Linear-movement Motors Patents (Class 318/135)
  • Patent number: 10673314
    Abstract: To select the configuration of a linear motor more appropriately. A motor configuration selection device according to the present invention comprises a characteristic calculation unit that calculates at least one of force and magnetic attraction to be achieved by a component of a linear motor based on a gap between a field magnet and an armature in the linear motor to be selected.
    Type: Grant
    Filed: August 27, 2018
    Date of Patent: June 2, 2020
    Assignee: FANUC CORPORATION
    Inventor: Suguru Takamizawa
  • Patent number: 10647339
    Abstract: Control architecture for use with transport systems, such as linear drive systems, rotary drive systems, or a combination thereof, comprising a computer system having a controller for operating control system software for receiving input commands and protocols for creating a motion profile for each transport element, and a gateway for receiving the motion profile from the control system software and for operating gateway drive software that functions to select the appropriate drives to move each transport element along one or more tracks in accordance with their motion profiles.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: May 12, 2020
    Assignee: Rockwell Automation, Inc.
    Inventors: Glen C. Wernersbach, Keith G. Jacobs
  • Patent number: 10625948
    Abstract: A conveyance system includes a plurality of coils arranged so as to form a row at a predetermined pitch, a carriage configured to move along the row through use of an electromagnetic force received from the plurality of coils as a driving force, a plurality of drivers configured to cause an electric current to flow through coils to be controlled among the plurality of coils to provide the driving force to the carriage, and a controller configured to switch the coils to be controlled, which are assigned to each of the plurality of drivers, among the plurality of coils. As the coils to be controlled, which are assigned to each of the plurality of drivers, among the plurality of coils, coils for each predetermined interval of at least two pitches based on a distance between carriages determined in advance are assigned to each of the plurality of drivers.
    Type: Grant
    Filed: September 18, 2018
    Date of Patent: April 21, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Nobuaki Fujii, Takeshi Yamamoto
  • Patent number: 10608563
    Abstract: The present invention relates to a driving control of a voice coil motor (hereinafter, referred to as ‘VCM’) which moves lens of a camera module, more particularly to a driving control method for VCM capable of reducing the noise generated at the time of initial driving or landing of the lens and reducing the moving time thereof, and the method is characterized by and include the steps of: applying a linearly increasing current with a first slope to the VCM up to a pre-set first inflection point in response to a camera operation-on command; and moving the lens to an infinite position by applying a linearly increasing current with a second slope less steep than the first slope to the VCM from the first inflection point to the infinite position.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: March 31, 2020
    Assignee: DONGWOON ANATECH CO., LTD.
    Inventors: Seung Kwon Lee, Sun Pyo Lee, Ho Jun Lee, Sin Won Cho
  • Patent number: 10585145
    Abstract: Sections of a linear motor track can each include a single power sensor configured to detect a power current in an erroneous state and one or more reference sensors configured to detect reference currents in erroneous states. The power sensor can be arranged between multiple drive coils of a section and a DC power rail (or “mid-bus”) for the drive coils. The power sensor can produce a single isolated output to a processor for the section, and the processor, in turn, can compare the output to a threshold for determining an error. The one or more reference sensors can be arranged between lower switches and a DC-reference bus, thereby providing a DC-referenced sensing signal for the drive coil currents. By referencing the processor to the same rail as the DC-referenced current sensing circuit, the reference sensors can produce outputs to the processor without any need for isolation.
    Type: Grant
    Filed: September 13, 2017
    Date of Patent: March 10, 2020
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Omid Shirazi, Nandini Ganesan, Patrick E. Ozimek
  • Patent number: 10566917
    Abstract: A linear motor control apparatus has: a plurality of coil units; a plurality of position detecting units for detecting positions of a plurality of trucks which move over the plurality of coil units; a plurality of deviation calculating units for operating deviation information as differences between the detected truck positions and a target position of the detected truck; a plurality of position control units for operating current control signals based on the deviation information; a plurality of current control units for supplying driving currents to the coil units based on the current control signals; and a switching unit for switching the position control units to which the deviation information is transmitted or switching the current control units to which the current control signals are transmitted.
    Type: Grant
    Filed: November 8, 2018
    Date of Patent: February 18, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Norihiro Suzuki, Takeshi Yamamoto, Koji Tomoda, Satoru Deguchi, Hidetada Narahara
  • Patent number: 10493670
    Abstract: There is described an apparatus for forming opening devices on a sheet packaging material for packaging pourable food products; the apparatus comprises conveying means for advancing the packaging material along a given path, at least one molding unit arranged along the path and adapted to mold one opening device on a receiving portion of the packaging material, and at least one movable element carrying the molding unit and advanced parallel to at least a portion of the path to allow the molding unit to form the opening device while the packaging material is being advanced along the path.
    Type: Grant
    Filed: November 25, 2014
    Date of Patent: December 3, 2019
    Assignee: TETRA LAVAL HOLDINGS & FINANCE S.A.
