CN214255929U

CN214255929U - Stator skeleton subassembly, stator module and step motor including it

Info

Publication number: CN214255929U
Application number: CN202120525222.0U
Authority: CN
Inventors: 金孝云; 焦雪波; 丁维超; 赵殿合; 殷芳国
Original assignee: Jiangsu Leili Motor Co Ltd
Current assignee: Jiangsu Leili Motor Co Ltd
Priority date: 2021-03-12
Filing date: 2021-03-12
Publication date: 2021-09-21
Anticipated expiration: 2031-03-12

Abstract

Provided are a stator frame assembly, a stator assembly including the same, and a stepping motor including the same. The stator bobbin assembly includes a bobbin and a first terminal block. The bobbin provides a winding space in which a winding wire is wound and a rotor cavity having a common central axis. The first terminal block includes a first terminal block body, a plurality of first pin holes formed in the first terminal block body for mounting terminal pins, and a first stopper. The first limiting part is provided with a first limiting plane perpendicular to the extending direction of the first pin hole and used for positioning a circuit board which is installed on the stator framework assembly through the terminal pin in the extending direction of the first pin hole. The distance between the first limit plane and the first side surface is in the range of 0.5-2 mm. The first limiting plane of the first limiting part limits the position of the circuit board in the extending direction of the first pin hole.

Description

Stator skeleton subassembly, stator module and step motor including it

Technical Field

Embodiments of the present invention relate to a stator frame assembly, a stator assembly including such a stator frame assembly and a stepping motor including such a stator frame assembly.

Background

Claw utmost point formula step motor wide application in intelligent house field. A claw-pole stepper motor may include a housing and a stator assembly, a rotor assembly, and a gear assembly mounted inside the housing. The stator assembly includes a stator frame assembly, a first corresponding pole plate having a plurality of first corresponding pole claws and a second corresponding pole plate having a plurality of second corresponding pole claws. The stator frame assembly includes a first frame portion, a first pole plate having a plurality of first pole claws that mate with a plurality of first corresponding pole claws, a second pole plate having a plurality of second pole claws that mate with a plurality of second corresponding pole claws, and a second frame portion.

With the improvement of the life quality of people, the market reject ratio of products in the field of smart homes and the like is high, the reject ratio of the existing claw-pole stepping motor is controlled to be about 10PPM, but the more rigorous requirements of special customers cannot be met, and the customers even pursue zero reject ratio. At present, one of the disadvantages occurring in the claw-pole stepping motor is the problem of wire breakage of the winding wire.

SUMMERY OF THE UTILITY MODEL

At least one embodiment of the present disclosure provides a stator frame assembly including a frame and a first terminal block. The bobbin provides a winding space in which a winding wire is wound and a rotor cavity having a common central axis. The first terminal block includes: a first terminal table body protruding from one end wall of the skeleton in a direction of the central axis and having a first side surface facing away from the central axis; a plurality of first pin holes formed in the first terminal block body for mounting the terminal pins, the plurality of first pin holes extending substantially parallel to a radial direction of the winding space and the rotor cavity and opening at the first side surface; and a first limit portion protruding away from the central axis relative to the first side surface and having a first limit plane perpendicular to the extending direction of the first pin hole, for positioning a circuit board mounted to the stator frame assembly through the terminal pin in the extending direction of the first pin hole. The distance between the first limit plane and the first side surface is in the range of 0.5-2 mm.

For example, in some embodiments, the first stopper portion protrudes from the first side surface in the extending direction of the first pin hole.

For example, in some embodiments, the first terminal block further comprises a wire passing slot that is recessed in a direction toward the central axis to provide a wire passing space through which wires connected to the circuit board pass.

For example, in some embodiments, the wire guide groove has a groove bottom surface perpendicular to the extending direction of the first pin hole, and the distance between the groove bottom surface and the first limiting plane is in the range of 1.5-4 mm.

For example, in some embodiments, the first terminal block further includes a wall portion protruding in a direction of the central axis from a portion of the first terminal block body away from the central axis, the wire passing groove being at least partially formed in the wall portion.

For example, in some embodiments, the height of the first terminal table body protruding from the end wall in the direction of the central axis is in the range of 1.5-3.5mm, and the height of the wall portion protruding from the end wall in the direction of the central axis is in the range of 6.4-7.5 mm.

For example, in some embodiments, the length of the mating section of the pin hole for mating with the terminal pin is 2-9 times the diameter of the pin hole.

For example, in some embodiments, the length of the mating segment of the pin hole for mating with the terminal pin is in the range of 1.5-3.5 mm.

For example, in some embodiments, the pin holes have a hole diameter in the range of 0.4-0.7 mm.

For example, in some embodiments, the first terminal block further includes an exhaust hole communicating with the first pin hole, the exhaust hole extending in a different direction from the first pin hole and opening to an outside of the first terminal block.

For example, in some embodiments, the first pin holes have a length in the range of 2.5-4.5 mm.

