Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-03-25
2001-04-03
Enad, Elvin (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S114000, C310S254100, C310S261100, C310S266000
Reexamination Certificate
active
06211597
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, two, 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 series of coils and inverters are required, there is a problem in that current losses such as copper loss and switching loss, are large.
It is therefore an object of this invention to reduce current losses of such a three-layered motor/generator as described in the prior art.
It is another object of this invention to simplify the construction and reduce the number of parts of such a motor/generator.
In order to achieve the above objects, 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.
The coil unit is arranged so as to form plural rotating magnetic fields of equal number to the number of magnetic poles of the first rotor according to a first alternating current and to form plural rotating magnetic fields of equal number to the number of magnetic poles of the second rotor according to a second alternating current.
The coil unit comprises first salient poles facing the first rotor and second salient poles facing the second rotor, wherein the ratio of the first salient poles and second salient poles is set equal to the ratio of a magnetic pole number of the first rotor and a magnetic pole number of the second rotor.
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.
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: 4731554 (1988-03-01), Hall et al.
patent: 5117141 (1992-05-01), Hawsey et al.
patent: 5554903 (1996-09-01), Takara
patent: 5783894 (1998-07-01), Wither
patent: 5864198 (1999-01-01), Pinkerton
patent: 8-340663 (1996-12-01), None
Enad Elvin
Foley & Lardner
Nissan Motor Co,. Ltd.
LandOfFree
Motor/generator with multiple rotors does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Motor/generator with multiple rotors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Motor/generator with multiple rotors will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2503883