Axial field motor and stator therefor

Abstract

The application provides an axial magnetic field motor and a stator thereof, wherein the stator comprises a core, the core comprises a yoke part and a plurality of tooth parts which are arranged at intervals in the circumferential direction on the yoke part; a winding, the winding comprises a plurality of coil assemblies and a bridge line circuit board, each tooth part is sleeved with a coil assembly, the bridge line circuit board has a plurality of positioning holes which are arranged at intervals in the circumferential direction, each tooth part is inserted into a positioning hole, so that the coil assembly can be compressed between the bridge line circuit board and the yoke part under the action of the self weight of the core, and the coil assembly is welded on the bridge line circuit board, without additional design of a positioning tool, the assembly process is simplified and the cost is reduced, not only the axial dimension of the stator is reduced, but also the air gap size is ensured, the product quality is greatly improved, and the production efficiency and product qualification rate are improved.

Description

Technical Field

[0001] This invention relates to the field of axial magnetic field motors, and more particularly to an axial magnetic field motor and its stator. Background Technology

[0002] An electric motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. Its main function is to generate driving torque, serving as a power source for electrical appliances or various machines. Industrial motors can be divided into radial magnetic field motors and axial magnetic field motors. Axial magnetic field motors, also known as disc motors, are characterized by their small size, light weight, short axial dimension, and high power density, making them suitable for most thin-film installation applications and thus widely used.

[0003] An electric motor consists of a stator and a rotor. The stator is the stationary part of the motor and is mainly composed of an iron core and windings wound on the iron core. The function of the stator is to generate a rotating magnetic field so that the rotor is cut by magnetic lines of force in the magnetic field and generates current.

[0004] In a three-phase winding structure, each phase winding consists of multiple coils, and these coils within the same phase are connected using bridging wires. Because flexible bridging wires can easily interfere with the winding process from the winding to the core, they are gradually being replaced by rigid bridging wire integrated circuit boards. For example, the invention patent with patent number CN202110908938.3 integrates the bridging wires within an insulating structure to form a ring-shaped bridging wire integrated circuit board, which is then fixed by welding to the winding. This solves the problems of inconsistent shape caused by the flexible bridging wires in existing technologies, as well as the time-consuming, costly, and inconsistent results caused by manual winding.

[0005] When assembling the ring-shaped bridge circuit board, positioning fixtures are required to ensure that the circuit board remains on the periphery of the stator and that the solder pads on the circuit board align with the lead-out ends of the coils fitted onto the stator teeth. The two are then soldered together to complete the assembly. However, this soldering process makes it difficult to control the soldering quality, easily leading to changes in the coil position after soldering. This severely impacts the air gap and electrical performance of the axial magnetic field motor, necessitating additional methods to control soldering and coil assembly quality, resulting in low production efficiency and poor work quality. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides an axial magnetic field motor and its stator, which achieves the goal of controlling welding accuracy and coil axial position precision, thereby ensuring air gap size, greatly improving finished product quality, increasing production efficiency, and increasing product qualification rate.

[0007] According to one aspect of the present invention, the present invention provides a stator for an axial magnetic field motor, comprising:

[0008] An iron core, the iron core including a yoke and a plurality of teeth spaced circumferentially on the yoke;

[0009] The winding includes multiple coil assemblies and a bridge wire circuit board. Each tooth is fitted with a coil assembly. The bridge wire circuit board has several circumferentially spaced positioning holes. Each tooth is inserted into a corresponding positioning hole so that the coil assembly can be pressed between the bridge wire circuit board and the yoke under the weight of the iron core. The coil assembly is soldered to the bridge wire circuit board.

[0010] In a preferred embodiment, the bridge circuit board includes an inner ring, an outer ring, and a plurality of pressure plates connecting the inner ring and the outer ring. A positioning hole is formed between two adjacent pressure plates. The inner ring is located inside the iron core, and the outer ring is located outside the iron core. A pressure plate is inserted between two adjacent teeth so that the coil assembly is pressed between the pressure plate and the yoke.

