Positioning device and motor controller

Abstract

The utility model discloses a positioning device and a motor controller, the positioning device comprises a base plate, a positioning pin and a guide shaft, the base plate is provided with an upper surface and a lower surface opposite to the upper surface, and is provided with an avoiding opening penetrating through the upper surface and the lower surface; the positioning pin extends downwards from the lower surface to be inserted into the positioning hole, and when the positioning pin is inserted into the positioning hole, the pin header is exposed out of the avoiding opening; the guide shafts extend upwards from the upper surface to be used for penetrating through the guide holes, when the guide shafts penetrate through the guide holes, the pin seats and the row pins are aligned, and when the second circuit board moves towards the substrate in the axial direction of the guide shafts, the row pins are connected with the pin seats in an inserted mode. According to the utility model, through the positioning pin and the guide shaft of the positioning device, in the connection process of the two circuit boards which are electrically connected in a pin header and pin seat mode, the pin headers and the pin seats on the two circuit boards are accurately aligned and inserted, so that the pin headers are prevented from being deformed due to the influence of stress, and the pin headers and the pin seats between the circuit boards are more convenient to connect and assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of positioning devices, in particular to a positioning device and a motor controller. Background Art

[0002] At present, more and more electrical equipment adopts the connection of pin headers and needle holders to replace wires as the electrical connection method. Compared with the electrical connection method of wires, the electrical connection method of pin headers and needle holders has great advantages in space utilization and cost, and the assembly time is greatly shortened, eliminating the steps of tying wires. At present, when many equipment are assembled using the connection method of pin headers and needle holders, sometimes a needle holder needs to be plugged into multiple pin headers at the same time, and sometimes multiple needle holders are plugged into multiple pin headers. During assembly, it is difficult to judge whether the needle holder is accurately aligned with the pin header. It is often blindly plugged, that is, the needle holder and the pin header can only be plugged by feeling. If the needle holder and the pin header are forcibly plugged when they are not accurately aligned, it will bring stress to the pin header. Under long-term inaccurate plugging, the pin header and the needle holder will be deformed or even damaged due to stress, affecting the normal use of the equipment. Utility Model Content

[0003] The embodiment of the utility model provides a positioning device to solve the problem of difficulty in connecting and assembling a pin header and a pin seat between circuit boards.

[0004] In a first aspect, an embodiment of the utility model provides a positioning device for assisting in positioning and plugging a first circuit board provided with a pin header and a positioning hole and a second circuit board provided with a pin holder and a guide hole, the positioning device comprising:

[0005] A substrate, the substrate having an upper surface and a lower surface opposite to the upper surface, and the substrate is provided with an escape opening penetrating the upper surface and the lower surface;

[0006] A positioning pin extending downward from the lower surface to be inserted into the positioning hole, and when the positioning pin is inserted into the positioning hole, the pin row is exposed at the avoidance opening;

[0007] A guide shaft extends upward from the upper surface to penetrate the guide hole, and when the guide shaft is inserted into the guide hole, the needle seat and the row of needles are aligned, and when the second circuit board moves toward the substrate along the axial direction of the guide shaft, the row of needles is plugged into the needle seat.

[0008] In the positioning device provided in the embodiment of the utility model, a limiting portion is convexly provided on the upper surface of the substrate, and the guide shaft is fixed to the limiting portion. When the guide shaft is inserted into the guide hole, the edge of the guide hole stops at the limiting portion.

[0009] In the positioning device provided in the embodiment of the utility model, a plurality of positioning pins are provided, and the plurality of positioning pins are arranged on the edges around the avoidance opening.

[0010] In the positioning device provided in the embodiment of the utility model, the number of the guide shafts is two, and the two guide shafts are spaced apart and arranged at two opposite side edges of the avoidance opening.

[0011] In the positioning device provided in the embodiment of the utility model, the end of the positioning pin is in a conical transition.

[0012] In the positioning device provided in the embodiment of the utility model, the end of the guide shaft has a conical transition.

[0013] In the positioning device provided in the embodiment of the utility model, the substrate is further provided with a connection hole penetrating the upper surface and the lower surface, and the connection hole is used to connect with an external chassis to fix the substrate.

[0014] In the positioning device provided in the embodiment of the utility model, the substrate, the positioning pin and the guide shaft are all made of plastic materials.

