JP2001173652A - Energy storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for reducing the loss in a bearing used for a temporary or long-term energy storage device so as to solve a problem such that a bearing loss becomes larger as the number of revolution increases. SOLUTION: This device consists of two pairs of ring-shaped permanent magnets opposite to each other, a rotary shaft, and two pairs of roller bearings. A specified ratio of a thrust load applied to the roller bearings is reduced by a repulsive force between the two pairs of ring-shaped permanent magnets, thereby reducing a loss caused in the roller bearings and making a stable operation possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an energy storage device, for example, which converts nighttime surplus power into kinetic energy and stores it, and converts this kinetic energy into electric energy during the daytime to take out the energy.

[0002]

2. Description of the Related Art A rotating body (flywheel) having a large moment is fixed to a rotating shaft as a device which can be installed in a small business or ordinary household to store surplus power at night, and a conduction generator is mounted on the rotating shaft. An energy storage device incorporating a is studied. For this energy device,
By supplying surplus electric power to the conductive generator at night, the rotating shaft and the rotating body are rotated, the surplus electric power is converted into kinetic energy, and stored as rotational kinetic energy of the rotating body. In the daytime, the electric power is generated by the above-described conductive generator based on the rotational kinetic energy, and the electric power is taken out and used. The rotational energy E of the rotating body is
E = (1/2) × Iω ^ 2 here,
I is the moment of inertia of the flywheel, and ω is the angular velocity (rad / s) of the rotating body. Therefore, in order to increase the stored rotational energy E, it is effective to increase the number of rotations of the rotating body. However, there is an upper limit to the number of rotations due to the limitation of the material strength of the rotating body used. It is considered that the peripheral speed of the rotating body made of carbon fiber reinforced plastic is about 800 m / sec.

[0003] Since rotational energy stored in a rotating body is attenuated with time due to windage loss and bearing loss, it is necessary to store the rotating body in an airtight container decompressed by a vacuum pump and use a bearing having a small bearing loss. desirable. In the prior art, in order to reduce bearing loss, Japanese Unexamined Patent Publication No.
As described in Japanese Patent Application Publication No. 7, JP-A No. 7-107, an electric power storage device using a superconducting magnetic bearing device as a bearing device has been proposed. As described in Japanese Patent Application Laid-Open No. 9-21420, an active magnetic bearing device has also been proposed as a bearing device.

[0004]

When the weight of the rotating body is increased in order to improve the power storage capacity of the energy storage device constructed and operated as described above, the load capacity of the superconducting magnetic bearing device is increased. There is a need to. However, the load capacity of the superconducting magnetic bearing that can be used at present is limited, and the performance of the energy storage device is improved by using a rotating body that can be supported only by the superconducting magnetic bearing,
Or, it has been difficult to support a rotating shaft to which a large thrust load is applied.

In order to compensate for such a shortage of the load capacity of the superconducting magnetic bearing, it is conceivable to additionally install a passive magnetic bearing between the rotating body and the housing. However, the bearing operation of the passive magnetic bearing is generally unstable in many cases.

In addition, the active magnetic bearing device does not have the above problems, but instead has a complicated control system, requires an exciting current for floating the rotating body, and loses control when a trouble such as a power failure occurs. Had issues.

[0007]

According to a first aspect of the present invention, there is provided a rotary body, a storage container for storing the rotary body, and a storage container for storing the rotary body. First and second bearings that contact and support radially and axially to maintain a predetermined operating position; and permanent magnets arranged in an annular shape with magnetic poles aligned in the axial direction above the rotating body. An energy storage device including a passive magnetic bearing for applying a force. The magnetic bearing bears a predetermined ratio of the weight of the rotating body, and acts to reduce bearing loss during high-speed rotation.

