Open-loop Stepping Motor Control Systems Patents (Class 318/696)
  • Patent number: 11070004
    Abstract: A magnetic connector assembly has a female connector with spring-loaded conductive pins slightly protruding inside a recess or cavity in the female connector's body. A corresponding male connector has a protrusion on its body with conductive pins slightly indented into the protrusion's surface. The protrusion on the male connector is sized and shaped to fit into the cavity in the female connector such that the male connector's pins engage the pins of the female connector, allowing for electrical communication across the connector assembly. Magnets on the male and female connectors secure them in a correct orientation. A unique shape ensures proper alignment of the pins and prevents the connection of incompatible devices.
    Type: Grant
    Filed: February 6, 2020
    Date of Patent: July 20, 2021
    Inventor: Vincent Lee
  • Patent number: 11063537
    Abstract: The present invention concerns a method of controlling a rotational speed of a rotor (3) of a direct current electric motor (1) comprising an inductor circuit (A, B) for rotating the rotor, which is configured to rotate continuously and is equipped with permanent magnets. The method comprises: measuring the rotational speed of the rotor; determining a time drift in the rotor rotation compared to a reference signal; defining N speed thresholds with at least one being a variable speed threshold depending on the determined time drift, the N speed thresholds defining N+1 rotational speed ranges for the rotor; determining in which one of the N+1 rotational speed ranges the determined rotational speed of the rotor is; and finally selecting an action relative to the control of the inductor circuit, based on the determined rotational speed range, for controlling the rotational speed of the rotor.
    Type: Grant
    Filed: October 18, 2019
    Date of Patent: July 13, 2021
    Assignee: The Swatch Group Research and Development Ltd
    Inventors: Jean-Jacques Born, Christophe Germiquet, Laurent Nagy
  • Patent number: 11050428
    Abstract: A synchronized I/Q detection circuit is provided. A first subset of input signals and, subsequently, a second subset of input signals are provided by a first multiplexer and received by a first phase detector. Outputs of the first phase detector are receiving, by a first reset and sampling circuit. A second set of input signals are provided by a second multiplexer and received by a second phase detector, from a second multiplexer, while the first multiplexer receives the first and second subsets of input signals. The first subset of input signals has a same phase order as the second set of input signals, and the second subset of input signals has a different phase order than the second set of input signals. Outputs of the second phase detector are received by a second reset and sampling circuit. A comparator outputs a detected phase difference based on the outputs of the first and second reset and sampling circuits.
    Type: Grant
    Filed: September 2, 2020
    Date of Patent: June 29, 2021
    Inventors: Zhiqiang Huang, Chih-Wei Yao, Hiep Pham
  • Patent number: 11016446
    Abstract: A timepiece includes a stepping motor having a rotor and a coil, and a drive circuit that applies a first drive pulse having a stable stationary position at a rotor rotation angle of 90 degrees or less from a reference position and a second drive pulse having the stable stationary position at a rotor rotation angle of 90 degrees or more from the reference position, as a pulse for driving the rotor, to the coil. When a period during which the pulse is not applied to the coil is assumed as a waiting period, the drive circuit generates the waiting period after a first application of the second drive pulse after an application of the pulse to the coil is started and rotates the rotor by one or more turns without passing through the waiting period at at least one predetermined timing after the waiting period.
    Type: Grant
    Filed: January 27, 2020
    Date of Patent: May 25, 2021
    Assignee: SEIKO INSTRUMENTS INC.
    Inventors: Satoshi Sakai, Tetsuya Nobe
  • Patent number: 10944351
    Abstract: A motor drive control device capable of reducing the occurrence of vibration in a simple circuit configuration is provided. The motor drive control device (1) includes a motor drive unit (2) that selectively energizes coils with a plurality of phases (Lu, Lv and Lw) of a motor (20) and a control circuit (4) that outputs a drive control signal (Sd) which is a PWM signal to the motor drive unit (2) and thereby controls driving of the motor (20) while switching energization phases of the coils with the plurality of phases (Lu, Lv and Lw) energized by the motor drive unit (2) in predetermined order. The control circuit (4) executes reduction control to temporarily reduce a duty ratio of the drive control signal (Sd) every time a period of 1/m (m is an integer of 2 or more) of a switching cycle of the energization phases elapses after switching the energization phases.
    Type: Grant
    Filed: June 12, 2018
    Date of Patent: March 9, 2021
    Assignee: MINEBEA MITSUMI INC.
