Class / Patent application number | Description | Number of patent applications / Date published |
318611000 | With stabilizing features (e.g., anti-hunting, damping) | 55 |
20080211446 | Control Apparatus of Electric Power Steering Apparatus - The present invention provides a control apparatus of a electric power steering apparatus which can suppress a vibration and a noise of a motor caused by a torque ripple which is generated at a tie of applying a field-weakening control to the motor or on the basis of a motor circulating current. Accordingly, the control apparatus actually measures a relation between a basic correcting current and a rotor position which can suppress the torque ripple generated at a time of applying the field-weakening control or the torque ripple based on the motor circulating current, previously, and adds a correcting current which is regulated by taking into consideration a magnitude of a weak field current of a correcting current, a magnitude of an angular velocity of the rotor or an electrical angle of the circulating current with respect to the basic correcting current, to an original current command value. | 09-04-2008 |
20090058346 | ELECTRIC MOTOR CONTROL APPARATUS - In order to simultaneously realize an improvement in disturbance suppression force of an electric motor control apparatus and vibration suppression of a load machine, a velocity control circuit receives a velocity command signal as a target value of velocity of an electric motor and a corrected velocity signal, obtained by correcting a velocity signal with a velocity correction signal, and outputs a torque command signal specifying target torque of the electric motor driving the load machine. A vibration suppression circuit outputs a velocity correction signal, based on an acceleration signal, indicating acceleration of the load machine. A transfer function from the acceleration signal to the torque command signal is obtained by multiplying a transfer function from a position signal, indicating position of the electric motor to the torque command signal, by a proportion characteristic having a specified gain and integration characteristic. | 03-05-2009 |
20090251093 | Motor control apparatus - A velocity control loop of a motor control apparatus including a notch filter. The notch filter attenuates a signal component at a central frequency from a motor driving command, and outputs the attenuated motor driving command. The driving of a motor is controlled based on the attenuated motor driving command. The central frequency of the notch filter is set equal to a frequency at which a phase of open loop frequency characteristics of the velocity control loop that does not include a notch filter is a value obtained by subtracting 180 degrees from a preset phase margin. An attenuation factor of the notch filter by which the signal component at the central frequency is attenuated is set so that a gradient of a phase diagram of the open loop frequency characteristics of the velocity control loop including the notch filter is substantially zero. | 10-08-2009 |
20090284207 | Reaction force cancel system - Stabilization of a stage in a movable stage apparatus is enhanced, and increasing in size of the movable stage apparatus is suppressed. A reaction force cancel system is provided in the movable stage apparatus where a stage moves on a surface plate installed on a floor via a vibration-isolating spring, and cancels a reaction force generated on the surface plate upon movement of the stage. The reaction force cancel system includes a reaction force canceling actuator for applying a counter-thrust that is a force for reducing the reaction force to the surface plate. The reaction force canceling actuator is arranged at a lower position than a top surface of the surface plate so that the surface plate hangs over the reaction force canceling actuator. | 11-19-2009 |
20100060226 | MOTOR CONTROL SYSTEM - A motor control system suppresses vibration of a machine base and achieves high-speed positioning without using a special sensor but using a model control system. A first feedback section outputs a first feedback command generated based on model machine base position information and containing at least position information on the machine base. A second feedback section outputs a second feedback command containing a filtered model torque command. A differential between the sum of the first feedback command and the second feedback command obtained by a second addition section and the model torque command is calculated to give the differential to an input portion of a model torque command low-pass filter and an input portion of a torque command low-pass filter. The model control system gives a model position command to a position controller as a position command, and model machine base position information generated based on the model position command is added to a speed command input from the position controller to a speed controller. | 03-11-2010 |
