CN104883026B - Roll vibrator linear vibration energy collecting device - Google Patents

Abstract

A rolling vibrator linear vibration energy collection device. There are two bottom yokes on the permanent magnet. Each bottom yoke has two coil bases for placing coil supports. Four coil supports are placed on the coil bases. The bottom corresponding to the N pole is The yoke is used to place the left coil support and the rear coil support, and the bottom yoke corresponding to the S pole is used to place the right coil support and the front coil support. The four coil supports are identical; The induction coils are connected in series, and the four coil supports are equipped with a yoke base for placing four yokes. Each yoke has teeth, and the width of the bottom of the tooth is the same as that of the top of the tooth. The left and right yokes are the same as the front and rear. The teeth on the yoke are distributed in a staggered manner; spherical vibrators are arranged in the cavity surrounded by the front and rear yokes and the left and right yokes, and the top of each yoke is connected with the yoke bracket. The invention provides a rolling vibrator linear vibration energy collection device with less magnetic flux leakage, higher energy conversion rate, small friction coefficient and good stability.

Description

Linear Vibration Energy Harvesting Device of Rolling Vibrator

technical field

The invention relates to an energy harvesting device, in particular to an electromagnetic vibration energy harvesting device.

Background technique

The problem of powering wireless sensor networks or distributed small systems is a difficult point. Vibration is a form of energy in nature. For example, the waves of the sea, the swing of branches in the wind, bumpy vehicles, etc. Vibration power generation is to convert the energy generated by various vibrations into electrical energy. It is a potential new power generation device that is pollution-free and does not consume natural resources. It is suitable for wireless sensor networks or distributed small system nodes.

One way to achieve vibration power generation is through the phenomenon of electromagnetic induction. Conventional electromagnetic induction vibration power generation devices have different internal structures. The vibration generator with application number 200410067821.3, the three-dimensional vibration generator with application number 200810230833.1, the portable vibration generator with application number 200710126703.9, the magnetic field extrusion enhanced vibration generator with application number 200610051677.3. Thesis "Research on the Performance of a New Type of Permanent Magnet Built-in Linear Vibration Generator" (Journal of Zhejiang University Engineering Science Edition, Vol. . The utilization rate is not high, and the vibration energy utilization rate is not high. At the same time, the coil utilization rate in some of the above materials is also a point that can be improved. Many parts of the coil cannot effectively cut the magnetic force lines, generate electromotive force, and affect the power generation efficiency. The surrounding vibration generator with the application number 201020125287.8 has four S poles of permanent magnets distributed symmetrically in a cross, and its bottoms are connected together and connected to the N poles. This has high requirements on the manufacturing process and is very difficult to manufacture. Simultaneously, because the coil is installed between the N pole and the S pole, the overall structure and structure are relatively complicated, even if the permanent magnet can be manufactured, it is difficult to install. Moreover, since there is a coil between the N pole and the S pole, the air gap in the magnetic circuit is still relatively large, which may cause the magnetic circuit to fail to close or the induced magnetic flux to be weak, resulting in less electric energy, which is a problem for high manufacturing costs. It's not worth the candle. The electromagnetic vibration power generation device with the application number 2012104994623 tries to eliminate the positioning force by balancing the magnetic force, but because the magnetic force in the first device is much greater than the gravity, and due to the existence of errors and asymmetry, the positioning force cannot be avoided to a certain extent. On the other hand, its permanent magnet belongs to the vibrator, which is easy to be broken during vibration.

Contents of the invention

In order to overcome the deficiencies of high magnetic flux leakage, low energy conversion rate and unstable use of the device in the existing vibration energy collection method, the present invention provides an A rolling vibrator linear vibration energy harvesting device with good friction and stability.

