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US 4,058,747 AGranted
Rotary electrical machines having a superconducting field winding
AssigneeAgence Nationale de Valorisation de la Recherche (ANVAR)
InventorsAlain Mailfert, Lionel Boyer
Life of this patent
Estimating the term…
Abstract
A synchronous rotary electric machine has a stationary superconducting D.C. field winding, a rotatable mechanical torque transmission shaft which carries normally conducting polyphase windings for providing a rotating field when A.C. currents circulate therein, and stationary auxiliary D.C. windings constructed to deliver a magnetic field. The currents in the auxiliary windings are adjusted for maintaining the torque and axial force tending to move the field winding under a predetermined value.
Claims9
A synchronous rotary electric machine having, in combination:
- a stationary frame;
- a super-conducting field winding located in a cryostat enclosure, having an axis and carried by said frame against relative movement thereof with respect to said frame along said axis, said field winding being constructed to deliver a magnetic field having n pairs of poles, n being an integer, when DC currents circulate therein;
- a mechanical torque transmission shaft rotatable with respect to said frame about said axis;
- a normally conducting polyphase winding for providing a rotating field having n pairs of poles when AC currents circulate therein, said polyphase winding being carried by said shaft, being located in side by side relation with respect to said superconducting field winding, and being connected to sliding external contacts for exchanging electrical power with an external AC circuit;
- auxiliary DC windings securely connected to said frame in side by side relation with said field winding, said auxiliary DC windings being constructed to deliver a magnetic field having n pairs of poles when DC currents circulate therein;
- and means for adjusting the currents in said auxiliary windings at a value for which both the torque and axial forces tending to move said field winding with respect to said frame are lower than a predetermined value.
3 more elements
Dependencies are inferred from the claim text.