Outer rotor dynamic balance wind wheel motor

Abstract

The utility model discloses an outer rotor dynamic balance wind wheel motor, which comprises a motor main body, the motor main body comprises a stator assembly, a rotor assembly, a bearing assembly and a rotating shaft, the rotor assembly comprises a rotor shell fixedly connected with the rotating shaft, and a first end of the rotating shaft is provided with a wind wheel through a fastening assembly. The fastening assembly comprises a gasket and a nut which are sequentially arranged at the first end of the rotating shaft in a sleeving mode, the nut is in threaded connection with the rotating shaft, and the surface, making contact with the wind wheel, of the gasket is provided with composite anti-skid lines; a dynamic balance ring is coaxially installed on the periphery of the rotor shell and used for adjusting mass distribution. The weight of the dynamic balance ring is increased or reduced to adjust mass distribution, the wind wheel is prevented from loosening, the stability is improved, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to an external rotor dynamic balance wind turbine motor. Background Technology

[0002] An external rotor motor is a special type of electric motor in which the rotor and stator are in the opposite positions to those of a conventional motor: the rotor is located outside the motor and encloses the internal stator.

[0003] Because the rotor of an external rotor motor is located externally and directly drives the load, the following problems may occur after long-term operation:

[0004] Mechanical wear: Bearing wear, loosening of rotor permanent magnets or fixing components disrupt the initial balance. Load changes: Such as dust accumulation on fan blades or wear on wheel hubs and tires, leading to a shift in mass distribution. Material fatigue: Rotor structure deformation under high-speed rotation.

[0005] Uneven rotor mass distribution leads to vibration. Imbalance can cause severe vibration and noise, accelerate damage to bearings and windings, and even affect equipment accuracy or safety.

[0006] Traditional dynamic balancing methods:

[0007] 1. Trial weight method (empirical counterweight): By repeatedly adding counterweights (such as lead blocks or screws) and observing the changes in vibration, the balance is gradually adjusted. This method is time-consuming, relies on experience, has low accuracy, and may introduce new imbalances.

[0008] 2. Mechanical balancing machine: This type of machine uses a mechanical pendulum or rollers to support the rotor. The imbalance position is determined by the pointer deflection, and the counterweight is manually added or removed. It is only suitable for low speeds (<1000 rpm), and the manual reading error is large, making it unable to handle complex vibration modes.

[0009] Weight reduction method (drilling / milling): Drilling or milling the material at the unbalanced location on the rotor housing to reduce uneven mass distribution. This method can easily damage the rotor housing structure and weaken the material strength. Utility Model Content

[0010] In order to at least overcome one of the technical problems existing in the prior art, this utility model provides an external rotor dynamic balance wind turbine motor, which can adjust the mass distribution by adding or removing weight through the dynamic balance ring, prevent the wind turbine from loosening, improve stability, and extend service life.

[0011] An external rotor dynamically balanced wind turbine motor includes a motor body, which includes a stator assembly, a rotor assembly, a bearing assembly, and a shaft. The rotor assembly includes a rotor housing fixedly connected to the shaft. A wind turbine is mounted on a first end of the shaft via a fastening assembly, and a second end is rotatably connected to the bearing assembly. The shaft drives the rotor housing and the wind turbine to rotate synchronously. The fastening assembly includes a washer and a nut sequentially fitted onto the first end of the shaft. The nut is threadedly connected to the shaft. The surface of the washer in contact with the wind turbine is provided with composite anti-slip texture. A dynamic balancing ring is coaxially mounted on the periphery of the rotor housing for adjusting mass distribution.

[0012] In some embodiments, the dynamic balancing ring is provided with a regular array of balancing holes, the diameter of the balancing holes being 1 to 3 millimeters, the spacing between the holes being 2 to 3 times the diameter of the holes, and the holes being filled with counterweight particles.

[0013] In some embodiments, a graphene thermal pad is provided between the rotor housing and the dynamic balance ring. The graphene thermal pad has a thickness of 0.1 to 0.3 mm, a thermal conductivity of not less than 1500 W / m Kelvin, and a high-temperature resistant insulating layer coated on its surface.

