TW201440394A - Brushless motor - Google Patents

Abstract

A brushless motor includes a stator iron core, a rotor, a protection cover, a first circuit substrate and a second circuit substrate, wherein, the stator iron core is ring-shaped; and the rotor is located in the stator iron core; and the protection cover has a positioning post combined at on side of the stator iron core; and the first circuit substrate is disposed in the protection cover and has a first positioning hole for fitting the positioning post; and the first circuit substrate is provided with a first circuit and a first conducting element connected to the first circuit; and the second circuit substrate is disposed in the protection cover and fixed to the end of the positioning post; and the second circuit substrate is provided with a second circuit and a second conductive element connected to the second circuit: and the second conductive element is connected to the first conductive element such that a rigid connection between the second circuit substrate and the first circuit substrate is provided.

Description

Brushless motor

The invention relates to a motor; in particular to a brushless motor.

According to the current power motors used in many electric motors, most of them are mainly Brushless DC motors (BLDCM), and permanent magnet type brushless DC motors are mainly used for permanent magnet brushless DC motors. It has the advantages of high torque-to-inertia inertia ratio and no permanent magnet DC motor (for example: brush wear, reversing spark and long heat dissipation path).

The common structure of the conventional brushless motor is shown in the Republic of China Announcement Nos. M333005 and M423397. Although the structure disclosed in the patent No. M333005 can achieve the purpose of increasing the heat dissipation effect, since the circuit substrate is exposed, the high-speed rotation and vibration during the operation of the motor easily cause the circuit substrate to collide with other devices and be damaged. In addition, in addition to the above disadvantages, in order to stabilize the circuit substrate, it is common to use ten or more bolts to lock the circuit substrates, which makes maintenance disassembly or assembly troublesome and time consuming. The M423397 patent is designed with a housing to protect the circuit board from damage caused by collision with other devices. However, the housing is designed with a long cylindrical shape. Although it completely covers the internal components, the motor is also dismantled. The solution and assembly are more complicated and difficult, and the efficiency of disassembly and assembly cannot be improved.

In view of the above, the object of the present invention is to provide a brushless motor which has the advantages of good heat dissipation effect, assembly with less bolts, and quick disassembly and assembly.

In order to achieve the above object, the brushless motor of the present invention comprises a stator core, a rotor, a cover, a first circuit substrate and a second circuit substrate. Wherein, the stator core is annular; the rotor has a rotating shaft and a coil set, and the coil set is located in the stator core; the cover has a cover plate and a wall surrounding the cover plate, and the cover plate and The wall is surrounded by a receiving space; at least one positioning post protrudes from the cover plate and is located in the receiving space; in addition, the wall of the cover is coupled to one side of the stator core; a circuit board is disposed in the cover, and has a first positioning hole, and the first positioning hole is sleeved on the positioning post; the first circuit substrate is provided with a first circuit and a first guiding The second circuit substrate is disposed in the cover and is fixed on the end of the positioning post; the second circuit substrate is provided with a second circuit and a second guiding component to connect the first circuit The second circuit: the second guiding component is connected to the first guiding component to rigidly connect the second circuit substrate and the first circuit substrate.

Thereby, through the above-mentioned structural design, the brushless motor can have the advantages of good heat dissipation effect, assembly with less bolts, and quick disassembly and assembly.

