Motor rotor, motor and energy storage flywheel

Abstract

The utility model belongs to the technical field of energy storage flywheels, and particularly discloses a motor rotor, a motor and an energy storage flywheel. The motor rotor comprises an iron core, a permanent magnet assembly, a first annular sheath, a magnetic ring sleeve and a second annular sheath. The iron core is provided with a mounting hole used for being mounted on a rotating shaft. The permanent magnet assembly is arranged on the peripheral surface of the iron core; the first annular sheath is arranged on the peripheral surface of the permanent magnet assembly to protect the permanent magnet assembly; the magnetic ring sleeve is arranged on the peripheral surface of the first annular sheath and is used for reducing eddy current loss; and the second annular sheath is arranged on the outer peripheral surface of the magnetic ring sleeve. Heat generated in the working process can be reduced, and the overall strength is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage flywheels, and in particular relates to a motor rotor, a motor and an energy storage flywheel. Background Art

[0002] To improve efficiency and reduce losses, the energy storage flywheel's flywheel rotor operates within a vacuum chamber and utilizes magnetic bearings, eliminating any contact between the flywheel rotor and the inner wall of the vacuum chamber, significantly reducing losses. Because the flywheel rotor and motor rotor are coaxially arranged as a single unit, the motor rotor also operates in a vacuum. Heat dissipation from the motor rotor can only be conducted through thermal radiation, which has low efficiency and results in low single-unit power. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, an embodiment of the present invention provides a motor rotor that can reduce the heat generated during operation and improve overall strength.

[0004] An embodiment of the present utility model further provides a motor.

[0005] The embodiment of the present utility model further provides an energy storage flywheel.

[0006] The motor rotor of an embodiment of the present utility model includes: an iron core, the iron core having a mounting hole for mounting on a rotating shaft; a permanent magnet assembly, the permanent magnet assembly being arranged on the outer circumferential surface of the iron core; a first annular sleeve, the first annular sleeve being arranged on the outer circumferential surface of the permanent magnet assembly to form a protection for the permanent magnet assembly; a magnetic ring sleeve, the magnetic ring sleeve being arranged on the outer circumferential surface of the first annular sleeve, the magnetic ring sleeve being used to reduce eddy current loss; and a second annular sleeve, the second annular sleeve being arranged on the outer circumferential surface of the magnetic ring sleeve.

[0007] It can be understood that a permanent magnet assembly is arranged on the outside of the iron core, and a magnetic field is generated by the permanent magnet assembly to make the motor rotate, generate force or generate electricity, etc. A first annular sleeve is arranged on the outside of the permanent magnet assembly, and the permanent magnet assembly can be fixed and supported by the first annular sleeve, which is beneficial to improving the overall strength. By arranging a magnetic ring sleeve on the outside of the first annular sleeve, eddy current loss is reduced, heat generation can be reduced, and the efficiency of the motor is improved. A second annular sleeve is arranged on the outside of the magnetic ring sleeve, and its internal structure can be protected by the second annular sleeve, which is beneficial to improving the overall strength and improving safety during high-speed operation.

[0008] In this embodiment, the permanent magnet assembly includes: a magnetic steel, wherein a plurality of the magnetic steels are provided, and the plurality of the magnetic steels are arranged in sequence along the outer peripheral surface of the iron core; a magnetic isolation member, wherein the magnetic isolation member includes at least one pair of magnetic isolation blocks, and each pair of magnetic isolation blocks is symmetrically arranged between the plurality of the magnetic steels.

[0009] In this embodiment, the magnetic steel is bonded to the iron core; and / or the magnetic isolation block is bonded to the iron core or connected by bolts.

[0010] In this embodiment, a positioning plane formed by removing material along the tangent direction of the iron core is provided at a position of the outer cylindrical surface of the iron core corresponding to the magnetic isolation block.

[0011] In this embodiment, the magnetic ring includes a plurality of silicon steel sheets, and the plurality of silicon steel sheets are stacked along the axial direction of the iron core.

[0012] In this embodiment, the first annular sleeve is interference fit with the permanent magnet assembly.

[0013] In this embodiment, the second annular sleeve and the magnetic annular sleeve are interference fit.

