阅读说明：本技术 压电与磁电复合式微型风力发电机 (Piezoelectric and magnetoelectric combined type miniature wind driven generator ) 是由 郭麟阁 吴锦 吴想 陈远晟 王浩 陈常顺 陶如意 王舟 黄勤斌 陈威 顾聪 赵 于 2020-04-24 设计创作，主要内容包括：本发明公开了一种压电与磁电复合式微型风力发电装置,包括若干压电陶瓷片、金属基板、钝体,所述若干压电陶瓷片相对设置在金属基板的两个表面,每片压电陶瓷片与金属基板之间固定两根导线,导线固定端端头与压电陶瓷片连接,所述钝体固定在金属基板的一端。本发明结构简单,共振频率高,在较低的风速下就可以达到装置振动的要求,在自然环境中能更好的回收风能。(The invention discloses a piezoelectric and magnetoelectric combined type micro wind power generation device which comprises a plurality of piezoelectric ceramic pieces, a metal substrate and a bluff body, wherein the piezoelectric ceramic pieces are oppositely arranged on two surfaces of the metal substrate, two wires are fixed between each piezoelectric ceramic piece and the metal substrate, the end of the fixed end of each wire is connected with the piezoelectric ceramic piece, and the bluff body is fixed at one end of the metal substrate. The wind power generator has the advantages of simple structure and high resonance frequency, can meet the requirement of vibration of the device at lower wind speed, and can better recover wind energy in natural environment.)

1. The utility model provides a miniature wind power generation set of piezoelectricity and magnetoelectricity combined type, its characterized in that includes a plurality of piezoceramics pieces (2), metal substrate (1), blunt body (3), a plurality of piezoceramics pieces (2) set up two surfaces at metal substrate (1) relatively, two fixed wires between every piezoceramics piece (2) and metal substrate (1), and the wire stiff end is connected with piezoceramics piece, the one end at metal substrate is fixed in blunt body (3).

2. The piezoelectric and magnetoelectric composite type micro wind power generation device according to claim 1, wherein the blunt body comprises a cuboid base body (3-1) and a plurality of through holes (3-2) arranged on the cuboid base body (3-1), the through holes are perpendicular to the connecting portion of the metal substrate (1) and the cuboid base body (3-1), coils are spirally wound in the through holes (3-2) along the hole wall, and magnets are arranged in the through holes (3-2).

3. The piezoelectric and magnetoelectric composite type miniature wind power generation device according to claim 2, wherein snap springs are mounted at both ends of the through hole.

4. The piezoelectric and magnetoelectric composite type micro wind power generation device according to claim 1, wherein a central axis of one end of the blunt body (3) is grooved for being tightly connected with a metal substrate.

5. The piezoelectric and magnetoelectric composite miniature wind power generation device according to claim 4, wherein the magnet length is L/3, and L is the through hole length.

6. The piezoelectric and magnetoelectric composite type miniature wind power generation device according to claim 3, wherein the direction of the magnetic induction lines inside the magnet is the same as the axis of the coil.

Technical Field

The invention belongs to the field of wind power generation, and particularly relates to a piezoelectric and magnetoelectric combined type miniature wind driven generator.

Background

Wind-induced vibration is a power generation mode for converting object vibration caused by wind power into electric energy. The wind energy saves labor force, and has huge content, high conversion rate, little pollution and strong economic benefit, thereby becoming one of the main development directions of the new energy industry in the 21 st century. The conventional wind power generation system can only participate in the power generation of a high-power device, but is difficult to be applied to a low-power generation device.

The existing wind power generation device is generally large in scale, can only be used in an open plain area, and has high requirements on geographical conditions. The utilization rate of wind energy by wind power generation is strongly influenced by the environment, and the generating efficiency of the existing wind power generation device can not be ensured when the wind power is small. The miniature wind power generation device is generally used in non-flat areas, and the existing miniature power generation device generally adopts a small solar panel, but is closely related to illumination and has limitation. The small wind driven generator is difficult to miniaturize, has more parts, limited reliability and difficult maintenance.

Disclosure of Invention

The invention aims to provide a piezoelectric and magnetoelectric combined type miniature wind driven generator.

The technical solution for realizing the purpose of the invention is as follows: the utility model provides a miniature aerogenerator of piezoelectricity and magnetoelectricity combined type, includes a plurality of piezoceramics pieces, metal substrate, blunt body, a plurality of piezoceramics pieces set up two surfaces at metal substrate relatively, two fixed wires between every piezoceramics piece and the metal substrate, and the wire stiff end is connected with piezoceramics piece, the one end at metal substrate is fixed to the blunt body.

Preferably, the bluff body includes the cuboid base member and sets up a plurality of through-holes on the cuboid base member, the connecting portion of through-hole perpendicular to metal substrate and cuboid base member is the heliciform along the pore wall in the through-hole and winds there is the coil, is provided with magnet in the through-hole.

Preferably, snap springs are installed at two ends of the through hole.

Preferably, one end of the blunt body has a central axis that is grooved for tight connection with a metal substrate.

Preferably, the magnet length is L/3, L is the through hole length.