According to a second aspect of the present invention, there is provided a rotating body, a storage container for storing the rotating body, and a method in which the rotating body is supported in contact with the storage container in a radial direction and an axial direction. Energy provided with first and second bearings held in an operation position, and passive magnetic bearings in which a permanent magnet arranged in an annular shape with magnetic poles aligned in the axial direction below the rotating body applies an upward force. It is a storage device. The magnetic bearing bears a predetermined ratio of the weight of the rotating body, and acts to reduce bearing loss during high-speed rotation.

According to a third aspect of the present invention, there is provided a rotating body, a storage container for storing the rotating body, and a method of supporting the rotating body in contact with the storage container in a radial direction and an axial direction. First and second bearings which are held in an operating position, and a passive force in which an upward force is applied by permanent magnets arranged in an annular and conical shape with their magnetic poles aligned axially below a shaft passing through the center of the rotating body. And an energy storage device having a magnetic bearing. The magnetic bearing bears a predetermined ratio of the weight of the rotating body, and acts to reduce bearing loss during high-speed rotation.

According to a fourth aspect of the present invention, there is provided a rotating body, a storage container for storing the rotating body, and a method of supporting the rotating body in contact with the storage container in a radial direction and an axial direction. First and second bearings that are held in an operating position, and a passive type in which magnetic poles are aligned in the axial direction with a part of a shaft passing through the center of the rotating body, and an upward force is applied by permanent magnets that are annularly embedded and disposed. An energy storage device including a magnetic bearing. The magnetic bearing bears a predetermined ratio of the weight of the rotating body, and acts to reduce bearing loss during high-speed rotation.

According to a fifth aspect of the present invention, there is provided a rotating body, a storage container for storing the rotating body, and a method for supporting the rotating body in contact with the storage container in a radial direction and an axial direction. First and second bearings that are held in an operating position, and a passive type in which magnetic poles are axially aligned with a part of a shaft passing through the center of the rotating body and an upward force is applied by a ring-magnetized permanent magnet. An energy storage device including a magnetic bearing. The magnetic bearing bears a predetermined ratio of the weight of the rotating body, and acts to reduce bearing loss during high-speed rotation.

According to a sixth aspect of the present invention, there is provided a rotating body, a storage container for storing the rotating body, and a method for supporting the rotating body in contact with the storage container in a radial direction and an axial direction. First and second bearings that are held in an operating position, and passive magnetic bearings in which magnetic poles are aligned in the axial direction on the lower surface of the rotating body and an upward force is applied by permanent magnets that are annularly embedded and disposed. An energy storage device.
The magnetic bearing bears a predetermined ratio of the weight of the rotating body, and acts to reduce bearing loss during high-speed rotation.

According to a seventh aspect of the present invention, there is provided a rotator made of a ferromagnetic material, a storage container for storing the rotator, and contacting the rotator radially and axially with the storage container. First and second supporting and holding in a predetermined operating position
And a passive magnetic bearing on the lower surface of the rotating body, in which magnetic poles are aligned in the axial direction and an upward force is applied by a ring-magnetized permanent magnet. The magnetic bearing bears a predetermined ratio of the weight of the rotating body, and acts to reduce bearing loss during high-speed rotation.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In each embodiment, the same reference numerals are given to components having the same configuration and the same operation, and a part of the description will be omitted.

(Embodiment 1) FIG. 1 is a sectional view of a main part of an apparatus according to Embodiment 1 of the present invention.

In FIG. 1, 1 is a rotating body, 2 is its rotating shaft, 3 is a storage container, 4 is a first rolling bearing that supports the rotating body 1 in radial contact with the storage container 3, and 5 is a diameter. A second rolling bearing 6 which is supported in contact in the axial direction and in the axial direction, and a first rolling bearing 6 is fixed to the upper part of the rotating body 2 in a ring shape with magnetic poles aligned in the axial direction.
, A ring-shaped second permanent magnet in which the magnetic poles are opposed to the first permanent magnet 6 in the axial direction, 8 is a rotor of the motor generator, and 9 is a pair of magnetic cores 9a and n. Winding group 9
b, the stator 10 of the motor generator,
An inverter 11 supplies a rotating magnetic field to the housing 11, a support member made of a non-magnetic material for attaching the stator 9 and the second permanent magnet 7 to the storage container 3, and 12 a timer for controlling the inverter 10 having a timing function.

