A micro generator and a flexible printed circuit board for the micro generator

Abstract

The present invention relates to the technical field of generators, and in particular to a micro-generator, comprising: a stator, wherein the stator is a hollow permanent magnet, or the stator is a hollow component formed by splicing a plurality of permanent magnets with internal curved surfaces; a rotor, wherein the rotor comprises an iron core inserted into the hollow interior of the stator, and the outer surface of the iron core is covered and fixed by at least two flexible printed circuit boards; the flexible printed circuit board forms a serpentine wire after opening a window, and when the rotor rotates, the serpentine wire cuts the magnetic flux lines formed by the permanent magnet, and forms an induced current in the serpentine wire. The present invention adopts a flexible printed circuit board to replace the winding rotor, so that the size of the generator rotor is greatly reduced, and the dilemma that the micro-generator rotor is difficult to put into the stator is solved. In addition, the serpentine wire of the flexible printed circuit board of the present invention can increase the reflection area of ​​the cutting magnetic flux lines, and improve the efficiency of the micro-generator in obtaining electric energy.

Description

Technical Field

[0001] The present invention relates to the technical field of generators, and in particular to a micro generator and a flexible printed circuit board used for the micro generator. Background Art

[0002] The storage capacity of batteries is limited. If batteries are used alone to power some small scenes, the battery power will be exhausted in a few hours or more than ten hours. Using micro generators to power can maintain power longer than batteries. Micro generators are a new type of energy-saving and environmentally friendly product. In some small scenes, they generate electricity through external power. They are energy-saving, environmentally friendly, pollution-free, etc., and are widely used. They can also provide power for a longer time than batteries.

[0003] At present, micro generators are generally still manufactured using traditional stator windings or rotor windings. However, traditional winding generators will limit the size of the micro generator. For some micro scenarios, the size of the micro generator needs to be very small. If the size of the winding is further compressed, it will greatly increase the difficulty of the winding manufacturing process; if a piezoelectric ceramic generator is used, its power generation efficiency will be reduced, and it will be difficult to meet the power consumption in specific scenarios.

[0004] Therefore, in order to solve the problems existing in the prior art, a micro generator is needed that can reduce the size of the generator and ensure the power generation efficiency. Summary of the invention

[0005] The present invention provides a micro generator to solve the technical problem that the generator is too large or the power generation efficiency is not high in a specific power usage scenario in the prior art.

[0006] According to one aspect of the present invention, a micro-generator is provided to solve the technical problem that the generator is too large or has low power generation efficiency in specific scenarios in the prior art. The present invention takes into account that in a micro-structure, the structure volume is small and the space is narrow. It is difficult to miniaturize the generator by manufacturing the generator in a winding manner.

[0007] According to one aspect of the present invention, there is provided a micro-generator comprising: a stator, wherein the stator is a hollow permanent magnet, or the stator is a hollow component formed by splicing a plurality of permanent magnets with internally curved surfaces;

[0008] A rotor, the rotor comprising a hollow iron core inserted into the stator, the outer surface of the iron core being covered and fixed by at least two flexible printed circuit boards;

[0009] The flexible printed circuit board forms a serpentine conductor after the window is opened. When the rotor rotates, the serpentine conductor cuts the magnetic flux lines formed by the permanent magnet, and an induced current is formed in the serpentine conductor.

[0010] The present invention uses a flexible printed circuit board instead of traditional windings as the rotor, solving the problem that the windings cannot be placed in the stator in the micro-generator. The serpentine wire on the flexible printed circuit board is equivalent to replacing the copper wire winding to cut the magnetic flux lines, thereby obtaining current.

[0011] Preferably, the micro-generator of the present invention further comprises a housing, and the stator is embedded in the housing. A plurality of keys are arranged on the inner surface of the housing, and a plurality of key slots corresponding to the keys are provided on the outer surface of the stator, and the stator is fixed in the housing by surface mounting.