[0014] In some embodiments, the dynamic balancing ring is made of carbon fiber reinforced aluminum matrix composite material with a density of 2.5 to 2.8 g / cm³, a tensile strength of not less than 600 MPa, and a thermal expansion coefficient that differs from that of the rotor housing by no more than 1 x 10⁻⁶ Kelvin.

[0015] In some embodiments, a mass sensor is provided inside the dynamic balancing ring, and the mass sensor is a piezoelectric ceramic sheet.

[0016] In some embodiments, the composite anti-slip texture consists of a micron-level interlaced grid pattern and a nano-level radial groove.

[0017] In some embodiments, the composite anti-slip texture has a micron-level interlaced grid pattern depth of 30 to 50 microns, a nanon-level radial groove width of 15 to 25 nanometers, and an angle of 10 to 20 degrees between the groove direction and the rotational tangent of the axis.

[0018] In some embodiments, the bearing assembly includes a hybrid ceramic bearing and a magnetohydrodynamic sealing ring, wherein the balls of the hybrid ceramic bearing are made of silicon nitride, and a fiber Bragg grating sensor is embedded in the bearing housing to monitor rotor eccentricity; the counterweight particles are made of tungsten alloy or polymer composite material.

[0019] Additional aspects and advantages of this invention will continue to be set forth in the description which follows, and in part will be obvious from the description or may be learned by practice of this invention. Attached Figure Description

[0020] 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:

[0021] Figure 1 This is a top-view three-dimensional structural diagram of this application;

[0022] Figure 2 This is a bottom-view three-dimensional structural diagram of this application;

[0023] Figure 3 This is a schematic diagram of the front view structure of this application;

[0024] Figure 4 This is a cross-sectional structural diagram after the wind turbine has been removed.

[0025] Figure 5 This is a cross-sectional structural diagram of the bearing assembly of this application;

[0026] Figure 6 This is a cross-sectional structural diagram of the fastening component of this application.

[0027] Figure label:

[0028] Stator assembly 1, rotor assembly 2;

[0029] Bearing assembly 3;

[0030] Hybrid ceramic bearing 30, magnetohydrodynamic sealing ring 31, ball bearing 32, bearing housing 33

[0031] Fiber Bragg grating sensor 34;

[0032] 4. Rotor shaft; 5. Rotor housing; 6. Fastening assembly; 60. Washer; 61. Nut;

[0033] Wind turbine 7, wind turbine central shaft 70;

[0034] Composite anti-slip texture 8;

[0035] 9. Dynamic balancing ring; 90. Balance hole array; 91. Counterweight particles;

[0036] Graphene thermal conductive pad 10, high temperature resistant insulation layer 11;

[0037] Mass sensor 12. Detailed Implementation

[0038] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0039] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying 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 element 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 this utility model.

[0040] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] Reference Figures 1-6An external rotor dynamically balanced wind turbine motor includes a motor body, which comprises a stator assembly 1, a rotor assembly 2, a bearing assembly 3, and a rotating shaft 4. The rotor assembly 2 includes a rotor housing 5 fixedly connected to the rotating shaft 4. A wind turbine 7 is mounted on the first end of the rotating shaft 4 via a fastening assembly 6, and the second end is rotatably connected to the bearing assembly 3. The rotating shaft 4 drives the rotor housing 5 and the wind turbine 7 to rotate synchronously. The fastening assembly 6 includes a washer 60 and a nut 61 sequentially sleeved on the first end of the rotating shaft 4. The nut 61 is threadedly connected to the rotating shaft 4. The end face of the washer 60 that contacts the wind turbine's central shaft 70 is provided with composite anti-slip texture 8. The wind turbine's central shaft 70 is a hollow shaft. A dynamic balancing ring 9 is coaxially mounted on the periphery of the rotor housing 5 for adjusting the mass distribution. This application changes the inertial force distribution of the rotor system by increasing or decreasing the mass of the dynamic balancing ring 9, such as by laser ablation, drilling, or cutting to reduce weight, or by adding counterweight particles to increase weight, so that the resultant centrifugal force and resultant torque approach zero. Because of the addition of the dynamic balancing ring 9, it is not necessary to directly drill holes or mill materials on the rotor housing 5 to reduce uneven mass distribution, thus avoiding easy damage to the structure of the rotor housing 5 and weakening of material strength. The composite anti-slip texture 8 can increase the static friction coefficient and suppress high-frequency micro-slippage. The threaded connection of the nut 61, together with the anti-slip texture of the washer 60, ensures stable axial preload and prevents the impeller 7 from loosening.