    Inventors: Davide Borghi, Paolo Fontanazzi, Fabrizio Rimondi, Stefano Flore
  • Patent number: 10464354
    Abstract: A printer includes a processor; a conveying motor that can operate in any one of a plurality of excitation modes, the conveying motor being configured to convey a printing medium; and a printhead that prints on the printing medium on the basis of printing data, wherein, with respect to each of at least some of the plurality of excitation modes, the processor estimates a strength value of a vibration that would be caused by said conveying motor when the conveying motor is operated in said excitation mode at a first conveying speed that is set based on the print data, and selects one of the plurality of excitation modes for actually operating the conveying motor based on the estimated strength values of the vibrations for the at least some of the plurality of excitation modes.
    Type: Grant
    Filed: March 13, 2018
    Date of Patent: November 5, 2019
    Assignee: CASIO COMPUTER CO., LTD.
    Inventor: Takeo Ozawa
  • Patent number: 10457497
    Abstract: A conveyor system for conveying electrically conductive articles such as aluminum cans. The conveyor system comprises a plurality of coils below the top surface of an electromagnetic conveyor at a junction between an infeed conveyor and a discharge conveyor. The coils propagate electromagnetic flux waves that induce currents in the electrically conductive articles that force the articles to follow a conveying path from the infeed to the discharge conveyor. Dead spots on the electromagnetic conveyor can be eliminated by adjusting the coil drive waveforms.
    Type: Grant
    Filed: April 13, 2018
    Date of Patent: October 29, 2019
    Assignee: Laitram, L.L.C.
    Inventors: Aditya Mehendale, Ewout Peter van der Laan, Funda Sahin-Nomaler, Pieter Aarnout Klop
  • Patent number: 10372105
    Abstract: A drive device for providing a drive movement, including a drive motor designed to convert provided electric or fluidic energy into a movement of a motor element, further including a drive sensor assigned to the drive motor and designed to detect the movement of the motor element and to provide a drive sensor signal, and further including a transmission device coupled to the drive motor and designed to convert the movement of the motor element into a drive movement of a drive element, wherein the transmission device is assigned a movement sensor for the detection of the drive movement, the movement sensor being electrically connected to the drive sensor The movement sensor is assigned a detection device designed for the detection of component data and for the provision of detected component data to the movement sensor.
    Type: Grant
    Filed: December 11, 2014
    Date of Patent: August 6, 2019
    Assignee: FESTO AG & Co. KG
    Inventors: Thomas Stauss, Martin Fuss, Michael Schottner
  • Patent number: 10326398
    Abstract: A linear motor actuator includes a plurality of stators mounted stationary relative to one another along a common actuation axis. A translator rod is mounted to the stators for linear motion relative to the stators along the actuation axis, wherein each stator is magnetically coupled to the translator rod to drive motion of the translator rod along the actuation axis.
    Type: Grant
    Filed: October 6, 2016
    Date of Patent: June 18, 2019
    Assignee: Hamilton Sundstrand Corporation
    Inventor: Steven A. Avritch
  • Patent number: 10316945
    Abstract: This invention relates to a linear actuator, comprising an electric motor (10), a worm gear (13, 14), a transmission (15, 16, 19), an outer tube (2) and a spindle (12), said spindle (12) being in connection with the transmission (15, 16, 19), a spindle nut (11) on the spindle (12), a thrust bearing (20) for supporting a shaft end (21) of the spindle (12), wherein the connection between the shaft end of the spindle (12) and the transmission (15, 16, 19) allows a mutual axial movement so that axial forces are only lead through the spindle (12) bypassing the transmission (15, 16, 19) and directly to the thrust bearing (20), wherein a support structure (17, 18, 24, 28) fixedly connects the outer tube (2) and a lower bracket (20, 22), wherein said worm gear (13, 14) drives a shaft (19) included in said transmission (15, 16, 19), which shaft (19) has a driving gear wheel (15) fixedly attached thereto, arranged to transmit torque to a driven gear wheel (16) fixedly attached to the spindle (12), wherein said transmis
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: June 11, 2019
    Assignee: REAC AB
    Inventor: Johan Olsson
  • Patent number: 10293398
    Abstract: The underlying invention relates in particular to a forming machine, having an electromagnetic linear motor with a linear mover and multiple coil units each with a predetermined coil pole pitch (S) which is measured in the direction of the movement axis. The linear mover includes, in an alternating arrangement along the longitudinal axis (L) thereof, first permanent magnets which are magnetized transversely to the longitudinal axis with a predetermined first magnetic pitch (T1) and second permanent magnets which are magnetized in the direction of the longitudinal axis (L) with a predetermined second magnetic pitch (T2), wherein a ratio of coil width (S) to first magnetic pitch (T1) is 3:1, and wherein a ratio of first magnetic pitch (T1) to second magnetic pitch (T2) is 2:1.
