Motor rotor structure

Abstract

A motor rotor structure comprises a rotating shaft, a core body sleeved on the rotating shaft and a sleeve body sleeved on the outer side wall of the core body, the upper end and the lower end of the core body are respectively provided with an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are both made of plastic materials, the outer wall of the rotating shaft is provided with at least one through groove, the through groove penetrates through the position of the upper cover plate, and the upper cover plate is arranged in the through groove. The upper cover plate and the lower cover plate are communicated downwards to the position of the lower cover plate, so that during injection molding, plastic flows from the position of the upper cover plate to the position of the lower cover plate or from the position of the lower cover plate to the position of the upper cover plate through the communication, and the upper cover plate and the lower cover plate are connected together through a connecting strip after molding. According to the utility model, at least one through groove is arranged on the rotating shaft, so that the upper cover plate can be communicated with the lower cover plate, the injection molding process is successful, the whole design is more ingenious than the existing design on the premise of ensuring that the core structure is not damaged, and the working efficiency of the rotor is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to motor technology field, especially relate to a motor rotor structure. BACKGROUND

[0002] The rotation method of motor is the interaction between the rotation magnetic field generated in the stator and the induction magnetic field generated by the rotor, and the rotating shaft and the rotor are in an open state, which is easy to be eroded by external foreign matters, especially the working environment of the motor is relatively harsh, for example: long-term in high temperature, high pressure, closed environment or long-term immersion in liquid, etc., therefore, in order to protect the rotor, the usual practice is to set the steel sleeve on the outer wall of the rotor, and set the cover plate on both ends of the rotating shaft, the two cover plates cover both ends of the rotor, and the two cover plates are consistent with the two ends of the steel sleeve, finally, the cover plate and the steel sleeve are connected and sealed by welding, and the cover plate and the rotating shaft are also connected and sealed by welding. The above protection of the rotor by using metal material has the problems of easy rusting of the steel sleeve and the cover plate, and the rotor may be stuck after rusting, which leads to the failure to use normally, or even if it can work normally, the working efficiency cannot be guaranteed.

[0003] Therefore, the market appears a rotor that adopts a plastic shell to integrally coat an iron core and a permanent magnet. The sealing mode of this structure avoids the rust problem at the welding position of the steel sleeve. For example, Patent No. CN 209709778 U discloses a motor rotor, in which a plastic upper end cover and a plastic lower end cover are adopted. However, during long-time use, we still find that there are many defects: 1. The sleeve body is sleeved on the outer wall of the rotor, and the two plastic cover plates are integrally formed with the iron core, the permanent magnet, and the sleeve body by injection molding. In order to make the two plastic cover plates be located at the two ends of the iron core and be connected with the iron core, the permanent magnet, and the sleeve body to ensure the connection firmness, the injection-molded plastic is usually made to penetrate the two ends of the iron core, that is, to penetrate between the two plastic cover plates. The existing method is to open a through hole in the inner wall of the center hole of the iron core, and the plastic flows through the through hole, so as to form the two plastic cover plates and connect the two plastic cover plates together. This penetration method "sacrifices" the design space of the iron core and reduces the working efficiency of the motor; 2. In the technical solution of the disclosed patent, only the through hole is used as the channel for injection molding, which cannot guarantee the efficiency and smoothness of the flow; 3. The rotating shaft has a water cooling channel composed of an axial hole and a radial hole. When the water flows in the water cooling channel, the water flowing in the radial hole will be cut due to the high-speed rotation of the rotating shaft, which causes the water flow to be turbulent and increases the resistance when the rotating shaft rotates; 4. The rotating shaft and the iron core, the upper end cover, and the lower end cover are matched in a circular shaft and a circular hole structure. The iron core, the upper end cover, and the lower end cover may be separated from the rotating shaft, so that the iron core, the upper end cover, and the lower end cover cannot rotate synchronously with the rotating shaft; 5. The rotor only uses the water cooling channel for cooling, and the cooling effect is poor; 6. The connection firmness between the upper end cover, the lower end cover, and the sleeve body is poor, and the upper end cover, the lower end cover, and the sleeve body are easy to fall off.