Preferably, the direction of the lines of magnetic induction inside the magnet is the same as the coil axis.

Compared with the prior art, the invention has the following remarkable advantages: the wind power generator has the advantages of simple structure and high resonance frequency, can meet the requirement of vibration of the device at lower wind speed, and can better recover wind energy in natural environment.

The present invention is described in further detail below with reference to the attached drawings.

Drawings

Fig. 1 is a schematic view of a piezoelectric and magnetoelectric composite type micro wind driven generator.

Fig. 2 is a sectional view of a blunt body.

Fig. 3 is a three-dimensional perspective view of the device.

Detailed Description

As shown in fig. 1 and 2, a piezoelectric and magnetoelectric combined type miniature wind driven generator comprises a plurality of piezoelectric ceramic pieces 2, a metal substrate 1 and a bluff body 3, the plurality of piezoelectric ceramic pieces 2 are relatively arranged on two surfaces of the metal substrate 1, two wires are fixed between each piezoelectric ceramic piece 2 and the metal substrate 1, the ends of the fixed ends of the wires are connected with the piezoelectric ceramic pieces, and the bluff body 3 is fixed at one end of the metal substrate. .

In a further embodiment, the cuboid comprises a cuboid matrix 3-1 and a through hole 3-2 arranged in the center of the cuboid matrix 3-1, the through hole is perpendicular to the connecting part of the metal substrate 1 and the cuboid matrix 3-1, a magnetic induction coil is spirally wound in the through hole 3-2 along the wall of the through hole, and a magnet is arranged in the through hole. In certain embodiments, the coil is a copper coil.

In a further embodiment, the clamp springs are arranged at two ends of the through hole, so that the magnet is prevented from falling off.

In a further embodiment, a central axis of one end of the blunt body 3 is slotted for tightly connecting with a metal substrate.

In a further embodiment, the magnet length is L/3 and L is the via length.

In a further embodiment, the magnetic flux lines inside the magnet are oriented in the same direction as the coil axis.

The working principle of the invention is as follows:

the bluff body is subjected to periodic force under the action of certain wind speed, the magnetic induction coil vibrates, the axis of the magnetic induction coil is the same as the vibration direction, and the magnet freely moves along the axis of the coil, but the stroke does not exceed the shell of the bluff body. The coil and the magnet penetrating into the coil generate electromagnetic induction to generate current, the piezoelectric ceramic piece generates potential difference through deformation, the current generated by the coil and the magnet is converged to supply power together, and then the current is output from the lead to finish power generation.

The invention is fixed at an outdoor wind position, and when wind blows, the vibration impels the piezoelectric ceramic piece and the magnetic induction coil to respectively generate current so as to generate electricity. A plurality of devices of the invention can be combined for use, and the power supply of small-sized electrical appliances under windy conditions is met.

The piezoelectric ceramic and the magnetic induction coil are used for forming a power generation system to generate power together, so that the power generation efficiency is improved. The piezoelectric ceramic generator is small in size, independently supplies energy and generates power, recovers energy by utilizing piezoelectric ceramic, and converts wind energy into electric energy for utilization. The invention can be used in the power generation part of small-scale devices such as detection, camera shooting and the like, is suitable for being installed in areas with larger wind power such as cities, highway facilities and the like, and has great use value and utilization space. The single wind-driven generator can generate 2-8 mw of electric energy when the wind is breeze (3.4-5.4) m/s.

The invention compounds the piezoelectricity and the magnetoelectricity into a whole in a parallel integration mode, so that the piezoelectric and the magnetoelectricity generate larger power and can meet the requirements of small-sized electrical appliances, and the specific technical route is as follows.

Piezoelectric technology: piezoelectric ceramics used in piezoelectric technology are a class of electronic ceramic materials having piezoelectric properties. The piezoelectric ceramic has the greatest characteristics of piezoelectricity, including positive piezoelectricity and reverse piezoelectricity. The positive piezoelectricity refers to that under the action of mechanical external force, positive and negative charge centers in a medium are relatively displaced to cause polarization, so that bound charges with opposite signs appear in the surfaces of two ends of the medium. In the case of a not too large external force, the charge density is proportional to the external force, following the formula:

＝dT

wherein: -surface charge density;

d-is the piezoelectric strain constant;

t-is the stretching stress.

The invention aims to deform piezoelectric ceramics by stress to generate charge density change, thereby deforming the piezoelectric ceramics by wind power vibration to generate current. The existing device has higher requirements on the vibration frequency of the piezoelectric ceramics, the vibration amplitude and the frequency of the piezoelectric ceramics need to meet the power generation frequency required by a power generation device, and meanwhile, the material needs to have higher strength and is not easy to damage.

Magnetoelectric technology: the magnetoelectric device is used as a part of the power generation device and shares the function of power generation. The system places a magnet and a coil inside the device, and the magnet makes cutting magnetic induction line movement in the coil when vibrating, thereby generating current. The formula:

wherein: e-induced electromotive force;

n-number of turns of induction coil;

Δ Φ/Δ t-rate of change of magnetic flux.