CN118413015B

CN118413015B - Stepping motor

Info

Publication number: CN118413015B
Application number: CN202410876375.8A
Authority: CN
Inventors: 毛路斌; 宋威; 章统
Original assignee: AAC Microtech Changzhou Co Ltd
Current assignee: AAC Microtech Changzhou Co Ltd
Priority date: 2024-07-02
Filing date: 2024-07-02
Publication date: 2024-10-01
Anticipated expiration: 2044-07-02
Also published as: CN118413015A

Abstract

The application relates to the technical field of motors, in particular to a stepping motor. The stepping motor of the embodiment of the application comprises a rotor assembly; the stator assembly comprises a fixed claw pole, a coil and a shell; the shell comprises a plurality of shell walls which are sequentially connected along the circumferential direction of the coil, at least one of the shell walls is configured as a first shell wall, and the outer wall of the first shell wall is formed with a hollowed-out part for avoiding the coil in a plane shape; in the above manner, at least one of the plurality of shell walls is set as the first shell wall, and since the first shell wall is formed with the hollowed-out part avoiding the coil, a part of the coil is accommodated in the hollowed-out part, and the dimension of the stepping motor in the direction perpendicular to the outer wall of the first shell wall can not comprise the thickness of the first shell wall, thereby being beneficial to realizing the miniaturization of the stepping motor; in addition, the outer wall of the first shell wall is planar, so that the planar surface is easy to be matched with other parts when the stepping motor is assembled, and the assembly difficulty of the stepping motor is reduced.

Description

Stepping motor

Technical Field

The application relates to the technical field of motors, in particular to a stepping motor.

Background

In the prior art, the cross section of the shell of the stepping motor is generally circular, and when the stepping motor is assembled into products such as electronic equipment, the size of the assembly space required to be provided for the stepping motor is limited by the diameter of the shell in width and thickness, so that the miniaturization of the products is not facilitated.

Accordingly, there is a need to provide a more miniaturized stepping motor to solve the above-mentioned technical problems.

Disclosure of Invention

The application aims to provide a stepping motor so as to solve the technical problem that the product miniaturization is not facilitated.

The technical scheme of the application is as follows: the embodiment of the application provides a stepping motor, which comprises:

the rotor assembly comprises a rotating shaft and magnetic steel sleeved outside the rotating shaft;

the stator assembly is sleeved outside the rotor assembly and comprises a fixed claw pole wound on the periphery of the rotor assembly, a coil sleeved outside the fixed claw pole and a shell sleeved on the coil;

the shell comprises a plurality of shell walls which are sequentially connected along the circumferential direction of the coil, at least one of the shell walls is configured as a first shell wall, the outer wall of the first shell wall is planar, the first shell wall is formed with a hollowed-out part for avoiding the coil, and a part of the coil is accommodated in the hollowed-out part.

The application has the beneficial effects that: the stepping motor comprises a rotor assembly, wherein the rotor assembly comprises a rotating shaft and magnetic steel sleeved outside the rotating shaft; the stator assembly is sleeved outside the rotor assembly and comprises a fixed claw pole wound on the periphery of the rotor assembly, a coil sleeved outside the fixed claw pole and a shell sleeved on the coil; the shell comprises a plurality of shell walls which are sequentially connected along the circumferential direction of the coil, at least one of the shell walls is configured as a first shell wall, the outer wall of the first shell wall is planar, the first shell wall is provided with a hollowed-out part for avoiding the coil, and a part of the coil is accommodated in the hollowed-out part; in the above manner, at least one of the plurality of shell walls is set as the first shell wall, and since the first shell wall is formed with the hollowed-out part avoiding the coil, a part of the coil is accommodated in the hollowed-out part, the dimension of the stepping motor in the direction perpendicular to the outer wall of the first shell wall can not comprise the thickness of the first shell wall, and the dimension of the stepping motor in the direction perpendicular to the outer wall of the first shell wall is reduced, thereby being beneficial to realizing miniaturization of the stepping motor; in addition, the outer wall of the first shell wall is planar, so that the planar surface is easy to be matched with other parts when the stepping motor is assembled, and the assembly difficulty of the stepping motor is reduced.

