Circuit board and servo motor

Abstract

The invention discloses a circuit board and a servo motor, and relates to the technical field of circuit boards, the servo motor comprises a stator assembly, a rotor assembly and an encoder rotor, the circuit board comprises a first area and a second area, the first area is provided with an encoder circuit, and the encoder circuit is used for being arranged opposite to the encoder rotor to serve as an encoder stator; the second area is provided with a stator winding wire and a plurality of stator winding connecting ends; wherein the plurality of stator winding connecting ends are electrically connected with the stator winding wiring; and the stator winding connecting end is used for being connected with a contact pin of a stator assembly. According to the servo motor, the servo motor inner stator winding wiring circuit board and the encoder circuit board are integrated, the encoder rotor is installed on the motor rotating shaft in an interference mode, or the encoder rotor and the motor rotating shaft are arranged in an adhesive mode, and the effects of reducing the size of the servo motor and reducing the assembling complexity and cost of the servo motor are achieved.

Description

Technical Field

[0001] This application relates to the field of circuit board technology, and in particular to a circuit board and a servo motor. Background Technology

[0002] Servo motors, as a key component of automation and precision control, play a central role in many fields. Currently, miniaturizing servo motors remains a primary research focus for those skilled in the art. Summary of the Invention

[0003] The main purpose of this application is to propose a circuit board and a servo motor, which integrates the servo motor stator winding wiring circuit board with the encoder circuit board, and interference-fits the encoder rotor onto the motor shaft, or glues the encoder rotor to the motor shaft, thereby reducing the size of the servo motor and lowering the assembly complexity and cost of the servo motor.

[0004] To achieve the above objectives, this application proposes a circuit board for a servo motor, the servo motor including a stator assembly, a rotor assembly, and an encoder rotor, comprising:

[0005] A first region is provided with an encoder circuit, which is configured to be positioned opposite to the encoder rotor as an encoder stator.

[0006] The second region is provided with stator winding wiring and multiple stator winding connection terminals;

[0007] The stator winding connection terminals are electrically connected to the stator winding wiring; the stator winding connection terminals are used to connect to the pins of the stator assembly.

[0008] Optionally, the circuit board is further provided with an encoder signal connection terminal and a power connection terminal;

[0009] The encoder signal connection terminal is electrically connected to the encoder circuit, and the encoder signal connection terminal is used to connect to external devices;

[0010] The power connection terminal is connected to the stator winding wiring, and the power connection terminal is used to connect to the supply voltage.

[0011] Optionally, an isolation area is further provided between the first area and the second area on the circuit board.

[0012] Optionally, the isolation area is provided with isolation slots, and the number of isolation slots is multiple, with any two adjacent isolation slots forming a connecting bridge.

[0013] Optionally, the isolation groove includes an arc-shaped isolation groove, and the number of the arc-shaped isolation grooves is multiple;

[0014] Among them, multiple arc-shaped isolation grooves are arranged on the same circumference; or,

[0015] At least one of the arc-shaped isolation grooves is disposed on a different circumference from any other arc-shaped isolation groove.

[0016] Optionally, at least one of the plurality of stator winding connection terminals is located at the edge of the circuit board, and the stator winding connection terminal located at the edge of the circuit board is a slot-shaped pad.

[0017] Optionally, the stator winding connection end includes a connection socket for connecting the pins of the stator assembly.

[0018] Optionally, the circuit board has a circular structure, with the second region surrounding the outside of the first region.

[0019] Optionally, the circuit board includes positioning holes and fixing holes, the positioning holes being used to position the circuit board, and the fixing holes being used to fix the circuit board to the motor.

[0020] This application discloses a servo motor, including: a stator assembly, a rotor assembly, an encoder rotor, and a circuit board as described in any one of the above;

[0021] The encoder rotor is connected to the rotor assembly, the circuit board is connected to the stator assembly, the encoder rotor and the rotor assembly are rotatable relative to the stator assembly and the circuit board, the encoder circuit on the circuit board is arranged opposite to the encoder rotor, and the pins of the stator assembly are connected to the stator winding connection terminal of the circuit board.