For example, in some embodiments, the stator skeleton assembly further comprises: a first plate including a first plate-like body having an annular shape and a plurality of first pole claws bent from the first plate-like body and extending in a direction of a central axis; a second plate including an annular second plate-like body and a plurality of second pole claws bent from the second plate-like body and extending in the direction of the central axis; and a second terminal block. The second terminal station includes: a second terminal block body; a second pin hole formed in the second terminal block body and extending in parallel with the first pin hole; and a second stopper portion protruding from the second terminal block body and having a second stopper plane flush with the first stopper plane. The skeleton includes: a first bobbin section including a first proximal end wall adjacent to the first pole plate, a first distal end wall remote from the first pole plate, and a cylindrical first side wall, the first proximal end wall and the first distal end wall extending radially outward from both ends of the first side wall, respectively, such that a first winding space is formed between the first proximal end wall and the first distal end wall; and a second bobbin section including a second proximal end wall close to the second pole plate, a second distal end wall far from the second pole plate, and a second side wall in a cylindrical shape, the second proximal end wall and the second distal end wall extending radially outward from both ends of the second side wall, respectively, so that a second winding space is formed between the second proximal end wall and the second distal end wall, the winding space including the first winding space and the second winding space. Wherein the first proximal end wall, the first plate-like body, the second plate-like body and the second proximal end wall are stacked in sequence to form a rotor cavity, and the first plurality of prongs extends to an inner side of the first sidewall and the second plurality of prongs extends to an inner side of the second sidewall. The second terminal block body is connected between the first proximal end wall and the second proximal end wall and is located radially outward from the first plate-like body and the second plate-like body.

At least one embodiment of the present disclosure provides a stator assembly including a stator frame assembly, a terminal pin, and a circuit board as described above. The terminal pins are soldered to the circuit board.

At least one embodiment of the present disclosure provides a stator assembly including a stator frame assembly, a terminal pin, a circuit board, and a cover piece as described above. The terminal pins are soldered to the circuit board. The cover member covers the first terminal table from a side away from the rotor cavity. The cover member includes a cover wall abutting the wall portion in a direction of the central axis.

At least one embodiment of the present disclosure provides a stepping motor including the stator assembly as described above.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present disclosure, and therefore should not be considered as limiting the scope of protection, and for those skilled in the art, other related drawings may be obtained from the drawings without inventive effort.

Fig. 1 illustrates a perspective view of a stator backbone assembly according to an embodiment of the present disclosure;

fig. 2 illustrates another perspective view of a stator backbone assembly according to an embodiment of the present disclosure;

FIG. 3 illustrates a side view of a stator backbone assembly according to an embodiment of the present disclosure;

FIG. 4 illustrates a longitudinal cross-sectional view of a stator backbone assembly taken along a central axis and a plane of a pin hole according to an embodiment of the present disclosure;

FIG. 5 illustrates a perspective cross-sectional view of a first plate and a second plate in accordance with an embodiment of the disclosure;

fig. 6 illustrates a perspective view of a stator frame assembly and terminal pins mounted to the stator frame assembly according to an embodiment of the present disclosure;

fig. 7 illustrates a top view of a stator frame assembly and terminal pins mounted to the stator frame assembly according to an embodiment of the present disclosure;

fig. 8 illustrates a cross-sectional view of a stator frame assembly and terminal pins mounted to the stator frame assembly, taken along line Q-Q in fig. 7, in accordance with an embodiment of the present disclosure;

fig. 9 illustrates a perspective view of a stator bobbin assembly and terminal pins and circuit board mounted to the stator bobbin assembly according to an embodiment of the present disclosure;

fig. 10 illustrates an exploded perspective view of a stator frame assembly and terminal pins and circuit board mounted to the stator frame assembly and wires connected to the circuit board according to an embodiment of the present disclosure;

fig. 11 illustrates a cross-sectional view of a stator bobbin assembly and terminal pins and a circuit board mounted to the stator bobbin assembly and wires connected to the circuit board, wherein a first terminal block is provided with a wire passing slot, in accordance with an embodiment of the present disclosure;

fig. 12 illustrates a top view of a stator frame assembly and terminal pins and circuit boards and winding wires mounted to the stator frame assembly according to an embodiment of the present disclosure;

fig. 13 shows a top view of another stator frame assembly and terminal pins and circuit board and winding wire mounted to the stator frame assembly;

fig. 14 shows a cross-sectional view of another stator bobbin assembly and terminal pins and circuit board mounted to the stator bobbin assembly and wires connected to the circuit board, wherein the first terminal block is not provided with a wire passing slot;

FIG. 15 illustrates a cut-away perspective view of a stator skeleton assembly, a housing, and a cover piece according to an embodiment of the present disclosure;

FIG. 16 illustrates a cut-away plan view of a stator skeleton assembly, a housing and a cover piece according to an embodiment of the disclosure;

fig. 17 illustrates a perspective view of a stator backbone assembly according to another embodiment of the present disclosure;

fig. 18 shows a table illustrating the relationship between the drawing force of the pin holes of the stator bobbin assembly and the fitting length and the hole diameter of the pin holes according to an embodiment of the present disclosure;

fig. 19 shows a table illustrating a relationship between the distance of the restraining plane of the stator frame assembly from the corresponding side surface and the incidence of wire breakage of the winding wire; and is

Fig. 20 shows a table illustrating a relationship between a distance between a groove bottom surface of a wire passing groove of a stator bobbin assembly and a stopper plane and an occurrence rate of breakage of a winding wire.

