TW202232856A - Brushless motor assembly including a stator set, a rotor and a circuit board - Google Patents

Abstract

Disclosed is a brushless motor assembly, which includes a stator set, a rotor and a circuit board. The stator set includes a connection section, a stator core and a plurality of enameled wires, wherein the stator core has a first end and a second end opposite to one another. The first end is nearer to the connection section than the second end, and a plurality of cable grooves are arranged between the first end and the second end of the stator core, wherein each enameled wire is wound on each cable groove in order to form a plurality of stator winding sets; each enameled wire has two ends that extend from the first end toward the connection section; the rotor corresponds with the stator winding sets; the circuit board has a board body and a conductive wire set, wherein the board body connects to the connection section of the stator set, the conductive wire set is arranged to the board body in a layout manner and electrically connected to the two ends of each enameled wire, and the stator winding wire is electrically connected to the conductive wire set to form a connection configuration.

Description

brushless motor

The present invention is related to motor structure; in particular, it refers to a brushless motor.

With the advancement of science and technology, people have higher requirements for life, which in turn affects the development of electrical appliances, among which the motor is the focus of development. In order to improve the motor, there are many high-efficiency and low-loss motors on the market. Among them, the brushless motor is widely used in various electrical appliances because of its high efficiency and low noise. Both electric tools and household appliances are developing towards miniaturization, which hinders the development of technology due to the disadvantage of excessive size of the existing motors.

The conventional brushless motor includes a stator group and a rotor group. Taking a six-slot brushless motor as an example, the stator group includes a stator iron core, and the stator iron core is provided with six wire slots and three enameled wires. The enameled wires are respectively wound from one end of the stator iron core to the three wire slots in it, and then from the other end of the stator iron core to the other three wire slots on the opposite side, thereby forming six stator windings. A rotor of the rotor set passes through the stator core and is surrounded by the stator windings. By outputting commutation signals to the stator windings, the stator windings generate different magnetic field changes, so that the rotor is rotated by the magnetic field, so as to achieve the purpose of rotating the brushless motor.

However, the above-mentioned winding method of the stator winding is that each enameled wire is wound from one wire slot to another opposite wire slot, each enameled wire will have an enameled wire segment exposed at the other end of the stator core, and three enameled wires have three enameled wire segments exposed. At the other end of the stator iron core, the enameled wire segments at the other end of the stator iron core overlap and become disordered, and the length occupied by the enameled wire in the axial direction of the stator iron core increases. On the other hand, the stator windings of different brushless motors need to choose different winding methods according to different enameled wire connection configurations. The way of the wire trough is also different, and the enameled wire needs to be wound on the wire trough in different winding methods according to different connection configurations. For a more complicated connection configuration, the winding method is also more complicated, which will cause inconvenience in the manufacture of the brushless motor.

In view of this, the purpose of the present invention is to provide a brushless motor, which can shorten the length of the enameled wire in the axial direction of the stator iron core, and can simplify the winding method of the stator winding.

In order to achieve the above purpose, the present invention provides a brushless motor including a stator group, a rotor and a circuit board, the stator group includes a connecting part, a stator iron core and a plurality of enameled wires, the stator iron core has relatively a first end and a second end, the first end is closer to the connecting part than the second end, and the stator core has a plurality of different radial a wire slot, each of the enameled wires is wound on each of the wire slots to form a plurality of stator windings; each of the enameled wires has two ends, and the two ends of each of the enameled wires extend from the first end to the direction of the connection part; the The rotor corresponds to some stator windings; the circuit board has a board body and a wire set, the board body is connected to the connecting part of the stator set, the wire set has a plurality of wires, and the wires are arranged on the a plate body, and the wire group is electrically connected to both ends of the enameled wires, and the stator windings are electrically connected through the wire group to form a connection configuration.

The effect of the invention is that the two ends of the enameled wire are directly connected to the circuit board, thereby effectively shortening the length of the enameled wire in the axial direction of the stator iron core. Moreover, the configuration of the stator winding is determined by the layout on the circuit board, which effectively simplifies the winding method of the stator winding and makes the manufacture of the brushless motor easier.

