Stator unit, stator assembly and stepping motor

Abstract

The invention provides a stator unit, a stator assembly and a stepping motor. The stator unit comprises a coil framework and a stator shell. A protruding part is arranged on the outer side wall of the bottom of the coil framework and protrudes out of the stator shell in the radial direction. The stator unit also comprises three L-shaped conductive needles which are distributed at intervals along the width direction of the protruding part. The three conductive needles are fixed on the protruding part, and the vertical section of each conductive needle extends out of the protruding part from bottom to top along the axial direction of the stator unit and is used for being fixed and electrically connected with a pin of a coil wound on the coil framework; the horizontal section of each conductive needle extends out of the protruding part along the radial direction of the stator unit, and the horizontal section of each conductive needle is used for being plugged and electrically connected with a conductive socket in a matched manner; the stator assembly comprises the stator unit, and the stepping motor comprises the stator assembly. The device has the advantages of being simple in structure and convenient to assemble.

Description

Stator unit, stator assembly and stepper motor Technical Field

[0001] This invention relates to the field of stepper motor technology, and more specifically, to a stator unit, a stator assembly, and a stepper motor. Background Technology

[0002] With the continuous improvement of automotive intelligence, the air conditioning vent grilles in automobiles are gradually adopting automated control via stepper motor drive. Currently, Chinese Patent Publication No. CN209472527U discloses a low-noise stepper motor transmission structure. The motor mechanism (stepper motor) used in this structure has the disadvantage of complex structure. In this motor mechanism, the winding post used to electrically connect with the coil winding and the conductive pin used to cooperate with the conductive socket are independent structures. Moreover, the winding post and the conductive pin need to be fixed and electrically connected by a circuit board, resulting in the disadvantages of many motor mechanism parts, complex structure and troublesome assembly. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a stator unit, stator assembly and stepper motor, which have the advantages of simple structure and convenient assembly.

[0004] This invention provides a stator unit, including a coil frame and a stator housing that wraps around and fixes the coil frame to the outside; a protrusion is provided on the outer side wall at the bottom of the coil frame, the protrusion protruding radially out of the stator housing; the stator unit also includes three "L"-shaped conductive pins spaced apart along the width direction of the protrusion; all three conductive pins are fixed on the protrusion, the vertical segment of each conductive pin extends from bottom to top along the axial direction of the stator unit out of the protrusion, the vertical segment of each conductive pin is used to fix and electrically connect with the pin of the coil wound on the coil frame, the horizontal segment of each conductive pin extends radially out of the protrusion, the horizontal segment of each conductive pin is used to mate with and electrically connect with a conductive socket.

[0005] By adopting the above structure, the conductive pins in the stator unit are integrated into one piece. This means that the conductive pins can both fix and electrically connect with the coil pins, and also connect and electrically connect with the conductive socket. This reduces the number of parts in the stator unit, thus simplifying its structure. Consequently, the stator unit has the advantages of simple structure and easy assembly. In addition, it also reduces the production cost of the stator unit.

[0006] In one possible implementation, the upper surface of the protrusion is provided with a sleeve portion corresponding to each of the three conductive pins. Each sleeve portion has an insertion hole on its inner side, and the lower end of each insertion hole extends to the lower surface of the protrusion. A slot is provided on the side wall of the lower part of the insertion hole. The vertical section of each conductive pin passes through the corresponding insertion hole from bottom to top, and the horizontal section of each conductive pin is engaged in the corresponding slot. With this structure, after the three conductive pins are assembled with the protrusion, the vertical section of each conductive pin can be tightly inserted into the corresponding insertion hole. Each horizontal segment of the conductive pin can be locked into the corresponding slot, enabling reliable assembly of the conductive pin with the protrusion. After the vertical segment of the conductive pin passes through the corresponding insertion hole from bottom to top, the end of the vertical segment of the conductive pin can extend out of the socket. The pin of the coil wound on the coil frame can be wound around the end of the vertical segment of the conductive pin and fixed to the vertical segment of the conductive pin by tinning to achieve electrical connection. The horizontal segment of the conductive pin extending out of the slot is used to mate with the conductive socket and achieve electrical connection.

