An ultra-thin high-precision permanent magnet synchronous motor for a drone

Abstract

The utility model discloses a kind of ultra-thin high-precision permanent magnet synchronous motor for flying dart, flexible film circuit board includes upper annular circuit board, lower circular circuit board, outer connecting wire and inner connecting wire, upper annular circuit board is set between upper shell and stator assembly, stator assembly is electrically connected with upper annular circuit board, lower circular circuit board is set to the lower end surface of lower shell, the center part of lower shell is provided with the code embedded hole passing through lower shell, the upper end surface of lower circular circuit board is provided with encoder, and encoder is inserted into code embedded hole.Through flexible film circuit board replaces traditional relatively thicker PCB board and circular wire, and lower circular circuit board is set outside lower shell, to reduce axial installation space, reduce the thickness of permanent magnet synchronous motor, in the same size material station, more quantity of flying dart can be installed, and mounting efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to an ultra-thin, high-precision permanent magnet synchronous motor for feeders. Background Technology

[0002] Feeders, also known as material feeders or material feeders, are used in SMT (Surface Mount Technology) machines to precisely deliver electronic components to the machine. The feeder uses a motor to precisely feed and unfeed the tape containing the components, working in conjunction with the pick-and-place machine's nozzles to complete the component picking and feeding actions, ensuring that the components are accurately placed in the designated positions on the PCB.

[0003] As electronic components become smaller and PCB assembly densities increase, there are higher demands on the precision and speed of pick-and-place machines. Traditional feeders use stepper motors, which can only reliably supply 0402-sized components with a feeding speed of only 5 pieces per second, resulting in slow feeding. Furthermore, the torque of a stepper motor is directly proportional to its size; to achieve higher torque, the motor's size must increase. This increased motor size leads to a thicker feeder, reducing the number of feeders the pick-and-place machine's feed station can hold. Consequently, frequent feeder replacements are necessary to replenish components, resulting in low placement efficiency.

[0004] While existing feeders using brushless motors have solved the shortcomings of stepper motors, they typically have two PCBs inside the motor: one for connecting the coil and the other for mounting the encoder. Both PCBs occupy axial mounting space, increasing the motor's thickness. Furthermore, the two PCBs need to be led out by wires, which need to be soldered to the PCBs. These thick-diameter round wires also occupy considerable mounting space, increasing the overall size of the feeder. Therefore, improvements are necessary. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an ultra-thin, high-precision permanent magnet synchronous motor for feeders, which reduces the thickness and diameter to reduce the overall thickness of the feeder, increases the number of feeders installed in the chip mounter station, improves mounting efficiency, and at the same time increases the speed and torque to improve feeding accuracy and speed.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an ultra-thin, high-precision permanent magnet synchronous motor for feeders, comprising an upper shell and a lower shell, with a stator assembly disposed between the upper and lower shells, and a rotor assembly disposed within the inner ring of the stator assembly. The rotor assembly is rotatably connected to the upper shell. The motor includes a flexible thin-film circuit board, comprising an upper annular circuit board, a lower circular circuit board, external connecting wires, and internal connecting wires. The upper annular circuit board is disposed between the upper shell and the stator assembly, and the stator assembly is electrically connected to the upper annular circuit board. The lower circular circuit board is disposed on the lower end face of the lower shell. The center of the housing has an encoding hole that penetrates the lower housing. An encoder is installed on the upper surface of the lower circular circuit board. The encoder is inserted into the encoding hole. A magnet slot is provided at the lower part of the rotor assembly. An encoding magnet is embedded in the magnet slot and is located above the encoder. The inner connecting wire is attached to the outer wall of the stator assembly. The upper end of the inner connecting wire is connected to the upper annular circuit board, and the lower end of the inner connecting wire is connected to the lower circular circuit board. One end of the outer connecting wire is connected to the upper annular circuit board, the lower circular circuit board, or the inner connecting wire. The other end of the outer connecting wire is provided with a board-to-board connector.

[0007] In a further technical solution, a circular coding slot and a bar coding slot are provided on the lower end face of the lower shell, and a lower clearance notch is provided on the outer edge of the lower shell. The circular coding slot is located in the center of the lower shell, one end of the bar coding slot is connected to the circular coding slot, and the other end is connected to the lower clearance notch. A wire-passing slot is provided on the outer side of the stator assembly. The wire-passing slot is located above the lower clearance notch. The lower circular circuit board is embedded in the circular coding slot, and the inner connecting wire is embedded in the wire-passing slot. The lower end of the inner connecting wire passes through the lower clearance notch and the bar coding slot in sequence and connects to the lower circular circuit board. The outer connecting wire is connected to the upper annular circuit board.