In order to describe the present invention more clearly, preferred embodiments are given and described in detail with the drawings as follows. Referring to FIGS. 1 to 7 , a brushless motor according to a preferred embodiment of the present invention is shown, including a stator group 10 , a rotor 20 and a circuit board 22 .

The stator assembly 10 includes a stator core 12 , a plurality of enameled wires 14 and a connecting portion 16 a , wherein the stator core 12 has a first end 122 and a second end 124 opposite to each other, and the stator core 12 is located in the Between the first end 122 and the second end 124 are a plurality of wire grooves 126 located in different radial directions. In this embodiment, the wire grooves 126 are formed to extend radially inward and are located on the inner side. Each of the enameled wires 14 is wound on each of the wire slots 126 to form a plurality of stator windings 12a. In this embodiment, the winding directions of each of the enameled wires 14 on each of the wire grooves 126 are the same, for example, they are all wound in a clockwise direction, so as to reduce the winding procedure. In other embodiments, it is not excluded that the enameled wires 14 are also Different winding directions are possible. Each of the enameled wires 14 has two ends, and the two ends of each of the enameled wires 14 extend from the first end 122 to the direction away from the second end 124 . In other words, each of the enameled wires 14 is directed to the same side of the stator core 12 out.

In this embodiment, the stator group 10 further includes two insulating plates, which are hereinafter defined as a first insulating plate 16 and a second insulating plate 18 . The first insulating plate 16 is coupled to the first end 122 of the stator core 12 , and the second insulating plate 18 is coupled to the second end 124 of the stator core 12 . The first insulating plate 16 is disposed between the first end 122 of the stator core 12 and the circuit board 22 and has a plurality of screw holes 162 , and the screw holes 162 constitute the connecting portion 16 a. The connecting portion 16a is used for combining the circuit board. The first end 122 of the stator core 12 is closer to the connecting portion 16 a than the second end 124 . Both ends of each of the enameled wires 14 extend from the first end 122 to the direction of the connecting portion 16a and exceed the connecting portion 16a.

In addition, the first insulating plate 16 further has a plurality of fixing seats 164 , and the fixing seats 164 are located between the first end 122 of the stator core 12 and the circuit board 22 . Please refer to FIGS. 3 to 5 , each of the fixing seats 164 is located between two adjacent stator windings 12 a. In this embodiment, each of the fixing bases 164 has a body portion 164a and a hook portion 164b. The hook portion 164b extends radially outward from the body portion 164a and is adjacent to one end of the enameled wires 14 of the two stator windings 12a. The enameled wire 14 is bounded by the body portion 164a of the fixing seat 164 and then extends to the circuit board 22, and the enameled wire 14 is restricted in displacement by the hook portion 164b, whereby the enameled wire 14 can be fixed, avoid the enameled wire 14 from shaking, and increase the convenience during assembly. In other embodiments, the fixing seat 164 may not be disposed on the first insulating board 16 , and the enameled wire 14 is directly extended from the wire groove 126 to the circuit board 22 .

Please refer to FIG. 3 , the rotor 20 passes through the stator core 12 and corresponds to the stator windings 12a and is surrounded by the stator windings 12a. In this embodiment, the rotor 20 includes a magnet 202 and a rotating shaft 204. The magnet 202 is surrounded by the stator windings 12a. Two ends of the rotating shaft 204 extend to the outside of the first end 122 and the second end 124, respectively. And the rotating shaft 204 is combined with a fan 32 . In this embodiment, the slot 126 of the stator core 12 is located inside and surrounds the rotor 20 as an example. In other embodiments, the slot 126 can also be located outside, and the rotor is annular and surrounds the slot.