[0011] In a preferred embodiment, each coil assembly has two coil leads, and the inner ring or the outer ring provides coil pads for soldering the coil leads.

[0012] In a preferred embodiment, the outer ring includes a bridging wire assembly, an insulating structure, and a plurality of coil pads. The bridging wire assembly is encapsulated inside the insulating structure, and the plurality of coil pads are electrically connected to the bridging wire assembly and exposed on the side of the insulating structure facing the yoke.

[0013] In a preferred embodiment, the insulating structure containing the outer ring is provided with positioning pin holes and / or circuit board through holes for connecting the housing.

[0014] According to another aspect of the present invention, the present invention also provides an axial magnetic field motor, including the stator of the above embodiment, the axial magnetic field motor further comprising:

[0015] The housing includes a base plate and an outer side plate extending along the outer edge of the base plate. The iron core is located in the area enclosed by the outer side plate, and the yoke of the iron core is fixed to the base plate. The bridge circuit board is fixed to the housing by pressing the coil assembly.

[0016] In a preferred embodiment, the end of the outer side plate facing away from the bottom plate is the housing mounting surface, and the bridge circuit board is fixed to the housing mounting surface.

[0017] In a preferred embodiment, a fastener is also included, which connects the housing and the bridge circuit board to make the bridge circuit board fit tightly against the mounting surface of the housing.

[0018] In a preferred embodiment, a plurality of housing heat dissipation ribs are provided on the outer periphery of the outer side plate, and circuit board heat dissipation ribs corresponding one-to-one with the housing heat dissipation ribs are provided on the outer periphery of the bridge line circuit board.

[0019] In a preferred embodiment, the bridge circuit board is provided with a motor output head pad, and the outer side plate has an opening corresponding to the motor output head pad.

[0020] Compared with existing technologies, this technical solution has the following advantages:

[0021] The bridge wire circuit board provides the same number of positioning holes for the teeth of the iron core, so that each tooth can be inserted into the corresponding positioning hole. This allows the coil assembly wound around the teeth to be pressed between the bridge wire circuit board and the yoke under the weight of the iron core, eliminating the need for additional positioning fixtures, simplifying the assembly process and reducing costs. It not only reduces the axial dimension of the stator but also ensures the air gap size, greatly improving finished product quality, production efficiency, and product qualification rate. Furthermore, the structure of the bridge wire circuit board provides better accuracy for welding control and ensures the axial position accuracy of the coil assembly, further enhancing motor performance. When the stator and housing form a single stator assembly, the iron core is fixed to the base plate by the yoke, and the bridge wire circuit board is fixed to the outer side plate, further pressing the coil assembly. This ensures the air gap and axial dimensions of the stator after assembly with the housing, reducing the material usage in the axial direction of the housing and thus lowering costs.

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the stator structure of the axial magnetic field motor described in this invention;

[0024] Figure 2 This is a schematic diagram of the axial magnetic field motor described in this invention;

[0025] Figure 3 This is an exploded view of the axial magnetic field motor described in this invention;

[0026] Figure 4 This is a front view of the axial magnetic field motor described in this invention;

[0027] Figure 5 for Figure 4Sectional view along the AA direction.

[0028] In the diagram: 100 Stator, 110 Core, 111 Yoke, 112 Tooth, 120 Winding, 1201 Coil Pad, 1202 Motor Outlet Pad, 1203 Circuit Board Through Hole, 1204 Insulation Structure, 1205 Circuit Board Heat Dissipation Rib, 121 Coil Assembly, 1210 Coil Outlet, 1211 Coil, 1212 Frame, 122 Bridge Wire Circuit Board, 1220 Positioning Hole, 1221 Inner Ring, 1222 Outer Ring, 1223 Pressure Plate, 200 Housing, 210 Base Plate, 220 Outer Plate, 221 Housing Mounting Surface, 222 Opening, 223 Housing Heat Dissipation Rib, 224 Housing Mounting Hole, 230 Inner Plate. Detailed Implementation

[0029] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0030] like Figure 1 and Figure 2 As shown, the stator 100 of the axial magnetic field motor includes:

[0031] The iron core 110 includes a yoke 111 and a plurality of teeth 112 spaced circumferentially on the yoke 111.