[0012] The inner surface of the micro-generator shell of the present invention is provided with a key, and the outer surface of the stator is provided with a plurality of key slots corresponding to the key, so that the stator can be disassembled from the shell by axial pushing / sliding, which can greatly improve the assembly process of the micro-generator.

[0013] Preferably, the micro-generator of the present invention further comprises a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively fitted and fixed to two ends of the shell.

[0014] The first end of the iron core fixes the rotating shaft, and the rotating shaft extends out of the first end cover; the second end of the iron core fixes the rectifier, and the end of the serpentine wire extends to the edge of the flexible printed circuit board and is fixedly connected to the drainage wire, and the drainage wire is connected to the rectifier; the rectifier extends out of the second end cover.

[0015] Preferably, the uniform silver paste on the serpentine wire of the present invention increases the thickness of the serpentine wire. The present invention enhances the cutting effect by coating the serpentine wire on the flexible printed circuit board with uniform silver paste. Using the flexible printed circuit board as a reactant of electromagnetic induction, the serpentine wire is uniformly coated with silver paste to increase the reaction area, which can greatly increase the power generation efficiency. Compared with the winding of the same volume, the flexible printed circuit board has a higher efficiency in obtaining electrical energy.

[0016] Preferably, the micro-generator of the present invention further comprises a carbon brush, and a first end surface of the carbon brush abuts against the rectifier.

[0017] Preferably, the micro-generator of the present invention further comprises a fixer, the fixer is fixed to the second end cover, and the carbon brush is fixed by the fixer.

[0018] A spring is arranged in the fixer; one end of the spring is fixed to the second end surface of the carbon brush, and the other end of the spring is fixed to the adjusting bolt, and the spring is adjusted by the adjusting bolt to squeeze and fix the carbon brush.

[0019] In one aspect of the present invention, the holder is fixed on the second end cover to ensure the stability of the second holder. In another aspect, a spring is arranged inside the holder to keep the carbon brush in contact with the rectifier at all times, thereby avoiding the disconnection of the carbon brush from the rectifier due to the wear of the carbon brush, and by adjusting the length of the carbon brush with the spring, the micro-generator can use carbon brushes of different specifications.

[0020] Another aspect of the present invention is to provide a flexible printed circuit board, wherein the flexible printed circuit board is used to be fixed on the iron core of the micro-generator rotor;

[0021] The flexible printed circuit board forms a serpentine conductor after opening a window, and the serpentine conductor is uniformly coated with silver paste to increase the thickness of the serpentine conductor;

[0022] When the rotor rotates, the serpentine conductor cuts the magnetic flux lines formed by the permanent magnet, and an induced current is formed in the serpentine conductor.

[0023] The present invention adopts a flexible printed circuit board to replace the winding rotor, so that the size of the generator rotor is greatly reduced, which solves the problem that the micro generator rotor is difficult to put into the stator and greatly reduces the structure of the generator.

[0024] The serpentine conductor of the flexible printed circuit board of the present invention can increase the reflection area of ​​cutting magnetic flux lines and improve the efficiency of the micro-generator in acquiring electric energy.

[0025] The present invention uses a serpentine wire on a flexible printed circuit board to replace the copper wire winding, cut the magnetic flux lines, and thus obtain current. The serpentine wire on the flexible printed circuit board is coated with a uniform silver paste to enhance the cutting effect. The flexible printed circuit board is used as a reactant for electromagnetic induction, and the serpentine wire is uniformly coated with silver paste to increase the reaction area, which can greatly increase the power generation efficiency. Compared with the copper wire winding of the same volume, the flexible printed circuit board has a higher efficiency in obtaining electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 Schematic diagram of the overall structure of the micro-generator of the present invention.

[0028] Figure 2 It is a side schematic diagram of the micro-generator of the present invention.

[0029] Figure 3 for Figure 2 Top view of the .