The circuit board 22 can be a single-layer or multi-layer printed circuit board circuit board. Please refer to FIG. 6 and FIG. 7 . The circuit board 22 has a board body 24 and a wire group 26 . The board body 24 is connected to the stator group 10 . the connecting part 16a. The board body 24 has a first surface 24 a and a second surface 24 b opposite to each other, and the first surface 24 a faces the first insulating board 16 . In this embodiment, the plate body 24 is fixed to the first insulating plate 16 by locking the bolts 30 into the screw holes 162 . The wire set 26 has a plurality of wires 262 . The wires 262 are arranged on the board body 24 in a printed circuit board layout, and the wire set 26 is electrically connected to both ends of the enameled wires 14 , such as Connect by soldering or spot welding to form a connection configuration. The circuit board 22 further includes three contact points 28 . The three contact points 28 are arranged on the board body 24 in a layout manner and are respectively located around the three through holes 242 of the board body 24 . The three contacts 28 are electrically connected to the wire set 26, and the three contacts 28 are used for connecting three-phase wires (U, V, W) to a motor drive circuit board (not shown), wherein the three-phase wires The three through holes 242 are respectively penetrated and electrically connected to the three contacts 28 by welding (eg, soldering or spot welding). In addition to the series Y-connection configuration shown in Figure 7, other circuit boards with different layouts can be provided to form a parallel Y-connection configuration with the stator windings, or as shown in Figure 8 The wire set 36 of the circuit board 34 and the stator winding 12a form a series delta connection configuration, or a parallel connection configuration. The foregoing four connection configurations are only examples, and the layout of the wire groups 26 on the circuit board 22 can be designed according to the actual required connection configurations. When changing the connection configuration, only the circuit board 22 needs to be replaced and electrically connected with the stator winding 12a.

The board body 24 of the circuit board 22 has a plurality of notches 244 , the notches 244 are formed concavely from the periphery of the board body 24 , and the enameled wires 14 of two adjacent stator windings 12 a extend to each of the notches 244. The wire set 26 may have two welding points (not shown) around each of the slots 244 for welding the two enameled wires 14 respectively. In the axial direction of the stator group 10 , the position of the orthographic projection range of each of the slots 244 is located between two adjacent stator windings 12 a , and at least a part of each of the fixing seats 164 is located at the projection of each of the slots 244 within the range. In more detail, referring to FIG. 5 , each of the cutting grooves 244 is divided into a first half-section cutting groove 244 a and a second half-section cutting groove 24 b , and the hook portion 164 b of each of the fixing bases 164 is located in each of the cutting grooves 244 The projection range of the first half of the notches 244a is located outside the projection range of the second half of the notches 244b of each of the notches 244 . By biasing to the side, there is more space between each hook portion 164b and each slot 244 , so that the enameled wire 14 is easier to extend into the slot 244 .

The brushless motor of the present embodiment may further include a plurality of Hall elements 38 . The Hall elements 38 are disposed on the first surface 24 a of the board body 24 of the circuit board 22 and located between the board body 24 of the circuit board 22 and the circuit board 22 . between the stator groups 10 . By combining the Hall element 38 on the circuit board 22 with the wire set, the brushless motor does not need to be combined with the circuit board with the Hall element, thereby reducing the axial length of the brushless motor. In other embodiments, a plurality of commutation switch elements (not shown) can also be arranged on the circuit board 22. Preferably, the commutation switch elements are arranged on the second surface of the board body 24 of the circuit board to facilitate the heat dissipation.

Thereby, outputting the commutation signal to the wire set 26 of the circuit board 22 can make the stator windings 12a generate different magnetic field changes, so that the rotor 20 is rotated by the magnetic field, so as to achieve the purpose of rotating the brushless motor.

According to the above, the enameled wires 14 of the stator winding 12a of the brushless motor of the present invention all exit from the same side of the stator iron core 12, and the stator winding 12a is electrically connected to a predetermined through the wire group 26 of the circuit board 22. Connection configuration. Compared with the conventional brushless motor, the brushless motor of the present invention can reduce the length occupied by the enameled wire 14 in the axial direction of the stator core 12, and effectively simplify the winding method of the stator winding 12a.

The above descriptions are only preferred feasible embodiments of the present invention, and any equivalent changes made by applying the description of the present invention and the scope of the patent application should be included in the patent scope of the present invention.

