CN216451205U - Rotor structure of low-power direct-current motor - Google Patents
Rotor structure of low-power direct-current motor Download PDFInfo
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- CN216451205U CN216451205U CN202122566285.3U CN202122566285U CN216451205U CN 216451205 U CN216451205 U CN 216451205U CN 202122566285 U CN202122566285 U CN 202122566285U CN 216451205 U CN216451205 U CN 216451205U
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Abstract
The utility model provides a rotor structure of a low-power direct-current motor, which comprises a rotor shell, a rotor magnetic ring and a rotating shaft, wherein the rotor shell comprises a cylindrical side plate and an end plate which is arranged at one end of the side plate and seals the end; the caliber of the inner side wall of the side plate is gradually reduced from the opening end to the sealing end to form a conical inclined plane; the caliber of the outer side wall of the rotor magnetic ring is gradually reduced from the first end to the second end of the rotor magnetic ring to form a conical matching surface corresponding to the conical inclined surface; the rotor magnetic ring is arranged in the rotor shell, the first end of the rotor magnetic ring faces the end plate, and a conical matching surface formed by the outer side wall of the rotor magnetic ring is attached to a conical inclined surface formed by the inner side wall of the side plate. By the technical scheme, the rotor shell and the rotor magnetic ring can be assembled without glue, large-scale mechanical production of the motor rotor is facilitated, and meanwhile the connection precision of the rotor shell and the rotor magnetic ring is ensured.
Description
Technical Field
The utility model relates to the technical field of direct current motors, in particular to a rotor structure of a low-power direct current motor.
Background
The brushless direct current motor basically comprises a stator component fixedly arranged and a rotor component capable of rotating around a shaft, wherein a coil is arranged on the stator, a permanent magnet steel and other magnets are arranged on the rotor, when the rotor rotates, current can be generated in the coil, and the current can be led out through an output circuit connected with the stator to realize power supply.
The magnets of the rotor assembly are typically in the form of magnetic rings which are fixedly mounted within a cylindrical rotor housing. The patent document CN202021257072.1 discloses a rotor structure of an external rotor motor and an external rotor motor using the same, in which a rotor housing includes an end plate and a sleeve housing extending from an edge of the end plate, a cavity is formed in the sleeve housing, and a plurality of permanent magnets are circumferentially mounted on an inner wall surface of the sleeve housing at intervals. In the general technical scheme that above-mentioned patent document adopted, the installation between sleeve and the permanent magnet usually needs intermediate medium such as glue to bond, and the assembly process is comparatively troublesome, and efficiency is lower during mechanical automation production, and use glue to bond also does not benefit to rotor structure's standardized production.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a rotor structure of a low-power direct-current motor, which can avoid the use of glue, has higher installation efficiency between a magnet and a shell and improves the standardization degree.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a rotor structure of a low-power direct-current motor comprises a rotor shell, a rotor magnetic ring and a rotating shaft, wherein the rotor shell comprises a cylindrical side plate and an end plate which is arranged at one end of the side plate and seals the end plate; the caliber of the inner side wall of the side plate is gradually reduced from the opening end to the sealing end to form a conical inclined plane; the caliber of the outer side wall of the rotor magnetic ring is gradually reduced from the first end to the second end of the rotor magnetic ring to form a conical matching surface corresponding to the conical inclined surface; the rotor magnetic ring is arranged in the rotor shell, the first end of the rotor magnetic ring faces the end plate, and a conical matching surface formed by the outer side wall of the rotor magnetic ring is attached to a conical inclined surface formed by the inner side wall of the side plate.
The utility model adopts a press-in mode of a press to install a rotor shell and a rotor magnetic ring, the inner wall of the rotor shell forms a horn-shaped structure with the caliber gradually increasing from a sealing end to an opening end, the outer side wall of the rotor magnetic ring forms a matching structure with the caliber gradually increasing from a first end to a second end, when the rotor magnetic ring is installed, the first end of the rotor magnetic ring is embedded into the rotor shell towards an end plate of the rotor shell, then the press is utilized to apply pressure to the second end of the rotor magnetic ring, the rotor magnetic ring is further pressed into the rotor shell under the guiding matching of a conical inclined surface of the rotor shell on the conical matching surface of the rotor magnetic ring, and the conical inclined surface and the conical matching surface form tight joint and locking. When the rotor magnetic ring is pressed into the rotor shell, the side plate is elastically deformed under the action of pressure, the caliber of the rotor magnetic ring is enlarged, the rotor magnetic ring can be embedded into the deep part of the rotor shell, and when the pressure disappears, the side plate is elastically restored to generate the clamping force on the rotor magnetic ring, so that the rotor magnetic ring is fixedly arranged in the rotor shell. The installation mode is interference fit, and the caliber of the inner side wall of the rotor shell is equal to or slightly smaller than that of the outer side wall of the rotor magnetic ring at the corresponding position.
