| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 318638000 | With particular "error-detecting" means | 82 |
| 20080284365 | 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. | 11-20-2008 |
| 20120306427 | DRIVING APPARATUS, CAMERA PLATFORM APPARATUS AND LENS APPARATUS INCLUDING THE DRIVING APPARATUS, AND DRIVING METHOD OF CONTROLLING THE DRIVING APPARATUS - The driving apparatus includes: driving unit driving driven unit; controller controlling the driving unit; portion to be detected in which first areas and second areas are arranged alternately; and detector that detects the first and second areas. The portion includes, on one side of base position in a moving direction, first areas having small width and second areas having different widths larger than the first areas on the one side, and includes, on the other side, second areas having small width and first areas having different widths larger than the second areas on the other side. When moving the driven unit to specific position, the driven unit is driven in direction determined according to an area detected by the detector when starting the operation, and reverses the direction if the driven unit is moved by a predetermined amount or larger in the area after the detection area is changed. | 12-06-2012 |
| 20130026965 | SIGNAL PROCESSOR, ENCODER, AND MOTOR SYSTEM - A signal processor includes an AD converter that converts a periodic analog signal output from a detector in accordance with a position Q of a motor to a digital signal at a predetermined conversion period, a tracking circuit that calculates a position P of the motor at an arithmetic period on the basis of the digital signal that is converted and output at the conversion period by the AD converter, an operation state identifier that identifies an operation state of the motor on the basis of the position P of the motor calculated by the tracking circuit, and an arithmetic period determiner that changes the arithmetic period of the tracking circuit in accordance with the operation state of the motor identified by the operation state identifier such that the position P of the motor calculated by the tracking circuit follows the actual position Q of the motor. | 01-31-2013 |
| 20130154539 | METHOD AND DEVICE FOR OPERATING AN ACTUATOR WITH A BRUSHLESS ELECTRIC MOTOR - An actuator system for operating a flap valve in a motor vehicle, comprising: a drive system having an electronically commutated electric motor; a movable actuating member; a mechanism that couples the drive system to the actuating member so that a displacement of the actuating member is brought about upon activation of the drive system; a position sensor for sensing a position of the actuating member on the actuating member or in the mechanism, and for making available a corresponding position indication; a control unit to activate the drive system to move the actuating member, the electric motor of the drive system being electronically commutated, the control unit being configured to make available to the electric motor, in order to move the actuating member, activation signals dependent on the position indication made available, which signals bring about a predefined drive torque or a predefined rotation speed of the electric motor. | 06-20-2013 |
| 318639000 | Plural, diverse conditions | 6 |
| 20090058348 | MOTOR DRIVE CONTROL DEVICE AND IMAGE FORMING APPARATUS - A motor drive control device for controlling a rotational speed of a motor includes: a motor driver for rotationally driving a motor; a correction amount calculating section for detecting a rotational speed of an output of the motor in accordance with an alternate current signal outputted from an FG sensor and detecting a rotational position of a photoconductive drum, which is rotated by a rotational drive force of the motor, in accordance with a pulse outputted from an encoder; a speed controller for generating a speed control signal corresponding to a total correction amount, which is a sum of a correction amount calculated in the correction amount calculating section based on a rotational speed of the motor and a correction amount calculated based on a rotational position of the photoconductive drum, and outputting the generated speed control signal to the motor driver. | 03-05-2009 |
| 20110279077 | APPARATUS EQUIPPED WITH MOTOR - An apparatus includes a driven member, a DC brushless motor, a first signal generation unit configured to output a first signal according to rotation of the DC brushless motor and to change an output value of the first signal each time the DC brushless motor rotates by a predetermined amount, a movement unit configured to move the driven member by a driving force of the DC brushless motor, a second signal generation unit configured to output a second signal each time the driven member moves by the predetermined amount, and a control unit configured to control driving of the DC brushless motor based on the output value of the first signal and a value of a number of times that the second signal is output during a period in which the DC brushless motor rotates by a predetermined amount. | 11-17-2011 |
| 20120098476 | FEEDBACK SWITCHING DEVICE AND METHOD FOR DRIVING OF SERVO MOTOR - A feedback switching device and a method allow a drive control loop for a servo motor to actively switch the feedback mode in accordance with the rotating speed of the servo motor. When the servo motor is under a high speed operation, a sensorless position estimation feedback technology is used as the feedback mode; on the other hand, when the servo motor is under a low speed operation, the switching mode is automatically switched to a position sensing feedback technology. Therefore, the development needs for multi-function, high performance and low cost in the field of the servo motor control are met, and the conventional problem is solved that, when being applied to a servo driving system having a wide speed range, the single use of the position sensing feedback technology or the sensorless position estimation feedback technology fails to satisfy the application for a wide speed range. | 04-26-2012 |
| 20130234643 | SPINDLE POSITIONING DEVICE - An acceleration command calculator | 09-12-2013 |
| 20140132195 | ELECTRIC BOOSTER CONTROL APPARATUS AND METHOD - Disclosed herein are an apparatus and method for control of an electric booster. The apparatus includes a sensing unit to sense information about at least one of displacement and velocity variation of a ball screw, a control unit to receive the information, the control unit including a preset range of reference Wall Pattern position and reference Wall Pattern velocity, a determination unit to determine whether the information is within at least one of the range of reference Wall Pattern position and the range of reference Wall Pattern velocity, and a ball screw initial position setting unit to set a current position of the ball screw contacting a rear wall of the master cylinder to an initial position of the ball screw when it is determined that the information is within the range of reference Wall Pattern position and the range of reference Wall Pattern velocity. | 05-15-2014 |
| 20140354209 | MACHINE TOOL AND CONTROL METHOD THEREFOR - A machine tool according to an embodiment includes a drive mechanism configured to move a control target; a motor configured to operate the drive mechanism; a first encoder configured to detect a position of the control target; a second encoder configured to detect a position of the motor; a servo control unit configured to control the motor; and a numerical control unit configured to receive or calculate an error between the position of the control target obtained from a detection result of the first encoder and a position of the control target obtained from a detection result of the second encoder from the servo control unit, and to estimate a transmission error of the drive mechanism based on a change amount of the error between before and after inversion of a moving direction of the control target. | 12-04-2014 |
| 318640000 | Photoelectric or optical-type measuring instruments | 22 |