    Inventors: Hiroyuki Kaidu, Yuji Omura, Tomoyuki Suzuki
  • Patent number: 10938335
    Abstract: Examples of the present disclosure relate to a device, method, and medium storing instructions for execution by a processor for estimating motor winding temperature. In an example, a device for estimating motor winding temperature includes a motor shaft and a motor winding. The device may include a current sense resistor to detect the current passing through a common wiring. The device may include a digital to analog converter to convert an input voltage to an analog signal for comparison to the voltage and to generate a differential voltage using the signals received from the current sense resistor and an initial voltage supplied to the motor winding. The device may include a processor to use the differential voltage and a current input value to calculate a resistance of the motor winding from comparison to a temperature conversion curve.
    Type: Grant
    Filed: July 3, 2019
    Date of Patent: March 2, 2021
    Assignee: Panasonic Automotive Systems Company of America, Division of Panasonic Corporation of North America
    Inventor: Gordon Ray Miller
  • Patent number: 10833615
    Abstract: Methods for controlling a voltage present at an electric fan during a startup of the fan are disclosed herein. The fan serves to generate a flow of air for cooling a device. The method includes applying an output voltage of a power supply, which serves to supply voltage to the device, to the fan; and switching on and switching off the output voltage of the power supply applied to the fan by a switch pulse-width-modulated-controlled by a control unit so that the Root Mean Square value of the current flowing through the fan is less than a startup current of the fan.
    Type: Grant
    Filed: November 19, 2018
    Date of Patent: November 10, 2020
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Dirk Hertz, Florian Ringer, Marco Schönenberg
  • Patent number: 10819258
    Abstract: A method and circuit for controlling or starting a U-shape single phase synchronous permanent magnetic motor (U-SPSPM motor) having a rotor and a stator and coupled to a single phase alternating current (AC) power source through a switch, including estimating back electromotive force (back-EMF) of the motor based on an observer model with inputs indicative of the measured signals, and triggering the switch to supply power to the motor based on the estimates of the back-EMF.
    Type: Grant
    Filed: August 21, 2019
    Date of Patent: October 27, 2020
    Assignee: Whirlpool Corporation
    Inventors: Kevin J. Fitzpatrick, Biao He, Qiang Mei, Ying Xiao
  • Patent number: 10812088
    Abstract: A synchronized in-phase/quadrature phase (I/Q) detection circuit and a method of the same are provided. The synchronized I/Q detection circuit includes a first logic circuit; a first filter; a first reset and sampling circuit; a first multiplexer; a second logic circuit; a second filter; a second reset and sampling circuit; a signal generator; and a comparator.
    Type: Grant
    Filed: December 14, 2018
    Date of Patent: October 20, 2020
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Zhiqiang Huang, Chih-Wei Yao, Hiep Pham
  • Patent number: 10673361
    Abstract: Methods of compensating for play and for initializing a position encoder in an actuation system (2) including an actuated system (8) comprising an elastic element, and an actuator (4) with a stepper motor (12) having at least one electrical phase.
    Type: Grant
    Filed: July 18, 2016
    Date of Patent: June 2, 2020
    Assignee: Societe Industrielle De Sonceboz SA
    Inventors: Martin Liniger, Markus Flückiger, Jan Persson
  • Patent number: 10662695
    Abstract: A control unit controls an electric motor based on position data on a window glass, and controls an opening-closing operation of the window glass. The control unit includes a reverse rotation detector which detects a reverse rotation operation of the window glass, a reverse rotation prevention controller which performs reverse rotation prevention processing of the electric motor when a reverse rotation is detected, and a position data correction unit which corrects position data on the window glass in an initial operation after occurrence of a reverse rotation operation. If a pulse signal associated with rotation of the electric motor is not input in an initial operation after the detection of the reverse rotation operation, the position data correction unit determines that the window glass has reached a top dead center position, stops the motor, and corrects the position data with the position data at that time as an origin position.
    Type: Grant
    Filed: May 10, 2017
    Date of Patent: May 26, 2020
    Assignee: MITSUBA CORPORATION
    Inventors: Yuichi Yanagita, Masahiro Fueki, Toshihiro Ejima
  • Patent number: 10658956
    Abstract: A circuit includes a processor that analyzes a pulse width modulated (PWM) signal feedback from a brushless DC motor to determine a transition between a mutual inductance zero crossing condition and a Back Electro Motive Force (BEMF) zero crossing condition of the brushless DC motor. A mutual inductance controller is executed by the processor to commutate the brushless DC motor at startup of the motor when the mutual inductance zero crossing condition is detected by the processor. A BEMF controller is executed by the processor to commutate the brushless DC motor after startup of the motor when the BEMF zero crossing condition is detected by the processor.
