TWI384722B - Miniature motor - Google Patents

Description

Micro motor

The present invention relates to a motor, and more particularly to a micromotor that reduces overall axial height and reduces volume.

The conventional motor commonly used in the market generally consists of a stator and a rotor, wherein the stator is composed of a coil, a circuit board or other related components; in general, the coil of the conventional motor is convexly disposed on The surface of the circuit board, therefore, makes it difficult for the conventional motor to further reduce the overall axial height. If the conventional motor is applied to a field such as a cooling fan, the conventional cooling fan will be designed to be lighter, thinner and shorter. Feasibility. The following are some of the problems that may be derived from the application of conventional motors to various types of cooling fans:

Conventional cooling fan, such as the Chinese patent No. 200610072272.8 "thin heat dissipation mechanism" invention patent. As shown in the first and second embodiments, the conventional heat dissipation fan 8 includes a frame 81. The cover 81 has a cover 82. The frame 81 has an accommodation space 811. The 811 has a base 812. The base 812 can be provided with a circuit board 83 and a coil 84. In addition, the base 812 is provided with at least two positioning elements 85, and a shaft is protruded from the center of the base 812. a tube 813, the shaft tube 813 is coupled to the accommodating space 811 of the frame 81, wherein the inner side of the rotor 86 has a magnet 861, so that a magnetic interlinkage can be generated between the coil 84 and the magnet 861. In order to drive the rotor 86 to rotate. Thereby, the conventional cooling fan 8 can be installed in various electronic devices or electronic instruments to provide a predetermined heat dissipation effect.

In general, today's electronic products have generally been developed in the direction of miniaturization, etc. However, since the coil 84 of the conventional cooling fan 8 is convexly disposed on the surface of the circuit board 83, the coil 84 and the circuit board are caused. The two still form a certain axial height together, so that the cooling fan 8 having the coil 84 and the circuit board 83 is difficult to further reduce the overall axial height; therefore, the cooling fan 8 is also designed to be lighter and thinner than the limited reduction. The feasibility of shortening is difficult to install in micro-electronic devices or electronic instruments.

Another conventional cooling fan, such as the Republic of China Announcement No. I293106 "Thin Fan" invention patent. Referring to FIGS. 3 and 4, the conventional cooling fan 9 includes a base 91, a fan wheel 92, a piece of magnet 93, and a shaft 94. The base 91 is provided with a shaft hole 911 and a coil assembly 912. The fan wheel 92 has a plurality of bending rotors 921. The sheet magnet 93 is coupled to the bottom of the fan wheel 92. One end of the shaft 94 is inserted therein. The shaft hole 911 of the base 91 is coupled to the fan wheel 92 at the other end. Therefore, the conventional heat dissipation fan 9 can also be installed in various electronic devices or electronic instruments to provide a predetermined heat dissipation effect.

However, the pedestal 91 and the coil assembly 912 of the above-mentioned conventional cooling fan 9 still form a certain axial height together, which makes it difficult for the conventional cooling fan 9 to further reduce the overall axial height, and is also relatively limited. Designed to be more lightweight and shorter, it is not suitable for micro-electronic devices or electronic instruments, so there is still a need for improvement.

The present invention provides a micromotor for solving the problem that the conventional motor is not easily designed toward the miniaturization direction, and is the main object of the invention.

A miniature motor includes a substrate, a shaft seat and a rotor. The substrate comprises a wiring layer and a surface layer, the wiring layer forms a coil group, the surface layer is combined with the wiring layer; the shaft seat is located on the substrate; the rotor comprises a central shaft and a permanent magnet, the central shaft is coupled to the shaft The permanent magnet is opposite to the coil set, and the permanent magnet has an air gap between the surface layer of the substrate. Thereby, the coil set can be integrated inside the substrate, so that the coil set can be located outside the air gap to achieve the effects of reducing axial height and reducing structural complexity.

The coil assembly is electrically connected to a driving circuit. Thereby, the drive circuit can be used to actuate the coil assembly to drive the rotor to rotate.

The wiring layer of the substrate is composed of a plurality of circuit layers stacked on each other, and the coil group includes a plurality of coils electrically connected to each other, and each of the coils is formed on a surface of each of the circuit layers. In this way, more coils can be wound around, thereby achieving the effects of increasing the speed and torque.

A circuit laying area is formed between any two adjacent coils of one of the circuit layers of the substrate, and the driving circuit is disposed in the circuit laying area. Thereby, the effect of reducing the structure and assembly complexity is achieved.

The substrate further includes a bottom layer opposite to the surface layer and bonded to the wiring layer, the wiring layer is located between the bottom layer and the surface layer; the surface layer and the bottom layer may be an insulating layer; in addition, the plurality of circuit layers There may also be an insulating layer between each. Thereby, an insulation effect can be provided to ensure that the micromotor can operate normally.

The substrate is provided with a through hole, and the shaft seat is coupled into the through hole. Thereby, the effect of improving assembly convenience can be achieved.

