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| Number | Title | Issue Date |
| 7394218 | Servo system for a two-dimensional micro-electromechanical system (MEMS)-based scanner and method therefor A servo control system micro-electromechanical systems (MEMS)-based motion control system (and method therefor), includes a motion generator having an inherent stiffness component. ... | 07/01/2008 |
| 7317260 | Wind flow estimation and tracking using tower dynamics A turbine control system for a variable speed electrical generator in a wind turbine mounted atop a support tower. The wind turbine converts wind energy into a driving torque applied to the generator. The control system includes a turbine support tower position sens... | 01/08/2008 |
| 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 |
| 7285930 | Method and device for controlling a multiphase electronically commutated motor A method is specified for controlling a multiphase motor that is commutated by an inverter-side bridge circuit, in the course of which a particularly precise and technically simple detection of a control-relevant variable of a considered motor phase, in particular o... | 10/23/2007 |
| 7224141 | Position controller of motor A position controller of a motor in which the position time can be shortened even if an external force is applied. A speed control unit (13) comprises a compensation low-pass filter (133) having a transfer function corresponding to a delay of a speed c... | 05/29/2007 |
| 7180261 | Self-synchronous AC servo system for high-speed serial communication A self-synchronous AC servo system is used for high-speed serial communication and has multiple axes control. The system includes a computer sending command to master axis drive and slave axis drive through a transmission line. The master axis drive and slave axis d... | 02/20/2007 |
| 7164965 | Numerical controller and servomotor control system A numerical controller and a servomotor control system, capable of axis control required in case of a communication failure in the control of servomotors driven by servo amplifiers connected to a plurality of serial buses. The numerical controller has a plurality of... | 01/16/2007 |
| 7145743 | Apparatus and method for unlatching a head within a data storage device For unlatching a head within a data storage device, such as a HDD (hard disc drive), a VCM (voice coil motor) amplifier with a switch is used for applying at least one cycle of an acceleration current pulse to a voice coil motor (VCM) for unlatching the head during ... | 12/05/2006 |
| 7141946 | Method and apparatus for providing optimal acceleration feedback A method and apparatus for use with a motor controller that receives a command velocity and that applies voltages to drive a motor at the command velocity, the apparatus comprising a dual inertia lost motion assembly including a motor and a load couplable to the mot... | 11/28/2006 |
| 7119511 | Servo system for a two-dimensional micro-electromechanical system (MEMS)-based scanner and method therefor A servo control system for a micro-electromechanical systems (MEMS)-based motion control system (and method therefor), includes a motion generator having an inherent stiffness component. ... | 10/10/2006 |
| 7119505 | Servo motor control system In a servo control system, a numerical control device and at least one servo amplifier are connected to each other with a serial bus to control a servo motor connected to the servo amplifier. In this system, data transfer systems of at least two types for the serial... | 10/10/2006 |
| 7065413 | Method for producing software for controlling mechanisms and technical systems In a method for controlling mechanisms or technical systems, the mechanisms or technical systems to be controlled are stored in a controller with their states, and with associated signal formers of sensors and actuators, whereby starting from a defined reference sta... | 06/20/2006 |
| 6940582 | Parallel link mechanism, exposure system and method of manufacturing the same, and method of manufacturing devices A reticle base level block to support a reticle stage for holding a reticle, a wafer base level block to support a wafer stage for holding a wafer, and the like are supported to be independent of other portions and be controllable in their attitudes by parallel link... | 09/06/2005 |
| 6918299 | Method and apparatus for improving performance of a force balance accelerometer based on a single-coil velocity geophone The invention concerns methods and apparatus for improving the performance of a force-balance accelerometer based upon a conventional, single-coil, velocity geophone. Specifically, the operating temperature range is increased through the use of both a temperature-co... | 07/19/2005 |
| 6791294 | Servo control system There is provided a serial transmitting section for serially transmitting a command frame 100 which is sent from a host controller 1 to a positioning type servo amplifier 30 and a command follow-up type servo amplifier 50. In the command ... | 09/14/2004 |
| 6452360 | Auto tuning and parameter identification of a control circuit A method for calculating a first and second gain for a controller circuit for a plant is disclosed. The method comprises the steps of providing a reference model circuit with desired circuit characteristics, providing a reference model adaptive circuit, s... | 09/17/2002 |
| 6452354 | Closed loop control system for producing a sealed pouch A system for maintaining a desired sealing force is provided, which incorporates a closed loop control system. The system includes a platen, which has a surface for making contact with one or more items to be sealed, a motor for producing a linear movemen... | 09/17/2002 |
| 6011902 | Motor control circuit In an optical disc player, as signals are read from and written to an optical disc, the optical disc is rotated by a spindle motor and an optical pickup is moved by a sled motor. These motors are both direct-current motors. The motor control circuit of th... | 01/04/2000 |
| 5963007 | Current control method for an AC servomotor A d-phase current in the direction of a magnetic flux generated by a field system and a q-phase current in a direction perpendicular thereto are obtained from a driving current and a rotor phase of an AC servomotor by d-q conversion. DC-mode current contr... | 10/05/1999 |
| 5892347 | Tape drive with high performance gain amplifier using radio frequency dielectric heating A power amplifier (18) for driving a brushless DC motor (22) includes a processor (40) which receives a signal indicative of motor situational usage and generates a mode state signal indicative of which one of a plurality of amplification modes is to be i... | 04/06/1999 |