[0014] In this embodiment, the second annular sheath is a carbon fiber sheath; and / or the first annular sheath is a high-temperature alloy sheath.

[0015] The motor of the embodiment of the present invention comprises a rotating shaft and the motor rotor described above, wherein the iron core is mounted on the rotating shaft through the mounting hole.

[0016] The energy storage flywheel of the embodiment of the present utility model includes a shell, a flywheel rotor and the above-mentioned motor, wherein the shell has a vacuum chamber, the flywheel rotor is arranged on the outer peripheral surface of the rotating shaft, and the flywheel rotor and the motor are both arranged in the vacuum chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of the motor rotor and the rotating shaft of an embodiment of the present utility model.

[0018] Reference numerals:

[0019] 1. Iron core; 11. Positioning plane; 2. Permanent magnet assembly; 21. Magnet; 22. Magnetic isolation member; 3. First annular sleeve; 4. Magnetic annular sleeve; 5. Second annular sleeve; 6. Rotating axis. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0021] In this embodiment, if Figure 1 As shown, the motor rotor includes an iron core 1, a permanent magnet assembly 2, a first annular sleeve 3, a magnetic sleeve 4 and a second annular sleeve 5. The iron core 1 has a mounting hole for mounting on a rotating shaft 6; the permanent magnet assembly 2 is arranged on the outer circumference of the iron core 1; the first annular sleeve 3 is arranged on the outer circumference of the permanent magnet assembly 2 to form a protection for the permanent magnet assembly 2; the magnetic sleeve 4 is arranged on the outer circumference of the first annular sleeve 3, and the magnetic sleeve 4 is used to reduce eddy current loss; the second annular sleeve 5 is arranged on the outer circumference of the magnetic sleeve 4.

[0022] Specifically, the iron core 1 can be formed by stacking a plurality of alloy steel sheets. For example, it can be a 25Cr2Ni4MoV alloy steel sheet. The stacking direction of the alloy steel sheets is consistent with the axial direction of the mounting hole. When an alternating current passes through the iron core 1, an alternating magnetic field is generated in the iron core 1, thereby inducing eddy currents. The thin layer structure of the alloy steel sheet can reduce the path of the eddy current, thereby reducing eddy current losses. In addition, the iron core 1 is a stacked structure, which increases the surface area of the material, is conducive to heat dissipation, and reduces temperature rise.

[0023] It can be understood that a permanent magnet assembly 2 is arranged outside the iron core 1, and a magnetic field is generated by the permanent magnet assembly 2 to make the motor rotate, generate force or generate electricity, etc. A first annular sleeve 3 is arranged outside the permanent magnet assembly 2, and the permanent magnet assembly 2 can be fixedly supported by the first annular sleeve 3, which is beneficial to improving the overall strength. By arranging a magnetic ring sleeve 4 outside the first annular sleeve 3, eddy current loss is reduced, heat generation can be reduced, and the efficiency of the motor is improved. A second annular sleeve 5 is arranged outside the magnetic ring sleeve 4, and its internal structure can be protected by the second annular sleeve 5, which is beneficial to improving the overall strength and improving the safety during high-speed operation.

[0024] In this embodiment, if Figure 1 As shown, the permanent magnet assembly 2 includes a magnet 21 and a magnetic isolation member 22. There are multiple magnets 21, and the multiple magnets 21 are arranged in sequence along the outer circumferential surface of the iron core 1; the magnetic isolation member 22 includes at least one pair of magnetic isolation blocks, and each pair of magnetic isolation blocks is symmetrically arranged between the multiple magnets 21.

[0025] Specifically, the number of magnets 21 is an even number and can be arranged symmetrically in space, which helps to establish a uniform magnetic field, thereby improving the smoothness and efficiency of the motor operation. For example, the number of magnets 21 can be eight or ten, etc. The number of magnets 21 can be set as needed and is not limited here.

[0026] Each pair of magnetic isolation blocks includes two magnetic isolation blocks. The magnetic isolation member 22 may include one, two, or three pairs of magnetic isolation blocks. One or more pairs of magnetic isolation blocks evenly divide the multiple magnets 21. The paired magnetic isolation blocks maintain the symmetry of the magnetic circuit structure, forming a balanced magnetic field distribution, which helps the motor run more smoothly.