Next, the operation and function will be described. At night (for example, from 22:00 to 6 o'clock), the timer 12 operates to supply the surplus power to the inverter 10 so that the n-phase is transferred from the inverter 10 to the winding group 9. An electric current is supplied to generate a rotating magnetic field, and the rotating body 1 is rotated by the rotating magnetic field.
Since the rotating body 1 is fixed to the rotating body 1, the rotating body 1 rotates at a predetermined rotation speed, and the supplied power is converted into rotational kinetic energy of the rotating body 1 and stored.

On the other hand, in the daytime, the electric power is generated by the above-mentioned conductive generator based on the rotational kinetic energy, and regenerative electric power is taken out from the inverter 10 and used.

If the stored energy is set to 20 Wh, the rotating body 1 has a radius of 0.2 m, a thickness of 0.06 m,
The weight is 60 kg and the number of revolutions is 3500 rpm. here,
The first permanent magnet 6 and the second permanent magnet 7 are subjected to an upward force due to the same repulsive force to bear a predetermined proportion of the weight of the rotating body 1 (reducing the thrust load) and to provide a bearing during high-speed rotation. Acts to reduce loss.

In this embodiment, as shown in FIG.
The first permanent magnet 6 and the second permanent magnet 7 have different diameters (the second permanent magnet is larger in this example), and the first permanent magnet 6 has a second permanent magnet 7. A centripetal force toward the axis always acts as a component of the same repulsive force, and the rotor 1 can be stably levitated by the gyro effect. In this case, the flying height is, for example, the diameter of the first permanent magnet 6 is φ10 mm, its own weight is 10 g, the diameter of the second permanent magnet 7 is φ70, and the surface magnetic flux density of each permanent magnet is 800.
Under the condition of G, it is about 10 mm.

(Embodiment 2) FIG. 2 is a sectional view of a main part of Embodiment 2 of the present invention.

In FIG. 2, 1 is a rotating body, 2 is its rotating shaft, 3 is a storage container, 4 is a first rolling bearing that supports the rotating body 1 in radial contact with the storage container 3, and 5 is a diameter. A second rolling bearing 15 which is contact-supported in the direction and the axial direction; 15 is a first permanent magnet fixed to the lower part of the rotating body 2 in an annular manner with magnetic poles aligned in the axial direction; 16 is the first permanent magnet 15 and the magnetic pole , An annular second permanent magnet disposed so as to face in the axial direction, 8 a rotor of the motor generator, 9 a stator of the motor generator including a magnetic core 9a and n sets of winding groups 9b, 10 Is an inverter for supplying a rotating magnetic field to the winding group 9b, 17 is a first support for mounting the stator 9 to the storage container 3, 18 is a second support for mounting the second permanent magnet 16 to the storage container 3, 12 Is a timer having a timing function for controlling the inverter 10.

The second embodiment is different from the first embodiment in that a passive magnetic bearing is formed below the rotating body 2.

The components having the same reference numerals as in the first embodiment have the same structure, and the description is omitted.

Next, the operation and operation will be described. At night, the timer 12 operates so as to supply surplus power to the inverter 10, so that the winding group 9 is transferred from the inverter 10.
An n-phase current is supplied to generate a rotating magnetic field, and the rotating body 1 is rotated by the rotating magnetic field. Since the rotating body 1 is fixed to the rotating body 1, the rotating body 1 rotates at a predetermined rotation speed, and the supplied power is converted into rotational kinetic energy of the rotating body 1 and stored.

On the other hand, in the daytime, the electric power is generated by the above-mentioned conductive generator based on the rotational kinetic energy, and regenerative electric power is taken out from the inverter 10 and used.

