Rotor punching sheet of high-rotating-speed motor

Abstract

The utility model discloses a high rotating speed motor rotor punching sheet, comprising a silicon steel sheet body, a plurality of arc-shaped projections arranged on the outer peripheral surface of the silicon steel sheet body, flat magnetic grooves arranged on the silicon steel sheet body corresponding to the inner sides of the arc-shaped projections, air grooves arranged at two ends of the flat magnetic grooves, and a shaft hole arranged at the central position of the silicon steel sheet body. The hole edge of the shaft hole is provided with a plurality of concave positions, and lightening holes and balancing holes are formed in the peripheral positions corresponding to the shaft hole. A ventilation recess is formed between two adjacent arc-shaped projections, so that the temperature of the rotor punching sheet and the magnetic steel can be effectively reduced. Moreover, the arc-shaped protrusions can reduce the harmonic component of the air gap, reduce the torque pulsation, and enhance the structural strength of the stator punching sheet. The flat magnetic grooves are used for inserting the magnetic steel, and air can flow through the air grooves at the two ends of the flat magnetic grooves to assist in heat dissipation, so that the rotor is subjected to heat dissipation in the operation process, and the operation performance of the motor is ensured. Meanwhile, the concave position is arranged, an air channel is added, the heat dissipation effect is further improved, and the temperature of the motor during operation can be reduced; the balance holes can effectively keep dynamic balance of the rotor, and vibration and noise are reduced. The lightening holes not only reduce the weight of the rotor, but also facilitate the improvement of the efficiency of the motor and the reduction of energy consumption, especially at a high rotating speed, the influence of mass on the balance and high-speed operation of the rotor is reduced, and the high-rotating-speed performance of the rotor is improved.

Description

High-speed motor rotor laminations Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a high-speed motor rotor lamination used in motors. Background Technology

[0002] In existing permanent magnet motor structures, holes need to be opened on the rotor laminations to embed the magnets. For example, utility model publication "CN202475207U," entitled "An Improved Structure of a Permanent Magnet Motor," discloses an improved structure for a permanent magnet motor, which includes a stator core and a rotor core. The rotor core has six permanent magnets, but it is circular in shape, lacks internal heat dissipation holes, and is a solid structure, which is detrimental to dynamic balance and energy efficiency improvement under high-speed conditions. With the increasing demand for high-speed motors in the industrial sector, the limitations of traditional rotor core laminations in terms of heat dissipation performance, magnetic circuit optimization, and lightweight design are gradually becoming apparent. For instance, the heat dissipation design of rotor core laminations largely relies on natural convection through the shaft holes, resulting in a limited heat dissipation area. This is insufficient to effectively dissipate the heat generated during generator operation, especially under high-speed conditions. Prolonged high-load operation can easily lead to excessive temperature rise, causing localized demagnetization or structural deformation, affecting the motor's lifespan and reliability. Therefore, improving the design of the rotor heat dissipation structure is of positive significance for improving product performance. Summary of the Invention

[0003] To address the aforementioned shortcomings, the purpose of this utility model is to provide a high-speed motor rotor lamination with a reasonable structural design and good heat dissipation effect.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0005] A high-speed motor rotor lamination includes a silicon steel sheet. The outer circumferential surface of the silicon steel sheet has several arc-shaped protrusions. A flat magnetic groove is provided on the silicon steel sheet corresponding to the inner position of the arc-shaped protrusions. Air grooves are provided at both ends of the flat magnetic groove. A shaft hole is provided at the center of the silicon steel sheet. Several recesses are provided around the edge of the shaft hole for heat dissipation. Weight-reducing holes, symmetrically arranged around the periphery of the shaft hole and matching the number of arc-shaped protrusions, are provided. Balance holes are provided on the silicon steel sheet.

[0006] As a preferred embodiment of this utility model, the balancing hole is rectangular in shape, and the four corners of the rectangle are rounded to avoid stress concentration at right angles, improve the fatigue strength of the hole edge, and extend the high-cycle fatigue life.