The technical solution adopted by the present invention to solve its technical problems is:

A linear vibration energy collection device of a rolling vibrator, comprising a housing, and the energy collection device also includes a permanent magnet located in the housing, a bottom yoke, a coil support, front and rear yokes, and left and right yokes

The permanent magnet has an N pole and an S pole, and there are two bottom yokes on the permanent magnet, and each bottom yoke has two coil bases for placing coil supports, and four coil supports are placed on the coil bases, The bottom yoke corresponding to the N pole is used to place the left coil support and the rear coil support, the bottom yoke corresponding to the S pole is used to place the right coil support and the front coil support, and the four coil supports are identical;

Induction coils are wound on the coil supports, and the induction coils on each coil support are connected in series. The four coil supports are provided with a yoke base for placing four yokes, and the left yoke is placed on the left coil support, which is placed on The right yoke is on the right coil support, the front yoke is placed on the front coil support, and the rear yoke is placed on the rear coil support. The left yoke and the right yoke are placed opposite and identical. The front yoke It is placed opposite to the rear yoke and is exactly the same. There are teeth on each piece of yoke, the width of the bottom of the tooth is the same as that of the top of the tooth, and the teeth on the left and right yokes are staggered with the teeth on the front and rear yokes; the front and rear yokes A spherical vibrator is arranged in the cavity surrounded by the left and right yokes, and the top of each yoke is connected with the yoke bracket.

Further, the upper part of the yoke bracket is an elastic washer.

There are four guide rails inside the housing, and the guide rails are used to fix the circumferential positions of the yoke, the coil support and the bottom yoke, that is, each yoke is located in the gap between the guide rails, and each coil support is located in the gap between the guide rails There are grooves on the arc surface of the two bottom yokes just for embedding two facing guide rails; a spherical vibrator is placed between the four guide rails, and the vibrator is in rolling contact with the guide rails.

There is a top cover on the top of the shell, the top cover is made of non-magnetic material, there are external threads on the outside of the top of the shell, and there are external threads on the inside of the top cover.

The technical idea of the present invention is: in the present invention, under the action of vibration, the vibrator rolls on the housing guide rail, the yoke and the vibrator move relative to each other, the magnetic flux of the coil changes continuously, and the coil can generate an induced voltage. To illustrate this variation, consider the following two scenarios:

1) During the vibrating and rolling process of the vibrator along the guide rail, there is always a great circle on the surface of the spherical vibrator that is tangent to the surface of the guide rail. When the great circle is in direct alignment with the middle positions of the tooth tops of the left and right yokes, the magnetic lines of force are emitted from the N pole of the permanent magnet, passing through the bottom yoke, the left coil support, the left yoke, the air gap, the spherical vibrator, the air gap, and the right magnet. The yoke, the right coil support, and the S pole of the permanent magnet form a closed magnetic circuit. In this situation, the magnetic fluxes in the coils on the left and right coil supports reach the maximum, while the magnetic fluxes in the coils on the front and rear yokes are zero.

2) When the spherical vibrator moves upwards, the large circle where the surface of the spherical vibrator is tangent to the surface of the guide rail is facing the front and rear yokes. The magnetic lines of force are emitted by the permanent magnet N, and return to the S pole of the permanent magnet through the rear coil support, the rear yoke, the air gap, the spherical vibrator, the air gap, the front yoke, and the rear coil support to form a closed magnetic circuit. In this case, the magnetic fluxes in the coils on the front and rear yokes reach the maximum, while the magnetic fluxes in the coils on the left and right yokes decrease from the original maximum value to 0.

The above analysis shows that during the rolling process of the spherical vibrator, the magnetic fluxes in the coils of the relative yokes are constantly changing, and the law is that the magnetic fluxes in the coils on the front and rear yokes are equal in magnitude and opposite in direction; the magnetic fluxes in the coils on the left and right yokes The fluxes are equal in magnitude and opposite in direction; the sum of the absolute value of the magnetic flux in the coil on the front and rear yokes and the absolute value of the magnetic flux in the coil on the left and right yokes is a constant, showing that the front and rear are long and the left and right disappear and the left , the right side is long then the relation of disappearing before and after. Therefore, a reasonable series connection of 4 coils can superimpose the induced electromotive force of each coil. For example, if the upper part of each coil is set as forward, then the left coil is connected in reverse series to the rear coil, reversely connected in series to the right coil, and connected in series in the same direction. front coil.

Examining the axial force of the yoke on the vibrator, when the vibrator gradually deviates from the tooth tops of the left and right yokes, the axial components of the magnetic force generated by the left and right yokes on the vibrator tend to pull it back, but at this time, the front and rear yokes also produce a force on the vibrator Due to the symmetry of the attracting magnetic force, the axial component of the magnetic force is theoretically balanced with the axial component of the left and right yokes, so the positioning magnetic force is eliminated in principle.