10‧‧‧First cover

10a‧‧‧ cover

10b‧‧‧ wall

11‧‧‧ Ventilation opening

12‧‧‧ Positioning column

121‧‧‧ screw holes

13‧‧‧ hole

14‧‧‧ screw holes

15‧‧‧First bump

20‧‧‧First circuit board

21‧‧‧ pins

22‧‧‧Metal Oxide Semiconductor Field Effect Transistor

23‧‧‧Solid copper sheet

24‧‧‧through holes

25‧‧‧ventilation holes

26‧‧‧First positioning hole

27‧‧‧ hole

30‧‧‧Second circuit substrate

31‧‧‧ needle seat

32‧‧‧Second positioning hole

33‧‧‧ hole

40‧‧‧ Stator core

41‧‧‧First perforation

42‧‧‧ Groove

50‧‧‧ coil group

60‧‧‧ shaft

70‧‧‧fan

80‧‧‧Second cover

81‧‧‧ Ventilation opening

82‧‧‧Second perforation

83‧‧‧second bump

84‧‧‧ hole

100‧‧‧ bolt

110‧‧‧ bolt

1 is a perspective view of a preferred embodiment of the present invention; FIG. 2 is an exploded view of a preferred embodiment of the present invention; FIG. 3 is a perspective view of the first cover of the preferred embodiment; FIG. 5 is a perspective view of the first cover separated from each circuit board; FIG. 6 is a perspective view of the first cover combined with each circuit board.

In order to explain the present invention more clearly, the preferred embodiment will be described in detail with reference to the accompanying drawings. Referring to FIG. 1 and FIG. 2, a brushless motor according to a preferred embodiment of the present invention includes a first The cover 10, a first circuit substrate 20, a second circuit substrate 30, a stator core 40, a coil assembly 50, a rotating shaft 60, a fan 70, and a second cover 80. Wherein, referring to FIG. 3, the first cover 10 has a cover 10a and a wall 10b disposed around the cover 10a, and the cover 10a and the wall 10b define a receiving space. In addition, a plurality of ventilation openings 11 are defined in the wall 10b, and three positioning posts 12 are protruded from the inner surface of the cover 10b of the first cover 10. The ends of the positioning posts 12 respectively have a screw hole 121. In addition, the first cover 10 has a hole 13 in the area surrounding the positioning post 12 on the cover 10b, and the first cover 10 further has four screw holes disposed around the outer circumference of the wall 10b. 14. Furthermore, the first cover 10 has two first bumps 15 on the wall 10b.

The first circuit substrate 20 is provided with a first circuit, which is a driving circuit, and the first circuit substrate 20 has a plurality of first guiding elements electrically connected to the driving circuit, which is inserted in this embodiment. Needle 21. Referring to FIG. 4, the driving circuit has a plurality of metal oxide semiconductor field effect transistors (MOSFETs) 22 mounted on one side of the first circuit substrate 20, and the first circuit substrate 20 is opposite to the other side. A plurality of heat-dissipating copper sheets 23 are respectively disposed at the position, and the first circuit substrate 20 is provided with a plurality of through holes 24 between the metal oxide semiconductor field effect transistor 22 and the heat-dissipating copper sheet 23, and the through holes are 24 is filled with solder, and the metal is connected to the metal oxide semiconductor field effect transistor 22 and the heat dissipation copper sheet 23. The first circuit substrate 20 has a vent hole 25 in the vicinity of each of the metal oxide semiconductor field effect transistors 22 and each of the heat dissipation copper sheets 23, and the aperture of the vent hole 25 is larger than the aperture of each of the through holes 24. In addition, the first circuit substrate 20 has three first positioning holes 26, and the aperture of each of the first positioning holes 26 is slightly larger than each of the screws. The aperture of the aperture 121 is smaller than the outer diameter of each of the positioning posts 12. Of course, in other implementations, the aperture of the first positioning hole may also be equal to the aperture of the through hole. Furthermore, the first circuit substrate 20 further has a hole 27 in the area surrounded by the first positioning holes 26.

The second circuit substrate 30 is provided with a second circuit, which is a control circuit, and the second circuit substrate has a plurality of second guiding elements electrically connected to the control circuit, which is a needle holder in this embodiment. 31. In addition, the second circuit substrate 30 has three second positioning holes 32, and the aperture of each of the second positioning holes 32 is slightly larger than the outer diameter of each of the positioning posts 12. Of course, in other implementations, the aperture of the second positioning hole may also be equal to the outer diameter of the positioning post. Furthermore, the second circuit substrate 30 further has a hole 33 in a region surrounded by the second positioning holes 32.

