JP2591448Y2 - Stator device for brushless 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 stator device for a brushless motor used in OA equipment or audio and video equipment.

[0002]

2. Description of the Related Art In recent years, there has been a demand for small and thin brushless motors used for various devices to meet the demand for small size. In particular, a disk device such as a floppy disk device is widely used as an information storage device, and there is a demand for development of a disk device having a heat of 2/3 inch and 1/2 inch particularly for a handy type A4 size computer. In response to such demands, especially for rotary drives,
There is a demand for a thinner.

Hereinafter, a conventional brushless motor for rotating a disk will be described with reference to a conventional brushless motor.

FIG. 5 shows the structure of a conventional brushless motor that drives a disk to rotate. 21 is a shaft, 22 is a spindle hub, 23 is a rotor frame, 2
4 is a drive magnet, 25 is a printed circuit board, 26 is a housing, 27 is a stator core, 28 is a ball bearing, 29
Is an oil-impregnated bearing, and 30 is a coil.

[0005] First, as the disk is inserted into the floppy disk device, the disk hub is magnetically attracted to the hub magnet 31, and at the same time, the shaft 21 is inserted into the motor shaft insertion hole of the disk hub. And
The drive pin 32 is inserted into the drive pin insertion hole, and while the motor starts to rotate and the rotor makes one rotation, the drive pin 32 is chucked in the drive pin insertion hole, and the disk rotates integrally with the rotor.

The rotor of the motor rotates smoothly around a shaft 21 supported by a ball bearing 28 and an oil-impregnated bearing 29, and a spindle hub 22 fixed by a shrink fitting method or the like is attached to the shaft 21. The rotor frame 23 is caulked and attached via the spindle hub 22. A main magnet 24 is adhered to the inner surface of the hanging portion of the cup-shaped rotor frame 23, and a frequency power generation magnet (hereinafter abbreviated as FG magnet) 33 is provided on the lower surface of the flange portion extending outward from the lower end of the hanging portion.
Is attached, frequency-magnetized magnetism is applied, and a power-generating wire element is arranged on the Punto substrate 25 facing the magnetized surface, and a generated voltage is generated as the motor rotates, and the voltage is generated by the motor control circuit. To control the motor at a constant speed.

In the motor stator, a coil 30 is wound around an insulated stator core 27 and a stator core 2 is fixed to a housing 26 to which a ball bearing 28 and an oil-impregnated bearing 29 are fixed.
7, and the housing 26 is caulked and fixed to the printed circuit board 25. A current is supplied to the coil 30 from the printed circuit board 25 and the stator core 27
A magnetic field is generated from the salient poles, and the rotor frame with the drive magnet 24 is rotated.

Assuming that the distance from the printed board of the motor to the top surface of the rotor frame is the motor height, the motor height in FIG. 5 is determined by the thickness of the printed board, the thickness of the wound coil on the printed board side, and the insulating material. The total thickness of the stator core including, the thickness of the wound coil on the hub magnet side, the thickness of the rotor frame, the gap between the rotor frame and the coil so that the rotating body does not contact, and the gap between the printed board and the coil It is represented by

[0009]

However, in the above-described conventional configuration, in order to reduce the motor height, the number of stacked stator cores, the number of coil windings, or the like must be reduced.
The only option is to reduce the thickness of the rotor frame or printed circuit board. If the number of stacked stator cores is reduced or the number of coil windings is reduced, a sufficient magnetic field cannot be generated,
There is a problem that the torque characteristics are reduced. If the thickness of the rotor frame or the printed circuit board is reduced, there is a problem that the strength of the motor is reduced. The required height of the motor is limited as described above, which hinders the thinning of the disk rotation drive.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a stator device of a brushless motor for rotating a disk which can maintain its performance and can be made thinner.

