JP2002247822A - Synchronous motor generator with gap adjusting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of a high voltage during high speed rotation even without weak field control and to generate a stable output torque for the rotation up to high speed rotation from a low speed rotation. SOLUTION: A motor generator is structured with a rotor 4 of a permanent magnet fixed to an FW rotor 2 and a stator 5 provided keeping an axial gap (g). A position adjustor 9 vertically moves the stator 5 to variably adjust the gap (g). When the FW rotor 2 is rotating at a lower speed, the position adjustor 9 moves downward the stator 5 with a rotating speed signal to make narrower the gap (g). Accordingly, a magnetic flux ϕ between the rotor 4 and stator 5 increases to increase and induced voltage and a torque. During the high speed rotation, the position adjustor 9 moves upward the stator 5 with the rotation speed signal to widen the gap (g). As a result, the magnetic flux ϕ between the rotor 4 and stator 5 is reduced to reduce the induced voltage. Accordingly, the induced voltage can be lowered to the desired generated voltage with higher efficiency during the high speed rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a synchronous motor generator, and more particularly to a structure of a power storage flywheel device having an axial gap between a rotor and a stator of the synchronous motor generator.

[0002]

2. Description of the Related Art Conventionally, as a means for storing electric power, there are a pumping type, a battery charging type, a compressed air type and the like. Recently, a flywheel (hereinafter, FW) device for mechanically storing electric energy has attracted attention. Have been. Such FW
The device performs power storage by rotating the FW at an ultra-high speed by a synchronous motor generator.In recent years, high-strength materials such as FRP made of carbon fiber, rare earth magnets such as samarium cobalt with strong magnetic force, Due to improvements in technologies such as high-temperature superconductivity, highly efficient power storage FW devices are being put to practical use. In the following description, the synchronous motor generator is simply referred to as a motor generator, and the power storage FW using the same is used.
The description will be developed using the device as an example.

[0003] As the above-mentioned power storage FW device, a so-called radial gap type in which a gap between a rotor and a stator of a motor and a generator is in a radial direction is generally widely known. However, in recent years, a so-called axial gap type in which the gap between the rotor and the stator is parallel to the rotation axis has been developed. Among them, in the former radial gap type power storage FW device, the entire length of the rotating shaft of the FW rotor becomes long, and there is a possibility that shaft vibration is caused during high-speed rotation and shaft rigidity causes breakage of the shaft. Further, when the rotating shaft is slightly eccentric, a magnetic attraction force is generated by the motor generator in the eccentric direction, the eccentricity of the rotating shaft is further increased, and the supporting force of the magnetic bearing in the radial direction is greatly increased. Alternatively, the magnetic attraction force of the motor generator and the support force of the magnetic bearing may induce vibration oscillation. Also,
The thrust load is supported by the magnetic force of the permanent magnet and the superconducting magnet for magnetically levitating the FW rotor, and there is also a problem that the load burden on these becomes considerably large.

In order to solve the problems of shaft eccentricity, shaft vibration, shaft rigidity and the like as described above, and to reduce a thrust load, a FW device using an axial gap type motor generator is being developed. . Since such an axial gap type FW device is under development, a configuration in which a general motor generator using an axial gap type motor generator in the related art is applied to the FW device will be described. FIGS. 2A and 2B are structural diagrams in a case where an axial gap type motor generator according to the related art is applied to an FW device. FIG. 2A is a top view of a permanent magnet rotor, and FIG. 2B is a cross-sectional structural diagram of the FW device. . In the FW device using this axial gap type motor generator, the rotors 12 and 12 ′ having the same structure are symmetrically supported on the rotating shaft 11 on both sides of the stator 15 as shown in FIG. It is configured to be arranged. Therefore, in the following description, one side will be described, but the configuration of the other side will be read as an upside down position.

In FIG. 2B, an FW rotor 12 for storing electric energy is supported on a rotating shaft 11. Bearings 14 and 14 ′ that support the rotating shaft 11 in the radial direction and the axial direction are provided on the upper and lower portions of the rotating shaft 11. These bearings 14, 14 'are made up of rolling bearings, superconducting bearings, normal conducting magnetic bearings, etc., and support radial loads. The interior of the container (not shown) that houses the FW rotor 12 is evacuated to reduce windage loss due to rotation of the FW rotor 12.