| 20090033270 | Position Feedback Device for a Motor - A position feedback device for a motor comprises a driven member and a sensing device. The driven member is indirectly connected to the motor and driven by it. The sensing device detects the travel length of the motor by sensing the driven member. With the method of indirectly sensing the motor, the measurement error, production cost can be reduced, and the assembling position is flexible. | 02-05-2009 |
| 20090033271 | MACHINE TOOL HAVING FUNCTION OF CORRECTING MOUNTING ERROR THROUGH CONTACT DETECTION - A machine tool capable of automatically correcting an orientation of a workpiece or machining attachment based on detection results from position detectors that the machine tool inherently has. The machine tool comprises: position detectors; position deviation determining means; contact detection means that detects a contact between a probe and a surface of the workpiece or the machining attachment based on a position deviation; movable axis stopping means; coordinate value detection means; inclination determining means; and correction means. The inclination determining means moves linear axes to perform detection of contacts between the probe and the surface of the workpiece or the machining attachment at least two different points, and determines an inclination of the workpiece or the machining attachment using the obtained coordinate values. The correction means corrects a mounting error of the workpiece or the machining attachment, or corrects the machining program based on the determined inclination. | 02-05-2009 |
| 20090184676 | METHOD AND APPARATUS FOR POSITION-ACCURATE TRIGGERING OF A MACHINE PART - A machine part, such as a laser, is moved along at least one axis of movement relative to a workpiece. Position pulses are generated by means of an incremental encoder, with the number of position pulses in a position pulse train being representative of the movement position of the machine part. A trigger signal for the machine part is generated when the current number of position pulses corresponds to a predefined number of pulses. In a preferred embodiment, the current number of position pulses and the defined number of pulses are compared remote from a higher-level drive control circuit. It is particularly preferred if the current number of position pulses and the defined number of pulses are compared in a comparator which is arranged on an interface card of a computer unit, with the drive control circuit for controlling the movement of the machine part being implemented with a closed loop controller in the form of a controller program, which is cyclically executed by a central processor of the computer unit. | 07-23-2009 |
| 20100052596 | ULTRASONIC MOTORIZED STAGE - An ultrasonic motorized stage includes a base part, first and second tables, first and second linear ultrasonic motors which respectively drive the first and the second tables, and first and second optical linear sensors which respectively detect the amount of move of the first and the second tables. The first and the second linear ultrasonic motors and the first and the second optical linear sensors are arranged in positions, which are at sides other than the front side of the ultrasonic motorized stage and prevent wear debris generated when the first and/or the second linear ultrasonic motor is driven from affecting the first and the second optical linear sensors, so that the first and the second linear ultrasonic motors and the first and the second optical linear sensors do not protrude upward from the upper surface of the second table. | 03-04-2010 |
| 20100072937 | MOBILE POSITIONING STRUCTURE FOR AN AXIAL ROD MOTOR - A mobile positioning structure for an axial rod motor comprises a base on which being disposed a stator, and on the stator is disposed a mover on which being mounted an optical signal reader. The stator is provided with a plurality of measurement marks. The position of the mover on the stator is read by the cooperation of an optical reader and measurement marks, such an optical signal reading method is not affected by the magnetic field. Hence, the data detected will be more accurate with less error. | 03-25-2010 |
| 20100072938 | Encoder Eccentricity Correction for Motion Control Systems - Correction of rotary encoder eccentricity in an image forming device having a motor controller using period and position pulse train feedback signals. A motor includes an encoder disc rotating with the motor and at least two encoder sensors disposed at different circumferential positions about the encoder disc. A controller may use a high speed clock to calculate a corrected speed count based on speed counts determined from the number of clock cycles that elapse per cycle of pulse trains from the encoders. The controller may also calculate a corrected position count based at least partly on one or more position counts determined from the number of clock cycles that elapse between periodic sampling points and transitions of encoder pulse trains. The corrected position count may also be calculated based on a position count and one or more speed counts. | 03-25-2010 |
| 20110068731 | LINEAR ENCODER, LINEAR MOTOR SYSTEM, AND METHOD OF MANUFACTURING LINEAR ENCODER - An encoder includes: a main scale having two or more band-shaped tracks in each of which an optical main grating is formed so that longitudinal direction of the main scale corresponds to a measurement axis direction; and an index scale opposed to the main scale so as to form a diffraction interference optical system in cooperation with the main grating, disposed so as to be movable relative to the main scale in the measurement axis direction, and in which two or more optical index gratings are formed. A plurality of slits included in the main grating in at least one track are formed so as to be inclined at a predetermined inclination angle from a direction perpendicular to the measurement axis direction so that pitch of the slits in the track becomes equal to the pitch of the slits in the at least one other track. | 03-24-2011 |
| 20110210691 | METHOD, MEASURING ARRANGEMENT AND APPARATUS FOR OPTICALLY MEASURING BY INTERFEROMETRY THE THICKNESS OF AN OBJECT - Method, measuring arrangement ( | 09-01-2011 |
| 20110298411 | ENCODER, SERVO UNIT AND ENCODER MANUFACTURING METHOD - An encoder includes a disk including a first track and a second track each being ring-shaped and provided with a rotary grating, and a first detector and a second detector that are fixedly disposed so as to respectively face the first track and the second track each provided with a fixed grating that detects diffracted interfering light. A plurality of slits of the first track are formed as curved slits. The first detector facing the first track is disposed at a position where a tangent of each of the slits included in the diffraction grating of the first track becomes parallel to a tangent of each of the slits included in the diffraction grating of the second track at a position where the second detector faces the second track. | 12-08-2011 |
| 20120038307 | Measurement System Using Alignment Unit And Method Of Determining System Parameters Of Alignment Unit - In one embodiment a method determines a system parameter of an alignment unit in a system that measures a position and posture of a workpiece, such as a substrate (or a semiconductor wafer), using the alignment unit. A mounting error of the alignment unit is determined, and a real system parameter value of the alignment unit is determined based on the mounting error, thereby accurately measuring position and posture information of the workpiece. | 02-16-2012 |
| 20130076289 | ROTARY ENCODER, ROTARY MOTOR, AND ROTARY MOTOR SYSTEM - The encoder includes a disk in a disk shape that is arranged rotatably about a rotation axis and that includes one track in a ring shape on which a rotating grating is formed and one or more origin detection areas serving as partial areas on which a rotating grating is formed, and a mask that is fixed and arranged in a manner facing the disk and on which one or more fixed gratings are formed so as to constitute a diffraction interference optical system together with the rotating gratings. A plurality of slits and included in at least one rotating grating are formed along a curved line obtained by curving a plurality of radial lines about the rotation axis in the circumferential direction at predetermined curvature such that pitches and of the slits and can be set to a predetermined value. | 03-28-2013 |
