Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1983-07-21
1985-07-30
Budd, Mark O.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 68R, 310 49R, 336123, 336131, H02K 1600
Patent
active
045324476
DESCRIPTION:
BRIEF SUMMARY
The invention relates to rotary electric machines.
Rotary electric machines are already known forming a speed variator (Electron-Auxilec sold in France by the Thomson-Lucas company). The variation of speed is obtained therein by slipping with a substantially constant torque. Although capable of giving reliable service, these machines have the disadvantage of poor efficiency, at best equal to N.sub.2 /N.sub.1, N.sub.1 being the input speed and N.sub.2 the output speed.
The invention has more particularly as aim to provide a torque converter at the same time as a speed variator with an efficiency very much greater than that of the previously mentioned machines, more especially at high reduction ratios. It proposes, to this end, a machine comprising, in combination:
a stator F with s pole pairs,
a central rotor RM with p pole pairs,
an intermediate rotor RT comprising two series of axial notches, namely a series of inner notches in each of which passes at least one primary conductor subjected to the rotor field RM and a series of external notches in each of which passes at least one secondary conductor subjected to the stator field F, and
an electric circuit providing the connection between the primary conductors and the secondary conductors, this circuit comprising at least one switching device controlling the passage through the secondary conductors of the current induced in the primary conductors, in a direction such that the torque exerted by stator F on rotor RT is in the same direction, in general in the direction of the torque exerted by the central rotor RM on the intermediate rotor RT.
In a first embodiment of the invention, the intermediate rotor comprises two pairs of notches, each pair of which is formed, on the same radius, by an internal notch on the rotor RM side and an external notch on the stator F side. Each pair of notches houses a winding whose external strands are intended to be subjected to the stator F field and whose internal strands are intended to be subjected to the field of the central rotor RM. Each winding is closed by a switching device comprising at least two unidirectional conducting switches, mounted on the intermediate rotor so as to let the current pass respectively in one direction or the other in the winding, and this in a controlled way as a function of the direction of the stator field to which the winding is subjected.
In this case, the number s of stator poles is 3,4 or 6, the central rotor comprises p=6 to 10 pole pairs and the intermediate rotor comprises q pairs of notches, q being advantageously a multiple of the number of poles, i.e. 2p, for example 3.times.2.times.p.
In another embodiment of the invention, the inner and outer notches of the intermediate rotor are respectively provided with separate inner and outer windings.
In this case, the inner winding of the intermediate rotor RT may be wound in the manner of a conventional three-phase winding, whereas the outer winding may comprise several circuits each comprising in series several coils in phase with respect to the poles of the stator. The three-phase current, generated inside the three-phase winding, may be rectified then transmitted to the coils of the outer winding through a switching device controlled as a function of the position of the intermediate rotor with respect to the stator.
In the previously described embodiments, the switching device may consist of unidirectional control switches able to be controlled by a current of low strength, such as transistors or thyristors. The control of these switches may be accomplished from a sensor detecting the position of the rotor RT, with respect to stator F, or to the field resulting from the coils energizing the stator F and the armature reaction produced in the intermediate rotor RT. Hall effect components may be advantageously used for this purpose.
Moreover, according to one advantageous aspect of the invention, stator F arranged as a DC motor stator with parallel energization comprises projecting poles and the central rotor RM, arranged as a motor vehi
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patent: 2762939 (1956-09-01), Hodgson
patent: 2864017 (1958-12-01), Waltscheft
patent: 2903641 (1959-09-01), Roe
patent: 3683249 (1972-08-01), Shibata
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