[0006] The rotation shaft 11 on the lower surface of the FW rotor 2
Around the permanent magnet rotor (rotor) of a motor generator (used as both a motor and a generator) that takes in and out power energy
13 are provided. As shown in FIG. 2A, the permanent magnet rotor 13 has eight poles of permanent magnets arranged uniformly around the rotating shaft 11 alternately in N and S directions. A stator (stator) 15 of the motor generator is provided around the rotating shaft 11 below the permanent magnet rotor 13 so as to face the permanent magnet rotor 13 with a predetermined gap 16. The stator 15 is made of a coreless winding that does not use an iron core.

The other FW rotor 12 'has the same structure and faces the stator 15, so that the gap 16 generated by the repulsive magnetic force between the permanent magnet rotor 13 and the stator 15 on one side and the other on the other side. The permanent magnet rotor 13 ′ on the side and the gap 16 ′ generated by the repulsive magnetic force of the stator 15 are held in the same axial gap.

In the FW device having such a configuration, the motor generator acts as a motor, and the permanent magnet rotors 13 and 13 'are used.
Is rotated around the rotation axis 11, the FW rotor 1
Power is stored by the 2,12 'rotating at very high speed. Further, the stored electric power is output by the motor generator acting as a generator while the FW rotors 12, 12 'rotate. In this way, by using the permanent magnet rotor in the FW device, an excitation circuit for performing an electric / power generation operation becomes unnecessary. This eliminates the loss of the exciting current, so that power can be stored with high efficiency.

[0009]

However, in the power storage FW device having the axial gap type motor generator according to the above-described conventional configuration, the gap length in the axial direction is fixed regardless of the rotational speed. Causes several problems as follows.

First, the permanent magnet type generator has a problem caused by a change in induced voltage depending on the number of revolutions. That is, the induced voltage generated when the winding (not shown) of the stator 15 cuts off the magnetic flux of the permanent magnet rotor 13 is expressed by the following equation (1). E = 2.22fNkφ (1) where E: induced voltage, f: rotation speed (frequency), N: number of windings, k: winding coefficient, φ: magnetic flux

That is, as can be seen from equation (1), since the number of turns N of the winding of the stator 15 and the winding coefficient k and the magnetic flux φ of the permanent magnet rotors 13 and 13 'are constant values, the induced voltage E is It increases in proportion to the number f. Therefore, at the time of low-speed rotation, the motor is driven as an efficient motor generator, but at the time of high-speed rotation, a voltage higher than the voltage of the inverter driving the motor generator is generated by the motor generator. Therefore, during high-speed rotation, field-weakening control is performed to prevent such high-voltage power generation. Field-weakening control is control in which a current is generated so as to generate a magnetic flux in the opposite direction so that the magnetic flux acting on power generation does not increase. But,
When the field weakening current is caused to flow according to the insufficient voltage of the power converter (inverter) in this way, the reactive current increases, and the power factor deteriorates by the amount of the field weakening current. Therefore, as the field-weakening current increases due to the high-speed rotation, the loss due to the reactive current increases, and the power efficiency of the motor generator (therefore, the FW device) decreases.

Another problem is that motors or generators originally designed for high speed rotation have low output torque. That is, the output torque is given by the following equation (2).
Is represented by the following relational expression. T = 3E / ωI (2) where T: torque, ω = 2πf: electric angular frequency, I: current

That is, as described in the above equation (1), the induced voltage E increases as the frequency (rotational speed) f increases. It is set not to be higher than the maximum voltage that can be made. That is, the maximum induced voltage E is defined by the maximum voltage of the inverter and is a fixed value. Therefore, in the equation (2), the induced voltage E is constant even at high speed rotation, so that the torque T decreases as the frequency (rotation speed) f, that is, the electrical angular frequency ω increases. Thus, the output torque of the motor generator becomes smaller as the rotation speed increases. For example, 10,000
When rotating the FW device at about rpm, it cannot be rotated with a large driving torque.

The present invention has been made in view of such circumstances, and an object of the present invention is to prevent a high voltage from being generated during high-speed rotation without performing field-weakening control, and to provide a stable operation from low-speed rotation to high-speed rotation. It is another object of the present invention to provide a synchronous motor generator capable of generating an output torque as described above, and to provide a flywheel device for power storage using the synchronous motor generator.