| 20130169209 | ENCODER, SERVOMOTOR, AND MOTOR UNIT - This disclosure discloses an encoder. The encoder includes a disk including a first and a second track. A first and a second rotating grating are formed in the first and second tracks, respectively. A first and a second detector are disposed so as to face the first and second tracks, and have a first fixed grating constructing a first diffraction interference optical system together with the first rotating grating and a second fixed grating constructing a second diffraction interference optical system together with the second rotating grating, respectively, and configured to detect a first and a second detection signal, respectively, from the first and second diffraction interference optical systems. At least one of the first and second rotating gratings is formed by a plurality of curved slits in a curved shape. | 07-04-2013 |
| 20130229138 | REFLECTION ENCODER, SERVO MOTOR, AND SERVO UNIT - Reflected light can be effectively utilized by increasing a light receiving area. Incremental light receiving element groups are separated and arranged in the circumferential direction of a rotating unit while placing a light source therebetween. First and second absolute light receiving element groups are arranged at both sides of the outside and inside of the light source in the radial direction of the rotating unit. As a result, first and second absolute light receiving elements are continuously arranged, and also the incremental light receiving element groups and the absolute light receiving element groups can be arranged to surround the periphery of the light source from four directions. | 09-05-2013 |
| 20140176038 | POSITIONING METHOD AND POSITIONING DEVICE - The present disclosure provides a positioning method and a positioning device. The positioning device includes: an emitter for emitting light beams to a to-be-positioned point and auxiliary positioning points; a receiver for receiving reflected light beams reflected by the to-be-positioned point and the auxiliary positioning points; a judging module for judging whether the reflected light beam reflected by the to-be-positioned point is received or not; and a calculating module for receiving a judging result from the judging module and determining height information of the to-be-positioned point according to the reflected light beams reflected by the to-be-positioned point and the auxiliary positioning points. Thus, the height information of the to-be-positioned point can be determined according to the reflected light beams reflected by the auxiliary positioning points even if the reflected light beam reflected by the to-be-positioned point cannot be received, which improves the success rate of the positioning. | 06-26-2014 |
| 20150123585 | ENCODER, MOTOR WITH ENCODER, AND SERVO SYSTEM - An optical module includes: a light source configured to emit diffusion light to tracks; one light receiving array and another light receiving array which are arranged across the light source in a width direction substantially vertical to the measurement direction; a light receiving array arranged between the one light receiving array and the light source, and configured to receive light which is reflected at the tracks having a first incremental pattern; and a light receiving array arranged between the another first light receiving array and the light source, and configured to receive light which is reflected at the tracks having a second incremental pattern which pitch is longer than a pitch of the first incremental pattern. | 05-07-2015 |
| 20150123586 | ENCODER, MOTOR WITH ENCODER, AND SERVO SYSTEM - The encoder includes a plurality of slit tracks, a point light source, two first light-receiving arrays, two second light-receiving arrays, and a third light-receiving array. The plurality of slit tracks respectively comprises a plurality of reflection slits arranged along a measurement direction. The point light source is configured to emit diffusion light to the plurality of slit tracks. The two first light-receiving arrays are disposed sandwiching the point light source in a width direction substantially orthogonal to the measurement direction. The two second light-receiving arrays are disposed sandwiching the point light source in the measurement direction. The third light-receiving array is configured to receive light reflected by the slit track comprising an incremental pattern that differs in pitch from other incremental patterns, and is disposed at a position in a direction where the first light-receiving array is disposed than the point light source. | 05-07-2015 |
| 20150123587 | ENCODER, MOTOR WITH ENCODER, AND SERVO SYSTEM - An encoder includes a plurality of slit tracks, a point light source, a first light-receiving array, and a second light-receiving array. The plurality of slit tracks respectively comprises a plurality of reflection slits arranged along a measurement direction. The point light source is configured to emit diffusion light to the plurality of slit tracks. The first light-receiving array is configured to receive light reflected by the slit track comprising an incremental pattern, and is disposed at a position in a first direction than the point light source. The second light-receiving array is configured to receive light reflected by the slit track comprising an incremental pattern that differs in pitch from the slit track corresponding to the first light-receiving array, and is disposed at a position in a second direction than the point light source. The second direction forms an angle θ with respect to the first direction. | 05-07-2015 |
| 20150123588 | ENCODER, MOTOR WITH ENCODER, AND SERVO SYSTEM - An encoder includes a plurality of slit tracks, a point light source, a first to third light-receiving arrays. The plurality of slit tracks respectively comprises a plurality of reflection slits. The point light source emits diffusion light to the plurality of slit tracks. The first light-receiving array receives light reflected by the slit track comprising an incremental pattern. The second light-receiving array receives light reflected by the slit track comprising an incremental pattern longer in pitch than other incremental patterns, and is disposed at a position on a side of a direction where the point light source is disposed, than the first light-receiving array, The third light-receiving array receives light reflected by the slit track comprising an absolute pattern, and is disposed at a position on a side of a direction where the point light source is disposed, than the first light-receiving array. | 05-07-2015 |
| 20150292918 | ENCODER, ENCODER-EQUIPPED MOTOR, AND SERVO SYSTEM - An encoder includes a disk on a rotor. First slit tracks each include slits in an incremental pattern in a measurement direction. A second slit track includes slits in an absolute pattern in the measurement direction. A light source emits light to the first and second slit tracks. First light reception arrays are offset from each other in a width direction perpendicular to the measurement direction. The first light reception arrays receive light reflected by the first slit tracks to output first light reception signals. The second light reception arrays receive light reflected by the second slit track to output second light reception signals. A selector selects one of the second light reception signals based on the first light reception signals. A position data generator generates position data of the rotor based on one of the first light reception signals and the one second light reception signal. | 10-15-2015 |