The shaft seat is integrally formed on the substrate. Thereby, the effect of the streamlined structure can be achieved.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

Referring to Figures 5 and 6, the micromotor of the first embodiment of the present invention comprises a substrate 10, a shaft base 20 and a rotor 30. among them:

The substrate 10 includes a wiring layer 11 and a surface layer 12, and the substrate 10 is preferably selected from a printed circuit board. The wiring layer 11 may be integrally formed with a coil group 13. For example, the wiring layer 11 may be formed by a wiring pattern, and the coil group 13 includes a plurality of coils 131 electrically connected to each other; The surface layer 12 is bonded to the wiring layer 11, and the surface layer 12 may be an insulating layer (not shown) formed on the surface of the wiring layer 11. In addition, the substrate 10 preferably further includes a bottom layer 14 opposite to the surface layer 12 and bonding the wiring layer 11 so that the wiring layer 11 can be located between the bottom layer 14 and the surface layer 12, and the bottom layer 14 is also It may be an insulating layer (not shown) formed on the surface of the wiring layer 11, whereby a better insulating function of the substrate 10 can be provided.

Moreover, the coil assembly 13 is electrically connected to a driving circuit (not shown), and the driving circuit can be directly disposed on the substrate 10; or the driving circuit and the substrate 10 can be substantially not in contact with each other, and then externally connected. The method is electrically connected to the coil assembly 13. In addition, as shown in FIG. 5, the substrate 10 is preferably provided with a through hole 15 through which the wiring layer 11 and the bottom layer 14 are axially penetrated, whereby the through hole 15 can be combined with the through hole 15 The shaft base 20; or the substrate 10 can also omit the design of the through hole 15, and directly form the shaft base 20 on the substrate 10, and the coils 131 of the coil assembly 13 preferably surround the shaft seat 20 around.

The rotor 30 includes a central shaft 31 and a permanent magnet 32. The central shaft 31 is coupled to the shaft base 20 such that the rotor 30 can be rotated on the base plate 10; the permanent magnet 32 is opposite to the coil assembly 13, and the permanent magnet 32 has a gas between the surface layer 12 of the substrate 10. Gap (not labeled)

In the actual use of the micromotor of the present invention, the substrate 10 and the axle housing 20 can be combined with a frame (not shown), and the outer circumferential surface of the rotor 30 can also form a plurality of blades (not shown) to form a Cooling fan. Thereby, the driving circuit can actuate the coil assembly 13 to cause a magnetic interlinking action between the coil assembly 13 and the permanent magnet 32, thereby driving the rotor 30 to rotate to drive the airflow for heat dissipation by the rotor 30. . In addition, the application level of the micromotor of the present invention is not limited to the field of the cooling fan, but can also be applied to other related fields that must be driven by the motor.

The main features of the micromotor of the present invention mainly include: a structure in which the coil group 13 is located on one side of the surface layer 12, and the coil assembly 13 is integrally combined with the wiring layer 11 to make the coil The group 13 can be integrated inside the substrate 10 to ensure that the coil assembly 13 does not protrude from the surface layer 12 of the substrate 10; more importantly, the coil assembly 13 can be located on the surface layer 12 of the permanent magnet 32 and the substrate 10. In addition to the air gap formed between them, there is no coil structure between the permanent magnet 32 of the rotor 30 and the surface layer 12 of the substrate 10; in addition, the coil group 13 is integrated in the wiring manner. Under the condition of the inside of the substrate 10, the axial height of the substrate 10 is not excessively increased, that is, the overall axial height of the micromotor of the present invention can be reduced, and the advantages of the structural complexity are reduced; therefore, when When the base plate 10 and the rotor base 30 constitute the micromotor of the present invention, the overall axial height of the micromotor of the present invention can be relatively reduced, so that the micromotor of the present invention can be developed in a direction that is lighter, thinner and shorter. meter.

Referring to FIG. 7, the micromotor of the second embodiment of the present invention also includes a substrate 40, a shaft base 20 and a rotor 30. The present embodiment discloses that the shaft base 20 is integrally formed with the base plate 40, and the shaft is formed. The overall structure of the seat 20 and the rotor 30 is the same as that of the first embodiment described above, and will not be described again.

Referring to FIGS. 7 and 8, the substrate 40 of the second embodiment of the present invention has a wiring layer 41 mainly composed of a plurality of circuit layers superposed on each other; in the embodiment shown in the figure. The wiring layer 41 is composed of a first circuit layer 41a, a second circuit layer 41b, a third circuit layer 41c, and a fourth circuit layer 41d. The wiring layer 41 formed by the plurality of circuit layers 41a, 41b, 41c, and 41d can also be combined with a surface layer 42 and a bottom layer 44. The surface layer 42 and the bottom layer 44 are preferably insulated from the surface of the wiring layer 41. a layer (not shown), the wiring layer 41 may be located between the surface layer 42 and the bottom layer 44, and an insulating layer may be disposed between the plurality of circuit layers 41a, 41b, 41c, and 41d (not shown) ). Further, in the substrate 40, a coil group 43 can be formed on the wiring layer 41 by a wiring pattern, and the coil group 43 includes a plurality of coils 431 electrically connected to each other.