[0008] In a further technical solution, the lower shell is also provided with a protective cover plate, which includes an integrally formed circular cover plate, a strip cover plate and an arc-shaped vertical plate. One end of the strip cover plate is formed on the outer edge of the circular cover plate, and the other end of the strip cover plate is integrally formed with the lower end of the arc-shaped vertical plate. The circular cover plate is embedded in the circular coding groove, the strip cover plate is embedded in the strip coding groove, and the arc-shaped vertical plate is embedded in the wire threading groove.

[0009] In a further technical solution, at least two upper positioning posts are provided on the lower end face of the upper shell or the upper end face of the stator assembly, at least two lower positioning posts are provided between the circular coding groove and the circular cover plate, the upper annular circuit board is provided with upper positioning holes corresponding to each upper positioning post, the lower circular circuit board is provided with lower positioning holes corresponding to each lower positioning post, each upper positioning post is inserted into each upper positioning hole, and each lower positioning post is inserted into each lower positioning hole.

[0010] In a further technical solution, the inner wall of the circular coding groove and / or the outer edge of the circular cover plate are provided with a plurality of first glue-filling holes at intervals along the circumferential direction; and at least one second glue-filling hole is provided on both sides of the strip coding groove and / or on both sides of the strip cover plate.

[0011] In a further technical solution, a filter embedding hole penetrating the lower end face of the lower shell is also provided. The filter embedding hole is located in the circular coding groove. A filter capacitor is also provided on the upper end face of the lower circular circuit board. The filter capacitor is inserted into the filter embedding hole.

[0012] In a further technical solution, the stator assembly includes a stator ring frame and multiple connecting pins. The inner ring of the stator ring frame is provided with multiple pole posts spaced apart along the circumferential direction. Each pole post is wound with a coil. Each connecting pin is inserted through the stator ring frame along the axial direction. The wire ends of each coil are connected to the lower ends of each connecting pin, and the upper ends of each connecting pin are connected to the upper ring circuit board.

[0013] In a further technical solution, the upper end of the connecting pin is bent at 90° to form a connecting part, and the lower end of the upper ring circuit board is provided with pads corresponding to the positions of each connecting part. Each connecting part is soldered to the corresponding pad by soldering.

[0014] In a further technical solution, the stator ring frame includes an upper coated sheet, a lower coated sheet, and a silicon steel frame. The silicon steel frame covers the space between the upper coated sheet and the lower coated sheet. The silicon steel frame includes multiple silicon steel sheets stacked along the axial direction. Each connecting pin is inserted through the upper coated sheet and the lower coated sheet. There are nine pole posts, with three adjacent pole posts forming a group. There are six connecting pins. Three connecting pins are connected to the wire ends of the coils on the three groups of pole posts, and the other three connecting pins are connected to the wire ends of the coils on the three groups of pole posts.

[0015] The rotor assembly includes a power magnetic ring, a coupling, an output shaft, a bushing, an output gear, a rotor yoke, an encoding magnet, and at least one bearing. The power magnetic ring is sleeved on the outside of the rotor yoke. The lower part of the coupling is riveted to the lower part of the rotor yoke and is located inside the rotor yoke. A magnet slot is provided on the lower end face of the coupling. The encoding magnet is embedded in the magnet slot and is glued and fixed to the coupling. The lower end of the output shaft is fixedly connected to the upper part of the coupling. The bearing is sleeved on the output shaft. The bushing is sleeved on the bearing and fixedly connected to the upper shell. The output gear is fixedly installed on the upper end of the output shaft and is located above the upper shell. The power magnetic ring has five pairs of magnetic poles in the radial direction, and the encoding magnet has one pair of magnetic poles in the radial direction.

[0016] In a further technical solution, the rotor assembly is provided with two bearings, which are spaced vertically along the axial direction, with the diameter of the upper bearing being smaller than that of the lower bearing.

[0017] The outer edge of the upper shell is provided with multiple upper buckles at intervals along the circumferential direction, and the outer edge of the lower shell is provided with multiple lower buckles at intervals along the circumferential direction. Each upper buckle is engaged with the corresponding lower buckle.

[0018] The upper shell is also provided with an upwardly protruding reduction shaft, on which a reduction gear is sleeved. The diameter of the reduction gear is larger than that of the output gear, and the reduction gear meshes with the output gear.