[0015]

In order to solve the above problems and achieve the object, a synchronous motor generator according to the present invention comprises a rotor supported by a rotating shaft and having a permanent magnet around the rotating shaft. Position adjustment for moving the stator in a direction in which the gap of the axial gap is variable in a synchronous motor generator constituted by Means for adjusting the position of the stator according to the rotation speed of the rotor.

That is, according to the synchronous motor generator of the present invention, the position adjusting means changes the length of the gap of the axial gap between the rotor and the stator according to the rotation speed of the rotor. The amount of magnetic flux contributing to the motor-generator operation between the rotor and the stator can be automatically varied. Therefore, the induced voltage and the torque can be automatically changed according to the rotation speed. In particular, even when the field-weakening current is not controlled at the time of high-speed rotation, the generation of the high voltage can be automatically suppressed, so that the motor-generator operation can be effectively performed without lowering the power efficiency.

Further, in the synchronous motor generator according to the present invention, in the above invention, the position adjusting means moves the stator so as to shorten the gap of the axial gap when the rotor is rotating at a low speed lower than a predetermined rotation speed. When the rotor is rotating at a high speed higher than a predetermined number of rotations, the stator is moved so as to increase the axial gap.

That is, according to the synchronous motor generator of the present invention, at the time of low-speed rotation, the axial gap between the rotor and the stator is automatically narrowed to increase the amount of magnetic flux.
It can increase torque and generate high voltage.
Also, during high-speed rotation, the axial gap between the rotor and stator is automatically widened and the amount of magnetic flux is reduced, so the generated voltage is adjusted to a desired value without passing a weak field current. can do. Moreover, since no reactive current due to the field weakening current flows, the power factor can be improved and the power generation efficiency can be increased.

In the synchronous motor generator of the present invention, a stator can be formed by winding a coil around a core, but the coil may be wound without a core. By making the coreless, the eddy current loss and the iron loss due to the high-frequency current during high-speed rotation can be reduced. The winding method of the stator coil may be either concentrated winding or distributed winding. Further, the motor configuration including the rotor and the stator arranged with the axial gap provided therebetween may be configured by a plurality of stages. That is, the axial gap motor may have a single-stage configuration, or may have a multi-stage configuration. Further, the permanent magnet arranged on the rotor is constituted by an arbitrary number of even poles having two or more poles, and may be constituted by two poles, six poles, eight poles, and so on, for example.

The axial gap type synchronous motor generator according to the present invention can be used for a power storage flywheel device. Alternatively, the gap may be adjusted by a position adjuster to generate an optimum voltage when the rotation speed changes according to the wind speed, using a wind turbine generator. Furthermore, it is also possible to use a wheel-in motor generator for an electric vehicle or a motor generator using a battery as a power source to adjust a gap by a position adjuster according to an input voltage to generate an optimum voltage. it can. Alternatively, it can be used for a high-speed generator directly connected to a micro gas turbine.

The present invention is also an invention of a power storage flywheel device using an axial gap type synchronous motor generator. That is, in a power storage flywheel device that stores power by rotating a rotating disk supported by a rotating shaft by an electric motor, a rotor of the electric motor including a first permanent magnet disposed around the rotating shaft of the rotating disk. And a stator of the electric motor arranged with an axial gap parallel to the rotating shaft facing the first permanent magnet, a bearing for supporting a radial load, and a second stator arranged on the other surface of the turntable. And a superconducting magnet arranged so as to have a predetermined gap in the direction of the rotation axis facing the second permanent magnet in order to magnetically levitate the rotating disk, and fixed in a direction in which the gap of the axial gap is variable And a position adjusting means for moving the stator, wherein the position adjusting means is configured to change the position of the stator according to the rotation speed of the turntable. It is a Eel apparatus.