| 20150292919 | ABSOLUTE ENCODER, PROCESSING METHOD, PROGRAM, DRIVING APPARATUS, AND INDUSTRIAL MACHINE - An absolute encoder includes a scale having a sequence of marks, a detector configured to detect a signal corresponding to a plurality of marks of the scale, and a processor configured to obtain an absolute position corresponding to the signal. The processor is configured to select code sequences, from a group of code sequences corresponding to absolute positions, as a candidate group for a code sequence corresponding to the signal, and to select the code sequence corresponding to the signal from the candidate group. | 10-15-2015 |
| 20150354992 | ENCODER, SERVO SYSTEM, AND POSITION DATA GENERATION METHOD OF ENCODER - An encoder includes a disc coupled to a rotating body and having first tracks and one or more second tracks, a light source which emits light to the first and second tracks, first arrays positioned mutually offset in width direction of the disc perpendicular to measurement direction of the first and second tracks such that the first arrays receive light reflected or transmitted by the first tracks and output first signals, two second arrays positioned to receive light reflected or transmitted by the second track such that the second arrays output two second signals having mutually different phases, and a device which generates position data of the body based on one or more first signals and one of the second signals selected based on the first signals. Each first track has an incremental pattern along the measurement direction, and the second track has an absolute pattern along the measurement direction. | 12-10-2015 |
| 20160091869 | Placement Apparatus and Placement Method - The invention relates to a placement apparatus for the positionally accurate alignment and/or fitting of a first placement partner with at least one second placement partner complementary thereto, wherein the placement apparatus has at least one camera apparatus ( | 03-31-2016 |
| 318646000 | With force or weight measuring instruments | 6 |
| 20080203960 | Method and apparatus for estimating system inertia where number of motor rotations are restricted - A method and apparatus for estimating inertia of an electric motor that drives a load wherein the load has a limited range of load travel, the method comprising the steps of identifying an intermediate position along the range of load travel that is separated from a first end of the range of load travel, receiving a sensor signal from a sensor attached to the electric motor, with the load separated from a first end of the range of load travel, increasing a velocity of the electric motor from a first velocity as the load travels toward the first end of the range of load travel, identifying when the load has reached the intermediate position, identifying the motor velocity at the intermediate position as a second velocity, in response to the sensor signal, detecting a first rate of velocity change from the first velocity to the second velocity, acquiring a plurality of torque samples while the electric motor is changing velocity, each torque sample representing an amount of torque generated by the electric motor, calculating a first torque average by averaging the plurality of torque samples and deriving an inertia value as a function of the first rate of velocity change and the first average amount of torque. | 08-28-2008 |
| 20090295325 | Electric Power Steering Apparatus and Method of Assembling the Same - To provide an electric power steering apparatus in which it is possible to minimize a connection distance between a control unit and an electric motor and surely prevent electric noise from mixing between the control unit and the electric motor as well as to minimize electric resistance and minimize an electric loss by directly connecting the control unit and connection terminals of the electric motor and a torque sensor. A motor control apparatus includes a steering column | 12-03-2009 |
| 20100301795 | Drive unit of pressure device - A drive unit of a pressure device, such as a welding gun, includes a piezoelectric type load cell adapted to be arranged in an easily attached and removed manner and to have relatively small capacity. The drive unit includes a through-hole | 12-02-2010 |
| 20110050148 | ACTIVE MATERIAL ACTUATOR REGULATION UTILIZING PIEZOELECTRIC AND PIEZORESISTIVE EFFECT - An active material actuator adapted for use in a circuit includes an active material member, and a piezoelectric or piezoresistive element or otherwise force sensing device, wherein the element or device is communicatively coupled to the member and operable to vary the current within the circuit when the member is caused to achieve a predetermined stress, such that, in one aspect, the element presents an overload protection mechanism. | 03-03-2011 |
| 20130113410 | TORQUE DETECTION DEVICE AND ELECTRIC POWER STEERING SYSTEM - A torque detection device includes: a torsion bar that couples a first shaft to a second shaft; a magnet that is fixed to the first shaft; and a pair of magnetic yokes that are fixed to the second shaft and that are arranged to face each other in an axial direction. Each of the magnetic yokes includes a yoke ring and a plurality of lugs that are arranged in a circumferential direction on the corresponding yoke ring. Each yoke ring includes an extending portion that extends radially outward from base portions of the lugs, and a bent portion that is bent in the axial direction from a radially outer end portion of the extending portion. The outer size of the pair of magnetic yokes in the axial direction is larger than or equal to the length of the magnet in the axial direction. | 05-09-2013 |
| 20160132062 | SERVOMECHANISM WITH PROPORTIONAL CONTROL OF ACTION FORCE - The servomechanism transmitting restrained force to a load device for use with standard remote control systems. The magnitude of the transmitted force is proportional to the control signal and does not depend on the position of the actuator. Internally or externally mounted dynamometer is used to control amount of restrained force. Elements are provided to simplify a great number of mechanical devices which require control of servomechanism output force, or an output force of a mechanism controlled by a servomechanism. It allows improving technical characteristics of many devices, by using it instead of servomechanism with load device position control. It is particularly useful in but not limited to fields, such as remotely controlled lightweight devices, robots, radio controlled models, video camera suspenders. | 05-12-2016 |
| 318647000 | With magnetic field measuring instruments | 5 |
| 20080203961 | MOTOR DRIVING APPARATUS - A controller for a motor driving apparatus switches a direction of electricity flowing through a first coil according to a first lead angle signal obtained based on a first magnetic pole detecting signal and a second magnetic pole detecting signal. The controller switches a direction of electricity flowing through a second coil according to a second lead angle signal obtained based on the first magnetic pole detecting signal and the second magnetic pole detecting signal. Thus, a motor driving apparatus can be configured such that the angle of the rotation center of the rotor with respect to two magnetically sensitive poles can freely be selected. | 08-28-2008 |
| 20090289593 | CONTROL DEVICE FOR AUTOMATIC TRANSMISSION - A control device for an automatic transmission includes a current detecting unit for detecting motor current. The current detecting unit has a counter for counting variation number of a rotational position signal output from a rotational position detecting unit for detecting the rotational position of a motor, and an electrical angle 180° judging unit for judging rotation of electrical angle 180° of the motor. A voltage occurring in a current detecting resistor is sampled at a timing of each integral multiple of the electrical angle of 180° judged in the electrical angle 180° judging unit, and rotation of the motor is controlled in accordance with the difference between motor target current calculated in the motor target current calculating unit and motor current. | 11-26-2009 |
| 20100171459 | LINEAR MOTOR POSITION DETECTION SYSTEM - Provided is a position detection system which is inexpensive and does not need to control the accuracy of mounting a sensor strictly. | 07-08-2010 |