[0007] As a preferred embodiment of this utility model, the recess is semi-circular in shape, which increases the cross-sectional area of ​​the air duct, facilitates air circulation, and improves heat dissipation efficiency.

[0008] As a preferred embodiment of this utility model, the number of recesses is five, which further improves the heat dissipation effect.

[0009] As a preferred embodiment of this utility model, the weight-reducing hole is polygonal in shape, which reduces weight while ensuring the structural stability of the rotor and facilitates air circulation and heat dissipation.

[0010] As a preferred embodiment of this utility model, the weight-reducing hole is pentagonal in shape, and the five corners of the pentagon are rounded to reduce stress concentration.

[0011] As a preferred embodiment of this utility model, the bottom edge of the pentagonal shape is arched in an arc shape, which enhances the structural strength of the weight-reducing hole.

[0012] As a preferred embodiment of this utility model, the bottom edges of the flat magnetic groove are recessed downwards at both ends to form a curved portion, which effectively avoids stress concentration, reduces fatigue damage to the magnetic groove during use, and ensures the long-term stability and reliability of the rotor.

[0013] As a preferred embodiment of this utility model, the corners of the flat magnetic groove and the air groove are rounded to reduce stress concentration caused by sharp corners, reduce cracks or material damage caused by stress concentration, and improve the overall mechanical strength and durability of the rotor.

[0014] The beneficial effects of this utility model are as follows: The utility model has a reasonable structural design. Several arc-shaped protrusions are provided on the outer circumferential surface of the silicon steel sheet, creating ventilation recesses between adjacent arc-shaped protrusions, which effectively reduces the temperature of the rotor laminations and magnets. Furthermore, the arc-shaped protrusions reduce air gap harmonic components, reduce torque pulsation, and enhance the structural strength of the stator laminations. The flat magnetic slots are used to insert magnets, and air grooves at both ends of the flat magnetic slots allow airflow to assist in heat dissipation, enabling the rotor to dissipate heat during operation and ensuring the motor's operating performance. Recesses are also provided to increase air passages, further improving heat dissipation and helping to reduce the temperature during motor operation. The balance holes effectively maintain the rotor's dynamic balance, reducing vibration and noise. The weight-reducing holes not only reduce the rotor's weight but also improve motor efficiency and reduce energy consumption, especially at high speeds, mitigating the impact of mass on rotor balance and high-speed operation, thus improving the rotor's high-speed performance.

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 is a three-dimensional structural diagram of this utility model.

[0017] Figure 2 is a schematic diagram of the main structure of this utility model.

[0018] Figure 3 is an enlarged schematic diagram of the structure of part A in Figure 2. Detailed Implementation

[0019] Referring to Figures 1, 2, and 3, this embodiment provides a high-speed motor rotor lamination, which includes a silicon steel sheet. The outer circumferential surface of the silicon steel sheet has several arc-shaped protrusions 1, and ventilation recesses 2 are formed between adjacent arc-shaped protrusions 1. In this embodiment, the number of arc-shaped protrusions 1 is ten; in other embodiments, the number of arc-shaped protrusions 1 may be eight or other numbers.

[0020] A flat magnetic groove 3 is provided on the silicon steel sheet corresponding to the inner position of the arc-shaped protrusion 1, and the number of the flat magnetic groove 3 is consistent with the number of the arc-shaped protrusion 1.

[0021] The upper ends of the flat magnetic slot 3 are bent downwards to form air slots 4. This allows air to flow through the sides of the flat magnetic slot 3 even after the magnets are inserted, providing auxiliary heat dissipation and ensuring the motor's performance during operation. Preferably, the bottom edges of the flat magnetic slot 3 are recessed to form curved portions 5. These curved portions 5 effectively prevent stress concentration, reduce fatigue damage to the flat magnetic slot 3 during use, ensure the long-term stability and reliability of the rotor, and facilitate applications that increase motor speed.

[0022] Preferably, the corners of the flat magnetic groove 3 and the air groove 4 are rounded to reduce stress concentration caused by sharp corners, reduce cracks or material damage caused by stress concentration, and improve the overall mechanical strength and durability of the rotor.

