CN214755741U

CN214755741U - Discrete electricity storage system

Info

Publication number: CN214755741U
Application number: CN202121308533.8U
Authority: CN
Inventors: 刘玉亭
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-11
Filing date: 2021-06-11
Publication date: 2021-11-16
Anticipated expiration: 2031-06-11

Abstract

The utility model provides a discrete electricity storage system, which comprises a control device, an electromechanical DC-AC device and at least two electricity storage devices; the control device comprises a switch shunt circuit and a control module, wherein the control end of the switch shunt circuit is connected with the control module; a shunting control program is arranged in the control module; the electromechanical DC-AC device comprises an electric wheel device, a magnetic driving wheel and a rotary generator; the electric wheel device comprises a rotary motor and an electric wheel fixedly connected with a rotor of the rotary motor; the power output end of the rotary generator is electrically connected with one of the power storage devices through the rectifying device; the control device is respectively and electrically connected with the power supply control end of the motor, an external power supply and other power storage devices. The utility model discloses can realize that external power source charges to two at least power storage device's optimization, electric energy conversion efficiency is high.

Description

Discrete electricity storage system

Technical Field

The utility model relates to an energy storage design field, concretely relates to discrete's accumulate system.

Background

The main current of the electricity storage technology is to use a secondary battery, and the specific application is to store an external power supply in an electricity storage device; the traditional concept of the power storage device is that batteries are connected in series and in parallel and piled, and the default of the separation of the similar batteries has no practical significance.

The batteries are separated into different independent power storage devices to realize the gradient utilization of the secondary batteries, but the technical problem of the stacking application of the batteries is long; the consistency of batteries with different utilization sources of echelons is obviously poor, and a complex management system is needed; on the other hand, in order to ensure safe operation, the electricity storage system usually hopes that the battery used in the echelon and the new battery are adopted in parallel in practical design, but the performances of the new battery and the battery used in the echelon cannot be consistent. The utility model discloses to the technical problem in this type of new market, the design viewpoint is at first with echelon utilization battery and the different accumulate device of new battery discrete, and the source that utilizes the battery when the echelon is different, can also further separate out more independent accumulate devices.

The utility model discloses focus on reducing charging, the electromagnetic radiation of discharge high frequency switch circuit simultaneously, utilize an electromechanical DC-AC device; it is generally considered that the loss is large due to the multistage energy conversion, and the research in the industry is advanced with the recent publication of the magnetic force integrated transmission technology, and the present application is proposed based on this technical background.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a, lie in to the not good enough defect of battery monomer uniformity, two at least separate conventional accumulate device, when improving the inside battery combination uniformity of discrete accumulate device, charge and an inverter application electromechanical DC-AC device, technical scheme realizes easily that the practicality is strong.

In order to achieve the above technical object, the present invention provides a discrete electricity storage system, which includes a control device, an electromechanical DC-AC device, and at least two electricity storage devices; the control device comprises a switch shunt circuit and a control module, wherein the control end of the switch shunt circuit is connected with the control module; a shunting control program is arranged in the control module; the electromechanical DC-AC device comprises an electric wheel device, a magnetic driving wheel and a rotary generator; the electric wheel device comprises a rotary motor and an electric wheel fixedly connected with a rotor of the rotary motor; the power output end of the rotary generator is electrically connected with one of the power storage devices through the rectifying device; the control device is respectively and electrically connected with the power supply control end of the motor, an external power supply and other power storage devices.

The power storage device is formed by electrically connecting secondary batteries in series and in parallel and comprises a management system device; secondary batteries include, but are not limited to, lead-acid batteries, lithium batteries, nickel-metal hydride batteries, zinc-nickel batteries; the external power supply comprises an alternating current power supply provided by a city network or a fuel generator or a wind driven generator, or a direct current power supply provided by a primary battery or a photovoltaic device; the primary battery includes but is not limited to an aluminum air battery and a zinc air battery.

In the technical scheme, the outer edges of the electric wheels and the magnetic driving wheels are respectively provided with a plurality of permanent magnets which are evenly distributed at intervals; the electric wheels and the magnetic driving wheels are adjacently arranged in the same plane or in a way of being embedded with different planes; the magnetic driving wheel is fixedly connected with the rotating generator coaxially or in a transmission way through a magnetic suspension device and a speed change device.

