JPH10136609A - Motor and storage apparatus using the wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a motor which is capable of high-speed rotation and has little loss and long service life by firmly-disposing a superconducting bearing, consisting of a superconducting conductor in a superconducting state with a cooling member which has a stator in it, so as to face a bearing permanent magnet. SOLUTION: A rotor part 1 is constituted of a permanent magnet rotor 3 for motor fixed in the center of a rotating shaft 2, and bearing permanent magnet rotors 4a, 4b fixed at both ends of the rotating shaft 2. The permanent magnet rotor 3 for motor is constituted of a permanent magnet 7 and a back yoke 8 of magnetic material at its inner periphery part. The bearing permanent magnet rotors 4a, 4b are constituted of annular permanent magnets 5a, 5b and back yokes 13a, 13b of magnetic material. A stationary body part 9, in which annular superconducting conductors 11a, 11b and a motor coil 12 are formed in the inside of a cooling case 10, and is cooled by a refrigerant, such as liquid nitrogen enclosed in the cooling case.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor having a problem in bearing loss, such as a motor requiring high-speed rotation and a micro motor, and a power storage device for storing electric power by rotational energy.

[0002]

2. Description of the Related Art By rotating a large inertial body at high speed,
It was mentioned that the feature of the technology of storing power by rotational energy is that it has higher efficiency and longer life than other power storage methods. The former characteristic, high efficiency, will be described with a specific example. There are two main factors that cause power loss. One is the loss of the motor to convert electrical energy into mechanical energy. The second is a loss of a bearing for rotating the inertial body at a high speed. Regarding the first element, a motor, for example, in a flywheel type power storage device described in Proceedings 12-152 to 12-155 of the 1993 IEEJ, a coreless synchronous flat motor is used. I have. Since the motor does not have a stator core, no iron loss occurs in the stator, and the motor has a highly efficient structure. In addition, regarding the bearing, which is the second factor that affects the efficiency, the bearing that supports the inertial body and the bearing of the motor that is used to store power are often commonly used in many cases. For example, in the above described example,
Rather than bearings specific to the motor being used, the structure serves as a bearing that supports the motor and the inertial body. In order to reduce the rotation loss, in the above-described example, an attraction type permanent magnet is arranged at the upper part of the bearing, and a repulsion type permanent magnet is arranged at the lower part of the bearing to support 90% of the total weight, and the remaining 10% Is supported by a pivot type bearing. Further, as a method of further reducing the loss due to the contact of the bearing portion, there is an example in which a superconducting magnetic bearing is used as the bearing as in the example described in JP-A-6-129427 in order to achieve complete non-contact. In this example, since the bearing is completely out of contact,
There is almost no bearing loss.

On the other hand, with regard to the extension of the life, which is the latter feature, the life of the inertial body and the bearing supporting the motor is dominant. Therefore, the bearing generally used for a high-speed rotation type motor as in the above-described example is not a contact type with a rotating shaft such as a rolling type, but a pivot type bearing utilizing fluid pressure of about 10%. Using the load factor of
A structure that prevents solid contact between the rotating shaft and the bearing with a fluid has been adopted. Since the pivot type bearing causes solid contact at the time of start and stop of rotation, and at the same time contacts with fluid at the time of rotation, wear of the bearing cannot be completely eliminated. Therefore, a device in which complete non-contact is achieved, such as the example described in JP-A-6-129427, has appeared.

[0004]

However, the prior art described in the above cited reference has the following problems.

[0005] In a system in which the coreless motor of the above-described example is used to improve the efficiency of the motor, there is no iron loss due to the absence of a core, but there is copper loss caused by coil resistance. Among the motor loss factors, the proportion occupied by copper loss is substantially equal to iron loss, and is very large. Therefore, in order to further reduce the motor loss, it is necessary to reduce the copper loss, and for that purpose, the resistance value of the coil must be reduced. Also,
The copper loss generates heat in the coil itself, and the heat generated may cause a vicious cycle in which the coil resistance value increases and the loss further increases. In particular, in the coreless type motor as described in the description, since there is no heat radiation core for suppressing heat generation, heat generation is more likely to occur.

