TWI653808B - Micro motor and its fan - Google Patents

Abstract

The utility model relates to a miniature motor, which is used for solving the problem of insufficient axial coupling height between a conventional bearing and a shaft center. The system includes: a base; a bearing provided on the base, the bearing having a shaft hole, the bearing having a highest surface in the axial direction of the bearing; a shaft center, rotatably coupled to the shaft hole; A sub-group, which is coupled to the base; and a rotor group, which is coupled to the shaft center, the rotor group has a motor housing, and the motor housing has a lowest bottom edge in the axial direction corresponding to the bearing, and the lowest bottom edge and There is a minimum distance between the highest surfaces of the bearing, and the minimum distance is between 0.05mm ~ 0.16mm. The invention also discloses a fan having the micromotor.

Description

Miniature motor and fan

The present invention relates to a motor, especially a miniature motor.

The invention relates to a fan, especially a fan with a micro motor.

With the development of thin and thin electronic products with high performance, in addition to meeting the heat dissipation requirements of electronic products, the cooling fans have further pursued "thinning". Therefore, in recent years, many development trends of cooling fans have focused on "how to reduce The axial height of the cooling fan. "

The conventional micro motor includes a base, a rotor, and a stator. A bearing and a shaft center are arranged in the base, and the shaft center is rotatably provided in a shaft hole of the bearing. The rotor has a hub rotatably disposed on the shaft center, and the rotor further has a magnet ring coupled to the hub and facing the base. The stator has a circuit substrate and a plurality of induction coils. The circuit substrate is assembled between the base and the hub. The plurality of induction coils are disposed on the circuit substrate and oppose the magnet ring. By the structural arrangement of the stator group, the axial height of the overall micromotor can be reduced. An embodiment similar to the conventional micromotor has been disclosed in the "Thin Motor" Patent of the Republic of China Publication No. I483515.

However, although the conventional miniature motor can reduce the overall axial height to achieve the requirement of thinning, it also shortens the axial coupling height between the bearing and the shaft center, and makes the distance between the bearing and the shaft center shorter. The axial coupling height is insufficient. Therefore, the stability during rotation is often poor and easy to shake, which is likely to cause large vibration and noise, which seriously affects the operation stability of the overall micromotor.

In view of this, the conventional micro motor does still need to be improved.

In order to solve the above problems, the present invention provides a micro motor, which can increase the axial coupling height between the bearing and the shaft center to improve the stability during rotation.

A secondary object of the present invention is to provide a fan having a micromotor, which can improve the stability during rotation and further extend the overall service life of the fan.

The following directional or similar terms of the present invention, such as "front", "rear", "upper (top)", "lower (bottom)", "inside", "outside", "side", etc., are mainly related to With reference to the directions of the accompanying drawings, each directivity or its approximate terms are only used to assist in explaining and understanding the embodiments of the present invention, and are not intended to limit the present invention.

The miniature motor of the present invention comprises: a base; a bearing provided on the base, the bearing having a shaft hole, the bearing having a highest surface in the axial direction of the bearing; and a shaft center rotatably coupled to The shaft hole; a certain subgroup coupled to the base; and a rotor group coupled to the shaft center, the rotor group having a motor housing, the motor housing having a lowest bottom edge in the axial direction corresponding to the bearing, There is a minimum distance between the lowest bottom edge and the highest surface of the bearing, and the minimum distance is between 0.05 mm and 0.16 mm.

The fan with a micromotor according to the present invention includes the micromotor.

According to this, the micromotor and the fan of the present invention are used in the axial direction corresponding to the bearing, the motor housing has a lowest bottom edge, and there is a minimum distance between the lowest bottom edge and the highest surface of the bearing, and the minimum The pitch is between 0.05mm ~ 0.16mm. Under the condition that the overall axial height of the micromotor is unchanged, the axial coupling height of the bearing and the shaft center can be increased to improve the stability during rotation and make the The micro motor runs more smoothly and steadily, which can avoid operating noise and extend the overall life of the fan.