| 20130293179 | APPARATUS AND METHOD FOR CONTROLLING ACTUATOR IN CAMERA MODULE - An apparatus for controlling an actuator in a camera module is provided. The apparatus includes a position controller for producing a control voltage to move a lens of the camera module, a hall sensor for detecting an amount of change in magnetic lines of force generated by a magnet as a hall voltage, a voice coil motor for moving the lens according to a current applied thereto, and a current controller for using a voltage applied to the voice coil motor to detect an interference voltage created by the current applied to the voice coil motor, for generating an interference-eliminated hall voltage by removing the interference voltage from the hall voltage, and for controlling the current applied to the voice coil motor based on the control voltage and the interference-eliminated hall voltage. | 11-07-2013 |
| 20160070270 | LORENTZ ACTUATOR MECHANISM CALIBRATION - An actuator module which includes a Hall sensor, configured to generate output signals indicating a displacement of a mobile component by a Lorentz actuator mechanism, can be calibrated to remove corruption of the output signals due to magnetic fields generated by a coil assembly of the actuator mechanism. Such calibration can include tracking and manipulating one or more of current strength, output signal voltage strength, and mobile component displacement to establish a relationship between output signal voltage and current applied to the coil assembly. The relationship can be used to generate, for a given generated output signal voltage and applied current strength, an offset signal voltage which can be subtracted from the voltage strength of the output signal to determine a corrected output signal, independent of coil assembly corruption, which indicates a displacement of the mobile component. | 03-10-2016 |
| 318648000 | With inertial, direction or inclination measuring instrument | 4 |
| 20080224648 | MOTOR CONTROL DEVICE, METHOD AND PROGRAM STORAGE MEDIUM - There are provided a motor control device and a method for deciding a velocity instruction shape within the limit of a movement range, a velocity, and an acceleration of an object device while maintaining the acceleration as high as possible in inertia identification. The motor control device includes a position control unit for generating a velocity instruction based on a position instruction and a motor position, a velocity control unit for generating a torque instruction based on the velocity instruction and a motor velocity, and a motor drive unit for generating motor current from the torque instruction. The motor control device further includes a model control unit for generating a model torque instruction based on the velocity instruction and a model velocity, an inertia identification unit for identifying an inertia from a predetermined positional instruction according to a ratio of the motor torque instruction integrated value obtained by temporal integration of the torque instruction of the motor at a predetermined section and the model torque instruction integrated value obtained by temporal integration of the model torque instruction at a predetermined section, and an instruction shape generation unit for automatically generating an instruction shape upon identification according to the conditions of the maximum movable distance, the permitted velocity, the permitted acceleration, and the maximum operation time of the object machine. | 09-18-2008 |
| 20100164425 | SENSOR SIGNAL ESTIMATOR AND MOTOR CONTROLLER FOR STABILIZATION OF TRACKING ANTENNA - Provided is an apparatus and method for estimating sensor signals to stabilize a posture of a mobile satellite tracking antenna. The apparatus includes: an angular velocity estimating unit for estimating an angular velocity signal by removing an error signal generated from an input angular velocity sensor signal through a first low frequency band filtering operation; and an inclination angle estimating unit for estimating an inclination angle signal by receiving an inclination angle sensor signal, extracting low frequency component of inclination angle signal through performing a second low frequency band filtering operating on the received inclination angle sensor signal, obtaining an inclination angle integrating signal through integrating the estimated angular velocity signal, extracting high frequency component of inclination angle signal through performing a high frequency band filtering operation on the inclination angle integrating signal, and adding the extracted low frequency component and high frequency component of inclination angle signal. | 07-01-2010 |
| 20150061565 | METHOD AND APPARATUS FOR IMPROVING GIMBAL STABILITY - Enhanced stability for infrared countermeasure systems is provided by using a pair of single axis rate sensors having orthogonal active axes, preferably aligned with the elevation axis and the azimuth axis of the gimbal. The outputs of the orthogonal single axis rate sensors are used to detect instantaneous aircraft angular movement and to use the detected movement to drive the elevation and azimuth motors of the gimbal to move the output mirror for the gimbal to cancel the detected movement. | 03-05-2015 |
| 318649000 | Stable platforms | 1 |
| 20100079101 | HANDHELD OR VEHICLE-MOUNTED PLATFORM STABILIZATION SYSTEM - A hand-held or vehicle-mounted stabilization system including a platform supported by two or more rotatably-coupled gimbal frames each having a pivot assembly disposed at its rotation axis to couple an actuator to a rotation sensor having a rotation-sensitive sensor axis that is preferably fixedly disposed with respect to the rotation axis, and a controller for accepting the sensor signals and for producing each motor signal needed to dispose the platform in a predetermined angular position with respect to each rotation axis independent of changes in mount orientation. An alternative embodiment includes a controller for accepting an external slew signal sequence and for producing the motor signals needed to move the platform along a predetermined sequence of positions represented by the slew signal sequence. | 04-01-2010 |
| 318650000 | With current, voltage or electrical power measuring instruments | 9 |
| 20080297095 | Drive control circuit for polyphase motor capable of reducing variation among armature currents of respective phases, and spindle apparatus using the same - Even when there is some degree of variation in the characteristics among components constituting a polyphase motor and a driving circuit therefor, current control signals of respective phases being input to the drive circuit have their amplitude finely adjusted by an amplitude control circuit, so that amplitude is uniform among armature currents of respective phases that are ultimately output from the drive circuit. The amplitude adjusting circuit is configured by gain variable amplifiers, for example. Thus, rotation fluctuation and vibration of the polyphase motor can be reduced. | 12-04-2008 |
| 20090033272 | TECHNIQUES FOR REDUNDANCY AND FAULT TOLERANCE IN HIGH DEMAND MACHINE SAFETY APPLICATIONS - Self-sensing feedback functionality for electromechanical actuators/motors is provided for use in operation and/or as a redundant safety mechanism to attain safety certification without adding extra bulk or wiring to the motor. An actuator can be manufactured having one or more saliencies that cause a spatial variance of inductance. A high frequency signal can be injected into the actuator and sampled to determine a current, voltage, or other electrical parameter. The parameter can be evaluated against the known saliencies of the actuator to determine a position of the actuator and/or an associated rotor. Additionally, the position can be evaluated as a function of time to determine a velocity. This can provide an alternative method for operating the electromechanical actuator according to the position/velocity provided. Additionally, this can provide a redundant feedback channel for safety certification without requiring additional actuator parts. | 02-05-2009 |
