| US 7,598,643 B2 | ||
| Motor with electrodynamically and hydrodynamically supported rotor | ||
| William D. Davis, P.O. Box. 1093, Dripping Springs, Tex. 78620 (US); and David M. Lancisi, 104 Luttrel Ct., Folsom, Calif. 95630 (US) | ||
| Appl. No. 10/556,861 PCT Filed May 15, 2003, PCT No. PCT/US03/15155 § 371(c)(1), (2), (4) Date Nov. 14, 2005, PCT Pub. No. WO2004/106746, PCT Pub. Date Dec. 09, 2004. |
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| Prior Publication US 2007/0053781 A1, Mar. 08, 2007 | ||
| Int. Cl. H02K 7/09 (2006.01) | ||
| U.S. Cl. 310—90.5 [310/67 R; 310/90] | 19 Claims |
| 1. An apparatus comprising:
a rotor;
a stator;
a plurality of permanent magnets forming bearing poles coupled to a selected one of the stator and the rotor; and
a plurality of shorted coils coupled to the other of the stator and the rotor, wherein the plurality of bearing poles and
shorted coils co-operate to form an electrodynamic bearing during rotation of the rotor, wherein at least one of the stator
and the rotor includes hydrodynamic bearing surfaces for generating a hydrodynamic bearing between the rotor and stator.
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