Stepper electric motor

Abstract

The present application belongs to the technical field of electric motors. Disclosed is a stepper electric motor, comprising a rotor assembly comprising a rotating shaft and a plurality of magnetic steels arranged in the circumferential direction of the rotating shaft; and a stator assembly or a plurality of stator assemblies stacked in sequence in the axial direction of the rotor assembly, wherein the stator assembly is sleeved outside the rotor assembly, and comprises a claw pole assembly arranged around the periphery of the rotor assembly, a plurality of solenoids arranged in sequence in the circumferential direction of the claw pole assembly, and a housing for accommodating the claw pole assembly and the plurality of solenoids, each solenoid comprising a core and a coil wound around the core, and the winding central axis of the coil extending in the radial direction of the rotating shaft. The present application achieves the technical effects of reducing the radial size of the electric motor, facilitating the thinning and lightening of the electric motor, and improving the torque performance of the electric motor.

Description

Stepping motor TECHNICAL FIELD

[0001] The application belongs to the technical field of electric machines, and particularly relates to a stepping motor. BACKGROUND

[0002] An electric machine is an electromagnetic device for converting or transmitting electric energy, mainly composed of a stator and a rotor. As a special electric machine, a stepping motor belongs to a control motor and is an electric motor for converting an electric pulse signal into corresponding angular displacement or linear displacement. At present, in the stepping motor technology, the axis of the coil located in the electric machine is coaxial with the axis of the electric machine, but the radial dimension of the electric machine is limited by the coil wall thickness, the claw pole thickness and the magnet thickness, so that it is difficult to reduce the radial dimension of the electric machine, which is not conducive to the light and thin realization of the electric machine.

[0003] Therefore, it is necessary to provide a new technical scheme to solve the above technical problems. TECHNICAL PROBLEM

[0004] The technical problem to be solved by the application is the technical problem that it is difficult to reduce the radial dimension of the electric machine, which is not conducive to the light and thin realization of the electric machine. TECHNICAL SOLUTION

[0005] To solve the above technical problems, the application provides a stepping motor, which comprises: a rotor assembly, the rotor assembly comprising a rotating shaft and a plurality of magnet steel arranged around the circumference of the rotating shaft; one stator assembly or a plurality of stator assemblies arranged in sequence along the axial direction of the rotor assembly, the stator assembly being sleeved outside the rotor assembly, the stator assembly comprising a claw pole assembly arranged around the outer periphery of the rotor assembly, a plurality of solenoids arranged in sequence along the circumference of the claw pole assembly, and a housing for accommodating the claw pole assembly and the plurality of solenoids, the solenoid comprising an iron core and a coil wound around the iron core, the winding center axis of the coil extending along the radial direction of the rotating shaft.

[0006] Optionally, the solenoid further comprises an iron core and a coil sleeved on the iron core, the claw pole assembly comprises a first claw pole part arranged around the outer periphery of the rotor assembly and a second claw pole part arranged around the outer periphery of the rotor assembly, the first claw pole part is provided with two, the second claw pole part is arranged between the two first claw pole parts, and the first claw pole part is connected with the housing; the iron core comprises a first end in contact with the second claw pole part and a second end in contact with the inner wall of the housing.

[0007] Optionally, the shell comprises a top shell and a bottom shell arranged oppositely, and a side shell connecting the top shell and the bottom shell, the top shell is provided with a top center hole for the rotor assembly to pass through, the bottom shell is provided with a bottom center hole for the rotor assembly to pass through, one of the first claw pole parts is connected with the inner periphery of the top center hole, and the other first claw pole part is connected with the inner periphery of the bottom center hole.

[0008] Optionally, the number of the solenoids is two, and the two solenoids are arranged in axial symmetry with respect to the rotating shaft.

[0009] Optionally, the side shell comprises a first side shell and a second side shell arranged oppositely, one of the solenoids is connected with the first side shell, and the other solenoid is connected with the second side shell; the outer wall of the first side shell and the outer wall of the second side shell are respectively a plane or an arc surface.

