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"I watched his countenance closely, to see if he was not deranged ... and I was assured by other senators after he left the room that they had no confidence in it."
U.S. Senator Smith of Indiana ; After seeing Samuel Morse demonstrate the telegraph.
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| Number | Title | Issue Date |
| 7116030 | High-speed synchronous motor An electric motor for operation at very high speeds comprises a ferromagnetic stator (11), a ferromagnetic rotor (13) having a rotor core (16) with a plurality of reluctance poles (17) spaced from the stator by an air gap (G), and a rotor... | 10/03/2006 |
| 7088025 | Variable-reluctance resolver and rotational angle sensor using same A variable-reluctance resolver includes a rotor and a stator. The rotor includes axially connected first and second rotor portions. The first rotor portion has n salient poles provided about a center axis at uniform angular intervals, where n is an arbitrary integer... | 08/08/2006 |
| 7068015 | Wind power plant having magnetic field adjustment according to rotation speed A wind power plant where the driving shaft communicates with a synchronous generator (3) optionally through a gear (2) and with a transformer, if any, communicating through an AC/DC inverter 7 with an HVDC transmission cable 9. The synchr... | 06/27/2006 |
| 7030532 | Variable reluctance resolver A variable reluctance resolver has a rotor which includes a noncircular core and which is rotatably supported inside a stator with a gap therebetween. The shape of the rotor is such that the gap permeance, which is based on the gap, varies according to a sine functi... | 04/18/2006 |
| 7009385 | Flux compensated rotational position detector and operating methods therefor A flux compensated rotational position detector includes a rotating element having a plurality of magnetic poles extending over its entire periphery, and a fixed element having a plurality of protruding fixed-element magnetic poles with fixed-element magnetic pole t... | 03/07/2006 |
| 7005771 | Variable reluctance resolver A variable reluctance resolver is provided with an output winding having a reduced effect from externally introduced leakage magnetic flux. A variable reluctance resolver is provided with a resolver excitation winding and a resolver output winding wrapped around mul... | 02/28/2006 |
| 6975057 | Rotary electric machine having a stator made up of sectors assembled together The invention relates to a rotary electric machine including a stator, powered by a polyphase current, having a magnetic circuit with teeth forming intervening slots for receiving electrical conductors. The magnetic circuit is made up of an assembly of sectors defin... | 12/13/2005 |
| 6952152 | Winding fixing structure of a rotary transformer-type resolver A spacer 2 is provided between an inner core 62 and a resolver rotor 63, which are respectively attached to a rotary shaft 68. A cutout groove 42 is formed at a flange 41 of the inner core 62. A fixing groove 3 | 10/04/2005 |
| 6909205 | Motor assembly allowing output in multiple degrees of freedom A motor allowing multiple degrees of output freedom includes a stator having an interior surface forming at least a portion of a sphere or curved surface and first and second substantially orthogonally positioned stator coils wound on the interior surface. A rotor i... | 06/21/2005 |
| 6512437 | Isolation transformer An isolation transformer is provided having primary and secondary cores (2, 4) and primary and secondary coils (3, 5) with the primary coil and the secondary coil being disposed with a gap G provided therebetween. Each of the primary coil and the secondar... | 01/28/2003 |
| 6307440 | Oscillating circuit, an oscillator frequency adjusting method, and a tuner In an oscillator circuit employing a pattern coil on a printed-wiring circuit board as a resonator circuit, in order to satisfactorily adjust dispersion in oscillation frequencies, an air-core coil wound by 0.5 turn and less than one turn is provided so a... | 10/23/2001 |
| 5994896 | Electrical switch A switch lever of an electrical switch can be moved into various switch positions. A ferrite core is disposed at the switch end of the switch lever. A primary coil and a secondary coil are disposed about each switch setting. The primary coil induces a vol... | 11/30/1999 |
| 5903205 | Induction-type rotational position detecting device A group of secondary windings are distributively provided on a stator over a predetermined range, and the respective inductance of the secondary windings in the group is set in such a manner to present predetermined inductance distribution. A rotor has an... | 05/11/1999 |
| 5701114 | Rotary variable differential transformers A Rotary Variable Differential Transformer, having a short axial length, small diameter, and a wide angle, linear output range, is provided. The Rotary Variable Differential Transformer (RVDT) comprised of a housing, a hollow cylindrical coil form made of... | 12/23/1997 |
| 5596469 | Apparatus for limiting high current electrical faults in distribution networks by use of superconducting excitation in transverse flux magnetic circuit An electrical fault limiter having first, second, third, and fourth magnetic cores. The first magnetic core opposes the second magnetic core and is adjacent to the third magnetic core. The fourth magnetic core opposes the third magnetic core and is adjace... | 01/21/1997 |
| 5402096 | Transducers A transducer comprises a pair of inductive coils connected in series. The coils of the pair are arranged adjacent one another with respective end faces of the coils substantially mutually aligned. A magnetically permeable member is movable relative to the... | 03/28/1995 |
| 5347257 | Varying inductances A variable inductor includes at most one coil of electrically conductive material and at most two distinct, separately formed portions of magnetic core material positioned to conduct magnetic flux resulting from passage of electrical current through the c... | 09/13/1994 |
| 5264768 | Active hand controller feedback loop An active hand controller system is provided wherein a feedback loop detects the position of a control stick to control a motor driving the control stick to thereby provide certain force feel characteristics to the control stick. The feedback loop include... | 11/23/1993 |
| 4991301 | Inductive displacement sensors Two members 21,22 are relatively displaceable along a linear or circular path. One member 21 provides a plurality of coil portions along the path. Their individual inductances are dependent on the configuration of the second member 22. For example, the fi... | 02/12/1991 |
