Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1996-07-05
1998-02-17
LaBalle, Clayton E.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 80, 310 81, 310 82, 310261, H02K 3700, H21K 800
Patent
active
057194580
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a power converter including a stator and a rotor, wherein the stator is composed of an electromagnet for generating a rotating magnetic field by an alternating current and the rotor is composed of a permanent magnet combined with a magnetic body made of a mild steel or the like. In particular, the present invention concerns a power generator which is similar in basic structure to a synchronous motor and has an excellent energy efficiency represented by an input-output ratio of energy, is made compact, and is rotated in synchronization with a rotating magnetic field like a synchronous motor, thereby providing a rotating torque proportional to intensities of a rotating magnetic field of the electromagnet and a magnetic field of the permanent magnet.
BACKGROUND ART
A known induction motor includes a stator and a rotor, wherein the stator is composed of an electromagnet for generating a rotating magnetic field by an alternating current and the rotor is composed of a solid core or a squirrel-cage rotor, thereby generating a torque by electromagnetic induction. In this induction motor, it is relatively easy to reach an energy efficiency represented by an input-output ratio of energy of about 80%, but it is very difficult to exceed 80% because of the effect of copper losses.
A permanent magnet type synchronous motor also has been known, in which a rotor is composed of a permanent magnet. In such a synchronous motor, a rotating magnetic field generated by an alternating current applied to an electromagnet constituting a stator attracts and rotates the permanent magnet constituting the rotor, and thereby a rotating torque is proportional to intensities of a rotating magnetic field and a magnetic field of the permanent magnet. The permanent magnet type synchronous motor, however, is difficult to self-start, and accordingly it has a squirrel-cage rotor for accelerating the rotor on the basis of the principle of the induction motor. In other words, the synchronous motor of this type has a combined structure of two motors (permanent magnet motor and induction motor), leading to a problem in that the structure is enlarged in size.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a power generator with a compact structure, which is excellent in energy efficiency and is capable of generating a high rotating torque.
To achieve the above object, according to a preferred mode of the present invention, there is provided a power generator for converting a magnetic energy into a motive power, comprising: current applied to a coil of the electromagnet, the electromagnet being fixed on a supporting member; such a manner as to be positioned in the rotating magnetic field; manner that a polarity of the permanent magnet is reverse to that of the rotating magnet field, the permanent magnet being rotated together with the rotation output shaft; and such a manner as to be rotated together with the rotation output shaft; bodies, and when the electromagnet is excited, the magnetic flux is rotated together with the rotating magnetic field while being converged on a side of the rotating magnetic field, whereby the rotation output shaft receives a rotating torque.
According to the above-described power generator of the present invention, the magnetic flux, passing through the magnetic bodies, of the permanent magnet spreads over the entire magnetic bodies when no alternating current is applied to the electromagnet. However, when a rotating magnetic field is generated by an alternating current applied to the electromagnet, the magnetic flux is converged on the rotating magnetic field side, to generate an initial torque. As a result, the rotor (magnetic bodies and permanent magnet) instantly comes to a synchronous state, and is transferred to synchronous operation, that is, to operation by a rotating torque generated depending an a load angle .theta. between magnetic axes of the rotating magnetic field and the rotor.
The power generator of the present invention h
REFERENCES:
patent: 3676764 (1972-07-01), Syverson
patent: 3849213 (1974-11-01), Baermann
patent: 3898599 (1975-08-01), Reid et al.
patent: 4404484 (1983-09-01), Gillott
patent: 4565938 (1986-01-01), Fawzy
patent: 4749933 (1988-06-01), Ben-Aaron
patent: 5030866 (1991-07-01), Kawai
patent: 5292284 (1994-03-01), Denk et al.
LaBalle Clayton E.
Nguyen Tran N.
Nihon Riken Co., Ltd.
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