Rotor core

Abstract

The utility model discloses a rotor core which comprises a plurality of first rotor punching sheets and second rotor punching sheets which are stacked together, the first rotor punching sheets are uniformly and symmetrically arranged at two sides of the second rotor punching sheets, the middle parts of the second rotor punching sheets are provided with second through holes, one sides of the second through holes are provided with diffusion grooves, and the diffusion grooves are communicated with the second through holes. According to the motor rotor, the counter electromotive force can be reduced, and the weight of the rotor iron core can be reduced, so that the iron loss is reduced, the efficiency of the motor is further improved, and the temperature rise of the motor is also reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of rotor core grooving, and particularly relates to a rotor core. Background Technique

[0002] The selection of the number of slots in the motor rotor core is the selection of the number of slots per pole and per phase. In order to obtain better magnetomotive force and electromotive force waveforms and improve the performance of the motor, usually the number of slots in the rotor core is increased, so that the windings can be dispersed, which is beneficial to heat dissipation. However, when the number of slots is too large, the slot utilization rate will decrease, the motor efficiency will also decrease, and it is not conducive to the punching of the rotor core punching sheet.

[0003] At present, the grooving of the rotor core generally makes the same and evenly distributed slot holes on the entire circumference to ensure the efficiency of the motor. For example, the rotor core disclosed in the patent number CN203423547U includes a core body composed of a plurality of stacked core laminations. There is a shaft hole in the middle of the core body, and a plurality of T-shaped key teeth are annularly distributed outside the shaft hole, and four positioning holes are evenly arranged around the shaft hole. The rotor core of the utility model can ensure the concentricity of the rotating shaft and the shaft hole, avoid scratching the rotating shaft during the rotation process, can improve the bearing capacity of the rotor core, keep the motor running smoothly, reduce the noise at the same time, and after anti-rust treatment, it is not easy to rust and has a long service life.

[0004] Since the rotating torque of the rotor comes from the induced magnetic field acting force between the stator and the rotor, the changing magnetic field will generate a vortex induced current in the core, and this induced current will generate a magnetic field that resists the change, generating a back electromotive force. Therefore, when in use, the electromotive force of the rotor core is relatively high, the iron loss is increased during use, the motor efficiency is relatively low, and the motor temperature rise is relatively large. Content of the Utility Model

[0005] The purpose of the utility model is to provide a rotor core to solve the problems put forward in the above background technique.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A rotor core includes a plurality of first rotor punching sheets and second rotor punching sheets stacked together. The first rotor punching sheets are evenly and symmetrically placed on both sides of the second rotor punching sheet. A second through hole is opened in the middle of the second rotor punching sheet. A diffusion groove is opened on one side of the second through hole. A plurality of second permanent magnet through grooves are evenly opened along the circumference of the second rotor punching sheet.

[0008] By adopting the above technical solution: with the second rotor punching sheet provided with diffusion grooves, the changing magnetic field will not be completely confined in the iron core, but will diffuse outward through the diffusion grooves. During operation, it can not only reduce the back electromotive force, but also reduce the weight of the rotor iron core, thereby reducing iron loss, further improving the motor efficiency, and reducing the motor temperature rise.

[0009] Preferably, a plurality of the second rotor punching sheets are evenly divided into two parts, and the diffusion grooves of the second rotor punching sheets in the first part are placed in the opposite direction to those of the second rotor punching sheets in the second part.

[0010] By adopting the above technical solution: the two groups of second rotor punching sheets arranged in the opposite direction can ensure the electromagnetic force balance.

[0011] Preferably, the outside of the second through hole is the second magnetic pole, and a plurality of second T-shaped teeth are evenly arranged along the circumferential direction on the outside of the second magnetic pole.

[0012] By adopting the above technical solution: the second magnetic pole and the second T-shaped teeth are convenient for winding and convenient to use.

[0013] Preferably, a first through hole is provided in the middle of the first rotor punching sheet, and a plurality of first permanent magnet through grooves are evenly arranged along the circumferential direction of the first rotor punching sheet.

[0014] By adopting the above technical solution: the first through hole and the first permanent magnet through grooves are convenient for the installation and use of the rotor iron core.

[0015] Preferably, the outside of the first through hole is the first magnetic pole, and a plurality of first T-shaped teeth are evenly arranged along the circumferential direction on the outside of the first magnetic pole.

[0016] By adopting the above technical solution: the first magnetic pole and the first T-shaped teeth are convenient for winding and convenient to use.

