Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 7459874 | System and method for controlling electric drive systems Methods, apparatus, and systems are provided for regulating the operation of a drive system within a battery voltage and power range. The apparatus includes a PI regulator producing a signal for regulating a torque output of the drive system based on a DC voltage so... | 12/02/2008 |
| 7456598 | Method, apparatus and article for load stabilization A system, method, and article for protecting a power source for a machine from sudden changes in load. In one embodiment, energy is wasted in a winding of a motor in response to a decrease in a load presented to the power source. ... | 11/25/2008 |
| 7372231 | Movable body position control device and stage device using the movable body position control device A movable body position control device includes a pair of position detectors configured to detect moving positions of both ends of a movable body; a pair of driving parts, the driving parts being configured to drive the both ends of the movable body based on a detec... | 05/13/2008 |
| 7370524 | Adaptive vibration control using synchronous demodulation with machine tool controller motor commutation A control system and method for actively reducing vibration in a spindle housing caused by unbalance forces on a rotating spindle, by measuring the force-induced spindle-housing motion, determining control signals based on synchronous demodulation, and provide compe... | 05/13/2008 |
| 7368888 | Methods and systems for reducing unintentional collisions A method for differentiating if a feedback signal is a result of an unintentional collision in a servo system includes injecting a feed forward term in the servo system. ... | 05/06/2008 |
| 7348750 | Method, apparatus and article for load stabilization A system, method, and article for protecting a power source for a machine from sudden changes in load. In one embodiment, energy is wasted in a winding of a motor in response to a decrease in a load presented to the power source. ... | 03/25/2008 |
| 7328446 | Apparatus for reducing sensitivity of an article to mechanical shock Apparatus for reducing sensitivity of an article to mechanical shock comprises a frame; first and second planar masses mounted in the frame for bi-directional movement relative to the frame along a first axis of displacement; a first lever pivotable about a first fu... | 02/05/2008 |
| 7292001 | Gain adjusting method for servo control device An object of this invention is to provide a gain adjusting method in a servo control device to suppress changes according to a place where a machine is located. This invention provides a gain adjusting method for a servo control device providing speed control... | 11/06/2007 |
| 7237748 | Landing gear method and apparatus for braking and maneuvering Aircraft landing gear comprised of a wheel hub motor/generator disks stack, includes alternating rotor and stator disks mounted with respect to the wheel support and wheel. The wheel hub motor/generator can provide motive force to the wheel when electrical power is ... | 07/03/2007 |
| 7233087 | Electromagnetically driven rotary motor Electric energy from a battery is employed to shift the permanent magnetic field located in a generator. A spring housing is located distal from the generator. An outer magnet housing enclosing an inner rotating magnetic housing is positioned between the generator a... | 06/19/2007 |
| 7226018 | Landing gear method and apparatus for braking and maneuvering Aircraft landing gear comprised of a wheel hub motor/generator disks stack, includes alternating rotor and stator disks mounted with respect to the wheel support and wheel. The invention can provide motive force to the wheel when electrical power is applied, e.g. pr... | 06/05/2007 |
| 7190140 | Sliding mode controller position control device A position control device for causing a position of a control system, including a servomotor and a moving body driven by the servomotor, to track a command value. The position control device includes a sliding mode controller for receiving command position r and sta... | 03/13/2007 |
| 7176643 | Motor control apparatus Before an amount of play in a rotation transmitting system is learned, for selecting a gear range, an overshooting control process is performed to cause the angular displacement of a motor to overshoot a target gear range position and then reverse the electric motor... | 02/13/2007 |
| 7109679 | Damping for electromechanical actuators Oscillation and other disturbance damping is provided for a system having a load driven by an electric motor, e.g., an electromagnetic actuator. Damping is achieved using feedback in an active mode, where power is supplied in a normal operation mode of the electroma... | 09/19/2006 |
| 7072025 | Lithographic apparatus and device manufacturing method A lithographic projection apparatus in which a reaction force is generated between a balance mass and a substrate table. The balance mass is elastically coupled to the base frame with a suspension eigenfrequency of between 0.3 and 10 Hz. ... | 07/04/2006 |
| 7034492 | Methods and systems for reducing unintentional collisions A method for differentiating if a feedback signal is a result of an unintentional collisions in a servo system includes injecting a feed forward term in the servo system. ... | 04/25/2006 |
| 7026780 | Method for stabilizing the movement of an articulated chain of a chain block, especially to prevent the formation of a resonance oscillation of the chain, and a chain block apparatus The invention concerns a method for stabilizing the motion of an articulated chain of a chain block, especially to prevent the formation of resonance oscillation of the chain, in which an articulated chain is led across a polygonal chain wheel with non-uniform pitch... | 04/11/2006 |
| 7026781 | Stepping motor driving system, information recording and reproducing device, and stepping motor driving method A stepping motor driving system includes: a stepping motor that rotates at a predetermined angle according to a driving pulse signal, a vibration detector that detects vibration to output a vibration signal, and a stepping motor control unit that controls the drivin... | 04/11/2006 |
| 7019482 | Motion controller having sliding mode controller A motion controller for maintaining a controlled system on a switching hyperplane regardless of the magnitude of disturbance. The motion controller includes a target position generator, a sliding mode controller, a disturbance observer and a state observer. The targ... | 03/28/2006 |
| 6998809 | Robot apparatus, and load absorbing apparatus and method To appropriately detect overload which may break a motor or deform a body and reduce the overload in the motor. The DC component of a load torque is derived from the sum of absolute values of a torque applied to a link connected to the output shaft of a motor and th... | 02/14/2006 |