[0015] In a second aspect, an embodiment of the utility model further provides a motor controller, which includes a chassis and a positioning device, wherein the positioning device is any one of the positioning devices provided in the embodiment of the utility model.

[0016] The utility model provides a positioning device and a motor controller, wherein the positioning device is used to assist in positioning and plugging a first circuit board provided with a pin row and a positioning hole and a second circuit board provided with a needle seat and a guide hole, wherein the positioning device comprises a substrate, a positioning pin and a guide shaft, wherein the substrate comprises an upper surface and a lower surface opposite to the upper surface, and a position avoidance opening penetrating the upper surface and the lower surface is provided on the substrate; the positioning pin extends downward from the lower surface for plugging into the positioning hole, and when the positioning pin is plugged into the positioning hole, the pin row is exposed from the position avoidance opening; the guide shaft extends upward from the upper surface for inserting into the guide hole, and when the guide shaft is inserted into the guide hole, the needle seat and the pin row are aligned, and when the second circuit board moves toward the substrate along the axial direction of the guide shaft, the pin row is plugged into the needle seat. It can be seen that the utility model uses the positioning pins and guide shafts of the positioning device to enable the pins and needle holders on the two circuit boards to be accurately aligned and plugged in during the connection process of two circuit boards that are electrically connected by means of pin headers and needle holders, thereby effectively preventing the pins from being deformed by stress, and making the connection and assembly of the pin headers and needle holders between the circuit boards more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A three-dimensional diagram of a positioning device provided in an embodiment of the utility model;

[0019] Figure 2 An axonometric diagram of a positioning device provided in an embodiment of the utility model;

[0020] Figure 3 An application scenario diagram of the positioning device provided by an embodiment of the utility model;

[0021] Figure 4 for Figure 3 A magnified view of part A;

[0022] Figure 5 A front view of a positioning device provided by an embodiment of the utility model;

[0023] Figure 6 A bottom view of a positioning device provided in an embodiment of the utility model;

[0024] Figure 7 A cross-sectional view of a motor controller provided by an embodiment of the utility model;

[0025] The reference numerals in the figures are:

[0026] 100, positioning device; 10, substrate; 101, avoidance opening; 102, limiting portion; 103, connecting hole; 11, positioning pin; 12, guide shaft; 200, motor controller; 20, chassis; 201, first chassis; 202, second chassis; 21, first circuit board; 211, pin header; 22, second circuit board; 221, needle holder. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only for reference to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and understand the present invention, but not to limit the present invention. In addition, in the drawings, structures with similar or identical structures are represented by the same reference numerals.

[0029] Reference Figures 1 to 6 , please refer to Figures 1 to 4 , which shows an embodiment of the positioning device 100 provided by the utility model. The structure and working principle of the positioning device 100 are described in detail below in conjunction with the drawings in the specification. The positioning device 100 is used to assist in positioning and plugging a first circuit board 21 provided with a pin header 211 and a positioning hole (not shown in the figure) and a second circuit board 22 provided with a needle seat 221 and a guide hole (not shown in the figure). The positioning device 100 includes a substrate 10, a positioning pin 11 and a guide shaft 12. The substrate 10 has an upper surface and a lower surface opposite to the upper surface. The substrate 10 is provided with a position avoidance opening 101 that passes through the upper surface and the lower surface; the positioning pin 11 extends downward from the lower surface to be plugged into the positioning hole, and when the positioning pin 11 is plugged into the positioning hole, the pin header 211 is exposed in the position avoidance opening 101; the guide shaft 12 extends upward from the upper surface to be inserted into the guide hole, and when the guide shaft 12 is inserted into the guide hole, the needle seat 221 is aligned with the pin header 211, and when the second circuit board 22 moves toward the substrate 10 along the axial direction of the guide shaft 12, the pin header 211 is plugged into the needle seat 221.