Furthermore, the end face of the first end of the rotor magnetic ring is attached to the end plate. After the rotor magnetic ring is installed, the end face of the first end of the rotor magnetic ring is attached to the inner side face of the end plate, so that a cavity is prevented from being formed between the rotor magnetic ring and the end plate, and the installation precision of the rotor magnetic ring is improved.
Furthermore, the taper angle of the tapered inclined plane and the tapered matching surface is 2-10 degrees. The taper angle refers to the taper angle of the conical structure formed after the conical inclined surface and the conical matching surface are extended, and the firmness of the interference fit is affected if the taper angle is too large.
Furthermore, the end plate and the side plate are of an integrated structure. The integral structure means that the end plate and the side plate are integrally formed through a die in the production process, and are not produced in sequence and then welded.
Furthermore, the caliber of the inner side wall of the rotor magnetic ring is kept constant from the first end to the second end of the rotor magnetic ring. The rotor generally includes both an inner rotor and an outer rotor, with the difference that the inner rotor rotates inside the stator and the outer rotor rotates around the outer circumference of the stator. The utility model adopts the scheme of an inner rotor, and the stator is arranged in the middle of the magnetic ring. Because the stability of magnetic field guidance in the middle of the magnetic ring and the matching degree of the middle of the magnetic ring and the stator need to be ensured, the inner side wall of the magnetic ring is set to be a cylindrical structure with a constant caliber instead of a conical structure. The rotor shell only needs to ensure that the inner side wall forms a conical surface structure, and the outer side wall can be a conical surface or a cylindrical surface.
Furthermore, the middle part of the end plate is provided with a mounting hole, and the rotating shaft is fixedly mounted on the mounting hole along the axial direction.
Furthermore, a circle of stamping reinforcing ribs are arranged on the periphery of the mounting hole. The rotating shaft and the mounting hole can also be connected in an interference fit mode, and in order to ensure that the contact ratio between the rotating shaft and the rotor axis cannot be influenced by excessive deformation of the mounting hole of the end plate in the interference fit, a circle of stamping reinforcing ribs are arranged on the periphery of the mounting hole to improve the structural stability.
Furthermore, a clamp spring groove is arranged on the rotating shaft.
In summary, the following beneficial effects can be achieved by adopting the technical scheme of the utility model:
1. the utility model does not need to adopt glue to bond the rotor magnetic ring and the rotor shell, reduces the production cost, reduces the production procedures, improves the production efficiency and is beneficial to large-scale mechanical assembly in industrial production.
2. Compared with the scheme of adopting glue to bond the rotor magnetic ring, the utility model has higher product standardization degree, the glue application amount and the glue curing effect in the glue bonding method can influence the installation precision of the magnetic ring, and in order to apply the glue, the inner diameter of the rotor shell is generally required to be slightly larger than the outer diameter of the rotor magnetic ring, which further increases the installation error of the rotor magnetic ring.
Drawings
Fig. 1 is a front sectional view of a rotor structure of a direct current motor in embodiment 1; the dotted line part in the figure is for annotation and does not represent the actual structure;
fig. 2 is a left side view of the rotor case in embodiment 1;
fig. 3 is a front sectional view of a rotor structure of a direct current motor of embodiment 2; the dotted line part in the figure is for annotation and does not represent the actual structure;
fig. 4 is a left side view of the rotor case in embodiment 2;
in the figure, 1-rotor shell, 2-rotor magnetic ring, 3-rotating shaft, 11-end plate, 12-side plate, 13-mounting hole, 14-stamping reinforcing rib and 31-clamp spring groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first" and "second" are used for descriptive purposes only and are not intended to indicate or imply relative importance, and moreover, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
The embodiment shown in fig. 1 and 2 provides a rotor structure of a low-power dc motor, which includes a rotor housing 1, a rotor magnet ring 2 mounted in the rotor housing 1, and a rotating shaft 3 axially penetrating the middle of the rotor housing 1.
The rotor case 1 includes an end plate 11 having a circular plate shape and a side plate 12 formed in a cylindrical shape by being surrounded, and the end plate is provided at and seals one end of the side plate. The caliber of a side plate of the rotor shell is gradually reduced from an opening end to a sealing end to form a conical structure, the cone angle of the conical structure is 6 degrees, and the inner side wall of the side plate forms a conical inclined plane.
The rotor magnetic ring is in a hollow cylindrical structure, the caliber of the outer side wall of the rotor magnetic ring is gradually increased from the first end to the second end to form a conical matching surface, the conical matching surface is formed, the size of the conical angle of the conical inclined surface is the same, and the caliber of the inner side wall of the rotor magnetic ring is unchanged to form a cylindrical surface.