    Type: Grant
    Filed: June 28, 2018
    Date of Patent: May 19, 2020
    Assignee: Texas Instruments Incorporated
    Inventors: Yisong Lu, Ruochen Zhang, Wei Zuo
  • Patent number: 10649379
    Abstract: A customer replacement unit monitor (CRUM) unit that can be mounted in an image forming apparatus includes a decoder which receives first clock signals from the image forming apparatus and converts the first clock signals into second clock signals, a memory which stores data related with a consumable unit, and a controller which manages the memory based on data signals transmitted from the image forming apparatus and the second clock signals. The first clock signals are divided into a data section in which the data signals are transmitted and received and an idle section in which the data signals are not transmitted and received. The first clock signals have a first frequency on the data section while having a second frequency on the idle section, and the second clock signals are clock signals maintaining a high value or a low value on the idle section.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: May 12, 2020
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Chang-keun Seo, Jin-boo Kim, Youn-jae Kim
  • Patent number: 10637385
    Abstract: A motor drive device includes a motor drive circuit which drives a stepping motor provided with three coils; a switching element for controlling a path through which a current for driving at least one of the coils flows; and a driving pulse generator which outputs a driving pulse to the switching element. The driving pulse generator outputs the driving pulse to the switching element so that the current for driving at least one of the coils flows through one path.
    Type: Grant
    Filed: January 26, 2018
    Date of Patent: April 28, 2020
    Assignee: CASIO COMPUTER CO., LTD.
    Inventor: Yuta Saito
  • Patent number: 10581353
    Abstract: A motor drive control device includes a PWM circuit configured to generate an excitation current for a motor, a measurement circuit configured to measure a charge duty of the excitation current, an arithmetic circuit configured to obtain a characteristic line from the change of the measured duty and calculate a predetermined division point of an excitation current waveform from the characteristic line, and a setting circuit configured to set a level of the excitation current at the division point.
    Type: Grant
    Filed: March 1, 2018
    Date of Patent: March 3, 2020
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Hideki Kimura
  • Patent number: 10545459
    Abstract: Provided is a drive circuit for a two-coil stepper motor, including: a rotor; a stator including first, second, and third stator magnetic-pole portions; a coil A to be magnetically coupled to the first stator magnetic-pole portion and the third stator magnetic-pole portion; a coil B to be magnetically coupled to the second stator magnetic-pole portion and the third stator magnetic-pole portion; a drive pulse generation circuit configured to output a drive pulse; a detection pulse generation circuit configured to output a detection pulse for detecting counter-electromotive currents generated in the coil A and the coil B; and a rotation detection circuit configured to receive a detection signal generated due to the detection pulse as input to determine whether or not the rotor has rotated.
    Type: Grant
    Filed: September 9, 2016
    Date of Patent: January 28, 2020
    Assignee: Citizen Watch Co., LTD.
    Inventors: Yu Takyoh, Toshiaki Fukushima, Toshinari Maeda, Daisuke Iri, Daisuke Matsuoh
  • Patent number: 10520897
    Abstract: There is provided an analog timepiece including an hour hand, a minute hand, and a second hand which are rotated by a unit step operation of a stepping motor. The analog timepiece includes a rotor that rotates the hour hand, the minute hand, and the second hand, and that has a magnetic polarity, a stator that includes magnetic pole portions disposed around the rotor, coils that excite the magnetic pole portions, and a control unit that controls each unit step of the rotor in accordance with each pulse group by applying a pulse group including a rotary pulse for rotating the rotor and a braking pulse for braking rotation of the rotor, which is applied before the rotary pulse is applied, to the coil.
    Type: Grant
    Filed: January 23, 2017
    Date of Patent: December 31, 2019
    Assignee: SEIKO INSTRUMENTS INC.
    Inventor: Kosuke Yamamoto
  • Patent number: 10520898
    Abstract: A driving processor for driving a motor having a rotor and one or more coils for rotating the rotor is configured to generate a detection pulse for detecting whether or not the rotor has rotated; cause the generated detection pulse to be applied to at least one of the one or more coils; receive a signal indicating a detected value of current flowing in the at least one of the one or more coils after the detection pulse has been outputted to the at least one of the one or more coils; and determine whether or not the rotor has rotated to one or more prescribed positions on the basis of the detected value of current.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: December 31, 2019
    Assignee: CASIO COMPUTER CO., LTD.
    Inventor: Yuta Saito
  • Patent number: 10523145
    Abstract: A motor control circuit (12) capable of performing a high-precision step-out determination under a wide range of conditions. The motor control circuit (12) includes an input voltage measuring unit (125), a temperature measuring unit (128), a back electromotive force measuring unit (126), a determination threshold value setting unit, and a determination unit. The input voltage measuring unit (125) measures an input voltage input to a motor control device (10). The temperature measuring unit (128) measures temperature. The back electromotive force measuring unit (126) measures back electromotive force induced in a coil for which energization is stopped out of the coils of plural phases.
    Type: Grant
    Filed: February 14, 2019
    Date of Patent: December 31, 2019
    Assignee: MINEBEA MITSUMI INC.
