CN110474558B - Multifunctional electret generator based on permanent magnet suspension gyroscope - Google Patents
Multifunctional electret generator based on permanent magnet suspension gyroscope Download PDFInfo
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- CN110474558B CN110474558B CN201910768464.XA CN201910768464A CN110474558B CN 110474558 B CN110474558 B CN 110474558B CN 201910768464 A CN201910768464 A CN 201910768464A CN 110474558 B CN110474558 B CN 110474558B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
- H02N1/04—Friction generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
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- H02N1/08—Influence generators with conductive charge carrier, i.e. capacitor machines
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Abstract
A multifunctional electret generator based on a permanent magnet suspension gyroscope comprises a vibration pickup rotor assembly and an external fixing assembly. The structure formed by the triangular permanent magnet, the insulating substrate, the positioning baffle and the fixed magnet cover according to the assembly sequence is called an external fixed assembly. The structure formed by the blade rotor, the vibration pick-up rotor and the two annular permanent magnets according to the assembly sequence is called a vibration pick-up rotor component. By adjusting the positions of the triangular permanent magnet and the annular magnet, the vibration picking rotor assembly can be suspended on the external fixing assembly under the point contact limitation of the positioning baffle. The method utilizes the electricity generation principle of electrostatic induction of the electret film, charges are injected into the electret film to generate bias voltage on a substrate electrode covered by a vibration pickup rotor, and then alternating current is output to an external circuit. The mechanical vibration energy, the wind energy and the hydraulic energy are converted into the electric energy. The invention has the characteristics of good output characteristic, simple structure, small damping, wide frequency band, excellent durability and flexibility and the like.
Description
Technical Field
The invention belongs to the field of energy conversion of micro energy systems, and particularly relates to a multifunctional electret generator based on a permanent magnet suspension gyroscope.
Background
With the wide application of wireless sensor networks in the fields of portable electronic products and the like, the devices of the wireless sensor networks are required to have relatively long service life and wide distribution, and it is impractical to replace batteries or supply power by using power lines, which presents a new challenge to the power supply of the devices. At present, the energy consumption of micro wireless products and micro electro mechanical systems devices is reduced to milliwatt level, which makes it possible to convert mechanical vibration energy, hydraulic energy and wind energy existing in the environment into electric energy to drive the micro devices to work.
However, there are several issues to be solved before the energy harvesting technology is put to practical use. First, most electret-based electrostatic energy harvesters are currently in an in-plane oscillating structure, and the freedom of vibration is limited, with many in one direction and few reports on two directions. Although the structure principle is simple, a spring is required as a reset element, the manufacturing and assembly of the reset element are generally complex, and the support spring can generate large mechanical and material damping during vibration, which affects the energy conversion efficiency of the device, for example, Kai Tao et al report an in-plane two-degree-of-freedom interdigital energy collector in "sandwind-structured two-dimensional MEMS electric power generator for low-level electromagnetic energy harvesting" (Sensors and Actuators, International publication of "MEMS-based two-degree-of-freedom Sandwich structure low-frequency vibration energy collector": Sensors and Actuators). It achieves an output of 0.12 μ w at an eigenfrequency of 125Hz at an excitation of 0.2g, but since this structure can only collect mechanical vibration energy in two directions, a flexible and durable energy conversion device needs to be further explored. On the other hand, in order to increase the flexibility of the device, there is also research aimed at reducing the frictional resistance during the collection of environmental Energy, such as Xiandai Zhong et al reported a rotary one-dimensional Friction type Nano-Generator in "Rotating three-dimensional electric Generator Using Sliding Contact and non-Contact from 1D Fiber Friction" (Nano Energy 33(2017) 184-. However, the generator can generate energy only by means of friction of fibers driven by a rotating shaft, the contact area is small under the condition of the same volume, the surface nano structure is easy to damage after long-time repeated friction, and the lowest vibration starting wind speed is large.