[0030] Figure 4 The figure is a schematic diagram of fixing the iron core, the rotating shaft and the rectifier of the micro-generator of the present invention.

[0031] Figure 5 This is a schematic diagram of fixing the carbon brush and rectifier of the micro-generator of the present invention.

[0032] Figure 6 Schematic diagram of the housing of the micro-generator of the present invention.

[0033] Figure 7 Schematic diagram of the permanent magnet of the micro-generator of the present invention.

[0034] Figure 8 It is a schematic diagram of the development of the flexible printed circuit board of the micro-generator of the present invention.

[0035] Fig. 9 It is a schematic diagram of the curling of the flexible printed circuit board of the micro-generator of the present invention.

[0036] Fig.10 It is a schematic diagram of the splicing of two flexible printed circuit boards of the micro-generator of the present invention.

[0037] Fig.11 It is a side view of the connection end of two flexible printed circuit boards.

[0038] Fig.12 yes Fig.11 Left view of .

[0039] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0040] 1. Shell, 2. First end cover, 3. Second end cover, 4. Bolt hole, 5. Rotating shaft, 6. Rectifier, 7. Iron core, 8. Fixer, 9. Carbon brush, 10. Spring, 11. Adjusting bolt, 12. One end of the spring, 13. The other end of the spring, 14. First end face, 15. Second end face, 16. Fixing bolt, 17. Permanent magnet (stator), 18. Keyway, 19. Arc surface, 20. Flexible printed circuit board, 20a. First flexible printed circuit board, 20b. Second flexible printed circuit board, 21. Two spliced ​​flexible printed circuit boards, 22. Serpentine wire, 23. Drainage wire, 24. Edge of flexible printed circuit board, 25. Connecting plate, 26. First connecting end, 27. Second connecting end. DETAILED DESCRIPTION

[0041] In order to make the above and other features and advantages of the present invention more clear, the present invention is further described below in conjunction with the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explaining to those skilled in the art and are only exemplary and not restrictive.

[0042] In the following description, many specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that specific details are not required to practice the present invention. In other cases, well-known steps or operations are not described in detail to avoid obscuring the present invention.

[0043] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0048] In order to solve the technical problems of the prior art micro-generator's requirements on structural dimensions and low power generation efficiency, a micro-generator is provided according to an embodiment of the present invention. Figures 1 to 12 The structure, function and working principle of the micro-generator in the specific embodiment are given in detail. It should be understood that the embodiment is only an exemplary display, and those skilled in the art can make specific expansions without departing from the scope of the claims.

[0049] like Figure 1 The overall structure diagram of the micro-generator of the present invention is shown in FIG. Figure 2 The side view of the micro-generator of the present invention is shown in FIG. Figure 3 Shown Figure 2A top view of the micro-generator. According to an embodiment of the present invention, a micro-generator includes: the micro-generator includes a shell 1. The shell 1 in this embodiment is a shell with a cylindrical outer surface. In some embodiments, the outer surface of the shell 1 can be in the shape of other structures, such as a rectangular shell. End covers are fixed at both ends of the shell 1. Specifically, in this embodiment, the micro-generator also includes a first end cover 2 and a second end cover 3. The first end cover 2 and the second end cover 3 are respectively fixed to the two ends of the shell 1. In this embodiment, a bolt hole 4 is provided on the first end cover 2, a bolt hole is provided on the second end cover 3, and a bolt hole is also provided on the shell 1. The first end cover 2 is fixed to one end of the shell 1 by bolts, and the second end cover 3 is fixed to the other end of the shell 1.

[0050] Figure 4 The schematic diagram of fixing the iron core, rotating shaft and rectifier of the micro-generator of the present invention is shown. According to an embodiment of the present invention, the micro-generator includes a rotor, and the rotor includes an iron core 7, and the outer surface of the iron core 7 is covered and fixed by at least two flexible printed circuit boards (the flexible printed circuit board of the present invention is described in detail below).

