KR20230168430A - Large-scale kinetic energy storage device and large-sacale kinetic energy storage methode using air bearing and linear motor - Google Patents

Abstract

The present invention relates to a large kinetic energy storage device using air bearings and a linear motor, and includes a cart part formed in a closed loop structure and rotating in motion; a linear motor unit located above the cart unit and having a fixed coil provided on a side opposite to the cart unit to rotate the cart unit according to power supplied from the outside; and an air bearing track portion located below the cart portion and including a guide groove that guides the rotation of the cart portion. Through this, the problem of low storage efficiency occurring in existing flywheel energy storage systems can be solved.

Description

Large kinetic energy storage device and large kinetic energy storage method using air bearings and linear motors {LARGE-SCALE KINETIC ENERGY STORAGE DEVICE AND LARGE-SACALE KINETIC ENERGY STORAGE METHODE USING AIR BEARING AND LINEAR MOTOR}

The present invention relates to a large kinetic energy storage device and a large kinetic energy storage method using air bearings and linear motors, and more specifically, to air bearings and linear motors that store and supply a larger amount of energy than existing large-capacity energy storage devices. This relates to a giant kinetic energy storage device and a giant kinetic energy storage method using .

An energy storage system (ESS) is a system that stores surplus energy and provides energy in response to external energy supply requests.

In general, large-capacity energy storage systems require a high level of technology.

These large-capacity energy storage systems generally include battery-based BESS (Battery Energy Storage System).

BESS is an energy storage system that stores electrical energy using a group of lithium-ion batteries.

These BESSs store electrical energy using the fastest responding dispatch power source from the electrical grid.

However, BESS has problems such as poor charging and discharging efficiency, such as deterioration, remaining life, total temperature loss, and inability to recycle waste batteries, and pollution occurs when disposing of batteries.

In addition, BESS has additional problems such as poor fire safety compared to capacity, low load for large-scale power demand situations, and low storage capacity for storing late-night power.

A large-capacity energy storage system that replaces BESS, which has these problems, is the FESS (Flywheel Energy Storage System), which uses a flywheel to convert electrical energy into kinetic energy and store it.

FESS is a reusable energy storage system that stores electrical energy as rotational kinetic energy and converts the rotational kinetic energy into electrical energy when necessary.

This FESS can be miniaturized and modularized, and has advantages such as semi-permanent lifespan, high energy storage density per unit mass, fast response, environmental friendliness, low maintenance costs, rapid charging and discharging, and energy storage efficiency of more than 90%. .

However, FESS has a major problem in converting input electrical energy into rotational kinetic energy of the flywheel and storing it, in that only a small amount of energy of several hundred kilowatt hours is stored.

Therefore, there is a need for research and development on technology to improve the energy capacity stored in FESS, a highly efficient, pollution-free system.

(Republic of Korea) Registered Patent Publication No. 10-1870339

The present invention was created to solve the above problems, and the purpose of the present invention is to provide a large kinetic energy storage device and a large kinetic energy storage method using air bearings and linear motors that store a larger amount of energy than existing FESS. It is provided.

A large kinetic energy storage device using an air bearing and a linear motor according to an embodiment of the present invention to achieve the above object includes a cart part formed in a closed loop structure and rotating in rotation; a linear motor unit located above the cart unit and having a fixed coil provided on a side opposite to the cart unit to rotate the cart unit according to power supplied from the outside; and an air bearing track portion located below the cart portion and including a guide groove that guides the rotation of the cart portion.

At this time, the cart part is made of a heavy material, and includes at least one rotating inertial body on which permanent magnets with different polarities are arranged and attached to the upper surface, and a rail structure for rotating according to the guide groove is formed on the lower surface. can do.

Accordingly, a large kinetic energy storage device using an air bearing and a linear motor generates a magnetic field in the fixed coil when power supplied from the outside is applied to the fixed coil, and the permanent magnet formed at a position opposite to the fixed coil Kinetic energy is generated by rotating according to the magnetic field, and the generated kinetic energy can be stored in the rotating inertial body.

In this regard, the air bearing track portion includes an air storage portion that stores compressed air; A plurality of air holes formed on one side; and a high-pressure line connecting the air storage unit and the air hole, wherein the cart unit can be levitated into the air by spraying compressed air stored in the air storage unit through the high-pressure line and the air hole.

