower frames 8 and 10...Bearing member 12...Hub member 24...Rotor magnet 26...Stator 30...Amateur coil 33...Leader wire 40... Large diameter portion 42... Notch

Claims (1)

[Claims] 1. A stationary shaft member, a hub member rotatably attached to the stationary shaft member via a pair of bearing members, a rotor magnet attached to the hub member, and a rotor magnet attached to the hub member. and a stator disposed facing each other, a part of the stationary shaft member is provided with a large diameter part having a larger outer diameter than the other part, and one of the pair of bearing members One of the lead means is attached to the large diameter portion, and a lead-out space extending in the axial direction is formed in the large-diameter portion, and a lead means for supplying current to the stator is connected to the large-diameter portion through the lead-out space. A spindle motor, characterized in that it is electrically connected to a stator.