Rotor structure and permanent magnet stepping motor

Abstract

The utility model discloses a rotor structure and a permanent magnet stepping motor, the permanent magnet stepping motor comprises the rotor structure, the rotor structure comprises a rotating shaft and a magnetic ring, the rotating shaft comprises a main body part, an extension part and an annular connection part which are connected in sequence from inside to outside, and the rotating shaft is an integrated structure formed integrally; the magnetic ring is connected to the outer side wall of the annular connecting part in an adhesive mode, and a glue containing groove is formed in the outer side wall of the annular connecting part. The rotor structure and the permanent magnet stepping motor provided by the utility model have the characteristic of good reliability, and the extension part and the annular connecting part are integrally formed and processed on the main body part of the rotating shaft, so that the overall weight of the rotor structure is reduced, and the rotational inertia of the permanent magnet stepping motor during operation is reduced; meanwhile, the coaxiality after the magnetic ring and the rotating shaft are installed is ensured; and the glue accommodating groove is formed in the outer side wall of the annular connecting part, so that glue liquid can be conveniently stored, glue overflowing is avoided, the bonding reliability of the magnetic ring and the rotating shaft is ensured, and the reliability of the permanent magnet stepping motor during operation is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stepping motors, in particular to a rotor structure and a permanent magnet stepping motor. Background Art

[0002] The rotor of a permanent magnet stepper motor is usually composed of a magnetic ring shaft. The magnetic ring is made of permanent magnets, and their magnetic field can interact with the magnetic field of the stator to generate torque to drive the rotor to rotate. The shaft is responsible for transmitting torque and supporting the rotor. In existing permanent magnet stepper motors, the motor rotor is formed by a magnetic ring with NS poles and a motor shaft through injection molding to form an integrated structure. This injection molding process has defects: ① First, the rotor has large vibration, and second, the entire rotor assembly is heavy. This causes a large moment of inertia when the motor rotates at high speed, affecting the motor output torque. ② The motor operating temperature is -40℃~+120℃, which is higher than the operating temperature requirements of existing products. The thermal deformation of the injection molded structure rotor has the risk of friction and scratching between the rotor magnetic ring and the soft magnetic material of the motor stator; some motor rotors are fitted through the shaft and two sleeves, and are bonded together through the sleeves on both sides and the magnetic ring. This structure has defects: the connection between the shaft and the magnetic ring is too small, and it is easy to fall off, affecting the reliability of the motor. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a rotor structure with good reliability and a permanent magnet stepping motor.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a rotor structure, including a rotating shaft and a magnetic ring, the rotating shaft includes a main body part, an extension part and an annular connecting part which are connected in sequence from the inside to the outside, and the rotating shaft is an integrally formed one-piece structure; the magnetic ring is adhesively connected to the outer side wall of the annular connecting part, and the outer side wall of the annular connecting part is provided with a glue-receiving groove.

[0005] Furthermore, the cross-sectional shape of the glue containing groove is V-shaped or U-shaped.

[0006] Furthermore, there are multiple glue containing grooves.

[0007] Furthermore, at least one of the glue containing grooves extends in a direction surrounding the axis of the main body.

[0008] Furthermore, at least one of the glue containing grooves extends in the same direction as the axis of the main body.

[0009] Furthermore, the glue containing groove extends in a spiral shape on the outer side wall of the annular connecting portion.

[0010] Furthermore, the number of the glue containing grooves is two, and the spiral directions of the two glue containing grooves are opposite.

[0011] Furthermore, the extension portion is provided with a weight-reducing hole.

[0012] Furthermore, the shape of the weight-reducing hole is circular, elliptical or regular polygonal.

[0013] In order to solve the above technical problems, the utility model also provides a permanent magnet stepping motor, including the above rotor structure.

[0014] The beneficial effects of the utility model are as follows: the rotor structure and permanent magnet stepper motor provided by the utility model have the characteristics of good reliability. By integrally forming an extension portion and an annular connecting portion on the main body of the rotating shaft, the overall weight of the rotor structure is reduced, the moment of inertia of the permanent magnet stepper motor during operation is reduced, and at the same time, the coaxiality of the magnetic ring and the rotating shaft after installation is ensured; and a glue storage groove is provided on the outer side wall of the annular connecting portion, which is convenient for storing glue liquid and avoiding glue overflow, thereby ensuring the reliability of the bonding between the magnetic ring and the rotating shaft and improving the reliability of the permanent magnet stepper motor during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an exploded view of the permanent magnet stepping motor of the first embodiment of the utility model;

[0016] Figure 2 It is an exploded view of the rotor structure of the first embodiment of the present utility model.

