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| Number | Title | Issue Date |
| 8159175 | Variable voltage supply system Apparatus for controlling the voltage supplied to a load, comprising: a multi-phase transformer having a primary and a secondary winding for each phase, each secondary being connected in series between an input line and an output directed to the load; and... | 04/17/2012 |
| 7969114 | Motor driving system compatible with different types of encoders A system compatible for different types of signals relates to a motor includes a differential amplifier, a comparator, and a transmitting device. The differential amplifier is configured to receive one of a differential digital pulse signals pair and a differential ... | 06/28/2011 |
| 7129665 | Control apparatus for feed driving system A control apparatus for a machine that can be operated at high precision in a stable control state is provided by driving a movable body with control parameters suited to the mechanical state. A control parameter calculation circuit is provided to obtain control par... | 10/31/2006 |
| 7119452 | Voltage control for wind generators A wind turbine generator control system includes relatively fast regulation of voltage near the individual generators with relatively slower overall reactive power regulation at a substation or wind farm level. The setpoint of the relatively fast voltage regulator i... | 10/10/2006 |
| 6919699 | Motor control apparatus A magnetic flux produced by the current of a motor is detected by means of a Hall element, and an infinitesimal current proportional to the actual current of the motor is outputted. The outputted infinitesimal current is run through a resistor, and a potential diffe... | 07/19/2005 |
| 6781337 | Multi-joint type industrial robot In an industrial robot having a plurality of arms, each arm is coupled with other elements, such as a mounting base, another arm, a robotic hand, and revolved by a motion of the revolvable joint. The revolvable joint has a rotary electric connecting structure such a... | 08/24/2004 |
| 6064191 | Current transducer and current-monitoring method A current transducer includes a current transformer in which the conductor carrying the current to be monitored constitutes the primary. The transformer secondary is wound on a toroidal core. The transformer is operated below its cut-off frequency such th... | 05/16/2000 |
| 6031350 | Position control and monitoring circuit and method for an electric motor A position control and monitoring circuitry is provided for an electric motor having a plurality of coils and a movable element. A drive circuit generates a square wave drive signal of variable mark/space ratio to drive the coils to position the movable e... | 02/29/2000 |
| 5712563 | Steering torque sensor utilizing a displacement detector having a pulse power supply A displacement detector for enabling a precise detection of a displaced quantity of the core. The displacement detector is provided with a displaceable core, a detecting coil the inductance of which varies in response to a displaced quantity and a referen... | 01/27/1998 |
| 5710509 | Phase difference detection device for an inductive position detector Two A.C. output signals amplitude-modulated in accordance with two function values (sine and cosine) differing from each other in correspondence to a position-to-be-detected are received from a position sensor such as a resolver. By performing an addition... | 01/20/1998 |
| 5539290 | Automatic venting system for a vehicle with obstruction detection utilizing dynamically modified thresholds A motor control system for controlling operation of an electric motor associated with a motor-operated vent in a vehicle. The system monitors and stores data relating to the operating current and detects occurrences of abnormal loads applied to the vent b... | 07/23/1996 |
| 5196776 | Waveform generator for a resolver A waveform generator for a resolver transducer or the like is described. Such generator forms two 3-level waveforms which approximate sinusoidal waveforms for the excitation and/or output detection of such a resolver. Each of the sinusoidal waveforms is f... | 03/23/1993 |
| 4937523 | Method and system for exploiting the signals of linear inductive sensors, which system is adaptable for different sensor structures A method and system for exploiting the signals of linear inductive sensors, which system is adaptable for different sensor structures. The system is formed of a linear inductive displacement sensor provided with a primary coil and two identical symmetrica... | 06/26/1990 |
| 4906909 | Analog electronic control differential transmitter A linear, analog, synchro control differential transmitter for implementing he common synchro CDX function whereby a scaled linear analog voltage is used as input instead of a mechanical shaft angular displacement. Alternate synchro functions of CT and CX ... | 03/06/1990 |
| 4893077 | Absolute position sensor having multi-layer windings of different pitches providing respective indications of phase proportional to displacement For enabling a resolver to have absolute position sensing over a wide displacement range while still obtaining the resolution, accuracy and precision obtainable by operation in an incremental mode, the resolver is provided with a number of terminals for p... | 01/09/1990 |
| 4857926 | Phase-responsive angular tracking device An apparatus for generating phase modulated angular positional signals in digital form. A phase tracking loop receives a phase modulated signal from the rotor of a resolver whose stator windings are excited in quadrature. The phase output of the resolver ... | 08/15/1989 |
| 4651130 | Apparatus and method for retaining phase information for use with a multiple-coil inductive displacement sensor Phase information in a multiple-coil indictive displacement sensor is retained by summing the excitation signal with each of the secondary signals to provide augmented secondary signals which may then be converted to a digital format. A signal processor m... | 03/17/1987 |
| 4418306 | Directional data stabilization system An azimuth data stabilization system for a shipborne mechanically scanned arch-track system. A unitary package is provided mounted on the roll and pitch stabilized search-track system platform. The package includes a gyro stabilized turntable with the axi... | 11/29/1983 |
| 4325013 | Electrical tracer control system utilizing sine wave resolution A control for a profiling machining tool, and a method for controlling such a tool. The machine tool includes a sensing head which moves along a template or pattern to produce a signal that causes motors relatively to shift a cutting tool and a workpiece ... | 04/13/1982 |
| 4319172 | Numerical control system A numerical control system is provided for a table having a relatively stationary member, a relatively movable member and a position transducer, such as an inductosyn, operatively positioned between them. The numerical control system comprises a high freq... | 03/09/1982 |
| 4270120 | Solid state synchro torque receiver driver A solid state synchro torque receiver driver that uses unfiltered AC as the power source and push-pull regulating transistors operating in the linear mode to drive the torque receiver stator loads. A feedback amplifier compares the push-pull outputted AC ... | 05/26/1981 |
| 4159429 | Electronic tracer unit for measuring machines A tracer unit for use with measuring machines is described. The main feature of this tracer unit is to comprise a plurality of tracer tools, each of which is provided with a rod arranged to come into contact with a surface to be scanned, a movable body connect... | 06/26/1979 |
| 4109189 | Phase-sensitive transducer apparatus with improved signal offset means A phase-sensitive transducer apparatus comprises first and second relatively movable members, the first relatively movable member having a plurality of windings and the second relatively movable member having a winding. Means are included for applying a f... | 08/22/1978 |
| 4053818 | Gyro slaving/boot strap amplifier A remote magnetic instrument, such as a compass, and a heading indicator, such as a heading gyro, are time shared in a dual channel gyro slaving amplifier with slaving and boot strap circuitry. The amplifier is a two function electronic device wherein the... | 10/11/1977 |
| 4000448 | Control system for sensing the air gap between a cutting tool and a work piece A system for sensing the air gap between a cutting tool and a work piece mounted on a machine for the purpose of controlling the traverse feed rate of the machine as contiguity approaches. A drive coil is mounted on the machine. A search coil surrounds th... | 12/28/1976 |
| 3956618 | Mechanical-electrical transducer A mechanical-electrical transducer for the simultaneous contact-free and reaction free determination of a plurality of translatory and/or rotary components of the motion or position of an object coupled to the transducer, with a computer circuit which gen... | 05/11/1976 |