    Type: Grant
    Filed: September 12, 2016
    Date of Patent: May 21, 2019
    Assignee: Langenstein & Schemann GmbH
    Inventor: Markus Otto
  • Patent number: 10272789
    Abstract: A wireless power supply system is a wireless power supply system provided with a travel lane for wirelessly transmitting power to a moving body and includes a power transmitting coil that is disposed such that the axial direction of the coil is substantially parallel to the width direction of the travel lane, and electromagnetic shielding walls that are disposed on the respective sides of the travel lane in the extension direction of the travel lane.
    Type: Grant
    Filed: May 14, 2015
    Date of Patent: April 30, 2019
    Assignee: TDK CORPORATION
    Inventors: Noritaka Chiyo, Yasuhiro Terasaki, Mitsunari Suzuki
  • Patent number: 10248102
    Abstract: A numerical controller for controlling a machine tool including a spindle motor formed of an induction motor includes: a storage unit that stores a maximum acceleration at which the spindle motor can operate when a magnetic flux amount of the spindle motor reaches its maximum; a magnetic flux amount acquisition unit that acquires a present magnetic flux amount of the spindle motor; and an acceleration change unit that changes an acceleration of a position command based on a maximum acceleration of the spindle motor stored in the storage unit according to a magnetic flux amount at the start of movement of the spindle motor acquired by the magnetic flux amount acquisition unit when the spindle motor is operated by position control using a position command.
    Type: Grant
    Filed: February 13, 2018
    Date of Patent: April 2, 2019
    Assignee: FANUC CORPORATION
    Inventors: Kouki Oikawa, Yuuki Morita, Tadashi Okita
  • Patent number: 10247173
    Abstract: An actuator according to one embodiment of the present invention may include a fixed member and a free member. The free member is operatively engaged with the fixed member so that the free member is moveable with respect to the fixed member. The actuator also includes means for moving the free member with respect to the fixed member. An elastic element operatively associated with the free member and the fixed member is operable to store energy without a change in an overall length of the actuator.
    Type: Grant
    Filed: November 18, 2015
    Date of Patent: April 2, 2019
    Assignee: ARIZONA BOARD OF REGENTS, ACTING FOR AND ON BEHALF OF, NORTHERN ARIZONA UNIVERSITY
    Inventors: Kiisa Nishikawa, Theodore A. Uyeno
  • Patent number: 10243502
    Abstract: A system for monitoring a motor includes a movable component having a plurality of permanent magnets. The system also includes a plurality of stators having phase windings and surrounding the movable component. The system also includes a plurality of current sensors each configured to detect a detected current flowing to a corresponding stator of the plurality of stators. The system also includes a monitor configured to receive the detected current, perform a comparison of the detected current from each of the plurality of stators, and to identify a loss of redundancy of the motor based on the comparison.
    Type: Grant
    Filed: February 22, 2018
    Date of Patent: March 26, 2019
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Steven A. Avritch, David F. Dickie
  • Patent number: 10164555
    Abstract: A half-bridge inverter comprised of upper and lower switches can be placed in linear motor track sections to alternately connect a common point of all drive coils to a full-bus DC power rail (“full-bus”) and a DC reference, according to PWM command signals, functioning as a “virtual mid-bus” to allow bi-directional flow of a sum of currents of all drive coils in the section. Separate upper and lower drive switches of the half-bridge inverters that are also connected to drive the drive coils can then be controlled, according to separate PWM command signals, to synchronize their PWM cycles and duty cycle commands with respect to the virtual mid-bus at times when a mover is not present, resulting in zero voltage across the drive coils, or command different duty cycles with respect to the virtual mid-bus when a mover is present, resulting in a desired voltage across the drive coils. The desired voltage can produce a current in the drive coils to electromagnetically propel the mover.
    Type: Grant
    Filed: February 14, 2018
    Date of Patent: December 25, 2018
    Assignee: Rockwel Automation Technologies, Inc.
    Inventor: Patrick E. Ozimek
  • Patent number: 10154829
    Abstract: An ultrasound system includes a display, an actuator, a user interface, and a processing circuit. The actuator is configured to control at least one of a position or an orientation of the display. The user interface is configured to receive a user input. The processing circuit is configured to cause the actuator to adjust the at least one of the position or orientation of the display based on the user input.
    Type: Grant
    Filed: February 22, 2017
    Date of Patent: December 18, 2018
    Assignee: EDAN INSTRUMENTS, INC.
    Inventors: Richard Henderson, Sean Murphy
  • Patent number: 10148945
    Abstract: A method for dynamically calibrating an image capture device comprises: a) determining a distance (DCRT, DEST) to an object within a scene; b) determining a first lens actuator setting (DACINIT) for the determined distance; c) determining a second lens actuator setting (DACFOCUS) providing maximum sharpness for the object in a captured image of the scene; and d) storing the determined distance (DCRT, DEST) and the first and second lens actuator settings. These steps are repeated at a second determined distance separated from the first determined distance. A calibration correction (ERRNEARPLP, ERRFARPLP) for stored calibrated lens actuator settings (DACNEARPLP, DACFARPLP) is determined as a function of at least: respective differences between the second lens actuator setting (DACFOCUS) and the first lens actuator setting (DACINIT) for each of the first and second determined distances; and the stored calibrated lens actuator settings are adjusted according to the determined calibration corrections.