| 6995535 | Robot apparatus, and load absorbing apparatus and method To appropriately detect overload which may break a motor or deform a body and reduce the overload in the motor. The DC component of a load torque is derived from the sum of absolute values of a torque applied to a link connected to the output shaft of a motor and th... | 02/07/2006 |
| 6989645 | Robot apparatus, and load absorbing apparatus and method To appropriately detect overload which may break a motor or deform a body and reduce the overload in the motor. The DC component of a load torque is derived from the sum of absolute values of a torque applied to a link connected to the output shaft of a motor and th... | 01/24/2006 |
| 6987374 | Robot apparatus, and load absorbing apparatus and method To appropriately detect overload which may break a motor or deform a body and reduce the overload in the motor. The DC component of a load torque is derived from the sum of absolute values of a torque applied to a link connected to the output shaft of a motor and th... | 01/17/2006 |
| 6979969 | Robot apparatus, and load absorbing apparatus and method To appropriately detect overload which may break a motor or deform a body and reduce the overload in the motor. The DC component of a load torque is derived from the sum of absolute values of a torque applied to a link connected to the output shaft of a motor and th... | 12/27/2005 |
| 6979972 | Method and apparatus for detecting a stalled stepper motor A method for detecting a state of an electric motor includes: energizing the motor with electrical power such that an associated current applied to the electric motor rises over time toward a reference level; determining an amount of time that elapses between when t... | 12/27/2005 |
| 6965210 | Robot apparatus, and load absorbing apparatus and method To appropriately detect overload which may break a motor or deform a body and reduce the overload in the motor. The DC component of a load torque is derived from the sum of absolute values of a torque applied to a link connected to the output shaft of a motor and th... | 11/15/2005 |
| 6959787 | Elevator car frame vibration damping device A device for active vibration damping dampens the structural resonance of an elevator car frame with a car body through measurement of the deformation of the frame. Under elastic deformation, a safety plank and a crosshead of the frame move parallel and relative to ... | 11/01/2005 |
| 6956346 | Robot apparatus, and load absorbing apparatus and method To appropriately detect overload which may break a motor or deform a body and reduce the overload in the motor. The DC component of a load torque is derived from the sum of absolute values of a torque applied to a link connected to the output shaft of a motor and th... | 10/18/2005 |
| 6956345 | Robot apparatus, and load absorbing apparatus and method To appropriately detect overload which may break a motor or deform a body and reduce the overload in the motor. The DC component of a load torque is derived from the sum of absolute values of a torque applied to a link connected to the output shaft of a motor and th... | 10/18/2005 |
| 6946805 | Controller for a light display A controller for controlling decorative light displays includes plural outlet ports for providing power to a plurality of decorative light strings. The controller alternately illuminates and dims the different lights strings according to a variety of synchronized pa... | 09/20/2005 |
| 6927550 | Device and method used to automatically compensate for synchronous disturbance To eliminate unwanted vibrations caused by synchronous disturbances, such as synchronous disturbances caused by an imbalance, for example, the invention proposes a compensation device for closed loop compensation of a synchronous disturbance in a rotating machine co... | 08/09/2005 |
| 6911791 | Method and device for the reduction of load cycle oscillations in the drive train of a motor vehicle Load cycle oscillations in the drive train of a motor vehicle are reduced by detecting a change in available torque in the drive train, determining the period of a load cycle oscillation, and, at the commencement of the available torque change, applying at least one... | 06/28/2005 |
| 6906786 | Lithographic apparatus and device manufacturing method A lithographic projection apparatus in which a reaction force is generated between a balance mass and a substrate table. The balance mass is elastically coupled to the base frame with a suspension eigenfrequency of between 0.3 and 10 Hz. ... | 06/14/2005 |
| 6891597 | Driving apparatus, exposure apparatus, and device manufacturing method A driving apparatus which drives an object along a guide surface in X and Y directions. The apparatus includes a first actuator which drives the object in the X direction, a second actuator which drives the object in the Y direction, and a controller which controls ... | 05/10/2005 |
| 6879126 | Method and system for positioning a movable body in a magnetic bearing system A magnetic bearing system allows a movable body to be positioned to a point of substantial equilibrium in an axial direction after a system shutdown. A sensor measures the axial position of the movable body to produce an displacement output. That output is then adju... | 04/12/2005 |
| 6876168 | Disturbance attenuation in a precision servomechanism by a frequency-separated acceleration soft sensor In servomechanisms, like for example used in disk drives, disturbances, for example, friction, shock and vibration, prevent the system positioning accuracy from further improvement. These disturbances occur in a relatively low-frequency range compared to the electri... | 04/05/2005 |
| 6861816 | Positional control of a controlled object during movement initiation In a positional control device for controlling a position of a controlled object using a motor, when generating a torque command value τc which serves as the command value for the servo motor of the controlled object system (112), a friction compensation val... | 03/01/2005 |
| 6734650 | System and method for controlling an active magnetic bearing using continuous variable compensation A system and method for controlling an active magnetic bearing assembly by varying the system control laws in a continuous non-linear fashion as a function of rotor rotational speed. The system control law variation is carried out in a continuous and optimal manner ... | 05/11/2004 |
| 6690136 | Numerical controlling unit The invention relates to a numerical controlling unit that includes: a instructing part that provides a command acceleration for a servomotor, a parameter storing part that stores a threshold parameter about a load of the servomotor, and a load measuring ... | 02/10/2004 |
| 6677722 | Servo control method The servo control method operates a set value of a first-order lag time constant of a feedback compensation by both a detected mechanical position value and a transfer function corresponding to a change of an angular velocity about each axis under a multi... | 01/13/2004 |