[0022] Optionally, the servo motor further includes a housing and a rear end cover. The stator assembly is disposed in the receiving cavity of the housing, and the circuit board is disposed in the receiving cavity of the rear end cover. The side wall of the rear end cover is provided with a cable outlet and a cable outlet terminal. The cable outlet terminal is connected to the encoder signal connection terminal and the power connection terminal on the circuit board.

[0023] Optionally, the rear end cover has a stop wall on the side facing the stator assembly, and the stop wall is provided with a plurality of clearance through holes, through which the pins of the stator assembly extend into the receiving cavity of the rear end cover.

[0024] This application discloses a circuit board for a servo motor, the servo motor including a stator assembly, a rotor assembly, and an encoder rotor. The circuit board includes a first region and a second region. The first region is provided with an encoder circuit, which is arranged opposite to the encoder rotor to serve as an encoder stator. The second region is provided with stator winding wiring and multiple stator winding connection terminals. The multiple stator winding connection terminals are electrically connected to the stator winding wiring. The stator winding connection terminals are used to connect to the pins of the stator assembly.

[0025] This configuration allows the stator winding wiring and encoder circuitry to be integrated onto the same circuit board in a practical servo motor. The encoder rotor can be interference-fitted onto the motor shaft, or it can be glued to the motor shaft. This reduces the number of circuit boards, shrinks the size of the servo motor, increases its integration, and lowers the manufacturing cost and assembly complexity of the servo motor. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a circuit board according to an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of an embodiment of the servo motor of this application;

[0029] Figure 3 This is a cross-sectional schematic diagram of another embodiment of the servo motor of this application;

[0030] Figure 4 This is a schematic diagram of the rear cover of another embodiment of the servo motor of this application.

[0031] Explanation of icon numbers:

[0032] 100. First area; 200. Second area; 1. Stator winding connection end; 2. Isolation slot; 3. Connecting bridge; 4. Encoder signal connection end; 5. Power connection end; 6. Positioning hole; 7. Fixing hole; 8. Encoder rotor; 9. Stator assembly; 10. Motor shaft; 11. Support step; 12. Clearance through hole; 13. Stator assembly pin; 14. Fixing screw; 15. Positioning pin; 16. Housing; 17. Rear end cover; 18. Cable outlet; 19. Stop wall.

[0033] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0035] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0036] Servo motors, as a key component of automation and precision control, play a central role in many fields. Currently, miniaturizing servo motors remains a primary research focus for those skilled in the art.

[0037] Therefore, this application proposes a circuit board, with reference to Figure 1 For use in a servo motor, the servo motor including a stator assembly, a rotor assembly and an encoder rotor, the circuit board including:

[0038] A first region 100 is provided with an encoder circuit, which is arranged opposite to the encoder rotor to serve as an encoder stator.

[0039] The second region 200 is provided with stator winding wiring and multiple stator winding connection terminals 1;

[0040] The stator winding connection terminals 1 are electrically connected to the stator winding wiring; the stator winding connection terminals 1 are used to connect to the pins 13 of the stator assembly.

[0041] In this embodiment, the circuit board can be implemented using a ceramic substrate, a glass fiber substrate, or the like.

[0042] In this embodiment, the first region 100 is provided with an encoder circuit (not shown in the figure). The encoder circuit may include circuit modules such as an encoder module for receiving the encoder output, processing it, and then outputting the signal. The encoder module receives the output from the encoder, processes it, and outputs it to an external terminal or the control circuit of a servo motor to determine the current position of the motor. For example, the encoder output is converted from analog to digital and then output to the control circuit of the servo motor so that the control circuit determines the current position of the motor based on the result.

[0043] Optionally, based on the above-described embodiment of the encoder circuit including an encoder module, in one embodiment, the encoder circuit further includes a power management circuit electrically connected to the encoder module. The power management circuit provides stable voltage and current to the encoder module, ensuring that the encoder module and other electronic components operate at appropriate voltages. For example, the power management circuit may include a voltage converter, such as a buck converter, to convert the input voltage to the operating voltage required by the encoder circuit. It may also include a filtering circuit to filter out noise and fluctuations in the input voltage, ensuring that the encoder circuit receives a stable voltage signal and mitigating signal interference caused by input voltage fluctuations.