    Type: Grant
    Filed: May 25, 2017
    Date of Patent: December 4, 2018
    Assignee: FotoNation Limited
    Inventors: Alexandru Malaescu, Florin Nanu
  • Patent number: 10103672
    Abstract: A stator segment for a linear motor-based transport system is developed to the effect that a transmitter for cyclic transmission of a control data record in a first clock cycle also transmits, in addition to transmitting the control data record, a position value in a clock-synchronized manner, wherein a plurality of positions are available as a sequence with a quantity of elements and an element with an index corresponds to a position, where the transmitter unit is configured such that, upon every first clock cycle, the index is incremented commencing from a starting value and an element is transmitted after the control data record, where the transmitter unit is furthermore configured to transmit all elements in one transmission interval, and where the transmission interval corresponds to a multiple of the first clock cycle.
    Type: Grant
    Filed: April 17, 2017
    Date of Patent: October 16, 2018
    Assignees: Siemens Aktiengesellschaft, Festo AG & Co. KG
    Inventors: Fabian Albert, Marco Gierden, Ralf Hartramph, Michael Jaentsch, Sven Rothe, Carsten Spindler, Andreas Veit
  • Patent number: 10056816
    Abstract: Aspects of the invention provide methods and systems for moving a plurality of movable stages relative to a stator. The stator comprises a plurality of coils shaped to provide pluralities of coil trace groups where each coil trace group comprises a corresponding plurality of generally linearly elongated coil traces which extend across a stator tile. Each movable stage comprises a plurality of magnet arrays. Methods and apparatus are provided for moving the movable stages relative to the stator, where a magnet array from a first movable stage and a magnet array from a second movable stage both overlap a shared group of coil traces. For at least a portion of the time that the magnet arrays from the first and second movable stages overlap the shared group of coil traces, currents are controllably driven in the shared coil trace group based on the positions of both the first and second movable stages. The positions of the first and second movable stages may be ascertained by feedback.
    Type: Grant
    Filed: December 6, 2016
    Date of Patent: August 21, 2018
    Inventor: Xiaodong Lu
  • Patent number: 9862213
    Abstract: An inkjet printing apparatus includes an inkjet print head arranged to be moveable in a direction of movement along a guiding assembly. The guiding assembly includes a support structure; a strip mounted on the support structure, the strip being rigidly straight in a first direction substantially perpendicular to the direction of movement and mounted in such way that a straightness in the direction of movement is provided; and an air bearing system operatively coupled to the strip. The strip extends in a vertical plane, the vertical plane being substantially parallel to the direction of movement and being substantially parallel to the first direction. The air bearing system is configured to control a position of the inkjet print head in a horizontal plane relative to the strip during movement of the print head in the direction of movement, the horizontal plane being substantially perpendicular to the vertical plane.
    Type: Grant
    Filed: May 25, 2016
    Date of Patent: January 9, 2018
    Assignee: OCE-TECHNOLOGIES B.V.
    Inventors: Brandon Rigio, Brian D. Otter, Michael P. Hoy
  • Patent number: 9766054
    Abstract: A planar motor rotor displacement measuring device and its measuring method are provided. The motor is a moving-coil type planar motor. The device comprises probes, two sets of sine sensors, two sets of cosine sensors, a signal lead wire and a signal processing circuit. The method is arranging two sets of magnetic flux density sensors within a magnetic field pitch ? along two vertical movement directions in the rotor located in the sine magnetic field area. Sampled signals of the four sets of sensors are respectively processed with a frequency multiplication operation, four subdivision signals are obtained, the zero-crossing points of the four subdivision signals are detected, and then two sets of orthogonal pulse signals are generated. The pulse number of the orthogonal pulse signals is counted, and phase difference of the two sets of orthogonal pulse signals is respectively detected.
    Type: Grant
    Filed: February 8, 2013
    Date of Patent: September 19, 2017
    Assignees: SHANGHAI MICRO ELECTRONICS EQUIPMENT CO., LTD., TSINGHUA UNIVERSITY
    Inventors: Jinchun Hu, Yu Zhu, Wensheng Yin, Longmin Chen, Kaiming Yang, Ming Zhang, Dengfeng Xu, Haihua Mu, Chuxiong Hu, Zhao Liu
  • Patent number: 9755468
    Abstract: Systems and methods for generating currents in a plurality of CTS that may be independently controlled by a microprocessor. In some cases, a DC power source (such as a battery) is connected to each inverter. In other cases, a rechargeable DC power source (such as a capacitor) is connected to each inverter. Multiple controllable, turn-less structures may be provided in a suitable configuration with a single, main control processor or alternatively, with both a main control processor and several intermediate level command modules, each intermediate level command module coupled to a respective one of the inverters to control currents through each conductor of the respective inverter.
