Digital Comparison Patents (Class 318/601)
  • Patent number: 10693395
    Abstract: The disclosure provides an apparatus and method of compensating for a torque of a motor. The apparatus includes a torque information collector configured to collect steering information, motor position information, and predetermined motor information, a torque ripple calculator configured to determine a target torque based on the steering information and to determine a compensation torque for torque ripple based on the target torque and the motor information, a compensation current calculator configured to determine a compensation current value based on the motor information and the compensation torque, a current value generator configured to convert the target torque into a target current value and to generate an output current value based on the target current value and the compensation current value, and a current signal output configured to output a current control signal corresponding to the output current value.
    Type: Grant
    Filed: January 31, 2019
    Date of Patent: June 23, 2020
    Assignee: MANDO CORPORATION
    Inventor: Jong Hoon Lee
  • Patent number: 10384893
    Abstract: A sheet conveying apparatus includes a controller to set conveyance speeds of first, second, and third conveyance rotary members. The controller sets the conveyance speed of a sheet by the second conveyance rotary member to a first conveyance speed, which is the same as a conveyance speed of the sheet by the first conveyance rotary member, and a second conveyance speed which is different from the first conveyance speed. When the controller sets the conveyance speed of the sheet by the first conveyance rotary member to the first conveyance speed and sets the conveyance speed of the sheet by the second conveyance rotary member to the second conveyance speed, the controller sets the conveyance speed of the sheet by the third conveyance rotary member to a third conveyance speed which is a speed between the first conveyance speed and the second conveyance speed.
    Type: Grant
    Filed: March 15, 2018
    Date of Patent: August 20, 2019
    Assignee: Canon Finetech Nisca Inc.
    Inventor: Bungo Hasegawa
  • Patent number: 10338563
    Abstract: A numerical control device comprises a command position calculation section that calculates command position information based on a machining program; a command path calculation section that calculates command path information based on the command position information; an estimated actual position calculation section that calculates estimated actual position information based on the command position information and transmission characteristic information; an estimated actual path calculation section that calculates estimated actual path information based on the estimated actual position information; a path error calculation section that calculates path error based on the command path information and the estimated actual path information; a machining time calculation section that calculates a machining time based on the estimated actual path information; a jerk calculation section that calculates jerk based on the estimated actual position information; and an evaluation position calculation section that calcul
    Type: Grant
    Filed: November 7, 2017
    Date of Patent: July 2, 2019
    Assignee: FANUC CORPORATION
    Inventor: Junichi Tezuka
  • Patent number: 10333445
    Abstract: Technical solutions are described for providing torque ripple compensation when a motor control system is operating in feedforward mode. An example motor control system includes a feedforward controller that receives a first current command corresponding to an input torque command, and receives a second current command corresponding to a torque ripple. The feedforward controller generates a voltage command based on the first current command and the second current command, the voltage command being applied to a motor.
    Type: Grant
    Filed: November 22, 2017
    Date of Patent: June 25, 2019
    Assignee: STEERING SOLUTIONS IP HOLDING CORPORATION
    Inventors: Prerit Pramod, Infane Lowe, Krishna MPK Namburi, Varsha Govindu
  • Patent number: 10166871
    Abstract: A wheel stability control system for an electric vehicle including an electric motor, a drive inverter, and an electronic control unit (ECU) including a computer readable, non-transitory memory (memory) and an electronic processing unit (EPU). The memory stores information including an optimal acceleration and deceleration curve and the electrical characteristics of the electric motor. The EPU calculates the electrical moment of the electric motor from inputs from the drive inverter and the electrical characteristics of the electric motor. The ECU compares the electrical moment and the angular speed of the motor with the optimal acceleration and deceleration curve, and if the acceleration or deceleration of the electric motor is out of a predetermined range when compared to the optimal acceleration and the optimal deceleration, it reduces the electrical moment applied by the electric motor.
    Type: Grant
    Filed: September 2, 2015
    Date of Patent: January 1, 2019
    Assignee: Robert Bosch GmbH
    Inventor: Markus Bachmann
  • Patent number: 10071894
    Abstract: Various embodiments provide a material handling vehicle (MHV) and associated method provide for damping of mast oscillations of a mast of the MHV. In one approach, mast oscillations can be detected and/or anticipated and a countering force can be generated by an elevated reach actuator of the MHV to damp the oscillations.