Therefore, referring to FIG. 5 and FIG. 6 , when the user assembles, the pins 21 of the first circuit substrate 20 can be respectively inserted into the corresponding needle holders 31 of the second circuit substrate 30 to make the first The circuit board 20 is rigidly connected to the second circuit board 30, and the driving circuit is electrically connected to the control circuit. Then, the first circuit board 20 and the second circuit board 30 are placed in the receiving space of the first cover 10, and the positioning posts 12 are respectively disposed in the second positioning holes 32. The first circuit substrate 20 is lightly attached to the ends of the positioning posts 12 such that the screw holes 121 on the positioning posts 12 are aligned with the first positioning holes 26. At this time, the user can use the three bolts 100 to pass through the first positioning holes 26 respectively, and then combine with the corresponding screw holes 121 to adhere the first circuit substrate 20 to the positioning posts 12. Therefore, after the first circuit substrate 20 is locked to the positioning posts 12 by the rigid connection between the first circuit substrate 20 and the second circuit substrate 30, the second circuit substrate 30 is It can be stably disposed in the first cover 10 (as shown in FIG. 6). In addition, the assembler can directly weld or assemble the vent holes 11 directly through the first cover. Electronic components on the circuit boards 20, 30.

The stator core 40 is a ring-shaped metal member and has four first through holes 41 disposed around its outer annular surface. In addition, a groove 42 is formed on the stator core 40.

When the user assembles, the wall 10b of the first cover 10 on which the two circuit boards 20 and 30 are mounted can be connected to one side of the stator core 40, and the first bumps 15 are respectively disposed on the side. In the groove 42.

The coil assembly 50 is disposed on the rotating shaft 60, and is disposed in a region surrounded by the stator core 40 when assembled. At this time, the end of the positioning post 12 faces the coil assembly 50, and one end of the rotating shaft 60 will Extending through the holes 33, 27, 13 to the outside of the first cover 10. The coil assembly 50 is coupled to the drive circuit and is drivable by the drive circuit to rotate relative to the stator core 50 and simultaneously rotate the rotary shaft 60.

The fan 70 is mounted on the rotating shaft 60 and can be rotated by the rotating shaft 60.

The second cover 80 has a plurality of ventilation openings 81, and the second cover 80 has four second perforations 82 disposed around its outer periphery. In addition, the second cover 80 has two second protrusions 83 thereon. Furthermore, the second cover 80 has a hole 84 at the center of the bottom.

At this time, the user can connect the second cover 80 to the other side of the stator core 40 so that the second protrusions 83 are respectively disposed in the grooves 42. At this time, the second through holes 82 will face the first through holes 41 and the screw holes 14 respectively, so that the user can use the four screws 110 to pass through the second holes 82 respectively. After the first through hole 41 is screwed into the corresponding screw hole 14, the first cover 10 and the second cover 80 are firmly fixed to the stator core 40, and the other end of the rotating shaft 60 is fixed. The hole 84 passing through the second cover 80 is connected to a member to be rotated (such as a gear, a rim, etc., not shown), and the coil assembly 50 is stably disposed on the stator. In the core 40, to achieve the purpose of assembly.

In this way, it can be seen from the above description that the brushless motor of the present invention has the advantages of rapid assembly, and the design of the groove 42 and the bumps 15 and 83 can achieve rapid alignment during assembly. The effect of foolproof. In addition, when the brushless motor is in operation, the heat dissipation can be achieved by the ventilation openings 11, 81. As can be seen from FIG. 4, when the brushless motor is operated to drive the fan 70 to rotate, the The design of the heat-dissipating copper sheet 23 and the venting holes 25 can further utilize the heat conduction and the heat convection to rapidly remove the waste tropical water on each of the metal-oxide-semiconductor field-effect transistors 22, thereby preventing each of the metals. The oxide semiconductor field effect transistor 22 is burnt due to overheating. Moreover, the protection of the first cover 10 can prevent the circuit boards 20 and 30 from colliding with other devices and being damaged and destroyed.