List of reference numerals

First frame portion 110 wall 240

Third side surface 241 of the first distal end wall 111

First proximal end wall 112 catch wall 250

First sidewall 113 exhaust vent 260

First winding space 118 counterbore 270

Second frame portion 120 wire passage slot 280

Second distal wall 121 recess floor 281

Second proximal end wall 122 second terminal block 300

Second side wall 123 second terminal block body 310

Second side surface 311 of the second winding space 128

First plate 130 second pin hole 320

The second position-limiting part 330 of the first plate-like body 131

First pole claw 132 and second limit plane 331

Terminal pin 400 of second plate 140

Second plate-like body 141 circuit board 500

Second pole jaw 142 winding wire 600

First terminal block 200 wire 700

Second corresponding pole finger 810 of first terminal block body 210

First side surface 211 housing 820

Fourth side surface 212 cover piece 900

First pin hole 220 cover wall 910

The first position-limiting portion 230

First limit plane 231

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item preceding the word covers the element or item listed after the word and its equivalents, without excluding other elements or items. "upper", "lower", etc. are used merely to indicate a relative positional relationship, which may change when the absolute positional relationship of the object being described changes.

According to at least one embodiment of the present disclosure, a stator bobbin assembly is provided that includes a bobbin and a first terminal block. The bobbin provides a winding space in which a winding wire is wound and a rotor cavity having a common central axis. The first terminal table comprises a first terminal table body, a plurality of first pin holes and a first limiting part. The first terminal block body protrudes from one end wall of the skeleton in a direction of the central axis and has a first side surface facing away from the central axis. A plurality of first pin holes are formed in the first terminal block body for mounting the terminal pins. The plurality of first pin holes extend substantially parallel to the radial direction of the winding space and the rotor cavity and open to the first side surface. The first stopper portion protrudes away from the central axis with respect to the first side surface and has a first stopper plane perpendicular to an extending direction of the first pin hole for positioning a circuit board mounted to the stator frame assembly through the terminal pin in the extending direction of the first pin hole. The distance between the first limit plane and the first side surface is in the range of 0.5-2 mm.

The terminal pin is mounted to the stator frame assembly by being inserted into the first pin hole. Then, one end of the winding wire wound around the winding space is wound around the terminal pin. The connection portion of the winding wire between the terminal pin and the winding space is in a suspended and tensed state. In the case where the circuit board is mounted to the stator bobbin assembly through the terminal pins, the circuit board may contact and apply pressure to the winding wire, particularly, the connection portion of the winding wire, which may cause damage or disconnection of the winding wire. In the stator bobbin assembly according to the embodiment of the present disclosure, the first stopper plane of the first stopper portion restricts the position of the circuit board in the extending direction of the first pin hole (i.e., the mounting direction of the circuit board). Therefore, the pressure applied to the winding wire by the circuit board is well avoided or reduced, the damage or the disconnection of the winding wire is avoided, and the performance of the stator framework assembly is improved.

Fig. 1 and 2 show perspective views of a stator frame assembly according to an embodiment of the present disclosure, fig. 3 shows a side view of a stator frame assembly according to an embodiment of the present disclosure, and fig. 4 shows a longitudinal sectional view of a stator frame assembly according to an embodiment of the present disclosure, taken along the central axis L and the plane in which the pin holes 220, 320 are located. As shown in fig. 1 to 4, the stator frame assembly includes a frame, a first pole plate 130, a second pole plate 140, a first terminal block 200, and a second terminal block 300. The armature includes a first armature portion 110 and a second armature portion 120. The first backbone portion 110, the first plate 130, the second plate 140, and the second backbone portion 120 collectively form a rotor cavity V. For convenience and clarity in describing the stator frame assembly according to the present disclosure, an axial direction Z in which the central axis L is located, a first radial direction X perpendicular to the axial direction Z, and a second radial direction Y perpendicular to the axial direction Z and the first radial direction X are defined, and a rotor assembly cooperating with the stator assembly rotates about the central axis L in the rotor cavity V.

Fig. 5 illustrates a perspective cross-sectional view of the first plate 130 and the second plate 140, wherein the first plate 130 and the second plate 140 are stacked together, according to an embodiment of the present disclosure. The first plate 130 includes a ring-shaped first plate-like body 131 and a plurality of first pole claws 132. The plurality of first pole claws 132 are integrally bent from the first plate-like body 131 to extend in the axial direction Z. Similarly, the second plate 140 includes a second plate-like body 141 having an annular shape and a plurality of second claws 142. The plurality of second claws 142 are integrally bent from the second plate-like body 141 to extend in the axial direction Z. For example, first and

second claws

132 and 142, respectively, may be formed by bending a plate preform through a stamping process, and the plate preform may be formed through a blanking process.

