JPH01194834A - Micro fan motor - Google Patents

Abstract

PURPOSE:To facilitate assembling, by inserting a fan block and a stator block assembled independently from the opposite ends of a case then securing in place. CONSTITUTION:A case 17 has a hole 18 opened to the opposite sides, and a rectangular containing space is formed in the bottom. A stator B is inserted through one opening of the hole 18, then the outer circumference of a stator supporting section 16 is fitted to the inner circumference of the hole 18 and adhered. Then a fan block A having a shaft 4 applied with a washer 20 and a bearing 12 is inserted through the other opening of the hole 18 and fitted to the stator block B. In other word, the shaft 4 is inserted into bearing bases 8, 9 where one end of the shaft 4 is supported by the bearing 12 while a pre- pressurized spring 21, a bearing 12 and a washer 27 are inserted in the large diameter section of the bearing base 9 at the other end of the shaft 4. The fan block A is secured rotatably and not removably to the stator block B through a stop washer 22.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 7] The present invention relates to a small micro-motor for spot-cooling ICs and the like.

[Prior art 1] Conventionally, a small 7T sonicator for spot-cooling ICs and the like was equipped with brushes, which caused problems in terms of lifespan and noise caused by the brushes. Further, in those employing a brushless motor, there is a problem in that the driver circuit is externally attached.

This is because, by making it brushless, the required driver circuit g is reduced by the driver circuit printed board 52 placed at the bottom of the stator block 51 in the case of a normal 7T motor, as shown in FIG. If it were to be made small, it would be very difficult to do so because the printed board 52 would get in the way and there would be a problem with the air outlet. Furthermore, the 7Tton 53, yoke 54, shaft 55, etc. have become smaller, and the fixing method has changed, that is,
There was a problem that it was difficult to fix and assemble. In FIG. 5, a bearing pedestal 57 is provided protruding from the center bottom of the case 56, a printed board 52 is fixed to the outside of this bearing pedestal 57, a bearing 58 is mounted inside, and a coil 60 is attached to a stator 59. The attached stator block 51 is fixed to the lees receiving stand 57 side. Further, the magnet 61 is fixed to the inner peripheral surface of the yoke 54.

[Problems to be Solved by the Invention] The present invention has been provided in view of the above-mentioned points, and an object of the present invention is to provide a micro 7 motor that is small in size, easy to assemble, and has a long life. That is.

[Means for Solving the Problems 1] [Function] The present invention provides a yoke in which a magnet is provided on the inner periphery and a cylindrical protrusion is formed on the closed surface on one side, and a yoke that is inserted into the yoke to form a cylindrical protrusion at one end. A shaft press-fitted into the cylindrical protrusion and a 7T tongue fixed to the outer periphery of the cylindrical protrusion form a 77 block, which is divided into two parts in the axial direction, one of which is a stator wound with a coil. A stator block is formed by a bearing stand whose narrow diameter part passes through the inside of the stator and is fixed to the other on the outside to hold the respective bearings, and a first printed board to which a position detection element is mounted and fixed to the other bearing stand. one opening of the case, which has a hollow approximately round hole and a storage space in which a second printed board connected to the first printed board and mounted with drive circuit components at the bottom is disposed parallel to the shaft; By inserting and fixing the stator block from one side of the case, inserting the 7 unblock from the other opening side of the case, and rotatably mounting the shaft on the bearing of the bearing stand, the fan is assembled and configured without any separate attachments. This is characterized in that the block and stator block are inserted and fixed from both opening surfaces of the case.

[Embodiment 1] Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, let's explain fan block 8. In FIGS. 1 to 4, a yoke 1 is formed into a cylindrical shape with one side closed, and a cylindrical magnet 2 is fixed to the inner peripheral surface of the yoke 1. A cylindrical protrusion 3 is integrally provided on the closed surface of the yoke 1 and protrudes outward, and a shaft 4 serving as a rotation axis is inserted into the hole 3a of the cylindrical beam $3.
One end is press-fitted. Further, a 7-inch ring 5 is press-fitted or adhesively fixed to the outer periphery of the cylindrical projection 3.

Further, the stator block B is configured as follows. A coil 7 is wound around the stator 6 which is integrated into a laminated structure, and the narrow diameter portion 10 of one of the bearing pedestals 9 of the bearing pedestals 8 and 9, which are divided into two in the axial direction, is inserted into the hole 6a of the stator 6. Fitted or fixed with adhesive. The tip of the narrow diameter portion 10 of the bearing stand 9 is caulked and fixed to the hole 8a of the bearing stand 8, and both bearing stands 8,
9 are combined. Bearings 12 and 13, which are ball bearings, are held in the large diameter portions 11 of the bearing pedestals 8 and 9, respectively. A Hall element 15, which is a position detection element, is mounted on the small printed board 14, and the hole 14 of the printed board 14 is mounted on the small printed board 14.
a and the large diameter portion 11 are fitted, and the printed board 14 is fixed to the bearing stand 9. Further, terminal processing of the coil 7 is also performed on the printed board 14. Furthermore, stator support 1!1s
The large diameter portion 11 is inserted into the 1G hole 16a, and the bearing stand 9, printed board 14, etc. are ultrasonically welded or adhesively fixed to the stator support portion 16, thereby forming the stator block B.