    Type: Grant
    Filed: August 2, 2016
    Date of Patent: September 11, 2018
    Assignee: The Raymond Corporation
    Inventor: Fernando D Goncalves
  • Patent number: 10060173
    Abstract: Barrier operator systems and methods of operation include a mechanical drive subsystem with a segmented and self-locking rail unit, rail mounting supports, belt and chain drive tensioning, and drive assembly carriage and interface; electronics and software routines for controlling operation of the various barrier operator functions; wall console communicating with the barrier operator; encryption and decryption of access codes; establishment and monitoring of travel limits and barrier speed and force profiles; thermal protection of barrier operator drive motors; and establishment and control of wireless communications from the barrier operator to accessories.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: August 28, 2018
    Assignee: Overhead Door Corporation
    Inventors: Leroy G. Krupke, Mark Kenneth Siegesmund, Mark Raymond Wilzbach
  • Patent number: 10005166
    Abstract: In order to provide a tool changer that can detect an entry of a foreign substance into a turret mechanism portion or wear of a turret mechanism part, a tool changer of the present invention includes a reference phase false detection sensing portion that monitors load variations which occur in a turret drive source and detects an entry of a foreign substance into the turret mechanism portion based on a difference between the load variations and a reference load used as a reference. Moreover, the reference phase false detection sensing portion can also detect the progress of wear of the turret mechanism part based on the integral of the absolute value of a difference between the load variations which occur in the turret drive source and the reference load used as a reference.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: June 26, 2018
    Assignee: FANUC CORPORATION
    Inventor: Yasuyuki Yamamoto
  • Patent number: 9523548
    Abstract: Methods, computer-readable media, and systems are disclosed for controlling a turret assembly with two or more gimbaled, swivel assembly sub-systems, such as a gimbaled gun and a gimbaled electro-optical sensor. The turret can be automatically slewed in response to one of the swivel assemblies rotating. A user can switch turret modes reflecting a priority between the gimbaled sub-systems system so that one takes priority over the other(s) during a mission.
    Type: Grant
    Filed: May 27, 2015
    Date of Patent: December 20, 2016
    Assignee: DRS Sustainment Systems, Inc.
    Inventors: Michael T. Fox, Bruce E. Exely, Michael C. Mareschal, Thomas D. Linton
  • Patent number: 9296078
    Abstract: A cutter switching system includes a supporting platform, a cutter magazine mounted on the supporting platform, and a sensing assembly mounted on the cutter magazine. The cutter magazine includes a cutter storing frame and a driving assembly. The cutter storing frame includes a cylindrical main body, and a plurality of cutters mounted all around the main body. The driving assembly includes a cam indexer engaging with the cutter storing frame for rotating the cutter storing frame. The sensing assembly is mounted on the cam indexer, and the sensor senses the rotation of the cam indexer to establish the static position and the rotation required of the cutter magazine. The present disclosure further provides a machine tool using the cutter switching system.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: March 29, 2016
    Assignees: HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD., HON HAI PRECISION INDUSTRY CO., LTD.
    Inventors: Xian-Cai Zeng, Dong-Cheng Liu, Chin-Tsan Huang
  • Patent number: 9102027
    Abstract: A machine tool which processes a machine target object using a main shaft which revolves, the machine tool includes a support portion which supports the main shaft; a first driving unit which revolves the main shaft about a first axis; a second driving part which feeds the main shaft from the support portion in a direction of the first axis; a control part which changes an upper limit value of a revolution speed of the main shaft according to a feeding length of the main shaft fed from the support portion; and a memory unit which associates and stores the upper limit value of the revolution speed and the feeding length.
    Type: Grant
    Filed: February 1, 2012
    Date of Patent: August 11, 2015
    Assignee: Toshiba Kikai Kabushiki Kaisha
    Inventors: Toshiya Ishikawa, Atsushi Tada, Masato Tominaga
  • Patent number: 9089944
    Abstract: A device, a tool, and a method for machining, especially polishing, of an optical lens by means of a tool are proposed, an information medium on one working surface of the tool being optically acquired and removed as the lens is machined and thus the state of the tool being indicated.
