JPH04118748U - brushless motor stator - Google Patents

Abstract

(57) [Summary] [Structure] A hub 5 that supports a rotor 4 via a bearing 3 and a stator core 6 are fixed to a printed circuit board 2, and a bent portion 61 is provided on the outer periphery of the stator core 6. A slot 62 opening on the outer periphery is provided to accommodate the stator winding 7. A winding terminal 71 of the stator winding 7 is soldered to the printed circuit board 2, a yoke portion 63 is formed inside the slot 62, and a through hole 64 is provided inside the yoke portion 63. The yoke portion 63 in contact with the outer periphery of the through hole 64 is bent in the axial direction to form a bent portion 65. [Effect] The yoke part is bent in the axial direction to ensure the cross-sectional area of the yoke part that forms the magnetic circuit, while the through holes are enlarged, making it easy to connect the winding ends even if the brushless motor is downsized. can.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a brushless motor for driving spindles of magnetic storage devices, etc. This invention relates to a stator for a flat brushless motor.

0002

[Conventional technology]

Recently, there has been a trend toward smaller and thinner magnetic storage devices, especially those that drive floppy disks. There is a strong demand for brushless motors for driving spindles. Therefore, rotation The stator core is formed flat, and the stator core is thin in the axial direction. However, even if the stator core is thinned, the area facing the magnet is maintained and the magnetic flux to the stator core is To ensure the inflow amount, the outer periphery of the stator core is bent in the axial direction, and the ribs are placed outside the core. A structure formed around the periphery has been disclosed (for example, Japanese Utility Model Application Publication No. 64-54744). . As shown in FIG. 3, the specific configuration is to drive and control the brushless motor 1. A rotor 4 is supported via a bearing 3 on a printed circuit board 2 on which an electronic circuit is mounted. A hub 5 and a stator core 6 are fixed. A bent portion 61 is provided on the outer periphery of the stator core 6. is formed, and a slot 62 opening on the outer periphery is provided as shown in FIG. The stator winding 7 is installed in the slot 62, and the winding terminal 71 of the stator winding 7 is soldered to the printed circuit board 2. There is a magnetic circuit inside the slot 62. A through hole is formed inside the yoke part 63 to solder the winding terminal 71. 64 is provided to accommodate a soldering iron. 8 is stator core 6 and pudding 9 is a spacer provided between the rotor 4 and the rotor 4, and the bent portion This is a magnet facing 61.

0003

[Problem that the idea aims to solve]

However, in the above configuration, the magnetic circuit of the yoke portion 63 is fixed while ensuring its cross-sectional area. When downsizing a brushless motor by reducing the diameter of the stator core 6, the diameter of the through hole 64 is reduced. Since the radial length cannot be made large, there must be enough space to insert the soldering iron. However, the disadvantage is that it takes time and effort to connect the winding ends. This invention makes it easy to connect the winding terminals while ensuring a sufficient cross-sectional area for the magnetic circuit. The purpose of this invention is to provide a small brushless motor that can

0004

[Means to solve the problem]

This invention connects the hub that supports the rotor through bearings, the stator core, and the printed circuit board. A bent portion is provided on the outer periphery of the stator core, and an opening is provided on the outer periphery. A slot is provided in which the stator winding is installed, and the winding terminal of the stator winding is connected to the pre-loaded slot. a yoke portion is formed inside the slot, and the yoke portion is soldered to a component board. In a brushless motor stator that has a through hole inside, the outer periphery of the through hole The bent portion is formed by bending the yoke portion in contact with the yoke portion in the axial direction.

[0005]

[Effect]

The yoke part touching the outer periphery of the through hole is bent in the axial direction to form a bent part, and the magnetic The cross-sectional area of the yoke that forms the air circuit is secured, and the radial length of the through hole is large. Because it is made smaller, it will be possible to fit a soldering iron, etc., and the stator This makes it easier to connect the winding ends of the windings.

[0006]

【Example】

An embodiment of the present invention shown in the drawings will be described. FIG. 1 is a side sectional view showing an embodiment of the present invention, in which a brushless motor 1 is driven and controlled. A rotor 4 is supported via a bearing 3 on a printed circuit board 2 on which an electronic circuit is mounted. The hub 5 and the stator core 6 are fixed, and a bent portion 61 is provided on the outer periphery of the stator core 6. At the same time, a slot 62 opening on the outer periphery is provided to attach the stator winding 7, and the stator The winding terminal 71 of the winding 7 is soldered to the printed circuit board 2 and placed inside the slot 62. The basic structure in which a yoke portion 63 is formed and a through hole 64 is provided inside the yoke portion is the same as the conventional example. Almost the same. What is different from the conventional method is that the yoke portion 63 in contact with the outer periphery of the through hole 64 is bent in the axial direction. This is the point where the bent portion 65 is formed. Therefore, the cross-sectional area of the yoke portion 63 remains the same, but the radial length of the through hole 64 remains the same. Because it is larger, a soldering iron can fit inside it, and even if it is miniaturized, the winding terminal can be easily inserted. This makes the joining process easier.

[0007]

[Effect of the idea]

As described above, according to the present invention, the diameter of the through hole can be changed without changing the cross-sectional area of the yoke part. Since the length in the direction can be increased, even when brushless motors are downsized, they can be easily handled. The iron can now fit into the winding joint, making it easier to join the winding ends. effective. In addition, a bent portion 61 on the outer periphery of the stator core 6 and a bent portion 65 on the yoke portion are Since the stator core 6 is formed, multiple stator cores are stacked in the manufacturing process of the stator core 6. In this case, there is less deformation of the stator core than in the conventional case where only the outer circumference is bent. This has the effect of maintaining quality.

[Brief explanation of drawings]

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

FIG. 2 is a plan view of the stator core of the present invention.

FIG. 3 is a side sectional view showing a conventional example.

FIG. 4 is a plan view of a conventional stator core.

[Explanation of symbols]

1 Brushless motor 2 Printed circuit board 3 Bearing 4 Rotor 5 hub 6 Stator core 61, 65 Bend part 62 slots 63 Yoke part 64 Through hole 7 Stator winding 71 Winding terminal 8 Spacer 9 magnet

Claims (1)

[Scope of utility model registration request] Claim 1: A hub that supports a rotor via a bearing and a stator core are fixed to a printed circuit board, and a bent portion is provided on the outer periphery of the stator core, and a slot opening is provided on the outer periphery, and the stator core is fixed to a printed circuit board. Fixing a brushless motor in which a winding is installed, a winding terminal of the stator winding is soldered to the printed circuit board, a yoke part is formed inside the slot, and a through hole is provided inside the yoke part. What is claimed is: 1. A stator for a brushless motor, characterized in that a yoke portion in contact with an outer periphery of the through hole is bent in the axial direction to form a bent portion.