[0044] The second area 200 is provided with stator winding wiring and multiple stator winding connection terminals 1. For example, the multiple stator winding connection terminals 1 can be implemented using solder holes. The multiple stator winding connection terminals 1 are electrically connected to the stator winding wiring, and the stator winding connection terminals 1 are used to connect to the pins 13 of the stator assembly. The stator winding wiring is a preset conductive path on the circuit board, used to connect to the stator winding connection terminals 1 and also to connect to an external power supply, so that the voltage output by the external power supply is output to the stator assembly 9 through the stator winding wiring and the multiple stator winding connection terminals 1, thereby realizing the function of the stator assembly 9 in the servo motor.

[0045] With the above setup, the stator winding wiring and encoder circuitry can be integrated onto the same circuit board. The encoder rotor can be interference-fitted onto the motor shaft, or it can be glued to the motor shaft. This reduces the number of circuit boards, shrinks the size of the servo motor, increases its integration, and lowers the manufacturing cost and assembly complexity of the servo motor.

[0046] It is important to understand that there is a difference in voltage requirements between the stator assembly 9 and the encoder circuit; the voltage of the stator assembly 9 is higher than the operating voltage of the encoder circuit. Therefore, it is necessary to address the issue of abnormal encoder circuit operation caused by the interference of the high-voltage signal in the second region 200 on the low-voltage signal in the first region 100.

[0047] In one embodiment of this application, an isolation area is further provided between the first region 100 and the second region 200.

[0048] Alternatively, in one embodiment, the isolation region may be an area without any devices or copper plating to achieve the separation between the two.

[0049] Optionally, in one embodiment, the entire isolation area may be covered with or partially covered with grounded copper to improve the heat dissipation performance of the circuit board, provide a ground plane, and shield electromagnetic interference (EMI). For example, grounded copper may be laid around the encoder circuit to reduce the influence of electrical signals in the second area 200 on the signals flowing through the encoder circuit in the first area 100.

[0050] Optionally, in one embodiment, an isolation groove 2 is provided within the isolation area, for example, a gap or groove is cut out on the mechanical layer of the circuit board, thereby improving the signal isolation between the first region 100 and the second region 200. Furthermore, a filler, such as insulating silicone grease, can be provided within the isolation groove 2, which not only improves the isolation but also enhances the heat dissipation performance of the circuit board.

[0051] Optionally, in one embodiment, some isolation components, such as grounded metal isolation components, may also be provided in the isolation area to improve the signal isolation between the first area 100 and the second area 200.

[0052] Furthermore, optionally, based on the above embodiment where isolation grooves 2 are provided within the isolation area, in one embodiment, the number of isolation grooves 2 is multiple, and a connecting bridge 3 is formed between any two adjacent isolation grooves 2. In this embodiment, due to the difference in the coefficient of thermal expansion (CTE) between the circuit board and the components on the board (connectors, chips, and other components), thermal stress will be generated. If thermal stress is concentrated at a point or in a region, it may cause solder joint cracks, delamination, or breakage, thereby affecting the connection and function of the circuit. Therefore, this embodiment uses multiple connecting bridges 3 to achieve local connection of any adjacent isolation grooves 2, which can distribute stress evenly, reduce the stress borne by a single connection point, and thus improve the overall thermal stability and durability. At the same time, it can also disperse the mechanical stress generated during the fixing or installation process, reducing the risk of circuit board deformation or damage due to local stress concentration.

[0053] In one embodiment, reference Figure 1 The isolation groove 2 includes an arc-shaped isolation groove 2.

[0054] The number of the arc-shaped isolation grooves 2 is multiple;

[0055] Among them, multiple arc-shaped isolation grooves 2 are arranged on the same circumference; or,

[0056] At least one of the arc-shaped isolation grooves 2 is disposed on a different circumference from any other arc-shaped isolation groove 2.

