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| Number | Title | Issue Date |
| 8138708 | Closed-loop motor driver compensation A control loop circuit for use in a closed-loop control system that controls a system such as a linear motor is presented. The control loop circuit includes a lead-lag compensator that features a lead compensation network configured to reduce output noise without su... | 03/20/2012 |
| 7911172 | Machine position control device An accurate load position control is made possible even when rigidity of a load drive system using a motor is relatively low. Load position signal xl is a present-position measurement value of a load, and after compensation in response to a phase delay th... | 03/22/2011 |
| 7911173 | Open loop method for controlling power A method of power control for an electrical motor using open-loop principles is disclosed. The method employs a desired control line function that determines hold-off time based on a detected phase lag of a motor drive signal. The motor to be controlled is driven wi... | 03/22/2011 |
| 7432681 | Scanner system A scanner system includes a servo control unit. A rotation angle of a rotating shaft supporting a mirror is detected, and an error of the detected value with respect to a commanded value is integrated by an integral compensator so that the detected value is able to ... | 10/07/2008 |
| 7376063 | Control circuit of optical storage device and method thereof A control circuit of an optical storage device includes a loop phase calculation unit for calculating a closed loop phase of a servo system according to at least one error signal of the servo system and a system control unit coupled to the loop phase calculation uni... | 05/20/2008 |
| 7345442 | Device for controlling electric-motor power steering device Distortions of motor voltage and current and a torque ripple of the motor are generated by dead band compensation for preventing an arm short circuit of an inverter, and a feeling of physical disorder is given in a handle operation. Therefore, the distortions of the... | 03/18/2008 |
| 7345448 | Adaptive command filtering for servomechanism control systems Preferred embodiments of the invention implement techniques for modifying the command trajectory, the architecture of a servomechanism control system, or both, to reduce the servo error during and/or after the command trajectory. An iterative refinement procedure ge... | 03/18/2008 |
| 7265507 | Angular position and velocity estimation for synchronous machines based on extended rotor flux A method of correcting the determination of extended rotor flux using a lag function and a correction algorithm that closely approximates a pure integrator function to correct for lag function errors that can extend the EFS control down to dynamoelectric machine spe... | 09/04/2007 |
| 7245975 | Skew compensation A system and method for generating master and slave reference signals is disclosed, wherein at least one axis of the plurality of axes is a master section and at least one axis of the plurality of axes is a slave section, said slave section being a slave of said mas... | 07/17/2007 |
| 7208901 | Control method for jerk-limited speed control of a movable machine element of a numerically controlled industrial processing machine A control method for controlling a speed of a movable machine element of a numerically controlled industrial processing machine with jerk limitation is described. The processing machine can be, for example, a machine tool, a production machine and/or a robot. A trav... | 04/24/2007 |
| 7184847 | Method and system for controlling a process in a plant A method and system are disclosed for controlling a process by establishing a control factor for a proportional-integral-derivative (PID) controller used to control a parameter of a process relative to a setpoint. A feedback signal regarding the parameter of the pro... | 02/27/2007 |
| 7102315 | Robot arm control method and control device When either a command value or an actually measured value is appropriately selected as an angular velocity used for the frictional torque calculation, the frictional compensation can be made valid at all times in both the case in which a robot is actively operated a... | 09/05/2006 |
| 7042186 | Decoupling a harmonic signal from a signal path A method for decoupling a harmonic signal from an input signal wherein the harmonic signal is harmonic relative to a signal other than the input signal. An angular position of the other signal is multiplied by a value representing the harmonic to obtain an angular p... | 05/09/2006 |
| 7015670 | Method of controlling a high-friction electro-mechanical servo-mechanism to minimize the power needed to hold a loaded output member The invention provides a method for controlling an electromechanical servomechanism (20) for moving an output member relative to a variable load (38). The servomechanism includes: a motor (37) having at least one coil (32A, 32B or ... | 03/21/2006 |
| 6992453 | Actuator control system An actuator control system restrains hindrance to an object under control by an interfering substance that exists on its traveling path when the object is moved toward a target position on one axis while the object has been positioned at a target position on the oth... | 01/31/2006 |
| 6952320 | Virtual tracks for repeatable runout compensation The present invention relates to repeatable runout (RRO) compensation of servo control systems that can be used in disc drives or spin-stands. The RRO relates to eccentricity between servo tracks, which were written onto a disc prior to the installation of the disc ... | 10/04/2005 |
| 6941851 | System for elevation and directional angle aiming of a weapon An elevation and traverse laying system for a weapon comprising a first traverse positioning element to position the weapon in traverse along a large angular range with respect to a first axis of rotation in traverse, having a first positioning element in elevation ... | 09/13/2005 |
| 6914404 | Motor controller A motor controller, comprising a first simulation control unit (8) and a second simulation control unit (9) as a feed forward control means for inputting a command to an actual control unit (10) performing a feedback control, wherein the control... | 07/05/2005 |
| 6903528 | Machine model estimating device of electric motor control apparatus A machine model estimating device of an electric motor control apparatus having an electric motor for driving a load machine, a rotation detector for detecting a rotating angle of the electric motor, and a servo control device for controlling the electric motor. The... | 06/07/2005 |
| 6903530 | Electric motor controller resonance frequency detection apparatus A resonance frequency detector for an electric motor controller in which a resonance frequency can be measured at high speed by a simple calculation and the resonance frequency can be detected by an inexpensive computer is provided. In an electric motor control syst... | 06/07/2005 |