20100079100 | METHOD AND APPARATUS FOR CONTROLLING INERTIAL SYSTEM - Suppression of vibration of a load machine without reducing the responsiveness of the load machine to an operation command is achieved by a method and an apparatus for controlling an inertial system intended to control an inertial system that has a motive power generator and a load machine that are coupled to each other via a torque transmission element. Acceleration command information that designates the acceleration of the load machine is multiplied by a predetermined gain to produce a vibration suppression control variable. The vibration suppression control variable is added to the position command to form a vibration suppression control command, and the inertial system is controlled according to the vibration suppression control command. | 04-01-2010 |
20100181954 | METHOD OF MANAGING THE STEERING CONTROL OF AN AIRCRAFT UNDERCARRIAGE - The invention relates to a method of managing a steering control for a steerable portion of an aircraft undercarriage, the method comprising implementing servo-control to servo-control an electromechanical steering actuator on an angular position setpoint, wherein, according to the invention, the servo-control implements a control relationship H∞ type, the position and speed information being delivered by means of a fieldbus of deterministic type to a computer that implements the servo-control. | 07-22-2010 |
20110074332 | METHODS AND SYSTEMS FOR ELIMINATING STRUCTURAL MODES IN A SERVO MECHANISM EMPLOYED TO CONTROL A FLEXIBLE STRUCTURE - A servo system is provided for controlling movement of a flexible structure having multiple masses and elements. Each element couples a respective two of the masses and functions as a spring when the flexible structure is subject to a linear or rotational input at or above a frequency at which the respective element exhibits flexure. The servo system includes multiple sensors, where each sensor is disposed relative to a respective one of the masses to sense a respective acceleration. A motor having a torque input may operatively be configured to output one of a linear or rotational force on the first mass based on a torque signal present on the torque input. A servo controller that receives each sensed acceleration from each sensor may generate a compensation feedback signal based on a sum of sensed accelerations. The torque signal may be output to the motor based on the compensation feedback signal. | 03-31-2011 |
20110193510 | POSITIONING SYSTEM AND METHOD - A system for positioning an object, having a fixed base, a support for the object, an actuator for applying a force to displace the support relative to the fixed base, a sensor for measuring the load force on the support, and a controller for processing the measured load force to control the position of the support and/or damp at least one resonance frequency of the system. A method of controlling the system is also provided. | 08-11-2011 |
20110298409 | METHODS AND SYSTEMS FOR IMPROVING POSITIONING ACCURACY - A human-operated system comprises a positioning system and an input shaper. The positioning system moves an object from one location to another. The positioning system includes a computing device that controls the movement of the positioning system responsive to receiving a user command. The input shaper is coupled to the computing device of the positioning system. The computing device estimates an overtravel of the positioning system and determines an overtravel constraint that is factored into the movement of the positioning device. The computing device moves the positioning system based on the overtravel constraint in a manner that limits the overtravel, deflection and vibration of the object as the object is moved from one location to another. The human-operated system includes a predictive element that represents a predictor location responsive to the user command provided by the human operator, which aids the human operator position the positioning system. | 12-08-2011 |
20110309782 | METHOD AND DEVICE FOR MONITORING A MOVEMENT-CONTROLLED MACHINE WITH AN ELECTRONICALLY COMMUTATED DRIVE MOTOR - In a method and device for monitoring a movement-controlled machine, such as a manipulator, having an electronically commutated drive motor for which a commutation angle is provided based on its detected real position and a control variable, in particular a predetermined desired position, a limit value is determined for a rate of change in particular a time derivative of the real position of the drive motor, and the commutation angle is predetermined such that the rate of change of the commutation angle does not exceed a limit value. | 12-22-2011 |
20110316467 | PARALLEL MECHANISM - A parallel mechanism includes a base portion, a bracket to which an end effecter is attached, a plurality of actuators attached to the base portion, a plurality of arms through which the plurality of actuators and the bracket are coupled together in parallel, and a control device arranged to control the actuators. When the end effecter in a stopped state is moved to a target position, the control device is arranged to control the actuators so that a level of acceleration at which the end effecter is accelerated is higher than a level of deceleration at which the end effecter is decelerated. | 12-29-2011 |