[0030] In a specific implementation, the positioning device 100 is mainly used to assist the insertion and positioning of the pin headers and the needle holders between multiple circuit boards. In actual application, the positioning device 100 is arranged between the first circuit board 21 and the second circuit board 22. The first circuit board 21 and the second circuit board 22 use the connection method of the pin header 211 and the needle holder 221 to connect the electrical signal, that is, the first circuit board 21 is provided with a pin header 211, and the second circuit board 22 is provided with a needle holder 221 adapted to the pin header 211. After alignment, the pin header 211 and the needle holder 221 can be plugged together to connect electrical performance. The number of first circuit boards 21 can be multiple, for example, two first circuit boards 21 are arranged adjacent to each other, and the pin headers 211 on the two are close to each other to form a combined pin header 211. The formed combined pin header 211 can be plugged into the same needle holder 221 on a second circuit board 22 to achieve electrical connection. A positioning hole is set on the first circuit board 21, and a guide hole is set on the second circuit board 22. The positioning hole is a through hole on the first circuit board 21, and the shape can be arbitrary, and it is usually set as a circular through hole, while the guide hole is a circular through hole on the second circuit board 22. The substrate 10 of the positioning device 100 is a flat plate. When the positioning device 100 is actually used, the substrate 10 is placed between the first circuit board 21 and the second circuit board 22. The first circuit board 21 and the second circuit board 22 need to be kept parallel when connected. In this embodiment, the upper surface of the substrate 10 is the side of the substrate 10 facing the second circuit board 21, and the lower surface of the substrate 10 is the side of the substrate 10 facing the second circuit board 22. A avoidance opening 101 is opened at the center of the substrate 10, which runs through the upper and lower surfaces of the substrate 10, and is mainly used for the insertion of the pins 211 on the first circuit board 21. The avoidance opening 101 has an arbitrary shape and size, and is usually designed to be rectangular, and the size is determined according to the number of the pins 211. The positioning pins 11 extend downward from the lower surface of the substrate 10 to a certain length. The positioning pins 11 are vertically fixed on the lower surface of the substrate 10. The number of the positioning pins 11 is arbitrary. Usually, a plurality of positioning pins 11 are arranged around the avoidance opening 101 on the substrate 10, and the number of positioning holes is determined by the number of positioning pins 11. When the positioning pins 11 are inserted into the positioning holes on the first circuit board 21, the pin headers 211 on the first circuit board 21 are aligned with the avoidance opening 101 and exposed in the avoidance opening 101 on the substrate 10. When actually designing the positioning holes on the first circuit board 21, the avoidance opening 101 and the pin headers 211 on the first circuit board 21 are first aligned as required, and then the positioning holes are opened according to the position of the end of the positioning pins 11 on the first circuit board 21. In this way, when the positioning pins 11 are inserted into the positioning holes on the first circuit board 21, the pin headers 211 on the first circuit board 21 are precisely aligned with the avoidance opening 101 on the substrate 10. The size of the positioning hole matches the size of the end of the positioning hole. After the positioning pin 11 is inserted into the positioning hole for a certain distance, the positioning pin 11 is clamped with the positioning hole so that the pin row 211 can pass through the avoidance opening 101 and be exposed to a certain length on the side of the substrate 10 facing the second circuit board 22.The guide shaft 12 extends upward from the upper surface of the substrate 10 to a certain length. The guide shaft 12 is vertically fixed on the upper surface of the substrate 10. There is no limit to the number of guide shafts 12. Multiple guide shafts 12 can be set around the avoidance opening 101 on the substrate 10, and the number of guide holes depends on the number of guide shafts 12. When the guide shaft 12 is inserted into the guide hole on the second circuit board 22, the needle seat 221 on the second circuit board 22 is aligned with the pin header 211 exposed in the avoidance opening 101. When the guide hole on the second circuit board 22 is actually designed, the needle seat 221 on the second circuit board 22 is first accurately aligned with the pin header 211 exposed in the avoidance opening 101 as required, and then the guide hole is opened according to the position of the end of the guide shaft 12 on the second circuit board 22. In this way, when the guide shaft 12 is inserted into the guide hole on the second circuit board 22, the needle seat 221 on the second circuit board 22 is accurately aligned with the pin header 211 exposed in the avoidance opening 101 on the substrate 10. The aperture size of the guide hole should be slightly larger than the diameter size of the guide shaft 12, so that the guide shaft 12 can be freely inserted into the guide hole. The second circuit board 22 is placed on the guide shaft 12 through the guide hole. Under the guiding action of the guide shaft 12, the second circuit board 22 can freely move along the axial direction of the guide shaft 12, and after moving a certain distance along the axial direction of the guide shaft 12 toward the substrate 10, since the needle seat 221 on the second circuit board 22 has been aligned with the pin header 211 exposed in the avoidance opening 101 on the substrate 10 after the guide shaft 12 is inserted into the guide hole, when the second circuit board 22 moves a certain distance along the axial direction of the guide shaft 12 toward the substrate 10, the needle seat 221 on the second circuit board 22 is plugged into the pin header 211 exposed in the avoidance opening 101, and as the second circuit board 22 continues to move until it is plugged into place, the first circuit board 21 and the second circuit board 22 are connected. During the whole process, it is only necessary to insert the locating pin 11 into the locating hole on the first circuit board 21, and then pass the guide hole on the second circuit board 22 onto the guide shaft 12 and move the second circuit board 22 toward the substrate 10 along the axial direction of the guide shaft 12, so that the pin header 211 on the first circuit board 21 and the needle seat 221 of the second circuit board 22 can be accurately plugged in. The assembly is very convenient, and because the pin header 211 and the needle seat 221 are precisely aligned and plugged together, the plugging of the pin header 211 and the needle seat 221 will not be affected by stress, and the electrical connection is more reliable.