[0007] In one possible implementation, two expansion portions are symmetrically arranged on the inner wall of the lower end of each socket. The upper ends of the two expansion portions form limiting steps. The expansion portions are used for the side of the press-fitting fixture to slide in so that the press-fitting fixture can press the conductive pin into the socket and the slot. The limiting steps are used to abut against the end of the press-fitting fixture. With this structure, when the conductive pin is assembled with the protrusion, the conductive pin can be press-fitted by the press-fitting fixture. At this time, the vertical section of the conductive pin can be inserted into the socket, and the horizontal section of the conductive pin can be inserted into the slot. After the conductive pin and the protrusion are pressed into place by the press-fitting fixture, the end of the press-fitting fixture can abut against the limiting steps, thereby limiting the press-fitting fixture and the protrusion to avoid excessive compression of the conductive pin.

[0008] In one possible implementation, an opening groove is provided on the lower end face of the protrusion and on both sides of each slot. The opening groove is used for inserting a pressing tool. When the pressing tool presses the protrusion on both sides of the opening groove to deform the protrusion, it presses the horizontal section of the conductive needle into the slot. With this structure, after the conductive needle and the protrusion are assembled in place, the end of the pressing tool can be inserted into the protrusion on both sides of the opening groove. Subsequently, the pressing tool can press the protrusion on both sides of the opening groove to deform the protrusion. After the protrusion is deformed, the horizontal section of the conductive needle can be pressed into the slot.

[0009] In one possible implementation, grooves are provided on the outer walls of the two sleeves located on both sides of the width of the protrusion. The grooves are located at the connection between the sleeve and the protrusion and are used for the pins of the coil wound on the coil frame to be inserted. With this structure, the pins of the coil connected to the vertical sections of the conductive pins located on both sides of the width of the protrusion can be inserted into the grooves on the outer walls of the corresponding sleeves, thereby enabling the pins of the coil to be limited.

[0010] The present invention also provides a stator assembly, including a connecting plate, and the stator assembly further includes the aforementioned stator unit; two stator units are arranged symmetrically vertically and abut against each other, and the connecting plate is provided with through holes corresponding one-to-one with the horizontal segments of the conductive pins in the two stator units. The horizontal segment of each conductive pin passes through the corresponding through hole and extends out of the connecting plate and is tightly fitted with the through hole; when the stator assembly adopts the aforementioned stator unit, since the conductive pins in each stator unit are all integral structures, that is, the conductive pins can both fix and electrically connect with the coil pins, and also cooperate and electrically connect with the conductive socket, thereby reducing the number of parts in the stator unit and stator assembly, that is, simplifying the structure of the stator unit and stator assembly, thus making the stator unit and stator assembly have the advantages of simple structure and convenient assembly. In addition, it can also reduce the production cost of the stator unit and stator assembly.

[0011] In one possible implementation, the stator assembly further includes a conductive sheet; the horizontal segment of the conductive pin located in the middle of each stator unit is fixed to one end of the conductive sheet and conducts electricity; by setting the conductive sheet, after the two ends of the conductive sheet are fixed to and conduct electricity connected to the horizontal segment of the conductive pin located in the middle of each stator unit, the conductive sheet can realize the electrical connection to the common end of the stator assembly.

[0012] In one possible implementation, both ends of the conductive sheet are provided with bowl-shaped protrusions that extend outward toward the connecting plate. The center of the bowl-shaped protrusion forms a channel for the horizontal section of the conductive needle to pass through from the inside to the outside. Several claws are provided on the inner wall of the channel at circumferential intervals. Several claws on the inner wall of each channel simultaneously clamp onto the outer wall of the horizontal section of the conductive needle at the corresponding position. By adopting this structure, after the horizontal section of the conductive needle passes through the corresponding channel, several claws on the inner wall of each channel can simultaneously clamp onto the outer wall of the horizontal section of the conductive needle at the corresponding position, thereby achieving reliable fixation and electrical connection between the conductive sheet and the horizontal section of the conductive needle, and has the advantage of convenient fixation of the horizontal section of the conductive sheet and the conductive needle.