    Type: Grant
    Filed: November 14, 2011
    Date of Patent: July 28, 2015
    Assignee: Schneider GmbH & Co. KG
    Inventor: Gunter Schneider
  • Patent number: 9061701
    Abstract: A control method for an electric power steering system is provided. The method includes providing a power steering control signal; providing a disturbance cancel command; varying at least one filter based on a frequency of the disturbance cancel command; applying the at least one varied filter to the disturbance cancel command to generate a compensation signal; applying the compensation signal to the power steering control signal to generate a compensated control signal; and controlling the power steering system based on the compensated control signal.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: June 23, 2015
    Assignee: Steering Solutions IP Holding Corporation
    Inventors: Michael K. Hales, Anthony J. Champagne
  • Patent number: 9035583
    Abstract: The system has a driving circuit for the motor of the electric fan, coupled to the electrical system of a motor vehicle and having a plurality of controlled electronic switches, and an electronic control unit arranged to control the driving circuit in such a way as to cause the flow in the motor of a variable average current capable of producing a required speed of rotation, in accordance with a predetermined relationship or function. The control unit is designed to store a predetermined threshold of rotation speed, and to control the motor through the associated driving circuit in such a way that when the rotational speed of the motor exceeds the threshold the driving circuit causes electrical braking of the motor.
    Type: Grant
    Filed: December 13, 2011
    Date of Patent: May 19, 2015
    Assignee: GATE S.R.L.
    Inventors: Davide Cerrato, Pierfranco Pangella
  • Publication number: 20150091489
    Abstract: An apparatus for finding a machine tool origin includes a base and a sensor positioned on a first side of the base. The sensor includes probe engagement components and electronic circuitry. The probe engagement components are configured for movable engagement with a probe of the machine tool to produce electronic signals processed by the electronic circuitry to provide a signal indicative of the machine tool origin. Mechanical positioning components are positioned on a second side of the base. The mechanical positioning components include a pedestal with a first tab and a second tab aligned to be operable as a mechanical stop with the second tab corresponding to the position of a right-hand origin for the machine tool and the second tab and a third tab aligned to be operable as a mechanical stop with the second tab corresponding to the position of a left-hand origin for the machine tool.
    Type: Application
    Filed: October 2, 2013
    Publication date: April 2, 2015
    Applicant: BENEFICIAL PHOTONICS, INC.
    Inventors: George Benedict, Susan Coleman
  • Patent number: 8988032
    Abstract: A numerical controller capable of visually and accurately analyzing a change of the tool trajectory before and after changing a processing condition, whereby a parameter of a drive axis can be properly adjusted. The numerical controller comprises a numeric controlling part which controls each drive axis based on a predetermined position command; a position data obtaining part which obtains position data of each drive axis controlled by the numerical controlling part; a tool coordinate calculating part which calculates a coordinate of a tool center point based on position feedback or obtained position data of each drive axis and information of a mechanical structure of a machine tool; a tool trajectory storing part which stores the calculated coordinate of the tool center point as a feedback trajectory; and a displaying part which displays the stored feedback trajectory on a display.
    Type: Grant
    Filed: August 2, 2012
    Date of Patent: March 24, 2015
    Assignee: FANUC Corporation
    Inventors: Yasusuke Iwashita, Hajime Ogawa
  • Publication number: 20150061564
    Abstract: A command value generating circuit determines an acceleration profile indicating changes in acceleration of a mechanical load over time. The acceleration profile is determined such that the mechanical load is accelerated from a stop at a first position to a peak velocity, and is decelerated from the peak velocity to stop at a second position, and that the absolute value of an acceleration during accelerating and decelerating the mechanical load is equal to or less than an upper limit acceleration, and that the acceleration is maintained at the upper limit acceleration for a period of time from starting to accelerate the mechanical load, and then, gradually decreased from the upper limit acceleration. The command value generating circuit determines a velocity profile indicating changes in the velocity of the mechanical load over time, according to the acceleration profile, and generates a position command value, according to the velocity profile.
    Type: Application
    Filed: February 25, 2013
    Publication date: March 5, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Koichiro Ueda
  • Patent number: 8922150
    Abstract: A microcontroller chip includes a serial data transmitter having a serial data output pin and an inverter having an input pin and an output pin, the input pin connected to the serial data output pin of the serial data transmitter, the output pin of the inverter and the output pin of the serial data transmitter forming a differential serial data transmission line.
    Type: Grant
    Filed: July 18, 2012
    Date of Patent: December 30, 2014
    Assignee: The Johns Hopkins University
    Inventor: Harry A. Eaton
  • Patent number: 8912740
    Abstract: A actuator driver includes a digital filter configured to perform phase compensation of a digital torque command signal using a fed-back digital signal; a digital PWM generator configured to generate a plurality of pulse-width modulated PWM control signals in response to an output of the digital filter; at least one H bridge configured to select and output a first or second terminal voltage in response to the plurality of PWM control signals; first and second continuous time ?? A/D converters configured to convert the first and second terminal voltages from analog to digital, respectively; and a feed-back filter configured to decimate outputs of the first and second continuous time ?? A/D converters to feed back the digital signal to the digital filter.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: December 16, 2014
    Assignee: Panasonic Corporation
    Inventors: Akira Kawabe, Kouji Okamoto, Fumiaki Senoue, Hitoshi Kobayashi, Kiyotaka Tanimoto, Hideki Nishino, Shiro Sakiyama, Takashi Morie, Akio Yokoyama
  • Patent number: 8884572
    Abstract: 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.