[0031] In this embodiment, positioning pins are provided on the substrate to be plugged into the positioning holes on the first circuit board for positioning, so that after the positioning pins are plugged into the positioning holes, the pin headers on the first circuit board are exposed in the avoidance openings on the substrate, and a guide shaft is provided to be inserted and cooperated with the guide holes on the second circuit board for guidance, so that after the guide shaft is inserted into the guide hole, the needle seat on the second circuit board is accurately aligned with the pin header, and the second circuit board moves toward the substrate along the axial direction of the guide shaft under the guidance of the guide shaft, thereby realizing accurate alignment and plugging of the pin header and the needle seat, effectively avoiding deformation of the pin header due to stress, and making the connection and assembly of the pin header and the needle seat between the circuit boards more convenient and quick.

[0032] In one embodiment, referring to Figure 1 , Figure 4 and Figure 5 , the upper surface of the substrate 10 is provided with a stopper 102, the guide shaft 12 is fixed to the stopper 102, and when the guide shaft 12 is inserted into the guide hole, the edge of the guide hole stops at the stopper 102. In a specific implementation, the stopper 102 is a columnar structure protruding from the upper surface of the substrate 10, the bottom end of the guide shaft 12 is fixedly connected to the top end face of the stopper 102 of the columnar structure, and the diameter of the stopper 102 of the columnar structure is larger than the diameter of the guide shaft 12 and the aperture of the guide hole. When designing, the length of the stopper 102 protruding from the substrate 10 is determined according to the spacing between the guide hole and the substrate 10 when the needle seat 221 and the pin header 211 are fully plugged in, so that after the needle seat 221 and the pin header 211 are plugged in, the stopper 102 can just abut against the edge of the guide hole. After the guide shaft 12 passes through the positioning hole on the second circuit board 22, the needle seat 221 on the second circuit board 22 has been aligned with the pin header 211 exposed at the avoidance opening 101 on the substrate 10, and the second circuit board 22 is gradually moved toward the substrate 10 along the axial direction of the guide shaft 12. First, the needle seat 221 will be preliminarily plugged with the end of the pin header 211, and the second circuit board 22 will continue to be moved toward the substrate 10. When the edge of the guide hole contacts the limiting portion 102, the needle seat 221 and the pin header 211 exposed at the avoidance opening 101 are fully plugged into place. At this time, the edge of the guide hole is stopped by the limiting portion 102, so that the second circuit board 22 cannot continue to move toward the substrate 10, thereby preventing the needle seat 221 from being over-plugged with the pin header 211, causing the pins and the needle seat 221 to be deformed or damaged.

[0033] In one embodiment, the positioning pins 11 are provided in plurality, and the positioning pins 11 are arranged at the edges of the avoidance opening 101. In a specific implementation, the number of positioning pins 11 is set in plurality, and the positioning pins 11 are arranged on the side of the substrate 10 facing the first circuit board 21, and are respectively located at the edges of the avoidance opening 101. The number of positioning holes on the first circuit board 21 is the same as the number of positioning pins 11, and the specific positions are also set according to the positions of the positioning pins 11. After the plurality of positioning pins 11 are inserted into the plurality of positioning holes, the pin row 211 can be accurately positioned at the predetermined point in the avoidance opening 101, and the plurality of positioning pins 11 also support the substrate 10 to stabilize it. The specific number of positioning pins 11 can be set to four, and the four positioning pins 11 can be arranged at the edges of the avoidance opening 101. After the four positioning pins 11 are plugged into the four positioning holes on the first circuit board 21, the pin row 211 is accurately positioned at the predetermined point in the avoidance opening 101.