[0010] Optionally, the inner wall of the coil close to the claw pole assembly and the outer wall of the coil close to the side shell are respectively an arc surface, and the center line of the inner wall of the coil close to the claw pole assembly and the center line of the outer wall of the coil close to the side shell are respectively parallel to the rotating shaft; or the inner wall of the coil close to the claw pole assembly and the outer wall of the coil close to the side shell are respectively a plane.

[0011] Optionally, the solenoids are provided with at least three, and the at least three solenoids are uniformly arranged along the circumference of the claw pole assembly.

[0012] Optionally, the side shell is in a cylindrical shape.

[0013] Optionally, the first claw pole part comprises a plurality of first claw poles, the second claw pole part comprises a plurality of second claw poles arranged on a support body sleeved on the rotor assembly, and the support body is connected with the core of the solenoid, each of the first claw poles is located between two adjacent second claw poles, and the plurality of first claw poles and the plurality of second claw poles form a claw pole ring, and the plurality of solenoids are located at the outer periphery of the claw pole ring.

[0014] Optionally, the first claw pole is tapered in the direction close to the support body; the second claw pole is tapered in the direction away from the support body; the first claw pole comprises a connecting section and an extension section bent and extended from the connecting section towards the direction close to the magnetic steel. Advantages

[0015] The application provides a kind of step motor, by the circumferential arrangement of multiple magnetic steel around the axis of rotation in rotor assembly, one stator assembly or multiple stator assemblies are sequentially stacked along the axial direction of rotor assembly, stator assembly is sleeved on the outer periphery of rotor assembly, claw pole assembly in stator assembly is arranged around the outer periphery of rotor assembly, multiple solenoids are sequentially arranged along the circumferential direction of claw pole assembly, shell is used to accommodate claw pole assembly and multiple solenoids, coil is wound on the core in solenoid, and the winding center axis of coil extends along the radial direction of rotation axis. Thus, the center axis of coil is arranged as the same as the radial direction of rotation axis, so that the thickness space occupied by coil in radial direction is greatly reduced, the radial dimension of motor can be reduced, which is beneficial to realize the light and thin of motor, and the width of coil can be adjusted, the coil is arranged by flattening, the width space of motor is fully utilized, which is beneficial to realize the improvement of motor torque performance. Thus, the radial dimension of motor can be reduced, which is beneficial to realize the light and thin of motor, and the torque performance of motor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative effort.

[0017] Fig. 1 is a structural schematic view of a step motor provided by an embodiment of the present application.

[0018] Fig. 2 is a structural schematic view of a shell in a step motor provided by an embodiment of the present application.

[0019] Fig. 3 is a top view of Fig. 2.

[0020] Fig. 4 is a sectional view of Fig. 3 along A-A.

[0021] Fig. 5 is a structural schematic view of a coil in a step motor provided by an embodiment of the present application.

[0022] Fig. 6 is a side view of Fig. 5.

[0023] Fig. 7 is a sectional view of Fig. 6 along B-B.

[0024] Fig. 8 is a sectional view of part of an assembly in a step motor provided by an embodiment of the present application.

[0025] Fig. 9 is a structural schematic view of a rotation axis in a step motor provided by an embodiment of the present application.

[0026] Fig. 10 is a sectional view of Fig. 9 along C-C. Embodiments of the present application

[0027] The embodiments of the present application will be described in detail below with reference to the drawings, in which the same or similar components have the same reference numerals throughout the several views. The embodiments described below are exemplary only, and are not intended to be limiting of the present application.

[0028] In order to make the persons skilled in the art better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the person skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] In the embodiments of the present application, at least one refers to one or more; multiple refers to two or more than two. In the description of the present application, the terms "first", "second", "third" and the like are only used for distinguishing the purposes of description, and cannot be understood as indicating or implying relative importance, nor can be understood as indicating or implying order.

[0030] In the present specification, the reference "one embodiment" or "some embodiments" and the like means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Therefore, the terms "include", "contain", "have" and their variants in the present specification mean "include but not limited to", unless otherwise specifically emphasized. It should be noted that in the embodiments of the present application, the "and / or" description of the associated objects means that there can be three relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone.