[0004] Therefore, how to design a rotor structure with a more optimized two-plastic-cover-plate connection structure without affecting the efficiency of the motor has become a technical problem that needs to be solved in the industry. SUMMARY

[0005] The utility model solves the prior art problems and provides a motor rotor structure, which optimizes the prior design scheme and makes up for various defects.

[0006] The utility model solves the above technical problems by adopting the following technical scheme:

[0007] The utility model discloses a motor rotor structure, including the pivot, the core body of setting on the pivot and the sleeve body of setting on the lateral wall of core body, the upper end of core body, lower end is equipped with upper cover plate, lower cover plate respectively, and upper cover plate, lower cover plate are all plastic material quality, the outer wall of pivot is equipped with at least one through groove, and the through groove is through to the upper cover plate position, and the lower is through to the lower cover plate position, thereby when injection moulding, the plastic is through the through and realizes the circulation from the upper cover plate position to the lower cover plate position / the lower cover plate position to the upper cover plate position, and after forming makes the upper cover plate, lower cover plate be connected together through the connecting strip, be equipped with the anti -loose structure between upper cover plate and sleeve body, between lower cover plate and sleeve body.

[0008] Compared with the prior art, the plastic material of the upper cover plate and the lower cover plate of the utility model involves plastic that realizes circulation through the plurality of through grooves, thereby smoothly completing the injection molding work, and without occupying the space of the core body, so that, under the same conditions, the rotor structure of the utility model can ensure the power and performance of the motor during operation; moreover, the plurality of through grooves can improve the flow speed of the plastic and improve the processing efficiency of injection molding; in addition, the core body is formed by stacking a plurality of silicon steel sheets, and the dimensional tolerance of each silicon steel sheet is large during manufacturing, which leads to a large dimensional error of the overall core body after manufacturing. By injection molding the upper cover plate and the lower cover plate, the core body can be protected, and the dimensional error after initial manufacturing of the core body can be compensated for, so that the overall size can be relatively accurate.

[0009] The anti-loose structure includes an annular taper surface arranged on the upper part of the outer lateral wall of the core body and an annular groove arranged on the lower part of the outer lateral wall of the core body. The upper edge and the lower edge of the sleeve body are flush with the upper edge and the lower edge of the core body, and the outer periphery of the upper cover plate and the lower cover plate is flush with the outer periphery of the core body, so that the sleeve body, the upper cover plate, and the annular taper surface jointly form an upper annular cavity, and the sleeve body, the lower cover plate, and the annular groove jointly form a lower annular cavity. A part of the upper cover plate and the lower cover plate is respectively embedded in the upper annular cavity and the lower annular cavity.

[0010] The anti-loose structure firmly fixes the upper cover plate, the lower cover plate, the sleeve body, and the core body together, which is not only due to the plastic viscosity during injection molding, but also achieved by using the upper annular cavity and the lower annular cavity.

[0011] The center of the upper surface and the lower surface of the core body is respectively provided with an upper groove and a lower groove, the upper end and the lower end of the through groove are respectively through the upper groove and the lower groove, and the length of the through groove is less than or equal to the distance between the upper surface of the upper cover plate and the lower surface of the lower cover plate.

[0012] The core body with the upper groove and the lower groove structure can reduce the length of the through groove, thereby avoiding the condition of poor rigidity of the pivot caused by the excessive length of the through groove, and improving safety.

[0013] The upper groove and the lower groove are trapezoidal in shape.

[0014] The trapezoidal shape can increase the fitting area of the upper cover plate and the lower cover plate on the inner surface of the upper groove and the lower groove, thereby improving the firmness.

[0015] The fixed hole in the center of the core body is penetrated by the rotating shaft, and at least one straight groove is arranged on the inner wall of the fixed hole in the axial direction, and the at least one straight groove is matched with the at least one through groove.