Disclosure of Invention
The technical problem to be solved is as follows:
in order to avoid the defects of the prior art, the invention provides a multifunctional electret generator based on a permanent magnetic suspension gyroscope, which utilizes a variable capacitor structure for providing bias voltage by an electret film. The vibration picking rotor component is in a suspension state under the action of magnetic force in the external fixed component, and when the vibration picking rotor component is excited by the outside, the vibration picking rotor component can swing relatively in any direction and can rotate freely. The power generation principle is based on the film friction/electrostatic induction principle of electrets, a layer of substrate electrode and an electret film are covered on the outer cylindrical surface of the suspended vibration pickup rotor, and the electret film adopts a charged implantation method to implant surface charges to promote the substrate electrode to form surface bias voltage. When the suspension vibration pickup rotor component and the external fixed component generate relative motion due to external excitation, the external kinetic energy can be converted into electric energy through the connection of an external circuit due to electret friction/electrostatic induction. The external kinetic energy can be mechanical vibration kinetic energy or rotation kinetic energy of the vibration pickup rotor caused by wind power or water flow.
The technical scheme of the invention is as follows: the utility model provides a multi-functional electret generator based on top suspends forever which characterized in that: the vibration picking rotor assembly is positioned right above the external fixing assembly, and central axes of the vibration picking rotor assembly and the external fixing assembly are parallel;
the external fixing component comprises an insulating substrate, a triangular permanent magnet, a fixed magnet cover and a positioning baffle sheet; the insulating substrate is used for fixedly supporting the whole generator, and four grooves which are distributed in a rectangular shape are formed in the upper surface of the insulating substrate and are used for respectively fixing the four triangular permanent magnets; the four triangular permanent magnets are symmetrically arranged relative to the central axis of the external fixing component, and the bevel edges of the four triangular permanent magnets face the symmetry axis of the four triangular permanent magnets; the fixed magnet cover is a shell structure with a concave arc-shaped upper surface, is fixed on the upper surface of the insulating substrate, and is used for placing the triangular permanent magnet in the shell structure, and the central axis of the concave arc surface of the fixed magnet cover is parallel to the symmetry axis of the triangular permanent magnet; the positioning baffle is vertically fixed at one end of the insulating substrate, is perpendicular to the symmetry axis of the triangular permanent magnet and is used for limiting the axial displacement of the vibration pick-up rotor assembly;
the vibration pick-up rotor assembly comprises a blade rotor, a vibration pick-up rotor and an annular permanent magnet; the vibration picking rotor is of a hollow cylindrical structure and is coaxial with the vibration picking rotor component; the two annular permanent magnets are coaxially arranged in the vibration pickup rotor, each annular permanent magnet is positioned right above the triangular permanent magnet with the two opposite bevel edges, the magnetization polarities of the opposite surfaces of the annular permanent magnets and the triangular permanent magnets are the same, a mutual exclusion effect is formed, and the vibration pickup rotor assembly can be suspended above the external fixing assembly; the blade rotor is installed at one overhanging end of the vibration pickup rotor, and the other end of the vibration pickup rotor is in point contact with the positioning retaining sheet;
a layer of substrate electrode is arranged on the concave arc surface of the fixed magnet cover and the outer surface of the vibration pick-up rotor, and an electret polymer film is covered on the substrate electrode of the vibration pick-up rotor; the concave arc surface of the fixed magnet cover and the substrate electrodes on the outer surface of the vibration pickup rotor are respectively connected with two electrodes of an external circuit through leads, so that the flow of charges caused by the charge redistribution of the two substrate electrodes under external excitation is realized, and further, electric energy is output to the external circuit.
The further technical scheme of the invention is as follows: the insulating substrate, the fixed magnet cover, the vibration pick-up rotor and the blade rotor are all made of engineering plastics and have the thickness of 1-3 mm.
The further technical scheme of the invention is as follows: the positioning baffle plate is made of aluminum plates through milling, and the thickness of the positioning baffle plate is 2 mm.
The further technical scheme of the invention is as follows: a positioning small hole is formed in the positioning baffle, the aperture is 3mm, the height is 30mm, and the positioning small hole is coaxial with the vibration pickup rotor; the other end of the vibration pickup rotor is inserted into the positioning small hole, and clearance fit is kept, so that the axial displacement of the vibration pickup rotor is limited.
The further technical scheme of the invention is as follows: the concave arc surface of the fixed magnet cover and the substrate electrode on the outer surface of the vibration pick-up rotor are prepared by a flexible circuit board process, the base material is polyimide, and the pattern of the substrate electrode is customized into a shape of a strip grid electrode with equal intervals.