[0032] The winding 120 includes a plurality of coil assemblies 121 and a bridging circuit board 122. Each tooth 112 is sleeved on a coil assembly 121. The bridging circuit board 122 has a plurality of circumferentially spaced positioning holes 1220. Each tooth 112 is inserted into a corresponding positioning hole 1220 so that the coil assembly 121 can be pressed between the bridging circuit board 122 and the yoke 111 under the weight of the iron core 110. The coil assembly 121 is soldered to the bridging circuit board 122.

[0033] The bridge circuit board 122 provides the same number of positioning holes 1220 for the teeth 112 of the iron core 110, so that each tooth 112 can be inserted into the corresponding positioning hole 1220. This allows the coil assembly 121 wound around the teeth 112 to be pressed between the bridge circuit board 122 and the yoke 111 under the weight of the iron core 110. No additional positioning fixtures are required, simplifying the assembly process. This not only reduces the axial dimension of the stator 100 but also ensures the air gap dimension, greatly improving the quality of the finished product and increasing production efficiency and product qualification rate.

[0034] like Figure 1 and Figure 2 As shown, the bridge circuit board 122 includes an inner ring 1221, an outer ring 1222, and a plurality of pressure plates 1223 connecting the inner ring 1221 and the outer ring 1222. A positioning hole 1220 is formed between two adjacent pressure plates 1223. The inner ring 1221 is located inside the iron core 110, and the outer ring 1222 is located outside the iron core 110. A pressure plate 1223 is placed between two adjacent teeth 112 so that the coil assembly 121 is pressed between the pressure plate 1223 and the yoke 111.

[0035] The positioning hole 1220 and the tooth 112 have the same shape, both being trapezoidal. The bottom of the trapezoidal tooth 112 is positioned externally relative to the top of the trapezoidal tooth 112, and the bottom of the trapezoidal tooth 112 is convex, while the top of the trapezoidal tooth 112 is concave. When the end of the tooth 112 away from the yoke 111 is inserted into the positioning hole 1220, the inner ring 1221 is located inside the iron core 110 and presses against the portions of all the coil assemblies 121 located inside the iron core 110. Similarly, the outer ring 1222 is located outside the iron core 110 and presses against the portions of all the coil assemblies 121 located outside the iron core 110. The pressure plate 1223 located between two adjacent teeth 112 also presses against two adjacent coil assemblies 121 and is located between two adjacent teeth 112, thereby ensuring the quality of the air gap surface after welding and the performance of the motor.

[0036] like Figure 1 As shown, the coil assembly 121 includes a frame 1212 and a coil 1211. The coil 1211 is wound around the frame 1212. The coil 1211 has two coil lead-out ends 1210, and the two coil lead-out ends 1210 are fixed at the edge of the contact end face between the frame 1212 and the bridge circuit board 122 for soldering to the bridge circuit board 122.

[0037] like Figure 1 and Figure 3 As shown, the outer ring 1222 provides a coil pad 1201 for soldering the coil lead-out end 1210. At this time, the two coil leads-out ends 1210 of the coil assembly 121 are respectively arranged facing the outer ring 1222 so as to solder the coil lead-out ends 1210 to the coil pad 1201 on the outer ring 1222.

[0038] Specifically, the outer ring 1222 includes a bridging wire assembly, an insulating structure 1204, and multiple coil pads 1201. The bridging wire assembly is encapsulated inside the insulating structure 1204. The multiple coil pads 1201 are electrically connected to the bridging wire assembly and are exposed on the side of the insulating structure 1204 facing the yoke 111. Thus, when the bridging wire circuit board 122 presses against the coil assembly 121, the side containing the coil pads 1201 is in close contact with the location of the two coil lead-out ends 1210, facilitating the soldering of the coil pads 1201 onto the coil lead-out ends 1201 with the shortest possible distance. This not only shortens the size of the coil lead-out ends 1210 and reduces the axial dimension of the stator 100, but also ensures the quality of the air gap surface after soldering.