20120194120 | SYSTEM AND METHOD FOR TENSIONING A ROBOTICALLY ACTUATED TENDON - A tendon tensioning system includes a tendon having a proximal end and a distal end, an actuator, and a motor controller. The actuator may include a drive screw and a motor, and may be coupled with the proximal end of the tendon and configured to apply a tension through the tendon in response to an electrical current. The motor controller may be electrically coupled with the actuator, and configured to provide an electrical current having a first amplitude to the actuator until a stall tension is achieved through the tendon; provide a pulse current to the actuator following the achievement of the stall tension, where the amplitude of the pulse current is greater than the first amplitude, and return the motor to a steady state holding current following the conclusion of the pulse current. | 08-02-2012 |
20120313565 | System and method for providing control of an electric motor using inductive rotary sensor - A sensor system for providing control of an electric motor having an inductive angle sensor system including a first inductive coil configured for affixation to a rotor shaft of the electric motor wherein rotation of the rotor shaft causes corresponding rotation of the first inductive coil. A second inductive coil fixedly mounted in spaced relationship to the first inductive coil. An evaluation circuit coupled to the second inductive coil and to the electric motor operative to determine a rotor shaft angle for the rotor shaft of the electric motor through evaluation of an induced magnetic field between the first and second inductive coils. | 12-13-2012 |
20130234642 | MOTOR CONTROL DEVICE - A motor control device that controls motion of a control target including a motor and a vibratable element includes a generating unit configured to generate, according to state information representing a state of the control target related to a vibration characteristic of the control target, a first parameter representing the vibration characteristic of the control target, a first calculating unit configured to calculate a second parameter corresponding to a temporal change amount of the first parameter generated by the generating unit, a second calculating unit configured to calculate, using a motion target value, the first parameter, and the second parameter, model torque such that the control target does not excite vibration, and a developing unit configured to develop, according to the model torque calculated by the second calculating unit, a torque command such that the motion of the control target follows the motion target value. | 09-12-2013 |
20140117918 | ROBUST CONTROLLER FOR ELECTRO-MECHANICAL ACTUATORS EMPLOYING SLIDING AND SECOND CONTROL MODES - An improved technique for controlling an electro-mechanical actuator combines a sliding mode of control with a second mode of control. An error signal is generated based on the difference between an input position signal and a feedback position signal. When the error signal is above a predetermined threshold, the actuator is controlled in the sliding control mode. When the error signal is below the predetermined threshold, the actuator is controlled in the second control mode. The combination of the sliding control mode with the second control mode yields a robust controller that can tolerate large parameter variations and uncertainties without sacrificing precise steady state tracking. | 05-01-2014 |
20140117919 | SERVO CONTROL DEVICE - A servo control device includes a follow-up control unit that controls a control target that drives a mechanical system by a motor, a command function unit that has input therein a phase signal θ indicating a phase of a cyclic operation performed by the control target, and that calculates a machine motion command according to the phase signal θ by a preset first function, a second derivative unit that uses a second function obtained by second-order differentiating the first function with respect to the phase signal to calculate a value of the second function according to the phase signal as a second-order differential base signal, a correction-value computation unit that computes a first command correction value for correcting the motor motion command by using a product of a square value of the phase velocity, the second-order differential base signal, and a first constant, and a correction-value addition unit that calculates the motor motion command based on an added value of the first command correction value and the machine motion command. | 05-01-2014 |
20140217952 | Position Control Apparatus - A position control apparatus is configured to perform full-closed control for controlling the position of a driven member. The position control apparatus includes a vibration period and amplitude detector that detects a vibration period and a vibration amplitude included in a difference value between the position command value and the driven member position detection value. The position control apparatus also includes a constant vibration detector that outputs, as a vibration period of the constant vibration, a vibration period obtained while the driven member is not in an acceleration/deceleration state and the vibration period and the vibration amplitude detected by the vibration period and amplitude detector are equal to or greater than a vibration period threshold value and a vibration amplitude threshold value, respectively. The position control apparatus also includes a control parameter changer that changes the control parameter based on the vibration period output from the constant vibration detector. | 08-07-2014 |