[this invention] 10: stator group 12: stator core 12a: stator winding 122: First End 124: Second End 126: Wire slot 14: Enameled wire 16: The first insulating plate 16a: Connection part 162: screw hole 164: Fixed seat 164a: body part 164b: Hook 18: Second insulating plate 20: Rotor 202: Magnet 204: Spindle 22: circuit board 24: Board body 24a: First surface 24b: Second surface 242: Through hole 244: Grooving 244a: 1st half grooving 244b: 2nd half groove 26: Wire set 262: Wire 28: Contact 30: Bolts 32: Fan 34: circuit board 36: Wire Set 38: Hall element

FIG. 1 is a perspective view of a brushless motor according to a preferred embodiment of the present invention. FIG. 2 is a partially exploded perspective view of the brushless motor according to the above preferred embodiment. FIG. 3 is a front view of the stator assembly and the rotor assembly according to the above preferred embodiment, wherein the enameled wire is omitted. FIG. 4 is a partial enlarged view of part A of FIG. 1 . FIG. 5 is a side view of FIG. 4 with the enameled wire hidden. FIG. 6 is a front view of the brushless motor of the above preferred embodiment. FIG. 7 is a schematic diagram of a series Y-connection configuration of one of the preferred embodiments described above. FIG. 8 is a schematic diagram of a series delta connection configuration according to one of the above preferred embodiments.

10: stator group

12: stator core

122: First End

124: Second End

14: Enameled wire

16: The first insulating plate

164: Fixed seat

18: Second insulating plate

20: Rotor

22: circuit board

24: Board body

24b: Second surface

30: Bolts

32: Fan

Claims (11)

A brushless motor comprising: The stator group includes a connecting portion, a stator iron core and a plurality of enameled wires, the stator iron core has a first end and a second end opposite to each other, the first end is closer to the connecting portion than the second end, and The stator core has a plurality of wire slots located in different radial directions between the first end and the second end, and each of the enameled wires is wound on each of the wire slots to form a plurality of stator windings; each of the enameled wires has two end, and both ends of each of the enameled wires extend from the first end to the direction of the connecting portion; A rotor, corresponding to some stator windings; A circuit board has a board body and a wire set, the board body is connected to the connecting part of the stator set, the wire set has a plurality of wires, the wires are arranged on the board body in a layout manner, and the wires The two ends of each of the enameled wires are electrically connected by the group, and the stator windings are electrically connected through the wire group to form a connection configuration. The brushless motor of claim 1, wherein the stator group includes a plurality of fixing seats, the fixing seats are arranged between the first end of the stator iron core and the circuit board, and each fixing seat is located at two adjacent two One end of the enameled wire between two adjacent stator windings is wound around the fixing seat and then extends to the circuit board. The brushless motor of claim 2, wherein the stator set includes an insulating plate, the insulating plate is disposed between the first end of the stator core and the circuit board, the insulating plate has the connecting portion and the Fixed seat. The brushless motor of claim 2, wherein each of the fixing bases has a body portion and a hook portion, and the hook portion extends radially outward from the body portion; one end of the enameled wires of two adjacent stator windings It is tied around the main body of the fixing seat and is restricted in displacement by the hook. The brushless motor as claimed in claim 4, wherein the board body of the circuit board has a plurality of cut grooves, the cut grooves are formed concavely from the periphery of the board body, and the enameled wires of two adjacent stator windings extend into each of the cut grooves; at least a part of each of the fixed seats is located within the projected range of each of the cut grooves. The brushless motor as claimed in claim 5, wherein each of the grooves is divided into a first half of the groove and a second half of the groove, and the hook of each of the fixing bases is located in the first half of each of the grooves is within the projection range of the partial slot and is located outside the projection range of the second half slot of each slot. The brushless motor of claim 1, wherein the board body of the circuit board has a plurality of slots, the slots are recessed from the periphery of the board body, and the enameled wires of two adjacent stator windings extend into each slot. The brushless motor of claim 7, wherein the position of the orthographic projection range of each of the slots is located between two adjacent stator windings. The brushless motor of claim 1, wherein the circuit board includes three contacts, the three contacts are arranged on the board body in a layout manner, and the three contacts are electrically connected to the wire set. The brushless motor of claim 1 includes a plurality of Hall elements, and the Hall elements are disposed on the board body of the circuit board and located between the board body of the circuit board and the stator group. The brushless motor according to claim 1, wherein the winding directions of each of the enameled wires on each of the wire grooves are the same.

Images