Wherein, the motor housing has a shaft connection portion, and the shaft connection portion is combined by lightning welding. On the outer peripheral surface of the axis. In this way, the system has the effect of improving the stability of the motor housing and the shaft center.

Wherein, the motor housing has a shaft-connecting flange portion, the shaft-connecting flange portion is bent by the shaft-connecting portion toward the bearing and fits on the outer peripheral surface of the shaft center, and the shaft-connecting flange portion is formed with the lowest bottom edge. In this way, the shaft-connecting flange portion has the effect that the combination of the motor case and the shaft center can be more stable.

Wherein, the motor housing has a shaft-connecting flange portion, and the shaft-connecting flange portion is bent from the shaft-connecting portion in a direction away from the bearing and fits on the outer peripheral surface of the shaft center. In this way, the shaft-connecting flange portion has the effect that the combination of the motor case and the shaft center can be more stable.

The rotor assembly has a magnetic element and a magnetic piece. The magnetic element is disposed inside the motor case, and the magnetic sealing element is coupled between the motor case and the magnetic element. In this way, the motor case and the magnetic sealing member have the effect of providing a better magnetic sealing effect.

Wherein, the thickness of the magnetic sealing member is less than or equal to 0.1 mm. In this way, the system has the effect that the overall weight of the rotor group can be prevented from becoming too large.

The thickness of the motor case is less than or equal to 0.1 mm. In this way, the system has the effect that the overall weight of the rotor group can be prevented from becoming too large.

Wherein, the nozzle of the shaft tube is formed by shrinking in a hot-melt manner to locate the bearing. In this way, it has the effect that the bearing can be firmly incorporated in the shaft tube.

1‧‧‧ base

1a‧‧‧Inner surface

1b‧‧‧outer surface

11‧‧‧ shaft tube

2‧‧‧bearing

21‧‧‧ Shaft hole

22‧‧‧ highest surface

23‧‧‧Leading corner

3‧‧‧ axis

4‧‧‧ stator set

41‧‧‧Circuit Board

42‧‧‧coil assembly

5‧‧‧rotor set

51‧‧‧Motor housing

511‧‧‧shaft joint

512‧‧‧ lowest bottom edge

513‧‧‧Shaft flange

52‧‧‧Magnetic components

53‧‧‧Magnetic pieces

F‧‧‧Fan leaf group

G‧‧‧Minimum spacing

H1‧‧‧Overall axial height

H2‧‧‧ axial joint height

Fig. 1: A sectional view of a first embodiment of a micromotor according to the present invention.

Fig. 2: A sectional view of a second embodiment of a micromotor according to the present invention.

FIG. 3 is an assembled sectional view of a third embodiment of the micromotor of the present invention.

FIG. 4 is a sectional view of a fan according to a preferred embodiment of the present invention.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the following describes the preferred embodiments of the present invention and the accompanying drawings in detail, as follows: Please refer to FIG. The first embodiment of the micromotor of the present invention includes a base 1, a bearing 2, a shaft center 3, a certain sub-group 4 and a rotor group 5. The bearing 2 is provided on the base 1, and the shaft A core 3 is rotatably coupled to the bearing 2, the stator group 4 is coupled to the base 1, and the rotor group 5 is coupled to the shaft center 3.

Referring to FIG. 2, the base 1 has an inner surface 1 a and an outer surface 1 b opposite to each other. The inner surface 1 a of the base 1 may be provided with a shaft tube 11 for receiving the bearing 2. In this embodiment, the shaft tube 11 is integrally connected to the inner surface 1a, so plastic base material can be integrally injection-molded to form the base 1 to improve the manufacturing convenience of the base 1. Although this embodiment is integrally injection-molded, The molding of the base 1 is described as an example, but is not limited thereto.

Referring to FIG. 1, the bearing 2 is provided in a shaft tube 11 of the base 1, and the mouth of the shaft tube 11 is preferably formed by a heat-shrinking neck to locate the bearing 2. The bearing 2 has a shaft The hole 21 is used for the shaft center 3 to pass through. Wherein, in the axial direction of the bearing 2, the bearing 2 has a highest surface 22. In addition, the bearing 2 also has a chamfered portion 23, which is adjacent to the highest surface 22 and is disposed in the shaft hole 21. With the hole edge, the guide angle portion 23 can improve the assembly convenience of the bearing 2 and the shaft center 3.

