Fine And Coarse Systems Patents (Class 318/592)
  • Patent number: 10620017
    Abstract: A curvilinear encoder is provided in which an incremental or absolute position for a cart can be detected on a track by applying one or more excitation signals and receiving one or more pick up signals. Analogous to a transformer arrangement, an encoder mover can be placed on the cart moving along the track, and an encoder stator can be placed on the track separated by a gap. The one or more excitation signals can be applied to the one or more excitation coils on the mover or the stator to generate one or more magnetic fields, and the one or more pick up signals can be received by one or more pick up coils on the mover or the stator for sensing changes in the magnetic fields produced by motion of the mover on the track.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: April 14, 2020
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Xikai Sun, Peter M. Smit, Mark R. Cooper, Oliver C. Haya, Nanwei Yao
  • Patent number: 10480961
    Abstract: A linear and curvilinear encoder is provided in which absolute mechanical position and high resolution position determination can be obtained using a cart having a mover with “hybrid” teeth, configured in a curvilinear profile or shape, moving along a curvilinear track with a stator having teeth. The absolute mechanical position and high resolution position determination can be detected on the track by applying an excitation signal to a coil surrounding particular teeth of the stator to produce an electromagnetic (EM) field which can be influenced by the profile or shape of the teeth of the mover. A resulting pick-up signal can then be detected in a pick-up coil surrounding particular teeth of the stator with different harmonics in the pick-up signal corresponding to harmonics of the profile or shape of the teeth.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: November 19, 2019
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Xikai Sun, Peter M. Smit, Mark R. Cooper, Oliver C. Haya, Aderiano M. da Silva
  • Patent number: 10469016
    Abstract: Provided herein are systems, methods, and software for improving drive efficiency in an industrial automation system. In one implementation, a system comprises a mechanical load, an electromechanical device attached to the mechanical load, and a drive coupled to the electromechanical device. A processor is programmed to generate and display an acceleration curve, a duplicate acceleration curve, an energy curve and a duplicate energy curve. A user input is received indicating a change to at least a portion of the duplicate acceleration curve, and a change to the duplicate energy curve is calculated and displayed. A modified command signal based on the user input is calculated, and the drive is configured to control the electromechanical device via the modified command signal to mechanically operate the mechanical load perform a task.
    Type: Grant
    Filed: July 2, 2018
    Date of Patent: November 5, 2019
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Brian R. Fast, Robert J. Miklosovic
  • Patent number: 10213821
    Abstract: A power tool includes a motor having an output shaft, an extensible member driven by the motor, a working assembly movable in response to contact with a distal end of the extensible member, a first sensor configured to detect a home position of the extensible member, a second sensor configured to detect rotation of the motor output shaft, and a controller in electrical communication with the first and second sensors. The controller is configured to drive the motor output shaft in a first rotational direction a predetermined number of revolutions counted by the second sensor, thereby displacing the extensible member from the home position. The controller is also configured to drive the motor output shaft in an opposite, second rotational direction to thereby return the extensible member until the home position is detected by the first sensor.
    Type: Grant
    Filed: October 3, 2017
    Date of Patent: February 26, 2019
    Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
    Inventors: Troy C. Thorson, Jeffrey M. Wackwitz, Kyle J. Radovich, Jonathon R. Gasteiner
  • Patent number: 10193483
    Abstract: In a method and device for the cyclic digital transmission of a position value of a moving object with inertial mass, the value range of the transmitted position value is restricted such that no complete rotation or, in the case of a linear motion, other complete period caused by mechanical conditions may be mapped, and the actual position is formed by detecting value-range exceedances in an evaluation unit.
    Type: Grant
    Filed: May 11, 2017
    Date of Patent: January 29, 2019
    Assignee: SEW-EURODRIVE GMBH & CO. KG
    Inventor: Olaf Simon
  • Patent number: 10184807
    Abstract: The current disclosure relates to an angular sensor. The angular sensor includes a sensing module, a digital processor and an incremental interface. The sensing module is configured to generate a sensing signal containing measurements of rotation activities of a rotating physical entity. The digital processor is configured to process and store the sensing signal. The incremental interface is coupled to the digital processor and includes an incremental pulse generator and a status data encoder. The incremental pulse generator is configured to convert and transmit the sensing signal as incremental square pulses through a unidirectional signal line, which are processed to generate rotary angle and direction of the physical entity. The status data encoder is configured to convert and transmit the sensing signal as a reference pulse and a status signal through a bidirectional signal line, which can be to request an absolute angle position or other sensor data.