    Type: Grant
    Filed: February 18, 2016
    Date of Patent: September 5, 2017
    Inventor: Oved Zucker
  • Patent number: 9683643
    Abstract: A linear actuator assembly (30) having an inner sleeve (100) which moves in a first direction or in an opposite second direction relative to a fixed outer sleeve (90) between a fully extended position and a fully retracted position. The linear actuator assembly (30) also has an emitter (180) and a sensor (184) positioned near the emitter (180) that detect changes in an emitted signal resulting from the movement of the inner sleeve (100) relative to the outer sleeve (90) along a longitudinal axis and a controller (101) electrically coupled to the sensor (184) to determine the axial position of the inner sleeve (100) relative to the outer sleeve (90) along the longitudinal axis.
    Type: Grant
    Filed: November 21, 2012
    Date of Patent: June 20, 2017
    Assignee: KONGSBERG AUTOMOTIVE AB
    Inventors: Bengt Cyrén, Bengt Hermansson
  • Patent number: 9673021
    Abstract: An object of the invention is to provide a positioning apparatus and a positioning control device that may perform precise positioning by suppressing relative displacement of a movable point and positioning target objects. In a positioning apparatus including a movable stage, a stage position detector that detects a position of the movable stage, a control device that performs positioning of the movable stage, a positioning target object for positioning of the movable stage, and at least one or more sensors in a structure of the positioning target object or the movable stage, the control device includes an amount of relative displacement estimation unit that estimates an amount of relative displacement of the movable stage and the positioning target object using information of the sensor and information of the stage position detector, and a unit that controls the position of the stage using information calculated by the amount of relative displacement estimation unit.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: June 6, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Hironori Ogawa, Tomohiro Inoue, Masaki Odai
  • Patent number: 9606072
    Abstract: In an X-ray inspecting apparatus, a rotational fluctuation amount of a stage is calculated around a power transmission part of the stage and a stage drive unit as a base point, i.e., the X-axis and Y-axis sliding parts, in accordance with detected positional information from a position detecting sensor. Then, a stage shift amount is calculated in accordance with the rotational fluctuation amount and a distance between the base point and an imaging position on the stage. Here, the stage shift amount corresponds to a positional deviation of the stage at the imaging position caused by an attitude variation of the stage in a yawing direction, and thus is an error in repeated positioning. Accordingly, a tomographic image with high resolution can be generated in consideration of the error in repeated positioning.
    Type: Grant
    Filed: June 9, 2015
    Date of Patent: March 28, 2017
    Assignee: SHIMADZU CORPORATION
    Inventors: Yusuke Tagawa, Hiroshi Oohara, Yoshihiro Ueno
  • Patent number: 9577563
    Abstract: In a method for activating an electric machine having a rotor, a stator winding having multiple phases and a rectifier having multiple half-bridges corresponding to the number of phases, which each have active switching elements, alternating current signals, which are phase-offset to one another by switching the switching elements, are applied to the phases in a first motor operating mode in which the rotor rotates above a limiting speed, and in a second motor operating mode, in which the rotor rotates below the limiting speed, constant direct-current signals are at least partially applied to the phases by switching the switching elements as a function of an instantaneous angle position of the rotor, the direct-current signals being selected in such a way that a current flow does not exceed a predefined maximum current absolute value through any of the phases.
    Type: Grant
    Filed: November 17, 2014
    Date of Patent: February 21, 2017
    Assignee: ROBERT BOSCH GMBH
    Inventor: Julian Roesner
  • Patent number: 9568819
    Abstract: A holding apparatus of the present invention for holding a mold, includes a chuck configured to attract the mold to hold the mold, including a plurality of holding units each of which is configured to hold the attracted mold, and including a support configured to support the plurality of holding units; and an actuator supported by the support and deforms the mold by applying a force. At least one of the holding units is supported by the support unit so as to be displaceable in the direction of the force applied by the actuator.
    Type: Grant
    Filed: January 30, 2012
    Date of Patent: February 14, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Hirotoshi Torii
  • Patent number: 9554434
    Abstract: A light-emitting diode driver includes a power switch, a logic unit and a pulse adjustment signal generator. The power switch is used to control a charging level of a light-emitting diode voltage terminal, and controlled to be turned on or off by a pulse-width modulation signal. The logic unit is coupled to a control terminal of the power switch, and used to generate a frequency control signal. The pulse adjustment signal generator is coupled to the logic unit, and used to generate an operational wave according to the frequency control signal and update the pulse-width modulation signal according to the operational wave. When the duty cycle of the pulse-width modulation signal is smaller than a pulse-width modulation threshold, the operational wave has a first frequency. When the duty cycle of the pulse-width modulation signal is larger than the pulse-width modulation threshold, the operational wave has a second frequency higher than the first frequency.