20140292249 | CONTROL TECHNIQUES FOR MOTOR DRIVEN SYSTEMS - Embodiments of the present invention provide a motor-driven mechanical system with a detection system to measure properties of a back channel and derive oscillatory characteristics of the mechanical system. Uses of the detection system may include calculating the resonant frequency of the mechanical system and a threshold drive D | 10-02-2014 |
20150077032 | SINGLE DEGREE OF FREEDOM VIBRATION ISOLATING DEVICE OF LINEAR MOTOR AND MOTION CONTROL METHOD THEREOF - A single degree of freedom vibration isolating device of a linear motor and a motion control method thereof. The vibration isolating device comprises a balance block, an anti-drifting driving unit, and a control unit. An upper surface of the balance block is connected to a stator of the linear motor, and a lower surface of the balance block is connected to a base. The anti-drifting driving unit is connected to the balance block for controlling the position of the balance block. Provided two motion control methods; inputting a second grating ruler signal to the control unit as feedback to perform variable stiffness and nonlinear control on the balance block; inputting a first and a second grating ruler signal to the control unit as feedback to obtain resultant centroid displacement signals of the rotor and the balance block to perform nonlinear anti-drifting control on the balance block. | 03-19-2015 |
20150145465 | SERVO CONTROLLER HAVING FUNCTION FOR REDUCING DROPPING WHEN BRAKING - A servo controller having a function for reducing an amount of dropping of a gravity axis provided with a machine. The Servo controller is configured to control a servomotor for driving a gravity axis of the machine, and includes a brake signal outputting part configured to output a brake activation signal and a brake release signal to a mechanical brake for holding the gravity axis; a torque command generating part which generates a torque command value for controlling the position of the servomotor; and a torque limiting value generating part which generates a torque limiting value for limiting the torque command value. The torque limiting value generating part continuously reduces the torque limiting value from a first value larger than a torque corresponding to the gravity force to a second value smaller than the torque corresponding to the gravity force, after the brake activation signal is output. | 05-28-2015 |
20160252896 | MOTOR CONTROLLER HAVING A FUNCTION OF SUPPRESSING VIBRATIONS | 09-01-2016 |
318615000 | By auxiliary feedback loop | 8 |
20100207566 | CONTROL DEVICE FOR SERVO DIE CUSHION - A control device, for a servo die cushion, capable of improving a response after overshoot generated by collision of a slide and a die cushion. The control device has a local maximum point judging part which judges a local maximum point based on the detected speed of the servomotor; a speed correction value calculating part which calculates a speed correction value for the servomotor based on the judgment result and the detected speed of the slide; a second force commanding part which generates a second force command value, the second force command value decreasing from an initial value to a first force command value, the initial value being equal to the force detected value when reaching generally the local maximum point. The force command value is switched from the first force command value to the second force command value, when the force detected value reaches the local maximum point. | 08-19-2010 |
20120007540 | MOTOR CONTROL DEVICE - Provided is a motor control device which realizes automatic adjustment of control of a motor for driving a mechanical load through a simple operation. The motor control device includes: a follow-up control unit ( | 01-12-2012 |
20120187891 | POSITIONING CONTROL DEVICE - In positioning control of a machine in which residual vibrations are caused due to a low mechanical rigidity, residual vibrations are suppressed within an allowable positioning error, and a positioning time period required for the positioning control is shortened. | 07-26-2012 |
20120194121 | POSITION CONTROL APPARATUS - A position control apparatus calculates a position detection value by adding an output of a first-order delay circuit | 08-02-2012 |
20130049671 | Base Vibration Attenuation and Load Tracking in Mechanical Systems - A hybrid controller for a mechanical system includes an actuator configured to position a load. A vibration attenuation controller produces a vibration attenuation control signal in response to an input signal for the mechanical system. A tracking controller configured produces a tracking control signal in response to the input signal. In response to an output signal from the mechanical system, either the vibration attenuation control signal or the tracking control signal is switched as a control signal for the mechanical system to reduce both vibration in the mechanical system and improve tracking the load. | 02-28-2013 |
