Motor circuit board and frameless motor

Abstract

The utility model provides an electric machine circuit board and frameless motor relates to electric machine's technical field, electric machine circuit board includes: insulating plate, circuit layer is located on the insulating plate, a plurality of pads are located on the surface of the insulating plate, the pad with circuit layer electric connection, the pad is used for with the terminal of stator winding welding fixed, at least part pad is equipped with a plurality of hole structure.When the terminal of stator winding is welded on the pad, the molten welding material will flow into the hole structure, and the surface of the pad and the hole structure both have welding material after condensation, and the welding material is fixed in the hole structure, so that the welding material is less likely to fall off, which is conducive to improving the reliability of the welding between the terminal of the winding and the pad on the circuit board, and optimizing the working stability of the motor.

Description

Technical Field

[0001] This application relates to the technical field of electric motors, specifically to an electric motor circuit board and a frameless motor. Background Technology

[0002] Frameless motors are a special type of direct-drive motor that lacks shafts, bearings, housings, or end caps. They offer advantages such as small size, high torque, and high efficiency, leading to their increasingly widespread application in robotics, medical, and automation fields. A frameless motor consists of a stator and a circuit board. The circuit board allows for wiring between the windings in the stator, simplifying motor manufacturing. However, the reliability of soldering between the winding terminals and the pads on the circuit board is currently poor, affecting the motor's operational stability. Utility Model Content

[0003] This application provides a motor circuit board and a frameless motor, which can solve the problem of poor reliability of soldering between the lead-out terminals of the winding and the solder pads on the circuit board.

[0004] According to one aspect of this application, one embodiment provides a motor circuit board, comprising:

[0005] Insulating board;

[0006] The circuit layer is disposed on the insulating board;

[0007] Multiple pads are provided on the surface of the insulating plate. The pads are electrically connected to the circuit layer and are used for welding and fixing to the outgoing terminals of the stator winding. At least some of the pads are provided with multiple hole structures.

[0008] In one embodiment, the outer periphery of the insulating plate is provided with a plurality of notches, each notch corresponding to a solder pad, and the notches are used to insert the outgoing terminals.

[0009] In one embodiment, the width of the notch gradually decreases from the outer periphery of the insulating plate to the center of the insulating plate.

[0010] In one embodiment, the closed end of the notch is located in the pad, and the maximum width of the closed end is greater than the diameter of the outgoing terminal.

[0011] In one embodiment, the two opposing inner wall surfaces on the V-shaped notch are inclined planes, and the included angle between the two inclined planes is greater than or equal to 2π / number of poles and less than or equal to 2π / number of slots; wherein, the number of poles is the number of magnetic poles on the rotor, and the number of slots is the number of slots in the stator.

[0012] In one embodiment, the insulating plate includes at least two insulating layers, and the perforation structure penetrates each of the insulating layers.

[0013] In one embodiment, the number of the hole structures is greater than or equal to three times the number of the insulating layers.

[0014] In one embodiment, the insulating plate is annular, and the pads are evenly distributed circumferentially on one surface of the insulating plate, and the number of pads is a multiple of 6.

[0015] In one embodiment, the surface of the insulating plate is further provided with an external welding part, which is electrically connected to the circuit layer, and the external welding part is provided with a plurality of hole structures.

[0016] According to another aspect of this application, one embodiment provides a frameless motor, including a stator, a rotor, and a motor circuit board as described above. The rotor is located inside the stator, and the circuit board is disposed at one end of the stator. The stator includes a stator core and a stator winding wound on the stator core. The stator winding is provided with a plurality of outgoing terminals. The outgoing terminals are fixed to the corresponding solder pads by soldering material, and a portion of the soldering material is located in the hole structure.

[0017] According to the motor circuit board and frameless motor of the above embodiments, the pads on the surface of the insulating board are provided with multiple hole structures. When the stator winding output terminals are soldered on the pads, the molten solder flows into the hole structure. After solidification, the surface of the pad and the hole structure are both covered with solder. The solder is fixed in the hole structure, making it less likely to fall off. This is beneficial to improving the reliability of the soldering between the winding output terminals and the pads on the circuit board and optimizing the working stability of the motor. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a motor circuit board according to one embodiment;

[0019] Figure 2 As one embodiment Figure 1 Enlarged view of A;

[0020] Figure 3 This is a schematic diagram of a stator winding using a three-winding process according to one embodiment.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1-Insulating board; 2-Solder pad; 3-Notch; 301-Closed end; 4-Hole structure; 5-External welding part; 6-Outgoing terminal. Detailed Implementation

[0023] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0024] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0025] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0026] In related technologies, frameless motors include a stator and a circuit board. The circuit board allows for wiring between the windings in the stator, simplifying motor manufacturing. However, the reliability of soldering between the winding terminals and the pads on the circuit board is poor, with instances of winding terminals becoming loose or even detaching from the pads, affecting the motor's operational stability.