On the other hand, in each of the above described examples, the motor and the inertial body are directly connected on the same axis, so that the motor speed and the rotational speed of the inertial body are the same. In order to efficiently store electric power in a limited volume, it is desirable that the inertial body and the motor can change the number of revolutions, but as described in the description example, a relatively large flywheel type electric power storage device is used. In many cases, the limit value of the rotation speed depends on the rigidity and strength of the rotating shaft, and providing a transmission device such as a speed reducer or a speed increasing device that changes the rotation speed lacks stability of the entire device. Thus, the provision of a transmitter is not used to create a new loss factor for the entire device.

[0007]

According to a first aspect of the present invention, there is provided a motor comprising a rotor, a stator, and a bearing for supporting a rotating shaft of the rotor. A permanent magnet for a bearing fixed coaxially with the rotor and a superconducting bearing composed of a superconductor that is fixedly arranged to face the permanent magnet for the bearing and is in a superconducting state by a cooling member, wherein the cooling member The stator is disposed inside. A motor according to a second aspect of the present invention is a motor comprising a rotor, a bearing for supporting a rotating shaft of the rotor, and a transmission unit for transmitting a rotational force of the rotor, wherein the bearing is coaxial with the rotor. A superconducting bearing composed of a permanent magnet for a bearing fixed to and a superconductor fixedly arranged to face the permanent magnet for a bearing is used, and the transmission means uses an attractive force or a repulsive force of the permanent magnet. A non-contact type transmission means including a plurality of multi-pole magnets is used.

[0008] In the motor according to the third aspect of the present invention, the rotor is made of a permanent magnet, and the stator is made of a winding.

In a motor according to a fourth aspect of the present invention, the permanent magnet for bearing comprises two disk-shaped permanent magnets magnetized in the axial direction, and faces the same poles of the two disk-shaped permanent magnets; A configuration in which a magnetic body is inserted between them is provided.

In a motor according to a fifth aspect of the present invention, two superconducting bearings are arranged with the rotor interposed therebetween.

In the motor according to the sixth aspect of the present invention, the radial force of the superconducting bearing is larger than the attraction force or repulsion force of the permanent magnet in the non-contact transmission means, and more specifically, is ten times or more. .

According to an eighth aspect of the present invention, in the power storage device, a motor including a rotor, a stator, and a bearing for supporting a rotating shaft of the rotor, and an inertial body fixed on the same axis as the rotating shaft, In a power storage device that stores energy, the bearing includes a permanent magnet for bearing fixed coaxially with the rotor and a fixed magnet disposed opposite to the permanent magnet for bearing, and a superconducting member in a superconducting state by a cooling member. A superconducting bearing made of a body is used, and the stator is disposed inside the cooling member. According to a ninth aspect of the present invention, there is provided a power storage device, comprising: a motor comprising a rotor, a bearing for supporting a rotating shaft of the rotor, and transmission means for transmitting the rotational force of the rotor; Is fixed, and in the power storage device that stores power by the rotational energy of the inertial body, the bearing is provided with a permanent magnet for a bearing fixed coaxially with the rotor and fixedly arranged so as to face the permanent magnet for the bearing. A superconducting bearing made of a superconductor is used, and a non-contact type transmitting means made up of a plurality of magnets is used as the transmitting means.

The power storage device according to claim 10 of the present application has a configuration in which the diameters of the plurality of magnets are different from each other.

The power storage device according to the eleventh aspect of the present invention has a configuration in which the multipole magnet has irregularities in the radial direction.

In a power storage device according to a twelfth aspect of the present invention, two superconducting bearings are arranged with the rotor interposed therebetween.

