Motor/generator

Details Motor/generator Motor/generator

1999-03-25

2001-03-13

Martin, David (Department: 2837)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S261100, C310S266000, C318S148000, C318S153000, C318S801000, C318S811000, C318S432000

Reexamination Certificate

active

06201331

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to the structure of a motor/generator.
BACKGROUND OF THE INVENTION
Tokkai Hei 8-340663 published by the Japanese Patent Office in 1996 discloses a motor/generator comprising two rotors and one stator coaxially arranged in three layers wherein one of the rotors is driven as a motor and the other is driven as a generator.
In this motor/generator, wo sets of coils are installed in the stator for providing a magnetic field for respective rotors, and two sets of inverters, i.e., current controllers, are provided for controlling respective sets of coils.
SUMMARY OF THE INVENTION
However, in the case of this motor/generator, since two sets of coils and inverters are required, current losses such as copper losses or switching losses are large.
It is therefore an object of this invention to reduce current losses of a motor/generator having the construction described in the prior art.
In order to achieve the above object, this invention provides a motor/generator comprising a first rotor comprising plural magnetic poles and supported free to rotate, a second rotor comprising plural magnetic poles and supported free to rotate coaxially with the first rotor, a stator fixed co-axially with the first rotor, and a coil unit comprising plural coils disposed at equal angular intervals on the stator, wherein the coil unit forms plural rotating magnetic fields of equal number to the number of magnetic poles of the first rotor according to a first alternating current and forms plural rotating magnetic fields of equal number to the number of magnetic poles of the second rotor according to a second alternating current.
The motor/generator further comprises an electrical circuit for supplying a composite electrical current comprising the first alternating current and the second alternating current to the coil unit, and a circuit for compensating a torque fluctuation produced in either of the two rotors due to the non -uniformity of the magnetic field accompanying the relative rotation of the first rotor and second rotor.
The details as well as other features and advantages of this invention are set forth in the remainder of the specification and are shown in the accompanying drawings.


REFERENCES:
patent: 396355 (1889-01-01), Dyer
patent: 2666174 (1954-01-01), Pestarini
patent: 4087698 (1978-05-01), Myers
patent: 4407132 (1983-10-01), Kawakatsu et al.
patent: 4453447 (1984-06-01), Shinneman
patent: 4866321 (1989-09-01), Blanchard et al.
patent: 5184040 (1993-02-01), Lim
patent: 5311092 (1994-05-01), Fisher
patent: 5444341 (1995-08-01), Kneifel, II et al.
patent: 5495131 (1996-02-01), Goldie et al.
patent: 5554915 (1996-09-01), Wedeen et al.
patent: 5594322 (1997-01-01), Rozman et al.
patent: 5744895 (1998-04-01), Seguchi et al.
patent: 5783894 (1998-07-01), Wither
patent: 5793136 (1998-08-01), Redzic
patent: 8-340663 (1996-12-01), None

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