[0023] The silicon steel sheet has a shaft hole 6 at its center, and the edge of the shaft hole 6 has several recesses 7. In this embodiment, the shape of the recesses 7 is preferably semi-circular, and the number of recesses 7 is preferably five, which can increase the cross-sectional area of ​​the air duct, facilitate air circulation, and improve heat dissipation efficiency.

[0024] A number of weight-reducing holes 8, corresponding to the number of arc-shaped protrusions 1, are provided symmetrically around the periphery of the shaft hole 6. These weight-reducing holes 8 are polygonal in shape, reducing weight while ensuring the structural stability of the rotor and facilitating airflow and heat dissipation. The weight-reducing holes 8 are pentagonal in shape, with rounded corners to reduce stress concentration. Preferably, the bottom edge of the pentagon is arched, enhancing the structural strength of the weight-reducing holes 8.

[0025] A balance hole 9 is provided on the silicon steel sheet. The balance hole 9 is rectangular in shape, with rounded corners at all four corners to avoid stress concentration at right angles, improve the fatigue strength of the hole edge, and extend the high-cycle fatigue life. Specifically, the balance hole 9 is located at the upper middle position of two adjacent weight-reducing holes 8. The balance hole 9 is also located on the lower side of the weight-reducing hole 8 near the recess 7, which can effectively maintain the dynamic balance of the rotor and reduce vibration and noise.

[0026] During production, the rotor laminations of this high-speed motor are stacked to form a rotor. Preferably, the shaft holes 6 of some of the stacked rotor laminations are fitted with the shaft with an interference fit, while the shaft holes 6 of the other part of the rotor laminations are slightly larger than the outer diameter of the shaft, and do not make close contact with the outer surface of the shaft. This reduces friction while ensuring a firm assembly, making it easier to axially insert the shaft and preventing deformation of the shaft due to excessive axial pressure.

[0027] When in operation, the rotor made of the high-speed motor rotor lamination of this utility model can form air channels through the ventilation recess 2, air groove 4, recess 7, balance hole 9 and weight reduction hole 8, which can effectively accelerate air circulation, so that the rotor can dissipate heat during operation, reduce the temperature of the rotor lamination and magnets, and meet the high-speed heat dissipation requirements of the rotor.

[0028] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model. As described in the above embodiments of this utility model, other rotor lamination structures obtained by using the same or similar structures are all within the protection scope of this utility model.

Claims

1. A high-speed motor rotor lamination, comprising a silicon steel sheet body, characterized in that, The outer circumferential surface of the silicon steel sheet is provided with several arc-shaped protrusions. A flat magnetic groove is provided on the silicon steel sheet corresponding to the inner position of the arc-shaped protrusions. Air grooves are provided at both ends of the flat magnetic groove. A shaft hole is provided at the center of the silicon steel sheet. A number of recesses are provided at the edge of the shaft hole. Weight reduction holes are provided in a circular symmetrical pattern around the shaft hole, with the number of holes matching the number of arc-shaped protrusions. Balance holes are provided on the silicon steel sheet.

2. The high-speed motor rotor lamination according to claim 1, characterized in that: The balance hole is rectangular in shape, with rounded corners at all four corners.

3. The high-speed motor rotor lamination according to claim 1, characterized in that: The concave area is semi-circular in shape.

4. The high-speed motor rotor lamination according to claim 1 or 3, characterized in that: The number of recesses is five.

5. The high-speed motor rotor lamination according to claim 1, characterized in that: The weight-reducing hole has a polygonal shape.

6. The high-speed motor rotor lamination according to claim 5, characterized in that: The weight-reducing hole has a pentagonal shape, and the five corners of the pentagon are rounded.

7. The high-speed motor rotor lamination according to claim 6, characterized in that: The base of the pentagonal shape is arched in an arc shape.

8. The high-speed motor rotor lamination according to claim 1, characterized in that: The bottom edges of the flat magnetic groove are recessed downwards at both ends to form a curved section.

9. The high-speed motor rotor lamination according to claim 1, characterized in that: The corners of both the flat magnetic groove and the air groove are rounded.

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