    Type: Grant
    Filed: September 26, 2016
    Date of Patent: January 22, 2019
    Assignee: Infineon Technologies AG
    Inventors: Mario Motz, Wolfgang Scherr
  • Patent number: 10059440
    Abstract: A propeller alignment device is described. The propeller alignment device can include a second retainer attached to a propeller and a motor. The propeller alignment device can also include a first retainer that does not rotate, but that is aligned with the second retainer. The first retainer can include two or more magnets oppositely orientated relative to each other. The second retainer can also include two or more magnets oppositely orientated relative to each other. As the second retainer rotates relative to the first retainer, the magnets alternatingly align with each other. In the absence of a current applied to the motor, the magnets may magnetically bias the second retainer into a predetermined orientation relative to the first retainer.
    Type: Grant
    Filed: November 29, 2017
    Date of Patent: August 28, 2018
    Assignee: Amazon Technologies, Inc.
    Inventors: Jack Erdozain, Jr., Louis LeRoi LeGrand, III, Joshua White Traube
  • Patent number: 9939801
    Abstract: A first speed and a second speed slower than the first speed are set as a contact speed when a work w and a detection jig t attached to a tool post are brought into contact with each other to detect a position or a posture of the work w, the work and the detection jig are brought into contact with each other at the first speed, the detection jig and the work contacting each other are separated from each other by a predetermined distance, the work and the detection jig which are separated from each other are brought into contact with each other at the same position at the second speed, and a correction value ? is obtained based on a tool post position or a spindle angle during the second contact.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: April 10, 2018
    Assignee: NAKAMURA-TOME PRECISION INDUSTRY CO., LTD.
    Inventor: Masahiko Kakumoto
  • Patent number: 9878784
    Abstract: A propeller alignment device is described. The propeller alignment device can include a second retainer attached to a propeller and a motor. The propeller alignment device can also include a first retainer that does not rotate, but that is aligned with the second retainer. The first retainer can include two or more magnets oppositely orientated relative to each other. The second retainer can also include two or more magnets oppositely orientated relative to each other. As the second retainer rotates relative to the first retainer, the magnets may alternatingly align with each other. In the absence of a current applied to the motor, the magnets may magnetically bias the second retainer into a predetermined orientation relative to the first retainer. The predetermined orientation can be predetermined to correspond to an alignment of the propeller that is desirable (e.g., that minimizes aerodynamic drag on the propeller).
    Type: Grant
    Filed: December 11, 2015
    Date of Patent: January 30, 2018
    Assignee: Amazon Technologies, Inc.
    Inventors: Jack Erdozain, Jr., Louis LeRoi LeGrand, III, Joshua White Traube
  • Patent number: 9760022
    Abstract: A fine-motion module for use in a wafer stage of a photolithography tool includes: a base (201); a fine-motion plate (210); a plurality of vertical motors (203), fixed between the base and the fine-motion plate; a plurality of gravity compensators (202), each having one end fixed on the base and the other end configured to support the fine-motion plate; a plurality of absolute-position sensors (205, 211), configured to measure an absolute position of the fine-motion plate and to adjust pressures in the gravity compensators based on the obtained absolute-position measurements such that the absolute position of the fine-motion plate is changed to a predetermined initial vertical position; and a plurality of relative-position sensors (204, 207), configured to measure a relative position of the fine-motion plate to the base and to control the fine-motion plate based on the obtained relative-position measurements, thereby moving the fine-motion plate to a relative zero position.
    Type: Grant
    Filed: February 12, 2015
    Date of Patent: September 12, 2017
    Assignee: SHANGHAI MICRO ELECTRONICS EQUIPMENT (GROUP) CO., LTD.
    Inventors: Feihong Liao, Yuebin Zhu, Haili Jia, Shuping Hu
  • Patent number: 9651952
    Abstract: In a method and device for the cyclic digital transmission of a position value of a moving object with inertial mass, the value range of the transmitted position value is restricted such that no complete rotation or, in the case of a linear motion, other complete period caused by mechanical conditions may be mapped, and the actual position is formed by detecting value-range exceedances in an evaluation unit.
    Type: Grant
    Filed: May 10, 2012
    Date of Patent: May 16, 2017
    Assignee: SEW-EURODRIVE GMBH & CO. KG
    Inventor: Olaf Simon
  • Patent number: 9534955
    Abstract: The present disclosure describes an ultraviolet (UV) sensor configured to detect a target UV spectrum (e.g., UVB spectrum). The UV sensor includes a first photodiode with a first UV spectral response and a second photodiode with a second UV spectral response. A filter layer having a graded spectral response is formed over the second photodiode, and the second UV spectral response is affected by a controlled parameter (e.g., thickness) of the filter layer. The UV sensor further includes a subtraction circuit coupled with the first photodiode and the second photodiode. The subtraction circuit is configured to provide a differential response based on a difference between the first UV spectral response and the second UV spectral response. The controlled parameter of the filter layer can be selected such that the differential response provides a detected spectral response of the target spectrum.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: January 3, 2017
    Assignee: Maxim Integrated Products, Inc.
