Electricity: single generator systems – With flywheels or massive moving parts
Patent
1993-12-16
1996-07-30
Stephan, Steven L.
Electricity: single generator systems
With flywheels or massive moving parts
290 1R, 290 49, H02K 702
Patent
active
055414974
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a power storing apparatus for storing electric power by a form of kinetic energy.
BACKGROUND ART
Studies have conventionally been made of a power storing apparatus for storing electric power by a form of kinetic energy.
Such a power storing apparatus is composed of a rotor having flywheels around the rotary shaft, a stator provided with a coil for supplying a driving power for rotating the rotor and taking out the induction electromotive force generated by the rotation of the rotor, a bearing means for rotatably supporting the rotary shaft of the rotor, and a casing accommodating the stator, the bearing and the rotor. This type of conventional power storing apparatus has a low earthquake resistance, because it is designed without leaving a surplus strength in order to reduce the friction loss of the bearing. Especially, in a bearing employing the pinning effect of a type II superconductor, rigidity is subject to a gradient of a magnetic field and therefore low. For example, it is rocked about 1 to 2 mm due to a burden corresponding to the weight of a rotor. In order to prevent the elements of the power storing apparatus from scattering at the time of an accident, the apparatus is often accommodated in a firm container.
There has also been an attempt at supporting the casing on the ground by an elastic member having a low spring constant in order to prevent vibration, which is caused by an earthquake or the like and which may dislocate the rotor, from being transmitted from the ground to the casing.
PROBLEMS TO BE SOLVED BY THE INVENTION
If the casing is supported by an elastic member having a low spring constant, as described above, then the counterforce of the rotation of the rotor which acts on the casing rocks the rotor, thereby making it difficult to support the rotor stably.
OBJECT OF THE INVENTION
Accordingly, it is an object of the present invention to eliminate the above-described problems in the related art and to provide a power storing apparatus which enables the casing to be supported on the ground with elasticity and without a fear of being rocked due to the rotation of the rotor.
DISCLOSURE OF THE INVENTION
To achieve this aim, the present invention provides a power storing apparatus comprising: a plurality of rotors each including flywheels for maintaining the rotation of the rotor by the inertia force; and an electric circuit for increasing or reducing the number of revolutions of each rotor so as to rotate the rotors in the opposite directions to each other by the same rotational frequency, wherein at least one pair of rotors is installed on the ground together with the corresponding bearings and casings through buffer devices.
According to a power storing apparatus of the present invention, since the number of rotations of one pair of rotors is controlled to be constantly equal within plus or minus 1%, the torques as a counterforce for fluctuating the input or the output cancel each other, so that the power storing apparatus is prevented from rocking. In addition, since the power storing apparatus is supported on the ground by a soft spring so that the natural or characteristic frequency of the apparatus is not more than 0.3, the force transmitted from the ground to the apparatus at the time of an earthquake is reduced to not more than 1/10.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows the structure of a characteristic part of a first embodiment of a power storing apparatus according to the present invention;
FIG. 2 is a sectional view of the structure of one casing of the first embodiment shown in FIG. 1;
FIG. 3 is an explanatory view of the first embodiment which is installed on the ground;
FIG. 4 is an explanatory view of the lower part of the supporting means of the first embodiment with air springs disposed therein;
FIG. 5 is an explanatory view of the casings arranged in the block of the first embodiment;
FIG. 6 is a sectional view of a second embodiment of a power storing apparatus according to the present invention
REFERENCES:
patent: 3970917 (1976-07-01), Diggs
patent: 4322623 (1982-03-01), Grady
patent: 4723735 (1988-02-01), Eisenhaure et al.
patent: 4725766 (1988-02-01), Pinson
patent: 4926107 (1990-05-01), Pinson
patent: 5245270 (1993-09-01), Akiyama
Yotsuya, Tsutom, Motoaki Shibayama and Ryoichi Takahata, "Characterization of High-Temperature Superconducting Bearing." Advances in Cryogenic Engineering 37 (1991): 1-6.
Kabushiki Kaisha Shikoku Sogo Kenkyujo
Ponomarenko Nicholas
Shikoku Denryoku Kabushiki Kaisha
Stephan Steven L.
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