A high-speed motor rotor that can reduce eddy current losses in magnets

Abstract

This utility model relates to a high-speed motor rotor that can reduce eddy current losses in magnets. It includes a rotor core with an inner hole inside. The inner hole is surrounded by uniformly spaced slots, and the slots are surrounded by uniformly spaced embedding slots. Permanent magnets are embedded in each embedding slot. The rotor core is also surrounded by a heat dissipation sleeve, which has the advantages of enhancing heat dissipation during rotor operation, reducing eddy current losses in magnets, and improving rotor service life.

Description

Technical Field

[0001] This utility model relates to the field of motor rotor processing technology, and in particular to a high-speed motor rotor that can reduce eddy current losses in magnets. Background Technology

[0002] The motor rotor is the core component responsible for rotation in a motor. It typically includes the rotor core, shaft, and commutator. The rotor core is usually made of 0.5mm thick silicon steel sheets through stamping and stacking. Motor rotors face numerous technical challenges when rotating at high speeds, including high precision, high power density, high speed, and heat dissipation issues arising from integrated design. At high speeds, the rotor experiences enormous centrifugal force, increasing frictional losses and leading to a sharp increase in heat generation, coupled with insufficient effective heat dissipation space. These problems not only affect the motor's lifespan and operating efficiency but can also trigger a vicious cycle, reducing the motor's safety and reliability.

[0003] Patent application number CN202423044884.9 is a Chinese utility model patent, disclosing a rotor structure for a high-speed motor, relating to the field of motor technology. The structure includes rotor laminations, lugs, a rotor core, positioning protrusions, magnet mounting slots, and magnets. The rotor laminations are multiple pieces, each lamination having multiple lugs evenly spaced along its circumference. The ends of the lugs are hook-shaped structures bent to one side, and the hook-shaped structures of adjacent lugs on each rotor lamination are symmetrical. Multiple rotor laminations are stacked together at a predetermined angle along the circumference to form the structure. The rotor core has multiple lugs on each rotor lamination stacked axially to form multiple positioning protrusions. These protrusions form magnet positioning slots along the rotor core's axial direction. Multiple magnets are installed one-to-one within these slots along the rotor core axis. During high-speed motor rotation, the positioning protrusions hook the magnets, preventing them from flying out due to centrifugal force and causing reduced motor power or failure. However, this rotor has the following problems: firstly, it cannot reduce eddy current losses in the magnets; secondly, its heat dissipation efficiency is low. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by setting a semi-circular groove and through-hole structure in the heat dissipation sleeve, as well as a semi-circular convex groove structure on the left and right sides of the hollow groove to solve the technical problems of the rotor's inability to reduce magnet eddy current losses and low heat dissipation efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A high-speed motor rotor that can reduce eddy current losses in magnets includes a rotor core. The rotor core has an inner hole, and the outer periphery of the inner hole is uniformly provided with hollow grooves. The outer periphery of the hollow grooves is uniformly provided with embedding grooves, and permanent magnets are embedded in the embedding grooves. The rotor core is provided with a heat dissipation sleeve.

[0007] As a preferred embodiment, the heat dissipation sleeve is provided with a uniform semi-circular groove on its outer side and a uniform through hole on its inner side.

[0008] As a preferred embodiment, the through hole extends through the entire heat dissipation sleeve from front to back.

[0009] As a preferred embodiment, the heat dissipation sleeve is made entirely of carbon fiber.

[0010] As a preferred embodiment, the hollowed-out groove is provided with semi-circular protrusions on both the left and right sides.

[0011] As another preferred embodiment, the semi-circular protrusions are symmetrically arranged and connected together with the hollowed-out slots, penetrating the rotor core from front to back.

[0012] The beneficial effects of this utility model are:

[0013] (1) In this utility model, the semi-circular groove on the heat dissipation sleeve increases the external heat dissipation surface area of ​​the rotor, which can more effectively dissipate the heat generated by the rotor rotation. At the same time, the through holes in the sleeve can form an air convection channel, further enhancing the heat dissipation effect when the rotor is running.

[0014] (2) In this utility model, the magnetic circuit resistance is increased by setting hollow grooves, which blocks the closed eddy current path in the permanent magnet and reduces the eddy current generation area. At the same time, the symmetrical semi-circular protrusions set on the left and right sides can further increase the magnetic circuit resistance, significantly reduce the eddy current generation area, and improve the service life of the motor rotor.

[0015] In summary, this rotor has the advantages of enhancing heat dissipation during rotor operation, reducing eddy current losses in the magnets, and increasing rotor service life, especially in the field of motor rotor processing technology. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2This is a schematic diagram of the heat dissipation sleeve structure in this utility model.

[0019] Figure 3 This is a schematic diagram of the hollowed-out groove structure in this utility model. Detailed Implementation

[0020] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0021] Example 1

[0022] like Figures 1 to 3 As shown, this utility model provides a high-speed motor rotor that can reduce eddy current losses in magnets: it includes a rotor core 1, the rotor core 1 has an inner hole 2 inside, the inner hole 2 is used to install the rotating shaft, the outer periphery of the inner hole 2 is uniformly provided with hollow grooves 3, the hollow grooves 3 are mainly to increase magnetic circuit resistance and reduce eddy current generation, the outer periphery of the hollow grooves 3 is uniformly provided with embedding grooves 4, the embedding grooves 4 are all embedded with permanent magnets, and the rotor core 1 is provided with a heat dissipation sleeve 5.