[0011]

In order to achieve this object, a brushless motor for rotating a disk according to the present invention is provided with a radial insertion hole for inserting a coil in a printed circuit board, and the insertion hole is wound around a stator core. Printed coil
Substrate side of the exciting coil portions inserted stator or purine of coils wound around the stator core in the insertion hole,
In this configuration, the excitation coil portion on the substrate side is inserted, and the wound coil and the coil insertion hole of the printed circuit board are integrally formed of a resin member to form a stator.

[0012]

With this structure, one of the coils wound around the core is inserted into the coil insertion hole of the printed circuit board, and the height of the coil portion inserted into the printed circuit board and the gap between the printed circuit board and the coil are reduced. The motor height can be reduced only when it becomes unnecessary. Further, the strength of the stator portion is increased by integrally molding the wound coil and the coil insertion hole of the printed board with a resin member.

[0013]

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1A is a sectional view of a brushless motor for driving a disk rotation according to a first embodiment of the present invention.
(B) is an enlarged view of a judgment surface of the disk rotation driving brushless motor. FIG. 2 shows an example of a coil insertion hole provided in a printed circuit board. FIG. 3A shows one salient pole portion of a stator core around which a coil is wound.
FIG. 3B shows a view in which the coil of FIG. 3A is inserted into the coil insertion hole.

1, 2 and 3, reference numeral 1 denotes a shaft,
2 is a rotor frame, 3 is a flange frame also serving as a back yoke of the FG magnet, 4 is a driving magnet, 5
Is an FG magnet, 6 is a stator core, 7 is a coil, 8
Is a printed circuit board, 9 is a coil insertion hole, and 10 is a Hall element.

Referring to FIGS. 1, 2 and 3, the structure of a brushless motor for rotating a disk according to a first embodiment of the present invention will be described.

The principle of chucking the disk is the same as that of the conventional example, and a description thereof will be omitted. The shaft is supported by oil-impregnated bearings for radial support, the rotor frame is supported via washers by ball bearings for thrust load support, and the shaft is press-fitted into the rotor frame. Rotate smoothly around.

A drive magnet 4 is fixed to the inside of the outer periphery of a cup-shaped rotor frame constituting a spindle hub portion by the rotor frame 2, and a flange frame 3 which is also a back yoke of the FG magnet is attached to the outside of the outer periphery. An FG magnet 5 is fixed to the flange frame, and a power generating wire element is arranged on a printed circuit board 8 facing a magnetized surface on which frequency power generation has been magnetized, so that an FG signal due to rotation of the motor is obtained. The rotor of the motor is controlled by the FG signal and rotates at the set number of revolutions.

A coil insertion hole 9 as shown in FIG. 2 is radially provided in a printed circuit board 8, and a coil 7 is wound around an insulated stator core 6, and the coil 7 wound around the stator core 6 is formed.
Is inserted into the coil insertion hole 9 to form a stator structure. In this stator structure, since the stator core 6 approaches the printed circuit board 8 and the positional relationship with the drive magnet changes, a plate portion is provided by bending one outer peripheral salient pole portion of the laminated stator core 6 on the rotor frame 2 side. Thus, the torque characteristics can be improved by guiding a large amount of the magnetic flux of the drive magnet 4 to the stator core 6.

If the size of the coil insertion hole 9 is not larger than the coil width in the radial direction as can be seen from FIG. 3, the coil to be inserted comes into contact with the coil insertion hole. Therefore, the gap between the coil insertion holes on the shaft side needs to be equal to or more than the minimum dimension in drilling, and the number of salient poles of the stator core of the motor is limited.

As described above, according to this embodiment, the height of the coil portion inserted into the printed circuit board is increased by the stator structure in which one side of the coil wound around the stator core is inserted into the coil insertion hole of the printed circuit board. In addition, the motor height can be reduced only by eliminating the need for the gap between the printed circuit board and the coil.

Embodiment 2 Hereinafter, a second embodiment of the present invention will be described with reference to FIG.