[0031] It should be noted that in the embodiments of the present application, when a component is referred to as "fixed to" another component, it can be directly on the other component or there can be a middle component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there can be a middle component. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there can be a middle component. At the same time, "connection" in the embodiments of the present application can also be understood as electrical connection, and the connection between two electrical elements can be direct or indirect connection between the two electrical elements. For example, A and B are connected, which can be direct connection between A and B, or indirect connection between A and B through one or more other electrical elements. The terms "vertical", "horizontal", "left", "right" and the like used in the embodiments of the present application are only for illustrative purposes, and are not intended to limit the present application.

[0032] The step motor provided by the embodiment of the application, please refer to the structure schematic diagram of the step motor provided by the embodiment of the application shown in FIG. 1 to FIG. 10, FIG. 1 is the structure schematic diagram of the step motor provided by the embodiment of the application, FIG. 2 is the structure schematic diagram of the shell 23 in the step motor provided by the embodiment of the application, FIG. 3 is the top view of FIG. 2, FIG. 4 is the section view of FIG. 3 in A-A direction, FIG. 5 is the structure schematic diagram of the coil 222 in the step motor provided by the embodiment of the application, FIG. 6 is the side view of FIG. 5, FIG. 7 is the section view of FIG. 6 in B-B direction, FIG. 8 is the section view of part of the assembly in the step motor provided by the embodiment of the application, FIG. 9 is the structure schematic diagram of the rotating shaft 11 in the step motor provided by the embodiment of the application, FIG. 10 is the section view of FIG. 9 in C-C direction. The step motor provided by the embodiment of the application comprises a rotor assembly 1 and a stator assembly or a plurality of stator assemblies which are arranged in sequence along the axial direction of the rotor assembly 1, the stator assembly is sleeved on the outer periphery of the rotor assembly 1, the stator assembly comprises a claw pole assembly 21, a plurality of solenoids 22 and a shell 23, the claw pole assembly 21 is arranged around the outer periphery of the rotor assembly 1, the plurality of solenoids 22 are arranged in sequence along the circumferential direction of the claw pole assembly 21, the shell 23 is used for accommodating the claw pole assembly 21 and the plurality of solenoids 22, the solenoid 22 comprises an iron core 221 and a coil 222, the coil 222 is wound on the iron core 221, and the winding center axis of the coil 222 extends along the radial direction of the rotating shaft 11.

[0033] The inside of the shell 23 has a space for accommodating the plurality of magnetic steels 12, the claw pole assembly 21 and the plurality of solenoids 22, the plurality of magnetic steels 12 can be 2 magnetic steels 12, 3 magnetic steels 12, 4 magnetic steels 12, 5 magnetic steels 12, 6 magnetic steels 12, etc., when the number of the magnetic steels 12 is 6, the 6 magnetic steels 12 are symmetrically distributed around the rotating shaft 11, the 6 magnetic steels 12 are spliced to form a whole cylinder, and the rotating shaft 11 penetrates the center of the cylinder.

[0034] The magnetic properties of the end of each magnetic steel 12 away from the rotating shaft 11 and the end close to the rotating shaft 11 are opposite, for example, the magnetic pole of the end of one magnetic steel 12 close to the rotating shaft 11 is N pole, and the magnetic pole of the other end of the magnetic steel 12 away from the rotating shaft 11 is S pole. In addition, the magnetic properties of the ends of two adjacent magnetic steels 12 close to the rotating shaft 11 are opposite, for example, the magnetic pole of the end of one magnetic steel 12 close to the rotating shaft 11 is N pole, and the magnetic pole of the end of the other magnetic steel 12 close to the rotating shaft 11 adjacent to the magnetic steel 12 is S pole. The magnetic properties of the other ends of the two adjacent magnetic steels 12 are opposite, for example, the magnetic pole of the end of one magnetic steel 12 away from the rotating shaft 11 is S pole, and the magnetic pole of the end of the other magnetic steel 12 away from the rotating shaft 11 adjacent to the magnetic steel 12 is N pole. The winding center axis of the coil 222 is the vertical direction shown in FIG. 5, the radial direction of the rotating shaft 11 is the vertical direction shown in FIG. 6, and the radial direction of the motor is the same as the radial direction of the rotating shaft 11.