Here, the first permanent magnet 15 and the second permanent magnet 16 are subjected to an upward force due to the same repulsive force, so that a predetermined proportion of the weight of the rotating body 1 is borne (reduction of thrust load). Acts to reduce bearing loss during high-speed rotation. In addition, since the reaction force applied to the first permanent magnet 15 is received by the bottom of the storage container 3, the configuration of the second support 18 is simplified.

(Embodiment 3) FIG. 3 is a sectional view of a main part of Embodiment 3 of the present invention.

In FIG. 3, 1 is a rotating body, 2 is its rotating shaft, 19 is a storage container, 4 is a first rolling bearing that supports the rotating body 1 in radial contact with the storage container 3, and 5 is a diameter. A second rolling bearing that supports in contact in the axial and axial directions, 20 is a first permanent magnet fixed to the lower part of the rotating shaft 2 in an annular and conical shape with magnetic poles aligned in the axial direction, 21 is a first permanent magnet 20
, A second permanent magnet in which the magnetic poles are axially opposed to each other, 8 is a rotor of the motor generator, 9 is a magnetic core 9a
And an inverter for supplying a rotating magnetic field to the winding group 9b; 17 a first for mounting the stator 9 to the housing 19;
Reference numeral 22 denotes a second support for attaching the second permanent magnet 7 to the storage container 19, and reference numeral 12 denotes a timer for controlling the inverter 10 and having a timing function.

The third embodiment is different from the first embodiment in that a passive magnetic bearing is formed below the rotating shaft 2.

The components having the same reference numerals as in the first embodiment have the same structure, and the description is omitted.

Next, the operation and operation will be described. At night, the timer 12 operates so as to supply surplus power to the inverter 10, so that the winding group 9 is transferred from the inverter 10.
An n-phase current is supplied to generate a rotating magnetic field, and the rotating body 1 is rotated by the rotating magnetic field. Since the rotating body 1 is fixed to the rotating body 1, the rotating body 1 rotates at a predetermined rotation speed, and the supplied power is converted into rotational kinetic energy of the rotating body 1 and stored.

On the other hand, in the daytime, the electric power is generated by the above-mentioned conductive generator based on the rotational kinetic energy, and regenerative electric power is taken out from the inverter 10 and used.

Here, the first permanent magnet 20 and the second permanent magnet 21 are subjected to an upward force due to the same repulsive force, so that a predetermined proportion of the weight of the rotating body 1 is borne (reduction of thrust load). Acts to reduce bearing loss during high-speed rotation. In addition, since the reaction force applied to the first permanent magnet 21 is received at the bottom of the storage container 19, the configuration of the second support 22 is simplified.

(Embodiment 4) FIG. 4 is a sectional view of a main part of Embodiment 4 of the present invention.

In FIG. 4, 1 is a rotating body, 2 is its rotating shaft, 3 is a storage container, 4 is a first rolling bearing that supports the rotating body 1 in radial contact with the storage container 3, and 5 is a diameter. 25 is a first permanent magnet arranged and embedded in a part of the rotating shaft 2 in a ring shape with magnetic poles aligned in the axial direction, 26 is a first permanent magnet 25 An annular second permanent magnet with its magnetic poles axially opposed to each other, 8 a rotor of the motor generator, 9 a stator of the motor generator comprising a magnetic core 9a and n sets of winding groups 9b. , 1
0 is an inverter for supplying a rotating magnetic field to the winding group 9b, 11
Is a support made of a non-magnetic material for attaching the stator 9 and the second permanent magnet 7 to the storage container 3, and 12 is an inverter 10
Is a timer having a timing function for controlling

The fourth embodiment differs from the first embodiment in that the magnetic poles are arranged in a part of the rotating shaft 2 so as to be buried annularly in the axial direction.

The components having the same reference numerals as in the first embodiment have the same structure, and the description will be omitted.