[0027] In the motor circuit board provided in this application, the pads on the surface of the insulating board are provided with multiple hole structures. When the stator winding output terminals are soldered on the pads, the molten solder flows into the hole structure. After solidification, the surface of the pads and the hole structure are covered with solder. The solder is fixed in the hole structure, making it less likely to fall off. This helps to improve the reliability of the soldering between the winding output terminals and the pads on the circuit board and optimizes the working stability of the motor.

[0028] The following describes some embodiments of the motor circuit board provided in this application with reference to the accompanying drawings.

[0029] Please see Figures 1 to 3This application provides a motor circuit board, including an insulating board 1, a circuit layer, multiple solder pads 2, and other functional components as needed, which are described in detail below.

[0030] In this embodiment, the circuit layer is disposed on the insulating plate 1; multiple pads 2 are disposed on the surface of the insulating plate 1, the pads 2 are electrically connected to the circuit layer, and the pads 2 are used to weld and fix to the stator winding output terminal 6. At least some of the pads 2 are provided with multiple hole structures 4.

[0031] It is understood that the insulating plate 1 in this embodiment is made of insulating material, and the circuit layer in this embodiment is made of conductive material. This embodiment does not limit the specific manufacturing method of the insulating plate 1 and the circuit layer; the insulating plate 1 can be formed, and the circuit layer can be set on the insulating plate 1. The circuit layer in this embodiment can be located inside the insulating plate 1, or some circuitry can be exposed from the surface of the insulating plate 1. The solder pads 2 in this embodiment are provided on the surface of the insulating plate 1, either on one side of the insulating plate 1 or on both opposite surfaces of the insulating plate 1. In this embodiment, the stator winding includes multiple windings, and the terminals of the windings of each winding extend from the end of the stator to form output terminals 6. After soldering the output terminals 6 to the solder pads 2, electrical connection between the windings can be achieved. This embodiment does not limit the connection method between the windings; for example, it can be a star connection or a delta connection. Different connection methods can be configured with corresponding circuit structures for the circuit layer. In this embodiment, some solder pads 2 may have hole structures 4, or all solder pads 2 may have hole structures 4. In this embodiment, the hole structure 4 can be formed on the pad 2 during the fabrication of the pad 2, or the pad 2 can be fabricated first, and then the hole structure 4 can be machined on the pad 2. This embodiment does not limit the specific shape of the hole structure 4; for example, it can be a circular hole, and in some applications, it can also be an elliptical or square hole. This embodiment does not limit the specific size of the diameter or width of the hole structure 4; it is sufficient to allow the solder to flow in and to provide enough soldering surface on the surface of the pad 2.

[0032] In the motor circuit board of this embodiment, the pads 2 on the surface of the insulating plate 1 are provided with multiple hole structures 4. When the stator winding output terminals 6 are soldered on the pads 2, the molten solder flows into the hole structures 4. After solidification, the surface of the pads 2 and the hole structures 4 are covered with solder. The solder is fixed in the hole structures 4, making it less likely to fall off. This is beneficial to improving the reliability of the soldering between the winding output terminals 6 and the pads 2 on the circuit board, and optimizing the working stability of the motor.