[0043] In some embodiments, the dynamic balancing ring 9 is provided with a regularly arranged array of balancing holes 90. The array of balancing holes 90 is a regular group structure of holes integrated on the dynamic balancing ring 9, and the mass distribution of the rotor system is adjusted by selectively filling with counterweight particles 91. The array of balancing holes 90 can be hexagonally closely arranged to maximize the hole density and improve the mass adjustment resolution; or it can be radially gradient distributed, with the outer hole diameter > the inner hole diameter to match the centrifugal force gradient; the hole diameter of the array of balancing holes 90 is 1 to 3 mm to adapt to different compensation levels; the hole spacing is 2 to 3 times the hole diameter to ensure structural strength; the holes are used to fill with counterweight particles 91, supporting independent filling of a single hole, with a minimum adjustment amount of 0.01 g.

[0044] In some embodiments, a graphene thermal pad 10 is provided between the rotor housing 5 and the dynamic balance ring 9. The graphene thermal pad 10 has a thickness of 0.1 to 0.3 mm, a thermal conductivity of not less than 1500 W / m Kelvin, and a high-temperature resistant insulating layer 11 coated on its surface, which may be polyimide-alumina or boron nitride nanosheet-silicone resin, etc. The graphene thermal pad 10 can quickly dissipate the heat from the rotor housing 5, reducing the temperature gradient between the dynamic balance ring 9 and the housing; and eliminates local hot spots (such as the temperature difference between the bearing area and the impeller area) through lateral heat diffusion.

[0045] In some embodiments, the dynamic balancing ring 9 is made of carbon fiber reinforced aluminum matrix composite material, which is a high-performance material made by combining carbon fiber with an aluminum alloy matrix; its density is 2.5 to 2.8 grams per cubic centimeter, its tensile strength is not less than 600 MPa, and the difference between its coefficient of thermal expansion and that of the rotor housing 5 does not exceed 1 x 10^-6 per Kelvin; it has the advantages of lightweight, high-strength support, optimized thermal stability, and extended fatigue life, and solves the problem of synergistic interaction between mass inertia, thermal deformation and structural reliability in high-speed motors.

[0046] In some embodiments, a mass sensor 12 is provided inside the dynamic balancing ring 9. The mass sensor 12 is a piezoelectric ceramic sheet that detects the local mass distribution in real time and feeds it back to the control system. The piezoelectric ceramic sheet detects the local mass distribution of the dynamic balancing ring 9 through strain signals with an accuracy of ±0.01g and a response time of <1ms. During high-speed rotation, the centrifugal force change is directly measured (resolution 0.1N at 30,000rpm), providing early warning of the risk of imbalance. The rotor vibration energy is used to generate electricity, eliminating the need for external power supply.

[0047] In some embodiments, the composite anti-slip texture 8 is composed of micron-level interlaced grid patterns and nano-level radial grooves; the depth of the micron-level interlaced grid patterns of the composite anti-slip texture 8 is 30 to 50 microns, which increases the static friction coefficient through mechanical interlocking and prevents the impeller from axially loosening; the width of the nano-level radial grooves is 15 to 25 nanometers, which uses surface capillary effect to adsorb lubricating film and suppress high-frequency micro-vibrations; and the angle between the groove direction and the rotational tangent of the shaft 4 is 10 to 20 degrees, thus disrupting the vibration wave transmission path.

