KR20020006279A - Brushless motor of single phase - Google Patents

Abstract

PURPOSE: A single phase brushless motor is provided to efficiently perform a working process and easily perform an assembling/dissembling process as well. CONSTITUTION: A stator includes a frame(10), a printed circuit board(40) and a stator core(15). A rotor includes a shaft(20) and a hob(30). The shaft(20) rotates around the stator core(15). The frame(10) includes a side wall(13) of tube shape to accommodate an external peripheral surface of the hob(30). A bracket(11) having a flat surface is formed on a central part of the side wall(13). A plurality of extensions(14) are radially formed on the bracket(11). A holder(12) having a shaft hole integrally protrudes upward to make the shaft(20) insert into the shaft hole. The printed circuit board(40) is attached on a lower surface of the bracket(11) of the frame(10) in a state of being contacted with an external peripheral surface of the holder(12). A hole having a predetermined size is formed at the center of the printed circuit board(40) to permit the shaft(20) to pass therethrough.

Description

Brushless motor of single phase

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-phase non-commutator motor mounted on an electronic device, and more particularly, to a single-phase non-commutator motor that simplifies the shaft structure supporting the shaft to improve manufacturability.

In general, there are many kinds of motors used for driving a disk or a fan in small precision devices such as HDD (hard disk driver), FDD (floppy disk driver), cooling fan, and the like.

Among them, single-phase non-commutator motors are mainly employed in cooling fans for the purpose of simple driving, which does not require precise control, which require low-cost manufacturing.

Most of these non-commutator motors are radial type three-phase driving methods in which a magnet is provided in the radial direction of the stator core with respect to the stator core. However, in recent years, the rectifier motor is driven according to the trend of simplifying the configuration and improving economic efficiency. In many cases, the method is applied to a single phase or two phases.

1 is an exploded perspective view showing a single-phase non-commutator motor mainly used in a conventional cooling fan, mainly a frame provided at the bottom, a substrate and a stator core attached to the upper surface of the frame, and the stator core. It consists of a shaft and a hub being rotated.

In the frame, a tubular holder protrudes upward from the center, and the shaft is rotatably fitted after the bearing is pressed into the inner diameter of the holder.

Here, the shaft is formed with a ring groove on the outer periphery of one end of the shaft, the end of the ring groove is formed through the holder and the ring member is inserted and fixed in a state of protruding a predetermined height to the bottom surface of the frame.

The printed circuit board, which is a driving circuit unit, is attached to the upper surface of the frame in contact with the outer circumferential surface of the holder, and the stator core is coupled to the upper surface of the printed circuit board.

The stator core is formed by stacking a plurality of iron pieces, and extends a plurality of arms in a radial direction, in which an armature coil is wound.

In addition, a hub is integrally coupled to the end of the shaft, and the hub has a cylindrical shape extending downwardly at the outer peripheral end thereof, and a blade for generating wind power at the outer periphery is integrally formed.

This hub is attached to the inner circumferential surface of the extending end of the hub is attached to form a concentric circle, the magnet is opposed to the arm end of the stator core to have a uniform air gap (gap) with each other.

The conventional single-phase non-commutator motor having such a configuration generates a predetermined driving force by an electromagnetic force generated by an electric current that is energized by an armature coil wound on a stator core, and the hub having a blade formed by the driving force at this time is a shaft. To rotate integrally with the.

However, the conventional single-phase non-commutator motor as described above is to assemble the printed circuit board, the stator core and the hub in order on the upper surface of the frame, wherein the shaft integrally coupled with the hub through the inner diameter of the holder of the frame Since it is fixed by the ring member in the protruding state on the bottom surface, when a circuit abnormality is found at the time of assembly is completed, there is a disadvantage in that the replacement and measurement of parts becomes very difficult.

That is, since the shaft is fixed by a ring member such as a C ring or an E ring, a separate tool must be used when assembling and disassembling, resulting in poor workability.

In particular, due to the use of the ring member, the frame is assembled with a combination of the printed circuit board and the stator core after the soldering operation of the printed circuit board and the coil wire in the assembly process, or the coil wire and the printed circuit are fixed after fixing the printed circuit board and the stator core to the frame Since soldering the substrate is not good workability there is a problem that the failure rate of the product is increased.

Therefore, the conventional single-phase non-commutator motor as described above is not only difficult to assemble and disassemble due to the ring member used to fix the shaft to the frame, but also to improve the occurrence of product defects such as limited freedom of the assembly process. There was a problem that became impossible.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a single-phase non-commutator motor that can efficiently improve the working method during the assembly process and facilitate assembly and disassembly. There is a purpose.