[0057] In this embodiment, to effectively isolate the first region 100 and the second region 200, and to optimize heat conduction and electromagnetic interference performance, this application provides multiple arc-shaped isolation grooves 2 on the circuit board, which are arranged radially. It should be noted that the layout of the arc-shaped isolation grooves 2 can take two forms: all arc-shaped isolation grooves 2 are arranged on the same circumference, forming a ring array; or, different arc-shaped isolation grooves 2 are arranged on different circumferences, forming a multi-layer ring array. In this embodiment, all arc-shaped isolation grooves 2 are arranged on the same circumference. Figure 1 As shown, four arc-shaped notches are provided on the same circumference of the circuit board, which can improve the problem of heat conduction and electromagnetic interference between the first region 100 and the second region 200.

[0058] In one embodiment of this application, reference is made to Figure 1 At least one of the plurality of stator winding connection terminals 1 is disposed at the edge of the circuit board.

[0059] Optionally, the multiple stator winding connection terminals 1 can be located either at the edge of the circuit board or in the middle of the circuit board. The middle location of the stator winding connection terminals 1 may be more advantageous for stator winding wiring layout, reducing wiring complexity. Stator winding connection terminals 1 located at the edge are closer to the motor housing, facilitating heat dissipation and improving heat dissipation efficiency. Furthermore, the solder holes at the edge are easier to solder during assembly and are farther from the encoder circuit within the first region 100 on the circuit board, further improving the isolation between the first region 100 and the second region 200.

[0060] Optionally, in one embodiment, the plurality of stator winding connection terminals 1 are all located along the edge of the circuit board. This not only improves integration but also enhances assembly convenience.

[0061] Optionally, in one embodiment, the stator winding connection end 1 located at the edge of the circuit board is a slotted pad. That is, slotted pads matching the pins of the stator assembly 9 are provided on the circumference (edge ​​position) of the circuit board. These slotted pads are distributed along the edge of the circuit board to facilitate direct soldering of the stator assembly pins 13 onto the circuit board. The slotted pads reduce the area occupied by the circuit board, leaving more space for other components and stator winding wiring on the circuit board, and reducing the complexity of the design.

[0062] It should be noted that during the manufacturing of servo motors, the stator winding needs to be wound multiple times at the bottom of the pins, and the pins are relatively long. This may lead to structural deformation and misalignment of the pins, resulting in misalignment when assembled with the stator winding wiring circuit board. Therefore, in this embodiment, the stator winding connection end 1 includes a connecting female, which is used to connect the pins 13 of the stator assembly. Using a connecting female (connector) instead of traditional solder holes (slot pads) can shorten the originally long stator assembly 9 pins, reducing deformation and misalignment caused by gravity during winding, thereby improving the accuracy and reliability of the stator assembly 9. The connecting female installed on the two-in-one circuit board proposed in this application matches the pins 13 of the stator assembly, reducing circuit failures caused by poor soldering or pin misalignment.

[0063] As can be seen from the above, using a connecting female socket instead of the traditional solder hole connection method can not only effectively avoid structural deformation and assembly misalignment caused by excessive length of the pin during the winding process, but also simplify the motor assembly process, improve production efficiency and product quality, and significantly enhance the stability and reliability of the servo motor.

[0064] In one embodiment, reference Figure 1 The circuit board is also provided with an encoder signal connection terminal 4 and a power connection terminal 5;

[0065] The encoder signal connection terminal 4 is electrically connected to the encoder circuit, and the encoder signal connection terminal 4 is used to connect to external devices;

[0066] The power connection terminal 5 is connected to the stator winding wiring, and the power connection terminal 5 is used to connect to the power supply voltage.

[0067] The circuit board is also provided with a wiring port, and multiple terminals in the wiring port are respectively electrically connected to the encoder signal connection terminal 4 and the power connection terminal 5.

[0068] In this embodiment, the encoder signal connection terminal 4 is connected to the encoder circuit and is responsible for receiving and sending encoder signals; while the power connection terminal 5 is connected to the stator assembly 9 and is used to receive the power supply voltage output by the external device to provide power to the motor.