[0019] Two connecting lugs protruding from the lower shell extend outward from both sides of the upper shell, and each connecting lug is equipped with a connecting screw.

[0020] The advantages of this invention compared to existing technologies using the above structure are as follows: A flexible thin-film circuit board replaces the traditional, relatively thick PCB board and round wires. The lower round circuit board is positioned outside the lower housing, while the encoder is housed inside the lower housing via an encoding hole. Simultaneously, the encoding magnet is embedded within the rotor assembly, thereby reducing the axial installation space and the thickness of the permanent magnet synchronous motor. The thickness of the external connecting wires used to connect the permanent magnet synchronous motor and the feeder is reduced to below 0.2mm, further reducing the overall thickness of the feeder. This allows for the installation of more feeders in the same sized feeder station, improving mounting efficiency. Furthermore, the built-in encoder and encoding... The magnet detects the rotation angle of the rotor assembly in real time to reflect its specific position. The feeder control system can read this position information in real time and control the circuit based on the information, thereby improving the feeding accuracy. The coil is connected to the upper ring circuit board through a connecting pin header, reducing the ineffective winding length of the coil, facilitating soldering, simplifying the assembly process, and reducing production costs. The permanent magnet synchronous motor is a brushless motor, which forms a three-phase connection through nine pole posts. With the help of a five-pair magnetic ring, the maximum speed of the permanent magnet synchronous motor can reach 10,000 revolutions per minute. After deceleration, the feeder's feeding speed can reach 30 pcs / second, improving the feeding speed. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is an exploded view of the present invention;

[0024] Figure 3 This is a cross-sectional view of the present invention;

[0025] Figure 4 This is an exploded view of the stator assembly of this utility model;

[0026] Figure 5 This is an exploded view of the rotor assembly of this utility model;

[0027] Figure 6 This is a bottom view of the present invention;

[0028] Figure 7 This is a schematic diagram of the lower shell structure of this utility model;

[0029] Figure 8 This is a schematic diagram of the coil distribution of this utility model.

[0030] In the picture:

[0031] 1. Upper shell, 11. Upper clip, 12. Reduction shaft, 13. Reduction gear, 14. Connecting lug, 15. Connecting screw;

[0032] 2. Lower shell, 21. Encoding hole, 22. Filtering hole, 23. Circular encoding slot, 24. Bar encoding slot, 25. Lower clearance notch, 26. Lower positioning post, 27. Lower buckle;

[0033] 3 Stator assembly, 31 Upper coated sheet, 311 Upper positioning post, 32 Lower coated sheet, 33 Silicon steel sheet, 34 Wire insertion groove, 35 Pole post, 36 Coil, 37 Connecting pin header, 371 Connecting part;

[0034] 4 Rotor assembly, 41 Power magnetic ring, 42 Coupling, 421 Magnet slot, 43 Output shaft, 44 Shaft sleeve, 45 Output gear, 46 Rotor yoke, 47 Bearing, 48 Encoded magnet;

[0035] 5 Flexible thin film circuit board, 51 Upper ring circuit board, 511 Upper positioning hole, 52 Lower circular circuit board, 521 Encoder, 522 Filter capacitor, 523 Lower positioning hole, 53 External connecting wire, 54 Internal connecting wire, 55 Board-to-board connector.

[0036] 6. Protective cover plate, 61. Circular cover plate, 62. Strip cover plate, 63. Arc-shaped vertical plate, 64. First injection hole, 65. Second injection hole. Detailed Implementation

[0037] The following are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention.