As shown in fig. 5, the first plate-like body 131 of the first plate 130 and the second plate-like body 141 of the second plate 140 are stacked together to form an intermediate plane a between the first plate-like body 131 and the second plate-like body 141. The plurality of first pole pieces 132 are arranged at intervals around the center axis L, the plurality of second pole pieces 142 are arranged at intervals around the center axis L, and the first pole pieces 132 and the second pole pieces 142 are arranged to be staggered with each other in the circumferential direction. For convenience and clarity in describing the stator frame assembly according to the present disclosure, a direction toward medial plane a is defined as a proximal direction and a direction away from medial plane a is defined as a distal direction. The plurality of first and

second claws

132 and 142 extend from the first and second plate-

like bodies

131 and 141, respectively, toward the distal direction.

Returning to fig. 1-4, the first spine portion 110 includes a first proximal wall 112 proximate the medial plane a, a first distal wall 111 distal from the medial plane a, and a first sidewall 113 connecting the first proximal wall 112 and the first distal wall 111. The first side wall 113 is cylindrical, and the first proximal end wall 112 and the first distal end wall 111 extend radially outward from the first side wall 113 on the proximal side and the distal side of the first side wall 113, respectively, to form a first winding space 118 between the first proximal end wall 112 and the first distal end wall 111. The second spine portion 120 includes a second proximal wall 122 proximate the medial plane a, a second distal wall 121 distal from the medial plane a, and a second sidewall 123 connecting the second proximal wall 122 and the second distal wall 121. The second side wall 123 is cylindrical and the second proximal end wall 122 and the second distal end wall 121 extend radially outwardly from the second side wall 123 on proximal and distal sides of the second side wall 123, respectively, to form a second winding space 128 between the second proximal end wall 122 and the second distal end wall 121. The winding wire 600 may be wound around the first sidewall 113 in the first winding space 118 and may be wound around the second sidewall 123 in the second winding space 128.

The first proximal end wall 112, the first plate-like body 131, the second plate-like body 141 and the second proximal end wall 122 are stacked in order to form the rotor cavity V such that the plurality of first pole claws 132 extend to the inside of the first side wall 113 and the plurality of second pole claws 142 extend to the inside of the second side wall 123. Specifically, the first plurality of claws 132 may abut against an inner wall surface of the first sidewall 113 and the second plurality of claws 142 may abut against an inner wall surface of the second sidewall 123.

The first terminal block 200 includes a first terminal block body 210, a plurality of first pin holes 220 formed in the first terminal block body 210, a first stopper portion 230, and a wall portion 240. The first terminal block body 210 protrudes from the first distal end wall 111 of the first skeleton portion 110 in the direction of the central axis L (upward in the drawing) and has a first side surface 211 facing away from the central axis L. The plurality of first pin holes 220 extend substantially parallel to the radial direction and open to the first side surface 211. In the present example, the first pin holes 220 are 3 and arranged at uniform intervals. It is apparent that the first pin holes 220 may have other numbers and arrangements. For example, the first pin holes 220 may be greater than 3. For example, the first pin holes 220 may also be open at the fourth side surface 212 opposite to the first side surface 211 instead of blind holes. The first stopper portion 230 protrudes from the first side surface 211 in an extending direction of the first pin hole 220 and has a first stopper plane 231. The first stopper plane 231 is perpendicular to the extending direction of the first pin hole 220, and serves to position a circuit board 500 (to be described later) mounted to the stator bobbin assembly through the terminal pin 400 in the extending direction of the first pin hole 220. In this example, the first stopper portion 230 is cylindrical. Further, in this example, the first stopper portions 230 are 2 and are respectively provided on both sides of the plurality of first pin holes 220. Obviously, the first position limiting part 230 may have other numbers or positions, and the first position limiting part 230 may have other shapes. Further, the first stopper portion 230 may also protrude from other surfaces, such as a third side surface 241 of the wall portion 240 that faces away from the central axis L, which will be described later, as long as it has the first stopper plane 231 for positioning the circuit board 500 in the extending direction of the first pin hole 220, to which the present disclosure is not limited. In the present example, the height D2 of the first terminal block body 210 protruding from the first distal end wall 111 in the direction of the central axis L is in the range of 1.5-3.5mm, which ensures that the first terminal block body 210 has sufficient strength to avoid the terminal pins 400 from being displaced when the terminal pins 400 are inserted into the first pin holes 220. In this example, a fourth side surface 212 of the first terminal table body 210 opposite to the first side surface 211 is a plane. In other examples, a recess may be provided in the fourth side surface 212, which may help reduce material usage and reduce shrinkage. Fig. 17 illustrates a perspective view of a stator backbone assembly according to another embodiment of the present disclosure. As shown in fig. 17, the fourth side surface 212 may be serrated.