    Inventors: Ayaka Shimada, Kazuo Takada, Hidetoshi Hijikata
  • Patent number: 10439532
    Abstract: A driving device for a stepping motor includes a motor driving circuit configured to generate a current waveform representing an electrical angle in synchronization with a mechanical angle of the stepping motor, and excite the stepping motor using the current waveform; a memory configured to store a value of the electrical angle; and a controller configured to: when a power supply to the stepping motor and the motor driving circuit is stopped, store a first value of the electrical angle held by the motor driving circuit in the memory; and when the power supply is resumed, replace a value of the electrical angle of the motor driving circuit with the first value while suppressing a rotational operation of the stepping motor.
    Type: Grant
    Filed: July 12, 2018
    Date of Patent: October 8, 2019
    Assignee: TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Tsutomu Kawamoto
  • Patent number: 10401400
    Abstract: An electricity meter includes a disconnect switch connected to a service transformer, a line-side sense circuit, a load-side sense circuit, and a measurement and control circuit. The disconnect switch is configured to receive a phase voltage and an anti-phase voltage from the service transformer. The line-side sense circuit includes a first sense circuit configured to detect the phase voltage delivered to the electricity meter and a second sense circuit configured to detect the anti-phase voltage delivered to the electricity meter, the first sense circuit and the second sense circuit are each connected to a floating reference node. The load-side sense circuit is configured to detect the existence of a phase load and an anti-phase load at a service entrance.
    Type: Grant
    Filed: July 31, 2017
    Date of Patent: September 3, 2019
    Assignee: Landis+Gyr LLC
    Inventors: Frank J. Boudreau, Jr., Matthew Eric Kraus
  • Patent number: 10248135
    Abstract: A stepper motor is driven according to step driving modes including a full-step driving mode, a half-step driving mode and micro-stepping modes. The stepper motor may also be driven in an acceleration phase. A method of controlling the stepper motor includes controlling the current step driving mode of the motor by a processing unit. During the acceleration phase of the stepper motor and the stepper motor being in driven in a current step driving mode other than the full-step driving mode, the processing unit tests, after each speed increase, if a remaining computing power of the processing unit is sufficient for control of the stepper motor to remain in the current step driving mode, and if not the processing unit, in presence of a first switching condition, switches control of the stepper motor to the driving mode having the closest coarser step.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: April 2, 2019
    Assignee: STMicroelectronics (Grand Ouest) SAS
    Inventors: Emmanuel Langouet, Samuel Rousselin
  • Patent number: 10186118
    Abstract: A gaming machine of the present invention stores a bet area on which a bet is placed through a gaming terminal and a game value placed as the bet, determines a resulting symbol from a plurality of symbols, rotates the wheel based on an operation of the lever in one of the plurality of gaming terminals, whose lever has been activated, stops the rotation of the wheel so that the pointer points at a symbol arrangement area with the resulting symbol, and awards a payout based on the resulting symbol and the odds set for the bet area in which the bet is placed through the gaming terminal.
    Type: Grant
    Filed: July 15, 2016
    Date of Patent: January 22, 2019
    Assignees: Universal Entertainment Corporation, Aruze Gaming America, Inc.
    Inventors: Katsuhiro Kido, Hiroki Munakata
  • Patent number: 10171701
    Abstract: An image scanning apparatus includes an image capturing unit, a pulse driving unit and a control unit. The image capturing unit captures an image of an object. The pulse driving unit drives the image capturing unit and the object along a scanning direction to move with respect to each other among multiple pulse nodes, so as to scan the object. The control unit is electrically connected to the pulse driving unit and the image capturing unit, and the control unit controls the image capturing unit to capture multiple images of the object between adjacent pulse nodes, so as to synthesize a scanned image corresponding to the object.
    Type: Grant
    Filed: April 13, 2017
    Date of Patent: January 1, 2019
    Assignee: MICROTEK INTERNATIONAL INC.
    Inventor: Chin-Lai Wu
  • Patent number: 10163280
    Abstract: An example method includes receiving, at a computing system, parameters from a vehicle, wherein the parameters correspond to a set of associated parameter identifiers (PIDs), and determining, by the computing system, one or more thresholds for one or more PIDs of the set of associated PIDs. The example method additionally includes determining, by the computing system, one or more indicators displayable on a first graph of parameters corresponding to a first PID of the set of associated PIDs. For instance, at least one indicator of the one or more indicators represents a parameter corresponding to a second PID of the set of associated PIDs breaching a threshold associated with the second PID. The example method further includes displaying, by the computing system on a graphical user interface, the first graph of parameters corresponding to the first PID and the one or more indicators on the first graph.