1 is an exploded perspective view showing a single phase rectifier motor according to the prior art;

2 is an exploded perspective view showing a single-phase non-commutator motor according to the present invention;

3 is a combined side cross-sectional view of a single phase, non-commutator motor according to the present invention.

<Description of the symbols for the main parts of the drawings>

10 frame 11: bracket

11 ': Hook groove 12: Holder

13 side wall 14 extension

15 stator core 16 coil

17: bearing 20: shaft

21: ring groove 25: ring

30: hub 31: blade

32: magnet 40: printed circuit board

50: cap 51: support plate

52: buffer member 53: hook

The single-phase non-commutator motor according to the present invention for realizing the above object has a frame having a holder in which a shaft hole is formed in the center portion protrudes upward, and a frame having a tubular sidewall formed around the bracket; A stator core seated on an upper surface of the bracket of the frame, coupled to an outer circumferential surface of the holder, and having a coil wound thereon; A shaft inserted into the shaft hole of the holder to be rotatably supported by a bearing and having a ring fitted to an end portion passing through the holder; A hub coupled to an upper end of the shaft and having a rim of an upper surface extending downward and having a magnet having a concentric circle on an inner circumferential surface thereof; A printed circuit board positioned on a bottom surface of the bracket of the frame and having a hole through which a shaft passes; The cap is in contact with the bottom surface of the printed circuit board and the cap is fixed to the inner peripheral surface of the bracket of the frame.

Hereinafter, a heat sink fastening device according to the present invention will be described with reference to the accompanying drawings.

Figure 2 is an exploded perspective view showing a single phase rectifier motor according to the present invention, Figure 3 is a combined side cross-sectional view of a single phase non-commutator motor according to the present invention.

As shown, a single-phase motor is roughly divided into a stator that remains stationary and a rotor that is rotated by interaction with the stator by power supply.

The stator is composed of a frame 10, a printed circuit board 40, and a stator core 15. The rotor is composed of a shaft 20 and a hub 30 which rotate about the stator core 15.

The frame 10 is generally formed with a tubular sidewall 13 to accommodate the outer circumferential surface of the hub 30, and a bracket 11 having a flat surface is formed on the central side of the sidewall 13.

Here, the bracket 11 has a plurality of extension pieces 14 are formed radially connected to the side wall 13, the holder 12 is formed in the central portion is formed a shaft hole for fitting the shaft 20 to be described later It protrudes upward integrally.

The printed circuit board 40, which is a driving circuit unit, is attached to the bottom surface of the bracket 11 of the frame 10 in contact with the outer circumferential surface of the holder 12, and the printed circuit board 40 has a shaft 20 at the center thereof. ) Is formed to have a predetermined size of holes therethrough.

In addition, the stator core 15, in which the armature coil 16 is wound, is coupled to the upper surface of the frame 10, that is, the upper surface of the bracket 11, in which a plurality of iron pieces are stacked in an arm extending in the radial direction. .

Here, when a current flows through the armature coil 16 wound on the stator core 15, an electromagnetic force is generated by interaction with a magnet 32 attached to an inner circumferential surface of the hub 30, which will be described later. The hub 30 and the shaft 20 are rotated integrally.

The shaft 20 is rotatably fitted to the holder 12 of the frame 10 while being supported by one or more bearings 17, and a portion of the lower end of the shaft 20 protrudes below the frame 10.

The shaft 20 has a ring-shaped ring groove 21 in which a ring 25, such as a C ring or an E ring, is fitted at the end thereof, so that the frame 25 is assembled to the ring groove 21 by assembling the ring 25. Departure from (10) is prevented.

Hub 30 is integrally coupled to the upper end of the shaft 20 is rotated, the hub 30 has a cylindrical shape extending downwardly the outer peripheral end.

The hub 30 has a magnet 32 having concentric circles on the inner circumferential surface of the extended extension end, and the blade 31 for generating wind is integrally formed on the outer circumferential surface.

Here, the magnet 32 attached to the inner circumferential surface of the hub 30 interacts with the end portions of the arms of the stator core 15 by having uniform gaps with each other.

The configuration as described above is almost the same as the structure of the conventional single-phase non-commutator motor, but the present invention is to position the printed circuit board 40 to the bottom surface of the bracket 11 of the frame 10, this cap 40 ) Is the most prominent feature.

That is, the bracket 11 of the frame 10 has a groove having a predetermined depth toward the bottom surface side, and the hook groove 11 'is formed at a plurality of points at predetermined intervals on the inner circumferential surface of the groove.

The cap 40 attached to the bottom surface of the frame 10 is fixed to the bracket 11 of the frame 10 while supporting the printed circuit board 40 from the lower side, and the cap 40 The large consists of the backing plate 51 and the buffer member 52 and the hook (53).