[0069] Optionally, in one embodiment, to facilitate connection with external devices, a wiring port is also designed on the circuit board. The wiring port contains multiple terminals, each corresponding to the encoder signal connection terminal 4 and the power connection terminal 5. The wiring port can be a standard type; in a servo motor, an opening can be provided on the servo motor housing corresponding to the location of the wiring port, allowing the user to directly connect a single external device or multiple external devices through a single wiring port. This enables one or more external devices to interact with the encoder circuit via the same wiring port, and the output power supply voltage is routed to the stator assembly 9 via the stator winding. Thus, the user can easily connect external devices through the wiring port without additional wiring or concerns about incorrect connections. It is worth noting that the encoder signal connection terminal 4 and the power connection terminal 5 can be arranged near the motor output side and led out from the same output port 18. This not only simplifies the internal wiring of the motor but also reduces the number of wiring ports, making the entire motor structure more compact and easier to install and maintain.

[0070] Optionally, in another embodiment, the servo motor includes a connection port, wherein multiple terminals in the connection port are electrically connected to the encoder signal connection terminal 4 and the power connection terminal 5 respectively.

[0071] In this embodiment, optionally, the encoder signal connection terminal 4 and power connection terminal 5 on the circuit board can be directly soldered one-to-one with multiple different terminals in the connection port of the servo motor. Alternatively, the encoder signal connection terminal 4 and power connection terminal 5 can be first connected one-to-one with multiple terminals inside the circuit board wiring port, and then the multiple terminals of the wiring port on the circuit board and the terminals of the connection port on the housing can be connected through connectors at both ends of a ribbon cable, thus simplifying the installation complexity.

[0072] In one embodiment of this application, reference is made to Figure 1 The circuit board has a circular structure. In a servo motor, the pins on the stator assembly 9 are typically arranged radially along the stator assembly 9 and on the same circumference. Therefore, the circular circuit board has a high structural compatibility with the multiple stator assembly 9 pins, improving the accuracy and convenience of circuit board installation. With multiple stator winding connection ends 1 all arranged along the edge of the circuit board and evenly distributed on the circumference, it is easier to quickly align the stator winding connection ends 1 with the stator assembly 9 pins, facilitating installation.

[0073] In one embodiment of this application, the second region 200 is disposed around the outside of the first region 100. In this embodiment, reference... Figure 3The encoder rotor 8 is embedded in the motor shaft 10. As the motor shaft 10 rotates, the encoder circuit on the circuit board receives the output corresponding to the encoder rotor 8, which is then processed by the encoder module in the encoder circuit and output to an external terminal or the control circuit of the servo motor to determine the current position of the motor. The stator assembly 9 is arranged around the motor shaft 10. Since the motor shaft 10 is located at the center of the motor and the stator assembly 9 is located on the outside of the motor shaft 10, this application adopts a circular circuit board structure to adapt to the structure of the servo motor and reduce assembly complexity. At the same time, the first area 100 where the encoder circuit is located is used as the inner circle to facilitate the corresponding connection between the encoder circuit and the encoder rotor 8. The second area 200, which has stator winding wiring and stator winding connection end 1, is located on the outside of the first area 100 to facilitate the corresponding connection between the stator winding connection end 1 and the stator assembly 9. In this way, the assembly complexity is simplified.

[0074] To ensure the accurate installation and secure fixation of the integrated circuit board (stator winding wiring circuit board and encoder circuit board), in one embodiment, the circuit board includes a positioning hole 6 and a fixing hole 7. The positioning hole 6 is used to position the circuit board, and the fixing hole 7 is used to fix the circuit board to the motor.