[0039] More specifically, multiple coil pads 1201 are arranged circumferentially on the outer ring 1222. When each of the teeth 112 is fitted with a coil assembly 121, and the bridging circuit board 122 is used in conjunction with the iron core 110, the two coil leads 1210 of each coil assembly 121 can correspond to the coil pads 1201 on the outer ring 1222, thereby achieving the purpose of controlling the accuracy of the welding position, improving production efficiency, and increasing the product qualification rate.

[0040] The bridging wire assembly consists of three corresponding three-layer bridging wires. Each phase bridging wire is ring-shaped, and the three phase bridging wires are concentrically stacked at intervals. The coil pads 1201 are connected to the bridging wires via copper pillars. For details, please refer to patent CN202110908938.3. (Reference) Figure 3 Multiple coil pads 1201 are exposed on the same side of the bridge circuit board 122 facing the yoke 111, and are circumferentially spaced on the outer ring 1222 to correspond one-to-one with the coil lead-out heads 1210.

[0041] In addition, the coil pads 1201 can be arranged on the inner ring 1221, and the inner ring is composed of the bridge wire assembly, the insulation structure 1204 and a plurality of coil pads 1201. In this case, the outer ring 1222 can be composed only of the insulation structure.

[0042] Both the frame 1212 and the insulation structure are made of insulating material to prevent short circuits from affecting the motor's operating performance.

[0043] The assembly method of the stator 100 is as follows:

[0044] The first step is to attach a coil assembly 121 to each of the teeth 112 of the iron core 110.

[0045] The second step is to insert each of the teeth 112 into the corresponding positioning holes 1220 of the bridge circuit board 122, and then invert the whole thing. Then, the coil output head 1210 of the coil assembly 121 is soldered to the coil pad 1201 of the bridge circuit board 122.

[0046] In the second step, the coil assembly 121, which is wound around the toothed portion 112, can be pressed between the bridge wire circuit board 122 and the yoke portion 111 under the weight of the iron core 110, ensuring the accuracy of the axial position of the coil assembly 121, thereby ensuring the quality of the air gap surface after welding, and without the need for additional positioning fixtures, which simplifies the assembly process.

[0047] In summary, the bridge circuit board 122 provides the same number of positioning holes 1220 for the teeth 112 of the iron core 110, so that each tooth 112 can be inserted into the corresponding positioning hole 1220. This allows the coil assembly 121, wound around the teeth 112, to be pressed between the bridge circuit board 122 and the yoke 111 under the weight of the iron core 110. No additional positioning fixtures are needed, simplifying the assembly process and reducing costs. This not only reduces the axial dimension of the stator 100 but also ensures the air gap size, significantly improving finished product quality, production efficiency, and product qualification rate. Furthermore, the structure of the bridge circuit board 122 provides better accuracy for welding control and ensures the axial position accuracy of the coil assembly 121, further improving motor operating performance.

[0048] like Figures 2 to 5 As shown, an axial magnetic field motor includes the stator 100 of the above embodiment, and the axial magnetic field motor further includes:

[0049] The housing 200 includes a base plate 210 and an outer side plate 220 extending along the outer edge of the base plate 210. The iron core 110 is located in the area enclosed by the outer side plate 220, and the yoke 111 of the iron core 110 is fixed to the base plate 210. The bridge circuit board 122 is fixed to the housing 200 by pressing the coil assembly 121.

[0050] Since the axial magnetic field motor uses the stator 100 of the above embodiment, the beneficial effects brought by the motor stator 100 are as described in the above embodiment. Furthermore, the yoke 111 of the iron core 110 is fixed to the base plate 210, and the bridge circuit board 122 is fixed to the housing 200, so that the coil assembly 121 is further compressed, thereby ensuring the air gap size of the stator 100 after assembly in the housing 200.