    Inventors: Christopher F. Edwards, Dan G. Allen, Cheng-Wei Pei, Timothy K. McGuire, Joy T. Jones, Nicole D. Kerness
  • Patent number: 9477221
    Abstract: A motor-based position system includes one or more motors having a rotor. The system further includes a motor controller. The motor controller is communicatively coupled to each of the motors. The system further includes one or more encoders configured to detect an absolute position of each motor and one or more devices configured to collect inertial data. The system further includes a processing device coupled to the motor controller, one or more encoders and one or more devices. The processing device is configured to receive signals indicative of motors' absolute position from the encoders and configured to convert the received encoder signals into a format understood by the motor controller. The processing device is further configured to send the converted signals to the motor controller with low latency and configured to combine the received encoder signals with the inertial data to generate more accurate positional information.
    Type: Grant
    Filed: June 2, 2015
    Date of Patent: October 25, 2016
    Assignee: Goodrich Corporation
    Inventors: Erik V. Rencs, Scott W. Ramsey
  • Patent number: 9318939
    Abstract: A motor control device performs drive control of a motor connected to an object. The motor control device includes a rotation detection unit that detects rotation of the motor and outputs a detection signal, a counter unit that receives the detection signal from the rotation detection unit and outputs a count based on the received detection signal, and an error detection unit that receives counts from the counter unit at intervals of a reference period, computes a difference between a present count received from the counter unit and a previously received count, and detects that an error arises in the rotation detection unit when the difference is continuously less than a reference value.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: April 19, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Tatsuya Watahiki, Natsuko Ishizuka
  • Patent number: 9231500
    Abstract: An electric motor control system includes a motor control circuit for generating a motor control signal and a braking mechanism for adjusting the motor control signal to augment motor losses when the motor control circuit is in a braking mode. The braking mechanism includes a difference component for receiving a first signal containing motor reference speed information, for receiving a second signal containing actual speed information, and for generating a third signal containing information indicating a difference between the reference speed and the actual speed. An integrating component integrates the third signal and generates a fourth signal representing the integrated third signal. The fourth signal may augment a voltage control signal in a voltage-based control circuit or may augment a flux-producing component of a current control signal in a current-based control circuit. The electric motor control circuit may include multiple braking mechanisms for use in different modes of operation.
    Type: Grant
    Filed: January 30, 2013
    Date of Patent: January 5, 2016
    Assignee: Nidec Motor Corporation
    Inventors: Darko Marcetic, Mile Bozic
  • Patent number: 9160214
    Abstract: Provided is an electric motorcycle including a traveling motor, and a power supply circuit of an inverter and the like, in which a non-conducting cooling oil is supplied to be brought into direct contact with at least one of an electromagnetic coil of the traveling motor and a circuit board of the inverter. A radiator is disposed outside cases of a power plant and a power control controller so as to allow a traveling wind to pass by. Cooling oil is circulated between the radiator and a case of at least one of the power plant and power control controller. A cooling structure for an electric motor and the like that can obtain a higher cooling efficiency than a conventional art while having a simple structure which hardly causes increases in size, weight, cost, and the like can be provided.
    Type: Grant
    Filed: November 12, 2010
    Date of Patent: October 13, 2015
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventor: Yoshimoto Matsuda
  • Patent number: 9099949
    Abstract: There are provided a back electromotive force detection circuit and a motor driving control apparatus using the same. The back electromotive force detection circuit includes a duty determining unit and a delay compensation unit. The duty determining unit outputs a differential level according to a duty of a driving control signal of a motor. The delay compensation unit performs delay compensation differently on each differential level to compensate for a delay in back electromotive force of the motor regardless of a variation in a duty of the driving control signal.
    Type: Grant
    Filed: May 23, 2013
    Date of Patent: August 4, 2015
    Assignee: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Hyun Paek, Joo Yul Ko
  • Patent number: 8946652
    Abstract: Provided is a sample positioning technology wherein micro-vibrations of a top table on which a sample is placed are suppressed such that the quality of an image to be observed or the precision of a measured dimension value can be improved. A sample positioning apparatus according to the present invention is provided with an active brake for stopping the top table, an inner frame which surrounds the active brake, an outer frame which surrounds the inner frame, and actuators for driving the active brake. The actuators, after driving the active brake to stop the top table with respect to a stage, press the outer frame to adjust the position of the top table.
