Electric machine rotor, electric machine and flywheel energy storage device

Abstract

The utility model discloses a motor rotor, motor and flywheel energy storage device, motor rotor includes: rotor main part, sheath subassembly, the sheath subassembly includes: low magnetic conductivity sheath and high structural strength sheath, low magnetic conductivity sheath is equipped with in the outside of rotor main part, high structural strength sheath is equipped with in the outside of low magnetic conductivity sheath. Sheath subassembly includes low magnetic conductivity sheath and high structural strength sheath, sheath subassembly structural strength is big, eddy current loss is small, like this not only can solve the problem of rotor main part eddy current loss big, and can shield the eddy current loss in the outermost layer, cooperate heat radiation heat dissipation, can effectively improve the heat dissipation efficiency, make the heat not produce on rotor main part, can reduce the temperature of motor rotor, thereby can improve the operation safety of flywheel full life cycle.

Description

Technical Field

[0001] This utility model relates to the field of flywheel energy storage device technology, and in particular to a motor rotor, a motor, and a flywheel energy storage device. Background Technology

[0002] In related technologies, flywheel energy storage devices mainly operate in a magnetic levitation vacuum environment. The motor rotor is in a vacuum levitation state, and the high-speed rotation of the flywheel generates eddy current losses on the motor rotor. The heat energy generated by the losses is difficult to release, resulting in a high temperature of the motor rotor. This not only limits the charging and discharging capacity of the flywheel, but also has a certain impact on the operational safety of the flywheel throughout its entire life cycle. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a motor rotor that can effectively improve heat dissipation efficiency, prevent heat from being generated on the rotor body, reduce temperature, and thus improve the operational safety of the flywheel throughout its entire life cycle.

[0004] This utility model further proposes an electric motor.

[0005] This utility model further proposes a flywheel energy storage device.

[0006] The motor rotor according to this utility model includes: a rotor body; a sheath assembly, the sheath assembly including: a low permeability sheath and a high structural strength sheath, the low permeability sheath being sleeved on the outside of the rotor body, and the high structural strength sheath being sleeved on the outside of the low permeability sheath.

[0007] According to the present invention, the motor rotor has a sheath assembly comprising a low permeability sheath and a high structural strength sheath. This sheath assembly has high structural strength and low eddy current loss, which not only solves the problem of high eddy current loss in the rotor body, but also shields the eddy current loss on the outermost layer. Combined with heat radiation heat dissipation, it can effectively improve heat dissipation efficiency, prevent heat from being generated on the rotor body, reduce the temperature of the motor rotor, and thus improve the operational safety of the flywheel throughout its entire life cycle.

[0008] In some examples of this utility model, the low magnetic permeability sheath is constructed as a ring structure, and the high structural strength sheath is constructed as a ring structure.

[0009] In some examples of this utility model, the low magnetic permeability sheath is a carbon fiber sheath, and the high structural strength sheath is a metal sheath.

[0010] In some examples of this utility model, the motor rotor further includes a heat-conducting element coated on the outer surface of the metal sheath.

[0011] In some examples of this utility model, the rotor body includes a permanent magnet and a rotor shaft, the permanent magnet is sleeved on the outside of the rotor shaft, and the low permeability sheath is sleeved on the outside of the permanent magnet.

[0012] In some examples of this utility model, the inner diameter of the high structural strength sheath is d1, the outer diameter of the low magnetic permeability sheath is d2, and the diameter of the permanent magnet is d3. The relationship between d1, d2, and d3 is: d1≤d2, d2≤d3.

[0013] The motor according to this utility model includes: a motor stator; and the motor rotor described above, wherein the motor rotor is rotatable around the motor stator.

[0014] In some examples of this utility model, the motor rotor is disposed inside the motor stator, and the motor rotor and the motor stator are spaced apart in the radial direction.

[0015] In some examples of this invention, the space between the motor rotor and the motor stator is set as a vacuum.

[0016] The flywheel energy storage device according to this utility model includes: a flywheel; the motor described above, wherein the flywheel and the motor rotor are driven together.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of the motor rotor according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of a motor according to another embodiment of the present invention.

[0019] Figure label: 1. Motor rotor; 10. Rotor body; 100. Permanent magnet; 101. Rotor shaft; 20. Sheath assembly; 200. Low permeability sheath; 201. High structural strength sheath; 2. Motor; 30. Motor stator. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0021] The following is for reference. Figure 1 and Figure 2 The motor rotor 1 according to an embodiment of the present utility model is described.