Meanwhile, a large kinetic energy storage method according to an embodiment of the present invention includes the steps of receiving power and compressed air from the outside by performing a large kinetic energy storage device using an air bearing and a linear motor; levitating at least one rotating inertial body into the air using the compressed air; Applying the power to a fixed coil to form a magnetic field in the fixed coil; generating kinetic energy by rotating the at least one rotating inertial body according to the magnetic field; and storing the kinetic energy in the at least one rotating inertial body.

According to one aspect of the present invention described above, the problem of low storage efficiency can be solved by providing a large kinetic energy storage device using air bearings and a linear motor.

Additionally, by providing a large kinetic energy storage device using air bearings and linear motors, energy storage efficiency can be increased by eliminating rolling resistance generated from bearings or wheels.

Figure 1 is a diagram of a large kinetic energy storage device using air bearings and a linear motor according to an embodiment of the present invention.
FIG. 2 is an exploded view of the large kinetic energy storage device using the air bearing and linear motor of FIG. 1.
Figure 3 is a detailed view of the cart portion of Figure 1.
FIG. 4 is a detailed view of the linear motor unit of FIG. 1.
FIG. 5 is a detailed view of the air bearing track portion of FIG. 1.
FIG. 6 is a cross-sectional view of a large kinetic energy storage device using the air bearing and linear motor of FIG. 1.
FIG. 7 is an example diagram of a compressed air storage system using a large kinetic energy storage device using the air bearing and linear motor of FIG. 1.
Figure 8 is a flow diagram of a method for storing large kinetic energy according to an embodiment of the present invention.

Hereinafter, the description of the present invention with reference to the drawings is not limited to specific embodiments, and various changes may be made and various embodiments may be possible. In addition, the content described below should be understood to include all conversions, equivalents, and substitutes included in the spirit and technical scope of the present invention.

In the following description, the terms first, second, etc. are terms used to describe various components, and their meaning is not limited, and is used only for the purpose of distinguishing one component from other components. Like reference numerals used throughout this specification refer to like elements.

As used herein, singular expressions include plural expressions, unless the context clearly dictates otherwise. In addition, terms such as “comprise,” “provide,” or “have” used below are intended to designate the presence of features, numbers, steps, operations, components, parts, or a combination thereof described in the specification. It should be construed and understood as not excluding in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

The present invention relates to a large kinetic energy storage device using air bearings and a linear motor, and stores energy proportional to the weight of the cart by levitating and rotating a cart installed in a closed loop structure, thereby saving more energy than a conventional flywheel energy storage system. We aim to provide a large kinetic energy storage device using air bearings and linear motors that store and supply.

FIG. 1 is a diagram of a large kinetic energy storage device using an air bearing and a linear motor according to an embodiment of the present invention, and FIG. 2 is an exploded view of a large kinetic energy storage device using an air bearing and a linear motor of FIG. 1. FIG. 3 is a detailed drawing of the cart part of FIG. 1, FIG. 4 is a detailed drawing of the linear motor part of FIG. 1, FIG. 5 is a detailed drawing of the air bearing track part of FIG. 1, and FIG. 6 is a detailed drawing of the air bearing and linear motor of FIG. 1. This is a cross-sectional drawing of the giant kinetic energy storage device used.

Referring to Figures 1 and 2, the large kinetic energy storage device 10 using an air bearing and a linear motor according to an embodiment of the present invention includes a cart part 110, a linear motor part 130, and an air bearing track part ( 150).

First, the cart unit 110 is formed in a closed loop structure and rotates as shown in FIG. 3.

At this time, the cart unit 110 may form a closed loop along the circumferential direction of the air bearing track unit 150.

In this regard, the closed loop structure is a structure called a torus structure, and this torus structure is a rotational surface created by rotating a circle in three-dimensional space around a straight line on a plane, and is also referred to as a circular surface.

As such, the cart unit 110 may be made of at least one rotating inertial body 111.

At this time, the cart unit 110 can reduce air resistance during rotation by arranging at least one rotating inertial body 111 in a closed loop structure, thereby reducing air resistance loss of rotational inertia energy.

More specifically, the rotating inertial body 111 may be made of heavy material with a diameter of several kilometers to tens of kilometers depending on the actual use environment.

At this time, the rotating inertial body 111 is preferably formed of a heavy material such as ferromagnetic iron, but can also be formed of a heavy material such as concrete, iron, ore materials, and may be made of heavy materials such as mud, rocks, water, and wood. It is not limited to this as it can be manufactured using any material.