[0027] It will be appreciated that by providing multiple magnets 21 and sequentially placing them along the outer circumference of the core 1, a uniform magnetic field can be generated. By placing magnetic spacers 22 in pairs between the magnets 21, the magnetic field can be divided by the spacers 22, thereby reducing magnetic field leakage and effectively concentrating the magnetic force. Furthermore, since the magnets 21 may generate heat due to eddy currents, the magnetic spacers can also serve as thermal insulation, preventing direct heat transfer between the magnets 21.

[0028] In this embodiment, the magnetic steel 21 is bonded to the iron core 1 .

[0029] For example, the magnet 21 can be bonded to the iron core 1 by resin glue. The resin glue has a strong bonding force, which can make the magnet 21 stably fixed during the operation of the motor and not easy to loosen or fall off. The thermal expansion coefficient of the resin glue can be adjusted to be close to the material of the magnet 21. In this way, when the temperature changes, the stress at the bonding interface is small, reducing the risk of damage caused by thermal stress. Of course, the magnet 21 can also be bonded to the iron core 1 by other glues as needed, and there is no restriction here. In addition, the connection method between the magnet 21 and the iron core 1 is not limited to bonding. It can also be connected by pre-setting an installation groove on the iron core 1 and embedding the magnet 21 into the installation groove.

[0030] In this embodiment, the magnet 21 is connected to the iron core 1 by bonding, which can facilitate the connection between the magnet 21 and the iron core 1, reduce the air gap in the magnetic circuit, help improve the magnetic flux density, enhance the output torque and efficiency of the motor, reduce the possibility of eddy currents under the action of the alternating magnetic field, and reduce energy loss.

[0031] In this embodiment, the magnetic isolation block is bonded to the iron core 1 .

[0032] Similarly, the magnetic isolation block can be bonded to the iron core 1 by resin glue. The magnetic isolation block can be bonded to the iron core 1 synchronously with the magnet 21. Connecting the magnetic isolation block to the iron core 1 by bonding can facilitate the connection between the magnetic isolation block and the iron core 1. Of course, the connection method between the magnetic isolation block and the iron core 1 is not used to limit the present invention. For example, the magnetic isolation block can also be connected to the iron core 1 by bolts. Specifically, the magnetic isolation block is provided with countersunk holes arranged along its radial direction, and the iron core 1 is provided with threaded holes corresponding to the magnetic isolation block. The bolts pass through the countersunk holes and are threadedly connected to the iron core 1.

[0033] In this embodiment, the magnet 21 is a neodymium iron boron magnet, a samarium cobalt alloy magnet, an aluminum nickel cobalt magnet, or a ferrite magnet.

[0034] Specifically, the magnet 21 is made of permanent magnet material to generate a magnetic field. Therefore, the magnet 21 being a neodymium iron boron magnet, a samarium cobalt alloy magnet, an aluminum nickel cobalt magnet or a ferrite magnet does not limit the present invention.

[0035] It is understandable that the magnet 21 is made of a material with stable magnetic properties, a large magnetic energy product, and the ability to generate a stronger magnetic field under the same volume, which is beneficial to reducing the volume of the motor rotor.

[0036] In this embodiment, the magnetic isolation member 22 is made of stainless steel.

[0037] The magnetic isolation piece 22 is made of non-magnetic material and is used to divide the magnetic field. The magnetic isolation piece 22 can also be made of other materials as needed, which is not limited here.

[0038] Stainless steel is resistant to high temperatures and corrosion, which helps to ensure the reliability of the magnetic isolation member 22 under harsh working conditions.

[0039] In this embodiment, a positioning plane 11 formed by removing material along the tangential direction of the core 1 is provided at a position on the outer cylindrical surface of the core 1 corresponding to the magnetic isolation block.

[0040] By providing the positioning plane 11, it is possible to facilitate positioning of the magnetic isolation block and increase the torque.

[0041] In this embodiment, the magnetic ring 4 includes a plurality of silicon steel sheets, which are stacked along the axial direction of the iron core 1 .