[0013] In one possible implementation, the outer wall of the conductive sheet abuts against the inner wall of the connecting plate. The inner wall of the connecting plate has two bowl-shaped concave surfaces, each designed to engage with one of the bowl-shaped protrusions. Both sides of the conductive sheet are bent toward one side of the connecting plate to form spring clips. The connecting plate has locking holes corresponding to the two spring clips. Each locking hole has an inverted buckle on its inner wall. Each spring clip is inserted into the locking hole at the corresponding position and engages with the inverted buckle. With this structure, since the inner wall of the connecting plate has two bowl-shaped concave surfaces, each designed to engage with one of the bowl-shaped protrusions, the connecting plate and the conductive sheet can be positioned together after assembly. Furthermore, after each spring clip is inserted into the locking hole at the corresponding position and engages with the inverted buckle, the conductive sheet can be reliably fastened to the connecting plate. This design also offers the advantage of easy assembly of the conductive sheet and the connecting plate.

[0014] The present invention also provides a stepper motor, which includes the stator assembly described above. When the stepper motor adopts the stator assembly described above, since the conductive pins in each stator unit are all integral structures, the conductive pins can both fix and electrically connect with the coil pins, and also cooperate and electrically connect with the conductive socket. This reduces the number of parts in the stator unit and stator assembly, thus simplifying the structure of the stator unit and stator assembly. Consequently, the stepper motor has the advantages of simple structure and convenient assembly. In addition, it can also reduce the production cost of the stepper motor. Attached Figure Description

[0015] Figure 1 is a three-dimensional structural diagram of the first stator unit; Figure 2 is a three-dimensional structural diagram of the second stator unit; Figure 3 is a three-dimensional structural diagram of the third stator unit; Figure 4 is an enlarged structural diagram of point A in Figure 3; Figure 5 is a three-dimensional sectional view of the stator unit; Figure 6 is a three-dimensional structural diagram of the stator assembly; Figure 7 is a three-dimensional exploded three-dimensional structural diagram of the first part of the stator assembly; Figure 8 is an enlarged structural diagram of point B in Figure 7; Figure 9 is a three-dimensional sectional view of the first stator assembly; Figure 10 is an enlarged structural diagram of point C in Figure 9; Figure 11 is a two-dimensional sectional view of the stator assembly; Figure 12 is an enlarged structural diagram of point D in Figure 11; Figure 13 is a three-dimensional exploded three-dimensional structural diagram of the second part of the stator assembly. Detailed Implementation

[0016] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0017] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0018] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0019] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Referring to Figures 1-13, this application discloses a stator unit, including a coil frame 1 and a stator housing 2 that wraps around and is fixed to the outside of the coil frame 1; a protrusion 11 is provided on the outer side wall at the bottom of the coil frame 1, the protrusion 11 protruding radially out of the stator housing 2; the stator unit also includes three “L”-shaped conductive pins 3 spaced apart along the width direction of the protrusion 11; the three conductive pins 3 are all fixed on the protrusion 11, the vertical segment 31 of each conductive pin 3 extends from bottom to top along the axial direction of the stator unit out of the protrusion 11, the vertical segment 31 of each conductive pin 3 is used to fix and electrically connect with the pin of the coil wound on the coil frame 1, the horizontal segment 32 of each conductive pin 3 extends radially out of the protrusion 11, the horizontal segment of each conductive pin 3 is used to cooperate with and electrically connect with a conductive socket.