That is, according to the flywheel device for power storage of the present invention, since the axial gap type motor generator is used, no magnetic attraction force is generated in the radial direction even if the rotating shaft of the rotating disk is eccentric. Further, since the total length of the rotating shaft can be reduced as compared with the case where a radial gap type motor generator is used, problems of shaft vibration and shaft rigidity during high-speed rotation can be reduced. Further, by positioning the axial gap type motor generator above the rotating shaft, the thrust load can be supplemented by the magnetic attraction force of the motor generator. That is, the problems of shaft eccentricity, shaft vibration, and shaft rigidity can be reduced, and the thrust load can be compensated. In addition, the power storage flywheel device of the present invention includes the position adjusting means for moving the stator in a direction in which the axial gap between the stator and the rotor is changed. And
Since the position adjusting means changes the position of the stator according to the rotation speed of the rotating body, the induced voltage and torque can be automatically changed according to the rotation speed. In particular, since the generation of a high voltage can be automatically suppressed without controlling the field weakening current at the time of high-speed rotation, the motor-generator operation can be performed effectively without lowering the power efficiency. .

Further, the present invention is characterized in that, in the power storage flywheel device of the invention, the stator is coreless and the coil is wound. That is, by making the stator of the motor a coreless type having no iron core, iron loss and eddy current loss can be reduced, so that the efficiency of the motor generator can be further improved.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a synchronous motor generator according to the present invention will be described with reference to the drawings. As a specific example, a flywheel device for power storage using this synchronous motor generator will be described. . FIG. 1 is a side sectional view showing a configuration of a power storage FW device according to an embodiment of the present invention. This FW device shows a state to which an axial gap type motor generator is applied. The FW device is used with the rotating shaft 1 standing upright in a state as shown in the figure.

First, the overall configuration will be described. Figure 1
In the FW device, a FW rotor 2 that stores electric power energy with respect to a rotating shaft 1 is supported. In addition, bearings 3 and 3 ′ that support the radial direction and the axial direction of the rotating shaft 1 are provided at an upper portion and a lower portion of the rotating shaft 1.
These bearings 3, 3 'are composed of rolling bearings, superconducting bearings, normal conducting magnetic bearings, etc., and support radial loads.
The interior of the container (not shown) that accommodates the FW rotor 2 is evacuated.

A rotor (rotor) 4 of a motor generator (both an electric motor and a generator) for taking in and out electric energy is provided around the rotating shaft 1 on the upper surface of the FW rotor 2. Further, a stator (stator) 5 of the motor generator is provided around the rotation shaft 1 above the rotor 4 so as to face the rotor 4 with a predetermined gap g. The stator 5 is made of a coreless winding that does not use an iron core. The rotor 4 is supported by the short-circuit core 6, and the stator 5 is held by the short-circuit core 6 '.

On the lower surface of the FW rotor 2, a permanent magnet 7 is provided around the rotating shaft 1. Further, the rotating shaft 1 is opposed to the permanent magnet 7 with a predetermined gap g ′.
Is provided with a superconducting magnet 8. When the permanent magnet 7 and the superconducting magnet 8 magnetically repel, the FW
The rotor 2 is levitated from the superconducting magnet 8. That is, the repulsive magnetic force of the permanent magnet 7 and the superconducting magnet 8 supports the thrust load from above.

In this FW device, the motor generator having the above-described structure acts as a motor, so that the FW rotor 2 rotates at a very high speed as the rotor 4 rotates around the rotation shaft 1, and thus the electric power is generated. Is stored. Further, the stored electric power is output by the motor generator acting as a generator while the FW rotor 2 is rotating.

Further, in this FW device, in order to increase the storage efficiency of the FW rotor 2 rotating at a very high speed, the FW rotor 2 is evacuated by evacuating the inside of the container (not shown).
The inside of the apparatus is kept in a vacuum state to reduce windage loss caused by rotation of the FW rotor 2. Furthermore, in order to reduce the windage loss due to the rotation of the FW rotor 2 and maintain the cooling effect of the FW rotor 2, the pressure inside the FW device is reduced by reducing the pressure inside the container (not shown) that houses the FW rotor 2. I have.

Although not shown, a gas having a low molecular weight such as helium may be filled in the container for housing the FW rotor 2. Further, a cooling device may be provided to cool the gas in the container. Alternatively, a vacuum pump is provided to evacuate the inside of the container, and then, when the FW rotor 2 generates heat during charging and discharging, a gas for cooling the FW rotor 2 is injected into the container by a cooling device. May be.

