A carbon fiber bound permanent magnet motor rotor can

Abstract

The utility model relates to the field of permanent magnet motor rotor sheath, disclose a kind of carbon fiber bandaging's permanent magnet motor rotor sheath, including carbon fiber cladding layer a, carbon fiber cladding layer b is provided in carbon fiber cladding layer a inside, carbon fiber cladding layer b is fixedly installed with inner layer by support assembly;The support assembly includes connecting frame.In the utility model, carbon fiber cladding layer a uses ±15 ° winding angle, enhances axial tensile capacity, carbon fiber cladding layer b uses ±45 ° winding angle, strengthens radial shear performance, avoid the fragmentation or displacement of magnetic steel due to excessive stress, simultaneously, carbon fiber material density is low, non-magnetic and thermal expansion coefficient is small, compared with traditional metal sheath, both reduce the rotor deadweight to reduce energy consumption, also avoid the interference to magnetic field distribution, still can reduce structural deformation caused by temperature change, ensure the stability of sheath and magnetic steel cooperation gap.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor rotor sheaths, and more particularly to a permanent magnet motor rotor sheath bound with carbon fiber. Background Technology

[0002] In the modern industrial field, permanent magnet motors are widely used in key industries such as new energy vehicles, aerospace, high-end equipment manufacturing, and wind power generation due to their significant advantages such as high efficiency, high power density, and high reliability.

[0003] As the core component of a permanent magnet motor, the rotor's operational stability directly determines the motor's overall performance. Under high-speed rotation, the permanent magnets (magnets) on the rotor are subjected to enormous centrifugal forces, which are proportional to the square of the rotational speed. When the speed reaches a certain threshold, the tensile stress on the magnets may exceed their material strength limit, leading to magnet breakage, displacement, or failure, seriously threatening the motor's safe operation. Therefore, equipping the permanent magnets with a reliable protective structure—the rotor sheath—is crucial for ensuring the motor's stable high-speed operation.

[0004] The thermal expansion coefficients of existing metal rotor sheaths differ from those of the rotor itself. During motor operation, temperature changes cause significant thermal deformation, which may alter the fit between the sheath and the magnets, thus affecting the magnets' stability. Furthermore, some metal materials possess magnetic properties, which can interfere with the internal magnetic field distribution of the motor, reducing its magnetic flux density and output power. To address these issues, a carbon fiber-bound permanent magnet motor rotor sheath is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a carbon fiber-bound permanent magnet motor rotor sheath, which aims to solve the problems in the prior art where "the thermal expansion coefficient of the traditional metal rotor sheath does not match the rotor, resulting in thermal deformation that affects the stability of the magnet, and the magnetic interference of some metal materials that reduce the magnetic field and motor performance".

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a permanent magnet motor rotor sheath bound with carbon fiber, comprising a carbon fiber covering layer a, wherein a carbon fiber covering layer b is disposed inside the carbon fiber covering layer a, and an inner layer is fixedly installed on the carbon fiber covering layer b by a support component.

[0007] The support component includes a connecting frame, the inner side of which is fixedly connected to the outer side of the inner layer. Multiple sets of buffer units are fixedly installed on the inner wall of the connecting frame. Rubber rings a are fixedly installed on the outer sides of the upper and lower ends of the connecting frame. Rubber rings b are fixedly installed on the outer side of the middle part of the connecting frame. The connecting frame and the outer side of the rubber rings b are fixedly connected to the inner side of the carbon fiber covering layer b.

[0008] As a further description of the above technical solution:

[0009] The outer side of the connecting frame is uniformly provided with honeycomb-shaped through grooves.

[0010] As a further description of the above technical solution:

[0011] The buffer unit is fixedly installed on the inner wall of the honeycomb groove of the connecting frame.

[0012] As a further description of the above technical solution:

[0013] The buffer unit is configured as a regular hexagon and is made of an elastic composite material.

[0014] As a further description of the above technical solution:

[0015] The carbon fiber cladding layer a and carbon fiber cladding layer b are made of carbon fiber bundles with different winding angles. The winding angle of carbon fiber cladding layer a is ±15°, and the winding angle of carbon fiber cladding layer b is ±45°.

[0016] As a further description of the above technical solution:

[0017] The inner layer is made of a non-magnetic, high-strength alloy material.

[0018] This utility model has the following beneficial effects:

[0019] 1. In this utility model, the carbon fiber sheathing layer a adopts a winding angle of ±15°, which enhances the axial tensile strength, and the carbon fiber sheathing layer b adopts a winding angle of ±45°, which strengthens the radial shear resistance. The two work together to effectively resist the centrifugal force during high-speed rotation, and prevent the magnet from breaking or displacing due to excessive stress. At the same time, the carbon fiber material has low density, is non-magnetic, and has a small coefficient of thermal expansion. Compared with the traditional metal sheath, it not only reduces the rotor's self-weight to reduce energy consumption, but also avoids interference with the magnetic field distribution, and reduces structural deformation caused by temperature changes, ensuring the stability of the fit gap between the sheath and the magnet.