The further technical scheme of the invention is as follows: the electret polymer film is Parylene or Teflon, and the surface of the electret polymer film is covered on the flexible substrate electrode by adopting a chemical vapor deposition, spin coating, deep coating and pouring method.
The further technical scheme of the invention is as follows: according to the charge implantation method of the electret polymer film, the electret dipole pre-injection is completed by adopting corona charging and electron beam radiation.
The further technical scheme of the invention is as follows: axial distance L of two annular permanent magnets2Is less than the axial distance L of the triangular permanent magnet opposite to the triangular permanent magnet1，L1Greater than L2The value of (A) is between 0.5 and 1 mm.
The further technical scheme of the invention is as follows: the multifunctional electret generator comprises two external fixing assemblies, wherein concave arcs of the external fixing assemblies are oppositely arranged, a hollow columnar structure is formed by combination, and the vibration pickup rotor assembly is coaxially arranged at a hollow position between the two external fixing assemblies.
The further technical scheme of the invention is as follows: the blade rotor consists of 6 bowl-shaped blades, the diameter of a part bearing wind power or water power is 16mm, and the total length of each blade is 28 mm.
Advantageous effects
The invention has the beneficial effects that: the invention utilizes the electricity generation principle of electrostatic induction, and charges are injected into an electret film to generate bias voltage on a substrate electrode covered by a vibration pickup rotor. When external excitation causes the suspended vibration pick-up rotor to swing out of the plane relative to the substrate electrode attached to the concave surface of the fixed magnet cover, or wind energy blows or water power in the environment pushes the blade rotor to rotate, the vibration pick-up rotor assembly is driven to rotate, the inherent capacitance of the multifunctional electret generator of the permanent magnet suspension gyro is caused to change, and then charges between the two substrate electrodes are redistributed through an external circuit, and alternating current is output to the external circuit. The multifunctional electret generator of the permanent magnetic suspension gyro can convert partial mechanical energy, wind energy and hydraulic energy into electric energy. Compared with the traditional electret generator, the multifunctional electret generator based on the permanent magnetic suspension gyroscope provided by the invention adopts the suspension magnetic suspension gyroscope type structure to realize out-of-plane rotation and swing, the traditional spring type reset structure is abandoned, low-damping and multi-direction acquisition and conversion work in the working process is achieved, and meanwhile, the inherent capacitance change rate of the generator is increased by the out-of-plane rotation type structure. And the vibration energy, the wind energy and the hydraulic energy can be collected simultaneously, the stress concentration problem of the simply supported beam is overcome, and the collectable vibration frequency bandwidth is enlarged, so that the high-performance output is easy to obtain.
The invention has the characteristics of simple structure, out-of-plane rotation, permanent magnetic suspension type supporting structure, capability of collecting mechanical vibration energy, wind energy and hydraulic energy, durability, excellent flexibility and the like, and has wide commercial value. The method has the following specific points:
firstly, the multifunctional generator has smart structure: a permanent magnetic suspension supporting structure is adopted, a positioning baffle is additionally arranged, and the low-damping multidirectional working is realized; the device can operate in two working modes of rotation and swing at the same time, does not need other external auxiliary supports, and is compact in structure. Through tests, the minimum oscillation starting wind speed of the multifunctional electret generator of the magnetic suspension gyroscope is 1.8m/s and is lower than that of a plurality of electret wind speed energy generators.
Secondly, tests on the multifunctional electret generator of the magnetic suspension gyroscope between different wind speed excitations and the output voltage of the generator show that the output voltage and the wind speed have good linear relation and can be used as a wind speed sensor.
Drawings
Fig. 1-1 is an overall schematic diagram of a multifunctional electret generator based on a permanent magnetic suspension gyro according to the invention.
Fig. 1-2 are schematic diagrams of magnet arrangements inside a permanent magnet suspension gyro generator.
Fig. 1-3 are schematic diagrams of distribution of static induction charges of a permanent magnet suspension gyro type generator.
Fig. 1-4 show different wind speed excitation test results of the permanent magnet suspension gyro type generator.