Additionally, a plurality of permanent magnets 1111 having different polarities may be arranged and attached to the upper surface of the rotating inertial body 111 in the transverse direction.

Accordingly, the rotating inertial body 111 can rotate due to the permanent magnets 1111 having different polarities when a magnetic field is formed in the fixed coil 131 provided in the linear motor unit 130.

Additionally, a rail structure 1113 may be formed on the lower surface of the rotating inertial body 111 to rotate according to the guide groove 151 of the air bearing track portion 150.

At this time, the rail structure 1113 is formed in a plurality in a 'V' shape corresponding to the guide groove 151 of the air bearing track portion 150, but is formed in a smaller shape than the guide groove 151 to form the air bearing track portion. It can rotate within (150).

These rail structures 1113 may be formed in a corresponding shape and number according to the guide grooves 151 formed in the air bearing track portion 150.

The cart unit 110 includes at least one such rotating inertial body 111, and arranges each rotating inertial body 111 at a certain distance or more to prevent collisions between the rotating inertial bodies 111 due to rotational inertial energy. It can be prevented.

In addition, the cart unit 110 may form the entire circumferential length of at least one air bearing track unit 150 to be shorter than the circumferential length of the air bearing track unit 150 in order to prevent collision between the rotating inertial bodies 111. there is.

In addition, the cart unit 110 may convert the rotational inertial energy generated as the rotating inertial body 111 rotates into electrical energy and store it in a separate storage device provided inside the rotating inertial body 111.

Here, the electrical energy can be calculated as shown in [Equation 1] below using the total weight of at least one rotating inertial body 111 and the speed variable of the rotating inertial body 111.

Here, E is a variable of electrical energy, m is a variable of the total weight of the rotating inertial body 111, and v is a variable of the speed of the cart.

Meanwhile, the linear motor unit 130 is located on the upper side of the cart unit 110, and a fixed coil 131 is provided on the side opposite to the cart unit 110 to rotate the cart unit 110 according to power supplied from the outside. I order it.

More specifically, the linear motor unit 130 may have a fixed coil 131 provided on the side opposite to the permanent magnet 1111 provided on the upper surface of the cart unit 110, as shown in FIG. 4.

At this time, the linear motor unit 130 may be provided in the form of a block in which different heights are continuously formed in order to fix the fixed coil 131 on the side in a spiral shape.

In addition, although not shown in the drawing, the linear motor unit 130 may have a power line on its upper surface for receiving power from the outside to supply power to the fixed coil 131.

Here, the linear motor unit 130 is described as including only the fixed coil 131 for easy description of the present invention, but may include a permanent magnet 1111 provided in the cart unit 110.

At this time, when the linear motor unit 130 is formed including a fixed coil 131 and a permanent magnet 1111, it may be provided on the other surface of the rotating inertial body 111 to function as a linear motor/generator.

In addition, the linear motor unit 130 may convert power supplied from the outside into a three-phase alternating current voltage in order to provide it to the stationary coil 131.

At this time, the linear motor unit 130 may form a magnetic field in the fixed coil 131 by applying the converted three-phase alternating current voltage to the fixed coil 131.

Through this, even if the linear motor unit 130 is not equipped with a separate motor and generator, the permanent magnets 1111 with different polarities attached to the upper surface of the rotating inertial body 111 form a magnetic field in the fixed coil 131. The rotating inertial body 111 can be rotated by moving .

The air bearing track unit 150 is located below the cart unit 110 and includes a guide groove 151 that guides the rotation of the cart unit 110.

At this time, the air bearing track portion 150 may be formed wider than the lower surface of the cart portion 110 to prevent the cart portion 110 from being separated when the cart portion 110 rotates.

More specifically, as shown in FIG. 5, the air bearing track unit 150 is provided in a closed loop structure so that the cart unit 110 rotates on the upper side, and a plurality of 'V' shaped guide grooves 151 are provided on the upper surface. dogs can be formed.

Here, two guide grooves 151 are formed in a 'V' shape for easy explanation of the present invention, but 'U' depending on the actual use environment of the large kinetic energy storage device 10 using an air bearing and a linear motor. It can be formed in a 'shape' or in a larger number, so it is not limited thereto.

Additionally, the guide groove 151 may be formed to have a larger area than the opposing surface of the rail structure 1113 so that the cart unit 110 can rotate without contact on the upper side.

And, as shown in FIG. 6, the air bearing track unit 150 includes an air storage unit 153, a plurality of air holes 155, and a high pressure line in order to levitate the cart unit 110 located on the upper side into the air. (157) may be further included.

