CN106953495B - A magnetically suspended friction-free vibration energy harvesting device - Google Patents

Abstract

The invention discloses a magnetic levitation type friction-free vibration energy collection device, which is composed of two parts: a casing cavity and a levitation magnet. Among them, the suspension magnet is in the form of a combined permanent magnet, with magnetic poles on the upper, lower, and side sides; the side of the casing cavity is wound with a generator coil. The levitating magnet is placed inside the shell cavity, and the magnetic poles on the upper and lower surfaces of the levitating magnet are opposite to the magnetic poles of the fixed magnets on the upper and lower covers of the shell cavity. According to the principle that the magnetic poles of the same name repel each other, the levitating magnet is suspended inside the shell cavity. The wall of the shell cavity is embedded with an array of lateral fixed magnets. The magnetic poles of the lateral fixed magnets pointing to the inner surface of the shell cavity are the same as the magnetic poles on the side of the levitating magnet. friction. When the energy harvesting device is in a vibrating environment, its internal suspended magnets vibrate relative to the housing cavity, and the power generation coil on the housing cavity cuts the magnetic field lines to generate electromotive force and realize the conversion of mechanical energy into electrical energy.

Description

A magnetically suspended friction-free vibration energy harvesting device

technical field

The invention belongs to the field of new energy, and in particular relates to a magnetic levitation type friction-free vibration energy collection device.

technical background

With the development of science and technology, people are using and developing new energy equipment to meet the needs of low-carbon life. In engineering practice and daily life, mechanical vibration is very common, such as shaking of vehicles, vibration of machine tools and tools, bumps when walking, etc. Because vibration energy is ubiquitous in the surrounding environment, it can provide a convenient and sufficient energy source for energy harvesters. Vibration energy harvesters can convert the mechanical vibration energy around the system into electrical energy.

According to the physical principle of vibration energy conversion, vibration energy harvesters are mainly divided into three types: electrostatic, piezoelectric and electromagnetic. Among them, the working principle of the electromagnetic vibration energy harvester is Faraday's law of electromagnetic induction. A typical electromagnetic vibration energy harvester is composed of a spring, a permanent magnet and an induction coil. The permanent magnet is connected to the spring and vibrates up and down under the action of an external vibration source, so that the magnetic flux in the induction coil changes with time and generates The electromotive force is induced, thereby converting the mechanical vibration energy in the environment into electrical energy. In this type of device, the spring itself buffers the vibration, consumes part of the vibration energy, and reduces the efficiency of energy conversion. In addition, based on the magnetic levitation energy harvester (M.P.S.Santos, etal.Sci.Rep.6, 18579(2016)), the selected permanent magnet is axially magnetized. Although the use of the spring structure is avoided, the magnet will vibrate Friction occurs with the inner cavity wall, and the vibration energy cannot be fully utilized.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention proposes a magnetic levitation friction-free vibration energy collection device.

The energy harvesting device includes two parts: a housing cavity and a levitating magnet.

The casing cavity is composed of a cavity 5, an upper cover 2 and a lower cover 6, forming a closed structure. Among them, the outer wall of the cavity 5 is wound with multi-strand copper coils 4; the inner side of the upper cover 2 is fixed with a radially magnetized upper fixed magnet 8, and the inner side of the lower cover 6 is fixed with a radially magnetized lower fixed magnet 14. The levitation magnet adopts a combined form, consisting of an upper levitation magnet 9 for radial magnetization, a radiation magnetization magnet 11 for radial magnetization and a lower levitation magnet 13 for radial magnetization.

The upper suspension magnet 9, the radiation magnetization magnet 11 and the lower suspension magnet 13 are combined and installed on the magnet fixing block 12; wherein, the radiation magnetization magnet 11 is set on the outside of the magnet fixing block 12, and the upper suspension magnet 9 and the lower suspension magnet 13 are respectively fixed At both ends of the magnet fixing block 12.

The levitated magnetons use the principle of repulsion of the magnetic poles of the same name to suspend in the interior of the shell cavity. Wherein, the upper fixed magnet 8 and the magnetic poles of the same name of the upper suspension magnet 9 repel each other; the lower suspension magnet 13 and the lower fixed magnet 14 of the same name poles repel each other; The fixed magnet 10 and the magnetic pole of the same name of the radiation magnetized magnet 11 repel each other.

The advantages of the magnetic levitation friction-free vibration energy harvesting device are:

① Utilize the principle that the magnetic poles of the same name of the permanent magnet repel each other to ensure that the magnets in the inner cavity of the device are opposite to each other with the same poles. In particular, the levitating magnet uses radiation magnetized magnets to repel the lateral fixed magnets with the same name poles on the cavity wall, and there is no friction with the cavity wall, effectively avoiding energy loss.

②Multi-strand copper coil windings are wound on the outer wall of the cavity, and the coil windings are all arranged at places where the magnetic lines of force are dense. Make full and effective use of the idle space of the device and add generating coils. The device has compact structure and high energy conversion efficiency.

③ The installation of the magnets is all connected by fastening bolts, which avoids the existence of unreliable factors such as glue adhesion in the prior art, eliminates the possibility of the magnets flying out due to the repulsive force, and ensures the safety of the device in use.

