Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-11-12
2001-07-03
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S180000, C310S186000, C310S190000, C310S216006, C310S268000
Reexamination Certificate
active
06255753
ABSTRACT:
The present invention relates to electro magnetic machines. In particular the present invention relates to axial flux electro magnetic machines.
In Australian patent number 668251 an electro magnetic machine is disclosed including the use of at least one pair of axially spaced apart electro magnetic stator coils on opposite sides of a rotor, the axis of each electro magnetic stator coil being spaced from and substantially transverse to the axis of the rotor and said rotor arranged to pass between said electro magnetic stator coils, said electromagnetic stator coils being connected, in series, to axially spaced part fixed solenoids disposed on opposite sides of said rotor magnetic poles, the axis of each said fixed solenoid being substantially transverse to a radius of said rotor. A composite magnetic field force is created around said electro magnetic stator coils, said fixed solenoids and rotor magnetic poles, such that said composite magnetic field is biased to the point of rotation of said rotor.
However, this specification does not contemplate the problem arising from overlapping magnetic field between each solenoid and rotor magnetic pole. The overlapping of magnetic field along the plane of rotation of the rotor produces resistance to rotation of the rotor and thus decreased efficiency of the machine. This problem is discussed in more detail below.
The present invention seeks to overcome the above mentioned problem.
In accordance with one aspect of the present invention there is provided an electro magnetic rotating machine comprising at least:
a rotor having at least one magnet creating rotor magnetic poles; and
at least one pair of axially spaced part solenoids disposed on opposite sides of the rotor magnetic poles, the axis of each solenoid is arranged to be transverse a radius of the path of rotation of the rotor, wherein the solenoids are configured to minimise overlapping of magnetic flux between at least one of the rotor magnetic poles and one of the solenoids when said magnetic pole is adjacent to said solenoid.
Preferably, each of the solenoids has substantially the same peripheral shape in cross-section as the magnets, whereby the magnetic flux created by the solenoid and rotor magnetic pole has minimal overlap when they are aligned.
Preferably, when the electro magnetic rotating machine operates as a motor, the solenoids are excited by an external power source, thereby creating a magnetic field that causes the rotor magnetic poles to rotate.
More preferably, the electro magnetic rotating machine includes bias means for providing a directionally biased magnetic field for biasing the rotor to rotate in a predetermined direction.
Still more preferably, the bias means is in the form of at least one pair of axially spaced apart induction coils disposed on opposite sides of the rotor magnetic poles, the axis of each induction coil is arranged to be transverse the axis of rotation of the rotor.
Preferably, when the electro magnetic rotating machine operates as a generator the rotor is rotated by an external means, thereby creating a dynamic magnetic field that generates electric current in the solenoids.
More preferably, the dynamic magnetic field generates additional electric current in at least one pair of axially spaced apart induction coils disposed on opposite sides of the rotor magnetic poles, the axis of each induction coil is arranged to be transverse the axis of rotation of the rotor.
Preferably, the electric current generated is an alternating current.
Preferably, the electro magnetic rotating machine operates as a motor and a generator, wherein a first set of solenoids are excited by an electricity generating means, thereby creating a magnetic field that causes the rotor to rotate, and the rotation of the rotor creates a rotating magnetic field that generates an electric current in a second set of solenoids as the rotating magnetic field passes each solenoid of the second set.
Preferably, the electro magnetic rotating machines includes a commutator axially coupled to the rotor, and the commutator is arranged to provide periodic completion of an electric circuit that provides, a pulse of direct electric current to the first set of solenoids during completion of the circuit.
Preferably, each solenoid is serially connected to a corresponding inductance coil.
Preferably, each serially connected solenoid and inductance coil are arranged to be adjacent each other so as to create a composite magnetic field.
Preferably, said solenoids are provided with a substantial number of conductor windings around a thin walled copper core.
REFERENCES:
patent: Re. 33628 (1991-07-01), Hahn
patent: 4629948 (1986-12-01), Tassinario
patent: 5179307 (1993-01-01), Porter
patent: 5334899 (1994-08-01), Skybyk
patent: 5786645 (1998-07-01), Obidniak
Carstens David W.
Carstens Yee & Cahoon, L.L.P.
Lam Thanh
Ramirez Nestor
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