[0038] An ultra-thin, high-precision permanent magnet synchronous motor for feeders, such as Figures 1 to 8As shown, the device comprises an upper shell 1 and a lower shell 2. A stator assembly 3 is disposed between the upper shell 1 and the lower shell 2. A rotor assembly 4 is disposed on the inner ring of the stator assembly 3. The rotor assembly 4 is rotatably connected to the upper shell 1. The device includes a flexible thin-film circuit board 5, which comprises an upper annular circuit board 51, a lower circular circuit board 52, an outer connecting wire 53, and an inner connecting wire 54. The upper annular circuit board 51 is disposed between the upper shell 1 and the stator assembly 3, and the stator assembly 3 is electrically connected to the upper annular circuit board 51. The lower circular circuit board 52 is disposed on the lower end face of the lower shell 2. A coding hole 21 penetrating the lower shell 2 is opened in the center of the lower shell 2. An encoder 521 is provided on the upper end face and is inserted into the encoder hole 21. A magnet slot 421 is provided on the lower part of the rotor assembly 4 and an encoder magnet 48 is embedded in the magnet slot 421. The encoder magnet 48 is located above the encoder 521. The inner connecting wire 54 is attached to the outer wall of the stator assembly 3. The upper end of the inner connecting wire 54 is connected to the upper annular circuit board 51 and the lower end of the inner connecting wire 54 is connected to the lower circular circuit board 52. One end of the outer connecting wire 53 is connected to the upper annular circuit board 51, the lower circular circuit board 52 or the inner connecting wire 54, and the other end of the outer connecting wire 53 is provided with a board-to-board connector 55. Traditional permanent magnet synchronous motors have two built-in PCBs for connecting the encoder 521 and the stator assembly 3, respectively. Because the PCBs are relatively thick, and the components on the PCBs and the encoder 521 occupy axial mounting space, the permanent magnet synchronous motor is quite thick. Furthermore, the PCBs require soldering round wires to connect to the feeder, which are also relatively thick, increasing the overall thickness of the feeder. This invention replaces the relatively thick PCBs and round wires with a flexible thin-film circuit board 5. The lower circular circuit board 52 is located outside the lower housing 2, and the encoder 521 is housed inside the lower housing 2 via the encoding insertion hole 21. Simultaneously, the encoding magnet... The encoder 48 is embedded within the rotor assembly 4, thereby reducing the axial installation space and the thickness of the permanent magnet synchronous motor (PMSM), reducing the PMSM thickness to 9mm and the outer diameter to 35mm. The thickness of the external connecting wires used to connect the PMSM and the feeder is reduced to below 0.2mm, further reducing the overall thickness of the feeder. This allows for the installation of more feeders in the same size feed station, improving placement efficiency. The built-in encoder 521 and encoder magnet 48 detect the rotation angle of the rotor assembly 4 in real time to reflect the specific position of the rotor assembly 4. The feeder control system can read this position information in real time and control the circuit based on this information, thereby improving feeding accuracy. The feeder can be quickly connected directly to the board-to-board connector 55 without soldering, simplifying installation.

[0039] Specifically, the lower end face of the lower shell 2 is provided with a circular coding groove 23 and a bar coding groove 24. The outer edge of the lower shell 2 is provided with a lower clearance notch 25. The circular coding groove 23 is located in the center of the lower shell 2. One end of the bar coding groove 24 is connected to the circular coding groove 23 and the other end is connected to the lower clearance notch 25. The outer side of the stator assembly 3 is provided with a wire-passing groove 34, which is located above the lower clearance notch 25. The lower circular circuit board 52 is embedded in the circular coding groove 23. The inner connecting wire 54 is embedded in the wire-passing groove 34. The lower end of the inner connecting wire 54 passes through the lower clearance notch 25 and the bar coding groove 24 in sequence and is connected to the lower circular circuit board 52. The outer connecting wire 53 is connected to the upper annular circuit board 51. The lower clearance notch 25 connects the barcode slot 24 and the wire-passing slot 34, so that the circular code slot 23, the barcode slot 24 and the wire-passing slot 34 are connected to form a wiring channel, so as to embed the inner connecting wire 54 and the lower circular circuit board 52 into the wiring channel, thereby preventing the inner connecting wire 54 and the lower circular circuit board 52 from protruding outside the stator assembly 3 and the lower shell 2, further reducing the thickness and diameter, and also limiting and protecting the inner connecting wire 54 and the lower circular circuit board 52.

[0040] Specifically, the lower shell 2 is also provided with a protective cover plate 6, which includes an integrally formed circular cover plate 61, a strip cover plate 62, and an arc-shaped upright plate 63. One end of the strip cover plate 62 is formed on the outer edge of the circular cover plate 61, and the other end of the strip cover plate 62 is integrally formed with the lower end of the arc-shaped upright plate 63. The circular cover plate 61 is embedded in the circular coding groove 23, the strip cover plate 62 is embedded in the bar coding groove 24, and the arc-shaped upright plate 63 is embedded in the wire-passing groove 34. Since the flexible thin film circuit board 5 is relatively thin, it is easily scratched when exposed to the outside, and there is a risk of breakage and damage. Therefore, by sealing the wiring channel with the protective cover plate 6, the bar coding groove 24 and the lower circular circuit board 52 can be covered, preventing them from being exposed to the outside, further protecting the bar coding groove 24 and the lower circular circuit board 52, and improving reliability and stability.