| 20100315032 | Method for determining the angular position of the rotor of a mechanically commutated dc servo motor - Method for determining the angular position of the rotor of a mechanically commutated DC servo motor ( | 12-16-2010 |
| 20110181227 | Method of Determining the Position of the Drive Mechanism of an Electric Machine, Such as a Motor, from the Current Supplied, and Arrangement for Carrying Out the Method - A method and arrangement for determining the position of the drive mechanism of an electric machine from the current supplied thereto. Determination of the position is effected over two independent channels by measuring the three-phase current of the electric machine or motor, converting the measured values to the current space vector, calculating the angle of the current space vector within one electrical revolution, and determining the position of the motor. A current command, the field of which acts in the direction of the flux or field of the drive mechanism or rotor, is added within the motor stator. | 07-28-2011 |
| 20110273127 | VALVE CONTROL DEVICE - In opening/closing control for the valve mechanism to which the return torque is applied in an opening direction or a closing direction of the valve, provided are a position control system for outputting a q-axis current command based on a position deviation between a target position command directed to the brushless DC motor and the coarse present position of the motor obtained by using the position detection sensor of a pulse output type, and a current control system in which a virtual current feedback is built for outputting a phase voltage command without a current sensor based on the q-axis current command and the coarse present position of the motor obtained by using the position detection sensor of the pulse output type. | 11-10-2011 |
| 20130193900 | MOTOR DRIVE CONTROL DEVICE FOR LIMITING OUTPUT OF MOTOR - If it is predicted that the sum of the output of a servo motor and the output of a spindle motor exceeds power supplied by a rectifier unit, during a cutting operation, a motor drive control device controls alternating-current power of a first inverter unit so as to reduce the feed speed of at least one feed axis and controls alternating-current power of a second inverter unit so as not to limit torque of the spindle motor. Further, if it is predicted that the sum of the output of the servo motor and the output of the spindle motor exceeds power supplied by the rectifier unit, during an operation other than the cutting operation, the motor drive control device controls the alternating-current power of the second inverter unit so as to limit the torque so as not to reduce the feed speed. | 08-01-2013 |
| 20140203753 | METHOD AND DRIVE APPARATUS FOR DRIVING AN ELECTROMAGNETIC ACTUATOR - A method of activating an electromagnetic actuator having at least one coil and a movable armature. The method includes the step in which the electromagnetic actuator is demagnetized by passing a sequence of electric current pulses with a current flow direction which alternates from one current pulse to the next and with a current size which decreases from one current pulse to the next, through the at least one coil, in order to reduce or eliminate any residual magnetic flux density in the electromagnetic actuator. The method also includes a step in which a position of the movable armature is determined, after the demagnetization step, by passing a measurement current pulse through the at least one coil. | 07-24-2014 |
| 20150346699 | BACK EMF MONITOR FOR MOTOR CONTROL - An integrated circuit includes a motor current input voltage-to-current (VI) converter that receives a motor current sensor voltage from a motor and a reference voltage to generate an output current related to a motor's current. A motor current calibration VI converter compensates for errors in the motor current input VI converter and generates a calibration output current based on the reference voltage, wherein the output current and the calibration output current are combined to form an estimate of the motor's current. | 12-03-2015 |
| 20160098019 | MOTOR SERVO-DRIVE FOR HIGH PERFORMANCE MOTION CONTROL - A servo-drive system for feedback-based control of motion and positioning of a motor comprises a current measurement device that obtains a measure of current being drawn by the drive motor from which to provide feedback. The current has an operating range which is made up of a relatively large current range for acceleration but remains within a relatively smaller current range for steady state operating of the motor. The current measurement device has a first, coarse, sensor optimized for measuring the relatively large current range and a second, fine, sensor optimized for measuring the relatively smaller current range, thereby to maximize feedback accuracy during steady state operation. | 04-07-2016 |
| 318651000 | With acceleration measuring instruments | 1 |
| 20140191702 | MOTOR CONTROLLING DEVICE, MOTOR CONTROLLING METHOD AND MACHINERY SYSTEM - A motor controlling device is provided. The device includes a position controller for generating a speed reference based on a positional reference and a motor position, a speed controller for generating a torque reference based on the speed reference and a motor speed, a motor drive for driving a motor based on the torque reference, the motor driving machinery to which an acceleration sensor is attached, an acceleration feedback signal generator for generating a feedback signal to the speed reference based on an acceleration detection signal that is a detection signal of the acceleration sensor, and a positional reference filter inputted with the positional reference and suppressible of low frequency vibration of the machinery. | 07-10-2014 |
| 318652000 | With particular position measuring instruments | 25 |
| 20090058349 | ANGLE-CALCULATION APPARATUS AND ANGLE-CALCULATION METHOD FOR THREE-PHASE OPTICAL ENCODER - An angle-calculation apparatus for three-phase optical encoder receives three-phase sinusoidal signals 120 degree phase from the optical encoder and obtains angle information for a motor rotor. The angle-calculation apparatus includes an A/D converter, a digital signal processor (DSP), a phase digitalizer and a digital counter. The A/D converter converts three-phase analog signals of the optical encoder into three-phase digital signals. The phase digitalizer converts the three-phase analog signals into digital phase signals. The digital counter generates a counting value based on the digital phase signals. The DSP performs an inverse trigonometric function calculation on a relatively linear region of the three-phase digital signals to obtain the angle information. The DSP obtains the rotation turn number and rotation direction of the motor rotor according to the counting value. | 03-05-2009 |
| 20100066298 | POSITIONING DEVICE IN GANTRY TYPE OF CONSTRUCTION - In a positioning device in gantry type of construction, due to a special arrangement of the position-measuring devices used for the positioning, errors due to thermal expansion of the positioning device may be avoided to a great extent. In particular, attention is given to the advantageous placement of fixed point of a scale relative to a straightness track of a further scale. | 03-18-2010 |
| 20100109595 | INTEGRATED ACTUATOR SENSOR STRUCTURE - An integrated sensory actuator ( | 05-06-2010 |
| 20120133319 | METHODS, SYSTEMS, AND DEVICES FOR A MOTOR CONTROL SYSTEM - Systems, devices, and methods for controlling a motor are disclosed. A method may include determining a rotational direction of a motor from a pair of quadrature signals sent to a microprocessor. The method further includes adjusting an internal count stored in the microprocessor at each edge of each of the pair of quadrature signals. The method further includes adjusting an external count stored in the microprocessor and transmitting an interrupt to a main controller after the first phase signal and the second phase signal have transitioned through each combinational logic state in one of a forward rotational direction and a reverse rotational direction. The method further includes transmitting a signal comprising the rotational direction of the motor and the external count from the microprocessor to a main controller. | 05-31-2012 |