[0034] In one embodiment, the number of the guide shafts 12 is at least two, and at least two guide shafts 12 are spaced apart at the opposite side edges of the avoidance opening 101. In a specific implementation, since the matching accuracy of the guide hole and the guide shaft 12 is very high, setting one guide shaft 12 cannot achieve accurate positioning and guiding, and setting more than three guide shafts 12 will cause over-positioning. Considering the production tolerance, two guide shafts 12 are set on the side of the substrate 10 facing the second circuit board 22, and the two guide shafts 12 are spaced apart at the opposite side edges of the avoidance opening 101, and two guide holes are set on the second circuit board 22. The two guide shafts 12 cooperate with the two guide holes to achieve accurate positioning and guiding of the needle seat 221 and the pin header 211.

[0035] In one embodiment, referring to Figure 1 , the end of the guide shaft 12 is in a conical transition. In a specific implementation, the end of the positioning pin 11 is set to be in a conical transition, that is, the end of the positioning pin 11 is in a gradually narrowing conical shape. When plugging with the positioning hole on the first circuit board 21, the conical transition part of the end of the positioning pin 11 can provide a guiding effect, making it more convenient to plug the positioning pin 11 into the positioning hole.

[0036] In one embodiment, referring to Figure 1 , the end of the guide shaft 12 is in a conical transition. In a specific implementation, the end of the guide shaft 12 is set to be in a conical transition, that is, the end of the guide shaft 12 is in a gradually narrowing conical shape. When the guide shaft 12 is inserted into the guide hole on the second circuit board 22, the conical transition part of the end of the guide shaft 12 can provide a guiding effect, making it more convenient for the guide shaft 12 to be inserted into the guide hole.

[0037] In one embodiment, referring to Figure 1 , Figure 2 and Figure 6 , the substrate 10 is provided with a connection hole 103, and the connection hole 103 is used to connect with an external chassis to fix the substrate 10. In a specific implementation, the external chassis is usually provided with a connection structure for fixing the substrate 10, such as a connection portion provided with a screw hole, etc., and the connection hole 103 on the substrate 10 is a through hole provided on the substrate 10, and the connection hole 103 is provided near the edge of the substrate 10. The connection hole 103 on the substrate 10 can be connected to the connection structure of the external chassis by cooperating with a screw, thereby firmly fixing the substrate 10 and the external chassis, so that the needle seat 221 on the second circuit board 22 and the pin header 211 on the first circuit board 21 are more firmly plugged. The number of connection holes 103 can be set to multiple, and the more holes 103 are provided, the more stable the connection between the substrate 10 and the chassis 20 is.

[0038] In one embodiment, the substrate 10, the positioning pins 11 and the guide shaft 12 are all made of plastic material. In a specific implementation, the positioning device 100 is designed with plastic material as a whole, that is, the substrate 10, the positioning pins 11 and the guide shaft 12 are all made of plastic material, which can well insulate electrical performance and avoid unnecessary signal interference between the first circuit board 21 and the second circuit board 22.

[0039] In one embodiment, referring to Figure 7 , this embodiment provides a motor controller 200, which includes a chassis 20, a positioning device 100, and components such as a main control board and a driving board. The driving control of the motor can be achieved through the cooperation between the various components. The positioning device 100 is arranged in the chassis 20, and the main control board and the driving board are connected by plugging the pin header 211 and the needle seat 221. The positioning device 100 assists in the connection between the pin header 211 and the needle seat 221 between the main control board and the driving board in the chassis 20. Among them, the positioning device 100 in this embodiment can adopt any one of the positioning devices 100 provided by the utility model. Since the previous specification has made a detailed introduction to the specific structure and working principle of the positioning device 100, for the sake of brevity of the specification, it will not be repeated here.