[0016] The straight groove is added, so that the flow between the upper cover plate and the lower cover plate is not only realized by the through groove, but also realized by the straight groove during injection molding, thereby greatly improving the flow speed of the plastic and making the connection between the upper cover plate and the lower cover plate more firm after molding; since the straight groove is on the inner wall of the fixed hole, the rotating shaft, the core body and the upper cover plate and the lower cover plate have a limiting structure after molding, so that the self-rotation is avoided.

[0017] The water cooling hole is arranged in the rotating shaft in the axial direction, the water cooling hole is a stepped hole including a large radius hole and a small radius hole, and a plurality of through holes are uniformly distributed on the lower cover plate and opposite to the lower groove.

[0018] The water cooling hole is designed in the axial direction, the water flows in a straight line in the water cooling hole, and the axis of the water cooling hole is actually the center line of the rotating shaft, so that the high-speed rotation of the rotating shaft does not affect the flow speed and direction of the water in the water cooling hole; the design of the plurality of through holes also enables the water to contact the surface of the core body, thereby improving the water cooling effect.

[0019] One end of the rotating shaft is provided with a square clamping groove.

[0020] When the motor rotating shaft is stuck, a tool is inserted into the square clamping groove, so that the rotating shaft is rotated by external force, thereby releasing the sticking.

[0021] The beneficial effects of the utility model are as follows:

[0022] Compared with the prior art, the motor rotor structure adopting the utility model structure sets at least one through groove on the rotating shaft, so that the upper cover plate and the lower cover plate can be penetrated, the injection molding process is successful, and the entire design is more ingenious than the prior design under the premise of ensuring that the core structure is not lost, thereby ensuring the efficiency of the rotor during work; in addition, the connection performance between various parts of the utility model is improved by the anti-loosening structure and the water cooling hole, and the safety and use performance during work are improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is a perspective view of the motor rotor structure of the utility model from one angle;

[0024] Fig. 2 is another perspective view of the motor rotor structure of the utility model;

[0025] Fig. 3 is a sectional view of the motor rotor structure of the utility model;

[0026] Fig. 4 is a perspective exploded view of the motor rotor structure of the utility model. DETAILED DESCRIPTION

[0027] The application will be further described in detail below in combination with the drawings and specific embodiments:

[0028] Please refer to Figs. 1 to 4 The utility model provides a kind of motor rotor structure, including shaft 1, the core 2 of sleeve setting on shaft 1 and the sleeve 3 of sleeve setting in the outer side wall of core 2, sleeve 3 can adopt plastic, also can adopt metal material such as stainless steel, the upper end of core 2, lower end is respectively equipped with upper cover plate 4, lower cover plate 5, and upper cover plate 4, lower cover plate 5 are plastic material quality;At least one through groove 6 is equipped on the outer wall of shaft 1, to avoid the problem of the overall strength reduction of shaft 1 caused by too many through grooves 6 design, we design two through grooves 6, 180 degree distribution, and, we can reduce the design length of through groove 6, one of its purposes is also to avoid the problem of rigidity of shaft 1, so, we are equipped with upper recess 7, lower recess 8 in the center of the upper surface, lower surface of the core 2, and the upper end, lower end of through groove 6 is respectively penetrated to upper recess 7, lower recess 8.

[0029] Of course, the design length range of through groove 6 is: less than or equal to the distance between the upper surface of upper cover plate 4 and the lower surface of lower cover plate 5, wherein the most safe length is the distance between upper recess 7 and lower recess 8.

[0030] No matter which design length, the ultimate purpose is to make the upper through groove 6 to the position of upper cover plate 4, and the lower through groove 6 to the position of lower cover plate 5, so that when injection molding, plastic is circulated through the through from the position of upper cover plate 4 to the position of lower cover plate 5 / the position of lower cover plate 5 to the position of upper cover plate 4.