[0021] The upper end face of the protrusion 11 is provided with a sleeve portion 12 corresponding to each of the three conductive pins 3. Each sleeve portion 12 has an insertion hole 13 formed on its inner side. The lower end of each insertion hole 13 extends to the lower end face of the protrusion 11. A slot 14 is provided on the side wall of the lower part of the insertion hole 13. The vertical section 31 of each conductive pin 3 passes through the corresponding insertion hole 13 from bottom to top, and the horizontal section 32 of each conductive pin 3 is engaged in the corresponding slot 14. With this structure, after the three conductive pins are assembled with the protrusion, the vertical section of each conductive pin can be tightly inserted. Each horizontal segment of the conductive pin can be locked into the corresponding slot at the corresponding position of the socket, thereby enabling reliable assembly of the conductive pin with the protrusion. After the vertical segment of the conductive pin passes through the corresponding socket from bottom to top, the end of the vertical segment of the conductive pin can extend out of the socket. The pin of the coil wound on the coil frame can be wound around the end of the vertical segment of the conductive pin and fixed to the vertical segment of the conductive pin by tinning to achieve electrical connection. The horizontal segment of the conductive pin extending out of the slot is used to mate with the conductive socket to achieve electrical connection.

[0022] Two expansion portions 15 are symmetrically arranged on the inner wall of the lower end of each insertion hole 13. The upper end of each expansion portion 15 forms a limiting step 16. The expansion portion 15 is used for the side of the pressing tool to slide in so that the pressing tool can press the conductive needle 3 into the insertion hole 13 and the slot 14. The limiting step 16 is used to abut against the end of the pressing tool. With this structure, when the conductive needle is assembled with the protrusion, the conductive needle can be pressed by the pressing tool. At this time, the vertical section of the conductive needle can be inserted into the insertion hole, and the horizontal section of the conductive needle can be inserted into the slot. After the conductive needle and the protrusion are pressed into place by the pressing tool, the end of the pressing tool can abut against the limiting step, thereby limiting the pressing tool and the protrusion to avoid excessive compression of the conductive needle.

[0023] An opening groove 17 is provided on the lower end surface of the protrusion 11 and on both sides of each slot 14. The opening groove 17 is used for inserting the extrusion tool. When the extrusion tool extrudes the protrusion 11 on both sides of the opening groove 17 to deform the protrusion 11, the horizontal section 32 of the conductive needle 3 is pressed into the slot 14. With this structure, after the conductive needle and the protrusion are assembled in place, the end of the extrusion tool can be inserted into the protrusion on both sides of the opening groove. Then, the extrusion tool can extrude the protrusion on both sides of the opening groove to deform the protrusion. After the protrusion is deformed, the horizontal section of the conductive needle can be pressed into the slot.

[0024] A wire groove 18 is provided on the outer wall of each of the two sleeve portions 12 located on both sides of the width direction of the protrusion 11. The wire groove 18 is located at the connection between the sleeve portion 12 and the protrusion 11. The wire groove 18 is used for the pins of the coil wound on the coil frame 1 to be inserted. With this structure, the pins of the coil connected to the vertical sections of the conductive pins located on both sides of the width direction of the protrusion can be inserted into the wire grooves on the outer wall of the corresponding sleeve portion, thereby achieving the limitation of the pins of the coil.

[0025] Referring again to Figures 1-13, this embodiment also discloses a stator assembly, including a connecting plate 4. The stator assembly also includes the aforementioned stator units. Two stator units are arranged symmetrically vertically and abut against each other. The connecting plate 4 is provided with through holes 41 that correspond one-to-one with the horizontal segments 32 of the conductive pins 3 in the two stator units. The horizontal segment 32 of each conductive pin 3 passes through the corresponding through hole 41 and extends out of the connecting plate 4, tightly fitting with the through hole 41. When the stator assembly adopts the aforementioned stator units, since the conductive pins in each stator unit are all integral structures, the conductive pins can both fix and electrically connect with the coil pins, and also cooperate and electrically connect with the conductive socket. This reduces the number of parts in the stator units and stator assemblies, thus simplifying the structure of the stator units and stator assemblies. Consequently, the stator units and stator assemblies have the advantages of simple structure and convenient assembly. In addition, the production cost of the stator units and stator assemblies can also be reduced.