According to a thirteenth aspect of the present invention, in the power storage device, a motor comprising a rotor, a bearing for supporting a rotating shaft of the rotor, and a transmitting means for transmitting the rotational force of the rotor, and a coaxial shaft of the transmitting means. In a power storage device in which an inertial body is fixed and the power is stored by the rotational energy of the inertial body, the bearing includes a bearing permanent magnet fixed coaxially with the rotor and a bearing permanent magnet. A superconducting bearing made of a fixedly arranged superconductor is used, a non-contact type transmitting means made up of a plurality of magnets is used as the transmitting means, and the rotational center of gravity of the inertial body is set at the center of the rotating shaft. There is no structure.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIG. 1 is a longitudinal sectional view of a motor according to the present invention.
The rotating body 1 includes a motor permanent magnet rotating body 3 fixed to the center of the rotating shaft 2 and bearing permanent magnet rotating bodies 4a and 4b fixed to both ends of the rotating shaft 2. The permanent magnet rotating body 3 for a motor is constituted by a permanent magnet 7 and a back yoke 8 formed of a magnetic material on an inner peripheral portion.
Further, the permanent magnet rotating bodies 4a and 4b for bearings are made of a ring-shaped permanent magnets 5a and 5b and a back yoke 13 made of a magnetic material.
a and 13b. On the other hand, the fixed body portion 9 is provided with annular superconductors 11a and 11b and a motor coil 12 inside a cooling case 10, and is cooled by a refrigerant such as liquid nitrogen sealed in the cooling case.
In this embodiment, the superconductors 11a and 11b are made of an yttrium-based high-temperature superconductor, for example, a substrate made of YBa2Cu3OX in which normal conducting particles Y2Ba1Cu1 are uniformly mixed. It has the property of restricting the intrusion of generated magnetic flux. Superconductor 1
The axial widths of the permanent magnet rotating bodies 1a, 11b and the bearing permanent magnet rotating bodies 4a, 4b are set substantially equal. Furthermore, the superconductor 1
Reference numerals 1a and 11b radially face the bearing permanent magnet rotating bodies 4a and 4b. At a position where a predetermined amount of magnetic flux from the bearing permanent magnet rotating bodies enters, a distribution of invading magnetic flux due to rotation of the rotating body portion 1 is provided. Are arranged at positions where does not change. In such a configuration, the superconductors 11a,
11b is cooled by the circulating refrigerant in the cooling case 10,
It is kept in a superconducting state. In the superconducting state, magnetic flux from the permanent magnet rotating bodies 4a, 4b of the rotating body portion 1 penetrates into the superconductors 11a, 11b, and the superconductor 11
Inside the superconductors 11a and 11b, the distribution of the magnetic flux penetrating inside the superconductors 11a and 11b becomes constant due to the uniformly mixed normal conductor particles inside the superconductors 11a and 11b. As if the magnet rotating bodies 4a and 4b were penetrated, the rotating body part 1 was fixed to the bearing permanent magnet rotating bodies 4a and 4b.
In a state (pinning phenomenon) restrained by superconductors 11a and 11b together with b, permanent magnet rotating bodies 4a and 4
b It is possible to rotate smoothly without friction, and the superconductors 11a, 11b and the permanent magnet rotating bodies 5a, 5
b constitutes a superconducting bearing. On the other hand, the motor permanent magnet rotating body 3 for driving the motor is multipole-magnetized in the circumferential direction, and is arranged with a predetermined gap in the radial direction from the coil 12 arranged in multiple poles. Since the coil 12 uses a copper wire and is cooled by a refrigerant,
The resistance value decreases. For example, in this embodiment, liquid nitrogen is used, and the resistance value of the coil 12 using a copper wire is approximately halved in a liquid nitrogen atmosphere, so that copper loss can be significantly reduced. If a superconducting wire, particularly a high-temperature superconducting wire, is used as the wire used for the coil 12, copper loss is eliminated and an ultra-high-efficiency motor with almost no loss is obtained. As described above, in this embodiment, a motor is realized in which the rotating body 1 and the fixed body 9 are completely non-contact and have almost no loss.