| 4945274 | Angular pulse generator with flux return In an angular pulse generator having a movable generator part and a read head, the read head has a primary winding (W1) fed with an alternating voltage of a defined frequency and has a secondary winding (W2) whose induced secondary voltage is modulated by... | 07/31/1990 |
| 4910488 | Rotary variable differential transformer with eccentric rotor core A rotary variable differential transformer produces a substantially linear output over about 180 degrees of rotation of a rotor core. The transformer includes a base housing having a central bore, and a rotor having a shaft whose angular displacement is t... | 03/20/1990 |
| 4881414 | Torque detection apparatus A torque detection apparatus for measuring a torque applied between a drive shaft and an output shaft which is applicable to an electric power steering system of a motor vehicle. The torque detection apparatus is provided between the drive and output shaf... | 11/21/1989 |
| 4855704 | Joystick for generating electric control signals A joystick for generating electric control signals comprises the following components: a housing, an operating rod, a universal joint for the operating rod, sensors and an element acting upon these in a positionally dependent manner. The distance of the e... | 08/08/1989 |
| 4794511 | Apparatus and method for generating two-phase signals for use with a resolver to digital converter Two-phase voltage signals for use with a resolver-to-digital converter (RDC) are produced as a periodic function of permeance developed across an air gap between a rotor and stator wherein the permeance varies as a periodic sinusoidal function which can b... | 12/27/1988 |
| 4764767 | Absolute rotational position detection device On a circumferential side surface of a single cylindrical member constituting a main body of a rotor section are disposed, in parallel, a first pattern which repeats change in the circumferential direction with a predetermined pitch and a second pattern w... | 08/16/1988 |
| 4688444 | Control device A control device for producing electrical signals which correspond to manual movements of a stick part and which are used for adjustment of a controlled element has a relatively stationary body part with a hand supporting surface and a stick projecting ou... | 08/25/1987 |
| 4672347 | Multi-speed resolver using ferrite stator and rotor structures A resolver which in a preferred embodiment utilizes a stator member, preferably made of a single piece of ferrite material, which has active stator sine poles and active stator cosine poles and a rotor member which has passive rotor poles. The active stat... | 06/09/1987 |
| 4649755 | Sensor for magnetizable materials A sensor for magnetizable materials is comprised of an inductive component and an evaluating circuit. The inductive component is constructed by thin-film techniques. The core is made of a ferromagnetic amorphous metal. Such a sensor can detect the presenc... | 03/17/1987 |
| 4642595 | Contactless electric control-handle A contactless electric control handle having a field coil for forming an electro-magnetic field, inductive pick-up coils angularly spaced apart around the axis of the field. The rod of the control handle constitutes the core of the field coil. The field c... | 02/10/1987 |
| 4631510 | Harmonically graded airgap reluctance-type rotating electric resolver This invention relates to a harmonically graded airgap reluctance-type rotating electric resolver. The magnetic permeance of the airgap is made to vary sinusoidally. Therefore, only the fundamental wave exists, free of higher harmonics. The invention has ... | 12/23/1986 |
| 4604575 | Multiple output rotational position detection device This device comprises a first detector having a first rotor and a first stator for detecting an absolute rotational position within one cycle which corresponds to 1/N circumference, said rotor having teeth of N, and a second detector having a second rotor... | 08/05/1986 |
| 4551699 | Rotary variable differential transformer A rotary variable differential transformer has coil windings at an angle with respect to the longitudinal axis of the transformer and a core rotatable about this axis with end faces cut at projected angles therewith such that a rotation of the core varies... | 11/05/1985 |
| 4544803 | Positional transducer A positional transducer includes a nonconductive plate having four ferrite tube inductors mounted at preselected locations in the plate. Two interconnected permanent magnets are mounted on either side of the plate with opposite poles facing the plate for ... | 10/01/1985 |
| 4542062 | Magnetic recording medium A magnetic recording medium comprises a magnetic alloy layer on a substrate wherein said magnetic alloy layer is made of 70-90 wt. % of Co and 30-10 wt. % of at least one of Si, Sb, Li, V, Ta, Ge and Pt and a magnetization axis of said magnetic alloy is s... | 09/17/1985 |
| 4517471 | Rotary converter machine for direct transfer of electric energy by flux linkage between windings on a stator pack A rotary converter machine which includes a stator with three-phase primary, and secondary windings, and a rotor mounted within the stator which includes a damping winding. The primary and secondary stator windings are arranged on a common stator pack and... | 05/14/1985 |
| 4517509 | Inductive device An induction device comprises a winding support with a base having connection points. The upper side of the base carries a centering member having an exterior surface that defines either a cylindrical or conical surface co-axial with the cylindrical centr... | 05/14/1985 |
| 4464645 | Angular displacement transducer of the variable reluctance type An angular displacement transducer of the variable reluctance type is disclosed. It utilizes two relatively rotatable rotors with two sets of magnetic circuits and a coil associated with each magnetic circuit. Each set of magnetic circuits has a set of ma... | 08/07/1984 |
| 4462015 | Electromagnetic pick-off control handle A joystick mechanism generates output signals corresponding to the X and Y components of a manual command. A transducer mounted in a housing includes a ferromagnetic vane member connected to the bottom of a handle extending into the housing. The transduce... | 07/24/1984 |
| 4445103 | Rotary differential transformer with constant amplitude and variable phase output A rotary differential transformer is provided which has a constant amplitude output the phase angle of which varies with the angular displacement of a rotor. The rotor contains a pair of core segments of magnetic material which serve to couple portions of... | 04/24/1984 |
| 4437351 | Control stick force transducer In combination with a control stick having a grip handle, a control stick force transducer includes a flexure means having a pair of parallel plates, one secured to the grip handle and one secured to the control stick and at least three compliant columns ... | 03/20/1984 |