[0048] In some embodiments, the bearing assembly 3 includes a hybrid ceramic bearing 30 and a magnetohydrodynamic sealing ring 31. A magnetohydrodynamic liquid film with a pressure resistance of 0.5 MPa blocks dust / oil intrusion and has a long service life. The balls 32 of the hybrid ceramic bearing 30 are made of silicon nitride, and the density of the silicon nitride balls 32 is only 40% of that of steel, reducing centrifugal load. A fiber Bragg grating sensor 34 is embedded in the bearing housing 33 to monitor rotor eccentricity. The counterweight particles 91 are made of tungsten alloy or polymer composite material. The balls 32 of the hybrid ceramic bearing 30 are made of silicon nitride, and the inner and outer rings are made of high-carbon chromium steel (such as GCr15) or ceramic (ZrO2 or Si3N4 all-ceramic bearing). The cage is made of polyetheretherketone or non-magnetic metal. The fiber Bragg grating sensor (FBG)... 34) The rotor eccentricity is indirectly assessed by monitoring the strain of the bearing housing 33. The annular groove embedded in the inner wall of the bearing housing 33 directly senses the deformation caused by the radial load. A symmetrical distribution of 90° or 120° can be used, for example, an array of 3 FBG sensors to eliminate single-point measurement errors and accurately locate the eccentricity direction.

[0049] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An external rotor dynamically balanced wind turbine motor, comprising a motor body, the motor body including a stator assembly, a rotor assembly, a bearing assembly, and a rotating shaft, the rotor assembly including a rotor housing fixedly connected to the rotating shaft, a wind turbine mounted on a first end of the rotating shaft via a fastening assembly, and a second end rotatably connected to the bearing assembly, the rotating shaft driving the rotor housing and the wind turbine to rotate synchronously, characterized in that: The fastening assembly includes a washer and a nut sequentially fitted onto the first end of the rotating shaft. The nut is threaded to the rotating shaft, and the surface of the washer that contacts the impeller is provided with composite anti-slip texture. A dynamic balancing ring is coaxially installed on the outer periphery of the rotor housing to adjust the mass distribution.

2. The external rotor dynamically balanced wind turbine motor as described in claim 1, characterized in that: The dynamic balancing ring has a regular array of balancing holes. The diameter of the balancing holes is 1 to 3 millimeters, and the spacing between the holes is 2 to 3 times the diameter of the holes. The holes are filled with counterweight particles.

3. The external rotor dynamically balanced wind turbine motor as described in claim 2, characterized in that: A graphene thermal pad is provided between the rotor housing and the dynamic balance ring. The graphene thermal pad has a thickness of 0.1 to 0.3 mm, a thermal conductivity of not less than 1500 W / m Kelvin, and a high-temperature resistant insulating layer on its surface.

4. The external rotor dynamically balanced wind turbine motor as described in claim 3, characterized in that: The dynamic balancing ring is made of carbon fiber reinforced aluminum matrix composite material with a density of 2.5 to 2.8 grams per cubic centimeter, a tensile strength of not less than 600 MPa, and a thermal expansion coefficient that differs from that of the rotor housing by no more than 1 x 10^-6 per Kelvin.

5. The external rotor dynamically balanced wind turbine motor as described in claim 4, characterized in that: A mass sensor, which is a piezoelectric ceramic sheet, is provided on the inner side of the dynamic balancing ring.

6. The external rotor dynamically balanced wind turbine motor as described in any one of claims 1-4, characterized in that: The composite anti-slip texture consists of micron-level interlaced grid patterns and nano-level radial grooves.

7. The external rotor dynamically balanced wind turbine motor as described in claim 6, characterized in that: The composite anti-slip texture has a micron-level interlaced grid pattern depth of 30 to 50 microns, a nanon-level radial groove width of 15 to 25 nanometers, and an angle of 10 to 20 degrees between the groove direction and the rotational tangent of the axis.

8. The external rotor dynamically balanced wind turbine motor as described in claim 5, characterized in that: The bearing assembly includes a hybrid ceramic bearing and a magnetohydrodynamic sealing ring. The balls of the hybrid ceramic bearing are made of silicon nitride. A fiber Bragg grating sensor is embedded in the bearing housing to monitor the rotor eccentricity. The counterweight particles are made of tungsten alloy or polymer composite material.

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