Referring to FIG. 1, the shaft center 3 is rotatably coupled to the shaft hole 21 of the bearing 2, so that the bearing 2 is disposed between the shaft tube 11 and the shaft center 3.

Referring to FIG. 1, the stator group 4 is coupled to the base 1. The stator group 4 may have a circuit board 41 and a coil assembly 42, and the circuit board 41 may be attached to the inner surface 1 a of the base 1. The coil assembly 42 is assembled on the circuit board 41.

Referring to FIG. 1, the rotor group 5 is coupled to the shaft center 3. The rotor group 5 has a motor housing 51, and the motor housing 51 may have a shaft connection portion 511. The rotor group 5 is provided with the shaft connection portion 511. It is provided on the outer peripheral surface of the shaft center 3. Preferably, the shaft connection portion 511 is connected between the shaft center portion 511 and the shaft center 3. The combination of lightning welding methods is used to improve the coupling stability of the motor case 51 and the shaft center 3. Among them, the thickness of the motor case 51 is preferably 0.1 mm or less, thereby preventing the overall weight of the rotor group 5 from being excessive.

Please refer to FIG. 1. In addition, in the axial direction corresponding to the bearing 2, the motor housing 51 has a lowest bottom edge 512, and the lowest bottom edge 512 has a minimum distance G from the highest surface 22 of the bearing 2. G is between 0.05mm ~ 0.16mm.

Referring to FIG. 1, the rotor group 5 may further have a magnetic element 52. The magnetic element 52 is disposed inside the motor case 51 and faces the coil assembly 42 of the stator group 4, so that the magnetic element 52 and the coil assembly 42 Opposite the axial direction.

Referring to FIG. 1, according to the foregoing structure, the shaft center 3 is rotatably coupled to the shaft hole 21 of the bearing 2, the rotor group 5 is connected to the shaft center 3, and the shaft center 3 can drive the rotor group. 5 Rotate synchronously. When the overall axial height H1 of the micromotor is constant, the axial distance between the bearing 2 and the motor case 51 is reduced by adjusting the axial distance between the bearing 2 and the motor case 51. , So that the minimum distance G between the highest surface 22 of the bearing 2 and the lowest bottom edge 512 of the motor housing 51 is between 0.05 mm and 0.16 mm. In this way, the axial combination of the bearing 2 and the shaft center 3 can be increased Height H2, to greatly improve the stability during rotation, to avoid the situation where the bearing 2 and the shaft center 3 rotate when rotating.

Please refer to FIG. 2, which is a second embodiment of the micromotor of the present invention. The second embodiment of the present invention is substantially the same as the first embodiment described above. The main difference is that the motor of the second embodiment of the present invention The housing 51 has a shaft-connecting flange portion 513 which is bent by the shaft-connecting portion 511 in a direction away from the bearing 2 and fits on the outer peripheral surface of the shaft center 3. In this way, the shaft connection flange portion 513 can make the combination of the motor case 51 and the shaft center 3 more stable, which can further improve the coupling stability between the rotor group 5 and the shaft center 3. In addition, the rotor group 5 may further include a magnetic member 53, the magnetic sealing member 53 is coupled between the motor case 51 and the magnetic element 52, and the thickness of the magnetic sealing member 53 is preferably 0.1 mm or less; Therefore, the motor case 51 and the magnetic seal Each of the pieces 53 can provide a magnetic sealing effect, thereby improving the overall magnetic sealing effect.