| 5786678 | Method and apparatus for automatically adjusting a gain of a servomechanism In a servomechanism which includes a motor and performs positioning control and velocity control, based on a response of the motor when a step command is supplied in a condition where a load is applied to the motor, the value of the load is estimated, and... | 07/28/1998 |
| 5608588 | Method for controlling digital closed servo loop system and disk storage apparatus using the system A controlled variable is detected at each predetermined timing by a detecting section 2, and the controlled variable is compared with a target value by a comparator 3 to obtain a deviation. A manipulated variable is calculated, based on the deviation, by ... | 03/04/1997 |
| 5552690 | Control unit capable of improving a response characteristic and a tracking property by selecting an optimum gain in accordance with an operating condition A basic gain providing unit provides a basic gain K0. A boundary detecting unit divides a nonlinear characteristic of a controlled variable component into a plurality of partial characteristics with a boundary interposed between two adjacent ones of the p... | 09/03/1996 |
| 5545962 | Positioning system A positioning system includes a plurality of actuators for driving an object to be positioned, a plurality of current output type amplifiers for amplifying drive signals from the actuators and for producing drive currents corresponding to the drive signal... | 08/13/1996 |
| 5285143 | Measurement of load current in a multi-phase power amplifier A power amplifier supplies substantial load currents that must be accurately monitored to provide feedback so that the load currents can be properly controlled. A sense current is generated from a load current that is scaled such that the sense current is... | 02/08/1994 |
| 4916375 | Servomotor control apparatus The invention is a servomotor control apparatus for controlling the positioning of a movable element of an industrial robot or NC machine tool. An NC unit or a robot controller detects displacement from a movable element that is to be positioned, such as ... | 04/10/1990 |
| 4908561 | Servo amplifier circuit A servo amplifier circuit, wherein a target value is obtained based on a detected output voltage of the servo amplifier circuit, and the absolute value of the target value is amplified, and then is inverted only when the target value is negative. An offse... | 03/13/1990 |
| 4888509 | Brushless servo motor construction and alignment A brushless servo motor for connection to a rotatable load without the need for initial adjustment and calibration of the external position servo loop. A plurality of keyways, keys, pins and projections ensure alignment of motor and position sensor rotors... | 12/19/1989 |
| 4611155 | Servo control circuit In a servo control circuit for driving a servomotor at a commanded velocity and torque, there are provided a servomotor voltage supply circuit, a servomotor drive current sensing circuit, a servomotor rotation sensor, a single counter for counting rotatio... | 09/09/1986 |
| 4588937 | Position control apparatus A position control apparatus has a variable gain-type velocity amplifier (115) provided within a servo control circuit, and a low velocity sensing circuit (114) for sensing a predetermined low velocity of a motor (100) immediately before the motor is stop... | 05/13/1986 |
| 4578723 | Head positioning system with automatic gain control A head positioning system with automatic gain control for use in disk information storage apparatus employs multiphase radial position error signals derived from position reference information on the disk to control the position of a transducing head by m... | 03/25/1986 |
| 4538099 | Amplifier circuit A driver amplifier circuit for an electromechanical position translator having two coils of substantially equal inductance and resistance is disclosed. The circuit includes an input for a control voltage representing desired translator position and a refe... | 08/27/1985 |
| 4349769 | Incremental integrator and the resulting servosensors Precision incremental-output integrator of the type comprising: an operational amplifier mounted as analog summing integrator, which sums currents I1 and I2 at the integrator input, characterized by the fact that current I2 | 09/14/1982 |
| 4301416 | Servo preamplifier and demodulator chain using transconductance balanced modulators An improved servo demodulator channel employing a transconductance balanced modulator as a polarity switch, an AGC amplifier and a signal separation circuit. A transconductance balanced modulator comprises two amplification transistors and four output tra... | 11/17/1981 |
| 4232259 | Servo-system A servo-system includes a high-gain direct-coupled direct current (dc) differential amplifier to which a dc input signal is fed. An adder adds the dc amplifier output to a comparison voltage, and the adder output is applied through a filter circuit to a s... | 11/04/1980 |
| 4217531 | Digitally controlled gain reduction in a positioning system A system is disclosed for positioning an instrumentality over a predetermined range in response to a digitally coded position signal. To effect a controlled reduction in the instrumentality movement, an operational amplifier is provided having a feedback ... | 08/12/1980 |
| 4189732 | Motor actuating circuitry Motor driver/control apparatus employs a motor speed regulating amplifier configuration, e.g., two push-pull power amplifiers operable responsive to a motor speed-direction command input signal, and having the motor differentially connected between amplif... | 02/19/1980 |
| 4185235 | Servo amplifier providing current torque and dynamic parameters A servo amplifier system includes first and second operational amplifiers, with the second amplifier having a low output impedance. A torque coil is connected directly from the output circuit of the first amplifier to the input circuit of the second ampli... | 01/22/1980 |
| 4161678 | Servo-system A servo-system is provided for self-balancing systems using an ac servomotor capable of maintaining loop gain substantially constant irrespective of span adjustment and without capacitor coupling. It includes a direct-coupling dc amplifier for comparing i... | 07/17/1979 |
| 4136307 | Amplifier arrangement for process controller A process controller for diameter control in drawing optical fibre preforms consists essentially of the parallel arrangement of two output amplifiers, one providing low gain at low &#b1; input voltages, while the other has high gain at high &#b1; input vo... | 01/23/1979 |