Drawings

Fig. 1 is a perspective view of a stepping motor according to an embodiment of the present application.

Fig. 2 is a front view of the stepper motor of fig. 1.

Fig. 3 is a cross-sectional view of the stepper motor of fig. 2 taken along A-A.

Fig. 4 is a schematic structural view of a stator assembly of the stepper motor shown in fig. 1.

Fig. 5 is a diagram showing the fit between the housing and the coil in the stepping motor shown in fig. 1.

Fig. 6 is an exploded view of the structure of the stepping motor shown in fig. 1.

Fig. 7 is a cross-sectional view of the stepper motor of fig. 2 taken along line B-B.

Fig. 8 is a partial structural sectional view of the stepping motor shown in fig. 6.

Fig. 9 is a schematic view of a structure of a fixed claw pole in the stepping motor shown in fig. 1.

Fig. 10 is a perspective view of a stepping motor according to an embodiment of the present application.

Fig. 11 is a perspective view of the stepper motor of fig. 10 from another perspective.

Fig. 12 is a schematic view of a stator assembly of the stepper motor of fig. 10.

Fig. 13 is an exploded view of the housing and coil of the stepper motor of fig. 10.

Fig. 14 is a diagram showing the fit between the housing and the coil in the stepping motor shown in fig. 10.

Fig. 15 is a perspective view of a stepper motor according to an embodiment of the present application.

Fig. 16 is a schematic view of the stator assembly of the stepper motor of fig. 15.

Fig. 17 is an exploded view of the housing and coil of the stepper motor of fig. 15.

Fig. 18 is a diagram showing the fit between the housing and the coil in the stepping motor shown in fig. 15.

Fig. 19 is a perspective view of a stepping motor according to an embodiment of the present application.

Fig. 20 is a schematic view of a stator assembly of the stepper motor of fig. 19.

Fig. 21 is an exploded view of the housing and coil of the stepper motor of fig. 19.

Fig. 22 is a diagram showing the fit of the housing and the coil in the stepping motor shown in fig. 19.

Fig. 23 is a perspective view of a stepper motor according to an embodiment of the present application.

Fig. 24 is a schematic view of the stator assembly of the stepper motor of fig. 23.

Fig. 25 is an exploded view of the stator assembly of the stepper motor of fig. 23.

Fig. 26 is a schematic diagram showing the cooperation of the fixed claw pole and the supporting leg assembly in the stepping motor shown in fig. 23.

Detailed Description

The application will be further described with reference to the drawings and embodiments.

It should be noted that the terms "first," "second," and "third," etc. in the description and claims of the present application and the above figures are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the term "include" and any variations thereof is intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

All directional indications (such as up, down, left, right, front, back, inside, outside, top, bottom … …) in embodiments of the present application are merely used to explain the relative positional relationship between the components, etc., at a particular pose (as shown in the figures), and if the particular pose changes, the directional indication changes accordingly. When an element is referred to as being "fixed" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

An embodiment of the present application provides a stepper motor, as shown in fig. 1-9, which includes a rotor assembly 10 and one or more stator assemblies 20.

Referring to fig. 3 and 6, the rotor assembly 10 includes a rotating shaft 101 and a magnetic steel 102, the magnetic steel 102 is sleeved outside the rotating shaft 101, and the magnetic steel 102 and the rotating shaft 101 can integrally rotate. The magnetic steel 102 may be cylindrical.

In fig. 1 and fig. 6 to fig. 8, a plurality of stator assemblies 20 are taken as an example, four stator assemblies 20 are sequentially stacked and arranged along an axial direction of the rotor assembly 10, each stator assembly 20 is sleeved outside the rotor assembly 10, specifically, the stator assemblies 20 are sleeved outside the magnetic steel 102 at intervals, the stator assemblies 20 comprise a housing 201, a coil 202 and a fixed claw pole 20a, the fixed claw pole 20a is wound on the periphery of the rotor assembly 10, the coil 202 is sleeved and fixed on the fixed claw pole 20a, and the housing 201 is sleeved outside the coil 202.

