JPH1169669A - Dc brushless fan motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the damage of a winding film, and to conduct orientation surely, by forming a recessed section on one side of a spoke section extended from the outer circumferential surface of the torus base section of a stator core assembly, forming a projecting section to a spoke section elongated from the outer circumferential surface of the torus base section of an insulator, and fitting the projecting section to the recessed section shaped to a stator core. SOLUTION: Recessed sections 23 are formed on a circumferene 33 at the same pitches on one sides of spoke sections 18, 19, 20, 21 extended from the torus base section 17 of a stator core 16. A projecting section 26 capable of being inserted and fitted into the recessed section 23 formed to the spoke section of the stator core with a minute clearance is shaped to one 25 of spoke sections elongated from the outer circumferential section 24 of the torus base section of an insulator A11. A rib 27 is formed to the inner circumferential section of the torus base section of the insulator A11, and pressed in and held minutely to the outer circumferential surface of the torus base section of the stator core. Accordingly, the damage of a winding film is prevented, and orientation is carried out surely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC brushless fan motor for cooling electrical equipment such as computers and copiers.

[0002]

2. Description of the Related Art Conventionally, as a method of assembling and fitting a stator core and an insulator, a stator assembly in a spindle motor or the like described in Japanese Utility Model Laid-Open No. 3-74154 is known.

FIG. 5 shows a stator assembly in a spindle motor and the like described in Japanese Utility Model Laid-Open No. 3-74154.

In FIG. 5, at a position shifted in a circumferential direction by a predetermined angle clockwise or counterclockwise from a bisector of a central angle formed by adjacent teeth, an axial groove is formed in an outer peripheral surface of an annular base of the stator core. The plastic insulator covered with the stator core is further provided with an axial projection so as to correspond to the concave groove provided in the stator core, whereby the front or back of the stator core is defined. Fitting from only one of them is possible.

[0005]

However, in the above-mentioned conventional structure, the positioning function is achieved by the concave portion provided on the outer peripheral surface of the annular base portion of the stator core and the convex portion provided on the annular base portion of the plastic insulator. The outer circumferential surface of the ring base of the insulator is a surface that is wound in an orthogonal relationship while the winding slides when the winding is wound, and because of the difference in the thickness of the plastic by providing a convex portion on the insulator. Damage to the wound film due to sink and swelling of the insulator during resin molding, or
There is a problem that a rare short between windings occurs due to peeling of the winding film.

SUMMARY OF THE INVENTION The present invention solves such a conventional problem. The insulator has a uniform thickness on the surface of the insulator that slides in an orthogonal relationship with the winding, so that the winding is caused by sink and swelling during resin molding. Prevents the occurrence of rare short-circuits between windings due to damage to the wire coating or peeling of the winding coating, and enables reliable positioning without mistaking the direction of the stator core with directionality depending on the rotation direction of the motor. It is another object of the present invention to provide a DC brushless fan motor.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a spoke portion for winding a winding extending from an outer peripheral surface of an annular base of a laminated stator core assembly constituting a stator winding assembly. A recess on one side of
A spoke portion extending from an outer peripheral surface of a ring base of a plastic insulator for insulation from a winding is provided with a convex portion which can be fitted with a concave portion provided in the stator core and a minute clearance.

As a result, the surface of the insulator that slides perpendicularly to the winding at the time of winding is made uniform in thickness, so that the wound film is damaged by resin sink and swelling during resin molding, or the wound film is peeled off. Therefore, it is possible to prevent the occurrence of a rare short circuit between the windings, and to reliably determine the direction of the stator core having directivity depending on the rotation direction of the motor without making a mistake.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a part of one side of a spoke portion for winding a winding extending from an outer peripheral surface of an annular base of a stator core assembly constituting a stator winding assembly. In addition, a recess is provided on the same circumference, and the spoke portion extending from the outer peripheral surface of the annular base of the plastic insulator for insulation from the winding is also provided on the stator core assembly in the circumferential direction on one side of the spoke portion. This is a DC brushless fan motor provided with a concave portion provided and a convex portion that can be fitted with a minute clearance. The surface of the insulator that slides in an orthogonal relationship with the winding at the time of winding has a uniform thickness. This prevents the winding film from being damaged by sinking and swelling during resin molding, or prevents the occurrence of a rare short between windings due to the peeling of the winding film. It has the effect of making it possible to reliably position without wrong direction of the stator core having a directionality.

According to a second aspect of the present invention, there is provided the DC brushless fan motor according to the first aspect, wherein the bearing holding portion is integral with the inner peripheral portion of the annular base of the insulator. The surface of the insulator that slides in an orthogonal relationship with the insulator is made uniform in thickness, so that sinks during resin molding and swelling damage the winding film or peel off the winding film, resulting in rare short circuit between windings. And the direction of the stator core having directionality depending on the rotation direction of the motor can be reliably determined without making a mistake in the direction.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a view showing one embodiment of the present invention, in which a frame 2 having an air passage 1 and a bearing holding portion provided via mounting feet 3 extending from the frame. A rotor 9 having a rotating shaft 6 rotatably supported by a bearing 5 fixed to the bearing holding portion 4 and a magnet 8 opposed to a stator winding assembly 7 fixed to the bearing holding portion 4. Then, the blade 10 is fixed to the rotor 9. In FIG. 1, the stator winding assembly 7 includes a laminated stator core 16 having directionality with respect to the rotation direction of the motor, an insulator A11 made of plastic, and an insulator B1.
The insulation B12 is insulated from the winding 13, and connection pins 14 for connecting the winding 13 and the circuit section are press-fitted and fixed to the insulator B12 and connected to the circuit board 15. 31 is a lead wire. The stator core 16 shown in FIG. 2 includes spoke portions 18, 19, 20, and 21 extending from the annular base portion 17, and tooth portions 22 having directionality depending on the rotation direction of the motor located at the outermost periphery. 19,
On one side of 20 and 21, recesses 23 on the same pitch circumference 33
Is provided. In addition, one spoke 25 extending from the annular base outer peripheral portion 24 of the insulator A11 is provided with a concave portion 23 provided in the spoke portion of the stator core and a convex portion 26 which can be inserted and fitted with a small clearance. A rib 27 is provided on the inner peripheral portion of the annular base of the insulator A11 at a position divided equally by a conventionally used method, so that the outer peripheral surface of the annular base of the stator core is slightly press-fitted and held. .