The base plate 51 is generally formed in a disc shape having a flat surface, and has a size corresponding to the bracket 11 of the frame 10.

The buffer member 52 is attached to the upper surface of the support plate 51, and is molded of a material such as rubber having excellent elastic deformation force.

The buffer member 52 is prevented from damaging the printed circuit board 40 by absorbing impact force or vibration transmitted from the outside by contacting the bottom surface of the printed circuit board 40.

Such a buffer member 52 may be variously modified as long as it has a characteristic capable of performing shock absorption.

Hook 53 is to substantially secure the cap 40 to the frame 10, is formed at a predetermined interval on the upper edge of the base plate 51, the hook formed on the inner peripheral surface of the bottom of the corresponding bracket (11) It engages in the groove 11 '.

Such, the hook 53 is usually extended upward to have a predetermined height and the locking jaw is protruded in one direction at its end portion, the locking jaw portion is inserted into the hook groove (11 ') formed in the bracket (11) The fixing force is exerted.

Here, the hook 53 is formed at a position coincident with each other with the hook groove 11 ′ formed on the inner peripheral surface of the bracket 11 of the frame 10, and the cap 40 is firmly fixed to the frame 10. It is preferable that the sizes of the hooks 53 and the hook grooves 11 'are determined so as to maintain the closed state.

Referring to the assembly process of the single-phase non-commutator motor according to the present invention made as described above is as follows.

First, the stator core 15 wound with the coil 16 is attached to the upper surface of the frame 10.

Subsequently, the hub 30 coupled to rotate integrally with the shaft 20 is positioned on the upper surface of the frame 10, and then the lower end of the shaft 20 is fitted into the shaft hole formed in the holder 12 of the frame 10. do.

Here, the shaft 20 is supported by a bearing 17 so that it can be rotated freely, a portion of the lower end of the shaft 20 is fitted to the holder 12 of the frame 10 to the outside, that is, of the frame 10 It becomes the state which protruded to the lower side.

Subsequently, the printed circuit board 40, which is a driving circuit part, is positioned on the bottom surface of the frame 10.

At this time, the shaft 20 passes through the hole formed in the center of the printed circuit board 40, and then the ring 25 is assembled to the ring groove 21 formed at the end of the shaft 20 so that the shaft 20 is framed. To be fixed at (10).

Then, the cap 40 is positioned below the printed circuit board 40.

Subsequently, when the hook 53 formed on the base plate 51 is aligned with the hook groove 11 'formed on the bracket 11 of the frame 10, the cap 40 is moved upward. The cap 40 is fixed to the frame 10 by engaging the hook groove 11 ′.

On the other hand, if the above-described assembly process is performed in the reverse order, the cap 40 can be separated from the frame 10 and the printed circuit board 40 is exposed to the outside, thereby facilitating repair and inspection.

The single-phase no-commutator motor according to the present invention constructed and operated as described above can effectively improve the assembly process to significantly reduce product defect rates such as coil breaks generated during the assembly process, and in the event of a circuit failure. Opening the cap at the bottom of the frame exposes the component surface of the printed circuit board, thereby facilitating replacement and measurement of the component.

In addition, the cap is used to protect the bottom of the frame to prevent foreign material from entering into the bearing part.In particular, it is fixed by using the hook of the cap without using a conventional adhesive or a screw to fix the printed circuit board. Since it is easy to assemble and detach there is an advantage.

Therefore, as compared with the conventional method of fixing the shaft by the ring member, not only the assembly performance and workability are improved, but also the impact on the shaft during the assembly process is minimized, which can greatly reduce the product defect rate such as bearing damage generated during assembly. There is an advantage to that.

Claims (2)

A frame having a bracket in which a holder formed with a shaft hole protrudes upward from a central portion thereof, and a tubular sidewall formed around the bracket; A stator core seated on an upper surface of the bracket of the frame, coupled to an outer circumferential surface of the holder, and having a coil wound thereon; A shaft inserted into the shaft hole of the holder to be rotatably supported by a bearing and having a ring fitted to an end portion passing through the holder; A hub coupled to an upper end of the shaft and having a rim of an upper surface extending downward and having a magnet having a concentric circle on an inner circumferential surface thereof; A printed circuit board positioned on a bottom surface of the bracket of the frame and having a hole through which a shaft passes; Single phase non-commutator motor, characterized in that made of a cap in contact with the bottom surface of the printed circuit board and fitted to the inner peripheral surface of the bracket of the frame. The method of claim 1, The cap is formed of a plate-shaped support plate, a cushioning member attached to the upper surface of the support plate, a hook formed on the rim of the support plate at a predetermined interval and hooks formed on the hook groove formed on the bottom inner circumferential surface of the corresponding bracket. Single phase rectifier motor.