(Embodiment 2) Next, an embodiment in which the rigidity of the superconducting bearing is increased will be described with reference to FIG. FIG. 2 is a longitudinal sectional view of the motor. Regarding the cooling structure of the fixed body part 9,
Since each of the embodiments described below is the same as the first embodiment, the description is omitted. Further, description of the other parts having the same structure as in the first embodiment will be omitted. The rotating body 1 includes a motor permanent magnet rotating body 3 fixed to the center of the rotating shaft 2 and bearing permanent magnet rotating bodies 4a and 4b fixed to both ends of the rotating shaft 2. The permanent magnet rotating body 3 for a motor is constituted by a permanent magnet 7 and a back yoke 8 made of a magnetic material on an inner peripheral portion. The permanent magnet rotor 4a for bearings is configured such that the magnetized directions of the disk-shaped permanent magnets 5a and 5b are opposite to each other with the magnetic body 6a interposed therebetween, and the same applies to the permanent magnet rotor 4b for bearings. The permanent magnets 5c, 5d are formed in such a manner that the magnetized directions of the disk-shaped permanent magnets 5c, 5d are opposite to each other with the magnetic body 6b interposed therebetween. The permanent magnet rotating body 4a for a bearing will be described in detail with reference to FIG. FIG. 3 is a diagram showing magnetic lines of force of the permanent magnet rotating body for bearing 4a in FIG. In FIG. 3, disk-shaped permanent magnets 5a, 5
The magnetic flux emitted from the N pole of b passes through the magnetic body 6a and returns to the S pole of each of the disk-shaped permanent magnets 5a and 5b. At this time, since the magnetic flux from the disk-shaped permanent magnets 5a and 5b is constricted by the magnetic material 6a, the magnetic flux density acting on the superconductor 11a shown in FIG. The withstand load and rigidity will increase. Further, as another effect, it plays a role of alleviating the magnetic flux unevenness of the disk-shaped permanent magnets 5a and 5b. That is, the disk-shaped permanent magnets 5a,
5b has variations in surface magnetic flux density and unevenness in the production, and unevenness in the magnetic flux in the circumferential direction of rotation causes rotational energy loss inside the superconductor 11a. However, the magnetic flux unevenness of the disk-shaped permanent magnets 5a and 5b is reduced by the magnetic material 6a.
Can be diffused, and rotational energy loss can be reduced. On the other hand, the magnitude of the magnetic flux density peak is
It is possible to change the thickness by changing the axial thickness of the magnetic body 6a. In order to exert the effect of the present invention, the thickness of the magnetic body 6a should be a disc-shaped permanent magnet 5a,
5b must be thinner, but if it is too thin, not only the effect is reduced, but also another advantage of the present embodiment is obtained.
Thus, the effect of alleviating the magnetic flux unevenness in the rotating circumferential direction, which is one effect, is reduced. In this embodiment, the thickness of the magnetic body 6a is selected so that the magnetic flux in the magnetic body 6a is immediately before the saturation state.
Although only two disc-shaped permanent magnets constituting a superconducting magnetic bearing are used in the present embodiment, a multi-layer structure can provide a larger bearing load and rigidity. is there.