[0022] like Figure 1 As shown, the motor rotor 1 according to an embodiment of the present invention includes: a rotor body 10 and a sheath assembly 20. The rotor body 10 is the main body of the motor rotor 1. The rotor body 10 can rotate under the action of the magnetic field generated by the motor stator 30, and can output mechanical torque to realize the conversion of electrical energy into mechanical energy. The sheath assembly 20 can significantly reduce the eddy current loss of the rotor body 10, thereby reducing heat generation and energy loss.

[0023] like Figure 1 and Figure 2 As shown, the sheath assembly 20 includes a low-permeability sheath 200 and a high-structural-strength sheath 201. The low-permeability sheath 200 and the high-structural-strength sheath 201 are components of the sheath assembly 20. The low-permeability sheath 200 can reduce the induced current in the metal conductor by the alternating magnetic field, thereby reducing eddy current losses. The high-structural-strength sheath 201 can provide mechanical protection and structural support.

[0024] like Figure 1 and Figure 2 As shown, a low-permeability sheath 200 is fitted onto the outside of the rotor body 10, and a high-structural-strength sheath 201 is fitted onto the outside of the low-permeability sheath 200. The low-permeability sheath 200, due to its low permeability, can minimize interference with the magnetic field and prevent magnetic field distortion. Secondly, it provides the first layer of constraint for the rotor body 10, preventing direct exposure. Furthermore, it significantly reduces eddy current losses and heat generation in the rotor body 10, and can quickly dissipate the heat generated by the rotor body 10. The high-structural-strength sheath 201, fitted onto the outside of the low-permeability sheath 200, can withstand most of the centrifugal stress during high-speed rotation. This ensures the structural safety of the rotor body 10 at its maximum speed. Secondly, it improves the overall rigidity and deformation resistance of the rotor body 10. In addition, it prevents the low-permeability sheath 200 from being damaged by external physical forces. By setting the low-permeability sheath 200 and the high-structural-strength sheath 201, not only can the problem of high eddy current loss in the rotor body 10 be solved, but the eddy current loss can also be shielded on the outermost layer. Combined with heat radiation heat dissipation, the heat dissipation efficiency can be effectively improved, so that heat will not be generated on the rotor body 10, and the temperature of the motor rotor 1 can be reduced, thereby improving the operational safety of the flywheel throughout its entire life cycle.

[0025] Therefore, the sheath assembly 20 includes a low-permeability sheath 200 and a high-structural-strength sheath 201. At this time, the sheath assembly 20 has high structural strength and low eddy current loss. This not only solves the problem of high eddy current loss in the rotor body 10, but also shields the eddy current loss on the outermost layer. Combined with heat radiation heat dissipation, it can effectively improve heat dissipation efficiency, so that heat will not be generated on the rotor body 10, which can reduce the temperature of the motor rotor 1, thereby improving the operational safety of the flywheel throughout its entire life cycle.

[0026] Specifically, such as Figure 1 and Figure 2 As shown, the low permeability sheath 200 and the high structural strength sheath 201 are both constructed as annular structures. Both the low permeability sheath 200 and the high structural strength sheath 201 can be constructed as annular structures. This allows the annular structure to have perfect axisymmetry when the rotor body 10 rotates at high speed, ensuring extremely uniform stress distribution across the entire circumference and preventing stress concentration. Furthermore, it maintains a uniform spacing between the motor rotor 1 and the motor stator 30 across the entire circumference, reducing magnetic pull imbalance, torque pulsation, and electromagnetic noise. Additionally, it provides all-around protection for the rotor body 10, significantly reducing eddy current losses, heat generation, and energy loss.

[0027] Among them, such as Figure 1 and Figure 2 As shown, the low-permeability sheath 200 is a carbon fiber sheath, and the high-structural-strength sheath 201 is a metal sheath. The carbon fiber sheath possesses extremely high specific strength and specific modulus, and low permeability, making it an ideal non-magnetic material. It also exhibits excellent fatigue resistance. Using a carbon fiber sheath 200 better suits actual working conditions and can reduce eddy current losses in the rotor body 10. The metal sheath offers advantages such as low cost, good economic efficiency, high mechanical strength, isotropy, and excellent thermal conductivity. Constructing the high-structural-strength sheath 201 as a metal sheath further suits actual working conditions, providing better mechanical protection and structural support. It should be noted that other suitable materials can also be selected for the low-permeability sheath 200 and the high-structural-strength sheath 201.

[0028] In addition, the motor rotor 1 also includes a heat-conducting component coated on the outer surface of the metal sheath. The heat-conducting component assists in heat dissipation. By coating the outer surface of the metal sheath, it enhances the heat conduction of the rotor body 10, further improving its heat dissipation efficiency. This prevents heat from being generated on the rotor body 10, reduces the temperature of the motor rotor 1, optimizes its heat dissipation path, and thus improves the operational safety of the flywheel throughout its entire lifespan. The heat-conducting component can be made of a black heat-conducting material.