    Type: Grant
    Filed: October 5, 2015
    Date of Patent: January 24, 2017
    Assignee: AU OPTRONICS CORP.
    Inventors: Kuan-Cheng Chen, Yung-Hsu Lin
  • Patent number: 9525319
    Abstract: An actuator includes a first stator with four first poles and a second stator with four second poles aligned with the four first poles. A permanent magnet is attached to the first stator and the second stator. Four moving armatures are positioned at terminal ends of the four first poles and the four second poles. Coils are wrapped around the first stator and the second stator. A controller selectively applies current to the coils to migrate flux created by the permanent magnet through selective poles of the first stator and the second stator and thereby alter the size of air gaps associated with the four moving armatures.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: December 20, 2016
    Assignee: QM Power, Inc.
    Inventor: Charles J. Flynn
  • Patent number: 9465305
    Abstract: A method for determining a commutation offset for a mover (250A) of a mover assembly (220C) that moves and positions a stage (220A) relative to a stage base (220B) includes controlling the mover assembly (220C) in a closed loop fashion to maintain the position of the stage (220A) along a first axis and along a second axis with the stage (220A) levitated above the stage base (220B). The method also includes the steps of (i) directing current to a coil array (240) of the mover assembly (220C) so that the mover assembly (220C) imparts a disturbance on the stage (220A); and (ii) evaluating one or more forces generated by the mover assembly (220C) as a result of the disturbance on the stage (220A) created by the mover (250A). Further, a method for generating a compensation map (1402) includes sequentially directing a plurality of excitation signals to the control of the mover assembly (220C) and determining the control commands that result from the plurality of excitation signals.
    Type: Grant
    Filed: May 5, 2011
    Date of Patent: October 11, 2016
    Assignee: NIKON CORPORATION
    Inventors: Pai-Hsueh Yang, Scott Coakley, Michael B. Binnard, Kazuhiro Hirano, Bausan Yuan, Shiang-Lung Koo
  • Patent number: 9397538
    Abstract: A linear motor with enhanced cooling performance, including: a stator including multiple magnetic force generating members provided in a row; a moving element including multiple coils provided in a row in an axis line direction of the stator and wound around an outside of the stator; and a heat transfer member dissipating heat generated by the coil which is between adjacent coils and along a side of the coils.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: July 19, 2016
    Assignee: FUJI MACHINE MFG. CO., LTD.
    Inventors: Jun-ichi Narita, Ryo Nagata, Masaki Kurono
  • Patent number: 9325232
    Abstract: Embodiments of an electrical power generation device and methods of generating power are disclosed. One such method comprises creating magnetic flux forces generally transverse to a face of a magnet facing a center of a cylinder, moving a coil of wound conductive material partially through the center opening of the cylinder to produce the electric current and, routing resistive forces generated from the moving coil through an iron core, wherein the first coil is positioned concentrically about a first portion of the core, and further routing the resistive forces around the cylinder.
    Type: Grant
    Filed: July 18, 2011
    Date of Patent: April 26, 2016
    Assignee: Linear Labs, Inc.
    Inventor: Fred E. Hunstable
  • Patent number: 9310782
    Abstract: A method for measuring the displacement of a planar motor rotor. The measuring method comprises: four magnetic induction intensity sensors are distributed on the planar motor rotor; sampled signals of the four distributed sensors are processed to obtain signals Bsx, Bcx, Bsy and Bcy and magnetic field reference values Bksx, Bkcx, Bksy and Bkcy; and X-direction displacement and Y-direction displacement can be measured respectively according to inequalities (I) and (II) by judgments, wherein ?x and ?y are X-direction displacement resolution and Y-direction displacement resolution respectively, and BM is the magnetic induction intensity amplitude of the magnetic field of said planar motor. The method provided by the invention is simple in calculation, can avoid calculation of a transcendental function and solve the quadrant judgment problem, is favorable to real-time high-speed operation and has a high engineering value.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: April 12, 2016
    Assignees: SHANGHAI MICRO ELECTRONICS EQUIPMENT CO., LTD., TSINGHUA UNIVERSITY
    Inventors: Yu Zhu, Jinchun Hu, Dengfeng Xu, Yuting Sun, Wensheng Yin, Ming Zhang, Kaiming Yang, Haihua Mu
  • Patent number: 9270156
    Abstract: A linear motor includes a stator and an armature that faces the stator with a gap therebetween. The stator has an elongated shape extending so as to cross a direction in which the stator faces the armature, and includes a plurality of salient poles that are arranged along a longitudinal direction of the stator and protrude toward the armature. The armature includes an armature core including a tooth that protrudes toward the stator, an armature winding wound around the tooth, a plurality of permanent magnets disposed on an end side of the tooth so as to be arranged along the longitudinal direction of the stator, and a magnetic-field sensor that detects a magnetic field which is generated by the plurality of permanent magnets and which passes through the plurality of salient poles.