    Type: Grant
    Filed: November 8, 2012
    Date of Patent: February 3, 2015
    Assignee: Hitachi High-Technologies Corporation
    Inventors: Motohiro Takahashi, Hironori Ogawa, Nobuo Shibata, Masaki Mizuochi, Shuichi Nakagawa, Hiroshi Tsuji
  • Patent number: 8786240
    Abstract: The invention realizes a method for controlling an electric cylinder and a control system for the cylinder that can prevent a load for pressurizing from significantly exceeding a target load and can shorten the time for the pressurization. A servo controller 17 can set the speed of the rod 11 and a load for stopping Ps that is used for determining whether the rod 11 should be stopped so that the load for pressurizing Pm does not significantly exceed the target load Pt. The servo controller 17 drives the rod 11 under the position control mode and determines whether the load for pressurizing Pm that is detected by a load detector 13 is bigger than or equal to the load for stopping Ps.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: July 22, 2014
    Assignee: Sintokogio, Ltd.
    Inventors: Yoichiro Shirai, Masahiko Nagasaka
  • Patent number: 8510069
    Abstract: A feedback system for controlling a servo motor comprising at least one rotary angle sensor and at least one rotary speed sensor, wherein the rotary angle sensor supplies a measured rotary angle value to a computer, wherein the rotary speed sensor supplies a measured rotary speed value to the computer, the actual rotary speed values are the measured rotary angle values interpolated according to the integrated measured rotary speed values, and wherein at high rotary speeds, the actual rotary speed values are the calibrated measured rotary angle values, differentiated with respect to time, and at low rotary speeds, the actual rotary speed values are the measured rotary speed values.
    Type: Grant
    Filed: March 8, 2011
    Date of Patent: August 13, 2013
    Assignee: Sick Stegmann GmbH
    Inventors: Ulrich Armbruster, Josef Siraky
  • Patent number: 8374421
    Abstract: Methods and systems for robot and cloud communication are described. A robot may interact with the cloud to perform any number of actions using video captured from a point-of-view or in the vicinity of the robot. The cloud may be configured to extract still frames from compressed video received from the robot at a frame rate determined based on a number of factors, including the robot's surrounding environment, the available bandwidth, or actions being performed. The cloud may be configured to request that a compressed video with higher frame rate be sent so that the cloud can extract still frames at a higher frame rate. Further, the cloud may be configured to request that a second compressed video from a second perspective be sent to provide additional environment information.
    Type: Grant
    Filed: October 18, 2011
    Date of Patent: February 12, 2013
    Assignee: Google Inc.
    Inventor: Ryan Hickman
  • Patent number: 8143818
    Abstract: 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.
    Type: Grant
    Filed: August 13, 2009
    Date of Patent: March 27, 2012
    Assignee: Olympus Corporation
    Inventors: Shin Otsuka, Yoshihiro Ue
  • Publication number: 20120007537
    Abstract: Disclosed is a method for controlling an electro-mechanical brake system including a cascade controller, in which a position controller, a speed controller and a current controller are integrated to control a motor. The method includes determining whether an actual speed of a motor exceeds a command speed of the motor in an early stage of a motor operation; and restricting speed reduction of the motor until a braking force is generated if the actual speed of the motor exceeds the command speed of the motor in the early stage of the motor operation. Speed reduction of the motor is restricted until braking force is generated even if a speed error (actual speed of the motor>command speed of the motor) occurs in the early stage of the motor operation in the EMB system, thereby improving the braking responsiveness.
    Type: Application
    Filed: July 7, 2011
    Publication date: January 12, 2012
    Inventor: Myoung June KIM
  • Patent number: 7915888
    Abstract: Methods and systems for detecting an angular position of an electric motor are disclosed, including sending an electrical pulse through a stator coil of the electric motor, determining an approximate angular position of a rotor of the electric motor in response to detecting an timing of a returning electrical pulse from the stator coil, the timing of the returning electrical pulse being indicative of the angular position of the rotor; and determining an accurate position of the rotor in response to sensing a transition of a digital sensor in response to the rotor rotating relative to the stator, the transition being indicative of the accurate position.
    Type: Grant
    Filed: April 2, 2008
    Date of Patent: March 29, 2011
    Assignee: Continental Automotive Systems, Inc.
    Inventors: Patrick A. O'Gorman, Rene Vivanco, Alex Kurnia
  • Patent number: 7598697
    Abstract: A motor and a method for serves finding the position of an armature in relation to a stator of the motor.
    Type: Grant
    Filed: June 26, 2007
    Date of Patent: October 6, 2009
    Assignee: Festo AG & Co.