Description of drawings

Figure 1 is an isometric view of the energy harvesting device.

Fig. 2 is a cross-sectional view of the energy harvesting device.

Fig. 3 is a schematic diagram of the upper (or lower) fixed magnet poles of the energy harvesting device.

Fig. 4 is a schematic diagram of the laterally fixed magnet poles of the energy harvesting device.

Fig. 5 is a schematic diagram of the magnetic poles of the radiation magnetized magnet of the energy harvesting device.

Fig. 6 is a schematic diagram of the magnetic poles of the upper (or lower) suspension magnet of the energy harvesting device.

Among them: 1 fastening bolt, 2 upper cover, 3 lateral locking screw, 4 coil, 5 cavity, 6 lower cover, 7 magnet fixing bolt, 8 upper fixed magnet, 9 upper floating magnet, 10 lateral fixed magnet, 11 radiation magnetized magnets, 12 magnet fixing blocks, 13 suspension magnets, and 14 fixed magnets.

Detailed ways

The magnetic levitation type friction-free vibration energy harvesting device is composed of a housing cavity and a levitating magnet.

The levitation magnet includes an upper levitation magnet 9 , a radiation magnetizing magnet 11 , a magnet fixing block 12 and a lower levitation magnet 13 . Among them, the magnet fixing block 12 is a cylindrical structure; the radiation magnetizing magnet 11 is a ring structure, which is sleeved on the outside of the magnet fixing block 12, and the height of the radiation magnetizing magnet 11 and the magnet fixing block 12 is equal; the upper suspension magnet 9 and the lower suspension magnet The magnets 13 are respectively fixed to both ends of the magnet fixing block 12 by the magnet fixing bolts 7 , and simultaneously restrict the movement of the radiation magnetizing magnet 11 relative to the magnet fixing block 12 .

The housing cavity of the energy harvesting device includes a lateral locking screw 3 , a coil 4 , a cavity 5 and a lateral fixed magnet 10 , as well as an upper cover 2 , an upper fixed magnet 8 , a lower cover 6 and a lower fixed magnet 14 . Wherein, the cavity 5 is an annular cavity, and its outer wall is provided with a groove for winding the coil 4, and the wall is provided with a through hole for installing a laterally fixed magnet 10; the coil 4 is wound on the outside of the cavity 5; the laterally fixed The magnet 10 is tightly fitted in the through hole of the cavity wall and locked by the lateral locking screw 3 .

The upper fixed magnet 8 of the energy harvesting device is fixed on the inner side of the upper cover 2 through the magnet fixing bolt 7 , and the lower fixed magnet 14 is fixed on the inner side of the lower cover 6 through the magnet fixing bolt 7 .

When the energy harvesting device is installed, the levitation magnet is placed in the inner cavity of the cavity 5, and the upper cover 2 and the lower cover 6 are fixedly installed on both ends of the cavity 5 by fastening bolts 1, respectively.

Preferably, the cavity 5, the upper cover 2, the lower cover 6 and the magnet fixing block 12 are made of non-magnetic materials.

Preferably, the radiation magnetization magnet 11, the upper suspension magnet 9 and the lower suspension magnet 13 are NdFeB permanent magnet materials, wherein the radiation magnetization magnet 11 is a radiation type magnetization, the inside of which is an S pole, and the outside is an N pole; Both the suspension magnet 9 and the lower suspension magnet 13 are axially magnetized. Guarantee during installation, the N pole of upper suspension magnet 9 is upwards, and the S pole is downward; The N pole of lower suspension magnet 13 is downwards, and S pole is upwards. The outside of the levitated magneton of the energy harvester is an N pole.

Preferably, the lateral fixed magnet 10 is made of NdFeB permanent magnet material, and the magnetization direction is axial magnetization. During installation, the N pole of the laterally fixed magnet 10 faces inside the cavity 5 , and the S pole of the laterally fixed magnet 10 faces outside of the cavity 5 . The lateral fixed magnets 10 are arranged in double rows along the radial direction of the cavity 5 ; the quantity of the lateral fixed magnets 10 depends on the diameter of the cavity 5 .

Preferably, the upper fixed magnet 8 and the lower fixed magnet 14 are NdFeB permanent magnet materials, and the magnetization direction is axial magnetization. The N pole of the upper fixed magnet 8 is downward, and the S pole is upward; the N pole of the lower fixed magnet 14 is upward, and the S pole is downward.

The inside of the energy harvesting device forms magnetic poles N-N relative, and the upper fixed magnet 8 and the upper suspension magnet 9 have the same magnetic poles repelling each other, and the lower suspension magnet 13 and the lower fixed magnet 14 have the same magnetic poles that repel each other; the lateral fixed magnet 10 and the radiation magnetized magnet 11 magnetic poles with the same name repel each other. The levitation magnetons are realized to be suspended inside the cavity without any contact.

Preferably, the coil 4 is a copper coil. The idle space of the device is fully and effectively utilized, and multi-strand generating coils 4 are added, and the coils 4 are all arranged at places where the lines of magnetic force are dense.

