Class / Patent application number | Description | Number of patent applications / Date published |
318609000 | "Reset" systems (P.I.) | 15 |
20080211445 | AIRCRAFT CABIN PRESSURE CONTROLS: DUTY CYCLE OFFSET TO COMPENSATE FOR ASYMMETRIC MOTOR LOADING IN AN OPEN-LOOP MOTOR CONTROL SYSTEM - A cabin pressure control system (CPCS) software control logic modification may boost the voltage applied to a motor by applying a duty cycle offset to compensate for asymmetric motor loading. The motor may be part of an open-loop system for operating a butterfly valve that may regulate outflow from the aircraft cabin. In CPCS applications, the loading on the butterfly valve is unidirectional due to a mechanical spring and pneumatic loading, thus, causing asymmetric loading to the motor. By boosting the motor voltage when the motor is required to act against the asymmetric load, CPCS performance and robustness may be improved. | 09-04-2008 |
20080265823 | Stator resistance adaptation in sensorless PMSM drives - A method of estimating stator resistance of a permanent magnet synchronous machine, when the permanent magnet synchronous machine is controlled with an inverter using a control system having an adaptive observer which is augmented with a signal injection, the adaptive observer having a stator resistance estimate ({circumflex over (R)} | 10-30-2008 |
20090251092 | POSITION CONTROLLER - A position controller includes a position control part that calculates a speed command on the basis of a difference between a position command and a rotation position of a motor, a PI control part that calculates a torque command on the basis of a speed difference between the speed command and a feedback speed, an observer that generates the feedback speed on the basis of the torque command and a rotation speed of the motor, a phase lead compensator that generates a phase lead compensation signal of the torque command on the basis of the speed command, and an adder that generates a new torque command by adding the phase lead compensation signal of the torque command to the torque command. | 10-08-2009 |
20100231158 | SERVER CONTROLLER AND A METHOD FOR CONTROLLING A PLURALITY OF MOTORS - Servo controller for controlling a plurality of motors including a master motor and a slave motor cooperatively driving a movable member. The servo controller is configured to control the master motor and the slave motor based on position references for the master motor. The servo controller includes a master speed controller configured to calculate a reference torque for the master motor based on speed errors for the master motor. The slave speed controller is configured to calculate reference torques for the slave motor based on speed errors for the slave motor. Each of the reference torques includes a proportional torque part and an integral torque part. The servo controller is configured to calculate each of the integral torque parts based on the speed errors of the master motor and the speed errors of the slave motor, such that the torques due to the integral torque parts will be distributed equally between the master and slave motors or according to a predefined ratio. | 09-16-2010 |
20120306426 | MOTOR CONTROL DEVICE - A motor control device includes: a feedforward computing section for computing a motion reference value and a feedforward driving force based on a motion command; a deviation compensation computing section for outputting a deviation compensation driving force by a control computation for reducing a control deviation; a driving-force command synthesizing section for outputting a driving-force command based on the feedforward driving force and the deviation compensation driving force; a reaction-force compensation computing section for computing a motion correction value based on a predetermined reaction-force reference value and the deviation compensation driving force; and a control-deviation computing section for computing the control deviation based on a deviation between the motion reference value and a motor motion detection value, and the motion correction value. | 12-06-2012 |
20130214718 | MOTOR CONTROL DEVICE - A motor control device includes a feedback filter that has filter characteristics that a frequency response gain is substantially one at frequencies equal to or lower than a filter cutoff frequency, a frequency response gain decreases with increase in frequency in a range from the filter cutoff frequency ωfL to a filter upper limit frequency ωfH higher than the filter cutoff frequency ωfL, and a frequency response gain is substantially constant at frequencies equal to or higher than the filter upper limit frequency ωfH, and performs computing to apply the filter characteristics to a feedback transfer function, wherein a control-constant set unit sets a speed gain Kv and at least one of the filter cutoff frequency ωfL and the filter upper limit frequency ωfH to reduce a ratio of the filter upper limit frequency ωfH to the filter cutoff frequency ωfL with increase in the speed gain Kv. | 08-22-2013 |
20130241461 | SINUSOIDAL MODULATION CONTROL METHODS AND CIRCUITS FOR PERMANENT MAGNET SYNCHRONOUS MOTORS - Disclosed herein are sinusoidal modulation control methods and circuits for PMSM. In one embodiment, a method can include: detecting rotor position information of the PMSM to obtain a rotor position signal and a rotor rotating speed measured value; comparing the rotating speed measured value against a reference rotating speed value to generate an error signal, and generating a first regulating voltage signal based on the error signal using a PI regulator; receiving the rotor position signal and the first regulating voltage signal, and generating a full-wave U-shaped modulation wave by using the rotor position signal as a time reference; generating a second U-shaped modulation wave by multiplying the full-wave U-shaped modulation wave with the first regulating voltage signal; comparing the second U-shaped modulation wave against a triangular wave to generate a PWM control signal that controls a switch of an inverter to regulate a current of the PMSM. | 09-19-2013 |
318610000 | With rate (P. I. D.) (e.g., reset windup prevention) | 8 |
20090108793 | METHOD FOR CONTROLLING A HOLDING FORCE AGAINST, AND LIMITING IMPACT WITH TRAVEL LIMIT POSITIONS - An actuator includes a motor operated by a controller through a pulse width modulation drive signal applied to a drive circuit that drives the motor. The actuator has an output shaft connected to a coupling structure for manipulating a device such as a variable geometry turbine (VGT) or an exhaust gas recirculation (EGR) valve. The device has a range of motion limited by first and second mechanical stops located at opposing low and high ends of the range. The controller learns the location of the mechanical stops during calibration. An external control unit transmits a desired position to the actuator. A protocol allows the external control unit to implicitly request a positioning mode by virtue of what value range the desired position falls into. The controller is configured to limit the drive signal to a non-harmful level when one of the positioning modes calls for pushing the device against one of the stops. | 04-30-2009 |