[0029] Of course, such as Figure 1 and Figure 2 As shown, the rotor body 10 includes a permanent magnet 100 and a rotor shaft 101. The permanent magnet 100 is sleeved on the outside of the rotor shaft 101, and a low-permeability sheath 200 is sleeved on the outside of the permanent magnet 100. The permanent magnet 100 and the rotor shaft 101 are components of the rotor body 10. The permanent magnet 100 can stably generate a strong magnetic field for a long time without an external power source. The rotor shaft 101 can support all the components of the motor rotor 1 and can also transmit the electromagnetic torque generated by the motor 2 to the load. The permanent magnet 100 is sleeved on the outside of the rotor shaft 101, meaning that the permanent magnet 100 can rotate with the rotor shaft 101. This maximizes the magnetic field strength, improves the efficiency and power density of the motor 2, and also enables magnetic field coupling. More direct and efficient, it can reduce magnetic leakage and optimize the energy conversion process. The low permeability sheath 200 is set on the outside of the permanent magnet 100. In this way, the low permeability sheath 200 can minimize the interference to the magnetic field and avoid magnetic field distortion. Secondly, it can provide the first layer of constraint for the permanent magnet 100 to prevent it from being directly exposed. In addition, it can significantly reduce the eddy current loss of the permanent magnet 100, reduce the heat generation of the permanent magnet 100, and can quickly dissipate the heat generated by the permanent magnet 100, thereby preventing the permanent magnet 100 from demagnetizing due to overheating.

[0030] Furthermore, such as Figure 1As shown, the inner diameter of the high-strength sheath 201 is d1, the outer diameter of the low-permeability sheath 200 is d2, and the diameter of the permanent magnet 100 is d3. The relationship between d1, d2, and d3 is: d1≤d2, d2≤d3. It should be noted that the inner diameter of the high-strength sheath 201 and the outer diameter of the low-permeability sheath 200 need to satisfy a certain relationship. Specifically, the inner diameter of the high-strength sheath 201 needs to be less than or equal to the outer diameter of the low-permeability sheath 200. This way, when the high-strength sheath 201 is fitted onto the outside of the low-permeability sheath 200, an interference fit can be formed. The high-strength sheath 201 can generate a large radial preload on the low-permeability sheath 200, ensuring that the sheath assembly 20 can work together to withstand the force and maintain a firm connection during high-speed rotation, jointly bearing the enormous centrifugal force, thereby jointly ensuring the mechanical safety and operating efficiency of the motor rotor 1. It should be noted that the inner diameter of the high structural strength sheath 201 should not be too small than the outer diameter of the low magnetic permeability sheath 200. Otherwise, when the high structural strength sheath 201 is fitted on the outside of the low magnetic permeability sheath 200, the high structural strength sheath 201 will be difficult to fit and will easily deform.

[0031] It should be noted that the outer diameter of the low-permeability sleeve 200 and the diameter of the permanent magnet 100 need to meet a certain relationship. Specifically, the outer diameter of the low-permeability sleeve 200 needs to be less than or equal to the diameter of the permanent magnet 100. This ensures an interference fit when the low-permeability sleeve 200 is fitted onto the outside of the rotor body 10, allowing it to apply a continuous radial clamping force to the permanent magnet 100. This effectively resists the enormous centrifugal force generated by the permanent magnet 100 during high-speed rotation, preventing it from scattering and thus ensuring the mechanical safety and operating efficiency of the motor rotor 1. However, it should also be noted that the outer diameter of the low-permeability sleeve 200 cannot be too small compared to the diameter of the permanent magnet 100. Otherwise, the low-permeability sleeve 200 will be difficult to fit onto the outside of the rotor body 10 and may easily deform.

[0032] It should be noted that the sheath assembly 20 can be constructed as a carbon fiber sheath, and the permanent magnet 100 can be divided into multiple blocks. This can effectively reduce the eddy current loss of the motor rotor 1. In addition, the sheath assembly 20 can also be segmented, which can effectively reduce the eddy current loss of the motor rotor 1.