[0031] The anti-loosening structure is arranged between the upper cover plate 4 and the sleeve body 3 and between the lower cover plate 5 and the sleeve body 3, and comprises an annular taper surface 11 arranged on the upper portion of the outer sidewall of the core body 2 and an annular groove 12 arranged on the lower portion of the outer sidewall of the core body 2, the upper edge and the lower edge of the sleeve body 3 are flush with the upper edge and the lower edge of the core body 2, and the outer circumferential surface of the upper cover plate 4 and the lower cover plate 5 is flush with the outer circumferential surface of the core body 2, so that the sleeve body 3, the upper cover plate 4 and the annular taper surface 11 jointly form an upper annular cavity 13, the sleeve body 3, the lower cover plate 5 and the annular groove 12 jointly form a lower annular cavity 14, and a part of the upper cover plate 4 and the lower cover plate 5 are respectively embedded into the upper annular cavity 13 and the lower annular cavity 14.

[0032] The anti-loosening structure enables the upper cover plate 4, the lower cover plate 5, the sleeve body 3 and the core body 2 to be firmly fixed together, which is not only due to the plastic viscosity during injection molding, but also due to the upper annular cavity 13 and the lower annular cavity 14, that is, during injection molding, the plastic flows to the position of the upper cover plate 4, the through groove 6, the position of the lower cover plate 5, the upper annular cavity 13 and the lower annular cavity 14, so that the upper cover plate 4 and the lower cover plate 5 are connected together by the connecting strip 15 in the through groove 6 after molding, and the plastic flowing into the upper annular cavity 13 and the lower annular cavity 14 becomes an adhering structure of the upper cover plate 4 and the lower cover plate 5 after molding, thereby greatly improving the connection firmness between the upper cover plate 4, the lower cover plate 5, the sleeve body 3 and the core body 2.

[0033] The upper groove 7 and the lower groove 8 are trapezoidal in shape.

[0034] The trapezoidal shape can increase the fitting area of the upper cover plate 4 and the lower cover plate 5 on the inner surfaces of the upper groove 7 and the lower groove 8, thereby improving the firmness.

[0035] In order to further improve the plastic flow speed and smoothness from the position of the upper cover plate 4 to the position of the lower cover plate 5 during injection molding, two axial straight grooves 17 are arranged on the inner wall of the fixing hole 16 in the center of the core body 2, and the two straight grooves 17 one-to-one correspond to the two through grooves 6, preferably, the length and inner diameter of the straight groove 17 are smaller than those of the through groove 6, which serves as an auxiliary for the plastic flow speed during injection molding and makes the connection between the upper cover plate 4 and the lower cover plate 5 more firm after molding; since the straight groove 17 is arranged on the inner wall of the fixing hole 16, the upper cover plate 4, the lower cover plate 5, the rotating shaft 1 and the core body 2 have a limiting structure after molding, thereby avoiding self-rotation.

[0036] The utility model still has good heat dissipation effect, the reason is in: the water cooling hole 18 is arranged in the rotating shaft 1 along the axial direction, the water cooling hole 18 is stepped hole, including big radius hole 19 and small radius hole 20, the position of the lower cover plate 5 is uniformly distributed with a plurality of through holes 21 in the circumferential direction.

[0037] The water cooling hole 18 is axially designed, water flows linearly in the water cooling hole 18, and the axis of the water cooling hole 18 is actually the center line of the rotating shaft 1, so that the high-speed rotation of the rotating shaft 1 does not affect the flow speed and direction of water in the water cooling hole 18; the design of the plurality of through holes 21 also enables water to contact the surface of the core 2, thereby improving the water cooling effect.

[0038] The water cooling hole 18 is designed as a stepped hole, the rotor structure of the utility model is applied to a motor of a water pump, the large-radius hole 19 of the utility model is opposite to the pump body, so that part of high-pressure water generated by the water pump enters the large-radius hole 19 and flows out from the small-radius hole 20, and since the flow radius of water is from large to small, the pressure, speed and impact force of water flow are improved, so that the flow speed of water is improved and the water cooling effect is improved.

[0039] In actual use, the motor rotating shaft is often stuck when starting, in order to solve the problem of how to remove the stuck phenomenon, a square clamping groove 22 is arranged at one end of the rotating shaft 1, when the motor rotating shaft is stuck, a tool is inserted into the square clamping groove 22, so that the rotating shaft is rotated by external force, and the stuck phenomenon is removed.