(Embodiment 3) Next, an example in which a transmission mechanism is provided on the output shaft of the motor to perform acceleration / deceleration will be described. FIG. 4 shows a sectional view of this embodiment. The structure related to the rotation of the motor is the same as that described in FIG. In each of the following embodiments, unless otherwise described, the operation of the motor is the same, and the description is omitted. The tip of the rotating shaft 2 of the rotator 1 forms a transmission mechanism for transmitting the rotational force. A back yoke 13f made of a magnetic material is fixed to the rotating shaft 2, and an annular permanent magnet 5f that is magnetized to have multiple poles in the axial direction is attached to the outer periphery of the back yoke 13f. The rotational force of the rotator 1 is transmitted to the rotator 14. In the rotating body portion 14, two annular permanent magnets 5c and 5d for forming a bearing are fixed to the rotating shaft 17 together with the back yokes 13c and 13d, and the annular permanent magnets 5e for transmitting the rotational force. Are fixed to the tip of the rotating shaft 17 together with the back yoke 13e. Annular permanent magnet 5
c and 5d are radially magnetized and constitute a superconducting bearing between the annular superconductors 11c and 11d facing each other in the axial direction, and the rotating body portion 14 is pinned to fix the movement except in the rotating direction. Force acts and has shaft rigidity. Back yoke 1
Attraction force acts on the annular permanent magnet 5e attached to the outer periphery of 3e with the adjacent annular permanent magnet 5f. FIG. 5 shows this state viewed from the axial direction. In FIG. 5, the ring-shaped permanent magnet 5f is radially magnetized with four poles, and the attractive force acts while maintaining a non-contact state between the ring-shaped permanent magnet 5e and the ring-shaped permanent magnet 5e radially magnetized to 16 poles. Therefore, the annular permanent magnet 5e rotates together with the rotation of the annular permanent magnet 5f. That is, the magnetic transmitter is configured by the annular permanent magnet 5f and the annular permanent magnet 5e. Annular permanent magnet 5d and annular superconducting 1
Annular permanent magnets 5e, 5f rather than the radial force acting on 1d
It is needless to say that the outer peripheral portions of the annular permanent magnets 5e and 5f are attracted unless the attraction force acting between them is made smaller. Generally, the radial force acting on the annular permanent magnet 5d and the annular superconducting 11d is
If the suction force between e and 5f must be 10 times or more,
The whole rotating system becomes unstable. Rotating body part 1 of motor
The gear ratio of the rotating body portion 14 is determined by the ratio of the radius of the annular permanent magnet 5f to the radius of the annular permanent magnet 5e. In this case, the annular permanent magnet 5f and the annular permanent magnet 5e radially opposed to each other.
In general, the circumferential magnetic pole width of the outer peripheral portion is substantially the same, but the magnetic pole width needs to be different in order to suppress vibration during transmission. In addition, the annular superconductors 11a, 11
b, 11c and 11d are fixed in the cooling cases 15a and 15b, and a coolant such as liquid nitrogen is circulated in the cooling cases 15a and 15b to form annular superconductors 11a and 11d.
b, 11c, and 11d maintain the superconducting state. Also,
The cooling cases 15a and 15b are fixed to the housing 16, and mechanically support the motor and the transmission mechanism. With the above configuration, it is possible to change the speed and output the torque while keeping the rotational force of the motor in a completely non-contact state, and it is possible to realize characteristics that are difficult to realize with the motor alone. Further, since there is basically no mechanical contact portion, a long-life motor can be realized. Further, even if external vibrations and shocks are applied to the rotating shaft 17 serving as the output shaft, the superconducting magnetic bearing has a non-contact damper because the mechanism of the present embodiment has no direct solid contact portion. It plays a role and makes it possible to minimize the influence of load fluctuation on the rotating shaft 1 of the motor.

Although the annular permanent magnets 5e and 5f used in the magnetic transmitter are only examples using multi-pole radial magnets, any other method capable of transmitting rotational force magnetically may be used.
All applicable. For example, one of the permanent magnets 5e and 5f may be made of a magnetic material such as iron instead of a permanent magnet to provide the outer peripheral portion of the magnetic material. That is, the permanent magnet 5e performs multi-pole radial magnetization, and instead of the permanent magnet 5f, by using iron on the outer peripheral portion having irregularities substantially the same as the magnetized dimension of the outer peripheral portion of the permanent magnet, Example 3
The same operation as the example described in can be performed. In addition, even when a permanent magnet is used, the permanent magnet is not multipolar magnetized, and the outer peripheral portion of the permanent magnet is provided with irregularities so that the magnetic flux density changes in the outer peripheral portion even when the magnetizing is performed only with two poles. Is possible, it is possible to perform non-contact transmission of torque with the force generated by the change in the magnetic flux density. The above-described method of non-contact transmission of rotational force is also applicable to the following embodiments.