    Type: Grant
    Filed: June 23, 2014
    Date of Patent: February 23, 2016
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Shogo Makino, Motomichi Ohto, Yuji Arinaga
  • Patent number: 9194386
    Abstract: A linear compressor is provided that provides a greater power by changing a frequency at high load. The linear compressor includes a mechanical device having a fixed member, a movable member linearly reciprocated in the fixed member, one or more springs provided to elastically support the movable member, and a motor connected to the movable member, and an electric controller having a rectifier, an inverter that receives a DC voltage from the rectifier, converts the DC voltage to an AC voltage, and supplies the AC voltage to the motor, a voltage sensor that senses the DC voltage, a current sensor that senses a current, and a controller that calculates a required voltage for the motor, generates a control signal, and applies the control signal to the inverter, if the required voltage is greater than the DC voltage of the voltage sensor.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: November 24, 2015
    Assignee: LG ELECTRONICS INC.
    Inventors: Jin Seok Hu, Shin Hyun Park, Yong Tae Kim, Hoon Bong Lee, Kye Lyong Kang
  • Patent number: 9184684
    Abstract: A motor driving circuit for driving a motor includes: a driving-stage circuit, for converting an input voltage into a first output voltage and a second output voltage, and comprising a first transistor, a second transistor, a third transistor and a fourth transistor; an output stage circuit, for converting the first output voltage or the second output voltage into a motor speed signal; and a control unit, coupled to the first, the second, the third and the fourth transistors and the output stage circuit, for generating first, second, third and fourth transistor control signals to control the first, the second, the third and the fourth transistors respectively.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: November 10, 2015
    Assignee: Anpec Electronics Corporation
    Inventors: Ming-Jung Tsai, Kun-Min Chen, Ching-Sheng Li
  • Patent number: 9151217
    Abstract: An engine system comprises a first turbocharger including a first wastegate, first wastegate actuator, and first turbocharger sensor, a second turbocharger including a second wastegate, second wastegate actuator, and second turbocharger sensor, and a controller configured to adjust the first wastegate actuator so that a parameter of the first turbocharger matches a parameter of the second turbocharger, based on output from the first and second turbocharger sensors. In this way, turbocharger output between the two turbochargers may be balanced.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: October 6, 2015
    Assignee: Ford Global Technologies, LLC
    Inventors: James Alfred Hilditch, Julia Helen Buckland, Robert Andrew Wade
  • Patent number: 9136749
    Abstract: An electrical power system for generating electrical power in a building is provided. The building has an elevator with the elevator having at least one elevator car and the at least one elevator car within an elevator shaft. The electrical power system comprises at least one magnet counterweight connected to the at least one elevator car and at least one coil mounted within the elevator shaft. The at least one magnet counterweight moves in a downward direction as the at least one elevator car moves in an upward direction and the at least one magnet counterweight moves in an upward direction as the at least one elevator car moves in a downward direction. The magnet counterweight passes through the at least one coil thereby generating electrical current.
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: September 15, 2015
    Inventor: John M. Callier
  • Patent number: 9130425
    Abstract: A pole piece structure is provided to be used as part of an active rotor structure for an electrical rotary machine, wherein the active rotor structure is circular comprising pole pieces and permanent magnets magnetized in the circumferential direction of the rotor structure, wherein the rotor pole piece structure is a single structure with at least two individually spaced pole pieces connected by an integration bridge. Further provided is a method of manufacturing a rotor pole piece structure and a rotor for an electrical machine with a rotor pole piece structure. The assembly of magnets to the pole pieces is significantly enhanced using these rotor pole piece structures as described.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: September 8, 2015
    Assignee: HOGANAS AB (PUBL)
    Inventors: Göran Nord, Lars-Olov Pennander, Alan G. Jack
  • Patent number: 9093930
    Abstract: An embodiment linear actuator for an electrically adjustable piece of furniture includes a brushless DC motor arranged to effect a linear movement of the linear actuator, as well as a control device for controlling the motor.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: July 28, 2015
    Assignee: LOGICDATA Electronic & Software Entwicklungs GMBH
    Inventors: Walter Koch, Siegfried Silber, Herbert Grabner, Peter Hutterer
  • Patent number: 9065380
    Abstract: A method for calculating a motor constant of a permanent magnet type synchronous motor according to the present invention includes: a voltage applying step of applying a voltage obtained by compositing a DC component and an AC component to a permanent magnet type synchronous motor while varying a frequency of the AC component; a current detecting step of detecting a motor current flowing according to the applied voltage; a phase difference calculating step of calculating a difference in phase between the AC component of the applied voltage and an AC component of the motor current; and a motor constant calculating step of calculating a motor constant of the permanent magnet type synchronous motor. In addition, in the motor constant calculating step, the motor constant is calculated based on the applied voltage and the motor current when the difference in phase becomes nearly 45 degrees.