[0051] The first end of the iron core 7 is fixed with the rotating shaft 5 , and the rotating shaft extends out of the first end cover 2 ; the second end of the iron core is fixed with the rectifier 6 , and the rectifier 6 extends out of the second end cover 3 .

[0052] According to an embodiment of the present invention, after the rectifier 6 extends out of the second end cover 3, the carbon brush is connected to the rectifier 6 through the fixture. Figure 5 The micro-generator carbon brush and rectifier fixing schematic diagram of the present invention is shown, the micro-generator includes a fixing 8 and a carbon brush 9, the first end surface 14 of the carbon brush 9 abuts against the rectifier 6, and the carbon brush 9 is fixed by the fixing 8. According to the present invention, the fixing 8 is fixed to the second end cover 3. In this embodiment, the fixing bolt 16 is used to fix the fixing 8 to the second end cover 3 (such as Figure 2 / Figure 3 shown).

[0053] According to the embodiment of the present invention, a spring 10 is arranged in the holder 8, one end 12 of the spring is fixed to the second end face 15 of the carbon brush 9, and the other end 13 of the spring is fixed to the adjusting bolt 11, and the spring 10 is adjusted by adjusting the bolt 11 to squeeze and fix the carbon brush 9. For example, during the operation of the generator, the carbon brush 9 is worn, and the length of the carbon brush 9 is adjusted by adjusting the bolt 11 so that the carbon brush 9 always maintains abutment and communication with the rectifier 6.

[0054] According to an embodiment of the present invention, a guide wire (not shown in the figure) is led out from the second end face 15 of the carbon brush 9 and is led from the inside of the spring 8 to the top of the spring 10 for connection. A wire is set at the top of the spring to output the current of the generator.

[0055] like Figure 6 The schematic diagram of the housing of the micro-generator of the present invention is shown in FIG. Figure 7 Schematic diagram of the permanent magnet of the micro-generator of the present invention is shown. As described above, the housing 1 in this embodiment is a cylindrical housing, and the stator is embedded in the housing. In this embodiment, a plurality of keys 28 are arranged on the inner surface of the housing 1, and a plurality of key slots 18 corresponding to the keys 28 are provided on the outer surface of the stator (permanent magnet) 17, and the stator 17 is fixed to the inner cavity of the housing 1 by surface mounting.

[0056] According to an embodiment of the present invention, the stator 17 of the micro-generator is a hollow permanent magnet, or a hollow component formed by splicing a plurality of permanent magnets with internal curved surfaces. In some embodiments, the stator 17 can be a cylindrical permanent magnet with a hollow interior, and a keyway 18 is provided on the outside of the stator to be fixed to the inner cavity of the housing 1. In this embodiment, preferably, two permanent magnets with internal curved surfaces 19 are selected to be spliced ​​into a hollow cylinder. The permanent magnet is made of aluminum nickel cobalt and is fixed to the inner cavity of the housing 1 by axial pushing and surface mounting.

[0057] The following is a detailed embodiment of the flexible printed circuit board of the micro-generator of the present invention. The rotor includes an iron core 7, which is inserted into the hollow inside of the stator. The outer surface of the iron core 7 is covered and fixed by at least two flexible printed circuit boards. Figure 8 The schematic diagram of the unfolding of the flexible printed circuit board of the micro-generator of the present invention is shown. Fig. 9 The curling schematic diagram of the flexible printed circuit board of the micro-generator of the present invention is shown in FIG. The protruding wire parts on the flexible circuit board are all covered with a polyvinyl chloride skin. The wire part 20 on the flexible circuit board of the present invention is formed into a serpentine wire 22 after opening a window. The end of the serpentine wire 22 extends to the edge 24 of the flexible printed circuit board and is fixedly connected to the drainage wire 23. The drainage wire 23 is connected to the rectifier 6 (such as Figure 5 It should be understood that when the flexible printed circuit board 20 is covered and fixed on the iron core 7, the serpentine conductor 22 is perpendicular to the magnetic field of the stator (permanent magnet).