[0035] In the embodiment, the plurality of magnetic steels 12 in the rotor assembly 1 are arranged circumferentially around the rotation shaft 11, one stator assembly or a plurality of stator assemblies are arranged in sequence along the axial direction of the rotor assembly 1, the stator assembly is sleeved on the outer periphery of the rotor assembly 1, the claw pole assembly 21 in the stator assembly is arranged around the outer periphery of the rotor assembly 1, the plurality of solenoids 22 are arranged in sequence along the circumferential direction of the claw pole assembly 21, the shell 23 is used to accommodate the claw pole assembly 21 and the plurality of solenoids 22, the coil 222 in the solenoid 22 is wound on the iron core 221, and the central axis of the coil 222 extends along the radial direction of the rotation shaft 11. In this way, the winding central axis of the coil 222 is arranged to be the same as the radial direction of the rotation shaft 11, so that the thickness space occupied by the coil 222 in the radial direction is greatly reduced, the radial size of the motor can be reduced, the lightness and thinness of the motor are facilitated, the width of the coil 222 can be adjusted, the coil 222 is arranged in a flattened manner, the width space of the motor is fully utilized, and the improvement of the torque performance of the motor is facilitated. Therefore, the radial size of the motor can be reduced, the lightness and thinness of the motor are facilitated, and the torque performance of the motor is improved.

[0036] As an implementation manner, the claw pole assembly 21 includes two first claw pole parts 211 and a second claw pole part 212, the two first claw pole parts 211 are arranged around the outer periphery of the rotor assembly 1, one first claw pole part 211 is connected with the top shell 231, the other first claw pole part 211 is connected with the bottom shell 232, the second claw pole part 212 is arranged between the two first claw pole parts 211, the second claw pole part 212 is arranged around the outer periphery of the rotor assembly 1, the first claw pole part 211 is connected with the shell 23, the first end 2211 and the second end 2212 are opposite ends of the iron core 221, the first end 2211 of the iron core 221 is in contact with the second claw pole part 212, and the second end 2212 of the iron core 221 is in contact with the inner wall of the shell 23. The magnetic field generation capacity of the solenoid 22 is enhanced through the iron core 221, so that the motor can generate greater torque under the same current. At the same time, the connection of the iron core 221 with the second claw pole part 212 and the shell 23 ensures the stable fixation of the solenoid 22 in the motor, and reduces the vibration and noise of the motor during rotation.

[0037] As an implementation form, the shell 23 comprises a top shell 231, a bottom shell 232 and a side shell 233, the top shell 231 and the bottom shell 232 are oppositely arranged, and the side shell 233 is connected to the top shell 231 and the bottom shell 232 respectively, the top shell 231 is provided with a top center hole 2311 for the rotor assembly 1 to penetrate, the bottom shell 232 is provided with a bottom center hole 2321 for the rotor assembly 1 to penetrate, and the first claw pole part 211 is provided with two, one first claw pole part 211 is connected with the inner periphery of the top center hole 2311, and the other first claw pole part 211 is connected with the inner periphery of the bottom center hole 2321. The top shell 231, the bottom shell 232 and the side shell 233 can also be integrally formed.

[0038] As an implementation form, the side shell 233 can comprise a first side shell 2331 and a second side shell 2332, the first side shell 2331 and the second side shell 2332 are oppositely arranged, one solenoid 22 is connected with the first side shell 2331, and the other solenoid 22 is connected with the second side shell 2332. At this time, the outer wall of the first side shell 2331 and the outer wall of the second side shell 2332 are both flat surfaces, or the outer wall of the first side shell 2331 and the outer wall of the second side shell 2332 are both arc surfaces, and when the number of solenoids 22 is two, the two solenoids 22 are arranged in axial symmetry with respect to the rotating shaft 11.