[0041] Specifically, at least two upper positioning posts 311 are provided on the lower end face of the upper shell 1 or the upper end face of the stator assembly 3, and at least two lower positioning posts 26 are provided between the circular coding groove 23 and the circular cover plate 61. The upper annular circuit board 51 is provided with upper positioning holes 511 corresponding to each upper positioning post 311, and the lower circular circuit board 52 is provided with lower positioning holes 523 corresponding to each lower positioning post 26. Each upper positioning post 311 is inserted into each upper positioning hole 511, and each lower positioning post 26 is inserted into each lower positioning hole 523. The upper annular circuit board 51 is positioned and installed by the upper positioning posts 311 and the upper positioning holes 511, and the lower circular circuit board 52 is positioned and installed by the lower positioning posts 26 and the lower positioning holes 523, thereby improving assembly efficiency.

[0042] Specifically, the inner wall of the circular coding groove 23 and the outer edge of the circular cover plate 61 are provided with a plurality of first glue-filling holes 64 at intervals along the circumferential direction. At least one second glue-filling hole 65 is provided on each side of the strip coding groove 24 and the strip cover plate 62. The first glue-filling holes 64 on the inner wall of the circular coding groove 23 and the first glue-filling holes 64 on the outer edge of the circular cover plate 61 enclose a circular first glue-filling hole 64. The second glue-filling holes 65 on both sides of the strip coding groove 24 and the second glue-filling holes 65 on both sides of the strip cover plate 62 enclose a circular second glue-filling hole 65. During assembly, glue is dripped through the first glue-filling holes 64 and the second glue-filling holes 65, allowing the glue to penetrate and seal and fix the connection. This allows the lower circular circuit board 52 to be pasted onto the lower shell 2, and the protective cover plate 6 to be pasted onto the lower circular circuit board 52 and the lower shell 2, eliminating the need for layer-by-layer pasting and further improving assembly efficiency.

[0043] Specifically, a filter recess 22 is provided through the lower end face of the lower shell 2, and the filter recess 22 is located within the circular encoder slot 23. A filter capacitor 522 is also provided on the upper end face of the lower circular circuit board 52, and the filter capacitor 522 is inserted into the filter recess 22. The filter capacitor 522 suppresses high-frequency noise, prevents the encoder 521 signal from being affected by electromagnetic interference generated by the permanent magnet synchronous motor itself, and stabilizes the power supply voltage, avoiding voltage fluctuations at the terminals during start-up, shutdown, or sudden load changes, thus ensuring the stability of the power supply to the encoder 521. The filter capacitor 522 is also inserted into the filter recess 22 to reduce the axial installation space.

[0044] Specifically, the stator assembly 3 includes a stator ring frame and multiple connecting pins 37. Multiple pole posts 35 are spaced circumferentially along the inner ring of the stator ring frame, and each pole post 35 is wound with a coil 36. Each connecting pin 37 passes through the stator ring frame axially. The beginning and end of each coil 36 are connected to the lower end of each connecting pin 37, and the upper end of each connecting pin 37 is connected to the upper annular circuit board 51. The coils 36 and the upper annular circuit board 51 are connected via the connecting pins 37, reducing the ineffective winding length of the coils 36, facilitating soldering, simplifying the assembly process, and reducing production costs.

[0045] Specifically, the upper end of the connecting pin 37 is bent at 90° to form a connecting portion 371. The lower end face of the upper annular circuit board 51 is provided with pads corresponding to each connecting portion 371. Each connecting portion 371 is soldered to its corresponding pad. The connecting portion 371 increases the connection area between the connecting pin 37 and the upper annular circuit board 51, preventing cold solder joints, improving reliability and stability, and facilitating soldering operations.