20140176036 | MOTOR CONTROL APPARATUS AND MOTOR CONTROL METHOD - A motor control apparatus includes a state quantity detector configured to output a detection signal in correspondence with a state quantity of a motor, a vibration detection unit configured to detect a disturbance vibration component of the motor based on a torque instruction and the detection signal and output a vibrational component signal in correspondence with the detection result, a speed signal generator configured to generate a speed signal based on a result of subtracting the vibration component signal from the detection signal, and a speed controller configured to generate the torque instruction based on a deviation between a speed instruction and the speed signal. | 06-26-2014 |
20180024572 | MOTOR CONTROLLER AND INDUSTRIAL MACHINE | 01-25-2018 |
318616000 | Rate feedback | 1 |
20130229137 | POSITION CONTROL DEVICE FOR ELECTRIC MOTOR - Position control device for electric motor inputs deviation signal between angle command and angle detection value to position control section and calculates angular velocity command, inputs deviation signal between this angular velocity command and angular velocity detection value to speed control section and calculates torque current command, and controls, according to this torque current command, the electric motor current control section. The Position control device has disturbance observer section which inputs the torque current command and the angular velocity detection value and estimates signal corresponding to disturbance torque; rate-of-change limitation section which has limiter inputting disturbance observer output value by this disturbance observer section and performing rate-of-change limitation of upper and lower limit values of the angle command; and target value filter section which is configured by control gain equivalent to the speed control section and through which the angular velocity command from the position control section passes. | 09-05-2013 |
318619000 | Variable gain bandwidth | 15 |
20080309279 | MOTOR CONTROLLER - A motor controller includes: a notch filter arranged inside a control system; an oscillation frequency estimating section which estimates an oscillation frequency component in a motor; and a notch control section which controls a notch filter so as to change a notch frequency and a notch width. The notch control section changes a frequency between an oscillation frequency and a notch frequency set in a notch filter as a new notch frequency, while changing a notch width to a new notch width such that the notch width is larger after the change than before the change. | 12-18-2008 |
20090009128 | CONTROL APPARATUS - A control apparatus of the present invention comprising a control unit outputting a control signal controlling a servo motor and suppressing natural vibration of a controlled object including a motor and a machine driven by the motor while controlling the controlled object, comprising a frequency analysis unit analyzing a frequency component included in a torque command, an analysis control unit controlling the start or stopping of the frequency analysis unit, a detection unit detecting a natural frequency of the controlled object from an analysis result of the frequency analysis unit, a-band rejection filter receiving as input the torque command, stripping the command of the natural frequency component, and outputting the resultant command to the motor through a current control unit and servo amplifier, and a filter characteristic setting unit setting the frequency to be stripped at the filter based on the natural frequency detected by the detection unit. | 01-08-2009 |
20090230912 | MOTOR CONTROLLER - A motor controller includes a command part that generates a command signal, a control part that drives a control object through an output filter when the command signal is input, an operating amount detector that detects an operating amount of the control object, a frequency response characteristic measurement part that generates an open loop frequency response characteristic on the basis of the command signal and the operating amount, a model calculation part that simulates a frequency characteristic of the output filter, and a display that displays the add result of an amplitude characteristic of the frequency characteristic of the frequency response characteristic measurement part and an amplitude characteristic of the frequency characteristic of the model calculation part. | 09-17-2009 |
20090322275 | METHOD AND APPARATUS FOR IMPROVING THE POSITION ACCURACY OF A SERVO MOTOR - A method of operating a motor controlled by a closed loop servo control system is provided. The closed loop servo control system employs a digital filter, such as a PID filter, that employs one or more gain coefficients. The method includes temporarily increasing one or more of the gain coefficients by a corresponding first predetermined amount when the motor reaches a coefficient boost motor position that is a predetermined distance before a commanded motor rest position, and decreasing the one or more of the gain coefficients by a corresponding second predetermined amount a predetermined time after the motor reaches the commanded motor rest position. | 12-31-2009 |