| 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 |
| 6859006 | POSITION CONTROL SYSTEM FOR USE IN DRIVING SYSTEM TRANSMITTING DRIVING FORCE OF DRIVING SOURCE TO DRIVEN MEMBER THROUGH POWER TRANSMISSION MECHANISM, IMAGE FORMING APPARATUS, POSITION CONTROL METHOD, PROGRAM FOR PERFORMING THE POSITION CONTROL METHOD, AND STORAGE MEDIUM HAVING THE PROGRAM STORED THEREON A position control method for accurate position control of a driving source is disclosed. The method of the present invention comprises the steps of comparing a remaining driving amount of the driving source to a target position with a mechanical dead zone of a powe... | 02/22/2005 |
| 6825633 | Method for adapting jerk profiles through jerk limitation for minimizing excitations of oscillations during movement of a machine element The excitation of an oscillation in a mechanical system, such as a machine element, subjected to a jerk can be suppressed or at least attenuated by rounding a corresponding jerk curve and/or by tuning the stop band of a bandstop filter to the characteristic frequenc... | 11/30/2004 |
| 6812668 | Apparatus, method and program for controlling an electric motor Apparatus, method and program for controlling electric motors to drive movable objects, wherein an input-rectifying device is operable, when a control signal to be applied to one of the electric motors requires the motor to be operated so as to operate the object in... | 11/02/2004 |
| 6713978 | Method and system for determining induction motor speed A non-linear, semi-parametric neural network-based adaptive filter is utilized to determine the dynamic speed of a rotating rotor within an induction motor, without the explicit use of a speed sensor, such as a tachometer, is disclosed. The neural network-based filt... | 03/30/2004 |
| 6696809 | Robot, servo circuit, actuator, robot control method, and actuator driving method Based on a control object, a result of the detection of driving of an actuator and a response from a standard mathematical model of the actuator, the actuator is controlled, or in a servo system that controls the angle of a joint, etc., the control value ... | 02/24/2004 |
| 6566837 | Position controller for motor A position controller for motors for increasing the position loop gain of a full-close control system without causing recurrence of vibration. The controller where a position signal representing the position of a movable table and outputted from straight-... | 05/20/2003 |
| 6507165 | Controller for machine A controller for a machine such as a robot and a machine tool having an electric motor as a driving source of the machine, capable of suppressing a natural vibration of the machine and/or an attachment attached to the machine. A frequency or a cycle of th... | 01/14/2003 |
| 6477445 | Method and apparatus for controlling an industrial robot An equipment for controlling an industrial robot, which robot has a plurality of rotation and/or translation axles (ax 1-6), comprising a motor (15) at each of said axles for generating desired movements of the arms and/or the wrist, of which the robot is... | 11/05/2002 |
| 6323614 | System and method for controlling suspension using a magnetic field A system for controlling the position of a rotating member suspended using a magnetic field includes at least one sensor that is operable to detect the position of the rotating member, the sensor further being operable to generate a position reference sig... | 11/27/2001 |
| 6255794 | Procedure for the digital evaluation of analogue resolver output signals In a procedure for the digital evaluation of the analogue output signals from a resolver with at least two stator windings, arranged perpendicular to each other on a stator, and at least one rotor winding on a rotor able to rotate in relation to the stato... | 07/03/2001 |
| 6252369 | Motor speed controller and gain setting method of the controller A motor speed controller with high speed response characteristics. The controller comprises a proportional operating means, a means (1) which controls the angular velocity of a motor, an equivalent rigid body model (21) modelled in a primary delay system ... | 06/26/2001 |
| 6084371 | Apparatus and methods for a human de-amplifier system A human de-amplifier system for interfacing a human operator and a physical object through a physical plant, wherein the physical object has dimensions in the range of 1 micrometer to 1 mm. The human de-amplifier system uses an inner-feedback loop to incr... | 07/04/2000 |
| 5979587 | Electrically assisted power steering apparatus An electronically assisted power steering system (10) for providing assist in response to a steering control signal includes a steering torque sensor (30) operatively connected to a vehicle hand wheel (12) for providing a torque signal indicative of appli... | 11/09/1999 |
| 5838123 | Automatic phase adjuster for a brushless motor driving signal An automatic phase adjuster for the driver of a brushless motor is provided. This automatic phase adjuster can output a driving signal adaptively with a suitable phase-lead or phase-lag angle so as to allow the motor to be operated with the optimal output... | 11/17/1998 |
| 5625267 | Constant delay filtering for synchronized motion on multiple axes In a linear feedback servo control system, the motion profile for each axis is pre-filtered before it is introduced to the servo loop for that axis. The motion profile is pre-filtered by a filter having an inverse amplitude response to the amplitude respo... | 04/29/1997 |
| 5581166 | Industrial robot with servo In a device having a first member and a second member which are driven relative to one another by an actuator, a servocontrol derives feedback by sensing the torque applied on one of the members by the actuator. The actuator drive signal is modified by a ... | 12/03/1996 |
| 5323096 | Servomotor control device using servomotor rotation speed extrapolation A servomotor control device including a drive pulse generating circuit for generating a pulse signal having a frequency corresponding to an actual frequency of a servomotor, and arithmetic operation unit for outputting a control signal on the basis of the... | 06/21/1994 |
| 5122718 | Gain/phase compensation circuit for use in servo control system of optical disk device A gain and phase compensation circuit for use in the servo control system for an optical disk device comprises a digital signal input terminal for receiving an input digital signal to be treated, a first digital filter circuit having an input connected to... | 06/16/1992 |
| 5105138 | Two degree of freedom controller A two degree of freedom PID controller which includes a setpoint filter for performing a derivative operation on a process disturbance signal in accordance with a setpoint value and a control value of a controlled system, thereby outputting a setpoint sig... | 04/14/1992 |