(Embodiment 4) Next, an example in which a power storage device is constructed using a complete non-contact motor will be described with reference to FIG.
In FIG. 6, the basic structure of the motor is the same as that described with reference to FIG. An inertial body 18 is fixed to the tip of the rotating shaft 2 of the rotating body 1, and the rotational energy of the rotating body 1 is stored by the inertial body 18. Each mechanism is disposed in a vacuum vessel 19 in order to eliminate windage damage caused by rotation of the rotating body 1. Rotation of the rotator 1 is performed by a rotating magnetic field generated by a coil 12 of a ring-shaped permanent magnet with multipoles radially magnetized. In this embodiment, the most common synchronous three-phase bipolar system is used as the motor, and the coil 12 is supplied with three-phase alternating current generated by the control circuit 20. Since the motor also functions as a generator, the stored rotational energy of the inertial body 18 is converted from the coil 12 into electric energy by the control circuit 20 as a three-phase alternating current. Control circuit 2
Numeral 0 functions as an inverter when rotating the rotator 1 and functions as a converter when operating the rotator 1 as a generator. The control circuit 20 and the coil 12 are connected by an electric cable 21, and the inside of the vacuum vessel 19 is kept airtight when being drawn out. Increasing the stored energy is one of the most important requirements for a power storage device, and in order to obtain large rotational energy in a limited volume, a tungsten-based material having a large specific gravity in the material forming the inertial body 18 is required. It can be realized by using metal and rotating at high speed. The stored energy is approximately proportional to the weight of the inertial body and proportional to the square of the rotation speed. Therefore, in order to accumulate larger energy,
Although this can be achieved by increasing the rotation speed, the rotation limit is determined by the strength and the rotation loss of the rotating body. Generally, when the rotating body has a diameter of several centimeters or less, the rotation loss often determines the upper limit of the rotation speed rather than the rotation strength. In, the rotation speed can be increased to the limit. Therefore,
In some cases, a material having high mechanical strength is more suitable for the material of the inertial body. In addition, tens of thousands to hundreds of thousands of rpm
m, the rigidity of the entire rotator 1 may be a problem.
By integrating the ring-shaped permanent magnets 5a and 5b, the ring-shaped permanent magnet 7, the inertial body 18, and the like, the rigidity of the rotating body portion 1 can be increased. In the present embodiment, an example in which the inertial body 18 is attached to only one end of the rotating shaft 2 has been described. However, a structure in which the inertia body 18 is attached to both ends of the rotating shaft 2 in order to increase the overall balance and rigidity of the rotating body 1 is also possible. . With the above structure, energy can be stored, that is, electricity can be stored in a small size, and since there is no contact portion, an ideal power storage device with excellent durability can be realized. Therefore, since there is no need to replace the battery due to its life, as in the case of a secondary battery or the like, the device is suitable for a device in which battery replacement is difficult.

(Embodiment 5) An example in which a power storage device is configured by using a motor having the transmission will be described.

FIG. 7 shows the configuration of the embodiment. The rotational force of the motor is fixed to the rotating shaft 2, and from a ring-shaped permanent magnet 5 f circumferentially multi-polarized to a multi-pole magnetized circumferentially multi-polarized magnet like the permanent magnet 5 f. Permanent magnet 5
The suction force acts on e and is transmitted. In the example shown in FIG. 6, since the diameter of the annular permanent magnet 5f is set smaller than the diameter of the annular permanent magnet 5e, when the rotation of the rotating body 1 of the motor is transmitted to the rotating body 14, Deceleration will occur. In the present embodiment, the rotating shaft 17 is supported by two superconducting bearings in the rotating body portion 14, and an inertia body 18 is fixed to a tip of the rotating shaft 17. The superconducting magnetic bearing comprises an annular permanent magnet 5c and an annular superconductor 11
c and the combination of the annular permanent magnet 5d and the annular superconductor 11d. In the present embodiment, when vibration or impact is applied to the inertial body 18 from the outside, the influence on the rotating body 1 rotating at a high speed is extremely small. This is because there are so many parts having a magnetic damper effect that almost no vibration or shock applied to the inertial body 18 is applied to the rotating body 1. In this embodiment, the example in which the inertial body 18 reduces the rotation of the rotating body portion 1 has been described, but the gear ratio can be freely varied by adjusting the diameter of the annular permanent magnet 5f and the annular permanent magnet 5e. It is possible.