[0039] As an implementation form, the inner wall of the coil 222 close to the claw pole assembly 21 and the outer wall of the coil 222 close to the side shell 233 are arc surfaces respectively, and the center line of the inner wall of the coil 222 close to the claw pole assembly 21 and the center line of the outer wall of the coil 222 close to the side shell 233 are both parallel to the rotating shaft 11 respectively, at this time, the outer wall of the first side shell 2331 and the outer wall of the second side shell 2332 are both arc surfaces. Or please refer to Fig. 5, the inner wall of the coil 222 close to the claw pole assembly 21 and the outer wall of the coil close to the side shell 233 are flat surfaces respectively, at this time, the inner wall of the first side shell 2331 and the inner wall of the second side shell 2332 are both flat surfaces, and the outer wall of the first side shell 2331 and the outer wall of the second side shell 2332 are also flat surfaces, which can make the motor keep a smaller radial dimension and adapt to a smaller overall space.

[0040] As an implementation form, please refer to Fig. 6 and Fig. 7, the side shell 233 forms a cylindrical structure, at this time, the solenoid 22 can be provided with at least three, and the at least three solenoids 22 are uniformly arranged along the circumference of the claw pole assembly 21, such as 3, 4, 5, 6, etc. The number of solenoids 22 can be uniformly arranged along the circumference of the claw pole assembly 21.

[0041] In some embodiments, the magnetic pole generated by the solenoid 22 at the second claw pole portion 212 is opposite to the magnetic pole generated by the solenoid 22 at the first claw pole portion 211, such as when the coil 222 of the solenoid 22 is energized, N and S magnetic poles are generated at the two ends of the iron core 221 respectively, wherein the end generating the N magnetic pole is directly connected with the second claw pole portion 212, so that the magnetic property of the second claw pole portion 212 is N; the other end generating the S magnetic pole is connected with the first claw pole portion 211 through the shell 23, so that the magnetic property of the first claw pole portion 211 is S; or S and N magnetic poles are generated at the two ends of the iron core 221 respectively, wherein the end generating the S magnetic pole is directly connected with the second claw pole portion 212, so that the magnetic property of the second claw pole portion 212 is S; the other end generating the N magnetic pole is connected with the first claw pole portion 211 through the shell 23, so that the magnetic property of the first claw pole portion 211 is N. In this way, the N and S poles of the second claw pole portion 212 and the first claw pole portion 211 are alternately distributed, so that the magnetic steel 12 and the rotating shaft 11 are driven to rotate.

[0042] In some embodiments, the first claw pole portion 211 includes a plurality of first claw poles 2111, the second claw pole portion 212 includes a support body 2121 and a plurality of second claw poles 2122, the support body 2121 is sleeved on the rotor assembly 1, the plurality of second claw poles 2122 are arranged on the support body 2121, the support body 2121 is connected with the iron core 221 of the solenoid 22, each first claw pole 2111 is located between two adjacent second claw poles 2122, and the plurality of first claw poles 2111 and the plurality of second claw poles 2122 enclose a claw pole ring, and the plurality of solenoids 22 are located at the outer periphery of the claw pole ring. Through the staggered arrangement of the first claw poles 2111 and the second claw poles 2122, the claw pole assembly 21 has stronger magnetic field distribution uniformity in the circumferential direction of the rotating shaft 11, which is beneficial to improve the torque output stability of the stepping motor. At the same time, the solenoids 22 are located at the outer periphery of the claw pole ring, so that the width space of the motor can be more effectively utilized, the torque performance is further improved, and the radial size is reduced.

[0043] In some embodiments, the first claw pole 2111 is tapered in the direction close to the support body 2121, and the second claw pole 2122 is tapered in the direction away from the support body 2121. The tapered first claw pole 2111 and the tapered second claw pole 2122 make the claw pole assembly 21 have better magnetic field concentration in the radial direction of the motor, which is beneficial to enhance the magnetic field coupling between the claw pole assembly 21 and the magnetic steel 12, so as to improve the torque performance of the stepping motor.