In the above technical solution, at least one of the electric wheel, the magnetic wheel, and the rotary generator is provided in the electromechanical DC-AC device. The plurality of electric wheels are arranged to facilitate starting and controlling of the magnetic driving wheels, the plurality of magnetic driving wheels facilitate enhancing of rotation inertia and multipath torque output, and the plurality of rotary generators can achieve multipath output of electric energy.

In the technical scheme, the base body of the magnetic driving wheel is formed by combining more than 2 different material components. The magnetic driving wheel base body combined by a plurality of different material components can bring more optimized designs.

In the above technical solution, the rotating motor is a numerical control switch type rotating motor. The rotary motor adopts a numerical control switch mode, so that electric energy can be saved, and intelligent control can be realized more conveniently.

In the above technical solution, the electric wheel and the rotating motor are integrally designed.

In the above technical solution, the power supply device comprises an ac power output interface electrically connected to a power output terminal of the generator.

The mechanical support frame part required by the implementation and application of the electricity storage system can be made of any material and structure on the premise of effectively realizing mechanical support.

The utility model is characterized in that the electricity storage devices of the electricity storage system are separated into more than two devices; as known to those skilled in the art, the battery products have a plurality of influence factors in the production link, and even if the performances of the batteries in the same batch are different, the batteries are connected in series and in parallel to form a high-voltage and huge-capacity electricity storage device, so that a plurality of defects caused by product inconsistency are inevitably enlarged; therefore, even if the same type of new battery stack power storage device is used, the working reliability can be improved by separating more than two batteries. If the batteries are used in combination with new batteries in an echelon way, the consistency of the charging and discharging performances of the batteries is poorer, and more than two separated power storage devices can effectively reduce the inconsistency of products from different sources.

The electromechanical DC-AC device plays a role of a charge-discharge system, wherein the magnetic driving wheel does not generate mechanical energy transmission with the electric wheel, but changes the distribution state of a two-wheel gap magnetic field to be torque, and drives a generator to rotate to generate electricity, and the alternating current can be used for charging the electricity storage device through a rectifying device and can also be reversely changed to be an alternating current power supply provided outside the electricity storage system; the rotating motor is preferably in a numerical control switch type, the power supply is discontinuous, the surplus electric energy of the power supply can be used for charging other energy storage devices, and particularly when the external power supply is the power supply provided by a wind energy generator, a photovoltaic generator or a fuel generator, the real-time storage of the surplus electric energy is very important.

The utility model has the advantages that: the two or more electricity storage devices can improve the stability of the series and parallel combined work, and are particularly suitable for solving the problem of the simultaneous use of a new battery and a gradient utilization battery; the electromechanical DC-AC device has torque increment brought by permanent magnetic energy transmission, diversified combination and high electric energy conversion efficiency.

Drawings

Fig. 1 is a schematic diagram of a logic structure of the charging of the electric storage system;

FIG. 2 is a schematic diagram of a control function logic and external structure of the control device;

FIG. 3 is a schematic view of an electric wheel with 4 permanent magnets at the outer edge;

FIG. 4 is a schematic view of a magnetic driving wheel with 8 permanent magnets at the outer edge;

FIG. 5 is a schematic view of a magnetic power wheel constructed from two different materials;

FIG. 6 is a schematic view of a partial structure of the electric wheel and the magnetic driving wheel disposed adjacent to each other in the same plane;

FIG. 7 is a schematic view of a partial structure of the electric wheel and the magnetic wheel which are adjacent and embedded in different planes;

FIG. 8 is a schematic view of a partial structure of a magnetic actuator wheel coaxially and fixedly connected to a generator;

fig. 9 is a schematic diagram of a logic structure of the discharging of the power storage system.

The attached drawings are as follows:

1. electric wheel 1a, electric wheel rotating shaft 2, magnetic wheel 2a and magnetic wheel rotating shaft

3. Generator 3a, generator shaft 4, permanent magnet 5, gap

10. Plane line 11, normal line 12, tangent line 13, magnetic force line

21. ABS material 22, nonmagnetic alloy

Detailed Description

The present invention will be further described in detail with reference to the drawings and examples.

Fig. 1 is an example of a charging logic structure of the power storage system, which is characterized in that the power storage devices are separated into two power storage devices, and the charging system is an electromechanical DC-AC device, and the way of converting electric energy is as follows: the external power supply is divided into two paths under the control of the control device, one path drives a motor of the electromechanical DC-AC device, a generator of the electromechanical DC-AC device obtains alternating current, and the alternating current is used for charging the electricity storage device A through the rectifying device; and the other branch power supply charges the power storage device B under the control of the control device. The illustrated electric storage devices a and B can be understood as one of them being a new secondary battery series/parallel device, and the other being a secondary battery series/parallel device that is used in a stepwise manner.