Further, a feature of the FW device according to the present invention is that the position adjuster 9 is provided above the stator 5.
To be precise, it is configured to be mounted on the upper part of the short-circuit core 6 ′ holding the stator 5. In this position adjusting device 9, as shown in the figure, a fixing member 9a is fixed to the short-circuit core 6 ', and a support bar 9b with a rack 9c is extended upward from the fixing member 9a. That is, the support rod 9b has a shape in which a ball screw is formed. Further, a pinion 9e with an exposed adjusting portion is provided in the case 9d.
Are screwed into the rack 9c. In other words, by rotating the pinion 9c, the drive direction is changed and decelerated by the rack 9c, so that the support bar 9b moves up and down. For example, one rotation of the pinion 9c causes the screws of the rack 9c to move one pitch.

When the pinion 9e rotates according to the rotation speed of the FW rotor 2 by the position adjuster 9 configured as described above, the rack 9c of the support rod 9b advances by a pitch, and the short-circuit fixed to the fixing member 9a. Stator 5 with core 6 '
Moves up and down. Thereby, the rotor 4 and the stator 5
Of the gap g in the axial direction can be variably adjusted. In other words, the position adjuster 9 can change the length of the axial gap g between the rotor 4 and the stator 5. For example, at the time of high-speed rotation, the gap g is operated so as to increase, and the same action as that of the field weakening control is performed.

In the FW device configured as described above,
When the FW rotor 2 is rotating at a low speed, the pinion 9e rotates in a desired direction to screw the rack 9c and move the support rod 9b downward by a speed signal from a rotation speed detector (not shown). . Thereby, the stator 5
Moves downward to shorten the gap g. Then, the magnetic flux φ between the rotor 4 and the stator 5 increases,
As is clear from the above equation (1), the induced voltage E increases. Further, as can be seen from the above equation (2), the torque T also increases as the induced voltage E increases. In this way, at the time of low-speed rotation, the torque can be increased by automatically reducing the gap g,
An induced voltage having a desired voltage value can be generated.

Next, when the FW rotor 2 is rotated at a high speed, the pinion 9e is rotated in a desired direction by a speed signal from a rotation speed detector (not shown), and the rack 9c is screwed and moved. 9b is moved upward. As a result, the stator 5 moves upward to lengthen the gap g. Then, the magnetic flux φ between the rotor 4 and the stator 5 decreases, and the induced voltage E decreases. That is, during high-speed rotation, the induced voltage is automatically reduced to a desired value and a desired torque is generated by reducing the magnetic flux φ without flowing the field weakening current as described in the above-described related art. You can also. In this manner, at the time of high-speed rotation, by automatically increasing the gap g, the occurrence of an excessive induced voltage is prevented, and since the field-weakening current does not flow, the power efficiency is not reduced.

Since the adjustment of the gap g by the position adjuster 9 is about 1 to 2 mm, the mechanism of the rack and the pinion has a structure in which there is no play in the threaded portion, and the pitch interval between the ball screws is about several tens of microns. It must be:
Of course, the mechanism is not limited to the rack and pinion mechanism, and any mechanism may be used as long as it can move the stator up and down with an accuracy of several microns to several tens of microns.

In the above embodiment, the case where the gap g is adjusted by moving the stator 5 up and down has been described.
Even if only the short-circuit core 6 ′ is moved up and down by the position adjuster 9, the magnetic flux φ can be increased or decreased, and the same operation and effect as in the above embodiment can be exhibited. However, in this case, it is necessary to consider the cooling effect of the stator 5.

Further, in the embodiment of the FW device according to the present invention shown in FIG. 1, the stator 5 is constituted by a coreless having no iron core, but this reduces eddy current loss and iron loss due to high-frequency current during high-speed rotation. That's why. However, it goes without saying that the present invention can be applied even when a stator with a core is used. In addition, the winding method of the stator coil is concentrated winding,
Any of distributed winding may be used. Further, in FIG. 1, the axial gap motor is constituted by a single-stage motor.
The present invention can also be applied to a multi-stage axial gap motor in which the rotor 2, the short-circuit core 6, the rotor 4, the stator 5, and the short-circuit core 6 'are combined. The configuration of the rotor 4 in FIG.
The permanent magnet as shown in (a) is not limited to the one having eight poles, but may have two poles, six poles, and so on.