(Embodiment 6) In the above embodiments, the method of storing energy by rotating a motor has been described. However, in this embodiment, the motor is not electrically rotated, but the inertial body is not rotated. An example of direct rotation will be described. FIG. 8 shows an example in which the center of gravity of the inertial body 18 is shifted from the center. FIG. 9 shows only the inertial body 18 of FIG. In FIG. 9, the inertial body 18 has a half-moon shape, and the inertial body 18 is freely rotated or
The oscillating motion is performed to rotate the rotating body 1 serving as a generator.
In this embodiment, since the inertial body 18 is in a completely unbalanced state, the rotation of the rotating shaft 14
May cause large shaft vibration. Therefore, an example in which the radial shaft rigidity of the rotating shaft 14 is increased is shown in FIG. The superconducting magnetic bearing used in FIG. 10 is of an axial type, in which the axial rigidity in the radial direction is greatly increased. FIG.
, The annular permanent magnet 22
a and 22b are fixed. Annular permanent magnet 22a,
Each of the magnetic poles 22b is magnetized in the radial direction such that the same poles face each other with the annular magnetic body 6a interposed therebetween. The magnetic flux is converged in the annular magnetic body 6a and generates a strong magnetic field with respect to the axially opposed annular superconductor 11c. Similarly, the annular permanent magnets 22c and 22d attached near the inertial body 18 also generate a strong magnetic field with respect to the annular superconductor 11d from the annular magnetic body 6b. A superconducting bearing having such a structure has a large radial rigidity and a large radial load because the magnetic flux in the radial direction changes rapidly. Therefore,
It is possible to strongly suppress the rotational vibration of the inertial body 18 having a large imbalance, and realize a highly efficient power storage device with no rotational loss. The permanent magnets that can be used in each of the embodiments described above are applicable to all permanent magnets such as rare earth, ferrite, and alnico, and further applicable to all those that generate magnetic flux, such as electromagnets and superconducting coils.
The superconductor itself, in which the magnetic flux is confined by the pinning effect, can be used as a permanent magnet. Further, as for the superconductor, an yttrium high-temperature superconductor has been described as an example. However, for example, a rare-earth element containing a rare earth element capable of having a restoring force with a magnet (RE-Ba-
All superconductors such as Cu-O) can be applied. Here, RE is Y, Sm, Eu, Nd, Dy, Ho, Er,
Represents one or more elements selected from the group consisting of Yb. Also, an example in which circulating cooling using liquid nitrogen is used as a cooling method for the superconductor has been described, but any cooling method such as direct or indirect cooling using a refrigeration cycle or cooling using a thermoelectric element can be applied.

[0025]

As described above, the present invention provides a low-loss, long-life motor capable of high-speed rotation, and a small and highly efficient power storage device using the motor. By minimizing all loss factors,
A long-life power storage device with little energy leakage and no need for replacement can be realized. In particular, the power storage device of the present invention has almost no restriction on the upper limit of the rotational speed of the inertial body. Therefore, by increasing the rotational speed of the inertial body to the limit, the energy density can be greatly improved. In addition, such a power storage device having a high energy density, a small size, and a long life can be applied to any device using a battery as a main or auxiliary power source, and in particular, miniaturization of devices such as electronic devices for wrists and other portable devices. As a result, the effect becomes more prominent. In addition, since the service life is so long that the replacement is basically unnecessary, it is suitable for a device in which battery replacement is difficult.

[Brief description of the drawings]

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

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

FIG. 3 is a sectional view of a main part showing a flow of lines of magnetic force of a permanent magnet rotor according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing a main part of a motor according to a third embodiment of the present invention.

FIG. 5 is a sectional view showing a main part of the magnetic transmitter according to a third embodiment of the present invention, when FIG. 4 is viewed from an axial direction;

FIG. 6 is a sectional view of a power storage device according to a fourth embodiment of the present invention.

FIG. 7 is a cross-sectional view of a power storage device according to a fifth embodiment of the present invention.

FIG. 8 is a sectional view of a power storage device according to a sixth embodiment of the present invention.

FIG. 9 is a perspective view of the inertial body part of FIG. 8 according to the sixth embodiment of the present invention.

FIG. 10 is a sectional view of a power storage device according to a sixth embodiment of the present invention.