[0020] 2. In this utility model, excellent vibration reduction is achieved through the multi-level buffer design of the support components. The honeycomb-shaped through-slots of the connecting frame and the regular hexagonal buffer unit form the first level of buffer. Utilizing the stress dispersion characteristics of the honeycomb structure and the energy absorption performance of the elastic composite material, the vibration impact during rotor operation can be efficiently absorbed. Rubber rings a and b serve as the second level of buffer, further weakening vibration transmission while enhancing the sealing and compatibility between the connecting frame and the carbon fiber covering layer b. In addition, the inner layer, made of non-magnetic high-strength alloy, is in direct contact with the magnets, providing stable support while avoiding interference with the magnetic field. Together with the outer structure, it ensures the stability and reliability of the motor during high-speed operation. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the overall device in this utility model;

[0022] Figure 2 This is a three-dimensional structural diagram of the disassembled integral device in this utility model;

[0023] Figure 3 This is a three-dimensional structural diagram showing the disassembled connection frame and buffer unit in this utility model.

[0024] Legend:

[0025] 1. Carbon fiber cladding layer a; 2. Carbon fiber cladding layer b; 3. Inner layer; 4. Support component; 41. Connecting frame; 42. Buffer unit; 43. Rubber ring a; 44. Rubber ring b. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Reference Figures 1-3This utility model provides an embodiment of a carbon fiber-bound permanent magnet motor rotor sheath, comprising a carbon fiber covering layer a1, made of carbon fiber bundles with a winding angle of ±15°. This angle design allows it to effectively resist axial tensile stress during high-speed rotor rotation, preventing axial tearing of the sheath due to centrifugal force. Simultaneously, as the outermost structure, its smooth surface reduces air resistance, and the low-density characteristics of carbon fiber further reduce the overall weight of the rotor, improving the high-speed response performance of the motor. Furthermore, its non-magnetic properties avoid interference with the external magnetic field of the motor, ensuring the stability of the magnetic field distribution. A carbon fiber covering layer b2 is provided inside the carbon fiber covering layer a1. The carbon fiber covering layers a1 and b2 are made of carbon fiber bundles with different winding angles: the winding angle of carbon fiber covering layer a1 is ±15°, and the winding angle of carbon fiber covering layer b2 is ±45°. The carbon fiber covering layer b2 is mainly composed of carbon fiber bundles with a ±45° winding angle. This angle provides optimal resistance to radial shear force, effectively counteracting the radial stress generated by the outward expansion of the magnets during rotor rotation and preventing radial deformation of the sheath. Its inner side is directly connected to the support component 4, which can evenly transfer external stress to the connecting frame 41 and avoid local stress concentration. At the same time, together with the carbon fiber covering layer a1, it forms a double-layer protective structure, which significantly improves the overall rigidity and fatigue resistance of the sheath and extends its service life. The carbon fiber covering layer b2 is fixedly installed with the inner layer 3 through the support component 4.

[0028] Reference Figures 1-3 The inner layer 3 is made of a non-magnetic, high-strength alloy material, including titanium alloy or austenitic stainless steel. This material avoids interference with the magnetic field of the magnet and can withstand the direct pressure transmitted by the magnet. Its inner side is tightly fitted to the magnet, and the smooth surface reduces friction and wear between the magnet and the inner layer 3, ensuring the positional accuracy of the magnet during high-speed rotation. The support component 4 includes a connecting frame 41, which is fixedly connected to the outer side of the inner layer 3. The outer side of the connecting frame 41 has uniformly distributed honeycomb-shaped slots. These slots serve as the mounting carrier for the buffer unit 42. The honeycomb structure itself has excellent stress dispersion characteristics, which can evenly transmit radial and axial stress to all sides, avoiding local overload. The inner side of the connecting frame 41 is fixed to the inner layer 3, and the outer side is connected to the carbon fiber covering layer b2 via a rubber ring, forming a transitional structure that combines rigidity and elasticity, reducing stress abrupt changes between different materials.

[0029] Reference Figure 2 and Figure 3Multiple sets of buffer units 42 are fixedly installed on the inner wall of the connecting frame 41. The buffer units 42 are fixedly installed on the inner wall of the honeycomb-shaped through groove of the connecting frame 41. The buffer units 42 are set in a regular hexagonal shape and are made of elastic composite material, namely polyurethane-based composite elastomer. The regular hexagonal design of the buffer units 42 enables them to bear stress evenly from multiple directions. Combined with the high resilience of polyurethane-based composite elastomer, it can efficiently absorb high-frequency vibration and impact load during rotor operation, reduce the transmission of vibration to the magnet and outer carbon fiber layer. At the same time, when installed in the honeycomb through groove, it can also fill the through groove space and enhance the overall structure of the connecting frame 41. To enhance structural strength, rubber rings a43 are fixedly installed on the outer sides of the upper and lower ends of the connecting frame 41, and rubber ring b44 is fixedly installed on the outer side of the middle part of the connecting frame 41. Both rubber rings a43 and b44 are made of silicone rubber resistant to high and low temperatures. Their elastic properties can compensate for the assembly error between the connecting frame 41 and the carbon fiber covering layer b2, and reduce the friction and wear caused by vibration. When the temperature changes, the thermal expansion and contraction characteristics of the rubber can buffer the thermal deformation difference between the connecting frame 41 and the carbon fiber layer, ensuring the stability of the fit. The outer sides of the connecting frame 41 and the rubber ring b44 are fixedly connected to the inner side of the carbon fiber covering layer b2.