    Type: Grant
    Filed: October 1, 2012
    Date of Patent: November 11, 2014
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Hironobu Yoshitake, Toshikazu Sakata
  • Patent number: 8878478
    Abstract: A projector includes: a drive motor adapted to drive a lens unit; a control section adapted to control the drive motor; a storage section adapted to store a target position of the lens unit; and a position detector adapted to detect a present position of the lens unit, wherein if a deviation between the target position stored in the storage section and the present position detected by the position detector is equal to or larger than a predetermined value, the control section performs drive of the drive motor with feedforward control until the present position and the target position are coincident with each other, and performs drive control of the drive motor with a predetermined unit based on a deviation between a stop position by the feedforward control and the target position.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: November 4, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Shinichi Tsukagoshi
  • Patent number: 8836266
    Abstract: A small motor controller (SMC) system includes a motor configured to control a position of a rotor, a sensor configured to detect position information of the rotor by detecting a feature on the rotor, the sensor including a detection zone having a first side and a second side, and a motor control unit. The motor control unit is configured to determine a position of the rotor corresponding to one of the first side of the detection zone and the second side of the detection zone based on whether the feature on the rotor is detected crossing the first side or the second side, respectively.
    Type: Grant
    Filed: July 18, 2012
    Date of Patent: September 16, 2014
    Assignee: The Johns Hopkins University
    Inventors: Kapil D Katyal, Matthew P. Para, Andrew J. Harris, Harry A. Eaton
  • Patent number: 8810183
    Abstract: A PWM-signal-output circuit includes a detecting unit to detect periods in which a speed signal with logic level changing alternately and having a period corresponding to a motor-rotation speed is at one and the other logic levels, a dividing unit to divide each of the periods into first to third periods; a first output unit to change a PWM-signal duty-cycle in a stepwise manner toward an input-signal duty-cycle in the first period, a second output unit to cause a PWM-signal duty-cycle to become equal to an input-signal duty-cycle, to maintain a current flowing through the motor coil constant, in the second period; and a third output unit to change a PWM-signal duty-cycle in a stepwise manner from an input-signal duty-cycle, to decrease a current flowing through the motor coil, in the third period.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: August 19, 2014
    Assignee: Semiconductor Components Industries, LLC
    Inventor: Takashi Ogawa
  • Patent number: 8767364
    Abstract: When a short-circuited FET is identified as one of low-side FETs, maximum phase voltages of three phases are detected when a steering operation is performed by a driver, and the detected maximum phase voltages of the three phases are compared with one another to identify a short-circuit phase. On the other hand, when a short-circuited FET is identified as one of high-side FETs, minimum phase voltages of the three phases are detected when a steering operation is performed by the driver, and the detected minimum phase voltages of the three phases are compared with one another to identify a short-circuit phase.
    Type: Grant
    Filed: June 14, 2012
    Date of Patent: July 1, 2014
    Assignee: JTEKT Corporation
    Inventor: Shigekazu Okumura
  • Patent number: 8716972
    Abstract: A motor control apparatus includes a power converter, a speed controller, and a stop position controller. The power converter outputs a current to drive a motor based on a torque command. The speed controller generates the torque command based on an error between a speed command of the motor and a speed of the motor. The stop position controller calculates an acceleration command to output a predetermined torque after detection of a reference position per revolution of a position detector for a first time during speed control of the motor, generates a torque feed-forward command based on the acceleration command, generates a position command based on the acceleration command, and generates the speed command based on an error between the position command and the motor position to execute position control of the motor.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: May 6, 2014
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Seitaro Ohta, Jun Hagihara, Takeshi Arimatsu
  • Patent number: 8710787
    Abstract: A servomotor control circuit for an air conditioner apparatus of a vehicle includes a drive control section for controlling drive of a servomotor so that the servomotor attains a target stop position, a rotation position change detection section for detecting a change in the rotation position of the servomotor, and an operation limit check section for checking, based on the change in the rotation position of the servomotor, whether the servomotor has attained the operation limit position. The drive control section stops drive of the servomotor without reception of a servomotor drive stop command produced from a main control apparatus, when the servomotor is determined as having attained the operation limit position.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: April 29, 2014
    Assignee: Denso Corporation
    Inventor: Nobuaki Koshobu
  • Patent number: 8706369
    Abstract: A closed loop shift control apparatus and method based on estimated torque in friction elements controls a torque transfer phase when shifting from a low gear configuration to a high gear configuration for an automatic transmission system. When pressure actuated friction elements are selectively engaged and released to establish torque flow paths in the transmission, estimates of torsional load exerted on the off-going friction element are used to predict the optimal off-going friction element release timing for achieving a consistent shift feel. The estimated torque is preferably calculated by using estimated torque signals generated as a function of speed measurements represented either the engine speed and turbine output speed or transmission output speed and wheel speed under dynamically changing conditions.
