Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 4700189 | Linear resolver A linear synchro/resolver comprised of an opposed pair of stator assemblies, each of which has a plurality of corresponding, opposed, toothed pole piece pairs, a toothed slider movably mounted between the opposed sets of pole piece pairs, and wherein the ... | 10/13/1987 |
| 4568865 | Self-corrected synchro/resolver A synchro/resolver, preferably for use in combination with a similarly constructed servo motor, having an annular stator with circumferentially arranged poles, each having a plurality of regularly pitched teeth and each pole with its own coil winding ther... | 02/04/1986 |
| 4551708 | Reactance-commutated high resolution servo motor system A synchro/resolver, preferably for use in combination with an identically constructed servo motor, having an annular stator with circumferentially arranged poles, each with its own coil winding thereon, and with the coils being connected in phases, an ann... | 11/05/1985 |
| 4532448 | Flux director, tooth shield A toothed, synchronous reluctance motor of the type having a motor made of laminations of magnetic material, has a plurality of laminations of conductive, non-magnetic material interspersed throughout the rotor to act as flux guides for radially collimati... | 07/30/1985 |
| 4501980 | High torque robot motor An electric motor comprised of laminated, coaxial, annular, inner and outer stators with an annular rotor coaxially positioned between the stators and with coils wrapped about corresponding, angularly spaced apart pole pieces of the inner and outer stator... | 02/26/1985 |
| 4481453 | Torque loop control system and method The present invention is a torque loop control system for reducing the angular position error in a microstepping motor movement when the motor is under a torsional load comprising means for sensing the torsional load on a microstepping motor and producing... | 11/06/1984 |
| 4458168 | Toothed reluctance synchro/resolver A synchro/resolver in which a plurality of primary windings and secondary windings are wound on separate stator pole pieces having projecting teeth, with the stator poles of the secondary windings being located between the stator pole pieces of the primar... | 07/03/1984 |