| 20120139468 | MULTI-ROTATION HOBBY SERVO MOTORS - Multi-rotation hobby servo motors are provided. In one embodiment, a hobby servo motor comprises a rotatable output shaft, a feedback mechanism, and a control circuit. The feedback mechanism generates a feedback signal that is indicative of rotation of the rotatable output shaft, and the control circuit utilizes the feedback signal to generate a control signal for the rotatable output shaft. The feedback mechanism is optionally an encoder such as, but not limited to, a magnetic encoder, an optical encoder, a rotary encoder, or a linear encoder. | 06-07-2012 |
| 20130020981 | POSITIONING SENSING AND POSITION SERVO CONTROL - Implementations of actuators and capacitor-based position sensors for monitoring and controlling positioning of the actuators are provided, including implementations of actuators that use flexures to provide support to actuators and pivoting mechanisms to the actuators. Such actuators can be electromagnetically activated actuators that include a magnet stator and a coil rotor mounted on a flexure. A positioning sensor, such as a capacitor sensor, is provided to measure and monitor positioning of the actuator and is coupled to a feedback circuit which uses the measured positioning of the actuator to control the actuator. | 01-24-2013 |
| 20130076290 | POSITION SENSING DEVICE, ROTATIONAL ACTUATOR HAVING THE SAME, SHIFT-BY-WIRE SYSTEM HAVING THE ROTATIONAL ACTUATOR, AND METHOD FOR DETECTING POSITION OF MOVABLE MEMBER - A pulse signal output unit sends three-phase pulse signals according to movement of the movable member. A counter unit adds a first predetermined value or a second predetermined value to a count value or subtracts the first predetermined value or the second predetermined value from the count value, according to a combination of the pulse signals appearing when all the pulse signals are normal and a combination of the pulse signals appearing when one of the pulse signals malfunctions. A position detection unit detects the position of the movable member according to the count value. | 03-28-2013 |
| 20140111133 | HOBBY SERVO MOTOR LINEAR ACTUATOR SYSTEMS - Hobby servo motor linear actuator systems are provided. In certain circumstances, a linear actuator system includes a lead screw attachment mechanism and a lead nut. The lead screw attachment mechanism is configured to be rotatably connected to an output shaft of a hobby servo motor assembly. The lead nut is configured to move linearly along the lead screw attachment mechanism as it is rotated. The system is optionally either open-looped or closed-loop. The lead screw attachment mechanism has an outer surface that can include multiple different types of threads such as, but not limited to, gear teeth and screw threads. The hobby servo motor assembly may include one hobby servo motor or multiple hobby servo motors that work together. | 04-24-2014 |
| 20150035469 | SENSING PM ELECTRICAL MACHINE POSITION - An electrical machine includes a stator having a stator winding and a secondary transformer coil. A rotor is operatively connected to rotate relative to the stator, wherein the rotor includes a plurality of embedded permanent magnets. A primary transformer coil is wound on the rotor and is operatively connected to form a rotating transformer with the secondary transformer coil. An inverter/active rectifier component is operatively connected to the stator winding and the secondary transformer coil to control the stator winding based on a sense in the secondary transformer coil received from the primary transformer coil. | 02-05-2015 |
| 20150097508 | METHOD FOR MEASURING DISPLACEMENT OF PLANAR MOTOR ROTOR - A method for measuring the displacement of a planar motor rotor. The measuring method comprises: four magnetic induction intensity sensors are distributed on the planar motor rotor; sampled signals of the four distributed sensors are processed to obtain signals B | 04-09-2015 |
| 20150123589 | ENCODER, MOTOR WITH ENCODER, SERVO SYSTEM, AND SIGNAL PROCESSING METHOD FOR ENCODER - An encoder includes a measurement target which is coupled to a motor, a module which is positioned relative to the measurement target and generates signals based on motion of the measurement target, and a control device which generates and outputs position data based on the signals from the module and includes a position detector, an abnormality detector, a cause analyzer, a non-volatile memory, and a non-volatile memory controller. The position detector detects a position of the motor, the abnormality detector detects an abnormality based on state information including a state of the position detector, the cause analyzer analyzes the state information when the abnormality detector detects the abnormality such that a cause of the abnormality detected by the abnormality detector is identified, and the non-volatile memory controller stores in the non-volatile memory a result of analysis obtained by the cause analyzer. | 05-07-2015 |
| 318653000 | Magnetic transducers | 8 |
| 20090195208 | APERTURE CLOSURE MEMBER CONTROL ARRANGEMENTS - An aperture closure member control arrangement includes a disc which rotates as the aperture closure member moves. The disc has a ring of teeth. A sensor, such as a Hall effect sensor and permanent magnet, detect the passage of teeth as a cyclic waveform of amplitude and frequency determined by the spacing of the teeth, and the speed of rotation of the disc. An irregularity in the form of a missing tooth creates an irregularity in the output of the sensor, in the form of a pulse of greater amplitude and lower frequency. Accordingly, pulses from the irregularity can be discriminated and counted to provide a coarse indication of position, or pulses from the teeth can be counted, to provide a fine indication. | 08-06-2009 |
| 20100181956 | ROTATIONAL POSITION DETECTING METHOD FOR AC SERVOMOTOR AND SIMPLE ENCODER - A motor rotational position detecting method detects the magnetic pole position of each phase of a three-phase AC servomotor, generates a three-phase square wave signal having a phase difference of 120 degrees, allocates data on the rotational position of a motor shaft to the edge of each square wave signal, calculates the rotational speed of the motor on the basis of the elapsed time from the previous edge detection point to this time edge detection point, and estimates the rotational position of the motor shaft at a certain period and outputs it on the basis of the rotational speed of the motor and the rotational position allocated to this time edge in the rotational section from this time edge detection point to the next edge detection point. As a result, a detection mechanism can be constructed with a small installation space and at low cost and the output of a high-resolution encoder can be obtained in a pseudo manner. | 07-22-2010 |
| 20120074890 | APPARATUS AND METHODS FOR DETERMINING AN INITIALLY UNKNOWN COMMUTATION POSITION OF A MEMBER MOVED BY A PLANAR MOTOR - An exemplary stage apparatus has a motor, stage, and position-measuring device. The motor has a planar stator and moving-coil mover (planar motor). The stator is a checkerboard magnet array extending in an x-y plane and producing a magnetic field having a field period of 2π in a u-v coordinate system rotated 45° from the x-y coordinate system of the plane. The stage, coupled to the mover, moves with corresponding motions of the mover relative to the stator. The position-measurement device includes a first group of four magnetic-field sensors that are movable with the stage. The sensors are situated at integer multiples of π/2 from each other in u- and v-directions of the u-v coordinate system. The sensors produce respective data regarding a respective component of the magnetic field at, and hence the position of, the respective sensor within the period of the magnetic field. | 03-29-2012 |