[0046] Specifically, the stator ring frame includes an upper coated sheet 31, a lower coated sheet 32, and a silicon steel frame. The silicon steel frame covers the space between the upper coated sheet 31 and the lower coated sheet 32. The silicon steel frame includes multiple silicon steel sheets 33 stacked along the axial direction. Each connecting pin 37 passes through the upper coated sheet 31 and the lower coated sheet 32. There are nine pole posts 35, with three adjacent pole posts 35 forming a group. There are six connecting pins 37. Three connecting pins 37 are connected to the wire ends of the coils 36 on the three groups of pole posts 35, and the other three connecting pins 37 are connected to the wire ends of the coils 36 on the three groups of pole posts 35. The multiple stacked silicon steel sheets 33 form the silicon steel frame. Then, through the coating process, the upper coated sheet 31 and the lower coated sheet 32 ​​are formed on the outside of the silicon steel frame. The upper coated sheet 31 and the lower coated sheet 32 ​​wrap the silicon steel frame, providing insulation and support. The coil 36 is wound around the outer side of the rubber-coated upper sheet 31 and the rubber-coated lower sheet 32, without contacting the silicon steel frame. For example... Figure 8 As shown, the nine pole posts 35 are divided into three groups, and the coils 36 wound in each group are divided into three-phase terminals. The wire ends of the coils 36 of the same phase are connected to the same connecting pin 37, and the wire ends of the coils 36 of the same phase are connected to the same connecting pin 37. The coils 36 adopt a star connection method. The coils 36 of each phase are on three adjacent pole posts 35, and the wire ends are connected to the lower end of the connecting pin 37 as close as possible. The advantage of this winding method is that the wires of the three phases UVW do not intersect each other in space. The reserved wire during winding can be made very short and neat, reducing the amount of copper wire used, thereby reducing the copper loss of the motor. Lower losses result in higher efficiency.

[0047] The rotor assembly 4 includes a power magnetic ring 41, a coupling 42, an output shaft 43, a bushing 44, an output gear 45, a rotor yoke 46, an encoding magnet 48, and at least one bearing 47. The power magnetic ring 41 is sleeved on the outside of the rotor yoke 46. The lower part of the coupling 42 is riveted to the lower part of the rotor yoke 46. The coupling 42 is located inside the rotor yoke 46. A magnet slot 421 is provided on the lower end face of the coupling 42. The encoding magnet 48 is embedded in the magnet slot 421 and is fixed to the coupling 42 by magnetic adhesive. The lower end of the output shaft 43 is fixedly connected to the upper part of the coupling 42. The bearing 47 is sleeved on the output shaft 43. The bushing 44 is sleeved on the bearing 47 and is fixedly connected to the upper shell 1. The output gear 45 is fixedly installed on the upper end of the output shaft 43 and is located above the upper shell 1. The power magnetic ring 41 has five pairs of magnetic poles in the radial direction, and the encoding magnet 48 has one pair of magnetic poles in the radial direction. The output gear 45, bearing 47, and coupling 42 are all interference-fitted with the output shaft 43. The bushing 44 is interference-fitted with the bearing 47. The power magnetic ring 41 is sleeved on the outside of the rotor yoke 46 and fixed by magnetic adhesive. The bushing 44 is interference-fitted with the upper housing 1. The bearing 47 and bushing 44 form a mechanical connection and are relatively stationary parts. The power magnetic ring 41, coupling 42, output shaft 43, output gear 45, rotor yoke 46, and coding magnet 48 are relatively rotating parts. The rotating parts have no displacement relative to the stationary parts. The fully tight-fitting rotor assembly 4 reduces operating noise and improves mechanical reliability. The coding magnet 48 is embedded in the coupling 42, so that the lower end face of the coding magnet 48 is flush with the lower end face of the power magnetic ring 41. The coding magnet 48 does not protrude downwards, thereby further reducing the axial installation space. The permanent magnet synchronous motor is a brushless motor. It forms a three-phase connection through nine pole posts 35 and is equipped with a power magnetic ring 41 with five pairs of magnetic poles, so that the maximum speed of the permanent magnet synchronous motor can reach 10,000 revolutions per minute. After deceleration, the feeder's feeding speed can reach 30 pcs / second, thus improving the feeding speed.

[0048] Specifically, the rotor assembly 4 is provided with two bearings 47, which are spaced vertically along the axial direction. The diameter of the upper bearing 47 is smaller than that of the lower bearing 47. By providing two bearings 47, the connection area between the rotating and stationary parts is increased, preventing radial runout of the rotating part and further improving operational stability. The lower bearing 47 is tightly fitted onto the coupling 42, and the upper bearing 47 is tightly fitted onto the output shaft 43. The outer edge of the upper shell 1 is provided with multiple upper latches 11 spaced along the circumferential direction, and the outer edge of the lower shell 2 is provided with multiple lower latches 27 spaced along the circumferential direction. Each upper latch 11 engages with the corresponding lower latch 27. The upper shell 1 and the lower shell 2 are connected by the upper latches 11 and the lower latches 27, which clamp and fix the stator assembly 3 for easy assembly. The upper housing 1 is also provided with an upwardly protruding reduction shaft 12, on which a reduction gear 13 is fitted. The diameter of the reduction gear 13 is larger than the diameter of the output gear 45, and the reduction gear 13 meshes with the output gear 45. The upper housing 1 is connected to the reduction gear 13 through the reduction shaft 12, so that the permanent magnet synchronous motor's built-in reduction gear 45 reduces the output gear 45, thereby reducing the number of reduction gear sets on the feeder. Two connecting lugs 14 protrude outward from both sides of the upper housing 1, extending from the lower housing 2. Each connecting lug 14 is provided with a connecting screw 15. The permanent magnet synchronous motor is fixed to the feeder by the connecting lugs 14 and the connecting screws 15, facilitating installation.