[0026] The stator assembly also includes a conductive sheet 5; the horizontal segment 32 of the conductive pin 3 located in the middle of each stator unit is fixed and conducts electricity to one end of the conductive sheet 5; by setting the conductive sheet, after the two ends of the conductive sheet are fixed and conduct electricity to the horizontal segment of the conductive pin located in the middle of each stator unit, the conductive sheet can realize the electrical connection to the common end of the stator assembly.

[0027] Both ends of the conductive sheet 5 are provided with bowl-shaped protrusions 51 protruding from the side of the connecting plate 4. The middle of the bowl-shaped protrusions 51 forms a channel 52 for the horizontal section 32 of the conductive needle 3 to pass through from the inside to the outside. Several claws 53 are provided on the inner wall of the channel 52 in a circumferentially spaced manner. Several claws 53 located on the inner wall of each channel 52 simultaneously bite the outer wall of the horizontal section 32 of the conductive needle 3 at the corresponding position. With this structure, after the horizontal section of the conductive needle passes through the corresponding channel, several claws located on the inner wall of each channel can simultaneously bite the outer wall of the horizontal section of the conductive needle at the corresponding position, thereby realizing the reliable fixation and electrical connection between the conductive sheet and the horizontal section of the conductive needle, and has the advantage of convenient fixation between the conductive sheet and the horizontal section of the conductive needle.

[0028] The outer sidewall of the conductive sheet 5 abuts against the inner sidewall of the connecting plate 4. The inner wall of the connecting plate 4 is provided with two bowl-shaped concave surfaces 42, each for engaging with one of the bowl-shaped protrusions 51. Both sides of the conductive sheet 5 are bent toward one side of the connecting plate 4 to form spring buckles 54. The connecting plate 4 is provided with locking holes 43 corresponding to the two spring buckles 54. Each locking hole 43 has an inverted buckle 44 on its inner wall. Each spring buckle 54 is inserted into the locking hole 43 at the corresponding position and engages with the inverted buckle 44. With this structure, since the inner wall of the connecting plate is provided with two bowl-shaped concave surfaces for engaging with one of the bowl-shaped protrusions, the connecting plate and the conductive sheet can be positioned after assembly. After each spring buckle is inserted into the locking hole at the corresponding position and engages with the inverted buckle, the conductive sheet can be reliably fastened to the connecting plate, and the assembly of the conductive sheet and the connecting plate is convenient.

[0029] Referring again to Figures 1-13, this embodiment also discloses a stepper motor, which includes the stator assembly described above. When the stepper motor adopts the stator assembly described above, since the conductive pins in each stator unit are all integral structures, the conductive pins can both fix and electrically connect with the coil pins, and also cooperate and electrically connect with the conductive socket. This reduces the number of parts in the stator unit and stator assembly, thus simplifying the structure of the stator unit and stator assembly. As a result, the stepper motor has the advantages of simple structure and convenient assembly. In addition, it can also reduce the production cost of the stepper motor.

[0030] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A stator unit, comprising a coil frame (1) and a stator housing (2) enclosing and fixed outside the coil frame (1); a protrusion (11) is provided on the outer side wall of the bottom of the coil frame (1), the protrusion (11) protruding radially out of the stator housing (2); characterized in that: The stator unit also includes three L-shaped conductive pins (3) spaced apart along the width direction of the protrusion (11); the three conductive pins (3) are all fixed on the protrusion (11), the vertical section (31) of each conductive pin (3) extends out of the protrusion (11) from bottom to top along the axial direction of the stator unit, the vertical section (31) of each conductive pin (3) is used to fix and electrically connect with the pin of the coil wound on the coil frame (1), the horizontal section (32) of each conductive pin (3) extends out of the protrusion (11) along the radial direction of the stator unit, and the horizontal section of each conductive pin (3) is used to cooperate with the conductive socket for insertion and electrical connection.