    Type: Grant
    Filed: August 10, 2017
    Date of Patent: December 25, 2018
    Assignee: Snap-on Incorporated
    Inventor: Joshua C. Covington
  • Patent number: 10121298
    Abstract: An unlocking method and device utilizing the same are provided. The unlocking method is disclosed, including: in response to an input pre-unlocking operation, performing a timing operation; detecting at least one input unlocking operation; determining whether a time interval from the timing operation to the input unlocking operation is equal to a predefined interval, and if the time interval from the timing operation to the input unlocking operation is equal to the predefined interval, unlocking the device, otherwise, not unlocking the device.
    Type: Grant
    Filed: November 3, 2015
    Date of Patent: November 6, 2018
    Assignee: MEDIATEK SINGAPORE PTE. LTD.
    Inventor: Zhan-yong Wang
  • Patent number: 9989398
    Abstract: A device for determining a predetermined fill level of a liquid in a container, with a sensor unit, comprising a unit capable of oscillating mechanically, a transmitter unit, and a receiver unit, which is electrically and mechanically coupled to the transmitter unit, and which transduces the oscillation of the unit capable of oscillating into an electrical receiving signal. An electronic unit, comprising a regulating unit, which regulates a phase difference that exists between the electrical transmission signal and electrical receiving signal to a determined value at which the unit capable of oscillating conducts oscillations at a resonant frequency, and which forms an oscillation circuit with the transmitter unit, receiving unit and the unit capable of oscillating.
    Type: Grant
    Filed: July 11, 2011
    Date of Patent: June 5, 2018
    Assignee: ENDRESS + HAUSER GMBH + CO. KG
    Inventors: Sascha D'Angelico, Sergej Lopatin, Franco Ferraro
  • Patent number: 9970434
    Abstract: According to an embodiment of the invention, a system for managing commands for a pump electric motor for powering a pump for use in a pool and/or a spa is provided. The system includes a user interface for receiving user commands from a user and a pump motor controller for controlling the pump electric motor. The user interface and/or the pump motor controller is adapted to receive first protocol commands utilizing a first protocol from a first input source and adapted to send first input source signals corresponding to the first protocol commands to a portion of the pump motor controller. The user interface and/or the pump motor controller is further adapted to receive second protocol commands utilizing a second protocol from a second input source and adapted to send second input source signals corresponding to the second protocol commands to a portion of the pump motor controller.
    Type: Grant
    Filed: May 17, 2015
    Date of Patent: May 15, 2018
    Assignee: Regal Beloit America, Inc.
    Inventors: Marc Christopher McKinzie, John Sheldon Wagley
  • Patent number: 9968158
    Abstract: A system assesses activity and displays a unitless activity value. A detector senses activity of a user. A processor reads sensed activity data from the detector. A display displays the unitless activity value. An enclosure houses the detector and the processor. The processor periodically reads the sensed activity data from the detector and processes the data to generate an activity number, the number being used to generate the unitless activity value based upon a maximum number and a display range.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: May 15, 2018
    Assignee: APPLE INC.
    Inventors: Curtis A. Vock, Perry Youngs
  • Patent number: 9923433
    Abstract: Systems are described for converting the angular position of a shaft or an axle of a rotary motor to an analog or a digital code indicative of the angular position. The systems may include a magnetic disk encoded with first magnetic transitions and second magnetic transitions, where the first magnetic transitions are on a first circumference of the magnetic disk, the second magnetic transitions are on a second circumference of the magnetic disk, the first magnetic transitions represent regions on the magnetic disk, and the second magnetic transitions represent locations on the magnetic disk within each of the regions. The systems may include a first sensor to detect a region based on the first magnetic transitions and a second sensor to detect a location based on the second magnetic transitions. The systems may also include a decoder to identify an absolute location on the magnetic disk based on the region detected by the first sensor and the location detected by the second sensor.
    Type: Grant
    Filed: August 10, 2015
    Date of Patent: March 20, 2018
    Inventors: Antonio Sangermano, II, Richard O'Day
  • Patent number: 9909809
    Abstract: The heat treatment apparatus includes: a processing chamber which accommodates a processing object; a heating unit which heats the processing object accommodated in the processing chamber; a temperature detecting unit which detects an internal temperature of the processing chamber; and a controller which sets a second setting temperature identical to as a temperature detected by the temperature detecting unit when the temperature detected by the temperature detecting unit falls below a predetermined first setting temperature due to an external disturbance; controls the heating unit so that a third setting temperature between the second setting temperature and the first setting temperature becomes identical to the temperature detected by the temperature detecting unit; and controls the heating unit so that the first setting temperature becomes identical to the temperature detected by the temperature detecting unit after the third setting temperature becomes identical to the temperature detected by the temperat
    Type: Grant
    Filed: January 16, 2013
    Date of Patent: March 6, 2018
    Assignee: TOKYO ELECTRON LIMITED
    Inventors: Goro Takahashi, Takanori Saito, Wenling Wang, Koji Yoshii, Tatsuya Yamaguchi
  • Patent number: 9871485
    Abstract: The stepper motor driver circuit controls driving of a stepper motor. The stepper motor driver circuit generates a driving current having a pseudo-sinusoidal waveform that varies stepwise every one period of a reference clock signal and makes the waveform of the driving current vary in response to a measurement value of an exciting voltage on a coil of the stepper motor at a time when the driving current is zero.
