Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1979-12-19
1982-05-11
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 80, H02K 706
Patent
active
043296076
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD AND POSSIBILITY OF INDUSTRIAL APPLICATION
The invention has for its object an alternating current motor of the synchronous type designed to have a particularly low rotor inertia and, at rest, a returning couple towards one amongst several positions of stable equilibrium, which makes it particularly suitable for cyclic services and for stepping function. The conception of this motor does not bring about any limitation so far as concerns its useful power. It can be constructed in such a manner as to turn slowly, without addition of an external speed reducer.
PRIOR ART
The French Pat. No. 1231097 filed Mar. 25th 1959 in the names of Claude Rosain and Georges Sterbatcheff for: "Alternating current slow speed motor" describes a motor of the synchronous type in which a small rotor inertia is obtained due to the fact that the rotor rolls without sliding on a rolling path fast with the stator and, because of this fact, does not undergo rapid rotation about its own axis. This motor thus only permits the obtaining of movements which are slow with respect to the pulsing of the rotating field and moreover poses, because of the vibrations generated by the hypocycloidal movement, difficult problems of suspension.
The magnetic circuit of its stator necessarily has the feature of being arranged so that the rotating field shall be dephased by 180.degree. between the two gaps comprised in the respective extremities of the rotor, which distinguishes its construction from that of traditional magnetic circuits. Finally the balancing of such a motor can only be obtained at the price of artifices which complicate construction.
DISCLOSURE OF THE INVENTION
The invention proposes to free itself from these inconveniences by using a stator magnetic circuit of the traditional type producing a field rotating in the same direction at both extremities of the rotor, and by maintaining, by means of at least one element eccentric with respect to the shaft of the motor, a constant inclination of the axis of the rotor with respect to that of the stator, so that the rotor carries out a conical movement.
As a result of this conical movement there is obtained a particularly low rotor inertia and, taking into account the fact that the magnetic circuit further has a symmetry of revolution, the motor has several positions defining a minimum gap and consequently a stable equilibrium.
The motor in accordance with the invention thus comprises a rotor and a stator defining between them a gap at each end, each having an axis of revolution and a common centre of symmetry at the intersection of these two axes, a stator winding fed and arranged to generate a field rotating in the same direction in the two gaps and means for polarising magnetically, with opposite polarities, the two extremities of the rotor, and is characterised by means for maintaining at a constant value the inclination of the axis of the rotor with respect to that of the stator and for converting the conical movement of the rotor thus obtained into a rotation of the shaft of the motor.
According to a first manner of construction, the said means comprise at least one element eccentric with respect to the shaft of the motor and cooperating with a bearing of which the exterior cage is fast with the surface of the rotor.
According to a second manner of construction, the said means comprise at least one pinion or a wheel centred on the shaft of the motor and cooperating with a crown fast with the surface of the rotor, the said pinion and the said crown having a conical surface the apex of which coincides with the said centre of symmetry, the axis of the crown being inclined with respect to the shaft.
The various features, as well as the advantages of the invention, will appear clearly in the light of the following description.
In the attached drawing:
FIG. 1 is a view in axial section of a motor conforming to a first manner of construction of the invention, and which
FIG. 2 shows in transverse section;
FIG. 3 shows the detail of a ball bearing which serves for driving t
REFERENCES:
patent: 3117244 (1964-01-01), Rosain et al.
patent: 3322984 (1967-05-01), Anderson
patent: 3411026 (1968-11-01), Rosain et al.
patent: 3456139 (1969-07-01), Newell
Rosain Claude
Torossian Alexandre
Drucker William A.
Duggan Donovan F.
Societe Francaise d'Applications Industrielles et Rurales d' Ele
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