As shown in fig. 3,4 and 5, the housing 201 includes a plurality of housing walls 201a sequentially connected along a circumferential direction of the coil 202, at least one of the plurality of housing walls 201a is configured as a first housing wall 2011, an outer wall of the first housing wall 2011 is planar, the first housing wall 2011 is formed with a hollowed portion 211, the hollowed portion 211 is used for avoiding the coil 202, and a portion of the coil 202 is accommodated in the hollowed portion 211.

Wherein, a plurality of shell walls 201a enclose and form and hold the chamber 201b, and the inner wall of a plurality of shell walls 201a connects gradually and forms the inner wall that holds the chamber 201b, and the shape of the inner wall that holds the chamber 201b matches with the shape of the outer wall of coil 202.

In this embodiment, by providing at least one of the plurality of case walls as the first case wall, since the first case wall is formed with the hollowed portion where the coil is avoided, a part of the coil is accommodated in the hollowed portion, the size of the stepping motor in the direction S1 perpendicular to the outer wall of the first case wall may not include the thickness of the first case wall, and the size of the stepping motor in the direction S1 perpendicular to the outer wall of the first case wall is reduced, which is advantageous in achieving miniaturization of the stepping motor; in addition, the outer wall of the first shell wall is planar, so that the planar surface is easy to be matched with other parts when the stepping motor is assembled, and the assembly difficulty of the stepping motor is reduced.

As an embodiment, referring to fig. 12 to 14, a portion of the coil 202 accommodated in the hollowed portion 211 is formed with a first plane 2021 parallel to an outer wall of the first housing wall 2011, and the first plane 2021 is located on the outer wall of the coil 202. In the present embodiment, the outer wall of the portion of the coil located in the hollowed portion is processed into a planar shape, and the dimension in the direction S1 perpendicular to the outer wall of the first housing wall is further reduced compared with the arcuate surface before processing, which is advantageous for realizing miniaturization of the stepping motor; or the saved space can be used for increasing the number of turns of the coil or increasing the thickness of the claw pole or increasing the size of the magnetic steel so as to further improve the torque performance.

As an embodiment, referring to fig. 10 to 14, two of the plurality of housing walls 201a are configured as first housing walls 2011, and the two first housing walls 2011 are disposed opposite to each other. In this embodiment, two opposite first housing walls are provided in the same direction, and the dimension in the direction S1 perpendicular to the outer walls of the first housing walls may not include the thicknesses of the two first housing walls, which is advantageous for further achieving miniaturization of the stepping motor.

As an embodiment, referring to fig. 15 to 18 and fig. 19 to 22, at least one of the plurality of housing walls 201a is configured as a second housing wall 2012, and an outer wall of the second housing wall 2012 is planar. The second housing wall 2012 is not provided with a hollowed out portion, and the inner wall of the second housing wall 2012 may be arc-shaped or have other shapes which are adapted to the shape of the outer wall of the coil 202. In this embodiment, the outer wall is planar second shell wall and is convenient for other electronic devices and stepper motor laminating, need not to set up other bearing structure or connection structure, is favorable to further realizing stepper motor's miniaturization.

In some embodiments, referring to fig. 15 and 19, the stepper motor of the present embodiment further includes a circuit board 30, and the circuit board 30 may be fixed on any of the second housing walls 2012. In this embodiment, the circuit board 30 is more easily attached to the second housing wall having the outer wall in a planar shape, and the circuit board can be fixed without providing pins, which is advantageous for further realizing miniaturization of the stepper motor. Illustratively, in this embodiment, the outgoing line of the coil 202 may be spot-welded with the circuit board by using a lead wire, and the outgoing line of the circuit board is not required to be cut off on the second housing wall, so as to improve the structural strength of the stepper motor.

As an embodiment, referring to fig. 19 to 22 and fig. 23 to 24, at least one of the plurality of shell walls 201a is configured as a third shell wall 2013, an outer wall of the third shell wall 2013 is an arc surface, and a cross section of the outer wall of the third shell wall 2013 is an arc shape protruding in a direction away from the rotation shaft 101. In this embodiment, through setting up the outer wall to the third shell wall of arcwall face, be applicable to the application scenario that needs to adopt the arcwall face to carry out the complex.