The electromechanical DC-AC device belongs to the combined design of conventional machinery and electromechanical products, has good device stability, no high-frequency electromagnetic radiation, is suitable for the requirement of high-power application, and has obvious technical and practical advantages.

The control device of the example in fig. 1 includes a switch shunt circuit and a control module, wherein a control end of the switch shunt circuit is connected with the control module; the control module is internally provided with a shunt control program, so that when the motor of the electromechanical DC-AC device supplies power with surplus energy, the surplus energy is used for charging the power storage device B, and the control function logic and the external structure of the control module are shown in figure 2. When the external power supply is not matched with the working voltage of the motor and the charging voltage of the power storage device, the control device is correspondingly provided with a voltage adjusting and current limiting circuit, and the power supply for the motor and the charging of the power storage device B are realized through switch shunt control; in the specific design, the voltage range of the external power supply is suitable to be matched with the working voltage of the motor and the charged voltage of the electricity storage device, so that the functional design of the control device is relatively simple, and the utilization rate of the external power supply is improved.

The rectifying device has the function of converting alternating current generated by the generator into direct current, and can adopt any rectifying circuit; the working principle of the rotating generator is established in a rotating magnetic field, the internal coil winding obtains alternating current, and if a rectifying device is added to the configured generator, the generator and the rectifying device are integrally designed; the rectifying device is a mature product, and the general functions comprise rectifying, filtering, voltage limiting/current limiting or intelligent control.

Fig. 3 is a schematic structural view of an electric wheel 1 with 4 permanent magnets arranged on the outer edge, and the direction of the line connecting the two poles N, S of the permanent magnet 4 is the direction of the rotation tangent line 12; the magnetic pole connecting line is the magnetic pole directivity description of the permanent magnet 4 arranged on the outer edge of the wheel, and the actual design can deflect a certain angle.

Fig. 4 is a structural schematic diagram of a magnetic power wheel 2 in which 8 permanent magnets are embedded and arranged inside the outer edge, the direction of the connecting line of the N, S two magnetic poles of the 8 permanent magnets 4 is the direction of a normal line 11, and the S poles of the 8 permanent magnets face the rotating shaft 1 a; the normal line 11 is the direction of any line connecting the rotating shaft on the plane of the wheel.

The permanent magnet arranged on the outer edge of the electric wheel and the permanent magnet arranged on the outer edge of the magnetic wheel are made of magnetic steel, neodymium iron boron and other materials well known to those skilled in the art; the permanent magnets are arranged on the outer edge of the electric wheel and the outer edge of the magnetic wheel, are arranged in the same direction according to respective axes, and are not limited in shape on the premise of not influencing installation.

The design requirement of the magnetic driving wheel 2 has certain mass, so that certain inertia can be compounded during rotation, the magnetic driving wheel is suitable for being manufactured by materials with larger specific gravity, and the matrix structure of the magnetic driving wheel comprises a plurality of circular rings which are fixedly connected into a whole with the same axis center through fasteners and integrated design and manufacturing. Fig. 5 is an example of a disk-shaped magnetic driving wheel formed by combining two different material components, wherein the material of the ring 21 is ABS, the material of the ring 22 is nonmagnetic alloy, and the connection line of the N, S magnetic poles of the permanent magnet 4 is the direction of the rotating shaft 2a, i.e. the N pole of the permanent magnet 4 faces one side of the rotating shaft, and the S pole faces the other side of the rotating shaft.

The electric wheel 1 and the magnetic wheel 2 are arranged adjacently, and the electric wheel and the magnetic wheel are arranged adjacently in a way of embedding the same plane or different planes; fig. 6 is a structural example in which the electric wheel and the magnetic wheel are arranged adjacent to each other on the same plane line 10, and the directions of the connection lines of the two poles N, S of the permanent magnet 4 arranged on the outer edge of the electric wheel 1 and the outer edge of the magnetic wheel 2 are both arranged along the normal line 11; the relative magnetic polarities of the two wheels of permanent magnets 4 are the same, and a gap 5 is arranged between the two wheels; the gap is a channel for magnetic interaction, and the smaller the gap is, the more beneficial the magnetic energy between the permanent magnets is to transmit, for example, the small power generation device is generally arranged to be 1-2mm, and the medium power generation device is generally arranged to be 2-10 mm.