When the rotor shell and the rotor magnetic ring are installed in a matched mode, a conical matching face located on the outer side wall of a rotor magnet and a conical inclined face located on the inner side wall of the rotor shell can be attached to each other, specifically, the rotor magnetic ring is embedded into a cavity formed by enclosing the side plates and the end plates from a first end towards the direction of the end plates, then pressure is applied from a second end of the rotor magnetic ring through a press machine, the rotor magnetic ring is further pressed into the cavity, the side plates are elastically collided under the action of the press machine to enable the rotor magnetic ring to go deep into the bottom of the cavity, the end face of the first end portion of the rotor magnetic ring is abutted to the inner end face of the end plate, the positioning effect is achieved, then the press machine removes the pressure, at the moment, the side plates are elastically restored to clamp the rotor magnetic ring in the cavity, and the rotor magnetic ring is fixedly installed.
As shown in FIG. 1, the thickness of the side plate is kept uniform in this embodiment, so that the conical taper angle formed by the outer side wall and the inner side wall of the side plate is consistent, namely, alpha1＝β 13 deg. The rotor housing is then overall flared, and as shown in fig. 2, the end plate and the side plate projecting obliquely relative to the end plate can be seen from the left.
At the middle part of end plate with be equipped with a mounting hole 13, accomplish fixed connection in the mounting hole is gone into to the pivot adoption interference fit's mode card, the periphery of mounting hole is equipped with round punching press strengthening rib 14 and can not take place excessive deformation when guaranteeing interference fit. At the end extending into the cavity, a snap spring groove 31 is provided on the rotating shaft, through which a snap spring can be installed to prevent the motor rotor from sliding on the bearing.
Example 2
The present embodiment is substantially the same as embodiment 1, except that the thickness of the side plate varies with the position, the thickness of the side plate is the largest at the position close to the end plate, the thickness of the side plate gradually decreases with the distance from the end plate, the caliber of the inner side wall of the side plate gradually increases from the sealing end to the opening end by the thickness variation to meet the matching requirement of the rotor magnetic ring, and the outer side wall of the side plate does not form a tapered structure, but forms a cylindrical surface, i.e. alpha2=3°，β2=0 °. As shown in fig. 4, the outer contour of the rotor housing does not have a trumpet-like structure when viewed from the left, but has a straight cylindrical structure.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.
Claims (8)
1. The utility model provides a miniwatt direct current motor rotor structure, includes rotor housing, rotor magnetic ring and pivot, its characterized in that: the rotor shell comprises a cylindrical side plate and an end plate which is arranged at one end of the side plate and seals the end part; the caliber of the inner side wall of the side plate is gradually reduced from the opening end to the sealing end to form a conical inclined plane; the caliber of the outer side wall of the rotor magnetic ring is gradually reduced from the first end to the second end of the rotor magnetic ring to form a conical matching surface corresponding to the conical inclined surface; the rotor magnetic ring is arranged in the rotor shell in an interference fit mode, the first end of the rotor magnetic ring faces the end plate, and a conical matching surface formed by the outer side wall of the rotor magnetic ring is attached to a conical inclined surface formed by the inner side wall of the side plate.
2. The rotor structure of a low power dc motor according to claim 1, wherein: the end face of the first end of the rotor magnetic ring is attached to the end plate.
3. The rotor structure of a low power dc motor according to claim 1, wherein: the taper angle of the tapered inclined plane and the tapered matching surface is 2-10 degrees.
4. The rotor structure of a low power dc motor according to claim 1, wherein: the end plate and the side plate are of an integrated structure.
5. The rotor structure of a low power dc motor according to claim 1, wherein: the caliber of the inner side wall of the rotor magnetic ring is kept constant from the first end to the second end of the rotor magnetic ring.
6. The rotor structure of a low power dc motor according to claim 1, wherein: the middle part of the end plate is provided with a mounting hole, and the rotating shaft is fixedly mounted on the mounting hole along the axial direction.
7. The rotor structure of a low power dc motor according to claim 6, wherein: and a circle of stamping reinforcing ribs are arranged on the periphery of the mounting hole.
8. The rotor structure of a low power dc motor according to claim 6, wherein: the rotating shaft is provided with a clamp spring groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122566285.3U CN216451205U (en) | 2021-10-25 | 2021-10-25 | Rotor structure of low-power direct-current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122566285.3U CN216451205U (en) | 2021-10-25 | 2021-10-25 | Rotor structure of low-power direct-current motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216451205U true CN216451205U (en) | 2022-05-06 |
Family
ID=81351079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122566285.3U Active CN216451205U (en) | 2021-10-25 | 2021-10-25 | Rotor structure of low-power direct-current motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216451205U (en) |
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2021
- 2021-10-25 CN CN202122566285.3U patent/CN216451205U/en active Active
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