[0033] In one embodiment, such as Figure 1 , Figure 2As shown, the outer periphery of the insulating plate 1 has multiple notches 3, each corresponding to a solder pad 2. The notches 3 are used to insert the outgoing terminals 6. The notches 3 enable automated processing of the connection between the circuit board and the stator winding. During manufacturing, automated equipment first clamps each outgoing terminal 6 of the stator winding and fixes the circuit board to one side of the stator winding outgoing terminals. Then, the automated equipment moves the circuit board, and during this movement, the clamped outgoing terminals 6 pass through the notches 3. Finally, the outgoing terminals 6 inserted in the notches 3 are soldered to the corresponding solder pads 2. The notches 3 prevent interference between the clamping part of the equipment and the circuit board when the clamped outgoing terminals 6 pass through the notches 3 during the movement process, providing favorable conditions for automated processing. In this embodiment, the notch 3 is the recessed portion on the outer periphery of the insulating plate 1 that faces towards the center of the circuit board. In some embodiments, the notch 3 may not be provided on the outer periphery of the insulating plate 1, and the outgoing terminal 6 may be bent and extended directly from the outer periphery of the circuit board to the pad 2. Alternatively, in some applications, the pad 2 may be located on the side of the circuit board near the stator. In this case, the outgoing terminal 6 does not need to pass through the circuit board and can be directly soldered and fixed to the pad 2.

[0034] In one embodiment, the width of the notch 3 gradually decreases from the outer periphery of the insulating plate 1 to its center. This notch 3 serves to automatically guide and clamp the output terminal 6. The notch 3 is wider on the outside and narrower on the inside; for example, the two opposing inner wall surfaces of the notch 3 can be beveled, making the notch 3 a V-shaped notch. The two beveled surfaces guide the output terminal 6 towards the solder pad 2 and also clamp the output terminal 6 inserted into the notch 3, preventing movement and providing favorable conditions for soldering. In some embodiments, the output terminal 6 may be inserted into the wider portion outside the notch 3. After insertion, the clamping part of the automated equipment moves the output terminal 6 towards the center of the circuit board, clamping it in the narrower portion inside the notch 3. In some embodiments, the notch 3 can also be of other shapes, as long as it effectively clamps the output terminal 6. When the outgoing terminal 6 is fixed by other structures or components, or when the outgoing terminal 6 does not need to be fixed, the notch 3 may not be made into a notch 3 with a clamping function. For example, it may be a U-shaped notch 3 or a rectangular notch 3.

[0035] In one embodiment, the closed end 301 of the notch 3 is located in the pad 2, and the maximum width of the closed end 301 is greater than the diameter of the output terminal 6. The closed end 301 is the end of the notch 3 away from the outer periphery of the insulating plate 1. In this embodiment, the closed end 301 is the area of ​​the notch 3 located in the pad 2, and the area outside the pad 2 is the open end of the notch 3. The width of the notch 3 gradually decreases from the outside to the inside. Therefore, the maximum width of the closed end 301 is the width of the part corresponding to the edge of the pad 2. The maximum width of the closed end 301 is greater than the diameter of the output terminal 6, so the output terminal 6 can be directly inserted into the pad 2 after being clamped, without the need to bend the output terminal 6, which helps to reduce processing steps and simplify processing. When the lead-out terminal 6 is inserted into the pad 2 and soldered with solder, some of the molten solder can also enter through the gap between the inner side of the closed end 301 and the lead-out terminal 6. This not only increases the effectiveness of the electrical connection between the lead-out terminal 6 and the pad 2, but also makes the solder less likely to fall off. In some embodiments, the maximum width of the closed end 301 may be less than or equal to the diameter of the lead-out terminal 6. During processing, the lead-out terminal 6 extending through the notch 3 can be bent and extended onto the pad 2 before soldering. In some embodiments, the pad 2 may also be located on one side of the notch 3, with a certain distance between the pad 2 and the notch 3. In this case, the lead-out terminal 6 extending through the notch 3 can be bent and extended onto the pad 2 before soldering.

[0036] In one embodiment, such as Figure 2 As shown, the two opposing inner wall surfaces on notch 3 are inclined planes. The included angle α between the two inclined planes is greater than or equal to 2π / number of poles and less than or equal to 2π / number of slots. Here, the number of poles is the number of magnetic poles on the rotor, and the number of slots is the number of slots on the stator. Different numbers of poles and slots correspond to different thicknesses of winding wire. The included angle α between the two inclined planes is determined based on the values ​​of the number of poles and slots. This allows the output terminals 6 of different thicknesses to have a corresponding range of included angle α to clamp them, ensuring that the included angle α between the two inclined planes is greater than or equal to 2π / number of poles and less than or equal to 2π / number of slots. Notch 3 within this included angle range allows the output terminals 6 to be clamped inside notch 3, closer to the solder pad 2 for easier soldering. For example, the number of poles can be 14, and the number of slots can be 18. In this case, the included angle α between the two inclined planes is greater than or equal to π / 7 and less than or equal to π / 9. During manufacturing, the included angle α can be an integer within this range, or a decimal value can be selected as needed. In some implementations, the included angle α between the two inclined planes may also need to be selected as a value within other ranges.