Fig. 1-5 show the test results between different wind speed excitations and the output voltage of the permanent magnet suspension gyro generator.
Figure 2 is a two partial sectional view of the embodiment.
FIG. 3 is a sectional view of a structure of a third embodiment.
Description of reference numerals: 1. a vane rotor; 2. a triangular permanent magnet; 3. an insulating substrate; 4. an annular permanent magnet; 5. a vibration pick-up rotor; 6. positioning a baffle plate; 7. a fixed magnet cover; 8. a substrate electrode; 9. an electret polymer film.
Detailed Description
The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Example 1
As shown in fig. 1-1, the present embodiment is essentially a variable capacitor using an electret to provide bias voltage, and the multifunctional electret generator of the permanent magnet levitation gyro mainly comprises a blade rotor 1, a triangular permanent magnet 2, an insulating base plate 3, a ring permanent magnet 4, a vibration pickup rotor 5, a positioning baffle 6, a fixed magnet cover 7, a substrate electrode 8 and an electret polymer film 9, wherein: the insulating substrate 3, the fixed magnet cover 7 and the vibration pick-up rotor 5 are sequentially arranged from bottom to top, and the positioning blocking piece 6 is inserted into a groove at the corresponding position of the insulating substrate. The structure composed of the triangular permanent magnet 2, the insulating substrate 3, the positioning baffle 6 and the fixed magnet cover 7 in the assembly order is called an external fixing component. The structure formed by the blade rotor 1, the vibration pick-up rotor 5 and the two annular permanent magnets 4 according to the assembly sequence is called a vibration pick-up rotor component, wherein the two annular permanent magnets 4 are embedded in the vibration pick-up rotor 5, and the blade rotor 1 is fixed at one overhanging end of the vibration pick-up rotor 5. As shown in fig. 1-2, 4 triangular permanent magnets are fixedly placed in the grooves formed in the insulating substrate 3, and the magnetization polarities of the hypotenuses of the 4 triangular permanent magnets are the same. In addition, the surface of the annular permanent magnet with the same radial magnetization polarity as the bevel edge of the triangular permanent magnet is arranged, namely the triangular permanent magnets 2.1 and 2.4 repel each other with the annular permanent magnet 4.1, and the triangular permanent magnets 2.2 and 2.3 repel each other with the annular permanent magnet 4.2. The distance between the annular permanent magnets 4.1 and 4.2 is L2, the distance between the triangular permanent magnets 2.1 and 2.2, and the distance between the triangular permanent magnets 2.3 and 2.4 is L1, wherein L1 is slightly larger than L2, and the distance can be between 0.5mm and 1mm, so that the suspension state of the vibration picking rotor assembly is ensured. In addition, for the stationary substrate electrode, the substrate electrode 8 is covered on the concave arc surface of the stationary magnet cover 7, and for the rotatable substrate electrode, the substrate electrode 8 is covered on the cylindrical outer surface of the vibration pickup rotor 5, and is also covered with a layer of electret thin-film polymer 9 which is implanted with electric charges in advance.
Fig. 1-3 are simplified views from a to a in fig. 1-1, showing the induced charge distribution of the electret thin-film polymer 9 pre-implanted with charge on the substrate electrode 8 in an unexcited state after the multifunctional electret generator of the permanent magnet levitation gyro is assembled. Fig. 1-4 show the test results of the permanent magnet suspended gyroscope type generator under different wind speed excitations, and the test results show that the minimum oscillation starting wind speed of the permanent magnet suspended gyroscope type generator is reduced to 1.8 m/s. Fig. 1 to 5 show the test results between different wind speed excitations and the output voltage of the permanent magnet suspended gyro generator, which indicate that the permanent magnet suspended gyro generator can be used as a wind speed sensor.
The positioning baffle 6 is provided with a positioning hole, the aperture is 3mm, the height of the opening is 30mm, the positioning baffle is made of aluminum plates, the thickness is 2mm, the vibration picking rotor assembly is limited at a saddle point, and the vibration picking rotor assembly can be used as a signal extraction electrode of a substrate electrode 8 covered on the vibration picking rotor 5.