At the same time, it is also necessary to investigate the positioning problem caused by the friction force in the movement of the vibrator generated by the magnetic force. In the present invention, due to the symmetry of the left and right yokes and the symmetry of the front and rear yokes, the radial magnetic forces on the vibrator can theoretically balance each other, but the total radial magnetic force still exists to a certain extent due to processing errors and other reasons. In the device, the guide rails on the housing limit the displacement of the vibrator in the radial direction, and limit the increase of the total radial magnetic force; then use the rolling vibrator to reduce friction, further eliminate the positioning force caused by the total radial magnetic force through friction, and improve the vibration of the vibrator. Movement flexibility.

The beneficial effects of the present invention: the utilization rate of the magnetic circuit is improved, the coil utilization rate is improved, the energy collection efficiency and the service life of the equipment are improved; the symmetrical structure is used in the structural design, and the spherical vibrator is adopted at the same time to eliminate the positioning force to the greatest extent. The vibrator can move freely; the permanent magnet is fixed, and the vibrator is moving with rolling friction, and the friction coefficient is small.

Description of drawings

Fig. 1 is an internal structural diagram of a linear vibration energy harvesting device of a rolling vibrator.

Fig. 2 is a schematic diagram of a rolling vibrator linear vibration energy harvesting device (without a casing).

Fig. 3 is an appearance view of the linear vibration energy harvesting device of the rolling vibrator.

Fig. 4 is a schematic diagram of a bottom yoke.

Fig. 5 is a schematic diagram of a coil holder.

Fig. 6 is a schematic diagram of the front and rear yokes.

Fig. 7 is a schematic diagram of the housing.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

Referring to Figures 1 to 7, a rolling vibrator linear vibration energy harvesting device includes a housing 11, and the energy harvesting device also includes a permanent magnet 1 located in the housing, a bottom yoke 2, a coil support 3, front and rear yokes 5 and Left and right yokes 7;

The permanent magnet 1 has an N pole and an S pole. There are two bottom yokes 2 on the permanent magnet 1. There are two coil bases for placing coil supports on each bottom yoke 2. Four coil bases are placed on the coil bases. A coil support 3, the bottom yoke corresponding to the N pole is used to place the left coil support and the rear coil support, the bottom yoke corresponding to the S pole is used to place the right coil support and the front coil support, and the four coil supports 3 are identical;

The induction coil 4 is wound on the coil support 3, the induction coils on each coil support are connected in series, the four coil supports are provided with a yoke base for placing four yokes, and the left yoke is placed on the left coil support. The right yoke is placed on the right coil support, the front yoke is placed on the front coil support, and the rear yoke is placed on the rear coil support. The left yoke and the right yoke are placed opposite and identical. The yoke and the rear yoke are placed opposite to each other and are exactly the same. There are teeth on each piece of yoke, the width of the tooth bottom and the tooth top are the same, and the teeth on the left and right yokes are staggered with the front and rear yokes; A spherical vibrator 6 is arranged in the cavity surrounded by the yoke 5 and the left and right yokes 7 , and the top of each yoke is connected with the yoke bracket 8 .

Further, above the yoke bracket 8 is an elastic washer 9 .

There are four guide rails inside the housing 11, and the guide rails are used to fix the circumferential positions of the yoke, the coil support and the bottom yoke, that is, each yoke is located in the gap between the guide rails, and each coil support is located at the space between the guide rails. In the gap, there are grooves on the arc surface of the two bottom yokes, which are used to embed the two facing guide rails; a spherical vibrator is placed between the four guide rails, and the vibrator is in rolling contact with the guide rails.

There is a top cover 10 above the shell 11. The top cover 10 is made of non-magnetic material. There are external threads on the outside of the top of the shell and external threads on the inside of the top cover.

The permanent magnet 1 is a rectangular parallelepiped, with N poles on the left and S poles on the right. The permanent magnet 1 is made of ferrite permanent magnet material or rare earth permanent magnet material.

There are two bottom yokes 2, the lower part of which is connected to the N pole or S pole of the permanent magnet 1, and can be stuck on the permanent magnet 1. There is a groove on the upper part of the bottom yoke for placing the coil support 3. The arc surface has grooves, which can be embedded in the guide rails on the shell 11 .