    Inventors: Christian Welk, Michael Apel, Ralf Hartramph
  • Patent number: 7579793
    Abstract: Methods and systems are provided for driving one or more force coils. A system for driving force coils is provided including a PWM drive coupled to a first coil and a linear drive coupled to a second coil. The PWM drive efficiently drives the first coil to apply a first force. The linear drive drives the second coil to apply a second force that is substantially noise-free. The first force is greater than the second force.
    Type: Grant
    Filed: February 14, 2007
    Date of Patent: August 25, 2009
    Assignee: Honeywell International Inc.
    Inventor: James C. Fischer
  • Patent number: 7545112
    Abstract: A fan motor control device comprises a clock signal generator and a drive unit. The clock signal generator generates a low-frequency clock signal. A frequency of low-frequency clock signal is less than 23 KHz. The drive unit converts the low-frequency clock signal to a high-frequency drive signal and outputs the high-frequency drive signal to drive the fan motor. A frequency of the high-frequency drive signal is higher than 23 KHz.
    Type: Grant
    Filed: February 26, 2007
    Date of Patent: June 9, 2009
    Assignee: Delta Electronics, Inc.
    Inventors: Chia-Feng Wu, Yueh-Lung Huang, Ming-Shi Tsai, Wen-Shi Huang
  • Patent number: 7504794
    Abstract: A common electrode plate formed on a common electrode base attached to the lower surface of the movable stage faces a split electrode plate formed on a split electrode base attached to the upper surface of a main base, which are apart from each other at a predetermined interval. A support mechanism formed of ball bearings, ball stoppers at the movable side, steel balls, ball stoppers at the fixed side, and ball bearings allows the movable stage to move in directions of the X-axis, Y-axis and turning. A linear actuator 19 is driven to move the movable stage in the directions of X-axis, Y-axis, and turning.
    Type: Grant
    Filed: November 29, 2006
    Date of Patent: March 17, 2009
    Assignee: Chiba Precision Co., Ltd.
    Inventors: Hideaki Sato, Kennosuke Kondo
  • Patent number: 7446497
    Abstract: A fixed-position stop control apparatus (10) includes: a move-instruction generating means (22) for generating a move instruction for each control cycle; a position loop control means (25) for position controlling a rotation shaft (61) for each control cycle according to the move instruction generated by the move-instruction generating means; and a speed loop control means (35) for speed controlling the rotation shaft according to one of a speed instruction generated by a higher level control apparatus (45) and a predetermined speed instruction, thereby switching the speed control of the rotation shaft by the speed loop control means to the position control of the rotation shaft by the position loop control means. In this fixed-position stop control apparatus, the move instruction generated by the move-instruction generating means has acceleration smaller than the acceleration corresponding to the acceleration and deceleration ability of the rotation shaft.
    Type: Grant
    Filed: December 12, 2006
    Date of Patent: November 4, 2008
    Assignee: Fanuc Ltd
    Inventors: Yasusuke Iwashita, Takahiro Akiyama, Masakazu Niwa
  • Patent number: 7282874
    Abstract: An alignment apparatus which moves a object comprises a first structure having a holding member which holds the object, a second structure having a magnet which constitutes a linear motor, the linear motor drives the first and second structure, and a flow passage formed between the holding member and the magnet.
    Type: Grant
    Filed: January 27, 2006
    Date of Patent: October 16, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yugo Shibata, Atsushi Kimura
  • Patent number: 7237512
    Abstract: To provide a cooling structure which can effectively cool a controller for controlling a drive of a motor in an electric vehicle. A controller cooling structure of an electric vehicle is provided with a motor for supplying power to the rear wheel as the drive wheel, a motor driver for controlling a drive of the motor and a cooling plate for circulating the cooling water into the internal side of the motor driver in order to cool the same. In this controller cooling structure, one surface of the cooling plate is arranged adjacent to the motor driver and the other surface of the same is arranged adjacent to the rear swing arm.
    Type: Grant
    Filed: August 12, 2005
    Date of Patent: July 3, 2007
    Assignee: Honda Motor Co., Ltd.
    Inventors: Kanau Iwashita, Shinji Takayanagi, Hiroyuki Kikuchi
  • Patent number: 7209862
    Abstract: A self-diagnosing system for an encoder. The system includes an encoder circuit for outputting information detected by an encoder; a data preparing section provided in the encoder circuit and preparing data representing a state of an abnormal-state judgment factor in connection with at least one of the encoder and an electric motor combined with the encoder; a signal generating section provided in the encoder circuit and generating an abnormal-state signal when the data prepared in the data preparing section represents an abnormal state of the abnormal-state judgment factor; and a storage section provided in the encoder circuit and storing the data representing a state of the abnormal-state judgment factor when the signal generating section generates the abnormal-state signal. The storage section may store the data prepared in the data preparing section at a desired timing not later than the instant the signal generating section generates the abnormal-state signal.