    Type: Grant
    Filed: May 16, 2016
    Date of Patent: January 16, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hideki Kimura, Katsunori Sasaki
  • Patent number: 9785117
    Abstract: A motor drive device includes a driver unit configured to be connected to a stepping motor, and a controller connected to the driver unit. The controller causes the driver unit to output a drive pulse to the stepping motor for causing the stepping motor to rotate stepwise in a prescribed rotation direction. The controller detects, through the driver unit, a current induced by a counter-electromotive force generated in the stepping motor in response to the drive pulse. The controller causes the driver unit to apply a counter pulse having the same electrical polarity as the drive pulse to the stepping motor so as to suppress an amount of the current induced by the counter-electromotive force when the stepping motor is not rotating in response to the drive pulse so that the amount of the induced current detectably differs between when the stepping motor is rotating and not rotating.
    Type: Grant
    Filed: July 20, 2016
    Date of Patent: October 10, 2017
    Assignee: CASIO COMPUTER CO., LTD.
    Inventors: Yohei Kawaguchi, Fumiaki Ochiai, Yuta Saito
  • Patent number: 9681065
    Abstract: A gimbal system, including components and methods of use, configured to track moving targets. More specifically, the disclosed system may be configured to orient and maintain the line of sight (“los”) of the gimbal system toward a target, as the target and, in some cases, the platform supporting the gimbal system are moving. The system also may be configured to calculate an estimated target velocity based on user input, and to compute subsequent target positions from previous positions by integrating the estimated target velocity over time. A variety of filters and other mechanisms may be used to enable a user to input information regarding a target velocity into a gimbal controller.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: June 13, 2017
    Assignee: FLIR Systems, Inc.
    Inventors: Stewart W. Evans, Anca G. Williams
  • Patent number: 9660562
    Abstract: An apparatus for determining start of electric machine is disclosed wherein a frequency of a 3-phase current inputted from a motor is estimated to determine whether the motor has started using a difference between the estimated frequency and a frequency of output voltage of inverter configured to drive the motor.
    Type: Grant
    Filed: June 19, 2014
    Date of Patent: May 23, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Anno Yoo
  • Patent number: 9647588
    Abstract: A system and method for a decay lock loop for time varying current regulation in electric motors determines if a predetermined electrical current regulation level for an electric motor has been obtained within a tuning control time window. A coarse control loop increases or decreases a fast current decay, in response to a determination that the predetermined electrical current regulation level has not been obtained within the tuning control time window, until the predetermined electrical current regulation level falls within the tuning control time window. A fine control loop increments or decrements an amount of fast current decay during a total decay time, in response to a determination that the predetermined electrical current regulation level has been obtained within the tuning control time window, until a predetermined timing of the predetermined electrical current regulation level has been obtained.
    Type: Grant
    Filed: December 30, 2015
    Date of Patent: May 9, 2017
    Assignee: Texas Instruments Incorporated
    Inventors: Sudhir Nagaraj, David H. Elwart, II, Rakesh Raja, Anuj Jain
  • Patent number: 9621046
    Abstract: In a power converter, a reference signal generator generates a reference signal with a predetermined period. A current detector detects a current flowing in the converter. When a value of the detected current is larger than a value of a predetermined current command, a reset signal generator generates a reset signal. A driving unit drives a switch. The switch is turned on, and subsequently is turned off: (i) in synchronization with the reference signal when the reset signal is not outputted before the reference signal is outputted; and (ii) in synchronization with the reset signal when the reset signal is outputted before the reference signal is outputted. However, the switch is turned off in synchronization with the reset signal during a predetermined time including a first predetermined time before an output timing of the reference signal and a second predetermined time after the output timing of the reference signal.
    Type: Grant
    Filed: January 17, 2013
    Date of Patent: April 11, 2017
    Assignee: DENSO CORPORATION
    Inventors: Hirofumi Kinjo, Keiji Shigeoka, Yuji Hayashi, Kimikazu Nakamura
  • Patent number: 9612579
    Abstract: Provided is an electronic clock which is capable of finely controlling a driving force of a normal driving pulse and suppresses variation in current consumption without an increase in circuit size. The electronic clock is configured so that while a chopped driving pulse is output and in an interval in which coil terminals have heretofore been short-circuited, a pulse is output (hereinafter referred to as adjustment pulse) for control from a terminal that is different from a terminal of a motor driver from which the normal driving pulse has been output. The output pattern of the adjustment pulse is changed with reference to a driving rank selecting circuit to increase or decrease a motor driving current and hence change the driving force.