The lower part of the coil support 3 is connected to the bottom yoke 2 and can be clamped on the bottom yoke 2 . The middle part of the coil support 3 is a cylinder for placing the coil 4 . There are also grooves on the upper part of the coil support 3 for placing the front and rear yokes 5 and the left and right yokes 7 .

The coil 4 is made of enamelled copper wire, wound around the middle part of the coil support 3, and there are 4 coils in total.

The front and rear yokes 5 and the left and right yokes 7 are placed on the coil support 3 respectively. The coil support 3 has grooves for placing the yokes, and the circumferential direction is positioned by guide rails on the casing 11 .

The yoke bracket 8 can be closely connected with the front and rear yokes 5, the left and right yokes 7 and the shell to keep the whole structure stable.

The spherical vibrator 6 is made of ferromagnetic material, and its shape is spherical so as to roll on the guide rail of the housing 11 .

The elastic washer 9 is placed between the yoke bracket 8 and the top cover 10 .

Described shell 11 can hold down whole device, and its side has four protruding guide rails, is convenient to fix front and rear yoke 5, left and right yoke 7 and yoke support 8.

In the present invention, a closed magnetic circuit can be formed. Under the action of external vibration, the spherical vibrator 6 keeps rolling. When the vibrator rolls on different yoke circuits, the magnetic flux of each magnetic circuit changes, and the magnetic flux sensed by the coil changes continuously, forming an alternating current. The four coils 4 are connected in series in a certain way through the wires, and then lead out through the wires to charge the battery to store electric energy. When the number of turns of the coil is larger, a higher alternating electromotive force can be generated. It can be seen that the device has a high utilization rate of the magnetic circuit and the coil, a high vibration energy conversion rate, and the equipment can continuously and effectively generate electricity.

The magnetic force lines emitted by the permanent magnets in the present invention can form a closed loop, and the device has a relatively high utilization rate of the magnets. Its advantages: first, the structure is simple, and the manufacture of each part is more convenient; second, the design is more reasonable, and the installation is more convenient; third, the utilization rate of the vibration of the vibrator is high, which improves the efficiency; Guarantee the free movement of the vibrator.

Claims (4)

1. A rolling vibrator linear vibration energy harvesting device, comprising a housing, characterized in that: the energy harvesting device also includes a permanent magnet, a bottom yoke, a coil support, front and rear yokes, and left and right yokes located in the housing; The permanent magnet has an N pole and an S pole, and there are two bottom yokes on the permanent magnet, and each bottom yoke has two coil bases for placing coil supports, and four coil supports are placed on the coil bases, The bottom yoke corresponding to the N pole is used to place the left coil support and the rear coil support, the bottom yoke corresponding to the S pole is used to place the right coil support and the front coil support, and the four coil supports are identical; Induction coils are wound on the coil supports, and the induction coils on each coil support are connected in series. The four coil supports are provided with a yoke base for placing four yokes, and the left yoke is placed on the left coil support, which is placed on The right yoke is on the right coil support, the front yoke is placed on the front coil support, and the rear yoke is placed on the rear coil support. The left yoke and the right yoke are placed opposite and identical. The front yoke It is placed opposite to the rear yoke and is exactly the same. There are teeth on each piece of yoke, the width of the bottom of the tooth is the same as that of the top of the tooth, and the teeth on the left and right yokes are staggered with the teeth on the front and rear yokes; the front and rear yokes A spherical vibrator is arranged in the cavity surrounded by the left and right yokes, and the top of each yoke is connected with the yoke bracket. 2. The linear vibration energy collection device of the rolling vibrator according to claim 1, characterized in that: the upper part of the yoke support is an elastic washer. 3. The rolling vibrator linear vibration energy harvesting device according to claim 1 or 2, characterized in that: there are four guide rails inside the housing, and the guide rails are used to fix the circumferential positions of the yoke, the coil support and the bottom yoke , that is, each yoke is located in the gap between the guide rails, and each coil support is located in the gap between the guide rails. A spherical vibrator is placed between them, and the vibrator is in rolling contact with the guide rail. 4. The rolling vibrator linear vibration energy harvesting device according to claim 2, characterized in that: there is a top cover on the top of the housing, the top cover is made of non-magnetic material, there are external threads on the outside of the top of the housing, and there are external threads on the inside of the top cover. The screw thread is fixed to the shell through the screw fit top cover, and compresses the elastic washer.