Although the increase / decrease of the magnetic flux φ due to the adjustment of the axial gap is not directly related to the above, the FW apparatus for storing electric power configured as described above uses the axial gap type motor generator, so Even if the rotating shaft 1 of the rotor 2 is eccentric, no magnetic attraction is generated in the radial direction.
Therefore, the radial load can be significantly reduced as compared with the case where the radial gap type motor generator is used. Further, when the rotating shaft 1 is eccentric, self-alignment in the radial direction occurs due to the strength of magnetic energy generated by the motor generator, so that the radial load can be further reduced.

The axial gap motor generator can reduce the total length of the rotary shaft 1 of the FW rotor 2 as compared with the case of using the conventional radial gap motor generator. The shaft vibration during rotation can be reduced, and the possibility of breakage due to rigidity can be reduced. Further, by positioning the axial gap type motor generator above the rotating shaft 1, the permanent magnet 7
The thrust load supported only by the magnetic force of the superconducting magnet 8 can be supplemented by the magnetic attraction force of the motor generator. Alternatively, by adjusting the strength of the magnetic attraction force, the floating gap length of the FW rotor 2 from the superconducting magnet 8 can be adjusted. The superconducting magnet 8 may be a permanent magnet. Further, the thrust load can be supported only by the bearings 3 and 3 ′ instead of being supported by the magnetic force of the permanent magnet 7 and the superconducting magnet 8 for floating the FW rotor 2.

By using a permanent magnet type motor generator, copper loss and iron loss can be reduced, and the necessity of cooling the FW rotor 2 in a vacuum can be reduced. further,
By making the stator 5 of the motor generator a coreless type having no iron core, iron loss can be further reduced, and the power efficiency of the motor generator can be further improved. Also,
In conventional radial gap type motor generators, when rotating at high speed, centrifugal force is applied to the gap that generates the force, so the trade-off between the problem of preventing scattering of magnets and the like and the problem of electromagnetic optimality As a result, there is a restriction for obtaining an optimum structure. However, the axial gap type motor generator of the present invention can separately design the gap surface in the thrust direction that generates the force and the strength support surface in the radial direction that receives the centrifugal force. Separately, it is possible to design with ultra-high speed and high output.

The embodiment described above is an example for explaining the present invention, and the present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the invention. is there. For example, in the above-described embodiment, a case has been described in which the axial gap type synchronous motor generator is applied to the power storage flywheel device.However, the present invention is not limited to this, and may be applied to, for example, a wind turbine generator. When the rotation speed changes due to the wind speed, the gap may be adjusted by the position adjuster to generate an optimum voltage. Alternatively, the present invention is applied to a wheel-in motor generator for an electric vehicle, a motor generator using a battery as a power source, and the like, and a gap is adjusted by a position adjuster according to an input voltage to generate an optimum voltage. Can also. Alternatively, the present invention can be applied to a high-speed generator directly connected to a micro gas turbine.

[0042]

As described above, according to the axial gap type synchronous motor generator of the present invention, at low speed rotation, the axial gap between the rotor and the stator is automatically narrowed and the magnetic flux is increased. Therefore, it is possible to increase the torque or generate a high voltage. Also, during high-speed rotation, the axial gap between the rotor and the stator is automatically widened and the magnetic flux is reduced, so that the generated voltage can be adjusted to a desired value without passing a field weakening current. it can. Moreover, since no reactive current due to the field weakening current flows, the power factor can be improved and the power generation efficiency can be increased.

[Brief description of the drawings]

FIG. 1 is a power storage FW according to an embodiment of the present invention.
FIG. 2 is a side sectional view showing the configuration of the device.

FIGS. 2A and 2B are image structure diagrams when an axial gap type motor generator according to a conventional technique is applied to a FW device, wherein FIG. 2A is a top view of a permanent magnet rotor, and FIG.
It is sectional drawing of an apparatus.