[0051] like Figure 2 As shown, the base plate 210 is annular, and the inner edge of the base plate 210 extends to form an inner side plate 230, so that the annular iron core 110 is installed between the inner side plate 230 and the outer side plate 220.

[0052] like Figure 2 and Figure 5 As shown, the end of the outer side plate 220 facing away from the bottom plate 210 is the housing mounting surface 221, and the bridge line circuit board 122 is fixed on the housing mounting surface 221 so that the iron core 110 is located between the bridge line circuit board 122 and the bottom plate 210.

[0053] Specifically, the outer ring 1222 of the bridge circuit board 122 is fixed to the housing mounting surface 221, while the inner ring 1221 can be abutted and fixed to the inner side plate 230, so that the iron core 110 is located in a closed cavity, and only the end of the iron core 110 away from the yoke 111 is exposed by the positioning hole 1220 and can cooperate with the rotor.

[0054] like Figure 1 As shown, the insulating structure 1204 containing the outer ring 1222 has a locating pin hole and / or a circuit board through hole 1203 for connecting the housing 200. Thus, components passing through the locating pin hole and the circuit board through hole 1203 can avoid the bridge wire assembly, preventing a short circuit due to their connection.

[0055] Specifically, the axial magnetic field motor further includes fasteners that connect the housing 200 and the bridge circuit board 122, so that the bridge circuit board 122 is tightly attached to the housing mounting surface 221. The housing mounting surface 221 has several housing mounting holes 224 corresponding to the circuit board through holes 1203, and these holes are connected by fasteners, such as screws.

[0056] In addition to connecting the outer ring 1222 and the outer side plate 220, the fastener can also connect the inner ring 1221 and the inner side plate 230, further improving the connection strength between the bridge circuit board 122 and the housing 200, and increasing the clamping force of the bridge circuit board 122 on the coil assembly 121, ensuring the advantage of the small axial dimension of the axial magnetic field motor, and ensuring the air gap size.

[0057] like Figure 1 and Figure 2 As shown, the bridge circuit board 122 is provided with a motor output head pad 1202, and the outer plate 220 is provided with an opening 222 corresponding to the motor output head pad 1202. The motor output head can be soldered to the motor output head pad 1202 and led out through the opening 222.

[0058] like Figure 2 As shown, a plurality of housing heat dissipation fins 223 are provided on the outer periphery of the outer side plate 220, and circuit board heat dissipation fins 1205 corresponding to the housing heat dissipation fins 223 are provided on the outer periphery of the bridge circuit board 122, so that the channel between two adjacent housing heat dissipation fins 223 can be connected to the channel between two adjacent circuit board heat dissipation fins 1205, so that the introduced air can pass through the two correspondingly connected channels, thereby improving the heat dissipation performance.

[0059] The housing 200 can be upside down onto the bridge circuit board 122 so that the iron core 110 is housed inside the housing 200. It is then positioned by the positioning pin holes on the bridge circuit board 122, and the bridge circuit board 122 and the housing 200 are connected by fasteners. The yoke 111 of the iron core 110 is locked onto the bottom plate 210 of the housing 200 by bolts to complete the assembly.

[0060] In summary, the iron core 110 is abutted and fixed on the base plate 210 by the yoke 111, and the bridge circuit board 122 is fixed on the outer side plate 220, so that the coil assembly 121 is further compressed, thereby ensuring the air gap size and axial size of the stator 100 after it is assembled on the housing 200, reducing the amount of material used in the axial design of the housing, and thus reducing the cost.

[0061] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The scope of patent application of the present invention should not be limited by these embodiments. That is, any equivalent changes or modifications made in accordance with the spirit disclosed in the present invention still fall within the patent scope of the present invention.