In some embodiments, referring to fig. 23 to 26, the stepper motor of the present embodiment further includes a circuit board 30, the circuit board 30 may be disposed opposite to any of the third casing walls 2013, the stator assembly 20 further includes a supporting leg assembly 205, the supporting leg assembly 205 includes a supporting framework 2051 stacked on the coil 202 along the axial direction of the rotor assembly 10, and supporting legs 2052 extending from the supporting framework 2051 in a direction away from the rotating shaft 101, the third casing wall 2013 disposed opposite to the circuit board 30 is provided with avoiding holes 212, and the supporting legs 2052 extend out of the casing 201 through the avoiding holes 212 and are fixedly connected with the circuit board 30. In this embodiment, the wiring board is disposed at the opposite position of any third casing wall, so that the wiring board wire-outgoing mode in the background technology can be adapted, and the universality of the stepper motor of this embodiment is enhanced.

In some embodiments, referring to fig. 23-25, the first housing wall 2011 is entirely hollowed out, and the hollowed out portion 211 extends along the entire first housing wall 2011.

In some embodiments, referring to fig. 24 and 25, the housing 201 includes four housing walls 201a; two of the four housing walls 201a are configured as first housing walls 2011 (hollowed out portions 211), and the two first housing walls 2011 (hollowed out portions 211) are disposed opposite to each other; two of the four housing walls 201a are configured as third housing walls 2013, and the two third housing walls 2013 are disposed opposite to each other.

As one embodiment, the cross section of the housing 201 is rectangular, and the housing 201 includes four housing walls 201a; the four housing walls 201a may include a first number of first housing walls and a second number of second housing walls, wherein the first number is n1, the second number is n2, n1 and n2 are natural numbers, respectively, and the sum of n1 and n2 is 4. In the present embodiment, by setting the cross section of the housing 201 to be rectangular, flattening of the stepping motor is advantageously achieved to reduce the size.

In some embodiments, referring to fig. 3 to 5, two of the four housing walls 201a are configured as first housing walls 2011, and the two first housing walls 2011 are disposed opposite to each other in the width direction of the stepper motor; two of the four housing walls 201a are configured as second housing walls 2012, and the two second housing walls 2012 are disposed opposite to each other in the length direction of the stepping motor. The height direction of the stepping motor is the axial direction of the rotation shaft 101. In this embodiment, the width of the stepper motor is the diameter of the coil 202, which is beneficial to miniaturization of the product, and the two second housing walls in the length direction are not provided with hollowed-out portions, which is beneficial to increasing the structural strength of the product.

In some embodiments, referring to fig. 16-18, four housing walls 201a include a first housing wall 2011 and three second housing walls 2012. The first housing wall 2011 and one of the second housing walls 2012 are disposed opposite to each other in the width direction of the stepper motor, and the other two second housing walls 2012 are disposed opposite to each other in the length direction of the stepper motor. The height direction of the stepping motor is the axial direction of the rotation shaft 101. In this embodiment, the first casing wall is disposed in the width direction, which is advantageous for reducing the size in the width direction to miniaturize the product, and the two second casing walls in the length direction and one second casing wall in the width direction are not provided with the hollowed-out portion, which is advantageous for increasing the structural strength of the product.

As one embodiment, the housing 201 includes four housing walls 201a; the four case walls 201a may include m1 first case walls, m2 second case walls, and m3 third case walls, wherein m1, m2, and m3 are natural numbers, respectively, and the sum of m1, m2, and m3 is 4.

In some embodiments, the housing 201 includes, in order in the circumferential direction of the coil 202, a first housing wall 2011, a first second housing wall 2012 connected to the first housing wall 2011, a second housing wall 2012 connected to the first second housing wall 2012, and a third housing wall 2013 connecting the second housing wall 2012 and the first housing wall 2011.

In some embodiments, the housing 201 includes, in order along the circumferential direction of the coil 202, a first housing wall 2011, a first second housing wall 2012 connected to the first housing wall 2011, a third housing wall 2013 connected to the first second housing wall 2012, and a second housing wall 2012 connecting the first housing wall 2011 and the third housing wall 2013, the two second housing walls 2012 being disposed opposite each other, the first housing wall 2011 and the third housing wall 2013 being disposed opposite each other.