Next, the operation and operation will be described. At night, the timer 12 operates so as to supply surplus power to the inverter 10, so that the windings 9
An n-phase current is supplied to generate a rotating magnetic field, and the rotating body 1 is rotated by the rotating magnetic field. Since the rotating body 1 is fixed to the rotating body 1, the rotating body 1 rotates at a predetermined rotation speed, and the supplied power is converted into rotational kinetic energy of the rotating body 1 and stored.

On the other hand, in the daytime, based on the rotational kinetic energy, the electric power is generated by the conductive generator, and regenerative electric power is taken out from the inverter 10 and used.

Here, the first permanent magnet 25 and the second permanent magnet 26 are acted on by an upward force due to the same repulsive force to bear a predetermined proportion of the weight of the rotating body 1 (reducing the thrust load). Acts to reduce bearing loss during high-speed rotation.

(Embodiment 5) FIG. 5 is a sectional view of a main part of Embodiment 5 of the present invention.

In FIG. 5, 1 is a rotating body, 2 is its rotating shaft, 3 is a storage container, 4 is a first rolling bearing that supports the rotating body 1 in radial contact with the storage container 3, and 5 is a diameter. A second rolling bearing which supports in a contact direction and an axial direction, 28 is a first permanent magnet which is annularly magnetized on a part of the rotating shaft 2 with its magnetic poles aligned in the axial direction, and 29 is a first permanent magnet 28 An annular second permanent magnet with its magnetic poles axially opposed to each other, 8 a rotor of the motor generator, 9 a stator of the motor generator comprising a magnetic core 9a and n sets of winding groups 9b. Reference numeral 10 denotes an inverter for supplying a rotating magnetic field to the winding group 9b, reference numeral 17 denotes a first support for mounting the stator 9 to the storage container 3, and reference numeral 30 denotes a second support for mounting the second permanent magnet 29 to the storage container 3. , 12 are timers having a timing function for controlling the inverter 10.

The fifth embodiment is different from the first embodiment in that the magnetic pole is aligned with a part of the rotating shaft 2 in the axial direction to produce an annular magnetization.

The components having the same reference numerals as those of the first embodiment have the same structure, and the description is omitted.

Next, the operation and operation will be described. At night, the timer 12 operates so as to supply surplus power to the inverter 10, so that the winding group 9 can be switched from the inverter 10.
An n-phase current is supplied to generate a rotating magnetic field, and the rotating body 1 is rotated by the rotating magnetic field. Since the rotating body 1 is fixed to the rotating body 1, the rotating body 1 rotates at a predetermined rotation speed, and the supplied power is converted into rotational kinetic energy of the rotating body 1 and stored.

On the other hand, in the daytime, the electric power is generated by the above-mentioned conductive generator based on the rotational kinetic energy, and regenerative electric power is taken out from the inverter 10 and used. Here, the first
The permanent magnet 28 and the second permanent magnet 29 are subjected to an upward force due to the same repulsive force to bear a predetermined ratio of the weight of the rotating body 1 (reducing the thrust load) and reduce bearing loss during high-speed rotation. Acts to reduce. Further, since a part of the rotating shaft 2 is magnetized to be a permanent magnet, it can withstand higher-speed rotation.

(Embodiment 6) FIG. 6 is a sectional view showing a main part of a fifth embodiment of the present invention.

In FIG. 6, 1 is a rotating body, 2 is its rotating shaft, 3 is a storage container, 4 is a first rolling bearing that supports the rotating body 1 in radial contact with the storage container 3, and 5 is a diameter. A second rolling bearing for contacting and supporting in a direction and an axial direction, 31 is a first permanent magnet embedded and annularly embedded on the lower surface of the rotating body with magnetic poles aligned in the axial direction, 32 is a first permanent magnet 31 and a magnetic pole , An annular second permanent magnet disposed so as to face in the axial direction, 8 a rotor of the motor generator, 9 a stator of the motor generator comprising a magnetic core 9a and n sets of winding groups 9b, 1
0 is an inverter that supplies a rotating magnetic field to the winding group 9b;
Reference numeral denotes a support for attaching the stator 9 to the storage container 3, and reference numeral 12 denotes a timer for controlling the inverter 10 and having a timing function.