The wall portion 240 extends in the direction of the central axis L (upward in the drawing) from a portion of the first terminal table body 210 away from the central axis L. The wall portion 240 includes a third side surface 241 facing away from the central axis L. For example, the third side surface 241 is flush with the first side surface 211. The height D3 of the projection of the wall portion 240 from the first distal end wall 111 in the direction of the central axis L is in the range of 6.4-7.5 mm.

The second terminal block 300 includes a second terminal block body 310, a plurality of second pin holes 320 formed in the second terminal block body 310, and a second stopper 330. The second terminal block body 310 is connected between the first proximal end wall 112 and the second proximal end wall 122, and is located outside the first plate-like body 131 and the second plate-like body 141 in the radial direction. The second terminal block body 310 has a second side surface 311 facing away from the central axis L. For example, the second side surface 311 is flush with the first side surface 211. The second pin hole 320 extends parallel to the first pin hole 220 and opens at the second side surface 311. In this example, the number of the second pin holes 320 is 3, but is not limited thereto. The second stopper portion 330 protrudes from the second side surface 311 in the extending direction of the second pin hole 320 and has a second stopper plane 331. The second limit plane 331 is flush with the first limit plane 231. In this example, the second stopper portions 330 are 2 and are respectively disposed at both sides of the plurality of second pin holes 320, but the present disclosure is not limited thereto. It should be noted that in some other embodiments, the stator frame assembly may include only the first terminal block 200, only the second terminal block 300, or other terminal blocks other than the first terminal block 200 and the second terminal block 300.

Fig. 6 illustrates a perspective view of a stator frame assembly and terminal pins 400 mounted to the stator frame assembly according to an embodiment of the present disclosure. Fig. 7 illustrates a top view of a stator frame assembly and terminal pins 400 mounted to the stator frame assembly according to an embodiment of the present disclosure, and fig. 8 illustrates a cross-sectional view of a stator frame assembly and terminal pins 400 mounted to the stator frame assembly according to an embodiment of the present disclosure, taken along line Q-Q in fig. 7. As shown in fig. 6 to 8, the terminal pins 400 are mounted to the stator bobbin assembly by being inserted into the first and second pin holes 220 and 320 and extend from the first and second side surfaces 211 and 311 to the outside of the corresponding

terminal block bodies

210 and 310, respectively. Then, one end of the winding wire 600 (see fig. 12) wound around the winding space is wound around the portion of the terminal pin 400 extending to the outside of the

terminal block body

210, 310 and the winding wire 600 wound around the terminal pin 400 may be fixed to the terminal pin 400 by welding. It should be noted that in other embodiments, the terminal pins 400 may have other shapes and arrangements. For example, the terminal pin 400 may also extend from a fourth side surface 212 of the first terminal block 200 opposite to the first side surface 211 to the outside of the first terminal block body 210.

As shown in fig. 1, 2, 4, 7, and 8, the first terminal block body 210 may also be provided with a vent hole 260 and a counterbore 270 therein. The exhaust hole 260 communicates with the first pin hole 220, and extends to the outside of the first terminal block 200 in a different direction from the first pin hole 220, such as a direction parallel to the central axis L. In this example, the first pin hole 220 is a blind hole, and thus, when the terminal pin 400 is inserted into the first pin hole 220, air remaining in the first pin hole 220 will be compressed and not discharged, resulting in difficult insertion of the terminal pin 400, which will cause poor uniformity in the insertion depth of each terminal pin 400, affecting the winding of the winding wire 600. The air discharge hole 260 helps to discharge air when the terminal pin 400 is inserted into the first pin hole 220. In other examples, the second terminal block body 310 may be provided with the air vent 260.

The first terminal block body 210 of the stator bobbin assembly is also provided with a counterbore 270 disposed at the end of each first pin hole 220 in the first side surface 211. The depth of the counterbore 270 may be in the range of 0.2-0.5 mm. The counterbore 270 may have various shapes, such as square, circular, etc. In this example, the counterbore 270 is circular and has a diameter greater than the diameter of the first pin hole 220, for example in the range of 1-1.5 mm. In addition, the counterbore 270 may be provided with a rounded corner at the connection location with the pin hole to guide the insertion of the terminal pin 400. In addition, the end of each second pin hole 320 may also be provided with a counterbore 270.

In this example, the first pin hole 220 includes a counter-bore section, a mating section for mating with the terminal pin 400, and a vent section in communication with the vent hole 260. The length h4 of the mating segment may be 2-9 times the diameter of the first pin hole 220. For example, the first pin hole 220 may have a hole diameter in the range of 0.4-0.7 mm. For example, the length h4 of the mating segment may be in the range of 1.5-3.5 mm. For example, the total length h3 of the first pin hole 220 may be in the range of 2.5-4.5 mm. In addition, the length of the fitting section of the second pin hole 320 to be fitted with the terminal pin 400 may be 2 to 9 times the diameter of the second pin hole 320. For example, the second pin hole 320 may have a hole diameter in the range of 0.4-0.7 mm. For example, the length of the mating segment of the second pin hole 320 may be in the range of 1.5-3.5 mm. For example, the total length of the second pin holes 320 may be in the range of 2.5-4.5 mm. The aperture of the "pin hole" means the diameter of the pin hole 715 having a circular cross section, the diagonal distance of the pin hole 715 having a square cross section, and the maximum straight line distance of the cross section of the pin hole 715 having other cross sections.