    Type: Grant
    Filed: July 23, 2013
    Date of Patent: April 4, 2017
    Assignee: CITIZEN WATCH CO., LTD.
    Inventors: Yu Takyo, Masaaki Namekawa
  • Patent number: 9602034
    Abstract: A CPU obtains a difference between a data number at timing when an ENC0 signal or an ENC1 signal changes in a case where there is no follow-up delay of a rotor relative to a voltage signal applied to an A-phase coil and a B-phase coil and a data number at timing when the ENC0 signal or the ENC1 signal changes in a case where there is a follow-up delay of the rotor relative to the voltage signal applied to the A-phase coil and the B-phase coil. Then, the CPU controls the voltage signal applied to the A-phase coil and the B-phase coil based on the obtained difference.
    Type: Grant
    Filed: April 29, 2014
    Date of Patent: March 21, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yoshihiro Mizuo
  • Patent number: 9590480
    Abstract: An electric machine comprises a rotor (200) equipped with permanent magnets (204, 206, 208, 210), and a stator (100) equipped with electromagnetic poles. The electric machine is characterized in that several adjacent electromagnetic poles respectively constitute an electromagnetic pole group in which the adjacent electromagnetic poles are spaced apart at a first electromagnetic pole spacing, that adjacent electromagnetic poles belonging to different electromagnetic pole groups are spaced apart at an electromagnetic pole spacing greater than said first electromagnetic pole spacing, that each electromagnetic pole group has an even number of electromagnetic poles, and that adjacent electromagnetic poles of an electromagnetic pole group are linked to each other so as to generate magnetic fields of opposite direction in operation.
    Type: Grant
    Filed: November 29, 2010
    Date of Patent: March 7, 2017
    Assignee: L-3 COMMUNICATIONS MAGNET-MOTOR GMBH
    Inventors: Roland Hagenlocher, Jens Steffen, Anton Müller, Peter Ehrhart
  • Patent number: 9572924
    Abstract: Devices and methods for powering a medical device for sustained delivery of fluids or continuous monitoring of body analyte. The devices may comprise a pumping mechanism, a driving mechanism for activating the pumping mechanism to dispense fluid, and a power source coupled to the driving mechanism and having an energy storage cell for providing a pulsed power to the driving mechanism. The methods may be implemented by activating the driving mechanism using pulsed energy in the form of at least one pulse train pattern accumulated in and discharged from an energy storage component.
    Type: Grant
    Filed: August 2, 2013
    Date of Patent: February 21, 2017
    Assignee: Roche Diabetes Care, Inc.
    Inventors: Ofer Yodfat, Avihoo P. Keret
  • Patent number: 9515591
    Abstract: A rotary drive mechanism provides a mechanism for driving light dispersing element having a high wavelength-moving speed and a high wavelength-resolving power. The rotary drive mechanism includes a stepper motor as a rotary drive source; an update information setter for setting update information corresponding to the amount of change by which the motor should be rotated at a drive timing indicated by an input signal; a position information updater for holding position information which specifies the rotational position of the motor and for updating the position information based on the update information from the update information setter; a winding excitation state determiner for determining the amount or ratio of electric currents passed through the windings of the motor based on the updated position information provided from the position information updater; and a drive controller for controlling the electric currents based on a control signal from the winding excitation state determiner.
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: December 6, 2016
    Assignee: SHIMADZU CORPORATION
    Inventor: Kazumi Yokota
  • Patent number: 9503002
    Abstract: An image forming apparatus includes an engine portion configured to perform image forming, a direct current (DC) motor configured to mechanically operate the engine portion, a driver including a resistor to measure current that flows to the DC motor according to the measured current and configured to provide a predetermined voltage to the DC motor, and a drive controller configured to measure a driving speed of the DC motor based on a voltage value of the resistor and to control the driver to provide a voltage that corresponds to the measured driving speed to the driver.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: November 22, 2016
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hak-young Kim, Hyoung-il Kim, Yong-ho You
  • Patent number: 9503004
    Abstract: A logic circuit controls a bridge circuit connected to a coil of a stepping motor in synchronization with an input pulse, so as to control electric power supplied to the coil of the stepping motor. A back electromotive force detector detects the back electromotive force VBEMF across the coil L. A load angle estimation unit estimates the load angle ? based on the back electromotive force detected in the detection period set in the high-impedance period set for the coil L. A logic circuit is configured to adjust electric power supplied to the coil such that the estimated load angle ? approaches a predetermined target angle ?REF.