    Type: Grant
    Filed: February 3, 2005
    Date of Patent: April 24, 2007
    Assignee: Fanuc Ltd
    Inventors: Mitsuyuki Taniguchi, Hirofumi Kikouchi, Hajime Miyamoto
  • Patent number: 7057364
    Abstract: An actuating system having an electric motor that is controlled by a computer as a function of a setpoint position of a member that is to be actuated. The actuating system includes an encoder that is dependent on the movement of the motor, a sensor designed to deliver two square digital position signals in quadrature and which are representative of the position of the encoder, a device for processing the signals and which can determine the actual position of the encoder, and a device for comparing the actual position of the encoder with the position of the encoder that corresponds, in theory, to the applied setpoint. The actuating system can be used to actuate a member and/or actuate a device that meters the amount of fuel provided to a heat engine.
    Type: Grant
    Filed: December 4, 2003
    Date of Patent: June 6, 2006
    Assignee: S.N.R. Roulements
    Inventors: Gérard Ballas, Christophe Nicot
  • Patent number: 6992450
    Abstract: The invention provides an active mass damper by use of which a machining apparatus can be downsized. The active mass damper includes a support unit for supporting a weight movably and horizontally, a motor for driving the weight, and a controller for controlling the motor. A torque command signal to be given to a motor of an X-table and a torque command signal to be given to a motor of a Z-table are put into the controller of the active mass damper so that the motor for driving the weight can be driven by feed-forward control using the torque command signals and feedback control based on the displacement of the weight.
    Type: Grant
    Filed: January 24, 2005
    Date of Patent: January 31, 2006
    Assignee: Hitachi Via Mechanics Ltd.
    Inventors: Kichio Nakajima, Akira Busujima, Yasushi Ito, Nobuhiko Suzuki, Toru Yuki
  • Patent number: 6984947
    Abstract: An apparatus and a method for adjusting components of an optical system, the components including an adjustment device. An electric positioning motor can be engaged onto the adjustment device of the components. An electrical generator is electrically connected to the positioning motor. The generator can be manually operated using an operating element, thereby effecting an adjustment of the component.
    Type: Grant
    Filed: July 17, 2002
    Date of Patent: January 10, 2006
    Assignee: Leica Microsystems Wetzlar GmbH
    Inventor: Wolfgang Sulik
  • Patent number: 6940252
    Abstract: A DC motor control method and apparatus for reducing time required for deceleration without degrading positioning accuracy. In a device which drives a mechanism by using a DC motor as a power source, in deceleration of the DC motor, when the mechanism arrives at a predetermined position, a velocity command value to the motor, generated in accordance with a cubic function having a mild curve profile, is changed to a constant value, thus the velocity is discontinuously reduced.
    Type: Grant
    Filed: January 30, 2002
    Date of Patent: September 6, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventors: Nobutsune Kobayashi, Michiharu Shoji, Hiroyuki Saito
  • Patent number: 6806674
    Abstract: Parameter set 1: T1a, T2a, Fa, Aa, parameter set 2: T1b, T2b, Fb, Ab, and parameter set 3: T1c, T2c, Fc, Ac, which consist of parameters having discrete values in three stages (large, medium and small) are prepared in the memory for example of the CNC 1 or the personal computer 3. For a given parameter set, the set giving priority to accuracy (S=0) is indicated by P (T1p, T2p, Fp, Ap), while the set giving priority to speed (S=1) is indicated by Q (T1q, T2q, Fq, Ag), and interpolation is performed and the parameter set Y=(1−S)×P+S×Q is obtained. The CNC 2 creates operating commands based on set Y and outputs these to the servo control section 2.
    Type: Grant
    Filed: May 31, 2002
    Date of Patent: October 19, 2004
    Assignee: Fanuc Ltd.
    Inventors: Yasusuke Iwashita, Tadashi Okita
  • Publication number: 20040189234
    Abstract: A uniaxial drive unit is provided with a tiltable pulse generating device having a joystick, which generates a continuous pulse of a frequency corresponding to the tilt angle of the joystick, and a rotary encoder having a knob, which generates a pulse of a frequency corresponding to the turning speed of the knob and generates pulses of the number corresponding to the turning angle of the knob to drive a linear motor. High-speed and medium-speed operations are carried out by using the tiltable pulse generating device, and low-speed fine feed is carried out by using the rotary encoder.
    Type: Application
    Filed: March 24, 2004
    Publication date: September 30, 2004
    Applicant: Tokyo Seimitsu Co., Ltd.