[0037] In one embodiment, the insulating board 1 includes at least two insulating layers, and the hole structure 4 penetrates each insulating layer. When the insulating board 1 has a multi-layer structure, the hole structure 4 penetrates each insulating layer of the insulating board 1. After the solder melts and flows into the hole structure 4, it can cover the spaces between the insulating layers. After the solder solidifies, it can form a fixation between the insulating layers, improving the strength of the circuit board. In some embodiments, for example, when the connection between the insulating layers is already sufficiently stable, the hole structure 4 can only penetrate the pad 2, or it can not penetrate the pad 2, forming a groove structure on the pad 2. In this case, solder can still flow in, which helps to prevent the solder from falling off.

[0038] In one embodiment, the number of hole structures 4 is greater than or equal to three times the number of insulating layers. The more insulating layers there are, the more hole structures 4 can be formed. For example, when the number of insulating layers is 2, 6 hole structures 4 can be provided on the pad 2; when the number of insulating layers is 3, 9 hole structures 4 can be provided on the pad 2; and when the number of insulating layers is 4, 12 hole structures 4 can be provided on the pad 2. In some embodiments, the number of hole structures 4 on the pad 2 can range from 6 to 21, and the number of hole structures 4 on each pad 2 can be the same. In some embodiments, the number of hole structures 4 on each pad 2 is not limited to a specific range and can be freely selected as needed; the number of hole structures 4 on each pad 2 can also be different.

[0039] In one embodiment, such as Figure 1 , Figure 3 As shown, the insulating plate 1 is annular, and the solder pads 2 are evenly distributed circumferentially on one surface of the insulating plate 1. The number of solder pads 2 is a multiple of 6. The insulating plate 1 is annular and has an inner hole, which corresponds to the inner hole of the stator, facilitating the assembly of the rotor inside the stator. In this embodiment, the stator windings can be set in a three-winding configuration, that is, the windings of each winding pass through three stator slots on the stator. In this case, the number of stator slots can be set to a multiple of 9, such as... Figure 3 As shown, two terminal blocks 6 extend from every three stator slots, thus two solder pads 2 can be correspondingly set for every three stator slots, for example... Figure 1 When the number of stator slots is 18, the corresponding number of pads 2 can be set to 12. In some embodiments, when the winding adopts other winding methods, the number of pads 2 is not limited to a multiple of 6, and the pads 2 can be set according to the position of the winding output terminal 6.

[0040] In one embodiment, such as Figure 1As shown, the surface of the insulating plate 1 is also provided with an external welding part 5, which is electrically connected to the circuit layer. The external welding part 5 has multiple hole structures 4. The external welding part 5 can be connected to a power source through wires, serving as the power input for the motor. The external welding part 5 has multiple hole structures 4. When welding the power supply wires to the external welding part 5, the molten solder flows into the hole structures 4. After solidification, the surface of the solder pad 2 and the hole structures 4 are covered with solder. The solder is fixed in the hole structures 4, making it less likely to fall off, which helps improve the reliability of the welding between the external welding part 5 and the power supply wires and optimizes the working stability of the motor. In some embodiments, when the motor is a three-phase motor, three external welding parts 5 can be provided, corresponding to the U-phase, V-phase, and W-phase respectively. The external welding parts 5 of the corresponding phase can be arranged adjacent to the solder pads 2 of the corresponding phase to facilitate the circuit arrangement of the circuit layer. For example, when the number of stator slots is 18 and the stator windings are arranged in a three-way winding manner, such as... Figure 1 As shown, an external soldering part 5 can be provided on one side of the pad 4 corresponding to slots 1, 4, and 7, respectively. The external soldering part 5 is arranged adjacent to the corresponding pad 4, and an electrical isolation material can also be provided between the external soldering part 5 and the pad 4. In some embodiments, the external soldering part 5 can also be provided at any other position on the surface of the insulating board 1 other than the pad 2, as needed.