The circuit design of the substrate 40 is formed by the plurality of circuit layers 41a, 41b, 41c, and 41d, and the surfaces of the plurality of circuit layers 41a, 41b, 41c, and 41d can be respectively formed by using a layout. 431, in order to increase the number of windings of each of the coils 431, thereby, the micromotor of the present invention under the condition that the overall axial height of the substrate 40 is not excessively increased, and the radial width dimension of the substrate 40 is constant. It is possible to wind more coils 431, thereby increasing the rotational speed and torque, and also developing the design in a direction that is lighter, thinner and shorter.

Moreover, as shown in FIG. 8, the coil assembly 43 can also directly form a driving circuit 45 on any one of the circuit layers; in the embodiment shown in the figure, the driving is disposed on the surface of the first circuit layer 41a. The circuit 45, the first circuit layer 41a can form a circuit laying area (not labeled) between any two adjacent coils 431, so that the driving circuit 45 has sufficient space to be disposed on the surface of the first circuit layer 41a. The laying zone; thereby, when the driving circuit 45 is also integrated on the substrate 40, the advantages of reduced structure and assembly complexity can be achieved.

As described above, the micromotor of the present invention can be integrally formed on one side of the surface layers 12, 42 by the coil sets 13, 43 of the substrates 10, 40, and the structure in which the wiring layers 11, 41 are integrally bonded to the wiring layers 11, 41 The design is designed to effectively reduce the axial height of the micromotor of the present invention, and relatively reduce the overall volume of the micromotor, thereby achieving the function of facilitating development of the design toward the miniaturization direction.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

[this invention]

10. . . Substrate

11. . . Wiring layer

12. . . surface layer

13. . . Coil set

131. . . Coil

14. . . Bottom layer

15. . . Through hole

20. . . Shaft seat

30. . . Rotor

31. . . The central axis

32. . . permanent magnet

40. . . Substrate

41. . . Wiring layer

41a, 41b, 41c, 41d. . . Circuit layer

42. . . surface layer

43. . . Coil set

431. . . Coil

44. . . Bottom layer

45. . . Drive circuit

[知知]

8. . . Cooling fan

81. . . framework

811. . . Housing space

812. . . Pedestal

813. . . Shaft tube

82. . . Cover

83. . . Circuit board

84. . . Coil

85. . . Positioning element

86. . . Rotor

861. . . magnet

9. . . Cooling fan

91. . . Pedestal

911. . . Shaft hole

912. . . Coil set

92. . . Fan wheel

921. . . Rotor

93. . . Sheet magnet

94. . . Shaft

Figure 1: An exploded perspective view of the first type of cooling fan.

Figure 2: A cross-sectional view of a combination of the first type of cooling fan.

Figure 3: An exploded perspective view of a second type of cooling fan.

Figure 4: A cross-sectional view of a combination of a conventional second type of cooling fan.

Fig. 5 is an exploded perspective view showing the micromotor of the first embodiment of the present invention.

Fig. 6 is a sectional view showing the combination of the micromotor of the first embodiment of the present invention.

Fig. 7 is an exploded perspective view showing the micromotor of the second embodiment of the present invention.

Fig. 8 is an exploded perspective view showing the substrate of the micromotor of the second embodiment of the present invention.

10. . . Substrate

11. . . Wiring layer

12. . . surface layer

13. . . Coil set

131. . . Coil

14. . . Bottom layer

15. . . Through hole

20. . . Shaft seat

30. . . Rotor

31. . . The central axis

32. . . permanent magnet

Claims (7)

A micromotor comprising: a substrate comprising a wiring layer and a surface layer, the surface layer being combined with the wiring layer, the wiring layer of the substrate being composed of a plurality of circuit layers superposed on each other, the wiring layer forming a coil group, the coil The group includes a plurality of coils electrically connected to each other, each of the coils being respectively formed on a surface of each of the circuit layers, the coil group being electrically connected to a driving circuit, and any two adjacent coils of one of the circuit layers of the substrate are formed a circuit laying area, the driving circuit is disposed in the circuit laying area; a shaft seat is located on the substrate; and a rotor includes a central shaft and a permanent magnet, the central shaft is coupled to the shaft seat, the permanent magnet and the coil The set has an air gap between the permanent magnet and the surface layer of the substrate; wherein the coil set is located outside the air gap. The micromotor of claim 1, wherein each of the plurality of circuit layers is provided with an insulating layer. The micromotor of claim 1 or 2, wherein the surface layer of the substrate is an insulating layer. The micromotor according to claim 1 or 2, wherein the substrate further comprises a bottom layer opposite to the surface layer and bonded to the wiring layer, the wiring layer being located between the bottom layer and the surface layer. The micromotor of claim 4, wherein the bottom layer of the substrate is an insulating layer. a micromotor according to claim 1 or 2, wherein The substrate is provided with a through hole, and the shaft seat is coupled into the through hole. The micromotor of claim 1 or 2, wherein the axle seat is integrally formed on the substrate.