The sixth embodiment is different from the first embodiment in that the magnetic poles are arranged in the lower surface of the rotating body in the axial direction so as to be buried annularly.

The components having the same reference numerals as in the first embodiment have the same structure, and the description is omitted.

Next, the operation and function will be described. At night, the timer 12 operates so as to supply surplus power to the inverter 10, so that the windings 9
An n-phase current is supplied to generate a rotating magnetic field, and the rotating body 1 is rotated by the rotating magnetic field. Since the rotating body 1 is fixed to the rotating body 1, the rotating body 1 rotates at a predetermined rotation speed, and the supplied power is converted into rotational kinetic energy of the rotating body 1 and stored.

On the other hand, in the daytime, the electric power is generated by the above-mentioned conductive generator based on the rotational kinetic energy, and regenerative electric power is taken out from the inverter 10 and used.

Here, the first permanent magnet 31 and the second permanent magnet 32 are acted on by an upward force due to the same repulsive force to bear a predetermined proportion of the weight of the rotating body 1 (reducing the thrust load). Acts to reduce bearing loss during high-speed rotation. In addition, since it is embedded in the rotating body 1, it can withstand higher-speed rotation.

(Embodiment 7) FIG. 7 is a sectional view of a main part of Embodiment 5 of the present invention.

In FIG. 7, 1 is a rotating body, 2 is its rotating shaft, 3 is a storage container, 4 is a first rolling bearing that supports the rotating body 1 in radial contact with the storage container 3, and 5 is a diameter. A second rolling bearing 33 which is contact-supported in the direction and the axial direction, and a first roller 33 is annularly magnetized on the lower surface of the rotating body with its magnetic poles aligned in the axial direction.
Is a ring-shaped second permanent magnet in which the magnetic poles are opposed to the first permanent magnet 33 in the axial direction, 8 is a rotor of the motor generator, and 9 is a set of the magnetic material cores 9a and n. A stator of the motor generator including a winding group 9b, an inverter 10 for supplying a rotating magnetic field to the winding group 9b, a support 17 for attaching the stator 9 to the storage container 3, and a timing function 12 for controlling the inverter 10 Timer.

The seventh embodiment is different from the first embodiment in that the magnetic poles are aligned in the axial direction on the lower surface of the rotating body to produce a ring-shaped magnet.

The components having the same reference numerals as in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and the operation will be described. At night, the timer 12 operates so as to supply surplus power to the inverter 10, so that the windings 9
An n-phase current is supplied to generate a rotating magnetic field, and the rotating body 1 is rotated by the rotating magnetic field. Since the rotating body 1 is fixed to the rotating body 1, the rotating body 1 rotates at a predetermined rotation speed, and the supplied power is converted into rotational kinetic energy of the rotating body 1 and stored.

On the other hand, in the daytime, the electric power is generated by the above-mentioned conductive generator based on the rotational kinetic energy, and regenerative electric power is taken out from the inverter 10 and used.

Here, the first permanent magnet 33 and the second permanent magnet 34 are subjected to an upward force due to the same repulsive force, so that a predetermined proportion of the weight of the rotating body 1 is borne (reduction of thrust load). Acts to reduce bearing loss during high-speed rotation. Further, since the lower part of the rotating body 1 is magnetized to be a permanent magnet, it can withstand higher-speed rotation.

[0062]

Since the energy storage device of the present invention is constructed and operates as described above, it is possible to secure a sufficiently large load capacity and not only support a large load applied to the rotating part, but also perform a stable operation. It is possible to improve the performance of various types of mechanical devices having a rotating part.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing a second embodiment of the present invention.

FIG. 3 is a sectional view of a main part showing a third embodiment of the present invention.