With the above configuration, the surface of the insulator, into which the winding 13 slides in an orthogonal relationship during winding, has a uniform thickness, thereby preventing sink and swelling during resin molding.
Prevents the occurrence of rare short-circuits between windings due to damage to the winding film or peeling of the winding film, and ensures that the stator core with directionality depends on the rotation direction of the motor without mistake in directionality. Can be possible.

(Embodiment 2) In FIG. 3, a frame 2 having an air passage 1 and a shaft holding portion 28 provided via a mounting foot 3 extending from the frame 2, and fixed to the shaft holding portion 28 The bearing 5 is fixed to a bearing holding part 30 extending from the inner diameter side of the annular base of the insulator A 29, and the rotating shaft 6 rotatably supported on the bearing 5 and the magnet 8 facing the stator winding assembly 7. The rotor 9 has a blade 10 fixed to the rotor 9. The stator winding assembly 7 includes a stacked stator core 16 having directionality with respect to the rotation direction of the motor, and a plastic insulator A29.
And insulation between the winding 13 and the insulator B12,
A connection pin 14 for connecting the winding 13 and the circuit section is press-fitted and fixed to the insulator B12 and connected to the circuit board 15. The stator core 16 shown in FIG. 4 includes spokes 18, 19, 20, and 21 extending from the annular base 17 and teeth 22 having directionality depending on the rotation direction of the motor located at the outermost periphery. 19,
On one side of 20 and 21, recesses 23 on the same pitch circumference 33
Is provided. One of the spoke portions 25 extending from the annular base outer peripheral surface 24 of the insulator A29 is composed of a concave portion 23 provided in the spoke portion of the stator core and a convex portion 26 which can be inserted and fitted with a small clearance.

Also in this embodiment, the surface of the insulator into which the winding 13 slides in an orthogonal relationship at the time of winding is made uniform in thickness, thereby preventing sinks and swelling during resin molding and damaging the winding film. Alternatively, it is possible to prevent the occurrence of a rare short circuit between the windings due to peeling of the winding film, and to reliably position the stator core having directionality in the rotation direction of the motor without confusing the directionality. .

In the above description, the convex portion 26 is provided on one or two spoke portions extending from the outer peripheral surface of the annular base portion of the insulator. The present invention can be similarly applied to a device provided with a portion.

[0017]

As is clear from the description of the above embodiment,
According to the first and second aspects of the present invention, the surface of the insulator, in which the winding 13 slides perpendicularly to the spoke portion of the stator core and the spoke portion of the insulator at the time of winding, has a uniform thickness. Prevent sink marks and swelling at the time of resin molding, prevent the occurrence of rare shorts between windings due to damage to the winding film or peeling of the winding film, and provide a stator core with directionality in the rotation direction of the motor. An advantageous effect is obtained in that the direction can be determined without mistake in the directionality.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a DC brushless fan motor according to Embodiment 1 of the present invention.

FIG. 2 is a detailed diagram for explaining the operation of the DC brushless fan motor according to the first embodiment of the present invention.

FIG. 3 is a half sectional view showing a DC brushless fan motor according to a second embodiment of the present invention;

FIG. 4 is a detailed diagram for explaining the operation of the DC brushless fan motor according to the second embodiment of the present invention.

FIG. 5 is a conventional stator assembly diagram.

[Explanation of Signs] 31 Lead wire 32 Distributing line of minute rib for press-fitting and holding stator core and insulator

Claims (2)

[Claims] 1. A frame having a ventilation passage, a bearing holding portion provided via a mounting leg extending from the frame, and a rotating shaft rotatably supported by a bearing fixed to the bearing holding portion. A motor portion comprising a stator winding assembly fixed to the bearing holding portion and a rotor having a magnet opposed thereto; and a blade fixed to the rotor, and the stator winding assembly rotates the motor. The two stator cores, which require directionality depending on the direction, and insulation for windings
A divided plastic insulator and a connection pin for connecting a winding and a circuit portion are press-fitted and fixed to one side of the insulator, connected to a circuit board, and a winding extending from an outer peripheral surface of an annular base portion of the stator core. A recess is provided in a part of one side of the spoke part for winding the wire, and the spoke part extending from the outer peripheral surface of the annular base of the plastic insulator is also provided on one side of the spoke part with the recess provided in the stator core assembly and the minute clearance. A DC brushless fan motor having a mating protrusion. 2. The DC brushless fan motor according to claim 1, wherein the bearing holding portion is integral with the annular base of the insulator.