    Type: Grant
    Filed: July 23, 2013
    Date of Patent: April 22, 2014
    Assignee: Ford Global Technologies, LLC
    Inventors: Diana Yanakiev, Yuji Fujii, Eric Tseng, Gregory Michael Pietron, Joseph F Kucharski
  • Publication number: 20140025182
    Abstract: A small motor controller (SMC) system includes a motor configured to control a position of a rotor, a sensor configured to detect position information of the rotor by detecting a feature on the rotor, the sensor including a detection zone having a first side and a second side, and a motor control unit. The motor control unit is configured to determine a position of the rotor corresponding to one of the first side of the detection zone and the second side of the detection zone based on whether the feature on the rotor is detected crossing the first side or the second side, respectively.
    Type: Application
    Filed: July 18, 2012
    Publication date: January 23, 2014
    Applicant: THE JOHNS HOPKINS UNIVERSITY
    Inventors: Kapil D. Katyal, Matthew P. Para, Andrew J. Harris, Harry A. Eaton
  • Publication number: 20130049670
    Abstract: An integrated servo system and a method of controlling a motor is provided. The integrated servo system includes a position detector which determines original position data of a motor and a position signal processor which determines a position of the motor based on the determined position data. The integrated servo system further includes a servo controller circuit which controls the motor based on the determined position data and a parallel bus through which the determined position data is transmitted from the position signal processor to the servo controller circuit.
    Type: Application
    Filed: August 26, 2011
    Publication date: February 28, 2013
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Kei TERADA
  • Patent number: 8373370
    Abstract: The present invention provides a position sensorless control method of a high performance permanent magnet synchronous motor during emergency operation, which can accurately detect a magnetic pole position of the synchronous motor based on a position sensorless vector control using an adaptive observer configured based on a permanent magnet synchronous motor model.
    Type: Grant
    Filed: July 2, 2010
    Date of Patent: February 12, 2013
    Assignees: Hyundai Motor Company, Kia Motors Corporation, Postech Academy-Industry Foundation
    Inventors: Soon Woo Kwon, Seo Ho Choi, Joon Yong Lee, Kwang Hee Nam, Jin Seok Hong, Sung Yoon Jung, Tae Heon Kim
  • Publication number: 20120229069
    Abstract: A motor control apparatus includes a power converter, a speed controller, and a stop position controller. The power converter outputs a current to drive a motor based on a torque command. The speed controller generates the torque command based on an error between a speed command of the motor and a speed of the motor. The stop position controller calculates an acceleration command to output a predetermined torque after detection of a reference position per revolution of a position detector for a first time during speed control of the motor, generates a torque feed-forward command based on the acceleration command, generates a position command based on the acceleration command, and generates the speed command based on an error between the position command and the motor position to execute position control of the motor.
    Type: Application
    Filed: November 4, 2011
    Publication date: September 13, 2012
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Seitaro OHTA, Jun HAGIHARA, Takeshi ARIMATSU
  • Patent number: 8228011
    Abstract: The present invention discloses a bi-direction driver IC and a method for bi-directionally driving an object. The method comprises: providing a first and a second integrated circuit (IC) chips, coupled with an object to be driven, wherein each of the first and second IC chips is capable of single-directionally driving the object; providing a reverse current path in each of the first and second IC chips; driving the object in a first direction by the first IC chip, wherein current flows through the reverse current path in the second IC chip; and driving the object in a second direction by the second IC chip, wherein current flows through the reverse current path in the first IC chip.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: July 24, 2012
    Assignee: Chip Goal Electronics Corporation
    Inventor: Hui-Yen Hsieh
  • Patent number: 8212515
    Abstract: A microcomputer which obtains a rotor position signal from a biphase signal delivered by a resolver mounted on an electric motor according to a rotation phase of a rotor relative to a stator, thereby controlling the motor based on the rotor position signal. The microcomputer includes a digital signal converter which is configured by hardware and converts the biphase signal delivered from the resolver into a digital data position signal, the digital signal converter being mounted on a single chip.