[0075] like Figure 1 As shown, positioning holes 6 and fixing holes 7 are distributed along the edge of the circuit board, arranged radially. It should be noted that the diameter and position of these positioning holes 6 and fixing holes 7 need to be precisely calculated to align with the positioning pin holes 15 on the motor rear end cover 17. The use of positioning holes 6 ensures that the two-in-one circuit board can be quickly and accurately aligned during installation, thereby reducing the tedious complexity of manual adjustments and greatly improving assembly efficiency. Secondly, multiple fixing holes 7 arranged radially are used to securely connect the circuit board to the motor using screws. These fixing holes 7 are also located on the edge of the circuit board, adjacent to the positioning holes 6. The diameter of the fixing holes 7 is suitable for standard screws. Once the positioning holes 6 are aligned with the positioning pin holes 15 on the rear end cover 17, the two-in-one circuit board can be firmly fixed to the motor rear end cover 17 using screws through these fixing holes 7. The number and arrangement of the fixing holes 7 ensure uniform stress on the circuit board, reducing the risk of stress concentration and circuit board damage that may be caused by uneven installation.

[0076] By setting the positioning holes 6 and fixing holes 7 in the radial direction on the circuit board (two-in-one circuit board) of this application, not only is the precise positioning of the circuit board achieved, but also its stable connection with the motor is ensured, thereby improving assembly efficiency and ensuring the performance of the servo motor.

[0077] This application also proposes a servo motor, as shown in the reference. Figure 3It includes: encoder rotor 8, rotor assembly, stator assembly 9 and circuit board as described in any of the above;

[0078] The encoder rotor 8 is connected to the rotor assembly, and the circuit board is connected to the stator assembly 9. The encoder rotor 8 and the rotor assembly are rotatable relative to the stator assembly 9 and the circuit board. The encoder circuit on the circuit board is arranged opposite to the encoder rotor 8. The pin 13 of the stator assembly is connected to the stator winding connection terminal 1 of the circuit board.

[0079] The servo motor includes a motor shaft 10, and the encoder rotor 8 is embedded in the motor shaft 10.

[0080] Based on the above embodiments, the circuit board integrates the stator winding wiring circuit board and the encoder circuit, forming a two-in-one circuit board. The circuit board has stator winding connection terminals 1 corresponding to the pins 13 of the motor stator assembly, facilitating electrical connection with the pins 13 of the stator assembly. The stator winding connection terminals 1 can be implemented using solder holes or connecting female connectors. The motor shaft 10 is the core component of the motor, and the encoder rotor 8 is embedded within it, enabling precise control of the motor position. Specifically, the encoder rotor 8 is embedded in the motor shaft 10, and the encoder rotor 8 and encoder circuit connected to the rotor assembly are positioned relative to each other. As the encoder rotor 8 and the rotor assembly rotate relative to the stator assembly 9 and the encoder circuit, magnetic signals or other signals are generated, thereby calculating the position. The results are then fed back to an external terminal or the control circuit of the servo motor to determine the current position of the motor. The pins 13 of the stator assembly are connected to the stator winding connection terminals 1 on the circuit board. When these stator winding connection terminals 1 are located at the edge of the circuit board, soldering is convenient.

[0081] In this embodiment, the encoder rotor 8 is interference-fitted onto the motor shaft 10, or the encoder rotor 8 is bonded to the motor shaft 10.

[0082] It is understandable that interference fit (also known as tight fit or interference fit) is a common mechanical assembly technique, mainly used to ensure a tight connection between two parts in order to transmit torque or axial force. This assembly method is based on the principle of elastic deformation of materials and is mainly applied to the fit between holes and shafts. Interference fit assembly can be achieved through press-fitting and thermostatic methods. Press-fitting directly presses the shaft into the hole using mechanical force, while thermostatic methods utilize the principle of thermal expansion and contraction, temporarily reducing the interference by heating the hole or cooling the shaft, making the assembly process easier. Interference fit relies on the physical properties of the material rather than any external fasteners, thus providing a very reliable connection. Taking the thermostatic method as an example, the encoder rotor 8 is preheated using a heating device until it reaches a preset temperature. At this time, the diameter of the encoder rotor 8 is enlarged due to the principle of thermal expansion and contraction, facilitating installation. Once the preset temperature is reached, the heated encoder rotor 8 is quickly fitted onto the motor shaft 10, using the interference fit principle to ensure a tight fit on the shaft.