Fig. 18 shows a table illustrating the relationship between the drawing force of the pin holes 220, 320 of the stator frame assembly and the mating segment length h4 and the bore diameter of the pin holes 220, 320 according to an embodiment of the present disclosure. As shown in the table in fig. 18, when the length h4 of the fitting section of the

pin hole

220, 320 and the hole diameter have such a size range, the drawing force is greater than 9.80N, and the requirement for the drawing force can be satisfied.

When the winding wire 600 is welded to the terminal block 400, heat generated by the welding is conducted to the terminal block body at the pin holes 220, 320 through the terminal block 400, and the hole diameters of the pin holes 220, 320 may become large at high temperature. Such a length of the mating section of the

pin hole

220, 320 allows a pulling resistance between the terminal pin 400 and the

pin hole

220, 320 to be well maintained in a space having a limited size, prevents the terminal pin 400 from being displaced by an external force, and improves a pulling-out force of the terminal pin 400. Furthermore, the inventors have recognized that when the length h4 of the mating segment of the pin holes 220, 320 is increased to some extent, for example, greater than 3.5mm, the pullout force will be reduced. This is contrary to the general knowledge of those skilled in the art. When the length h4 of the mating section of the

pin hole

220, 320 is greater than 3.5mm, the drawing force will be reduced because the terminal pin 800 will be bent and deformed when inserted into the

pin hole

220, 320.

Fig. 9 illustrates a perspective view of a stator frame assembly and terminal pins 400 and a circuit board 500 mounted to the stator frame assembly according to an embodiment of the present disclosure. Fig. 10 illustrates an exploded perspective view of a stator frame assembly and terminal pins 400 and a circuit board 500 mounted to the stator frame assembly and wires 700 connected to the circuit board 500 according to an embodiment of the present disclosure. Fig. 11 illustrates a cross-sectional view of a stator bobbin assembly and terminal pins 400 and a circuit board 500 mounted to the stator bobbin assembly and a wire 700 connected to the circuit board 500, wherein the first terminal block 200 is provided with a wire passing groove 280, according to an embodiment of the present disclosure. Fig. 11 is taken along the central axis L and the plane of the pin holes 220, 320. Fig. 12 illustrates a top view of the stator frame assembly and the terminal pins 400 and the circuit board 500 and the winding wire 600 mounted to the stator frame assembly according to an embodiment of the present disclosure. As shown in fig. 9 to 12, one end of the winding wire 600 wound in the winding space is wound to the terminal pin 400, the circuit board 500 is mounted to the stator frame assembly through the terminal pin 400, and the terminal pin 400 is mechanically and electrically connected to the circuit board 500. For example, the terminal pins 400 may be inserted into pin mounting holes in the circuit board 500 and fixed to the circuit board 500 by soldering. The first position-limiting plane 231 of the first position-limiting portion 230 and the second position-limiting plane 331 of the second position-limiting portion 330 abut against the circuit board 500 in the extending direction of the pin holes 220, 320, thereby positioning the circuit board 500 in that direction. Accordingly, the distance between the circuit board 500 and the first side surface 211 or the second side surface 311 is defined by the limiting

planes

231, 331.

Fig. 13 shows a top view of another stator frame assembly and the terminal pins 400 and the circuit board 500 and the winding wire 600 mounted to the stator frame assembly. As shown in fig. 13, the connection portion 610 of the winding wire 600 between the terminal pin 400 and the winding space is in a suspended and tensed state. In the case where the circuit board 500 is mounted to the stator bobbin assembly through the terminal pins 400, the circuit board 500 may contact the winding wire 600 and apply pressure to the winding wire 600, particularly, the connection portion 610 of the winding wire 600, which may cause damage or disconnection of the winding wire 600.

In the stator bobbin assembly according to the embodiment of the present disclosure, a distance between the circuit board 500 and the first side surface 211 or the second side surface 311 is defined by the first limit plane 231 and the second limit plane 331. The first and second limiting