[0040] In summary, the upper cover plate 4 and the lower cover plate 5 of the plastic material related to the plastic material are communicated through the plurality of through grooves 6, so that the injection molding work is smoothly completed, and the core space is not occupied, so that under the same conditions, the rotor structure of the utility model can guarantee the power and performance of the motor during operation, the plurality of through grooves can improve the flow speed of the plastic material and improve the processing efficiency of the injection molding, in addition, the core 2 is formed by stacking a plurality of silicon steel sheets, the dimensional tolerance of each silicon steel sheet is large during manufacturing, which leads to large dimensional error of the core after manufacturing, and the upper cover plate 4 and the lower cover plate 5 are injected, so that the core 2 is protected and the dimensional error of the core 2 after initial manufacturing is compensated, so that the overall size can reach a relatively accurate degree.

[0041] The motor rotor structure provided by the embodiment of the utility model is described in detail, specific examples are applied in this paper to describe the principle and implementation mode of the utility model, and the above embodiment is only used to help understand the technical scheme disclosed by the utility model; meanwhile, according to the idea of the utility model, the specific implementation mode and application range will be changed by the general technical personnel in the field, and the above description should not be understood as the limitation of the utility model.

Claims

1. A motor rotor structure, comprising a rotating shaft, a core body sleeved on the rotating shaft, and a sleeve body sleeved on the outer wall of the core body, the upper end and the lower end of the core body are respectively provided with an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are both made of plastic material, characterized in that: The outer wall of the rotating shaft is provided with at least one through groove, the through groove is through to the upper cover plate position and the lower cover plate position, so that the plastic flows through the through groove from the upper cover plate position to the lower cover plate position / the lower cover plate position to the upper cover plate position during injection molding, and the upper cover plate and the lower cover plate are connected together by the connecting strip after molding.

2. An electrical machine rotor structure according to claim 1, characterized in that: The upper cover plate and the sleeve body, the lower cover plate and the sleeve body are provided with an anti-loose structure, the anti-loose structure includes an annular taper surface arranged on the upper part of the outer sidewall of the core body and an annular groove arranged on the lower part of the outer sidewall of the core body, the upper edge and the lower edge of the sleeve body are flush with the upper edge and the lower edge of the core body, and the outer circumferential surface of the upper cover plate and the lower cover plate is flush with the outer circumferential surface of the core body, so that the sleeve body, the upper cover plate and the annular taper surface jointly form an upper annular cavity, the sleeve body, the lower cover plate and the annular groove jointly form a lower annular cavity, and a part of the upper cover plate and the lower cover plate are respectively embedded in the upper annular cavity and the lower annular cavity.

3. An electrical machine rotor structure according to claim 1 or 2, characterized in that: The center of the upper surface and the lower surface of the core body is respectively provided with an upper groove and a lower groove, the upper end and the lower end of the through groove are respectively through to the upper groove and the lower groove, and the length of the through groove is less than or equal to the distance between the upper surface of the upper cover plate and the lower surface of the lower cover plate.

4. An electrical machine rotor structure according to claim 3, characterised in that: The upper groove and the lower groove are trapezoidal in shape.

5. An electrical machine rotor structure according to claim 1, characterized in that: The center of the core body is provided with a fixing hole, the rotating shaft passes through the fixing hole, and the inner wall of the fixing hole is provided with at least one straight groove in the axial direction, and the at least one straight groove corresponds to and matches the at least one through groove.

6. An electrical machine rotor structure according to claim 1, characterized in that: The rotating shaft is provided with a water cooling hole in the axial direction, the water cooling hole is a stepped hole including a large radius hole and a small radius hole, and the lower cover plate is uniformly provided with a plurality of through holes at a position opposite to the lower groove.

7. An electrical machine rotor structure according to any one of claims 1-6, characterized in that: One end of the rotating shaft is provided with a square clamping groove.

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