20090167231 | System and method for controlling electric motors to simulate a mechanical differential - System and methods of controlling a plurality of motors based on a motor motion attribute, such as rotor position, velocity, or acceleration, which simulate the properties of a mechanical differential, including a pure differential, a limited slip differential, and/or a locking differential. The method may be employed in a number of applications, including, without limitation, a paper handling system, such as an inserter, to control the nips of a pinless cutter of an inserter, and in a vehicle. | 07-02-2009 |
20100156336 | LOW SPEED CONTROL METHOD AND APPARATUS FOR SERVO MOTOR - A low speed control method and an apparatus for a servo motor. The control apparatus comprises: an encoder capable of acquiring a speed signal from a servo motor and encoding the speed signal to output a low-resolution encoded signal; an insertion calculation unit capable of receiving the low-resolution encoded signal from the encoder to be processed by an interpolation operation for converting the low-resolution encoded signal into a high-resolution encoded signal to be outputted therefrom; a servo control chip capable of setting internal parameters and receiving the high-resolution encoded signal from the insertion calculation unit to be processed by a calculation process so as to output a switch control instruction; and a power module capable of receiving the switch control instruction from the servo control chip and then transmitting the same to the servo motor for adjusting the operation speed of the servo motor. | 06-24-2010 |
20120001582 | CONTROLLER FOR ACTUATION SYSTEM EMPLOYING KALMAN ESTIMATOR INCORPORATING EFFECT OF SYSTEM STRUCTURAL STIFFNESS - A controller for an electro-mechanical actuation system such as a missile fin actuator includes a Kalman estimator circuit which generates an estimate of operating state including position and velocity of motor, position and velocity of a position-controlled element (PCE), and motor current. The estimate is generated based on a dynamic model explicitly including the effect of structural stiffness and damping in the coupling between the motor and the PCE, for example by treating it as a mechanical oscillator having spring and damping constants. The Kalman estimator operates on a motor drive control signal and a measured position signal which may be from a Hall sensor sensing motor position. A linear quadratic regulator circuit generates a control effort signal by applying a state feedback gain matrix to a state vector. The state feedback gain matrix minimizes a quadratic cost function representing variance of the control effort signal and/or the measured position signal. | 01-05-2012 |
20120153885 | CONTROL SYSTEM - A control system may be switched between a Pseudo-Derivative Feedforward (PDFF) control manner and a Proportional Integral (PI) control manner. The control system includes a first operational element, a second operational element, a feedback proportion controller, an integrator, and a feedforward proportion controller. The first operational element and the second operational element are used to perform calculation of addition or subtraction on an input signal, a feedback signal, and a feedforward signal. The integrator generates an integral signal. The feedback proportion controller generates a feedback proportion signal according to a first feedback gain or a second feedback gain. The feedforward proportion controller generates a feedforward proportion signal according to a first feedforward gain or a second feedforward gain. The control system may be switched among the different control manners through selection among the first feedback gain, the second feedback gain, the first feedforward gain, and the second feedforward gain. | 06-21-2012 |
20120217923 | System for Controlling a Motor - A control system for a motor includes a current regulation controller for generating a terminal voltage command. The terminal voltage command is used for converting a supply voltage to a three phase voltage to power a motor. The control system also includes a terminal voltage command feedback module for controlling the terminal voltage command. The terminal voltage command feedback module compares the terminal voltage command to a determined voltage limit of the supply voltage and generates a d-axis current adjustment command in accordance with the comparison. The d-axis current adjustment command is used for reducing the terminal voltage command below the determined voltage limit. The control system also includes a summer coupled with the terminal voltage command feedback module. The summer adds the d-axis current adjustment command to a d-axis current command received from a lookup table. | 08-30-2012 |
20130300336 | POSITION CONTROL SYSTEM - The invention provides a position control system comprising a moving portion that is movable, a position-detection portion that detects a position of the moving portion, a drive portion that applies driving force to the moving portion thereby moving the moving portion, a control portion that controls the driving force of the drive portion, and an input portion for inputting a drive target position for the moving portion, characterized in that the control portion is operable to determine the driving force to be applied to the drive portion based on a correction coefficient acquired based on a first deviation that is a difference between the drive target position inputted into the input portion and the reference position, and a second deviation that is a difference between a position detected by the position-detection portion and the drive target position inputted into said input portion. | 11-14-2013 |
20140055074 | MOTOR CONTROL DEVICE - A motor control device according to an embodiment includes a first subtractor, a speed controller, and a phase compensating speed observer. The first subtractor subtracts a speed reference from a speed feedback signal to obtain a speed deviation. The speed controller receives the speed deviation and outputs a first torque reference. The phase compensating speed observer receives the first torque reference and a speed of a controlled object including a motor, and outputs the speed feedback signal. The phase compensating speed observer includes a delay element model having an integral element of an order optimally satisfying a setting condition based on a degree of easiness for implementation and a degree of usefulness for phase delay compensation of the speed feedback signal to the speed reference. | 02-27-2014 |