| 20150015175 | POSITION DETECTING APPARATUS AND DRIVING SYSTEM - The position detecting apparatus includes a comparing part that compares the value of the digital signal output from the AD converter and a reference value that is based on a preset reference amplitude at the timings and outputs a control signal responsive to a result of the comparison. The position detecting apparatus includes an amplitude controlling part that controls amplification factors of the first amplifier and the second amplifier in such a manner that the value of the digital signal output from the AD converter comes closer to the reference value in response to the control signal output from the comparing part. | 01-15-2015 |
| 20150091491 | Reluctance Motor System - A method and apparatus for controlling operation of an electric motor. A controller is configured to identify a position of a disc relative to a plate with coils physically associated with the plate. The controller is further configured to control a current sent to the coils based on the position of a disc. The disc is configured to move such that a closest point between the disc and the plate changes along a periphery of the disc. | 04-02-2015 |
| 20150108937 | VALVE ACTUATORS - A valve actuator having a drive shaft, which, in use, is configured to adjust a valve between an open position and a closed position, an AC induction motor for driving the drive shaft a contactless position sensor configured to, in use, output a signal representing an angular position of the drive shaft or the valve, and a controller configured to control the AC motor in accordance with the signal output by position sensor. | 04-23-2015 |
| 20150130389 | RELATIVE ROTATIONAL ANGULAR DISPLACEMENT DETECTION DEVICE, TORQUE DETECTION DEVICE, TORQUE CONTROL DEVICE, AND VEHICLE - A relative rotational angular displacement detection device includes a pair of rotatable members rotatable relative to each other in a circumferential direction. A permanent magnet is attached to one of the rotatable members and includes magnetic poles magnetized in an axial direction of the axis of rotation and arranged to alternate in polarity in the circumferential direction. A magnetic flux guiding ring includes an annular ring body attached to the other of the rotatable members and is arranged coaxially with the axis of rotation, and a plurality of protruding portions each having a circumferential width smaller than the circumferential width of the magnetic pole. A magnetic detection unit is configured to detect magnetic fluxes of the ring body of the magnetic flux guiding ring. The magnetic flux guiding ring is magnetized depending on the positions of the protruding portions relative to the positions of the magnetic poles. | 05-14-2015 |
| 20150330811 | ANGLE DETECTING DEVICE AND SERVO APPARATUS USING SAME - An angle detecting device includes a rotatably supported magnet, and a magnetic sensor disposed opposite to the magnet. An output of the magnetic sensor is changed based on a magnetic flux change due to a rotation of the magnet. The magnet is disposed such that a distance between the magnetic sensor and the magnet is changed by the rotation of the magnet. | 11-19-2015 |
| 318656000 | Differential transformer systems | 4 |
| 20100072939 | MOTOR DRIVING SYSTEM COMPATIBLE WITH DIFFERENT TYPES OF ENCODERS - A system compatible for different types of signals relates to a motor includes a differential amplifier, a comparator, and a transmitting device. The differential amplifier is configured to receive one of a differential digital pulse signals pair and a differential analog signals pair. The differential digital pulse signals pair is converted to a first digital signal, and the differential analog signals pair is converted to an analog signal by the differential amplifier. The comparator is configured to convert the analog signal into a second digital signal. The first digital signal is received and outputted by the comparator. The transmitting device is configured to convert a data signals pair to a binary code, and convert differential reference digital signals pairs to reference digital signals. The reference digital signals, the first and second digital signals are received by an external computing device. | 03-25-2010 |
| 20130328516 | METHOD AND POSITION DETECTION APPARATUS FOR DETECTING A POSITION OF A MOVABLE ELEMENT OF A DRIVE APPARATUS - A method for detecting a position of a movable element of a drive apparatus by means of a position detection apparatus comprising at least one field coil and at least one secondary coil associated with the field coil, wherein an electrical excitation pulse is applied to the field coil in order to induce an electrical voltage in the secondary coil, a secondary coil voltage is measured and the position of the movable element is determined on the basis of the measured secondary coil voltage. The invention also relates to a position detection apparatus and/or a drive apparatus. | 12-12-2013 |
| 318661000 | Resolver systems | 2 |
| 20080278106 | APPARATUS, SYSTEM, AND METHOD FOR SIMULATING OUTPUTS OF A RESOLVER TO TEST MOTOR-RESOLVER SYSTEMS - An apparatus, system, and method are provided for simulating outputs of a resolver. One apparatus includes an adjustable sine waveform generator for simulating first and second sine wave signals, and an adjustable cosine waveform generator for simulating first and cosine wave signals. The apparatus also includes an adjustable waveform generator and an adjustable gain circuit coupled to the sine waveform generator and cosine waveform generator. The system includes a device simulating a resolver coupled to a motor controller. The device includes an adjustable sine waveform generator and an adjustable cosine waveform generator coupled to an adjustable waveform generator and an adjustable gain circuit. One method includes transmitting a signal simulating at least one resolver fault condition to a motor controller to determine if the motor controller detects the fault condition(s). If the motor controller fails to detect the fault condition(s) and/or transmit an error message, the motor controller is malfunctioning. | 11-13-2008 |
| 20080284366 | APPARATUS AND MEHTODS FOR DIAGNOSING MOTOR-RESOLVER SYSTEM FAULTS - Apparatus and methods are provided for diagnosing faults in multiple, associated motor-resolver systems. One apparatus includes a swapping circuit coupling a first resolver to a first or second decoder, and a swapping circuit coupling a second resolver to the first or second decoder. One method includes applying a signal from a resolver to a first decoder to determine that the first decoder is malfunctioning if the first decoder continues to generate a fault signal, and applying a signal from a different resolver to a second decoder to determine that a motor associated with the first decoder is malfunctioning if the second decoder generates a fault signal. Another method includes transmitting a signal from a resolver to first and second decoders, transmitting a signal from a different resolver to the first and second decoders, and determining if the first decoder, second decoder, a first motor, or a second motor is malfunctioning. | 11-20-2008 |
| 318662000 | Variable capacitor systems | 1 |
| 20100052597 | Displacement actuation and sensing for an electrostatic drive - An electrostatic drive includes a first electrode and a second electrode responsive to a drive signal. The drive signal includes an actuation signal constituent and a sensing signal constituent. The sensing signal constituent is at a frequency higher than a natural mechanical resonant frequency of the electrostatic drive. In response to the actuation signal constituent, displacement between the first electrode and the second electrode changes, which is evaluated by detecting a change in an electrical characteristic of the drive as a function of the sensing signal constituent. | 03-04-2010 |
| 318663000 | Potentiometer systems including autotransformers and Wheatstone bridges | 1 |
| 20090140687 | HOBBY SERVICE HAVING ENHANCED OPERATIONAL PERFORMANCE - An apparatus is disclosed for enhancing the operational performance of a servo. The apparatus comprises an auxiliary shaft that is independent and displaced from the servo and an actuation sensor that is operably coupled to the auxiliary shaft. The auxiliary shaft is configured to be driven by a motor associated with the servo. | 06-04-2009 |