[0083] Optionally, a thin layer of structural adhesive can be applied to the contact surface between the encoder rotor 8 and the motor shaft 10. Ensure the adhesive is applied evenly, avoiding air bubbles and buildup, and allow it to cure. The curing time depends on the type of adhesive and the ambient temperature. This allows for the bonding of the encoder rotor 8 to the motor shaft 10. It should be noted that this embodiment can combine interference fit with structural adhesive. The structural adhesive can be applied to the contact surface between the encoder rotor 8 and the motor shaft 10 before cooling, ensuring the encoder rotor 8 is firmly fixed to the motor shaft 10 and guaranteeing good stability of the servo motor during operation. The combination of interference fit and structural adhesive provides double protection, maintaining the stable fixation of the encoder rotor 8 even under extreme operating conditions.

[0084] In one embodiment of this application, reference is made to Figure 2 The servo motor further includes a housing 16 and a rear end cover 17. The stator assembly 9 is disposed within the receiving cavity of the housing 16, and the circuit board is disposed within the receiving cavity of the rear end cover 17. The side wall of the rear end cover 17 is provided with a cable outlet 18 and cable outlet terminals. The cable outlet terminals are connected to the encoder signal connection terminal 4 and the power connection terminal 5 on the circuit board. In this embodiment, the servo motor includes a housing 16 and a rear end cover 17, which are arranged in an upper and lower corresponding structure. The rear end cover 17 is also provided with a cable outlet 18 and cable outlet terminals. Figure 2As shown, the upper part is the rear end cover 17, and the lower part is the housing 16. A cable outlet 18 is provided on the side wall of the rear end cover 17. In this embodiment, a hole can be opened in the wall of the rear end cover 17 for installing cable outlet terminals. The cable outlet 18 is a rectangular hole, through which the encoder signal connection terminal 4 and the power connection terminal 5 are directly led out via cables and connected to the cable outlet 18 and the cable outlet terminals. It should be noted that the shape of the cable outlet 18 can be set according to actual needs. The rear end cover 17 is designed with multiple support steps 11, which correspond to the positioning holes 6 and fixing holes 7 on the circuit board for precise alignment and fixing of the two-in-one circuit board. This ensures that the circuit board can be stably installed at the rear of the motor, i.e., the circuit board is placed close to the rear end cover 17 of the motor. Simultaneously, the support steps 11 are provided with positioning pin holes 15 and threaded holes for easy connection with positioning pins 15 and fixing screws 14 (e.g., ...). Figure 2 As shown, the two-in-one circuit board is securely positioned and fixed on the rear cover 17.

[0085] In one embodiment, reference Figure 4 The rear end cover 17 has a stop wall 19 on the side facing the stator assembly 9. The stop wall 19 has multiple clearance holes 12, the positions of which correspond to the pins 13 of the motor stator assembly. Thus, the pins 13 of the stator assembly extend into the receiving cavity of the rear end cover 17 through the clearance holes 12. During assembly, the pins 13 of the stator assembly pass through these clearance holes 12 and are then soldered to the stator winding connection end 1 on the circuit board to form an electrical connection. Simultaneously, the encoder rotor 8 is pre-embedded into the motor shaft 10 and fixed by a tight fit or structural adhesive. Compared to traditional radial set screw installation, this reduces the overall size of the motor and lowers design costs. In actual assembly, the encoder rotor 8 is first installed onto the motor shaft, and then the two-in-one circuit board is fixed to the rear end cover 17 using locating pins 15 and screws. Then, the stator assembly 9 pins are soldered to the stator winding connection end 1. Finally, the encoder cable and motor cable are led out from the outlet 18 to complete the assembly of the entire servo motor.