[0044] In some embodiments, the first claw pole 2111 comprises a connecting segment 211a and an extending segment 211b, the extending segment 211b is bent and extends from the connecting segment 211a towards the magnetic steel 12, that is, the gap between the support body 2121 and the magnetic steel 12 has a space for accommodating the extending segment 211b, the extending segment 211b is at least partially inserted into the gap between the support body 2121 and the magnetic steel 12, and the extending segment 211b is bent towards the magnetic steel 12, which is conducive to reducing the radial dimension of the motor and achieving the lightness and thinness of the motor.

[0045] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the examples, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A stepper motor characterized by comprising: The step motor comprises: a rotor assembly comprising a rotating shaft and a plurality of magnetic steels arranged circumferentially around the rotating shaft; one stator assembly or a plurality of stator assemblies arranged in sequence along the axial direction of the rotor assembly, the stator assembly is sleeved outside the rotor assembly, the stator assembly comprises a claw pole assembly arranged around the outer periphery of the rotor assembly, a plurality of solenoids arranged in sequence along the circumferential direction of the claw pole assembly, and a housing for accommodating the claw pole assembly and the plurality of solenoids, the solenoid comprises a core and a coil wound on the core, and the winding center axis of the coil extends along the radial direction of the rotating shaft.

2. The stepper motor of claim 1, wherein: The claw pole assembly comprises a first claw pole part arranged around the outer periphery of the rotor assembly and a second claw pole part arranged around the outer periphery of the rotor assembly, the first claw pole part is provided with two, the second claw pole part is arranged between the two first claw pole parts, and the first claw pole part is connected with the housing; the core comprises a first end in contact with the second claw pole part and a second end in contact with the inner wall of the housing.

3. The stepper motor of claim 2, wherein: The housing comprises a top shell and a bottom shell arranged oppositely and a side shell connecting the top shell and the bottom shell, the top shell is provided with a top center hole for the rotor assembly to penetrate, the bottom shell is provided with a bottom center hole for the rotor assembly to penetrate, one of the first claw pole parts is connected with the inner periphery of the top center hole, and the other first claw pole part is connected with the inner periphery of the bottom center hole.

4. The stepper motor of claim 3, wherein: The number of solenoids is 2, and the two solenoids are arranged in axial symmetry with respect to the rotating shaft.

5. The stepper motor of claim 4, wherein: The side shell comprises a first side shell and a second side shell arranged oppositely, one of the solenoids is connected with the first side shell, and the other solenoid is connected with the second side shell; the outer walls of the first side shell and the second side shell are respectively planar or arc-shaped.

6. The stepper motor of claim 3, wherein: The inner wall of the coil close to the claw pole assembly and the outer wall of the coil close to the side shell are respectively arc-shaped, and the center line of the inner wall of the coil close to the claw pole assembly and the center line of the outer wall of the coil close to the side shell are respectively parallel to the rotating shaft; or the inner wall of the coil close to the claw pole assembly and the outer wall of the coil close to the side shell are respectively planar.

7. The stepper motor of claim 3, wherein: The solenoid is provided with at least three, and the at least three solenoids are uniformly arranged along the circumferential direction of the claw pole assembly.

8. The stepper motor of claim 7, wherein: The side shell is in a cylindrical shape.

9. The stepper motor of claim 2, wherein: The first claw pole part comprises a plurality of first claw poles, the second claw pole part comprises a support body sleeved on the rotor assembly and a plurality of second claw poles arranged on the support body, the support body is connected with the core of the solenoid, each first claw pole is located between two adjacent second claw poles, and a plurality of first claw poles and a plurality of second claw poles form a claw pole ring, and a plurality of solenoids are located on the outer periphery of the claw pole ring.

10. The stepper motor of claim 9, wherein: The first claw pole is tapered in the direction close to the support body; the second claw pole is tapered in the direction away from the support body; the first claw pole comprises a connecting section and an extension section bent and extended in the direction close to the magnetic steel from the connecting section.

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