[Explanation of symbols]

1,14 rotating body part 2,17 rotating shaft 3 permanent magnet rotating body for motor 4a, 4b permanent magnet rotating body for bearing 5a, 5b, 5c, 5d, 5e, 5f, 7,22a, 2
2b, 22c, 22d Permanent magnet 6a, 6b Magnetic body 8, 13a, 13b, 13c, 13d, 13e, 13f
Back yoke 9 Fixed body part 10, 15a, 15b, 15c
Cooling cases 11a, 11b, 11c, 11d
Superconductor 12 coil 16 housing 18 inertia body 19 vacuum vessel 20 control circuit 21 electric cable

Claims (13)

[Claims] 1. A motor comprising a rotor, a stator, and a bearing supporting a rotating shaft of the rotor, wherein the bearing includes a permanent magnet for a bearing fixed coaxially with the rotor, and a permanent magnet for the bearing. A superconducting bearing made of a superconductor that is fixedly disposed so as to face the cooling member and is superconductive by a cooling member, and wherein the stator is disposed inside the cooling member. 2. A motor comprising a rotor, a bearing for supporting a rotating shaft of the rotor, and a transmission means for transmitting a rotating force of the rotor, wherein the bearing is coaxially fixed to the bearing. A superconducting bearing composed of a permanent magnet for bearing and a superconductor fixedly arranged so as to face the permanent magnet for bearing is used, and a plurality of magnets using attraction or repulsion of the permanent magnet are used as the transmission means. A motor using non-contact type transmission means comprising a pole magnet. 3. The motor according to claim 1, wherein the rotor comprises a permanent magnet, and the stator comprises a winding. 4. The permanent magnet for bearing is composed of two disk-shaped permanent magnets magnetized in an axial direction, facing the same poles of the two disk-shaped permanent magnets, and a magnetic material is inserted between them. The motor according to claim 1, wherein the motor has a configuration. 5. The superconducting bearing is provided with two parts with the rotor interposed therebetween.
The motor according to claim 1, wherein the plurality of motors are arranged. 6. The motor according to claim 1, wherein a radial force of said superconducting bearing is larger than an attraction force or a repulsion force of said permanent magnet in said non-contact transmission means. 7. The superconducting bearing according to claim 1, wherein a radial force of the superconducting bearing is at least 10 times or more than an attraction force or a repulsion force of the permanent magnet in the non-contact transmission means. motor. 8. A power storage device in which an inertial body is fixed coaxially with a motor including a rotor, a stator, and a bearing that supports a rotation shaft of the rotor, and an inertial body is fixed on the same axis as the rotation shaft. The bearing uses a permanent magnet for bearing fixed coaxially with the rotor and a superconducting bearing composed of a superconductor which is fixedly arranged to face the permanent magnet for bearing and is in a superconducting state by a cooling member. The power storage device, wherein the stator is disposed inside the cooling member. 9. A motor comprising a rotor, a bearing for supporting a rotating shaft of the rotor, and a transmission means for transmitting the rotational force of the rotor, and an inertial body fixed on the same axis as the transmission means, In a power storage device that stores power by rotational energy of an inertial body, the bearing includes a permanent magnet for a bearing fixed coaxially with the rotor and a superconductor fixed and arranged to face the permanent magnet for the bearing. A power storage device using a superconducting bearing, and further using a non-contact type transmission unit including a plurality of multipolar magnets as the transmission unit. 10. The power storage device according to claim 8, wherein the plurality of multipole magnets have different diameters. 11. The power storage device according to claim 8, wherein the multipole magnet has irregularities in a radial direction. 12. The superconducting bearing according to claim 8, wherein two superconducting bearings are arranged with the rotor interposed therebetween.
The power storage device according to any one of the above. 13. A motor comprising a rotor, a bearing for supporting a rotating shaft of the rotor, and a transmitting means for transmitting a rotating force of the rotor, and an inertia body fixed on the same axis as the transmitting means. In a power storage device that stores power by rotational energy of an inertial body, the bearing includes a permanent magnet for a bearing fixed coaxially with the rotor and a superconductor fixed and arranged to face the permanent magnet for the bearing. A power storage device, wherein a superconducting bearing is used, a non-contact type transmission means including a plurality of magnets is used as the transmission means, and the center of rotation of the inertial body is not set at the center.