[0023] Furthermore, the heat dissipation sleeve 5 is uniformly provided with semi-circular grooves 51 on its outer side. The semi-circular grooves 51 have an important heat dissipation function. When the high-speed motor rotor rotates, it will generate a lot of heat. The heat will be dissipated from the high-temperature rotor to the surrounding environment. The semi-circular grooves 51 uniformly provided on the outer side of the heat dissipation sleeve 5 can increase the overall heat dissipation surface area, and the heat generated by the rotor can be transferred to the surrounding air more quickly. The heat dissipation sleeve 5 is uniformly provided with through holes 52 inside.

[0024] Furthermore, the through hole 52 extends through the entire heat dissipation sleeve 5 from front to back. When the rotor rotates, the surrounding air will flow accordingly. The through hole 52 allows air to circulate in the through hole 52, further enhancing the heat dissipation effect.

[0025] Furthermore, the heat dissipation sleeve 5 is made entirely of carbon fiber. Carbon fiber has good thermal conductivity and high strength. Good thermal conductivity helps to quickly transfer the heat generated by the rotor core 1 to the surface of the heat dissipation sleeve 5, while high strength ensures that the heat dissipation sleeve 5 will not easily deform or be damaged under the drive of the high-speed rotating rotor, thereby ensuring the stability and reliability of the heat dissipation structure.

[0026] Furthermore, the hollowed-out groove 3 has semi-circular protrusions 31 on both the left and right sides. The hollowed-out groove 3 changes the path of the magnetic circuit, making the magnetic circuit more tortuous, thereby increasing the magnetic resistance of the magnetic circuit. The semi-circular protrusions 31 further increase the tortuosity of the magnetic circuit, making the magnetic resistance of the magnetic circuit even greater. When the magnetic field propagates in the permanent magnet and the rotor core 1, it will undergo more complex refraction and scattering when it encounters the semi-circular protrusions 31, further disrupting the formation conditions of the closed eddy current path. In this way, the area of ​​eddy current generation will be significantly reduced, thereby reducing the eddy current loss of the magnet.

[0027] Furthermore, the semi-circular protrusions 31 are symmetrically arranged and connected with the hollowed-out grooves 3, penetrating the rotor core 1 from front to back.

[0028] Working process: First, when the motor is powered on and started, the permanent magnet generates a constant magnetic field in the embedded slot 4. While the rotor rotates at high speed, the hollow slot 3 increases the magnetic resistance of the magnetic circuit, forcing the magnetic field path to be tortuous and blocking the formation of closed eddy current paths in the permanent magnet. At the same time, the symmetrical semi-circular protrusion 31 further increases the magnetic resistance, causing the magnetic field to scatter in the iron core, reducing the eddy current generation area to a local area and significantly reducing eddy current loss.

[0029] Secondly, when the high-speed motor rotor rotates, it generates a large amount of heat, which dissipates from the high-temperature rotor into the surrounding environment. The semi-circular grooves 51 evenly distributed on the outer side of the heat dissipation sleeve 5 increase the overall heat dissipation surface area, allowing the heat generated by the rotor to be transferred to the surrounding air more quickly. Simultaneously, the through holes 52 allow air to circulate within them, further enhancing the heat dissipation effect.

[0030] In the description of this utility model, it should be understood that the terms "front and back", "left and right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0031] Of course, those skilled in the art should understand that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be understood as a limitation on the quantity.

[0032] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art under the technical guidance of this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A high-speed motor rotor that can reduce eddy current losses in magnets, characterized in that: The rotor core (1) includes an inner hole (2) inside the rotor core (1), and a hollow groove (3) is uniformly provided around the inner hole (2). An insert groove (4) is uniformly provided around the hollow groove (3). A permanent magnet is embedded inside the insert groove (4), and a heat dissipation sleeve (5) is provided on the outside of the rotor core (1).

2. A high-speed motor rotor that can reduce eddy current losses in magnets according to claim 1, characterized in that, The heat dissipation sleeve (5) has a semi-circular groove (51) uniformly provided on the outer side, and a through hole (52) uniformly provided inside the heat dissipation sleeve (5).

3. A high-speed motor rotor that can reduce eddy current losses in magnets according to claim 2, characterized in that, The through hole (52) runs through the entire heat dissipation sleeve (5) from front to back.

4. A high-speed motor rotor according to claim 1 that can reduce eddy current losses in magnets, characterized in that, The heat dissipation sleeve (5) is made of carbon fiber.

5. A high-speed motor rotor according to claim 1 that can reduce eddy current losses in magnets, characterized in that, The hollow groove (3) has semi-circular protrusions (31) on both the left and right sides.

6. A high-speed motor rotor according to claim 5, characterized in that, The semi-circular protrusion (31) is symmetrically arranged and connected with the hollowed-out groove (3), penetrating the rotor core (1) from front to back.

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