2. The stator unit according to claim 1, characterized in that: The upper surface of the protrusion (11) is provided with a sleeve (12) corresponding to the three conductive pins (3). Each sleeve (12) has an insertion hole (13) formed on its inner side. The lower end of each insertion hole (13) extends to the lower surface of the protrusion (11). A slot (14) is provided on the side wall of the lower part of the insertion hole (13). The vertical section (31) of each conductive pin (3) passes through the insertion hole (13) at the corresponding position from bottom to top. The horizontal section (32) of each conductive pin (3) is engaged in the slot (14) at the corresponding position.

3. The stator unit according to claim 2, characterized in that: Two expansion portions (15) are symmetrically arranged on the inner wall of the lower end of each of the sockets (13). The upper ends of the two expansion portions (15) are formed with limiting steps (16). The expansion portions (15) are used for the side of the press-fitting fixture to slide in so that the press-fitting fixture can press the conductive pin (3) into the socket (13) and the slot (14). The limiting steps (16) are used to abut against the pins of the press-fitting fixture.

4. The stator unit according to claim 2, characterized in that: An opening groove (17) is provided on the lower end surface of the protrusion (11) and on both sides of each slot (14). The opening groove (17) is used for inserting the extrusion tool. When the extrusion tool extrudes the protrusion (11) on both sides of the opening groove (17) to deform the protrusion (11), the horizontal section (32) of the conductive needle (3) is pressed into the slot (14).

5. The stator unit according to any one of claims 2-4, characterized in that: A wire groove (18) is provided on the outer wall of the two sleeve portions (12) located on both sides of the width direction of the protrusion (11). The wire groove (18) is located at the connection between the sleeve portion (12) and the protrusion (11). The wire groove (18) is used for the pins of the coil wound on the coil frame (1) to be inserted.

6. A stator assembly, comprising a connecting plate (4), characterized in that: The stator assembly further includes two stator units as described in any one of claims 1-5; the two stator units are arranged symmetrically in the upper and lower positions and abut against each other, and the connecting plate (4) is provided with through holes (41) that correspond one-to-one with the horizontal segments (32) of the conductive pins (3) in the two stator units. The horizontal segment (32) of each conductive pin (3) passes through the through hole (41) at the corresponding position and extends out of the connecting plate (4) and is tightly fitted with the through hole (41).

7. The stator assembly according to claim 6, characterized in that: The stator assembly also includes a conductive sheet (5); the horizontal segment (32) of the conductive needle (3) located in the middle of each stator unit is fixed to one end of the conductive sheet (5) and conducts electricity.

8. The stator assembly according to claim 7, characterized in that: Both ends of the conductive sheet (5) are provided with bowl-shaped protrusions (51) protruding from the conductive sheet (5) towards the connecting plate (4). The middle of the bowl-shaped protrusions (51) forms a channel (52) for the horizontal section (32) of the conductive needle (3) to pass through from the inside to the outside. The inner wall of the channel (52) is provided with a number of circumferentially spaced claws (53). The claws (53) located on the inner wall of each channel (52) simultaneously bite the outer wall of the horizontal section (32) of the conductive needle (3) at the corresponding position.

9. The stator assembly according to claim 8, characterized in that: The outer sidewall of the conductive sheet (5) abuts against the inner sidewall of the connecting plate (4). The inner wall of the connecting plate (4) is provided with two bowl-shaped concave surfaces (42) respectively for fitting into one of the bowl-shaped protrusions (51). Both sides of the conductive sheet (5) are bent toward one side of the connecting plate (4) to form spring buckles (54). The connecting plate (4) is provided with locking holes (43) corresponding to the two spring buckles (54). Each locking hole (43) has a buckle (44) on its inner wall. Each spring buckle (54) is inserted into the locking hole (43) at the corresponding position and is fastened to the buckle (44).

10. A stepper motor, characterized in that: Includes the stator assembly as described in any one of claims 6-9.

Images