[0041] In the motor circuit board provided in the above embodiment, the pads 2 on the surface of the insulating board 1 are provided with multiple hole structures 4. When the stator winding output terminals 6 are soldered on the pads 2, the molten solder flows into the hole structures 4. After solidification, the surface of the pads 2 and the hole structures 4 are both covered with solder. The solder is fixed in the hole structures 4, making it less likely to fall off. This is beneficial to improving the reliability of the soldering between the winding output terminals 6 and the pads 2 on the circuit board, and optimizing the working stability of the motor.

[0042] Please see Figures 1 to 3 This application embodiment also provides a frameless motor, including a stator, a rotor, and a motor circuit board as described above. The rotor is located inside the stator, and the circuit board is located at one end of the stator. The stator includes a stator core and a stator winding wound on the stator core. The stator winding is provided with a plurality of outgoing terminals 6. The outgoing terminals 6 are fixed to the corresponding solder pads 2 by soldering material, and part of the soldering material is located in the hole structure 4.

[0043] It is understood that the structure of the motor circuit board in this embodiment can be the same as that in the above embodiments, and will not be described again here. The stator winding in this embodiment can be a three-winding configuration, or other winding methods can be used. In this embodiment, the stator winding includes multiple windings, and the terminals of each winding extend from the end of the stator to form output terminals 6. After soldering the output terminals 6 to the pads 2, electrical connection between the windings can be achieved. In some application scenarios, ordinary motors with housings can also use the motor circuit board provided in the above embodiments.

[0044] In the frameless motor provided in the above embodiment, the pads 2 on the surface of the insulating plate 1 are provided with multiple hole structures 4. When the stator winding output terminals 6 are welded on the pads 2, the molten solder flows into the hole structures 4. After condensation, the surface of the pads 2 and the hole structures 4 are both covered with solder. The solder is fixed in the hole structures 4, making it less likely to fall off. This is beneficial to improving the reliability of the welding between the winding output terminals 6 and the pads 2 on the circuit board, and optimizing the working stability of the motor.

[0045] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the ideas presented.

Claims

1. A motor circuit board, characterized in that, include: Insulating board; The circuit layer is disposed on the insulating board; Multiple pads are provided on the surface of the insulating plate. The pads are electrically connected to the circuit layer and are used for welding and fixing to the outgoing terminals of the stator winding. At least some of the pads are provided with multiple hole structures.

2. The motor circuit board as described in claim 1, characterized in that, The outer periphery of the insulating plate is provided with multiple notches, each notch corresponding to a solder pad, and the notches are used to insert the outgoing terminals.

3. The motor circuit board as described in claim 2, characterized in that, The width of the notch gradually decreases from the outer periphery of the insulating plate to the center of the insulating plate.

4. The motor circuit board as described in claim 2, characterized in that, The closed end of the notch is located in the pad, and the maximum width of the closed end is greater than the diameter of the outgoing terminal.

5. The motor circuit board as described in claim 3, characterized in that, The two opposing inner wall surfaces on the notch are inclined planes, and the included angle between the two inclined planes is greater than or equal to 2π / number of poles and less than or equal to 2π / number of slots; wherein, the number of poles is the number of magnetic poles on the rotor, and the number of slots is the number of slots in the stator.

6. The motor circuit board as described in any one of claims 1-5, characterized in that, The insulating plate comprises at least two insulating layers, and the hole structure penetrates each of the insulating layers.

7. The motor circuit board as described in claim 6, characterized in that, The number of the pore structures is greater than or equal to three times the number of the insulating layers.

8. The motor circuit board as described in any one of claims 1-5, characterized in that, The insulating plate is circular in shape, and the pads are evenly distributed circumferentially on one surface of the insulating plate. The number of pads is a multiple of 6.

9. The motor circuit board as described in any one of claims 1-5, characterized in that, The surface of the insulating board is also provided with an external welding part, which is electrically connected to the circuit layer, and the external welding part is provided with multiple hole structures.

10. A frameless motor, characterized in that, The device includes a stator, a rotor, and a motor circuit board as described in any one of claims 1-9, wherein the rotor is located inside the stator, the circuit board is disposed at one end of the stator, the stator includes a stator core and a stator winding wound on the stator core, the stator winding having a plurality of outgoing terminals; the outgoing terminals are fixed to the corresponding solder pads by soldering material, a portion of the soldering material being located in the hole structure.

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