In some embodiments, referring to fig. 12 to 14, the housing 201 includes, in order along the circumferential direction of the coil 202, a first housing wall 2011, a second housing wall 2012 connected to the first housing wall 2011, a second first housing wall 2011 connected to the second housing wall 2012, and a third housing wall 2013 connecting the two first housing walls 2011, the two first housing walls 2011 being disposed opposite to each other, the second housing wall 2012 and the third housing wall 2013 being disposed opposite to each other.

In some embodiments, referring to fig. 20-22, the housing 201 includes five housing walls 201a; the housing 201 includes, in order in the circumferential direction of the coil 202, a first housing wall 2011, a first second housing wall 2012 connected to the first housing wall 2011, a second housing wall 2012 connected to the first second housing wall 2012, a third housing wall 2013 connected to the second housing wall 2012, and a third second housing wall 2012 connecting the third housing wall 2013 and the first housing wall 2011, the first housing wall 2011 and the second housing wall 2012 being disposed opposite to each other, the first second housing wall 2012 and the third second housing wall 2012 being disposed opposite to each other.

As an embodiment, referring to fig. 7 to 9, the fixed claw-pole 20a includes a first claw-pole portion 203 and a second claw-pole portion 204 which are disposed opposite to each other and cooperate with each other. The first claw-pole portion 203 comprises a first base 2031 sleeved on the rotating shaft 101 and first pole claws 2032 bent and extended from the edge of the first base 2031 towards the second claw-pole portion 204 along the axial direction of the rotating shaft 101, and the first pole claws 2032 are distributed at intervals along the circumferential direction of the first base 2031; the second claw-pole portion 204 includes a second base 2041 sleeved on the rotating shaft 101 and second claws 2042 bent and extended from the edge of the second base 2041 toward the first base 2031 along the axial direction of the rotating shaft 101, and the second claws 2042 are distributed at intervals along the axial direction of the second base 2041; the first pole claws 2032 and the second pole claws 2042 extend in a staggered manner, each first pole claw 2032 is located between two adjacent second pole claws 2042, the first pole claws 2032 and the second pole claws 2042 enclose a pole claw ring 20b, and the coil 202 is sleeved on the pole claw ring 20 b.

In some embodiments, referring to fig. 9 and 26, a plurality of first pole claws 2032 are uniformly distributed on the inner periphery of the first base 2031, and a space is provided between two adjacent first pole claws 2032; the plurality of second claws 2042 are uniformly distributed on the inner periphery of the second base 2041, and a space is reserved between two adjacent second claws 2042; when the coil 202 is sleeved on the pole claw ring 20b, the coil 202 is positioned between the first base 2031 and the second base 2041; when the housing 201 is fitted over the coil 202, the outer peripheral edge of the first base 2031 and the outer peripheral edge of the second base 2041 are respectively abutted against the inner wall of the housing 201.

In some embodiments, referring to fig. 6, the outer surface of the magnetic steel 102 is formed with a plurality of first magnetic poles 1021 and a plurality of second magnetic poles 1022 which are staggered along the circumferential direction of the magnetic steel 102, and the first magnetic poles 1021 and the second magnetic poles 1022 are opposite in magnetic property, for example, one is an N pole and the other is an S pole.

In some embodiments, referring to fig. 9, when the first claw-pole portion 203 and the second claw-pole portion 204 are engaged with each other, the first poles 2032 of the first claw-pole portion 203 and the second poles 2042 of the second claw-pole portion 204 are disposed to be interposed with each other, that is, the second poles 2042 are located in a space region between two adjacent first poles 2032, and the first poles 2032 and the second poles 2042 are disposed corresponding to the first magnetic pole 1021 or the second magnetic pole 1022 of the magnetic steel. For the same stator assembly 20, the first pole claw 2032 and the second pole claw 2042 are opposite in magnetic properties, e.g., one is an N pole and the other is an S pole. Further, the first pole claw 2032 and the second pole claw 2042 are disposed at equal intervals, and the widths of the first pole claw 2032 and the second pole claw 2042 are gradually reduced along the respective extending directions.