    Type: Grant
    Filed: July 13, 2009
    Date of Patent: July 3, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yukihisa Hasegawa, Takehiro Hara
  • Publication number: 20120081063
    Abstract: A motor control device comprises: an acceleration upper limit estimating unit; a target acceleration setting unit; a motor control unit; and a deficit calculating unit, wherein the target acceleration setting unit corrects the target acceleration based on the acceleration profile by an amount corresponding to the acceleration deficit within a range in which the target acceleration does not exceed the acceleration upper limit on the basis of the acceleration deficit calculated by the deficit calculating unit to set the target acceleration at each time.
    Type: Application
    Filed: September 22, 2011
    Publication date: April 5, 2012
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventor: Kenichi IESAKI
  • Publication number: 20120007539
    Abstract: In order to obtain an NC device that can easily shift by an arbitrary amount a main spindle single-revolution reference signal without being dependant on hardware and while rotating a main spindle, the NC device includes a main spindle reference angle correction amount setting unit for inputting a correction angle of a reference point, a main spindle within-single-revolution feed-back position correction unit for correcting the reference point by a correction angle set by the main spindle reference angle correction amount setting unit, and a main spindle within-single-revolution command position correction unit for correcting a main spindle within-single-revolution command position by the correction angle set by the main spindle reference angle correction amount setting unit.
    Type: Application
    Filed: March 31, 2009
    Publication date: January 12, 2012
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Aya Katou, Yoshinori Yamada
  • Patent number: 8054018
    Abstract: A method of constant airflow control for a ventilation system is disclosed. The method includes various controls to accomplish a substantially constant airflow rate over a significant change of the static pressure in a ventilation duct. One control is a constant I·RPM control, which is primarily used in a low static pressure range. Another control is a constant RPM control, which is primarily used in a high static pressure range. These controls requires neither a static pressure sensor nor an airflow rate sensor to accomplish substantially constant airflow rate while static pressure changes. This is because these controls use only intrinsic control variables which are electric current and rotational speed of the motor. Also, the method improves the accuracy of the control by correcting certain deviations that are caused by the motor's current-RPM characteristics. To compensate the deviation, the method adopts a test operation in a minimum static pressure condition.
    Type: Grant
    Filed: January 18, 2008
    Date of Patent: November 8, 2011
    Assignee: SNTech Inc.
    Inventor: Young-Chun Jeung
  • Publication number: 20110241593
    Abstract: A projector includes: a drive motor adapted to drive a lens unit; a control section adapted to control the drive motor; a storage section adapted to store a target position of the lens unit; and a position detector adapted to detect a present position of the lens unit, wherein if a deviation between the target position stored in the storage section and the present position detected by the position detector is equal to or larger than a predetermined value, the control section performs drive of the drive motor with feedforward control until the present position and the target position are coincident with each other, and performs drive control of the drive motor with a predetermined unit based on a deviation between a stop position by the feedforward control and the target position.
    Type: Application
    Filed: April 1, 2011
    Publication date: October 6, 2011
    Applicant: Seiko Epson Corporation
    Inventor: Shinichi Tsukagoshi
  • Patent number: 8030864
    Abstract: A motor drive circuit includes a first amplifier circuit to amplify a difference between first and second position detection signals with a gain becoming smaller according to drop in power supply voltage, to output a first amplification signal, the first and second position detection signals being signals indicating a rotational position of a rotor in a motor, having a frequency corresponding to a rotation speed of the motor, and being opposite in phase to each other; a second amplifier circuit to amplify the difference between the first and second position detection signals with the gain, to output a second amplification signal opposite in phase to the first amplification signal; and a drive circuit to amplify the difference between the first amplification signal and the second amplification signal with a predetermined gain to be saturated at the power supply voltage, to output a driving voltage for driving the motor.
    Type: Grant
    Filed: June 11, 2009
    Date of Patent: October 4, 2011
    Assignees: Sanyo Semiconductor Co., Ltd., Semiconductor Components Industries, LLC
    Inventors: Toshiyuki Imai, Takahiro Iida, Joji Noie
  • Patent number: 8013561
    Abstract: A driving mechanism comprises a fixed housing, a movable housing on which an object to be driven is mounted and a driving motor which is operative to drive the movable housing to move linearly as well as to rotate relative to the fixed housing. An inductance-type encoder determines both linear and rotary displacement of the movable housing relative to the fixed housing, whereby to provide closed-loop control of the position of the object in both linear and rotary directions.