planes

231 and 331 limit the position of the circuit board 500 in the extending direction of the pin holes 220 and 320. Therefore, the pressure applied to the winding wire 600 by the circuit board 500 is well prevented or reduced, the damage or disconnection of the winding wire 600 is prevented, and the performance of the stator bobbin assembly is improved. In the stator frame assembly according to the embodiment of the present disclosure, the distance h1 of the first stopper plane 231 from the first side surface 211 and the distance h 1' of the second stopper plane 331 from the second side surface 311 may be in the range of 0.5-2 mm. Such distances h1, h 1' are advantageous in preventing the winding wire 600 from being broken, avoiding deformation of the terminal pins 400, and reducing the volume of the stator bobbin assembly. Fig. 19 shows a table illustrating the relationship between the distances h1, h 1' of the limit planes 231, 331 of the stator bobbin assemblies from the corresponding side surfaces and the incidence of the breakage of the winding wire 600. As shown in fig. 19, when the distances h1, h 1' are too small, for example, less than 0.5mm, the winding wire 600 is likely to be broken. In addition, when the distances h1, h 1' are too large, for example, greater than 2mm, the length of the terminal pin 400 is long, and the distance that the terminal pin 400 protrudes from the pin holes 220, 320 is large, which may cause bending deformation of the terminal pin 400, which may affect the connection of the circuit board 500 and the terminal pin 400 and the drawing force of the terminal pin 400 in the pin holes 220, 320. In addition, setting the distances h1, h 1' to less than 2mm also contributes to reducing the volume of the stator-bobbin assembly and satisfying the limitation of the mounting size of the stepping motor.

In this example, the first stopper portion 230 and the second stopper portion 330 are both cylindrical in shape, and have a diameter h2 in the range of 0.5-3 mm. This ensures that the first and second

position limiting parts

230 and 330 have sufficient strength to position the circuit board 500.

In other examples, the first and second limiting

portions

230, 330 may be other shapes, and may have different shapes. In addition, the first and second

position limiting portions

230 and 330 may have other sizes.

Returning to fig. 2, 4, 6-11, the first terminal block 200 further includes a wire passing groove 280 formed in the first terminal block body 210 and the wall portion 240. The wire passing groove 280 is recessed from the first and third side surfaces 211 and 241 in a direction toward the central axis L to provide a wire passing space through which the electric wire 700 connected to the circuit board 500 passes. Fig. 14 shows a cross-sectional view of another stator bobbin assembly and terminal pins 400 and circuit board 500 mounted to the stator bobbin assembly and wires 700 connected to the circuit board 500, wherein the first terminal block 200 is not provided with the wire passing slots 280. As shown in fig. 14, the electric wire 700 protrudes from a side of the circuit board 500 close to the terminal block into a space between the circuit board 500 and the third side surface 241. Then, the electric wire 700 is bent to extend to the outside of the space. The electric wire 700 may displace the circuit board 500 away from the central axis L against the first terminal block 200, and will even cause loosening or detachment of the circuit board 500, or will cause the terminal pins 400 fixed to the circuit board 500 to detach from the pin holes 220, 320, thereby causing disconnection of the winding wire 600. Increasing the distance h1 between the first restriction plane 231 and the first side surface 211 and the distance h 1' between the second restriction plane 331 and the second side surface 311 helps to increase the wire passing space. In addition, the wire passing groove 280 is provided to help increase the wire passing space. In the present embodiment, the wire passing groove 280 has a groove bottom surface 281 perpendicular to the extending direction of the first pin hole 220, and a distance D1 between the groove bottom surface 281 and the first and second restriction planes 231 and 331 is in the range of 1.5-4 mm. Therefore, the wire passing distance is ensured in a limited space, and the undesirable phenomena of wire breakage of the winding wire 600, looseness of the circuit board 500 and the like are avoided. Fig. 20 shows a table illustrating the relationship between the distance D1 between the groove bottom surface 281 of the slot 280 of the stator frame assembly and the restriction planes 231, 331 and the occurrence rate of the breakage of the winding wire 600. As shown in fig. 20, when the distance D1 is less than 1.5, the winding wire 600 is likely to be broken. Further, in order to reduce the volume of the stator-bobbin assembly, the distance D1 is preferably less than 4mm in consideration of the limitation of the installation size of the stepping motor.

There is also provided in accordance with an embodiment of the present disclosure a stator assembly including the stator frame assembly as described above. Fig. 15 and 16 show a cut-away perspective view and a cut-away plan view, respectively, of a stator frame assembly, a housing 820, and a cover piece 900, according to an embodiment of the present disclosure. As shown in fig. 15 and 16, the stator assembly further includes a first corresponding pole plate (not shown) having a first plurality of corresponding pole fingers that mate with the first plurality of pole fingers, a second corresponding pole plate having a second plurality of corresponding pole fingers 810 that mate with the second plurality of pole fingers, and a shroud 900. The second corresponding pole plate may be integral with the housing 820 of the stepper motor. The cover 900 covers the first terminal block 200 and the second terminal block 300 from the side away from the rotor cavity. Further, the cover 900 includes a cover wall 910 that abuts the wall portion 240 in the direction of the central axis L. Therefore, the cover 900, the first terminal table body 210, and the second terminal table body 310 can well surround the space where the circuit board 500 is located, and foreign matters in the space can be prevented from entering the rotor cavity to affect the performance of the stepping motor. The first terminal block 200 is further provided with two snap walls 250 for snap fitting with the cover 900. The two catch walls 250 protrude toward the central axis L and toward the outside of the two sides, respectively, on the two sides of the fourth side surface 212 opposite to the first side surface 211.