[0049] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. An ultra-thin, high-precision permanent magnet synchronous motor for feeders, comprising an upper shell (1) and a lower shell (2), wherein a stator assembly (3) is disposed between the upper shell (1) and the lower shell (2), and a rotor assembly (4) is disposed on the inner ring of the stator assembly (3), the rotor assembly (4) being rotatably connected to the upper shell (1), characterized in that: The system includes a flexible thin-film circuit board (5), which comprises an upper annular circuit board (51), a lower circular circuit board (52), external connecting wires (53), and internal connecting wires (54). The upper annular circuit board (51) is disposed between the upper shell (1) and the stator assembly (3), and the stator assembly (3) is electrically connected to the upper annular circuit board (51). The lower circular circuit board (52) is disposed on the lower end face of the lower shell (2), and an encoder (521) is disposed on the upper end face of the lower circular circuit board (52). The encoder (521) is inserted into the encoder (21). The rotor assembly (4) has a magnet slot (421) at its lower part. The magnet slot (421) is inlaid with an encoding magnet (48). The encoding magnet (48) is located above the encoder (521). The inner connecting wire (54) is attached to the outer wall of the stator assembly (3). The upper end of the inner connecting wire (54) is connected to the upper annular circuit board (51), and the lower end of the inner connecting wire (54) is connected to the lower circular circuit board (52). One end of the outer connecting wire (53) is connected to the upper annular circuit board (51), the lower circular circuit board (52), or the inner connecting wire (54). The other end of the outer connecting wire (53) is provided with a board-to-board connector (55).

2. The ultra-thin, high-precision permanent magnet synchronous motor for a feeder according to claim 1, characterized in that: The lower end face of the lower shell (2) is provided with a circular coding groove (23) and a bar coding groove (24). The outer edge of the lower shell (2) is provided with a lower clearance notch (25). The circular coding groove (23) is located in the center of the lower shell (2). One end of the bar coding groove (24) is connected to the circular coding groove (23) and the other end is connected to the lower clearance notch (25). The outer side of the stator assembly (3) is provided with a wire threading groove (34). The wire threading groove (34) is located above the lower clearance notch (25). The lower circular circuit board (52) is embedded in the circular coding groove (23). The inner connecting wire (54) is embedded in the wire threading groove (34). The lower end of the inner connecting wire (54) passes through the lower clearance notch (25) and the bar coding groove (24) in sequence and is connected to the lower circular circuit board (52). The outer connecting wire (53) is connected to the upper annular circuit board (51).

3. The ultra-thin, high-precision permanent magnet synchronous motor for a feeder according to claim 2, characterized in that: The lower shell (2) is also provided with a protective cover plate (6). The protective cover plate (6) includes an integrally formed circular cover plate (61), a strip cover plate (62), and an arc-shaped upright plate (63). One end of the strip cover plate (62) is formed on the outer edge of the circular cover plate (61), and the other end of the strip cover plate (62) is integrally formed with the lower end of the arc-shaped upright plate (63). The circular cover plate (61) is embedded in the circular coding groove (23), the strip cover plate (62) is embedded in the strip coding groove (24), and the arc-shaped upright plate (63) is embedded in the wire threading groove (34).

4. The ultra-thin, high-precision permanent magnet synchronous motor for a feeder according to claim 3, characterized in that: At least two upper positioning posts (311) are provided on the lower end face of the upper shell (1) or the upper end face of the stator assembly (3). At least two lower positioning posts (26) are provided between the circular coding groove (23) and the circular cover plate (61). The upper annular circuit board (51) is provided with upper positioning holes (511) corresponding to each upper positioning post (311). The lower circular circuit board (52) is provided with lower positioning holes (523) corresponding to each lower positioning post (26). Each upper positioning post (311) is inserted into each upper positioning hole (511), and each lower positioning post (26) is inserted into each lower positioning hole (523).