The vibration pick-up rotor 5 is formed by bonding two half cylinders, one end of the vibration pick-up rotor 5 is placed in a positioning hole formed in a positioning separation blade 6, the other end of the vibration pick-up rotor 5 is fixedly connected with the blade rotor 1, a layer of substrate electrode 8 is bonded on the outer cylindrical surface of the vibration pick-up rotor 5, and meanwhile, a layer of electret film polymer 9 with charges implanted in advance is covered on the substrate electrode 8.
The triangular permanent magnet 2 is made of aluminum iron boron, the cross section of the shape of the triangular permanent magnet is an isosceles right triangle, and the right-angle side of the triangular permanent magnet is 5 mm.
The inner diameter of the annular magnet 4 is 5mm, and the outer diameter is 5.5 mm.
The fixed magnet cover 7 is made of engineering plastics, and a layer of substrate electrode 8 is bonded on the concave surface of the fixed magnet cover.
The substrate electrode 8 is prepared by adopting a flexible circuit board process, and is shaped into a strip grid shape with equal intervals.
The electret film material 9 is made of one of Parylene, Teflon, silicon dioxide and other electret materials, and charges or dipoles are implanted into the surface of the electret polymer in a corona charging mode, so that a bias voltage is generated on the surface of the substrate electrode 8.
The distance between the grooves of the triangular permanent magnets 2 arranged on the insulating substrate 3 is 50mm in the direction parallel to the axis of the positioning small hole of the positioning baffle 6; in the axial direction of the positioning small hole of the vertical positioning baffle 6, the distance between the grooves for arranging the triangular permanent magnet 2 on the insulating substrate 3 is 15 mm.
Annular permanent magnet 4 and triangle-shaped permanent magnet 2 of placing in the rotor 5 of picking up shakes and to guarantee that the terminal surface has the deviation about 0.5mm, magnet atress is more even like this, has overcome the big damping scheduling problem that the rotatory polar plate area is little and need the spring to reset in traditional face simultaneously, has increased the form of energy collection, has improved the electric energy output characteristic.
Example 2
Multifunctional electret energy collector formed by upper external fixing component and lower external fixing component
As shown in fig. 2, the multifunctional electret energy harvester is composed of an upper external fixing component and a lower external fixing component, the rest of the structure principle is the same as that of the embodiment 1, the upper insulating substrate 3 is provided with triangular permanent magnets 2 with the same size, and the polarity selection is the same as that of the embodiment 1. Two external fixation subassemblies can make the rotor subassembly operation in-process of shaking pick up more steady like this, simultaneously because two fixed substrate electrodes 8 output electric energy simultaneously, further increase the electric energy of output, make full use of the electret film material of the outer cylindrical surface parcel of rotor 5 of shaking pick up, make it rotate at same week and forward the electric quantity for embodiment 1's twice.
Example 3
As shown in fig. 3, in this embodiment, the blade rotor 1 bearing wind power is changed into a blade which can not only receive wind but also collect hydraulic energy, so as to further widen the energy collection form and expand the application fields of the generator.