[0042] For example, the shape of each silicon steel sheet that makes up the magnetic ring sleeve 4 matches the cross-sectional shape of the magnetic sleeve. The magnetic ring sleeve 4 is formed by stacking the silicon steel sheets. After the stacking is completed, the magnetic ring sleeve 4 does not need to be processed again, making the magnetic ring sleeve 4 easier to process.

[0043] It is understandable that the magnetic ring sleeve 4 is formed by stacking a plurality of silicon steel sheets. The stacked silicon steel sheets can limit the cross-sectional area of eddy current circulation, reduce the generation of eddy current, thereby reducing eddy current loss and heat generation.

[0044] In this embodiment, the first annular sleeve 3 and the permanent magnet assembly 2 are interference fit.

[0045] Specifically, the inner wall of the first annular sleeve 3 and the outer circumferential surface of the permanent magnet assembly 2 are interference fit.

[0046] It can be understood that the first annular sheath 3 and the permanent magnet assembly 2 have an interference fit, which can more stably fix the permanent magnet assembly 2 and is conducive to improving the overall strength.

[0047] In this embodiment, the second annular sleeve 5 and the magnetic annular sleeve 4 are interference fit.

[0048] Specifically, the inner wall of the second annular sleeve 5 and the outer circumferential surface of the magnetic annular sleeve 4 are interference fit.

[0049] It can be understood that the interference fit between the second annular sleeve 5 and the magnetic annular sleeve 4 can more stably fix the structure inside the second annular sleeve 5, which is conducive to improving the overall strength.

[0050] In this embodiment, the second annular sheath 5 is a carbon fiber sheath.

[0051] Setting the second annular sheath 5 as a carbon fiber sheath can reduce the weight of the motor rotor, thereby reducing inertia, improving acceleration performance and energy efficiency, and has high strength and toughness, can withstand high impact, and better protect its internal structure. In addition, the carbon fiber has a low thermal expansion coefficient and small deformation, which is conducive to maintaining good operating accuracy and stability of the electronic rotor.

[0052] In this embodiment, the first annular sheath 3 is a high-temperature alloy sheath.

[0053] It is understandable that high-temperature alloys can maintain good mechanical properties and stability in high-temperature environments, which is conducive to maintaining efficient operation of electronic rotors, and have good corrosion and oxidation resistance, which is conducive to improving overall service life. High-temperature alloys have high strength and toughness, which can better fix their internal structures.

[0054] This embodiment also provides an assembly method for the electronic rotor, comprising the following steps:

[0055] S10, installing the permanent magnet assembly 2 on the iron core 1 to form a first assembly.

[0056] Specifically, the permanent magnet assembly 2 includes a plurality of magnetic steels 21 and a plurality of magnetic shielding members 22, which are sequentially bonded to the outer circumference of the core 1. The magnetic steels 21 and the magnetic shielding members 22 can be bonded to the core 1 by resin.

[0057] S20, installing the magnetic ring sleeve 4 on the outer peripheral surface of the first annular sleeve 3 to form a second assembly.

[0058] Specifically, the first annular sleeve 3 is a high-temperature alloy sleeve, and the magnetic annular sleeve 4 is formed by stacking multiple silicon steel sheets. When the magnetic sleeve is installed on the outer peripheral surface of the first annular sleeve 3, the magnetic annular sleeve 4 and the first annular sleeve 3 can be heated to a first preset temperature. The first annular sleeve 3 and the magnetic annular sleeve 4 expand when heated, which can facilitate installation. For example, the first preset temperature range can be 10°C to 20°C. Of course, when the first annular sleeve 3 and the magnetic annular sleeve 4 are made of other materials, the specific value of the first preset temperature can be adjusted according to the material of the magnetic annular sleeve 4 and the first annular sleeve 3, and is not limited here.

[0059] S30, installing the second annular sheath 5 on the outer peripheral surface of the magnetic sleeve of the second assembly to form a third assembly.

[0060] In step S20, after the magnetic annular sleeve 4 and the first annular sleeve 3 are heated and assembled to form a second assembly, the second assembly needs to be cooled to a second predetermined temperature. For example, if the second annular sleeve 5 is a carbon fiber sleeve, the second predetermined temperature may be 100°C. After cooling to the second predetermined temperature, the second assembly cools and shrinks, and the second annular sleeve 5 is then installed on the second assembly, facilitating installation of the second annular sleeve 5.