    Type: Grant
    Filed: November 7, 2014
    Date of Patent: November 22, 2016
    Assignee: ROHM CO., LTD.
    Inventor: Shigeyuki Inoue
  • Patent number: 9469102
    Abstract: A printing apparatus includes: a printing unit that performs printing on a printing medium; a drive unit that causes the printing unit to move; a power supply unit that supplies power to the drive unit; a detection unit that detects the movement of the printing unit; and a controller that controls an initialization operation related to the printing unit based on a detection result of the detection unit. When power supply from the power supply unit to the drive unit is started, the controller acquires the detection result obtained when power is not supplied, performs the initialization operation in a case where a movement of the printing unit is detected in the detection result, and does not perform the initialization operation in a case where a movement of the printing unit is not detected in the detection result.
    Type: Grant
    Filed: January 28, 2016
    Date of Patent: October 18, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Teruki Kurashina
  • Patent number: 9423787
    Abstract: A programming tool provides an interface between an industrial controller and a motor drive that allows the logic development tool used to program the industrial controller to be used to configure the motor drive and its supported components directly. This allows a programmer to configure the topology for the motor drive and provide configuration data that can be verified directly from within the controller programming software rather than requiring separate programming and diagnostic tools.
    Type: Grant
    Filed: July 23, 2013
    Date of Patent: August 23, 2016
    Assignee: Rockwell Automation Technologies, Inc.
    Inventor: Michael R. Keller
  • Patent number: 9400388
    Abstract: A head-up display device which can reduce heat generation and perform efficient control by controlling a drive current of a motor is provided. After a combiner is held in a display position, a microcomputer controls duty of drive pulse supplied to the motor so that the motor is operated by low torque drive of torque 50% when adjusting an angle of the combiner according to the operation of a forward/backward tilting switch. Furthermore, the microcomputer controls duty of drive pulse supplied to the motor so that the motor is operated by normal torque drive of torque 100% when moving the combiner from a storage position to a display position and from the display position to the storage position according to up-and-down operation.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: July 26, 2016
    Assignee: YAZAKI CORPORATION
    Inventor: Yoshihisa Yamada
  • Patent number: 9366193
    Abstract: An example power management arrangement includes a motor controller configured to communicate power to a motor drive bridge to drive a motor. The motor controller is configurable to selectively receive power from each of a first power supply and a second power supply. The voltage of the power from the first power supply is different than a voltage of the power from the second power supply. An example power adjusting method includes receiving power at a motor controller, adjusting a voltage of the received power using the motor controller, communicating the power with the adjusted voltage from the motor controller to a motor drive bridge to drive a motor.
    Type: Grant
    Filed: December 18, 2009
    Date of Patent: June 14, 2016
    Inventor: Les F. Nelson
  • Patent number: 9337918
    Abstract: A digital payload for processing a sub-band spectrum received on an uplink beam at a communications satellite includes a digital channelizer, a digital switch matrix and a digital combiner. The digital channelizer divides the sub-band spectrum into a plurality of frequency slices that can be routed by the digital switch matrix to any of a number of receiving ports. A digital combiner receives the frequency slices and re-assembles them to form one or more output sub-bands for transmission on an output beam of the communications satellite. The digital payload may also include an embeddable digital regeneration module configured to demodulate some or all of the sub-band spectrum to extract a digital bitstream therefrom. The digital bitstream may be processed to implement code-based multiplexing, switching, access control, and other features.
    Type: Grant
    Filed: April 17, 2014
    Date of Patent: May 10, 2016
    Assignee: The Boeing Company
    Inventors: Douglas T. Bell, Brian A. Clebowicz
  • Patent number: RE48231
    Abstract: A blower system, including a permanent magnet motor and a wind wheel. The permanent magnet motor includes a stator assembly, a rotor assembly, and a motor controller. The rotor assembly includes a salient pole rotor including a rotor core and magnets embedded in the rotor core. The motor controller includes a microprocessor, a frequency inverter, and a sensor unit. The sensor unit inputs a phase current or phase currents, a phase voltage, and a DC bus voltage into the microprocessor. The microprocessor outputs a signal to control the frequency inverter which is connected to a winding of the stator assembly. The ratio between an air gap of the motor and the thickness of the magnets ranges from 0.03 to 0.065, and the ratio between the length of a pole arc and the length of the magnets ranges from 0.8 to 1.0.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: September 29, 2020
    Assignee: ZHONGSHAN BROAD-OCEAN MOTOR CO., LTD.
    Inventors: Zheng Zhang, Jizhong Wang, Mingpan Pan, Yong Zhao, Yiqiao Zhou, Ronghua Bi