    Type: Grant
    Filed: September 9, 2008
    Date of Patent: September 6, 2011
    Assignee: ASM Assembly Automation Ltd
    Inventors: Wai Chuen Gan, Gary Peter Widdowson
  • Patent number: 8013562
    Abstract: A driving mechanism comprises a fixed housing, a movable housing on which an object to be driven is mounted and a driving motor which is operative to drive the movable housing to move linearly as well as to rotate relative to the fixed housing. An inductance-type encoder determines both linear and rotary displacement of the movable housing relative to the fixed housing, whereby to provide closed-loop control of the position of the object in both linear and rotary directions.
    Type: Grant
    Filed: September 9, 2009
    Date of Patent: September 6, 2011
    Assignee: ASM Assembly Automation Ltd
    Inventors: Wai Chuen Gan, Gary Peter Widdowson, Shiqiang Yao, Siu Yan Ho, Hon Yu Peter Ng
  • Patent number: 7911171
    Abstract: In a device, such as measuring or control signal transmitter, generating an analog current or voltage output signal, absolute values of output variables are continuously measured and regulated to ensure the correctness of the signal. The actual current or voltage value of an analog output signal is measured and digitized (206), a difference (e) between the digitized actual current or voltage value and the desired current or voltage value is defined (300), and the generation (200, 202, 204, 205) of the analog output signal is controlled (304) by means of a digital control signal (Enable, Direction) so as to decrease the difference.
    Type: Grant
    Filed: January 22, 2008
    Date of Patent: March 22, 2011
    Assignee: Abb Oy
    Inventor: Erkki Miettinen
  • Publication number: 20110057599
    Abstract: A trajectory display device capable of correctly quantifying an error of a three-dimensional trajectory of a machine tool, and displaying or outputting the error. The trajectory display device has a command line segment defining part adapted to define a command line segment which connects two temporally adjacent points, in relation to each commanded position; an error calculating part adapted to define a normal line extending from the actual position to each command line segment and calculate an error of the actual position relative to a commanded trajectory, the error being determined as a shorter one between a length of a shortest normal line among the defined normal lines and a length of a line segment extending from the actual position to a commanded position which is the nearest from the actual position.
    Type: Application
    Filed: June 24, 2010
    Publication date: March 10, 2011
    Applicant: FANUC LTD
    Inventors: Yasusuke IWASHITA, Tadashi Okita, Junichi Tezuka, Kazuyuki Sugiyama
  • Publication number: 20100291853
    Abstract: A servomotor control circuit for an air conditioner apparatus of a vehicle includes a drive control section for controlling drive of a servomotor so that the servomotor attains a target stop position, a rotation position change detection section for detecting a change in the rotation position of the servomotor, and an operation limit check section for checking, based on the change in the rotation position of the servomotor, whether the servomotor has attained the operation limit position. The drive control section stops drive of the servomotor without reception of a servomotor drive stop command produced from a main control apparatus, when the servomotor is determined as having attained the operation limit position.
    Type: Application
    Filed: May 12, 2010
    Publication date: November 18, 2010
    Applicant: DENSO CORPORATION
    Inventor: Nobuaki Koshobu
  • Patent number: 7813978
    Abstract: A method for tracking and approving legal expenses incurred by a business entity using a legal budgeting computer system is provided. The method includes creating a legal matter reflecting legal work to be performed by an outside counsel, creating a purchase order for the legal matter including a budgeted amount which is expected to be paid to the outside counsel for performing the legal work, receiving from the outside counsel an invoice, and prompting an account manager to designate a method of reimbursement for the invoice including at least one of paid at close, charge to good faith, charge to loan, customer to wire money, and a non-reimbursable charge to cost center. The method also includes submitting the invoice to an approval process, validating the approved invoice amount, paying the approved invoice amount, and automatically reconciling the approved invoice amount.
    Type: Grant
    Filed: May 3, 2004
    Date of Patent: October 12, 2010
    Assignee: GE Corporate Financial Services, Inc.