5. The ultra-thin, high-precision permanent magnet synchronous motor for a feeder according to claim 3, characterized in that: The inner sidewall of the circular coding groove (23) and / or the outer edge of the circular cover plate (61) are provided with a plurality of first glue-filling holes (64) at intervals along the circumferential direction; at least one second glue-filling hole (65) is provided on both sides of the strip coding groove (24) and / or on both sides of the strip cover plate (62).

6. The ultra-thin, high-precision permanent magnet synchronous motor for a feeder according to claim 2, characterized in that: The lower end face of the lower shell (2) is also provided with a filter recess (22) that penetrates the lower shell (2). The filter recess (22) is located in the circular coding groove (23). The upper end face of the lower circular circuit board (52) is also provided with a filter capacitor (522), which is inserted into the filter recess (22).

7. An ultra-thin, high-precision permanent magnet synchronous motor for a feeder according to any one of claims 1 to 6, characterized in that: The stator assembly (3) includes a stator ring frame and multiple connecting pins (37). The inner ring of the stator ring frame is provided with multiple pole posts (35) spaced apart along the circumferential direction. Each pole post (35) is wound with a coil (36). Each connecting pin (37) passes through the stator ring frame along the axial direction. The wire ends of each coil (36) are connected to the lower ends of each connecting pin (37). The upper ends of each connecting pin (37) are connected to the upper annular circuit board (51).

8. The ultra-thin, high-precision permanent magnet synchronous motor for a feeder according to claim 7, characterized in that: The upper end of the connecting pin (37) is bent at 90° to form a connecting part (371). The lower end of the upper annular circuit board (51) is provided with pads corresponding to each connecting part (371). Each connecting part (371) is soldered to the corresponding pad by soldering.

9. The ultra-thin, high-precision permanent magnet synchronous motor for a feeder according to claim 7, characterized in that: The stator ring frame includes an upper coated sheet (31), a lower coated sheet (32), and a silicon steel frame. The silicon steel frame covers the upper coated sheet (31) and the lower coated sheet (32). The silicon steel frame includes multiple silicon steel sheets (33) stacked along the axial direction. Each connecting pin (37) passes through the upper coated sheet (31) and the lower coated sheet (32). There are nine pole posts (35). Three adjacent pole posts (35) form a group. There are six connecting pins (37). Three connecting pins (37) are connected to the wire ends of the coils (36) on the three groups of pole posts (35), and the other three connecting pins (37) are connected to the wire ends of the coils (36) on the three groups of pole posts (35). The rotor assembly (4) includes a power magnetic ring (41), a coupling (42), an output shaft (43), a bushing (44), an output gear (45), a rotor yoke (46), the coded magnet (48), and at least one bearing (47). The power magnetic ring (41) is sleeved on the outside of the rotor yoke (46). The lower part of the coupling (42) is riveted to the lower part of the rotor yoke (46). The coupling (42) is located inside the rotor yoke (46). The magnet slot (421) is provided on the lower end face of the coupling (42). The coded magnet (47) is... 8) The lower end of the output shaft (43) is fixedly connected to the upper part of the connecting shaft (42) and embedded in the magnet slot (421). The bearing (47) is sleeved on the output shaft (43). The bushing (44) is sleeved on the bearing (47) and fixedly connected to the upper shell (1). The output gear (45) is fixedly installed on the upper end of the output shaft (43) and located above the upper shell (1). The power magnetic ring (41) has five pairs of magnetic poles in the radial direction. The coding magnet (48) has one pair of magnetic poles in the radial direction.

10. The ultra-thin, high-precision permanent magnet synchronous motor for a feeder according to claim 9, characterized in that: The rotor assembly (4) is provided with two bearings (47), which are spaced apart vertically along the axial direction, with the diameter of the upper bearing (47) being smaller than that of the lower bearing (47). The outer edge of the upper shell (1) is provided with a plurality of upper buckles (11) at intervals along the circumferential direction, and the outer edge of the lower shell (2) is provided with a plurality of lower buckles (27) at intervals along the circumferential direction. Each upper buckle (11) is engaged with the corresponding lower buckle (27). The upper shell (1) is also provided with an upwardly protruding reduction shaft (12), and a reduction gear (13) is sleeved on the reduction shaft (12). The diameter of the reduction gear (13) is larger than the diameter of the output gear (45), and the reduction gear (13) meshes with the output gear (45). Two connecting lugs (14) protrude outward from the two sides of the upper shell (1) and protrude from the lower shell (2). Each of the two connecting lugs (14) is provided with a connecting screw (15).

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