[Explanation of symbols]

 Reference Signs List 1 rotating shaft 2 FW rotor 3, 3 'bearing 4 rotor 5 stator 6, 6' short-circuit core 7 permanent magnet 8 superconducting magnet 9 position adjuster 9a fixing member 9b support rod 9c rack 9d case 9e pinion g, g 'gap

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayuki Morimoto 1st Takamichi, Iwazuka-cho, Nakamura-ku, Nagoya-shi, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Industrial Equipment Division (72) Inventor Hiroshi Kawashima 2-chome, Araimachi, Takarai City, Hyogo 1-1 1-1 Mitsubishi Heavy Industries, Ltd. Takasago Plant (72) Inventor Masaharu Minami 2-1-1, Araimachi, Takasago-shi, Hyogo Prefecture Mitsubishi Heavy Industries, Ltd. Takasago Research Laboratory (72) Inventor Shigeo Nagaya Midori-ku, Nagoya-shi, Aichi Prefecture 20-1 Kita-Sanzan, Otaka-cho, Chubu Electric Power Co., Inc. (72) Inventor Naoji Kashima 20-1, Kita-Sekiyama, Odaka-cho, Midori-ku, Nagoya-shi, Aichi, Japan Chubu Electric Power Co., Inc. F term (reference) 5H604 BB01 BB03 BB13 CC01 CC04 CC20 5H607 AA12 AA14 BB01 BB02 BB07 BB13 BB21 BB23 BB25 CC01 CC05 DD01 DD14 EE41 E E42 EE54 FF21 FF24 FF26 FF33 GG02 GG09 GG19 GG23 5H621 AA03 BB01 BB02 BB06 BB07 HH01 JK13 JK17 PP02 5H622 AA03 CA02 CA10 CB01 PP03

Claims (12)

[Claims] 1. A rotor supported by a rotating shaft and provided with a permanent magnet around the rotating shaft, and a stator opposed to the permanent magnet and provided with an axial gap parallel to the rotating shaft. And a position adjusting means for moving the stator in a direction in which a gap of the axial gap is varied, wherein the position adjusting means fixes the fixed member in accordance with a rotation speed of the rotor. A synchronous motor generator configured to change a position of a child. 2. The position adjusting means moves the stator so as to shorten the gap of the axial gap when the rotor is rotating at a low speed lower than a predetermined number of rotations. 2. The synchronous motor generator according to claim 1, wherein at a high-speed rotation faster than a number, the stator is moved so as to lengthen the gap of the axial gap. 3. 3. The synchronous motor generator according to claim 1, wherein the stator has a coil wound around a core. 4. The synchronous motor generator according to claim 1, wherein the stator has a coreless coil wound. 5. The synchronous motor generator according to claim 3, wherein the coil is wound in one of concentrated winding and distributed winding. 6. The motor configuration according to claim 1, wherein the rotor and the stator arranged with the axial gap are provided in a plurality of stages. Synchronous motor-generator according to 1. 7. A permanent magnet provided in the rotor,
The synchronous motor generator according to any one of claims 1 to 6, wherein the synchronous motor generator is configured with an arbitrary number of even poles equal to or more than the pole. 8. The method according to claim 1, which is used for any of a wind turbine type generator, a flywheel type motor generator, a motor generator for an electric vehicle, a motor generator using a battery as a power source, and a micro gas turbine type generator. The synchronous motor generator according to claim 7. 9. An electric power storage flywheel device for storing electric power by rotating a rotating disk supported by a rotating shaft with an electric motor, wherein a first permanent magnet arranged around the rotating shaft of the rotating disk is provided. A rotor of the electric motor, a stator of the electric motor arranged so as to be opposed to the first permanent magnet and having an axial gap parallel to the rotation axis, a bearing for supporting a radial load, A second permanent magnet disposed on the other surface of the disk; and a superconducting electrode disposed to face the second permanent magnet and to have a predetermined gap in the direction of the rotation axis in order to magnetically levitate the rotating disk. A magnet, and position adjusting means for moving the stator in a direction in which the gap of the axial gap is varied, wherein the position adjusting means adjusts a position of the stator in accordance with a rotation speed of the turntable. Position energy storage flywheel apparatus characterized by being configured to vary the. 10. The power storage flywheel device according to claim 9, wherein the stator is coreless and a coil is wound. 11. The power storage flywheel device according to claim 9, wherein the superconducting magnet is a permanent magnet. 12. The power storage flywheel device according to claim 9, wherein the stator has a coreless coil wound thereon, and the superconducting magnet is a permanent magnet.