    Inventor: Takashi Fukasawa
  • Patent number: 6791293
    Abstract: The invention provides a synchronous motor sensorless controller which drives a synchronous motor without use of a rotational position sensor. The controller has a relative position counter 4 which acquires an estimated position of a magnetic pole from the position-and-speed estimation device simultaneously with resetting a summated value to zero when the reference position signal is input and which starts summation operation; and a speed instruction generator 3 having a position controller 29 which performs position control operation on the basis of a deviation between an instruction value pertaining to the amount of movement from the reference position and a summated value output as a relative position from the relative position counter, the generator outputting a speed instruction. The sensorless controller can position at a predetermined location a synchronous motor not having a position sensor.
    Type: Grant
    Filed: May 8, 2003
    Date of Patent: September 14, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Toshiyuki Kaitani
  • Patent number: 6787768
    Abstract: A single-body structure is presented for use as a tool tip for making modifications and/or collecting measurements on a target object. The single-body structure comprises a first end portion, a second end portion opposite the first portion, and a mid portion between the first and second end portions, wherein a central axis can be defined extending from the first end portion to the second end portion, and wherein the single-body structure has a maximum linear dimension of approximately 50 microns or less. The single-body structure may be comprised of diamond. One of the first and second end portions may have a larger cross sectional area, in a plane perpendicular to the central axis, than does the other of the first and second end portions. One of the first and second end portions may have a larger cross sectional diameter, in at least one direction perpendicular to the central axis, than does the other of the first and second end portions.
    Type: Grant
    Filed: March 7, 2002
    Date of Patent: September 7, 2004
    Assignee: General Nanotechnology LLC
    Inventors: Victor B. Kley, Robert T. LoBianco
  • Patent number: 6750625
    Abstract: A high accuracy stage supported in six degrees of freedom by electromagnetic bearings. Movements in the horizontal plane of the stage are controlled by variable reluctance actuators which are mounted between the high accuracy stage and a coarse stage so as not to distort the high accuracy stage during movements thereof. The high accuracy stage is supported in three vertical degrees of freedom by electromagnetic actuators disposed between the coarse stage and the high accuracy stage and aided by a supplemental vertical support disposed adjacent to the actuators. Preferably, the high accuracy stage is suspended from a bar supported by the supplemental vertical support, which is preferably air bellows.
    Type: Grant
    Filed: August 15, 2001
    Date of Patent: June 15, 2004
    Assignee: Nikon Corporation
    Inventors: Michael Binnard, Kazuya Ono, Andrew J. Hazelton
  • Patent number: 6725105
    Abstract: The present invention is a control system for conditioning movement of a work implement during a work cycle. In one embodiment, the control system comprises an electronic-hydraulic valve connected to the work implement and a computer system having a central processing unit and a memory device. The control system further comprises a mode control module stored on the memory device. The mode control module is generally adapted to detect whether the control handle of the work implement is signaling for operating in a smooth mode or an abrupt mode, and to output a control signal to the electronic-hydraulic valve to control operation of the work implement during the smooth mode or the abrupt mode. The mode control module comprises a smooth mode module and an abrupt mode module. The smooth mode module and the abrupt mode module are adapted to optimize movement of the work cycle during the smooth mode, and abrupt mode, respectively.
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: April 20, 2004
    Assignee: Caterpillar Inc
    Inventors: John E. Francis, Mark D. Shane
  • Patent number: 6707269
    Abstract: Method and apparatus for controlling a motor. A digital to analog converter (DAC) converts input digital values to corresponding analog voltages over a range of different selectable dynamic operating ranges. A first motor adjustment signal within a first dynamic range of the DAC is generated in relation to a velocity error of the motor, and applied to the DAC to control flow of current through the motor. The DAC is adjusted to a different, second dynamic range when the first motor adjustment signal is proximate an upper end or a lower end of the first dynamic range. Expanding the dynamic range allows greater amounts of current to be applied to the motor; contracting the dynamic range provides higher resolution (volts/count) and greater stability. The different ranges are automatically selected for different motor load conditions.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: March 16, 2004
    Assignee: Seagate Technology LLC
    Inventor: Triet M. Tieu
  • Patent number: 6563283
    Abstract: Where high control precision is required in contour control or the like, mode B for a short PWM period is selected to assure a high control precision. Where high torque is required in fast feed, high acceleration or deceleration, mode A for long PWM period is selected so as to decrease the rate of the time of dead zone &dgr; where voltage is not applied to the motor.
    Type: Grant
    Filed: March 29, 2001
    Date of Patent: May 13, 2003
    Assignee: Fanuc Ltd.