FIG. 7 is another exemplary structure of the electric wheel and the magnetic wheel which are adjacently arranged on different plane lines 10, wherein the adjacent arrangement is that the projection is embedded; the connecting line directions of two N, S magnetic poles of the permanent magnet 4 arranged on the outer edge of the electric wheel 1 and the outer edge of the magnetic wheel 2 are both arranged along the rotating shaft; the electric wheel is opposite to the permanent magnet 4 at the outer edge of the magnetic wheel and has opposite magnetic polarity, and the gap 5 between the two wheels is positioned between the plane lines 10 of the two wheels.

In order to make the magnetic driving wheel rotate under the magnetic force driving of the electric wheel, the permanent magnets of two wheels are required to be designed to periodically face each other in the accompanying rotation; the periodically opposing structure is understood to mean that the arc pitch of the outer edges of the permanent magnets 4 provided in the magnetic power wheel 2 is equal to the arc pitch of the outer edges of the permanent magnets 4 provided in the electric power wheel 1.

When the electric wheel 1 rotates, the distribution of a gap magnetic field between the electric wheel 1 and the magnetic driving wheel 2 is changed along with the rotation of the magnetic driving wheel, so that the gap magnetic field is converted into torque of the magnetic driving wheel; the torque of the magnetic driving wheel not only comprises the torque converted by the transmission of the magnetic energy of the electric wheel, but also is added with the self rotational inertia, and when the magnetic driving wheel has certain mass and enough rotating speed, the self rotational inertia can not be ignored, so that the rotary generator obtains higher electric energy conversion efficiency.

The transmission of the magnetic driving wheel and the generator can be coaxially fixedly connected, and fig. 8 is an example of coaxial fixedly connecting of the magnetic driving wheel 2 and the generator 3; the magnetic driving wheel and the generator can also be fixedly connected through a magnetic suspension device and a speed change device in a transmission way, and the magnetic suspension device and the speed change device are mature technologies and are familiar to persons skilled in the art. The output power of the generator 3 can be controlled by controlling the rotation speed of the electric wheel 1 by the control device.

The electric wheel 1 is driven by a rotary motor, and the selection type of the motor is related to the current property of an external power supply and the electric energy conversion efficiency; the alternating current motor is selected when the external power supply is alternating current, and the direct current motor is selected when the external power supply is direct current. With the development of a digital switch control technology, a numerical control switch type motor is developed in the market in recent years, wherein numerical control, namely a power supply mode is digital sequential current, the power supply mode is discontinuous, the digital intelligent control is called in the industry, the electric energy conversion efficiency is high, the rated torque is large, the switching frequency can be automatically adjusted according to the set rotating speed, and the numerical control switch type motor is usually used for a rotary wing type unmanned aerial vehicle; the numerical control switch type motor is a technical preference, and is suitable for being matched with an external direct current power supply, and can also be matched with an external alternating current power supply through a rectifying and controlling device.

An example of the integrated design of the electric wheel 1 and the motor is that an outer rotor motor is adopted to transform an outer rotor into the electric wheel 1, and a plurality of permanent magnets 4 are evenly distributed on the outer rotor at intervals.

When the magnetic energy transmission function between the permanent magnets needs to be increased, the permanent magnets arranged at the outer edges of the electric wheels and the magnetic driving wheels can be selected to be increased, and the number of the permanent magnets is limited by the effective magnetic force action interval of the electric wheels and the magnetic driving wheels.

The optimal design of the electric wheels, the magnetic wheels provided with permanent magnets and the gap 5 is based at least on the following considerations: the magnetic action of the magnetic driving wheel is an interaction relation jointly determined by multiple factors such as the rotating speed of the electric wheel, the number of the permanent magnets periodically opposite to each other of the two wheels, the gap 5 between the permanent magnets and the like; fig. 8 shows a schematic diagram of a magnetic force line 13 of the electric wheel and the magnetic wheel in the relative operation process, which can be decomposed into a normal 11 direction and a rotation tangent 12 direction, wherein the normal force component does not contribute to the torque, and the principle of the optimized design is to make the magnetic force tangential force component of the magnetic wheel as large as possible.