[0033] like Figure 2As shown, the motor 2 according to this embodiment of the present invention includes: a motor stator 30 and a motor rotor 1 as described in the above embodiments. The motor rotor 1 can rotate around the motor stator 30. The motor stator 30 can generate a fixed or rotating magnetic field, which can be used to drive the motor rotor 1. The motor rotor 1 can rotate under the action of the magnetic field generated by the motor stator 30 and output mechanical energy. Current is passed through the stator coil in the motor stator 30, generating a magnetic field in the iron core. Under the action of this magnetic field, the motor rotor 1 is subjected to electromagnetic torque and begins to rotate. The motor rotor 1 outputs mechanical power through the shaft to drive the external load to work, thereby realizing the conversion of electrical energy into mechanical energy.

[0034] In addition, such as Figure 2 As shown, the motor rotor 1 is located inside the motor stator 30, and the motor rotor 1 and the motor stator 30 are spaced apart radially. That is, the motor stator 30 is located externally and is fixed, while the motor rotor 1 is located internally, mounted on the rotor shaft 101, and can rotate freely. The radial spacing between the motor rotor 1 and the motor stator 30 ensures that the motor rotor 1 can rotate freely, avoiding direct contact and friction between the motor rotor 1 and the motor stator 30, preventing jamming or wear, and thus ensuring the smooth operation of the motor 2.

[0035] It should be noted that, as Figure 2 As shown, a vacuum is set between the motor rotor 1 and the motor stator 30. In this way, the space between the motor rotor 1 and the motor stator 30 can form an air gap. The air gap is the key to the normal operation of the motor 2. When the windings of the motor stator 30 are energized, the air gap becomes a medium for electromagnetic induction, which converts electrical energy into mechanical energy. If the air gap disappears, the electromagnetic force cannot be effectively transmitted, causing the motor 2 to be unable to output power.

[0036] The flywheel energy storage device according to an embodiment of the present invention includes: a flywheel and a motor 2 as described in the above embodiments, wherein the flywheel and the motor rotor 1 are in transmission cooperation. The flywheel mainly stores and releases energy. The motor 2 can act as a motor to drive the flywheel to accelerate, or it can act as a generator 2 to extract energy from the decelerating flywheel. When charging, the motor 2 can act as a motor to drive the motor rotor 1 to rotate, and the motor rotor 1 in turn drives the flywheel to rotate. At this time, the flywheel stores kinetic energy. When discharging, the motor 2 acts as a generator, and the flywheel uses the stored kinetic energy to drive the motor rotor 1 to rotate. At this time, the motor 2 works as a generator to convert kinetic energy into electrical energy and release it.

[0037] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] In the description of this utility model, "first feature" and "second feature" may include one or more of the features. In the description of this utility model, "multiple" means two or more. In the description of this utility model, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. In the description of this utility model, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0039] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0040] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A motor rotor (1), characterized in that, include: Rotor body (10); The sheath assembly (20) includes a low permeability sheath (200) and a high structural strength sheath (201). The low permeability sheath (200) is sleeved on the outside of the rotor body (10), and the high structural strength sheath (201) is sleeved on the outside of the low permeability sheath (200).

2. The motor rotor (1) according to claim 1, characterized in that, The low permeability sheath (200) is constructed in a ring shape, and the high structural strength sheath (201) is constructed in a ring shape.

3. The motor rotor (1) according to claim 1, characterized in that, The low magnetic permeability sheath (200) is a carbon fiber sheath, and the high structural strength sheath (201) is a metal sheath.

4. The motor rotor (1) according to claim 3, characterized in that, Also includes: A heat-conducting component is coated on the outer surface of the metal sheath.

5. The motor rotor (1) according to claim 1, characterized in that, The rotor body (10) includes a permanent magnet (100) and a rotor shaft (101). The permanent magnet (100) is sleeved on the outside of the rotor shaft (101), and the low permeability sheath (200) is sleeved on the outside of the permanent magnet (100).

6. The motor rotor (1) according to claim 5, characterized in that, The inner diameter of the high structural strength sheath (201) is d1, the outer diameter of the low magnetic permeability sheath (200) is d2, and the diameter of the permanent magnet (100) is d3. The relationship between d1, d2 and d3 is: d1≤d2, d2≤d3.

7. An electric motor (2), characterized in that, include: Motor stator (30); The motor rotor (1) according to any one of claims 1-6, wherein the motor rotor (1) is rotatable about the motor stator (30).

8. The motor (2) according to claim 7, characterized in that, The motor rotor (1) is disposed inside the motor stator (30), and the motor rotor (1) and the motor stator (30) are spaced apart in the radial direction.

9. The motor (2) according to claim 8, characterized in that, The space between the motor rotor (1) and the motor stator (30) is set in a vacuum.

10. A flywheel energy storage device, characterized in that, include: flywheel; The motor (2) as described in claims 7-9, wherein the flywheel is in transmission cooperation with the motor rotor (1).

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