[0017] Description of labels:

[0018] 1. Shell; 2. Back cover; 3. Stator; 4. Rotor structure; 41. Rotating shaft; 411. Main body; 412. Extension part; 413. Ring-shaped connecting part; 414. Glue containing groove; 42. Magnetic ring. DETAILED DESCRIPTION

[0019] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0020] Please refer to Figure 1 as well as Figure 2 A rotor structure includes a rotating shaft 41 and a magnetic ring 42, wherein the rotating shaft 41 includes a main body portion 411, an extension portion 412 and an annular connecting portion 413 which are sequentially connected from the inside to the outside, and the rotating shaft 41 is an integrally formed one-piece structure; the magnetic ring 42 is adhesively connected to the outer side wall of the annular connecting portion 413, and the outer side wall of the annular connecting portion 413 is provided with a glue-containing groove 414.

[0021] From the above description, it can be seen that the beneficial effects of the utility model are: by integrally forming the extension portion 412 and the annular connecting portion 413 on the main body 411 of the rotating shaft 41, the overall weight of the rotor structure 4 is reduced, the moment of inertia of the permanent magnet stepper motor during operation is reduced, and at the same time, the coaxiality of the magnetic ring 42 and the rotating shaft 41 after installation is ensured; and a glue containing groove 414 is provided on the outer wall of the annular connecting portion 413, which is convenient for storing the glue liquid and avoiding glue overflow, thereby ensuring the reliability of the bonding between the magnetic ring 42 and the rotating shaft 41 and improving the reliability of the permanent magnet stepper motor during operation.

[0022] Furthermore, the cross-sectional shape of the adhesive containing groove 414 is V-shaped or U-shaped.

[0023] It can be seen from the above description that the cross-sectional shape of the glue containing groove 414 can be set according to actual application requirements, thereby enriching the structural style.

[0024] Furthermore, there are multiple glue containing grooves 414 .

[0025] It can be seen from the above description that a plurality of adhesive grooves 414 are provided on the outer wall of the annular connecting portion 413 , which can further enhance the stability of the magnetic ring 42 and the annular connecting portion 413 when being bonded.

[0026] Furthermore, at least one of the adhesive containing grooves 414 extends in a direction surrounding the axis of the main body 411 .

[0027] Furthermore, at least one of the glue containing grooves 414 extends in the same direction as the axis of the main body 411 .

[0028] It can be known from the above description that the extension direction of the glue containing groove 414 on the annular connecting portion 413 can be set according to actual application requirements.

[0029] Furthermore, the glue containing groove 414 extends in a spiral shape on the outer side wall of the annular connecting portion 413 .

[0030] As can be seen from the above description, the adhesive containing groove 414 is arranged to extend spirally on the outer side wall of the annular connecting portion 413 , which can improve the continuity of the adhesive containing groove 414 on the annular connecting portion 413 and facilitate processing.

[0031] Furthermore, the number of the glue containing grooves 414 is two, and the spiral directions of the two glue containing grooves 414 are opposite.

[0032] It can be seen from the above description that the two spirally extending adhesive containing grooves 414 with opposite spiral directions can further improve the stability of the bonding between the magnetic ring 42 and the annular connecting portion 413 .

[0033] Furthermore, the extension portion 412 is provided with a weight-reducing hole.

[0034] It can be seen from the above description that providing the weight-reducing hole in the extension portion 412 can reduce the overall weight of the rotating shaft 41 .

[0035] Furthermore, the shape of the weight-reducing hole is circular, elliptical or regular polygonal.

[0036] It can be seen from the above description that the shape of the weight-reducing hole can be selected according to actual application requirements.

[0037] In order to solve the above technical problems, the utility model also provides a permanent magnet stepping motor, including the above rotor structure 4.

[0038] Please refer to Figure 1 and Figure 2 , Embodiment 1 of the utility model is: a permanent magnet stepper motor, comprising a housing 1, a back cover 2, a stator 3 and a rotor structure 4, wherein the stator 3 and the rotor structure 4 are installed inside the housing 1, the back cover 2 is installed at the opening of the housing 1, the stator 3 is located outside the rotor structure 4 and connected to the inner wall of the housing 1, the rotor structure 4 comprises a rotating shaft 41 and a magnetic ring 42 installed on the rotating shaft 41, one end of the rotating shaft 41 is rotatably connected to the housing 1, and the other end of the rotating shaft 41 is rotatably connected to the back cover 2; the rotating shaft 41 comprises a main body 411, an extension portion 412 and an annular connecting portion 413 which are sequentially connected from the inside to the outside, the rotating shaft 41 It is an integrally formed one-piece structure; the magnetic ring 42 is glued and connected to the outer wall of the annular connecting part 413, and the outer wall of the annular connecting part 413 is provided with a glue containing groove 414; it can be understood that by integrally forming the extension part 412 and the annular connecting part 413 on the main body 411 of the rotating shaft 41, the overall weight of the rotor structure 4 is reduced, the moment of inertia of the permanent magnet stepper motor during operation is reduced, and at the same time, the coaxiality of the magnetic ring 42 and the rotating shaft 41 after installation is ensured; and a glue containing groove 414 is provided on the outer wall of the annular connecting part 413, which is convenient for storing the glue liquid and avoiding glue overflow, thereby ensuring the reliability of the bonding between the magnetic ring 42 and the rotating shaft 41 and improving the reliability of the permanent magnet stepper motor during operation.