[0086] By fixing the encoder rotor 8 to the motor shaft using a tight fit or structural adhesive, compared to the traditional radial set screw method, the motor structure is simplified, helping to reduce the overall size of the motor and lower costs. The support step 11 on the rear cover 17 corresponds to the positioning holes 6 and fixing holes 7 on the circuit board, allowing for precise alignment and secure fixing of the two-in-one circuit board, simplifying the motor assembly process. Furthermore, the pins 13 and through holes 12 of the multiple stator components on the rear cover 17 correspond to the pins of the stator components 9, ensuring a stable and reliable electrical connection between the motor stator components 9 and the circuit board. Secondly, the fixing method of the two-in-one circuit board to the rear cover 17 and the installation method of the encoder rotor 8 facilitate disassembly and replacement, which is beneficial for motor maintenance and repair, reducing maintenance costs.

[0087] It is worth noting that since the servo motor of this application includes the aforementioned circuit board, the embodiments of the servo motor of this application include all the technical solutions of all the embodiments of the aforementioned circuit board, and the technical effects achieved are exactly the same, so they will not be repeated here.

[0088] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the content of the specification and drawings of this application under the concept of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A circuit board for a servo motor, the servo motor comprising a stator assembly, a rotor assembly, and an encoder rotor, characterized in that, The circuit board includes: A first region is provided with an encoder circuit, which is configured to be positioned opposite to the encoder rotor as an encoder stator. The second region is provided with stator winding wiring and multiple stator winding connection terminals; The stator winding connection terminals are electrically connected to the stator winding wiring; the stator winding connection terminals are used to connect to the pins of the stator assembly.

2. The circuit board as described in claim 1, characterized in that, The circuit board is also provided with an encoder signal connection terminal and a power connection terminal. The encoder signal connection terminal is electrically connected to the encoder circuit, and the encoder signal connection terminal is used to connect to external devices; The power connection terminal is connected to the stator winding wiring, and the power connection terminal is used to connect to the power supply voltage.

3. The circuit board as described in claim 1, characterized in that, An isolation area is also provided between the first area and the second area on the circuit board.

4. The circuit board as described in claim 3, characterized in that, The isolation area is provided with multiple isolation slots, and any two adjacent isolation slots form a connecting bridge.

5. The circuit board as described in claim 4, characterized in that, The isolation groove includes arc-shaped isolation grooves, and the number of arc-shaped isolation grooves is multiple; Among them, multiple arc-shaped isolation grooves are arranged on the same circumference; or, At least one of the arc-shaped isolation grooves is disposed on a different circumference from any other arc-shaped isolation groove.

6. The circuit board as described in claim 1, characterized in that, At least one of the plurality of stator winding connection terminals is located at the edge of the circuit board, and the stator winding connection terminal located at the edge of the circuit board is a slot-shaped pad.

7. The circuit board as described in claim 1, characterized in that, The stator winding connection end includes a connecting female, which is used to connect the pins of the stator assembly.

8. The circuit board as described in any one of claims 1-7, characterized in that, The circuit board has a circular structure, and the second region is arranged around the outside of the first region.

9. The circuit board as described in any one of claims 1-7, characterized in that, The circuit board includes positioning holes and fixing holes. The positioning holes are used to position the circuit board, and the fixing holes are used to fix the circuit board to the motor.

10. A servo motor, characterized in that, include: Stator assembly, rotor assembly, encoder rotor, and circuit board as described in any one of claims 1-9; The encoder rotor is connected to the rotor assembly, the circuit board is connected to the stator assembly, the encoder rotor and the rotor assembly are rotatable relative to the stator assembly and the circuit board, the encoder circuit on the circuit board is arranged opposite to the encoder rotor, and the pins of the stator assembly are connected to the stator winding connection terminal of the circuit board.

11. The servo motor as described in claim 10, characterized in that, The servo motor also includes a housing and a rear end cover. The stator assembly is located in the receiving cavity of the housing, and the circuit board is located in the receiving cavity of the rear end cover. The side wall of the rear end cover is provided with a cable outlet and a cable outlet terminal. The cable outlet terminal is connected to the encoder signal connection terminal and the power connection terminal on the circuit board.

12. The servo motor as described in claim 11, characterized in that, The rear end cover has a stop wall on the side facing the stator assembly, and the stop wall is provided with a plurality of clearance through holes, through which the pins of the stator assembly extend into the receiving cavity of the rear end cover.

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