20100052594 | MACHINE CONTROL DEVICE - A machine control device has a position regulator configured to enable modification of the proportional gain during regulation operations, and has proportional gain setting unit, which sends an instruction to modify the proportional gain to the position regulator based on a position instruction value which is an output of a position instruction unit. In the proportional gain setting unit, when the movement velocity based on the position instruction value from the position instruction unit decreases, that is, when the position instruction value is a value at which the movement distance is short, the proportional gain of the position regulator is set high, and when the movement velocity based on the position instruction value increases, that is, when the position instruction value is a value at which the movement distance is long, the proportional gain is set low. | 03-04-2010 |
20110221378 | MOTOR CONTROLLER - There are provided: a plurality of notch filters which are arranged inside a control system for feedback-controlling a moving operation of a moving section of a motor and attenuate signal components having near frequencies with a notch frequency at a center in an input signal; a plurality of oscillation extracting filters which are set with different frequency bands as being corresponded to the respective notch filters and extract oscillating components in the set frequency bands from a speed detection signal; and a plurality of notch controlling sections which are arranged with respect to the respective oscillation extracting filters and control the notch frequencies of the corresponding notch filters so as to decrease amplitudes of the oscillating components extracted by the oscillation extracting filters. | 09-15-2011 |
20120161687 | MOTOR DRIVE CIRCUIT - A motor-drive circuit includes: a filter circuit to attenuate a frequency band including a resonance frequency of an actuator in a target-current signal, the target-current signal corresponding to a digital signal indicative of a target value of a driving current; a digital-analog converter to convert an output signal of the filter circuit into an analog signal, to be outputted as a current-control signal; and a driving circuit to supply the driving current to the voice-coil motor in accordance with the current-control signal, the filter circuit including: a digital notch filter; and a digital low-pass filter, wherein either one of the digital notch filter and the digital low-pass filter configured to be inputted with the target-current signal, the other one of the digital notch filter and the digital low-pass filter configured to be inputted with an output signal of the one of the digital notch filter or the digital low-pass filter. | 06-28-2012 |
20120268054 | SERVO MOTOR CONTROL APPARATUS AND CONTROL METHOD - A servo motor control apparatus has a feedback loop. When an oscillation detection signal indicates no detection of oscillation, a parameter operating section gives an updating section an operational instruction to set a control parameter in accordance with a supplied set value. When the oscillation detection signal indicates detection of oscillation, the parameter operating section gives the updating section an operational instruction to set such a control parameter as to narrow a frequency band width of the feedback loop. | 10-25-2012 |
20130099719 | MACHINE TOOL - A machine tool includes a main axis | 04-25-2013 |
20130113409 | MOTOR CONTROLLER - There are provided: a plurality of notch filters which are arranged inside a control system for feedback-controlling a moving operation of a moving section of a motor and attenuate signal components having near frequencies with a notch frequency at a center in an input signal; a plurality of oscillation extracting filters which are set with different frequency bands as being corresponded to the respective notch filters and extract oscillating components in the set frequency bands from a speed detection signal; and a plurality of notch controlling sections which are arranged with respect to the respective oscillation extracting filters and control the notch frequencies of the corresponding notch filters so as to decrease amplitudes of the oscillating components extracted by the oscillation extracting filters. | 05-09-2013 |
20140292250 | HOST CONTROLLER GENERATING POSITION CONTROL GAIN - A reference value generating unit ( | 10-02-2014 |
20140333249 | MOTOR CONTROL DEVICE FOR SUPPRESSING NATURAL VIBRATIONS - A frequency component extracting unit ( | 11-13-2014 |
20150028789 | Motor Drive Control and Operating Method Therefor - A digital control section generates a digital drive voltage command signal in response to a digital drive current command value and to a drive current digital sensing signal. A digital-to-analog converter generates an analog drive voltage command signal from the digital drive voltage command signal. In response to the analog drive voltage command signal, a driver output section drives a motor and a sensing resistor. If the digital drive current command value is between a positive threshold voltage and a negative threshold voltage, the computation section generates an internal control signal that is in a first state “1”, and exercises control to place the gain of the drive current sensing amplifier in a first state “H”. If not, the computation section exercises control to place the gain of the drive current sensing amplifier in a second state “L”, namely, in a low state. | 01-29-2015 |