There is also provided in accordance with an embodiment of the present disclosure a stepper motor including a stator assembly as described above or a stator frame assembly as described above. In addition, the stepper motor may further include a rotor assembly disposed in the rotor cavity, an output gear set, an output shaft assembly, and a housing.

Claims

1. A stator skeleton assembly, comprising:

a bobbin providing a winding space in which a winding wire is wound and a rotor cavity, the winding space and the rotor cavity having a common central axis; and

a first terminal station, comprising:

a first terminal table body protruding from one end wall of the skeleton in a direction of the central axis and having a first side surface facing away from the central axis;

a plurality of first pin holes formed in the first terminal block body for mounting terminal pins, the plurality of first pin holes extending substantially parallel to a radial direction of the winding space and the rotor cavity and opening at the first side surface; and

a first stopper portion that protrudes away from the central axis with respect to the first side surface and has a first stopper plane perpendicular to an extending direction of the first pin hole for positioning a circuit board mounted to the stator frame assembly through the terminal pin in the extending direction of the first pin hole,

the distance between the first limit plane and the first side surface is in the range of 0.5-2 mm.

2. The stator frame assembly of claim 1,

the first stopper portion protrudes from the first side surface in an extending direction of the first pin hole.

3. The stator frame assembly of claim 1,

the first terminal block further includes a wire passage slot recessed in a direction toward the central axis to provide a wire passage space through which an electric wire connected to the circuit board passes.

4. The stator frame assembly of claim 3,

the wire passing groove is provided with a groove bottom surface perpendicular to the extending direction of the first pin hole, and the distance between the groove bottom surface and the first limiting plane is within the range of 1.5-4 mm.

5. The stator frame assembly of any one of claims 3 or 4,

the first terminal block further includes a wall portion protruding in a direction of the central axis from a portion of the first terminal block body away from the central axis, the wire passage groove being at least partially formed in the wall portion.

6. The stator frame assembly of claim 5,

the first terminal table body protrudes from the end wall in the direction of the central axis by a height in a range of 1.5-3.5mm, and the wall portion protrudes from the end wall in the direction of the central axis by a height in a range of 6.4-7.5 mm.

7. The stator frame assembly of any one of claims 1-4,

the length of the matching section of the pin hole for matching with the terminal pin is 2-9 times of the aperture of the pin hole.

8. The stator frame assembly of any one of claims 1-4,

the length of the fitting section of the pin hole for fitting with the terminal pin is in the range of 1.5-3.5 mm.

9. The stator frame assembly of any one of claims 1-4,

the diameter of the pin hole is in the range of 0.4-0.7 mm.

10. The stator frame assembly of any one of claims 1-4,

the first terminal block further includes an exhaust hole communicating with the first pin hole, the exhaust hole extending in a different direction from the first pin hole and opening to an outer side of the first terminal block.

11. The stator frame assembly of claim 10,

the length of the first pin hole is in the range of 2.5-4.5 mm.

12. The stator frame assembly of any one of claims 1-4, further comprising:

a first plate including an annular first plate-like body and a plurality of first pole claws bent from the first plate-like body and extending in a direction of the central axis;

a second pole plate including an annular second plate-like body and a plurality of second pole claws bent from the second plate-like body and extending in the direction of the central axis; and

a second terminal station, comprising:

a second terminal block body;

a second pin hole formed in the second terminal block body and extending in parallel with the first pin hole; and

a second stopper portion protruding from the second terminal block body and having a second stopper plane flush with the first stopper plane,

wherein the skeleton comprises:

a first bobbin portion including a first proximal end wall proximate the first plate, a first distal end wall distal from the first plate, and a first cylindrical side wall, the first proximal end wall and the first distal end wall extending radially outward from both ends of the first side wall, respectively, such that a first winding space is formed between the first proximal end wall and the first distal end wall; and

a second bobbin section including a second proximal end wall near the second pole plate, a second distal end wall far from the second pole plate, and a second side wall in a cylindrical shape, the second proximal end wall and the second distal end wall extending radially outward from both ends of the second side wall, respectively, so that a second winding space is formed between the second proximal end wall and the second distal end wall, the winding space including the first winding space and the second winding space,

wherein the first proximal end wall, the first plate-like body, the second plate-like body and the second proximal end wall are stacked in sequence to form the rotor cavity, and the plurality of first pole fingers extend to an inner side of the first sidewall and the plurality of second pole fingers extend to an inner side of the second sidewall, and

wherein the second terminal block body is connected between the first proximal end wall and the second proximal end wall and is located outside from the first plate-like body and the second plate-like body in the radial direction.

13. A stator assembly comprising the stator frame assembly of any of claims 1-12, the terminal pins, and the circuit board, wherein the terminal pins are soldered to the circuit board.

14. A stator assembly comprising the stator frame assembly of claim 5 or 6, the terminal pins, the circuit board, and a cover, wherein,

the terminal pins are soldered to the circuit board,

the cover member covers the first terminal table from a side away from the rotor cavity, and

the cover includes a cover wall abutting the wall portion in the direction of the central axis.

15. A stepper motor comprising a stator assembly according to claim 13 or 14.