More specifically, the air bearing track unit 150 may further include an air storage unit 153 that stores compressed air supplied from the outside.

Here, the air storage unit 153 is preferably provided as a storage device that stores external compressed air, but compresses it by receiving air and power from the outside, such as a piston-type air compressor, screw-type air compressor, and diaphragm-type air compressor. It can be provided with air compressors that compress with air, so it is not limited to this.

Next, the air bearing track portion 150 may further include a plurality of air holes 155 formed on one side.

At this time, one side of the air bearing track part 150 is the side opposite to the cart part 110, and air holes 155 spaced apart by a certain distance may be formed in this side and the guide groove 151.

In this regard, the air bearing track unit 150 may further include a high pressure line 157 connecting the air storage unit 153 and the plurality of air holes 155.

At this time, one end of the high pressure line 157 may be coupled to the spray hole of the air storage unit 153, and the other end may be coupled to each air hole 155.

Accordingly, the air bearing track unit 150 moves the compressed air of the air storage unit 153 to each air hole 155 through the high pressure line 157, so that the compressed air is sprayed from each air hole 155. You can.

Additionally, the air bearing track unit 150 may further include a plurality of high-pressure pipes 159 for receiving compressed air from the outside.

At this time, the air bearing track portion 150 is further formed with connection holes 158 for coupling the high pressure pipe 159 to the other side, and the number of connection holes 158 is the same as the number of high pressure pipes 159. It is formed so that compressed air can be supplied from the outside.

This air bearing track unit 150 receives compressed air from the outside in the process of receiving residual power from the outside and storing it in the rotating inertial body 111, and uses compressed air and power to move the rotating inertial body 111 into the air. can be supported by

Through this, the air bearing track unit 150 can lift the rotating inertial body 111 into the air, thereby eliminating rolling resistance generated from a flywheel that rotates as a wheel.

Here, rolling resistance is the energy consumed by the load applied to the wheels moving on the road surface. This energy consumption is calculated as the amount of energy consumed by friction between the wheel and the road surface and bending of the tire sidewall when the tire of the wheel rolls on the road.

Therefore, the air bearing track unit 150 lifts the rotating inertial body 111 into the air to eliminate the energy consumption generated by the conventional flywheel rotating on the road surface, thereby reducing the loss of electrical energy stored in the rotating inertial body 111. can be reduced.

As a result, the large kinetic energy storage device 10 using air bearings and a linear motor can store electrical energy supplied from the outside through the above cart unit 110, linear motor unit 130, and air bearing track unit 150. there is.

Accordingly, the large kinetic energy storage device 10 using an air bearing and a linear motor generates a magnetic field in the fixed coil 131 when power supplied from the outside is applied to the fixed coil 131, and generates a magnetic field opposite to the fixed coil 131. The permanent magnet 1111 formed at the position rotates according to the magnetic field to generate kinetic energy, and the generated kinetic energy can be converted into electrical energy and stored in the rotating inertial body 111.

In addition, when the large kinetic energy storage device 10 using air bearings and a linear motor receives a request to supply electric energy from the outside, the permanent magnets 1111 with different polarities are moved to rotate the rotating inertial body 111. , As the magnetic field formed in the fixed coil 131 changes according to the rotation of the rotating inertial body 111, an induced electromotive force is generated in the fixed coil 131, and this induced electromotive force can be discharged to the outside to supply electrical energy to the outside. .

Additionally, the large kinetic energy storage device 10 using air bearings and a linear motor may be applied to a compressed air storage system (S) as shown in FIG. 7.

Figure 7 is an exemplary diagram of a compressed air storage system to which a large kinetic energy storage device 10 using air bearings and a linear motor according to an embodiment of the present invention is applied.

Referring to FIG. 7, a large kinetic energy storage device 10 using air bearings and a linear motor can be buried underground when applied to the compressed air storage system (S).

At this time, the large kinetic energy storage device 10 using air bearings and a linear motor can receive compressed air from a compressed air tank (T) installed on the ground and store it in the air storage unit 153.

In addition, the giant kinetic energy storage device 10 using air bearings and a linear motor can store the residual power generated in the air compression motor M installed on the ground in the rotating inertial body 111 through the above-described process. there is.

In addition, when the large kinetic energy storage device 10 using air bearings and a linear motor receives a request to supply electric energy from the ground, it can supply electric energy by releasing the electric energy to the turbine generator (E) installed on the ground.