When there is vibration in the outside world, the coil 4 of the energy harvesting device will cut the magnetic lines of force formed by the levitating magnetons, and convert the mechanical energy of the vibration into electrical energy. Among them, the middle coil mainly uses the magnetic field lines generated by cutting the radiating magnetizing magnet 11; the upper and lower coils mainly use the magnetic field lines generated by cutting the upper suspension magnet 9 and the lower suspension magnet 13 respectively.

The output voltage of the energy harvesting device satisfies:

Among them, N is the number of turns of the coil, Φ is the magnetic flux, and t is the time.

The above description is an explanation of the present invention, not a limitation of the present invention. The magnetic levitation friction-free vibration energy harvester can also be realized by changing the magnetization direction of the permanent magnet poles. Those skilled in the art who directly derive or associate other improvements or changes without departing from the basic idea of the present invention shall be deemed to be included in the protection scope of the present invention.

Claims (7)

1. The utility model provides a magnetic suspension formula exempts from friction vibration energy collection system which characterized in that: the magnetic suspension type friction-free vibration energy acquisition device comprises two parts, namely a suspension magnet and a shell cavity, wherein the suspension magnet comprises an upper suspension magnet (9), a radiation magnetizing magnet (11), a magnet fixing block (12) and a lower suspension magnet (13), the magnet fixing block (12) is of a cylindrical structure, the radiation magnetizing magnet (11) is of an annular structure and is sleeved on the outer side of the magnet fixing block (12), the height of the radiation magnetizing magnet (11) is equal to that of the magnet fixing block (12), and the upper suspension magnet (9) and the lower suspension magnet (13) are respectively fixed at two ends of the magnet fixing block (12) through magnet fixing bolts (7) and simultaneously limit the movement of the radiation magnetizing magnet (11) relative to the magnet fixing block (12); the shell cavity comprises a lateral locking screw (3), a coil (4), a cavity (5) and a lateral fixing magnet (10), as well as an upper cover (2), an upper fixing magnet (8), a lower cover (6) and a lower fixing magnet (14), wherein the cavity (5) is an annular cavity, a groove for winding the coil (4) is formed in the outer side wall of the cavity, a through hole for installing the lateral fixing magnet (10) is formed in the wall of the cavity, the coil (4) is wound on the outer side of the cavity (5), the lateral fixing magnet (10) is tightly matched and installed in the through hole in the cavity wall and is locked through the lateral locking screw (3), the upper fixing magnet (8) is fixedly arranged on the inner side of the upper cover (2) through a magnet fixing bolt (7), and the lower fixing magnet (14) is fixedly arranged on the inner side of the lower cover (6) through the magnet fixing bolt (7); the suspended magnet is placed in the inner side cavity of the cavity (5), the upper cover (2) and the lower cover (6) are fixedly installed at two ends of the cavity (5) through the fastening bolts (1) respectively, and the magnet on each surface on the outer side of the suspended magnet is in the state of being in the same-name magnetic pole repulsion with the magnet on the opposite surface on the inner side of the shell cavity respectively, so that the suspended magnet is prevented from being in contact with the shell cavity.

2. The magnetic levitation type friction-free vibration energy harvesting device of claim 1, wherein: the radiation magnetizing magnet (11), the upper suspension magnet (9) and the lower suspension magnet (13) are made of neodymium-iron-boron permanent magnet materials, wherein the radiation magnetizing magnet (11) is radiation magnetizing, and the upper suspension magnet (9) and the lower suspension magnet (13) are axially magnetizing.

3. The magnetic levitation type friction-free vibration energy harvesting device of claim 1, wherein: the lateral fixed magnets (10) are made of neodymium-iron-boron permanent magnet materials, and the magnetizing direction is axial magnetizing; the lateral fixed magnets (10) are arranged in double rows and are arranged along the radial direction of the cavity (5), and the number of the lateral fixed magnets (10) is determined according to the diameter of the cavity (5).

4. The magnetic levitation type friction-free vibration energy harvesting device of claim 1, wherein: the upper fixed magnet (8) and the lower fixed magnet (14) are made of neodymium iron boron permanent magnet materials, and the magnetizing direction is axial magnetizing.

5. The magnetic levitation type friction-free vibration energy harvesting device of claim 1, wherein: the magnetic poles N-N or S-S are opposite, the upper fixed magnet (8) and the upper suspension magnet (9) repel each other, and the lower suspension magnet (13) and the lower fixed magnet (14) repel each other; the lateral fixed magnet (10) and the radiation magnetizing magnet (11) repel each other with the same-name magnetic poles, so that the levitation magnet is levitated inside the cavity without any contact.

6. The magnetic levitation type friction-free vibration energy harvesting device of claim 1, wherein: the cavity (5), the upper cover (2), the lower cover (6) and the magnet fixing block (12) are made of non-magnetic materials.

7. The magnetic levitation type friction-free vibration energy harvesting device of claim 1, wherein: the coil (4) is a copper coil, and a plurality of strands of coils (4) are additionally arranged on the outer wall of the cavity (5).

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