FIG. 4A is a sectional view of a brushless motor for driving a disk rotation according to the second embodiment, and FIG.
FIG. 3 is an enlarged view of a judgment surface of the brushless motor.
4, the symbols 1 to 10 are the same as the symbols in FIG. The difference from the configuration in FIG. 1 is that the wound coil 7 is molded with a resin member 11.

The structure of the brushless motor for driving the disk rotation according to the second embodiment of the present invention constructed as described above will be described below.

The printed circuit board 8 is provided with coil insertion holes 9 radially about the shaft 1. The coil 7 is wound around the insulated stator core 6, and one side of the coil 7 wound around the stator core 6. Is inserted into the coil insertion hole 9, and the wound coil 7 and the coil insertion hole of the printed circuit board 8 are integrally formed with the resin member 11 to form a stator structure.

With this configuration, the height of the motor can be reduced by the height of the coil portion inserted into the printed circuit board and by eliminating the need for a gap between the printed circuit board and the coil. The molding increases the strength of the stator structure and improves the shock resistance and the like of the disk drive.

[0027]

As described above, according to the present invention, a plurality of coil insertion holes are radially provided on a printed circuit board, and the coil wound around the coil insertion hole is inserted into the printed circuit board, thereby being inserted into the printed circuit board. A thin brushless motor stator device capable of reducing the motor height can be provided only by the height of the coil portion and by eliminating the gap between the printed circuit board and the coil. Further, by integrally molding the coil insertion portion and the printed board with a resin member, a stator device having high impact resistance can be obtained.

[Brief description of the drawings]

FIG. 1A is a sectional view of a brushless motor for rotating a disk in a first embodiment of the present invention. FIG. 1B is an enlarged half-sectional view of the brushless motor for rotating a disk in the first embodiment of the present invention.

FIG. 2 is a plan view of the printed circuit board as viewed from above according to the embodiment of the present invention;

FIG. 3A is a plan view showing one salient pole portion of a stator core around which a coil is wound. FIG. 3B is a plan view seen from above when the coil is inserted into a coil insertion hole.

4A is a cross-sectional view of a brushless motor for rotating a disk according to a second embodiment of the present invention. FIG. 4B is an enlarged half-sectional view of a brushless motor for rotating a disk according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a conventional brushless motor for rotating a disk;

[Explanation of symbols]

 Reference Signs List 1 shaft 2 rotor frame 3 flange frame 4 drive magnet 5 FG magnet 6 stator core 7 coil 8 printed board 9 coil insertion hole 10 hall element 11 resin member

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02K 3/30-3/52 H02K 1/18 H02K 29/00

Claims (2)

(57) [Scope of request for utility model registration] 1. A rotor frame that rotates with a shaft.
And the drive magnet attached to the rotor frame
Outer row that rotates with its rotor supported by bearings
In a brushless motor of the type, a stator core having a plurality of salient poles, an exciting coil wound around an insulating portion of the stator core, and a printed board for supplying power to the exciting coil, wherein the stator core is provided with the printed board
The same number of holes as the number of salient poles of the stator core are radially provided on the printed circuit board so as to be sandwiched between the rotor frame and the exciting coil portion on one printed circuit board side.
A stator structure for a brushless motor, wherein a winding portion of a coil portion is inserted into a hole of the printed circuit board. 2. A rotor frame that rotates with a shaft.
And the drive magnet attached to the rotor frame
Outer row that rotates with its rotor supported by bearings
In a brushless motor of the type, a stator core having a plurality of salient poles, an exciting coil wound around an insulating portion of the stator core, and a printed board for supplying power to the exciting coil, wherein the stator core is provided with the printed board
The same number of holes as the number of salient poles of the stator core are radially provided on the printed circuit board so as to be sandwiched between the rotor frame and the exciting coil portion on one printed circuit board side.
Insert the winding part of the coil part into the hole on the printed board, integrally mold the exciting coil wound with the resin member and the printed board, and insert the winding part of the exciting coil into the hole on the printed board
The stator structure of the brushless motor, characterized in that a resin member is filled in the gap thus formed by molding .