[0017] The technical effects and advantages of the present utility model:

[0018] This product uses the second rotor punching sheet provided with diffusion grooves. The changing magnetic field will not be completely confined in the iron core, but will diffuse outward through the diffusion grooves. During operation, it can not only reduce the back electromotive force, but also reduce the weight of the rotor iron core, thereby reducing iron loss, further improving the motor efficiency, and reducing the motor temperature rise. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0020] Figure 2 is the front view of the present utility model;

[0021] Figure 3 This is a schematic structural view of the second rotor punching sheet in the present utility model;

[0022] Figure 4 This is a schematic structural view of the first rotor punching sheet in the present utility model.

[0023] In the figure: 1. First rotor punching sheet; 11. First through hole; 12. First permanent magnet through groove; 13. First magnetic pole; 14. First T-shaped tooth; 2. Second rotor punching sheet; 21. Second through hole; 22. Diffusion groove; 23. Second permanent magnet through groove; 24. Second magnetic pole; 25. Second T-shaped tooth. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be described clearly and completely in conjunction with the attached Figures 1 - 4 , Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. The specific embodiments described herein are only used to explain the present utility model, and are not used to limit the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0025] Embodiment:

[0026] As Figures 1 - 4 shown, the present utility model provides a rotor core, which includes a plurality of first rotor punching sheets 1 and second rotor punching sheets 2 stacked together. The first rotor punching sheets 1 are evenly and symmetrically placed on both sides of the second rotor punching sheet 2. A second through hole 21 is provided in the middle of the second rotor punching sheet 2, a diffusion groove 22 is provided on one side of the second through hole 21, and a plurality of second permanent magnet through grooves 23 are evenly provided along the circumference of the second rotor punching sheet 2. By using the second rotor punching sheet 2 provided with the diffusion groove 22, the changing magnetic field will not be completely restricted in the iron core, and it will diffuse outward through the diffusion groove 22. During the working process, it can not only reduce the back electromotive force, but also reduce the weight of the rotor core, thereby reducing the iron loss, further improving the motor efficiency, and reducing the motor temperature rise.

[0027] Referring to Figure 2 , the plurality of second rotor punching sheets 2 are evenly divided into two parts, and the diffusion grooves 22 of the second rotor punching sheets 2 in the first part are placed in the opposite direction to the diffusion grooves 22 of the second rotor punching sheets 2 in the second part. The two groups of second rotor punching sheets 2 arranged in the opposite direction can ensure the electromagnetic force balance.

[0028] Referring to Figure 3, outside the second through hole 21 is the second magnetic pole 24. A plurality of second T-shaped teeth 25 are evenly arranged along the circumference on the outside of the second magnetic pole 24. The second magnetic pole 24 and the second T-shaped teeth 25 facilitate winding and are convenient to use.

[0029] Referring to Figure 4 , in the middle of the first rotor punching 1, a first through hole 11 is provided. A plurality of first permanent magnet through grooves 12 are evenly arranged along the circumference of the first rotor punching 1. Outside the first through hole 11 is the first magnetic pole 13. A plurality of first T-shaped teeth 14 are evenly arranged along the circumference on the outside of the first magnetic pole 13. The first through hole 11 and the first permanent magnet through grooves 12 facilitate the installation and use of the rotor core. The first magnetic pole 13 and the first T-shaped teeth 14 facilitate winding and are convenient to use.

[0030] In summary, the product has the characteristics of small back electromotive force, high motor efficiency, light weight, and small motor temperature rise.

[0031] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotor core, characterized in that: It includes a plurality of first rotor punching sheets (1) and second rotor punching sheets (2) stacked together. The first rotor punching sheets (1) are symmetrically placed on both sides of the second rotor punching sheet (2) evenly. A second through hole (21) is provided in the middle of the second rotor punching sheet (2). A diffusion groove (22) is provided on one side of the second through hole (21). A plurality of second permanent magnet through grooves (23) are evenly provided along the circumferential direction of the second rotor punching sheet (2).

2. A rotor core according to claim 1, characterized in that: The plurality of second rotor punching sheets (2) are evenly divided into two parts. The diffusion grooves (22) of the second rotor punching sheets (2) in the first part are placed in the opposite direction to the diffusion grooves (22) of the second rotor punching sheets (2) in the second part.

3. A rotor core according to claim 2, characterized in that: The outside of the second through hole (21) is a second magnetic pole (24). A plurality of second T-shaped teeth (25) are evenly provided along the circumferential direction on the outside of the second magnetic pole (24).

4. A rotor core according to claim 1, characterized in that: A first through hole (11) is provided in the middle of the first rotor punching sheet (1). A plurality of first permanent magnet through grooves (12) are evenly provided along the circumferential direction of the first rotor punching sheet (1).

5. A rotor core according to claim 4, characterized in that: The outside of the first through hole (11) is a first magnetic pole (13). A plurality of first T-shaped teeth (14) are evenly provided along the circumferential direction on the outside of the first magnetic pole (13).

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