It should be noted that the above description is only a preferred embodiment of the present invention, and is not limited thereto. For example, a plurality of screw holes may be disposed on the second cover, and perforations are provided on the first cover, so that the bolts 110 are fixed in a manner opposite to the foregoing embodiment to fix the covers and the stator. The purpose of the iron core 40. In addition, the position of the driving circuit and the control circuit of the present invention may be reversely disposed, that is, the control circuit is disposed on the first circuit substrate, and the driving circuit is disposed on the second circuit substrate to achieve the foregoing control and driving purposes. In addition, the equivalents of the specification and the scope of the patent application are intended to be included in the scope of the invention.

10‧‧‧First cover

11‧‧‧ Ventilation opening

12‧‧‧ Positioning column

14‧‧‧ screw holes

15‧‧‧First bump

20‧‧‧First circuit board

21‧‧‧ pins

22‧‧‧Metal Oxide Semiconductor Field Effect Transistor

26‧‧‧First positioning hole

27‧‧‧ hole

30‧‧‧Second circuit substrate

31‧‧‧ needle seat

32‧‧‧Second positioning hole

33‧‧‧ hole

40‧‧‧ Stator core

41‧‧‧First perforation

42‧‧‧ Groove

50‧‧‧ coil group

60‧‧‧ shaft

70‧‧‧fan

80‧‧‧Second cover

81‧‧‧ Ventilation opening

82‧‧‧Second perforation

83‧‧‧second bump

84‧‧‧ hole

110‧‧‧ bolt

Claims (13)

A brushless motor comprising: a stator core, in the form of a ring; a cover having a cover and a wall surrounding the cover, and the cover and the wall enclosing a receiving space; at least one a positioning post protruding from the cover plate and located in the receiving space; in addition, the wall of the cover is coupled to one side of the stator core; a rotor having a rotating shaft and a shaft disposed on the rotating shaft a coil assembly, wherein the coil assembly is located in the stator core; a first circuit substrate is disposed in the cover and has a first positioning hole, and the first positioning hole is sleeved on the positioning post; a first circuit and a first guiding component are connected to the first circuit; and a second circuit substrate is disposed in the cover and fixed on the end of the positioning post; the second a second circuit and a second guiding component are connected to the second circuit; the second guiding component is connected to the first guiding component to make the second circuit substrate rigid with the first circuit substrate connection. The brushless motor of claim 1, wherein the end of the positioning post has a screw hole, and the second circuit substrate has a second positioning hole; the second circuit substrate passes through the second positioning by a bolt The hole is combined with the screw hole and fixed to the end of the positioning post. The brushless motor of claim 2, wherein the aperture of the first positioning hole is greater than or equal to the outer diameter of the positioning post; the aperture of the second positioning hole is greater than or equal to the aperture of the screw hole, and is smaller than the positioning column The outer diameter. The brushless motor of claim 1, wherein the first circuit is configured to drive the coil set relative to the stator core rotator; the second circuit is configured to control the driver circuit operator. The brushless motor of claim 1, wherein the second circuit is configured to drive the coil set relative to the stator core rotator; the first circuit is configured to control the driver circuit operator. The brushless motor of claim 1, wherein the cover has a hole, and one end of the shaft protrudes from the hole. The brushless motor of claim 1, wherein the stator core has a recess; the wall of the cover has a bump coupled to the recess. The brushless motor of claim 1 further has another cover coupled to the other side of the rotor core, and the other cover has a hole, and one end of the shaft protrudes from the hole. The brushless motor of claim 8, further comprising a fan disposed in one of the two covers and connected to the rotating shaft and rotatable by the rotating shaft. The brushless motor of claim 8, wherein the stator core has a first through hole; the two covers respectively have a second through hole and a screw hole; a screw passes through the second through hole and the first through hole Screwed into the screw hole. The brushless motor of claim 8, wherein the stator core has a groove; and the two covers respectively have a bump coupled to the groove. The cover structure of claim 1, wherein the wall has a plurality of ventilation openings. The cover structure of claim 1, wherein the first guiding element is a pin; the second guiding element is a pin holder; the pin is inserted into the socket to make the second circuit substrate The first circuit substrate is rigidly connected.