The utility model can be provided with a plurality of sets of electromechanical DC-AC devices; a plurality of electric wheels and magnetic driving wheels can be arranged in the same electromechanical DC-AC device; the same magnetic driving wheel can also be matched with a plurality of generators.

Applications of electrical storage systems include electrical discharge, for example, to power the grid by inverting the dc power of an electrical storage device to ac power; an electromechanical DC-AC device is an inverter device, and an example of a discharge operation logic structure thereof is shown in fig. 9.

The following preferred examples are merely recommended, and several of the solutions can be used in part, or in combination and with other well-established techniques.

Examples 1,

Designing a discrete type power storage system, which comprises a control device, an electromechanical DC-AC device and two power storage devices; the electricity storage device A is a lithium battery pack which is utilized in a gradient manner, and the electricity storage device B is a new lithium battery pack.

In the electromechanical DC-AC device, the matrix of the magnetic driving wheel 2 is composed of two different material components, the structure is schematically shown in FIG. 5, the material of the inner ring 21 is ABS, and the material of the outer ring 22 is nonmagnetic alloy; setting the radius of the inner ring 21 to be 1.0m and the thickness to be 160 mm; the radius of the outer ring 22 is 1.2m, the thickness is 160mm, 32 box-shaped permanent magnets 4 which are evenly arranged at intervals are embedded in the outer edge, and the connecting line of two magnetic poles of the permanent magnet N, S is arranged along the direction of the rotating shaft 2 a; the electric wheel 1 is formed by reforming an outer rotor of a numerical control switch type direct current motor, the outer edge of the outer rotor is fixedly connected with 8 permanent magnets 4 which are evenly distributed at intervals, and the connecting lines of two magnetic poles of the permanent magnets N, S are distributed along the direction of a rotating shaft 1 a; the outer edge arc distance of the 32 permanent magnets arranged on the magnetic driving wheel is equal to the outer edge arc distance of the 8 permanent magnets arranged on the electric wheel.

When the device is installed, the electric wheel 1 and the magnetic wheel 2 are adjacently arranged in a way that different plane lines 10 are embedded, the local structure is shown in figure 7, the magnetic poles of the permanent magnets 4 arranged at the outer edges of the two wheels have opposite polarities, and the gap 5 is 2.8 mm; the magnetic driving wheel is coaxially and fixedly connected with the rotary generator 3; the rated power of the rotary generator is 18KW, and the power output end is electrically connected with the electricity storage device A through the rectifying device; the control device is respectively and electrically connected with an external power supply, the power storage device B and the numerical control switch type direct current motor, and the structure of a working logic circuit is schematically shown in figure 1; the control device is a double-way switch control device and comprises a switch shunt circuit and a control module, wherein the control end of the switch shunt circuit is connected with the control module; the control module is internally provided with a shunt control program, and the control function logic and the external structure of the shunt control program are shown in figure 2.

In the embodiment, an external power supply for supplying electric energy to the electric storage system is a primary aluminum air battery pack, and the discharge voltage range is matched with the working voltage of a motor and the charged voltage range of an electric storage device; under the control of the control device, the power supply of the primary aluminum-air battery is divided into two paths: one path of direct current motor drives the electromechanical DC-AC device to rotate the electric wheel 1, the magnetic driving wheel 2 generates magnetic attraction component force along the tangential line 12 direction through the distribution change of magnetic field in the gap between the magnetic driving wheel and the electric wheel 1, torque is obtained to drive the generator 3 to rotate for power generation, and the rectifier device is used for charging the power storage device A. The design purpose of controlling the output power of the rotary generator 3 can be achieved by controlling the rotating speed of the electric wheel 1.

The control device supplies power to the numerical control switch type direct current motor discontinuously, so that residual electric energy exists in the other shunt circuit of the control device, and the residual electric energy charges the electricity storage device B under the control of the control device.

The embodiment can reduce the inconsistent defects of the same group of serial and parallel connection of the echelon utilization battery and the new battery, and the electromechanical DC-AC device and the control device are not provided with a high-frequency switch circuit, have no high-frequency electromagnetic radiation and have stable and reliable work.

When the batteries utilized in the echelon are from a plurality of sources and the capacity of the power storage device is large enough, the power storage device C, the power storage device D and the like can be continuously separated according to the types and the sources of the batteries; the control device is correspondingly provided with n paths of shunt control circuits according to the discrete number n of the power storage device, and the split electromechanical DC-AC device circuit belongs to the selection.