    Type: Grant
    Filed: July 30, 2012
    Date of Patent: June 23, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Toru Tazawa, Masaru Nishizono
  • Patent number: 9054627
    Abstract: A method for driving a Linear Resonant Actuator (LRA) is provided. During a first off interval, the back-emf of the LRA is measured. During a first off interval, a timer is started when the back-emf reaches a predetermined threshold, and after a predetermined delay has lapsed following the back-emf reaching the predetermined threshold during the first off interval, the LRA is driven over a drive interval having a length and drive strength. A second off interval is entered following the drive interval, and during the second off interval, the back-emf of the LRA is measured. During the second off interval, the timer is stopped when the back-emf reaches the predetermined threshold. The value from the timer that corresponds to the duration between the back-emf reaching the predetermined threshold during the first off interval and the back-emf reaching the predetermined threshold during the second off interval determines the length.
    Type: Grant
    Filed: April 10, 2012
    Date of Patent: June 9, 2015
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Mayank Garg, David Hernandez-Garduno, Brandon J. Beckham, David J. Baldwin, Brett E. Forejt
  • Patent number: 9049366
    Abstract: The present invention relates to a device and method for driving an under damped voice coil motor (VCM) actuator of a camera lens. In one embodiment, the device for driving an under damped VCM actuator comprises a first generator operable to read a first manufacture data from an image signal processor (ISP) and to generate a half natural period, ½ Td, of the VCM actuator by selecting a value approximate to the first data in a first table of the device, a second generator operable to read a second manufacture data from the ISP and to generate the maximum overshoot, K, of the VCM actuator by selecting a value approximate to the second data in a second table of the device, an input shaping signal generator operable to read an input signal corresponding to a desired camera lens moving distance from the ISP and to generate a shaping signal according to the value of the half natural period and the maximum overshoot.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: June 2, 2015
    Assignee: GIANTEC SEMICONDUCTOR LTD. INC.
    Inventors: Hong Zhang, Qing Yang, Hong Ru Xu, Cheng Zhang
  • Publication number: 20150123576
    Abstract: When a motor drive control device is integrated in a semiconductor integrated circuit having a small chip area, calibration for improving the accuracy of detection of a counter electromotive voltage, which is for detecting the speed of a motor, is enabled. A first multiplier performs multiplication between a drive current detection signal and first gain information in a first register. A subtractor performs subtraction between a drive voltage command signal and a first multiplication result in the first multiplier. A second multiplier performs multiplication between a subtraction result in the subtractor and second gain information in a second register to generate counter electromotive voltage information as information on a second multiplication result. The drive voltage command signal in a control unit is set to a predetermined value to generate a condition which maintains the speed of the motor and a counter electromotive voltage at substantially zero.
    Type: Application
    Filed: January 15, 2015
    Publication date: May 7, 2015
    Inventors: Minoru KUROSAWA, Yuki MATSUYA
  • Patent number: 9024548
    Abstract: In a linear motor used for a driving axis of a large-size machine tool having a very long driving stroke, pole position correction values at a plurality of stroke positions are stored in a memory. A pole position correction value corresponding to an actual stroke position of a slider is calculated based on the stored pole position correction value. A corrected electrical angle offset value derived based on the calculated pole position correction value is used to control the linear motor.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: May 5, 2015
    Assignee: OKUMA Corporation
    Inventors: Fumiki Yamaoka, Yoichi Kawai
  • Patent number: 9024487
    Abstract: Levitation devices and associated systems and methods are disclosed herein. A system configured in accordance with a particular embodiment includes an array of magnetic elements that have differently oriented magnetic fields and an inductive component. The inductive component provides a levitation force by magnetic communication with the magnetic fields of the array of magnetic elements. The inductive component includes an array of inductive elements, with individual inductive elements having a looped circuit that provides the levitation force. The inductive component also includes one or more switch element that controls current flow in one or more of the looped circuits responsive to translational motion between the inductive component and the array of magnetic elements.
    Type: Grant
    Filed: November 20, 2012
    Date of Patent: May 5, 2015
    Assignee: Eagle Eye Research, Inc.
    Inventor: John H. Reif
  • Publication number: 20150115848
    Abstract: An electric linear actuator includes a linear array of poloidal electrical cods. The central openings of each of the coils are coaxially aligned to define a central bore for the linear array. A shaft is received within and is movable along the central bore of the linear array. Magnets are affixed at spaced intervals along the shaft. A power source provides power to each of the coils of the linear array. Position sensors are provided for determining the axial position of the shaft along the central bore. A control processor receives position data from the position sensors and controls the application of power from the power source to each of the coils in the linear array. The control processor selectively activates the electrical coils to cause variable application of force on the shaft through electro-magnet attraction or repulsion.
    Type: Application
    Filed: October 28, 2014
    Publication date: April 30, 2015
    Inventor: Patrick A. McFADDEN