20160116896 | NUMERICAL CONTROL DEVICE - A numerical control device for controlling a motor includes a stopping unit configured to stop the motor using position control gain for emergency stop corresponding to emergency stop command, wherein emergency stop of the motor is performed with position control. | 04-28-2016 |
20160124417 | AUTOMATIC GAIN ADJUSTMENT SUPPORT DEVICE - An automatic gain adjustment support device according to this invention supports automatic adjustment of a control gain in a control loop for a servomotor controller which controls a servomotor. The automatic gain adjustment support device includes a frequency characteristic measuring unit, a display unit, a condition setting unit, an automatic gain adjusting unit, and a parameter setting unit. The frequency characteristic measuring unit measures frequency characteristics of the control loop in the servomotor controller. The display unit displays, in Bode diagram form, the frequency characteristics of the control loop. The condition setting unit sets a target gain value at a predetermined frequency. The automatic gain adjusting unit automatically adjusts the control gain in the control loop to the target gain value at the predetermined frequency set by the condition setting unit. The parameter setting unit sets the control gain to the servomotor controller. | 05-05-2016 |
318620000 | Nonlinear circuits | 1 |
20140203752 | POSITIONING CONTROL SYSTEM FOR ACTUATOR PROVIDED WITH WAVE GEAR DEVICE - A positioning control system for an actuator provided with a strain wave gearing is provided with: a semi-closed feedback controller FB(s) that controls a load shaft position θ | 07-24-2014 |
318621000 | Lead or lag networks | 5 |
20090284208 | MACHINE POSITION CONTROL DEVICE - Even when rigidity of a load drive system using a motor is relatively low, by performing a load position control in which a load position signal is fed back as stable as a semi-closed control system in which only a motor position signal is fed back, an accurate load position control can be made possible. Therefore, regarding a load position signal x | 11-19-2009 |
20100127655 | 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 substantially changing the effect of the lead compensation in the control system's frequency response. | 05-27-2010 |
20120007541 | MOTOR CONTROL APPARATUS - A motor control apparatus includes a sub-controller including a two-degree-of-freedom repetitive compensator and a shaping filter. The two-degree-of-freedom repetitive compensator includes a forward delay placed in a forward route of a loop and a feedback delay placed in a feedback route thereof and is configured so that a total delay time provided by the forward delay and the feedback delay is equal to the cycle of a target command or a disturbance. The shaping filter is configured so that the product of the pulse transfer function of the two-degree-of-freedom repetitive compensator and the complementary sensitivity function of a general-purpose control system has a low-pass characteristic. | 01-12-2012 |
20120146570 | 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 substantially changing the effect of the lead compensation in the control system's frequency response. | 06-14-2012 |
318622000 | A.C. networks | 1 |
20080224646 | Open loop method for controlling power - Aspects of the present invention pertain to a method of power control for an electrical motor using open-loop principles. 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 with a motor drive signal at a given load for a first number of cycles to detect the phase lag of the motor drive signal. Controlling for phase lag for a second number of cycles is then accomplished by firing a thyristor according to the phase lag of the motor drive signal. | 09-18-2008 |
318623000 | Load stabilization (e.g., viscous, magnetic or friction dampers) | 1 |
20090261773 | GALVANO MOTOR AND GALVANO MOTOR SYSTEM - A galvano motor | 10-22-2009 |
318624000 | By deadband at null (e.g., threshold circuits) | 3 |
20110043159 | SERVO MOTOR POSITION CONTROL DEVICE - Provided is a technique to suppress hunting in a range of a minimum resolution of a pulse encoder when a servo motor has reached a target position and stopped, thereby maintaining a stable stop state. A servo motor position control device uses a cascade configuration having a position control loop as a main loop and a velocity and current control loop as a minor loop. A proportion control is performed for a position control while a proportion integration control is performed for a velocity control and a current control. When the servo motor position has reached the target position and stopped (S | 02-24-2011 |
20130106336 | MOTOR CONTROL APPARATUS EQUIPPED WITH DEAD-ZONE PROCESSING UNIT | 05-02-2013 |
20160085217 | ACTIVE DEAD BAND FOR NOISE REDUCTION IN HIGH RESPONSE HIGH BANDWIDTH CONTROL SYSTEMS - A control system comprises an active dead band, coupled to a feedback path of the control system, configured to receive a first signal derived from a motor position signal of the feedback path of the control system and a utilize, in accordance with the signal, a set of thresholds to prevent feedback noise within a driveline of the control system. | 03-24-2016 |