[0039] Optionally, the cross-sectional shape of the glue containing groove 414 is V-shaped or U-shaped, and the cross-sectional shape of the glue containing groove 414 can be set according to actual application requirements to enrich the structural style; further, the number of the glue containing grooves 414 can be one or more.

[0040] Specifically in this embodiment, a plurality of glue grooves 414 are provided on the outer wall of the annular connecting portion 413 , which can further enhance the stability of the bonding between the magnetic ring 42 and the annular connecting portion 413 , and each of the glue grooves 414 extends in a direction surrounding the axis of the main body 411 .

[0041] In some other embodiments, at least one of the glue containing grooves 414 extends in the same direction as the axis of the main body 411, and the extension direction of the glue containing groove 414 on the annular connecting portion 413 can be set according to actual application requirements; further, the glue containing groove 414 can be set to extend in a spiral shape on the outer wall of the annular connecting portion 413. The glue containing groove 414 is set to extend in a spiral shape on the outer wall of the annular connecting portion 413, which can improve the continuity of the glue containing groove 414 on the annular connecting portion 413 and facilitate processing; specifically, the number of the glue containing grooves 414 can be set to two, and the spiral directions of the two glue containing grooves 414 are opposite. In this way, the stability of the magnetic ring 42 and the annular connecting portion 413 when bonded can be further improved.

[0042] Optionally, the extension portion 412 is provided with a weight-reducing hole (not shown), and the provision of the weight-reducing hole in the extension portion 412 can reduce the overall weight of the rotating shaft 41; specifically, the shape of the weight-reducing hole is circular, elliptical or regular polygonal, and the shape of the weight-reducing hole can be selected according to actual application requirements.

[0043] To sum up, the rotor structure and permanent magnet stepper motor provided by the utility model have the characteristics of good reliability. By integrally forming the extension part and the annular connecting part on the main body of the rotating shaft, the overall weight of the rotor structure is reduced, the moment of inertia of the permanent magnet stepper motor during operation is reduced, and at the same time, the coaxiality of the magnetic ring and the rotating shaft after installation is ensured; and a glue storage groove is provided on the outer side wall of the annular connecting part to facilitate the storage of glue liquid and avoid glue overflow, thereby ensuring the reliability of the bonding between the magnetic ring and the rotating shaft and improving the reliability of the permanent magnet stepper motor during operation.

[0044] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A rotor structure, comprising a rotating shaft and a magnetic ring, characterized in that: The rotating shaft includes a main body, an extension part and an annular connecting part which are connected in sequence from the inside to the outside, and the rotating shaft is an integral structure formed in one piece; the magnetic ring is adhesively connected to the outer side wall of the annular connecting part, and the outer side wall of the annular connecting part is provided with a glue containing groove.

2. The rotor structure according to claim 1, characterized in that: The cross-sectional shape of the adhesive containing groove is V-shaped or U-shaped.

3. The rotor structure according to claim 1, characterized in that: The number of the glue containing grooves is multiple.

4. The rotor structure according to claim 3, characterized in that: At least one of the adhesive containing grooves extends along a direction surrounding the axis of the main body.

5. The rotor structure according to claim 3, characterized in that: At least one of the adhesive containing grooves extends in the same direction as the axis of the main body.

6. The rotor structure according to claim 1, characterized in that: The glue containing groove extends in a spiral shape on the outer side wall of the annular connecting portion.

7. The rotor structure according to claim 6, characterized in that: The number of the glue containing grooves is two, and the spiral directions of the two glue containing grooves are opposite.

8. The rotor structure according to claim 1, characterized in that: The extension portion is provided with a weight-reducing hole.

9. The rotor structure according to claim 8, characterized in that: The shape of the weight-reducing hole is circular, elliptical or regular polygonal.

10. A permanent magnet stepping motor, characterized in that: A rotor structure comprising any one of claims 1 to 9.

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