FIG. 4 is a sectional view of a main part showing a fourth embodiment of the present invention.

FIG. 5 is a sectional view of a main part showing a fifth embodiment of the present invention.

FIG. 6 is a sectional view of an essential part showing a sixth embodiment of the present invention.

FIG. 7 is a sectional view of a main part showing a seventh embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating body 2 Rotating shaft 3 Storage container 4 1st rolling bearing 5 2nd rolling bearing 6 1st permanent magnet 7 2nd permanent magnet

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuya Koda 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Hideki Omori 1006 Odakadoma Kadoma City, Osaka Pref. Term (reference) 3J102 AA01 BA03 BA19 CA09 DA03 DA07 DA11 GA09 5H621 GA16 HH01 JK02 JK08 JK10 JK18 JK19

Claims (7)

[Claims] 1. A rotating body, a storage container for storing the rotating body, and first and second holding members in a predetermined operating position by supporting the rotating body in radial and axial directions with respect to the storage container. And a passive magnetic bearing in which an upward force is applied by permanent magnets arranged in an annular shape with magnetic poles aligned in the axial direction on the upper part of the rotating body, and a predetermined weight of the rotating body weight is applied to the magnetic bearing. An energy storage device characterized in that it bears a proportion. 2. A rotator, a storage container for storing the rotator, and first and second holders which contact and support the rotator in a radial direction and an axial direction with respect to the storage container and hold the rotator at a predetermined operating position. And a passive magnetic bearing that applies an upward force to the lower part of the rotating body with permanent magnets arranged in an annular shape with magnetic poles aligned in the axial direction, and a predetermined weight of the rotating body is applied to the magnetic bearing. An energy storage device characterized in that it bears a proportion. 3. A rotator, a storage container for storing the rotator, and first and second holders which contact and support the rotator radially and axially with the storage container and hold the rotator at a predetermined operating position. And a passive magnetic bearing in which a magnetic pole is aligned in the axial direction below a shaft passing through the center of the rotating body and an upward force is applied by a permanent magnet arranged in an annular and conical shape. An energy storage device, wherein a bearing bears a predetermined proportion of the weight of the rotating body. 4. A rotator, a storage container for storing the rotator, and first and second holding members in contact with the storage container in a radial direction and an axial direction to hold the rotator at a predetermined operating position. And a passive magnetic bearing configured to apply an upward force by a permanent magnet arranged in an annular shape with the magnetic poles aligned in the axial direction on a part of the shaft passing through the center of the rotating body,
An energy storage device, wherein the magnetic bearing bears a predetermined ratio of the weight of the rotating body. 5. A rotator, a storage container for storing the rotator, and first and second holding members in a predetermined operation position by supporting the rotator in radial and axial directions with respect to the storage container. And a passive magnetic bearing in which a magnetic pole is aligned with a part of a shaft passing through the center of the rotating body in the axial direction and an upward force is applied by a ring-magnetized permanent magnet. A predetermined proportion of the weight of the rotating body. 6. A rotator, a storage container for storing the rotator, and first and second holding members in a predetermined operating position by supporting the rotator in radial and axial directions with respect to the storage container. And a passive magnetic bearing in which magnetic poles are aligned in the axial direction on the lower surface of the rotating body and an upward force is applied by a permanent magnet arranged in a ring and embedded, and the weight of the rotating body is reduced by the magnetic bearing. An energy storage device characterized in that it bears a predetermined ratio. 7. A rotator made of a ferromagnetic material, a storage container for storing the rotator, and supporting the rotator in a radial direction and an axial direction with respect to the storage container to hold the rotator at a predetermined operating position. The magnetic bearing comprises a first and a second bearing, and a passive magnetic bearing in which magnetic poles are aligned in the axial direction on a lower surface of the rotating body and an upward force is applied by a ring-magnetized permanent magnet. An energy storage device, wherein a predetermined ratio of the weight of the rotating body is borne.