The hydraulic power collecting blade 1 consists of 6 bowl-shaped blades, the diameter of the part bearing wind power is 16mm, and the length of the part bearing wind power is 28 mm.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (8)
1. The utility model provides a multi-functional electret generator based on top suspends forever which characterized in that: the vibration picking rotor assembly is positioned right above the external fixing assembly, and central axes of the vibration picking rotor assembly and the external fixing assembly are parallel;
the external fixing component comprises an insulating substrate, a triangular permanent magnet, a fixed magnet cover and a positioning baffle sheet; the insulating substrate is used for fixedly supporting the whole generator, and four grooves which are distributed in a rectangular shape are formed in the upper surface of the insulating substrate and are used for respectively fixing the four triangular permanent magnets; the four triangular permanent magnets are symmetrically arranged relative to the central axis of the external fixing component, and the bevel edges of the four triangular permanent magnets face the symmetry axis of the four triangular permanent magnets; the fixed magnet cover is a shell structure with a concave arc-shaped upper surface, is fixed on the upper surface of the insulating substrate, and is used for placing the triangular permanent magnet in the shell structure, and the central axis of the concave arc surface of the fixed magnet cover is parallel to the symmetry axis of the triangular permanent magnet; the positioning baffle is vertically fixed at one end of the insulating substrate, is perpendicular to the symmetry axis of the triangular permanent magnet and is used for limiting the axial displacement of the vibration pick-up rotor assembly;
the vibration pick-up rotor assembly comprises a blade rotor, a vibration pick-up rotor and an annular permanent magnet; the vibration picking rotor is of a hollow cylindrical structure and is coaxial with the vibration picking rotor component; the two annular permanent magnets are coaxially arranged in the vibration pickup rotor, each annular permanent magnet is positioned right above the triangular permanent magnet with the two opposite bevel edges, the magnetization polarities of the opposite surfaces of the annular permanent magnets and the triangular permanent magnets are the same, a mutual exclusion effect is formed, and the vibration pickup rotor assembly can be suspended above the external fixing assembly; the blade rotor is installed at one overhanging end of the vibration pickup rotor, and the other end of the vibration pickup rotor is in point contact with the positioning retaining sheet;
a layer of substrate electrode is arranged on the concave arc surface of the fixed magnet cover and the outer surface of the vibration pick-up rotor, and an electret polymer film is covered on the substrate electrode of the vibration pick-up rotor; the concave arc surface of the fixed magnet cover and the substrate electrodes on the outer surface of the vibration pickup rotor are respectively connected with two electrodes of an external circuit through leads, so that the charge flow caused by charge redistribution of the two substrate electrodes under external excitation is realized, and further, electric energy is output to the external circuit;
the charged implantation method of the electret polymer film adopts a corona charging or electron beam radiation mode to complete electret dipole pre-injection;
axial distance L of two annular permanent magnets2Is less than the axial distance L of the triangular permanent magnet opposite to the triangular permanent magnet1，L1Greater than L2The value of (A) is between 0.5 and 1 mm.
2. The multifunctional electret generator based on a permanent magnet suspension gyro as claimed in claim 1, wherein: the insulating substrate, the fixed magnet cover, the vibration pick-up rotor and the blade rotor are all made of engineering plastics and have the thickness of 1-3 mm.
3. The multifunctional electret generator based on a permanent magnet suspension gyro as claimed in claim 1, wherein: the positioning baffle plate is made of aluminum plates through milling, and the thickness of the positioning baffle plate is 2 mm.
4. The multifunctional electret generator based on a permanent magnet suspension gyro as claimed in claim 1, wherein: a positioning small hole is formed in the positioning baffle, the aperture is 3mm, the height is 30mm, and the positioning small hole is coaxial with the vibration pickup rotor; the other end of the vibration pickup rotor is inserted into the positioning small hole, and clearance fit is kept, so that the axial displacement of the vibration pickup rotor is limited.
5. The multifunctional electret generator based on a permanent magnet suspension gyro as claimed in claim 1, wherein: the concave arc surface of the fixed magnet cover and the substrate electrode on the outer surface of the vibration pick-up rotor are prepared by a flexible circuit board process, the base material is polyimide, and the pattern of the substrate electrode is customized into a shape of a strip grid electrode with equal intervals.
6. The multifunctional electret generator based on a permanent magnet suspension gyro as claimed in claim 1, wherein: the electret polymer film is Parylene or Teflon, and the surface of the electret polymer film is covered on the flexible substrate electrode by adopting a chemical vapor deposition, spin coating, deep coating and pouring method.
7. The multifunctional electret generator based on a permanent magnet suspension gyro as claimed in claim 1, wherein: the multifunctional electret generator comprises two external fixing assemblies, wherein concave arcs of the external fixing assemblies are oppositely arranged, a hollow columnar structure is formed by combination, and the vibration pickup rotor assembly is coaxially arranged at a hollow position between the two external fixing assemblies.
8. The multifunctional electret generator based on a permanent magnet suspension gyro as claimed in claim 1, wherein: the blade rotor consists of 6 bowl-shaped blades, the diameter of a part bearing wind power or water power is 16mm, and the total length of each blade is 28 mm.
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| CN105162353B (en) * | 2015-07-17 | 2016-08-17 | 北京理工大学 | A kind of based on electret electrostatic charming appearance and behaviour MEMS electromotor and electricity-generating method thereof |
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