[0040] Further, the chassis 20 includes a first chassis 201 and a second chassis 202 that are detachably connected, the first circuit board 21 and the positioning device 100 are both arranged in the first chassis 201 and the positioning pin 11 is inserted into the positioning hole, and the second circuit board 22 is arranged in the second chassis 202, wherein when the first chassis 201 is connected to the second chassis 202, the guide shaft 12 is passed through the guide hole of the second circuit board 22. In a specific implementation, the first chassis 201 and the second chassis 202 are two independently detachable chassis 20, which are arranged adjacent to each other, the first circuit board 21 and the positioning device 100 are both arranged in the first chassis 201, the first circuit board 21 is specifically a driving board of the motor controller 200, and the second circuit board 22 is arranged in the second chassis 202, and the second circuit board 22 is specifically a main control board of the motor controller 200. In the first chassis 201, the positioning pin 11 of the positioning device 100 is inserted into the positioning hole on the first circuit board 21, so that the pin header 211 on the first circuit board 21 is aligned with the avoidance opening 101 on the substrate 10 of the positioning device 100 and exposed in the avoidance opening 101, the connection hole 103 of the substrate 10 is fixed in the first chassis 201 by screws, the side where the first chassis 201 is connected to the second chassis 202 is open, and the pin header 211 and the guide shaft 12 are also exposed in the opening on the first chassis 201. In the second chassis 202, the second circuit board 22 is fixed in the second chassis 202 according to the predetermined position, and the needle seat 221 and the guide hole on the second circuit board 22 are exposed in the opening on the second chassis 202. During assembly, first align the guide hole of the opening of the second circuit board 22 exposed on the second chassis 202 with the guide shaft 12 of the opening exposed on the second chassis 202, then insert the guide shaft 12 into the guide hole, and move the second chassis 202 toward the first chassis 201 along the axial direction of the guide shaft 12 until the second chassis 202 and the first chassis 201 are connected in place. At this time, the needle seat 221 on the second circuit board 22 in the second chassis 202 and the pin header 211 on the first circuit board 21 in the first chassis 201 are accurately plugged in. Finally, the first chassis 201 and the second chassis 202 can be firmly connected by bolts. Overall, with the assistance of the positioning device 100, the main control board in the second chassis 202 and the drive board in the first chassis 201 are accurately plugged in through the connection method of the pin header 211 and the needle seat 221, and the assembly is very convenient and quick.

[0041] The motor controller in this embodiment adopts the positioning device provided by the utility model, so the connection and assembly of various circuit board components inside it becomes more convenient and faster, and the practicality is better.

[0042] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A positioning device for assisting the positioning and plugging of a first circuit board provided with a pin header and a positioning hole and a second circuit board provided with a pin holder and a guide hole, characterized in that: include: A substrate, the substrate having an upper surface and a lower surface opposite to the upper surface, and the substrate is provided with an escape opening penetrating the upper surface and the lower surface; A positioning pin extending downward from the lower surface to be inserted into the positioning hole, and when the positioning pin is inserted into the positioning hole, the pin row is exposed at the avoidance opening; A guide shaft extends upward from the upper surface to penetrate the guide hole, and when the guide shaft is inserted into the guide hole, the needle seat and the row of needles are aligned, and when the second circuit board moves toward the substrate along the axial direction of the guide shaft, the row of needles is plugged into the needle seat.

2. The positioning device according to claim 1, characterized in that: A limiting portion is convexly provided on the upper surface of the substrate, and the guide shaft is fixed to the limiting portion. When the guide shaft is inserted into the guide hole, the edge of the guide hole is stopped by the limiting portion.

3. The positioning device according to claim 1, characterized in that: There are multiple positioning pins, and the multiple positioning pins are arranged on the edges around the avoidance opening.

4. The positioning device according to claim 1, characterized in that: The number of the guide shafts is two, and the two guide shafts are spaced apart and arranged at two opposite side edges of the avoidance opening.

5. The positioning device according to claim 1, characterized in that: The end of the positioning pin is in a conical transition.

6. The positioning device according to claim 1, characterized in that: The end of the guide shaft is in a conical transition.

7. The positioning device according to claim 1, characterized in that: The base plate is also provided with a connection hole penetrating the upper surface and the lower surface, and the connection hole is used to connect with an external chassis to fix the base plate.

8. The positioning device according to any one of claims 1 to 7, characterized in that: The base plate, the positioning pin and the guide shaft are all made of plastic materials.

9. A motor controller, characterized in that: include: Chassis; A positioning device, disposed in the chassis; Wherein, the positioning device is the positioning device described in any one of claims 1-8.

10. The motor controller according to claim 9, characterized in that: The chassis includes a first chassis and a second chassis that are detachably connected, the first circuit board and the positioning device are both arranged in the first chassis and the positioning pin is inserted into the positioning hole, and the second circuit board is arranged in the second chassis, wherein when the first chassis is connected to the second chassis, the guide shaft is passed through the guide hole of the second circuit board.

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