Please refer to FIG. 3, which is a third embodiment of the micromotor of the present invention. The third embodiment of the present invention is substantially the same as the first embodiment described above. The main difference is that the third embodiment of the present invention is The motor will be described as an example, and the motor housing 51 has a shaft connecting flange portion 513 which is bent by the shaft connecting portion 511 in the direction of the bearing 2 and fits on the outer peripheral surface of the shaft center 3 The shaft-connecting flange portion 513 is formed with the lowest bottom edge 512. In this way, the shaft connection flange portion 513 can make the combination of the motor case 51 and the shaft center 3 more stable, which can further improve the coupling stability between the rotor group 5 and the shaft center 3. In addition, the rotor group 5 may further include a magnetic member 53, the magnetic sealing member 53 is coupled between the motor case 51 and the magnetic element 52, and the thickness of the magnetic sealing member 53 is preferably 0.1 mm or less; Therefore, both the motor case 51 and the magnetic sealing member 53 can provide a magnetic sealing effect, thereby improving the overall magnetic sealing effect.

Please refer to FIG. 4, which is a preferred embodiment of the fan of the present invention. The fan has the above-mentioned micromotor and a blade group F. The fan group F is coupled around the motor casing 51 and is located at a position corresponding to the bearing 2. In the axial direction, the motor case 51 has a lowest bottom edge 512. The fan has a minimum gap G between the highest surface 22 of the bearing 2 and the lowest bottom edge 512 of the motor case 51. The design at 0.05mm ~ 0.16mm can increase the axial coupling height H2 of the bearing 2 and the shaft center 3 to improve the stability during rotation and avoid the occurrence of shaking when the bearing 2 and the shaft center 3 rotate. This can avoid operating noise and extend the overall life of the fan.

In summary, the micromotor and the fan of the present invention are used in an axial direction corresponding to a bearing, the motor housing has a lowest bottom edge, and a minimum distance between the lowest bottom edge and the highest surface of the bearing, and The minimum distance is between 0.05mm and 0.16mm. When the overall axial height of the micromotor is constant, the axial coupling height of the bearing and the shaft center can be increased to improve the stability during rotation. The operation of the micro motor is smoother and more stable, thereby preventing the operation noise and extending the overall service life of the fan.

Although the present invention has been disclosed using the above-mentioned preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications to the above embodiments without departing from the spirit and scope of the present invention. The technical scope protected by the invention, so the scope of protection of the present invention shall be determined by the scope of the appended patent application.

Claims (9)

A miniature motor includes: a base; a bearing provided on the base; the bearing having a shaft hole; in the axial direction of the bearing, the bearing has a highest surface; and a shaft center rotatably coupled to the shaft Holes; a certain subgroup, coupled to the base; and a rotor group, coupled to the shaft center, the rotor group has a motor housing, the motor housing has a lowest bottom edge in the axial direction corresponding to the bearing, the lowest There is a minimum distance between the bottom edge and the highest surface of the bearing, and the minimum distance is between 0.05mm ~ 0.16mm. The micro motor according to item 1 of the scope of patent application, wherein the motor housing has a shaft connection portion, and the shaft connection portion is connected to the outer peripheral surface of the shaft center by a lightning welding method. The micromotor according to item 2 of the scope of patent application, wherein the motor housing has a shaft-connecting flange portion, and the shaft-connecting flange portion is bent by the shaft-connecting portion toward the bearing and fits on the outer periphery of the shaft center. Surface, the shaft connecting flange portion is formed with the lowest bottom edge. The micromotor according to item 2 of the patent application scope, wherein the motor housing has a shaft-connecting flange portion, and the shaft-connecting flange portion is bent by the shaft-connecting portion in a direction away from the bearing and fits on the shaft center Peripheral surface. The micromotor according to item 1 of the scope of patent application, wherein the rotor group has a magnetic element and a magnetic piece, the magnetic element is provided inside the motor case, and the magnetic sealing element is combined between the motor case and the magnetic Between components. The micro motor according to item 5 of the scope of patent application, wherein the thickness of the magnetic sealing member is less than or equal to 0.1 mm. The micro motor according to item 1 of the scope of patent application, wherein the thickness of the motor casing is less than or equal to 0.1 mm. The micromotor according to item 1 of the scope of the patent application, wherein the shaft tube nozzle is formed by shrinking in a hot-melt manner to locate the bearing. A fan with a miniature motor is provided with the miniature motor according to any one of claims 1 to 8, and the fan further has several blades.