[0058] When the rotor rotates, the serpentine wire 22 cuts the magnetic flux lines formed by the stator (permanent magnet), forming an induced current in the serpentine wire 22. The induced current is respectively led out from the lead wire 23, flows into the rectifier 6, obtains a voltage with the same direction through the carbon brush 9, and is output by the micro generator.

[0059] The width h of the flexible printed circuit board 20 of the present invention is determined according to the cross-sectional perimeter of the iron core 7 covered by it. Flexible printed circuit boards 20 with different widths h can be selected for different iron cores. Within the scope defined by the claims determined by the present invention, two or more flexible printed circuit boards 20 can be selected to be spliced ​​and covered on the outer surface of the iron core 7. The flexible printed circuit board 20 is firmly connected to the iron core 7, which effectively reduces the radial size of the micro-generator.

[0060] In some preferred embodiments, silver paste is evenly applied on the serpentine wire 22 to increase the thickness of the serpentine wire 22. The serpentine wire 22 on the flexible printed circuit board 20 is evenly coated with silver paste to enhance the cutting effect. At the same time, the serpentine wire 22 is evenly coated with silver paste to increase the reaction area, which can greatly increase the power generation efficiency. Compared with the copper wire winding of the same volume, the flexible printed circuit board 20 has a more efficient power acquisition capability.

[0061] In some more preferred embodiments, the silver paste evenly coated on the serpentine conductor 22 forms protrusions on the surface of the flexible printed circuit board 20, further ensuring the effect of the serpentine conductor in cutting the magnetic flux lines and increasing the area of ​​the reaction of cutting the magnetic flux lines.

[0062] like Fig.10 The schematic diagram of the splicing of two flexible printed circuit boards of the micro-generator of the present invention is shown. Fig.11 The side view of the connection end of two flexible printed circuit boards is shown. Fig.12 Shown Fig.11 Left view. According to an embodiment of the present invention, at least two flexible printed circuit boards 20 are covered and fixed on the iron 7 of the rotor. In this embodiment, an example of splicing two flexible printed circuit boards is exemplarily given. It should be understood that the splicing method of the printed circuit boards is not limited to the method defined in this specification. In this embodiment, the flexible printed circuit board covered on the iron core 7 includes a first flexible printed circuit board 20a and a second flexible printed circuit board 20b. In this embodiment, the first flexible printed circuit board 20a and the second flexible printed circuit board 20b are spliced ​​with each other through a connecting plate 25 to form two spliced ​​flexible printed circuit boards 21. The connecting plate 25 is a semicircular structure, having a first connecting end 26 and a second connecting end 27. The first connecting end 26 is fixed to one side edge of the second flexible printed circuit board 20b, and the second connecting end 27 is fixed to one side edge of the first flexible printed circuit board 20a. It should be noted that in some preferred embodiments, the connecting plate 25 is a connecting wire with an insulating skin.

[0063] The lead wires 23 of the first flexible printed circuit board 20a and the second flexible printed circuit board 20b extend to the rectifier 6 and are in contact with and connected to the rectifier.

[0064] The present invention drives the rotor shaft to rotate through external energy input (such as wind, water flow, etc.), and the flexible printed circuit board fixed on the rotor shaft is opened to form a serpentine wire, which is coated with silver paste to increase the thickness. The rotation of the rotor drives the flexible circuit board to rotate, and the serpentine wire on the flexible circuit board cuts the magnetic field provided by the permanent magnet to generate an induced current. The induced current is led out through the serpentine wire and the drainage wire on the flexible circuit board and flows into the rectifier. The rectifier outputs the current to the storage medium through the carbon brush.