    Inventors: Yasusuke Iwashita, Hiroyuki Kawamura
  • Patent number: 6478434
    Abstract: An actuator is configured to reliably provide fine and coarse positioning or adjusting for objects such as a telescope or other technical or scientific instrument or communication components, preferably at cryogenic as well as higher temperatures. The actuator includes a fine positioning system and a selectively engageable coarse positioning system. The fine positioning system includes a flexure structure constructed to provide support and strength, preferably in all axes, such as may be needed to withstand launch forces. Preferably flexure axes are defined at upper and lower edges of sidewalls and at intermediate positions of sidewalls. A cam or other suitable device adjusts distance between sidewall intermediate flexures and, by operation of sidewall flexures, adjusts the distance between upper and lower surfaces.
    Type: Grant
    Filed: November 9, 1999
    Date of Patent: November 12, 2002
    Assignee: Ball Aerospace & Technologies Corp.
    Inventors: Scott A. Streetman, Lana Kingsbury
  • Patent number: 6430465
    Abstract: The present invention preferably employs non-contact, small-displacement, capacitive sensors to determine Abbe errors due to the pitch, yaw, or roll of a near linear mechanical stage that are not indicated by an on-axis position indicator, such as a linear scale encoder or laser interferometer. The system is calibrated against a precise reference standard so the corrections depend only on sensing small changes in the sensor readings and not on absolute accuracy of the sensor readings. Although the present invention is preferred for use in split-axis positioning systems with inertially separated stages, the invention can be employed in typical split-axis or stacked stage systems to reduce their manufacturing costs.
    Type: Grant
    Filed: January 5, 2001
    Date of Patent: August 6, 2002
    Assignee: Electro Scientific Industries, Inc.
    Inventor: Donald R. Cutler
  • Patent number: 6408216
    Abstract: The present invention provides a position control apparatus in which a motor output torque can be approximated to that of the maximum output torque curve of the motor by generating a position command combining constant acceleration and exponential acceleration. This position control apparatus comprises means for generating a position command so as to give constant acceleration by adding an acceleration unit quantity &Dgr;Naa, set as a parameter beforehand, to a speed unit quantity N(n), means for generating a position command by calculating an acceleration unit quantity using an exponential function expression and by adding the calculated result to the speed unit quantity N(n), and means for generating a position command by comparing the present speed unit quantity N(n) and a function change speed unit quantity Nc set as a parameter beforehand and by selecting either of the command generating means described above on the basis of the compared result.
    Type: Grant
    Filed: May 17, 1999
    Date of Patent: June 18, 2002
    Assignee: Okuma Corporation
    Inventor: Mitsuaki Adachi
  • Patent number: 6320343
    Abstract: A circuit to establish an accurate instantaneous position of a DC motor rotor includes an input terminal to receive a rotor position signal. A first counter circuit counts to a value between two successive rotor position signals at a slow clock rate, and stores this count value in a register. Then a second counter begins counting from zero at a system clock rate, which is faster than the slow clock rate. The first counter circuit and the second counter circuit are evaluated by a comparator, and when the counters equal one another, the instantaneous position signal is generated. Alternately, the second counter can be a down-counter that is initially loaded with the count value, and the instantaneous position signal is generated when the second counter reaches zero.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: November 20, 2001
    Assignee: STMicroelectronics S.r.l.
    Inventor: Marco Viti
  • Patent number: 6320345
    Abstract: A command trajectory drives a stage to produce a smooth motion while minimizing any vibrations or oscillations of the structure. The command trajectory provides an acceleration and a deceleration that have derivatives, known as the jerk, equal to zero at the beginning and end of the acceleration and deceleration periods. Because the jerk is equal to zero at the beginning and end of acceleration and deceleration, the influence of the reactive forces on the positioning system's structure is reduced, thereby minimizing oscillation of the structure. Moreover, the jerk is continuous throughout the acceleration and deceleration periods, resulting in a smooth continuous motion of the stage. The jerk on the stage during acceleration and deceleration has an adjustable duration to reduce the structural disturbances and decrease settling time.
    Type: Grant
    Filed: March 5, 1998
    Date of Patent: November 20, 2001
    Assignee: Nikon Corporation
    Inventors: Bausan Yuan, Kazuaki Saiki, Henry Kwok Pang Chau
  • Patent number: RE45898
    Abstract: A method of and system for directional drilling reduces the friction between the drill string and the well bore. A downhole drilling motor is connected to the surface by a drill string. The drilling motor is oriented at a selected tool face angle. The drill string is rotated at said surface location in a first direction until a first torque magnitude without changing the tool face angle. The drill string is then rotated in the opposite direction until a second torque magnitude is reached, again without changing the tool face angle. The drill string is rocked back and forth between the first and second torque magnitudes.
    Type: Grant
    Filed: March 30, 2013
    Date of Patent: February 23, 2016
    Assignee: Schlumberger Technology Corporation
    Inventors: Eric E. Maidla, Marc Haci