Claims

1. A stator (100) of an axial magnetic field motor, characterized in that, include: The iron core (110) includes a yoke (111) and a plurality of teeth (112) spaced circumferentially on the yoke (111). The winding (120) includes a plurality of coil assemblies (121) and a bridge wire circuit board (122). Each tooth (112) is sleeved on a coil assembly (121). The bridge wire circuit board (122) has a plurality of circumferentially spaced positioning holes (1220). Each tooth (112) is inserted into a corresponding positioning hole (1220) so that the coil assembly (121) can be pressed between the bridge wire circuit board (122) and the yoke (111) under the weight of the iron core (110). The coil assembly (121) is welded to the bridge wire circuit board (122). The coil assembly (121) includes a frame (1212) and a coil (1211). The frame (1212) is sleeved on the toothed part (112). The coil (1211) is wound around the frame (1212) circumferentially. One side of the frame (1212) abuts against the yoke (111) in the axial direction, and the other side of the frame (1212) abuts against the bridge wire circuit board (122). The coil (1211) has two coil lead-out heads (1210). The two coil lead-out heads (1210) are fixed on the frame (1212) and soldered to the bridge wire circuit board (122). The bridge circuit board (122) includes an inner ring (1221), an outer ring (1222), and a plurality of pressure plates (1223) connecting the inner ring (1221) and the outer ring (1222). A positioning hole (1220) is formed between two adjacent pressure plates (1223). The inner ring (1221) is located inside the iron core (110), and the outer ring (1222) is located outside the iron core (110). A pressure plate (1223) is placed between two adjacent teeth (112) so that the coil assembly (121) is pressed between the pressure plate (1223) and the yoke (111).

2. The stator (100) of the axial magnetic field motor as described in claim 1, characterized in that, Each of the coil assemblies (121) has two coil leads (1210), and the inner ring (1221) or the outer ring (1222) provides coil pads (1201) for soldering the coil leads (1210).

3. The stator (100) of the axial magnetic field motor as described in claim 1, characterized in that, The outer ring (1222) includes a bridging wire assembly, an insulating structure (1204), and a plurality of coil pads (1201). The bridging wire assembly is encapsulated inside the insulating structure (1204). The plurality of coil pads (1201) are electrically connected to the bridging wire assembly and are exposed on the side of the insulating structure (1204) facing the yoke (111).

4. The stator (100) of the axial magnetic field motor as described in claim 3, characterized in that, The outer ring (1222) is provided with a positioning pin hole and / or a circuit board through hole (1203) on the insulating structure (1204) for connecting the housing (200).

5. An axial magnetic field motor, characterized in that, Including the stator (100) as described in any one of claims 1 to 4, the axial magnetic field motor further includes: The housing (200) includes a base plate (210) and an outer side plate (220) extending along the outer edge of the base plate (210). The iron core (110) is located in the area enclosed by the outer side plate (220), and the yoke (111) of the iron core (110) is fixed to the base plate (210). The bridge circuit board (122) is fixed to the housing (200) by pressing the coil assembly (121).

6. The axial magnetic field motor as described in claim 5, characterized in that, The outer side plate (220) is located away from the bottom plate (210) at one end, which is the housing mounting surface (221). The bridge circuit board (122) is fixed on the housing mounting surface (221).

7. The axial magnetic field motor as described in claim 6, characterized in that, It also includes fasteners that connect the housing (200) and the bridge circuit board (122) so that the bridge circuit board (122) is in close contact with the housing mounting surface (221).

8. The axial magnetic field motor as described in claim 6, characterized in that, The outer periphery of the outer plate (220) is provided with a plurality of housing heat dissipation ribs (223), and the outer periphery of the bridge line circuit board (122) is provided with circuit board heat dissipation ribs (1205) that correspond one-to-one with the housing heat dissipation ribs (223).

9. The axial magnetic field motor as described in claim 6, characterized in that, The bridge circuit board (122) is provided with a motor output head pad (1202), and the outer plate (220) is provided with an opening (222) corresponding to the motor output head pad (1202).

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