[0065] The present invention aims to solve the problems of existing generators, such as large size, complex structure, limited application scenarios, and insufficient power generation efficiency. The present invention mentions the windings through the flexible circuit board after opening the window, uses permanent magnets as the excitation stator, provides a magnetic field, and converts kinetic energy into electrical energy through external input through a DC generator. The serpentine wire of the flexible printed circuit board of the present invention can increase the reflection area of ​​cutting magnetic flux lines and improve the efficiency of the micro-generator in obtaining electrical energy. The present invention replaces the copper wire windings with the serpentine wires on the flexible printed circuit board to cut the magnetic flux lines, thereby obtaining current. The serpentine wires on the flexible printed circuit board are coated with a uniform silver paste to enhance the cutting effect. The flexible printed circuit board is used as a reactant for electromagnetic induction. The serpentine wires are evenly coated with silver paste to increase the reaction area, which can greatly increase the power generation efficiency. Compared with copper wire windings of the same volume, the flexible printed circuit board has a higher efficiency in obtaining electrical energy.

[0066] The various technical features described above can be combined arbitrarily. Although all possible combinations of these technical features are not described, any combination of these technical features should be considered to be covered by this specification as long as there is no contradiction in such combination.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A micro generator, characterized in that: The micro generator comprises: A stator, wherein the stator is a hollow permanent magnet, or the stator is a hollow component formed by splicing a plurality of permanent magnets with internal curved surfaces; A rotor, the rotor comprising a hollow iron core inserted into the stator, the outer surface of the iron core being covered and fixed by at least two flexible printed circuit boards; The flexible printed circuit board forms a serpentine wire after the window is opened, and the end of the serpentine wire extends to the edge of the flexible printed circuit board and is fixedly connected to the drainage wire; when the rotor rotates, the rotor drives the flexible printed circuit board to rotate and causes the serpentine wire to cut the magnetic flux lines formed by the permanent magnet, forming an induced current in the serpentine wire, so the induced current is led out through the drainage wire; The uniform silver paste on the serpentine wire increases the thickness of the serpentine wire and forms a protrusion on the surface of the flexible printed circuit board.

2. The micro-generator according to claim 1, characterized in that: The micro-generator further comprises a shell, and the stator is embedded in the shell.

3. The micro-generator according to claim 2, characterized in that: A plurality of keys are arranged on the inner surface of the shell, a plurality of key slots corresponding to the keys are provided on the outer surface of the stator, and the stator is fixed in the shell by surface mounting.

4. The micro-generator according to claim 2, characterized in that: The micro-generator further includes a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively fitted and fixed to two ends of the shell.

5. The micro-generator according to claim 4, characterized in that: A rotating shaft is fixed to the first end of the iron core, and the rotating shaft extends out of the first end cover; The second end of the iron core is fixed with a rectifier, and the current-guiding wire is connected with the rectifier; The rectifier extends out of the second end cover.

6. The micro-generator according to claim 5, characterized in that: The micro-generator further includes a carbon brush, and a first end surface of the carbon brush abuts against the rectifier.

7. The micro-generator according to claim 6, characterized in that: The micro-generator further comprises a fixer, which is fixed to the second end cover, and the carbon brush is fixed by the fixer.

8. The micro-generator according to claim 7, characterized in that: A spring is arranged in the fixer; One end of the spring is fixed to the second end surface of the carbon brush, and the other end of the spring is fixed to the adjusting bolt. The spring is adjusted by the adjusting bolt to squeeze and fix the carbon brush.

9. A flexible printed circuit board, characterized in that: The flexible printed circuit board is used to be fixed on the iron core of the micro-generator rotor according to any one of claims 1 to 8; The flexible printed circuit board forms a serpentine conductor after opening a window, and the serpentine conductor is uniformly coated with silver paste to increase the thickness of the serpentine conductor; When the rotor rotates, the serpentine conductor cuts the magnetic flux lines formed by the permanent magnet, and an induced current is formed in the serpentine conductor.

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