At this time, the turbine generator (E) can receive electrical energy emitted according to a preset peak power and provide electricity to connected users.

Through this, the large kinetic energy storage device 10 using air bearings and linear motors is eco-friendly, highly efficient, and capable of semi-permanent operation, and can store and supply more energy than conventional flywheel energy storage systems and compressed air storage systems.

In addition, the large kinetic energy storage device 10 using air bearings and linear motors has the advantage of being able to secure space because it can be buried underground depending on the usage environment.

Meanwhile, Figure 8 is a flow diagram of a method for storing large kinetic energy according to an embodiment of the present invention. The method for storing large kinetic energy according to an embodiment of the present invention uses the air bearing and linear motor shown in Figures 1 to 6. Since it is carried out on the same configuration as the giant kinetic energy storage device 10, the same reference numerals as the giant kinetic energy storage device 10 using air bearings and linear motors in FIGS. 1 to 6 are assigned, and repeated descriptions are omitted. I decided to do it.

Referring to FIG. 8, the large kinetic energy storage method according to an embodiment of the present invention is a method performed from the large kinetic energy storage device 10 using air bearings and a linear motor, and is supplied with power and compressed air from the outside. Step (S10) is performed.

Thereafter, the large kinetic energy storage device 10 using an air bearing and a linear motor levitates at least one rotating inertial body 111 using compressed air (S30) and provides power to the fixed coil 131. The step (S50) of forming a magnetic field in the fixed coil 131 is performed simultaneously.

In addition, the large kinetic energy storage device 10 using an air bearing and a linear motor performs a step (S70) in which kinetic energy is generated by rotating at least one rotating inertial body 111 according to a magnetic field.

In addition, the large kinetic energy storage device 10 using an air bearing and a linear motor can store power supplied from the outside by performing a step (S90) of storing kinetic energy in at least one rotating inertial body 111.

Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art can realize that the present invention can be implemented in other specific forms without changing the technical idea or essential features of the present invention. You will be able to understand it. Therefore, the embodiments described above are illustrative in all respects and are not restrictive.

10: Giant kinetic energy storage device using air bearings and linear motors
110: Cart Department
111: rotating inertial body
1111: Permanent magnet
1113: Rail structure
130: Linear motor unit
131: fixed coil
150: Air bearing track part
151: Guide groove
153: air storage unit
155: air hole
157: high pressure line
158: connection hole
159: high pressure pipe
S: Compressed air storage system with a huge kinetic energy storage device using air bearings and linear motors
T: compressed air tank
M: air compression motor
E: turbine generator

Claims (5)

A cart part formed in a closed loop structure and rotating in rotation;
a linear motor unit located above the cart unit and having a fixed coil provided on a side opposite to the cart unit to rotate the cart unit according to power supplied from the outside; and
An air bearing track unit located below the cart unit and including a guide groove that guides the rotation of the cart unit. A large kinetic energy storage device using an air bearing and a linear motor.
According to paragraph 1,
The cart part,
It is made of a heavy material, and permanent magnets with different polarities are arranged and attached to the upper surface, and at least one rotating inertial body is formed on the lower surface to rotate according to the guide groove. A large kinetic energy storage device using air bearings and linear motors.
According to paragraph 2,
When the power supplied from the outside is applied to the fixed coil, a magnetic field is formed in the fixed coil,
The permanent magnet formed at a position opposite the fixed coil rotates according to the magnetic field to generate kinetic energy,
A large kinetic energy storage device using an air bearing and a linear motor, characterized in that the generated kinetic energy is stored in the rotating inertial body.
According to paragraph 1,
The air bearing track part,
An air storage unit that stores compressed air;
A plurality of air holes formed on one side; and
It further includes a high pressure line connecting the air storage unit and the air hole,
A large kinetic energy storage device using an air bearing and a linear motor, characterized in that the cart unit is levitated in the air by spraying compressed air stored in the air storage unit through the high pressure line and the air hole.
In the giant kinetic energy storage method performed from a giant kinetic energy storage device using air bearings and linear motors,
Receiving power and compressed air from outside;
levitating at least one rotating inertial body into the air using the compressed air;
Applying the power to a fixed coil to form a magnetic field in the fixed coil;
generating kinetic energy by rotating the at least one rotating inertial body according to the magnetic field; and
A giant kinetic energy storage method comprising: storing the kinetic energy in the at least one rotating inertial body.