In some embodiments, referring to fig. 3, 7 and 8, a cylindrical glue layer 206 is further disposed between the pole claw ring 20b and the coil 202.

With continued reference to fig. 3 and fig. 7 to fig. 8, the stepper motor further includes a support assembly 40, wherein the two support assemblies 40 are respectively disposed at two ends of the rotor assembly 10, and referring to fig. 3, fig. 4 and fig. 5, the support assembly 40 includes an end cover 401 and a bearing 402, the end cover 401 is connected with the rotating shaft 101 through the bearing 402, and the rotating shaft 101 can rotate relative to the end cover 401.

Further, the top and the bottom of the magnetic steel 102 are respectively provided with a gasket 103, the gasket 103 is annular and sleeved on the rotating shaft 101, and the gasket 103 is positioned between the magnetic steel 102 and the bearing 402.

While the application has been described with respect to the above embodiments, it should be noted that modifications can be made by those skilled in the art without departing from the inventive concept, and these are all within the scope of the application.

Claims

1. A stepping motor, comprising:

The stator assembly is sleeved outside the rotor assembly and comprises a fixed claw pole wound on the periphery of the rotor assembly, a coil sleeved outside the fixed claw pole and a shell sleeved on the coil; the fixed claw pole comprises a first claw pole part and a second claw pole part which are oppositely arranged and mutually matched, the first claw pole part comprises a first base sleeved on the rotating shaft and first pole claws which are bent and extended from the edge of the first base towards the second claw pole part along the axial direction of the rotating shaft, and the first pole claws are distributed at intervals along the circumferential direction of the first base; the second claw pole part comprises a second base sleeved on the rotating shaft and second claws which are bent and extended from the edge of the second base towards the first base along the axial direction of the rotating shaft, and the second claws are distributed at intervals along the axial direction of the second base; the first pole claws and the second pole claws extend in a staggered manner, each first pole claw is positioned between two adjacent second pole claws, the first pole claws and the second pole claws enclose a pole claw ring, and the coil is sleeved on the periphery of the pole claw ring;

when the shell is sleeved on the coil, the outer periphery of the first base and the outer periphery of the second base are respectively abutted with the inner wall of the shell;

The shell comprises a plurality of shell walls which are sequentially connected along the circumferential direction of the coil, wherein two of the plurality of shell walls are configured as a first shell wall, at least one of the plurality of shell walls is configured as a second shell wall, at least one of the plurality of shell walls is configured as a third shell wall, and the two first shell walls are oppositely arranged;

The outer wall of the first shell wall is planar, a hollowed-out part for avoiding the coil is formed on the first shell wall, a part of the coil is accommodated in the hollowed-out part, and a first plane parallel to the outer wall of the first shell wall is formed on the part of the coil accommodated in the hollowed-out part; the outer wall of the second shell wall is planar; the outer wall of the third shell wall is an arc-shaped surface.

2. The stepper motor of claim 1, further comprising a circuit board secured to the exterior of the housing, the circuit board being secured to any of the second housing walls.

3. The stepping motor according to claim 1, further comprising a circuit board fixed outside the housing, wherein the circuit board is disposed opposite to any one of the third housing walls, the stator assembly further comprises a supporting leg assembly, the supporting leg assembly comprises a supporting framework stacked on the coil along an axial direction of the rotor assembly, and supporting legs extending from the supporting framework in a direction away from the rotating shaft, avoidance holes are formed in the third housing wall disposed opposite to the circuit board, and the supporting legs extend out of the housing through the avoidance holes and are fixedly connected with the circuit board.

4. The stepper motor of claim 1, wherein the housing comprises four of the housing walls; the shell sequentially comprises a first shell wall, a second shell wall connected with the first shell wall, a second first shell wall connected with the second shell wall and a third shell wall connected with the two first shell walls along the circumferential direction of the coil, wherein the second shell wall and the third shell wall are oppositely arranged.

5. The stepping motor according to any one of claims 1 to 4, wherein the stepping motor comprises a plurality of stator modules and a plurality of housings respectively fitted over the plurality of stator modules, the plurality of stator modules being sequentially stacked in the axial direction of the rotor module, the plurality of housings being sequentially stacked in the axial direction of the rotor module.