    Inventors: Preston H. Abbott, Patricia Anne Hussey, Carolyn Katherine Amone, Prasanna Ramaswamy, Ganesh Narayanan, Janice Pearson, Patricia O'Brien-Gilbert
  • Publication number: 20100253275
    Abstract: The present invention is a parallel kinematic linkage based micro-positioning system that can provide precise movement at the micron and sub-micron level of a payload that is compatible with an existing automation system. The system has a motor controller, a digital signal processor, a base frame, a first motor, a first cranking arm with a first connecting link and an intermediate stage that mounts a second motor that is attached to a second cranking arm with a second connecting link. There is also an output stage (also called a table) that is precisely moved by the second cranking arm and a first and second optical linear encoder used in combination with the first and second motor and the first and second cranking arm forming a first motor assembly that converts operational data into a plurality of highly precise X-axes and Y-axes payload linear movements.
    Type: Application
    Filed: April 5, 2010
    Publication date: October 7, 2010
    Inventor: Bhargav Ishwarlal Gajjar
  • Patent number: 7804268
    Abstract: An apparatus and method of controlling injection in an electric injection molding machine including a motor and a screw. The apparatus has an encoder detecting a current position of the screw and outputting the detected position as an encoding signal, a memory storing reference positions of the screw according to a drive of the motor by the passage of time, and a current controller checking an elapse of time that the screw moves from a previous position to a current position through receiving the encoding signal from the encoder, reading out a section of time corresponding to the checked elapse of time from the memory, and controlling a current value applied to the motor based on a difference between a reference position of the screw corresponding to the read-out section of time and a current position of the screw.
    Type: Grant
    Filed: November 7, 2007
    Date of Patent: September 28, 2010
    Assignee: LS Mtron Ltd.
    Inventors: Kyong-ho Park, Jong-min Lee
  • Patent number: 7804267
    Abstract: In a correction method for a microprocessor-controlled digital regulation of a drive motor, wherein the measurement arrangement used for the regulation of the motor is simplified. recognizing that the real value surveying cannot always be implemented periodically by the microprocessor at the requested point in time, making sporadic measurement errors of a simplified measurement arrangement ineffectual, in accordance with the method individual measurement values with a sudden change are read out and correction values are used instead of these for the regulation.
    Type: Grant
    Filed: May 15, 2008
    Date of Patent: September 28, 2010
    Assignee: Francotyp-Postalia GmbH
    Inventor: Ralf Müller
  • Patent number: 7791305
    Abstract: The control apparatus 10 of a servo motor of the present invention has a position control unit 11 controlling the position of a servo motor 33, a speed control unit 12 controlling a speed of the servo motor 33, a distributing unit 13 dividing the speed command output by the position control unit 11 into a filtered part Vf which is filtered to suppress vibration and a nonfiltered part Vnf, a filtering unit 14 receiving as input the filtered part Vf and filtering and outputting the filtered part Vf, and an adder unit 15 adding the filtered part Vf filtered by the filtering unit 14 and the nonfiltered part Vnf and outputting the result to the speed control unit 12.
    Type: Grant
    Filed: January 17, 2008
    Date of Patent: September 7, 2010
    Assignee: Fanuc Ltd
    Inventors: Yasusuke Iwashita, Tadashi Okita, Hiroyuki Kawamura
  • Patent number: 7750592
    Abstract: When performing numerical control of a rotary table, the moment of inertia and the center of gravity of a control target change because of a placed object fixed onto the rotary table. A rotary table to which a placed object has been fixed serves as a target plant, the actual motion of this is compared with motion calculated by an identification model of the target plant, and a torque command value is corrected. The identification model comprises a term pertaining to angular acceleration and a term pertaining to angle of rotation, and by including the term pertaining to angle of rotation, correction of a torque command corresponding to a change in the center of gravity can be performed.
    Type: Grant
    Filed: January 3, 2008
    Date of Patent: July 6, 2010
    Assignee: Okuma Corporation
    Inventor: Satoshi Eguchi
  • Patent number: 7723942
    Abstract: An integrated motor and position sensor achieves motion between a moving portion and a stationary portion by electrically energizing poles to interact with magnetics respectively on the moving and stationary portions. The position sensor includes a plurality of sensing coils placed to intercept the magnetic flux between a plurality of the poles and the magnetics. The outputs from these coils are fed to a microprocessor DSP through an internal or external A/D converter. The microprocessor or DSP decodes the measured voltages using resolver strategies to produce a position, velocity or acceleration measurement.
    Type: Grant
    Filed: February 9, 2009
    Date of Patent: May 25, 2010
    Assignees: QuickSilver Controls, Inc.
    Inventor: Donald P. Labriola, II