[0061] S40: Install the third assembly body on the outer peripheral surface of the first assembly body.

[0062] Specifically, before the third assembly is mounted on the outer surface of the first assembly, the third assembly can be heated to a third preset temperature. The third assembly expands upon heating, thereby facilitating its installation on the exterior of the permanent magnet assembly 2 of the second assembly. After installation, the third assembly is allowed to cool naturally. For example, the third preset temperature can be 100°C. Similarly, the specific value of the third preset temperature can be set based on the materials of the components in the third assembly and is not limited here.

[0063] In this embodiment, the motor includes a rotating shaft 6 and the above-mentioned motor rotor, and the iron core 1 is mounted on the rotating shaft 6 through a mounting hole.

[0064] Specifically, when installing the motor rotor and rotating shaft 6, the electronic rotor can be heated to a fourth preset temperature before being installed on the rotating shaft 6. For example, the fourth preset temperature can be 100°C, and the fourth preset temperature can be adjusted as needed, without limitation. The iron core 1 and rotating shaft 6 have an interference fit.

[0065] In this embodiment, the energy storage flywheel includes a shell, a flywheel rotor and the above-mentioned motor. The shell has a vacuum chamber. The flywheel rotor is arranged on the outer peripheral surface of the rotating shaft 6, and both the flywheel rotor and the motor are arranged in the vacuum chamber.

[0066] It is understandable that both the flywheel rotor and the motor operate in a vacuum chamber, which reduces losses. By setting up the above-mentioned motor, eddy current losses can be reduced, heat generation can be reduced, and the loss of the energy storage flywheel can be improved.

[0067] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0069] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0070] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0071] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0072] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A motor rotor, characterized in that: include: an iron core having a mounting hole for mounting on a rotating shaft; A permanent magnet assembly, the permanent magnet assembly being arranged on the outer peripheral surface of the iron core; a first annular sheath, wherein the first annular sheath is arranged on the outer peripheral surface of the permanent magnet assembly to protect the permanent magnet assembly; A magnetic ring sleeve is provided on the outer peripheral surface of the first annular sleeve, and is used to reduce eddy current loss; A second annular sleeve is arranged on the outer circumference of the magnetic annular sleeve.

2. The motor rotor according to claim 1, characterized in that: The permanent magnet assembly comprises: Magnetic steel, wherein a plurality of the magnetic steels are provided, and the plurality of the magnetic steels are sequentially arranged along the outer circumference of the iron core; The magnetic isolation member includes at least one pair of magnetic isolation blocks, and each pair of magnetic isolation blocks is symmetrically arranged between the plurality of magnetic steels.

3. The motor rotor according to claim 2, characterized in that: The magnetic steel is bonded to the iron core; And / or, the magnetic isolation block is bonded to the iron core or connected with bolts.

4. The motor rotor according to claim 2, characterized in that: A positioning plane formed by removing material along the tangent direction of the iron core is provided on the outer cylindrical surface of the iron core at a position corresponding to the magnetic isolation block.

5. The motor rotor according to claim 1, characterized in that: The magnetic ring sleeve includes a plurality of silicon steel sheets, and the plurality of silicon steel sheets are stacked along the axial direction of the iron core.

6. The motor rotor according to claim 1, characterized in that: The first annular sleeve is interference-fitted with the permanent magnet assembly.

7. The motor rotor according to claim 1, characterized in that: The second annular sleeve and the magnetic sleeve are interference fit.

8. The motor rotor according to claim 1, characterized in that: The second annular sheath is a carbon fiber sheath; And / or, the first annular sheath is a high-temperature alloy sheath.

9. A motor, characterized in that: The motor comprises a rotating shaft and the motor rotor according to any one of claims 1 to 8, wherein the iron core is mounted on the rotating shaft through the mounting hole.

10. An energy storage flywheel, characterized in that: The invention comprises a housing, a flywheel rotor and the motor according to claim 9, wherein the housing has a vacuum chamber, the flywheel rotor is arranged on the outer peripheral surface of the rotating shaft, and the flywheel rotor and the motor are both arranged in the vacuum chamber.

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