Examples 2,

On the basis of the technical scheme of the embodiment 1, the electricity storage device B is replaced by a zinc-nickel battery pack; in addition, when the electric wheel 1 and the magnetic wheel 2 are adjacently arranged in a way of embedding different planes, the magnetic poles of the permanent magnets 4 arranged on the outer edges of the two wheels are opposite in the same polarity, and the rest structures are unchanged. When the control device drives the electric wheel to rotate, the magnetic driving wheel generates magnetic repulsion component force along the tangential line 12 direction through the change of a gap magnetic field between the magnetic driving wheel and the electric wheel, the generator 3 is driven to rotate to generate power, and the power storage device A is charged through the rectifying device; the other shunt circuit of the control device charges the electricity storage device B.

In the power storage system of the present embodiment and the foregoing embodiments, the external power supply of the primary aluminum air battery may be replaced by a photovoltaic power supply, and when the power supply voltage range of the photovoltaic power supply does not match the operating voltage of the dc motor and the charged voltage of the power storage device, a voltage adjusting device may be optionally added to the control device.

Examples 3,

The technical scheme that the direct-current motor of the electromechanical DC-AC device in the embodiment 1 is replaced by an alternating-current motor, and an outer rotor of the motor is transformed into the electric wheel 1 is unchanged; an external power supply for providing electric energy for the electricity storage system is changed into an alternating current power supply provided by the wind driven generator; the control device correspondingly adjusts a control circuit of external power supply shunt, wherein one path for supplying power to an alternating current motor in the electromechanical DC-AC device is alternating current, and the other path for supplying surplus electric energy to the power storage device for charging is alternating current; other components and circuit connection and mounting structures are similar to those of embodiment 1.

The embodiment can realize the storage of external wind power in the power storage device A and the power storage device B with high conversion efficiency.

Examples 4,

An alternating current power supply output interface is added on the basis of the embodiment 1 and is connected with a power supply output end of the generator 3; the control device is respectively electrically connected with the electricity storage device A and the electricity storage device B, and a control program stored in a control module in the control device is added with a logic setting function: when the power storage system is discharged, the discharge circuit of the power storage device a is turned on preferentially, and when the capacity of the power storage device a decreases to 50%, the discharge circuit of the power storage device B is automatically changed to be turned on.

The discharge logic structure of this embodiment is schematically shown in fig. 3, an ac power converted by the aluminum-air battery can be obtained at the ac power output interface, and the discharge control program built in the control module in the control device can be set according to the discharge control function required by the external load.

Claims

1. A discrete electrical storage system comprising a control means, an electromechanical DC-AC device and at least two electrical storage means; the control device comprises a switch shunt circuit and a control module, wherein the control end of the switch shunt circuit is connected with the control module; a shunting control program is arranged in the control module; the electromechanical DC-AC device comprises an electric wheel device, a magnetic driving wheel (2) and a rotary generator (3); the electric wheel device comprises a rotary motor and an electric wheel (1) fixedly connected with a rotor of the rotary motor; the power output end of the rotary generator (3) is electrically connected with one of the power storage devices through a rectifying device; the control device is respectively and electrically connected with the power supply control end of the motor, an external power supply and other power storage devices.

2. The electric storage system according to claim 1, characterized in that the outer edges of the electric wheel (1) and the magnetic wheel (2) are respectively provided with a plurality of permanent magnets (4) which are evenly arranged at intervals; the electric wheel (1) and the magnetic wheel (2) are adjacently arranged in the same plane or in a way of being embedded with different planes; the magnetic driving wheel (2) is fixedly connected with the rotary generator (3) coaxially or in a transmission way through a magnetic suspension device and a speed change device.

3. An electric storage system according to claim 1, characterized in that at least one of said electric wheels (1), magnetic wheels (2), and rotary electric generator (3) is provided in said electromechanical DC-AC device.

4. An electric storage system as claimed in claim 1, characterized in that the basic body of the magnetic traction wheel (2) is composed of more than 2 different material components.

5. An electricity storage system as claimed in claim 1, wherein said rotary motor is a digitally controlled switched rotary motor.

6. An electric storage system as claimed in claim 1, characterized in that the electric wheels (1) and the rotary electric motor are of an integrated design.

7. An electricity storage system according to claim 1, characterized by comprising an alternating current power supply output interface electrically connected to a power supply output of the generator (3).