A case 17 for storing both blocks A and B is formed in a semicylindrical shape, has holes 18 open on both sides, and has a square storage space 19 formed at the bottom. The stator block B is inserted through one opening of the hole 18 of the case 17, and the outer periphery of the stator support portion 16 and the inner periphery of the hole 18 are fitted together (FIG. 4) and fixed with adhesive. From the other opening of the hole 18, a 7 unblock 8 is inserted into the shaft 4 with the washer 20 and the bearing 1.
2, the stator block B is fitted.

That is, the shaft 4 is inserted into the bearing pedestals 8 and 9, one end of the shaft 4 is supported by the bearing 12, and the other end is supported by the bearing pedestal 9.
A preload spring 21, a bearing 13, and a washer 2 are installed in the large diameter portion 11 of
7 is inserted, and the lock washer 22 fixes the block A to the stator block B so that it can rotate freely and prevent it from coming off.

Furthermore, a printed board 23 on which components for a smoke driver circuit such as an IC are mounted is inserted into the square storage space 19 at the bottom of the case 17, and the printed board 14 is inserted into a square hole 28 provided in the printed board 23. They are fitted and the soldering is fixed. Further, in the storage space 19, four lead pins 24 are provided perpendicularly to the printed board 23 by press-fitting or simultaneous molding. A round hole 25 is provided in the printed board 23 at a position corresponding to the lead pin 24, which is fitted and soldered, and the back cover 26 is protruded to serve as an input/output terminal. The opening surface of the storage space 19 is closed by a back cover 26. Further, the printed board 23 is arranged parallel to the shaft 4.

With this configuration, even if the 7rn 5, yoke 1, shaft 4, magnet 2, etc. are downsized, they can be easily made into blocks because they have a fitting structure.

Further, since the bearing stands 8 and 9 are divided into two, a large space for winding the stator 6 can be secured. Furthermore, the driver circuit is divided into two parts, a Hall element 15 (only 14) is provided at the wind outlet, and the stator block B
A printed board 23 is provided parallel to the V7 unblock A, and both printed boards 14 and 23 are fitted and fixed vertically, so the ultra-compact 7 ammotor with built-in driver circuit can be operated without blocking the air outlet. This is something that can be provided.

In addition, the lead pins 24 that serve as terminals are provided in advance on the lower surface of the case 17, and the printed board 23 is inserted into it and attached to the half-tn, making assembly easy. Furthermore, even if force is applied to the lead pins 24, the printed board 23 shall not cause any damage.

[Effects of the Invention] As described above, the present invention includes a yoke having a magnet on its inner periphery and a cylindrical protrusion formed on the closed surface, and a yoke that is inserted into the yoke and has one end formed with the cylindrical protrusion. A shaft press-fitted into the part and a fan fixed to the outer periphery of the cylindrical protrusion form a seven-prong block, which is divided into two parts in the axial direction, including a stator wrapped with coils, and one part has a narrow diameter part. A stator block is formed by a ring holder that is inserted through the stator and fixed to the other on the outside to hold a bearing, and a first printed board to which a position detection element is mounted and fixed to the other bearing holder, The stator block is inserted into the case from one opening surface of the case, which has a hollow approximately round hole and a storage space at the bottom in which a second printed board connected to the first printed board and mounted with drive circuit components is placed parallel to the shaft. The 77 block was inserted and fixed, the 7 block was inserted from the other opening of the case, and the shaft was rotatably mounted on the bearing of the bearing stand. The fan block and stator block can be inserted and fixed from both openings of the case, and the fan block and stator block can be easily assembled inside the case. Moreover, the shaft and fan can be integrated into the yoke without any additional parts. By joining, it is possible to easily construct a 7-amp block even if each member is miniaturized, and since the bearing stand is divided into two parts, a large 8m space can be taken up.Furthermore, By mounting a position detection element on the first printed board and a drive circuit on the second printed board, the air outlet is not blocked, and the air volume can be secured with a small size. It is something to play.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the entire embodiment of the present invention, FIG. 2 is an exploded perspective view of the fan block same as the above, FIG. 3 is an exploded perspective view of the stator block same as the above, and FIGS. ) are a front view and a sectional view of the same as above, and FIG. 5 is an exploded perspective view of the conventional example. 1 is the yoke, 2 is the magnet, 3 is the cylindrical protrusion, 4 is the tire, 5 is the 7ton, 6 is the stator, 8°9 is the bearing stand, 1
0 is a narrow diameter portion, 12 and 13 are bearings, 14 is a first printed board, 17 is a case, 19 is a storage space, and 23 is a second printed board. Agent tt - Buried stone 1) Long 7th 4th (b)

Claims (1)

[Claims] (1) In an outer rotor type micro fan motor in which a magnet and a yoke formed on the outside of the magnet rotate the outer periphery of a stator wound with a coil, a magnet is provided on the inner periphery of the stator and one side is closed. A fan block is formed by a yoke having a cylindrical protrusion, a shaft inserted into the yoke and having one end press-fitted into the cylindrical protrusion, and a fan fixed to the outer periphery of the cylindrical protrusion,
A stator with a coil wound thereon, a bearing stand that is divided into two parts in the axial direction, one of which has its narrow diameter part passed through the stator and is fixed to the other on the outside to hold a bearing, and a position detection element. A stator block is formed with a first printed board that is attached and fixed to the other bearing stand, and a second printed board that has a hollow approximately round hole and that is connected to the first printed board at the bottom and has drive circuit components mounted thereon. Insert and fix the stator block through one opening of a case that has a storage space to place the printed board parallel to the shaft, insert the fan block through the other opening of the case, and rotate the shaft using the bearing in the bearing stand. A micro fan motor that is characterized by being able to be installed freely.