[0030] Working Principle: During operation, the rotor rotates at high speed, generating a significant centrifugal force in the permanent magnets. This force exerts axial tensile and radial shear forces on the rotor sheath. The outer carbon fiber cladding layer a1 is made of carbon fiber bundles with a ±15° winding angle. This angle design provides excellent axial tensile strength, effectively resisting the axial tensile force generated during high-speed rotation. The inner carbon fiber cladding layer b2 uses carbon fiber bundles with a ±45° winding angle, enhancing its radial shear resistance and effectively resisting radial shear forces. The two carbon fiber cladding layers work together to effectively prevent the magnets from cracking or displacing due to excessive stress.

[0031] Meanwhile, the low density of carbon fiber material reduces the overall weight of the rotor and lowers energy consumption; its non-magnetic properties avoid interference with the distribution of the magnetic field inside the motor, ensuring magnetic flux density and output power; and the small coefficient of thermal expansion of carbon fiber reduces structural deformation caused by temperature changes, ensuring the stability of the fit gap between the sheath and the magnet.

[0032] The connecting frame 41 of the support component 4 has a honeycomb-shaped through groove on its outer side. The hexagonal buffer unit 42 installed on the inner wall of the through groove is made of polyurethane-based composite elastomer, an elastic composite material. The hexagonal structure can uniformly bear stress from multiple directions. Combined with the energy absorption properties of the elastic composite material, it can efficiently absorb the vibration impact generated during rotor operation, forming the first level of buffer. The rubber rings a43 at the upper and lower ends and the rubber ring b44 in the middle of the outer side of the connecting frame 41 serve as the second level of buffer, further weakening the transmission of vibration. At the same time, it enhances the sealing and compatibility between the connecting frame 41 and the carbon fiber covering layer b2, reduces friction and wear between different materials, and can also buffer the thermal deformation difference between the connecting frame 41 and the carbon fiber layer when the temperature changes, ensuring the stability of the fit.

[0033] The inner layer 3 is made of non-magnetic and high-strength alloy material such as titanium alloy or austenitic stainless steel. It is in direct contact with the magnet, which avoids interference with the magnetic field of the magnet and provides stable support for the magnet, bearing the direct pressure transmitted by the magnet. The smooth surface reduces friction and wear between the magnet and the inner layer 3, ensuring the positional accuracy of the magnet when rotating at high speed.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A carbon fiber bound permanent magnet electric machine rotor can, comprising a carbon fiber cladding layer a (1), characterized in that: The carbon fiber cladding layer a (1) is provided with a carbon fiber cladding layer b (2) inside, and the carbon fiber cladding layer b (2) is fixedly installed with an inner layer (3) by a support component (4); The support component (4) includes a connecting frame (41), the inner side of which is fixedly connected to the outer side of the inner layer (3). Multiple sets of buffer units (42) are fixedly installed on the inner wall of the connecting frame (41). Rubber rings a (43) are fixedly installed on the outer sides of the upper and lower ends of the connecting frame (41). Rubber rings b (44) are fixedly installed on the outer side of the middle part of the connecting frame (41). The connecting frame (41) and the rubber rings b (44) are fixedly connected to the inner side of the carbon fiber covering layer b (2).

2. A carbon fiber bound permanent magnet electric machine rotor can according to claim 1, characterized in that: The outer side of the connecting frame (41) is uniformly provided with honeycomb-shaped through grooves.

3. A carbon fiber wrapped permanent magnet electric machine rotor can according to claim 1, characterized in that: The buffer unit (42) is fixedly installed on the inner wall of the honeycomb groove of the connecting frame (41).

4. A carbon fiber wrapped permanent magnet electric machine rotor can according to claim 1, characterized in that: The buffer unit (42) is configured as a regular hexagon and is made of an elastic composite material.

5. A carbon fiber wrapped permanent magnet electric machine rotor can according to claim 1, characterized in that: The carbon fiber cladding layer a(1) and carbon fiber cladding layer b(2) are made of carbon fiber bundles with different winding angles. The winding angle of carbon fiber cladding layer a(1) is ±15° and the winding angle of carbon fiber cladding layer b(2) is ±45°.

6. A carbon fiber wrapped permanent magnet electric machine rotor can according to claim 1, characterized in that: The inner layer (3) is made of a non-magnetic and high-strength alloy material.

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