Open-loop Stepping Motor Control Systems Patents (Class 318/696)
  • Patent number: 11549568
    Abstract: A device for damping vibrations in a structure including a first (or inner) element rotatably mounted around a rotational axis and a second (or outer) element rotatably mounted around said rotational axis. A radius (R1) of a circle portion delimitating the first element with respect to the rotational axis, being smaller than a radius (r2) of a circle portion delimitating the second element with respect to the rotational axis.
    Type: Grant
    Filed: October 30, 2018
    Date of Patent: January 10, 2023
    Assignee: SOLETANCHE FREYSSINET
    Inventor: Uwe Starossek
  • Patent number: 11502567
    Abstract: The disclosure relates to a stator for a rotating electrical machine. The stator includes: a laminated core which provides stator teeth with respect to an air gap of the rotating electrical machine, and a stator winding which has a plurality of tooth windings, wherein a respective one of the tooth windings is arranged on a respective one of the stator teeth and has a respective first electrical conductor arranged in a plurality of turns running around the respective stator tooth. The disclosure is based on the object of improving the electrical safety with respect to short circuits in the region of the stator winding. It is proposed that the respective tooth winding has a respective second electrical conductor which is electrically insulated from the first electrical conductor and has a plurality of turns arranged in a manner running around the respective stator tooth, wherein the respective turns of the first and second electrical conductors are arranged in a bifilar manner.
    Type: Grant
    Filed: September 27, 2018
    Date of Patent: November 15, 2022
    Assignee: Rolls-Royce Deutschland Ltd & Co KG
    Inventors: Wolfram Siegfried Birkmayer, Stefan Koschik
  • Patent number: 11467476
    Abstract: An optical device includes a movable section including an optical section that deflects video light in accordance with the angle of incidence of the video light incident on a light incident surface and outputs the deflected video light and a holder that supports the optical section, an actuator that rotates the movable section around a first axis, an actuator that rotates the movable section around a second axis, a drive circuit that supplies the actuator with a first drive signal and the actuator with a second drive signal, and a sensor disposed in a position different from the positions on the first and second axes detects the position of the optical section, and the drive circuit adjusts the first and second drive signals in accordance with the position of the optical section detected with the sensor.
    Type: Grant
    Filed: September 29, 2020
    Date of Patent: October 11, 2022
    Assignee: Seiko Epson Corporation
    Inventor: Takao Hirakura
  • Patent number: 11465511
    Abstract: A vehicle includes a multi-core processor having first, second, and cores and having first and second analog-to-digital converters (ADC) associated with the first and second cores, respectively. The first and second ADC are configured to convert analog phase currents to first and second digital phase current values, respectively. The multi-core processor is configured to generate first and second rotor-angle data from digital signals representing a position of the electric machine. The processor is programmed to, via the first core, estimate a first output torque of the electric machine based on the first rotor-angle data and the first digital phase current values, via the second core, estimate a second output torque based on the second rotor-angle data and the second digital phase current values, and, via the third core, command de-activation of the electric machine in response to a difference between the first and second output torques exceeding a threshold.
    Type: Grant
    Filed: January 14, 2020
    Date of Patent: October 11, 2022
    Assignee: Ford Global Technologies, LLC
    Inventors: John Proietty, Susan Rebecca Cikanek, Bader M. Badreddine, William Reynolds, Matthew Allan Herrmann
  • Patent number: 11429067
    Abstract: An electronic timepiece enables driving by appropriate drive conditions even when the load on a motor changes. The electronic timepiece includes a motor having a coil; a driver that is controlled to an on state supplying drive current to the coil, and an off state not supplying the drive current; a driver controller configured to control the driver to the on state or the off state based on a control parameter and current value through the coil; and a control parameter setter configured to maintain or change the control parameter based on the on state or the off state control state of the driver controller.
    Type: Grant
    Filed: March 6, 2020
    Date of Patent: August 30, 2022
    Inventors: Reiko Nagahama, Takashi Kawaguchi
  • Patent number: 11431277
    Abstract: An image forming apparatus and an image forming method are provided. The image forming apparatus includes a printing engine to form an image, a step motor to drive the printing engine, a driving circuit to provide a constant current to the step motor and sense a voltage corresponding to a magnitude of the constant current provided to the step motor, and a processor to calculate a temperature of the step motor based on the voltage sensed by the driving circuit during an excitation period of the step motor and control an operation of the image forming apparatus based on the calculated temperature.
    Type: Grant
    Filed: August 12, 2019
    Date of Patent: August 30, 2022
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Ji-Young Byun, Yong-Ho You, Hyoungil Kim
  • Patent number: 11415434
    Abstract: An apparatus for energy and data transfer, can include a first inductor and a second inductor, wherein the first inductor can be magnetically coupled to the second inductor, and a gap configured between the first inductor and second inductor, wherein the first inductor and the second inductor can transfer energy and data between a white meter and an electronic index. The white meter may be implemented as a flow meter. The electronic index can include an electronic display unit that can be attached to the white meter. The electronic display can include one or more of a display unit, a communications unit, or a combination of a display unit and the communications unit.
    Type: Grant
    Filed: January 22, 2021
    Date of Patent: August 16, 2022
    Assignee: Honeywell International Inc.
    Inventors: Ralf Heinrich Schröder genannt Berghegger, Andreas Wuchrer, Patrick Flacke
  • Patent number: 11409218
    Abstract: An image forming apparatus according to the present disclosure includes a power supply circuit, a driving circuit, an opening/closing unit, a first switch configured to switch to a connected state and a disconnected state, at least one processor including a first mode for executing vector control for controlling the driving circuit and a second mode for controlling the driving circuit. The at least one processor is configured to determine a rotational phase using a detected current and a set control value, to control the driving circuit, to execute discriminating a type of the motor based on the detected current in the second mode, and to set the control value based on a result of the discriminating. The result based on the detected current in a state where the first switch is in the disconnected state is not used to set the control value.
    Type: Grant
    Filed: January 27, 2021
    Date of Patent: August 9, 2022
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yuta Nito
  • Patent number: 11378920
    Abstract: To reliably rotate a step motor while reducing power consumption, a step motor driving device includes a step motor that includes a rotor, stator, coil, driver circuit that outputs a measurement drive signal to the coil, phase detecting circuit that detects a counter-electromotive current that is generated in the coil after the output of the measurement drive signal and determines whether a phase of the rotor is a desired phase based on the detected counter-electromotive current, and a control unit that, if the phase is the desired phase, controls the step motor by a first driving method in which the drive circuit outputs a first drive signal for rotating the rotor by one step, and, if not, controls the step motor by a second driving method different from the first driving method so as to restrict the rotation of the rotor.
    Type: Grant
    Filed: June 21, 2019
    Date of Patent: July 5, 2022
    Assignee: CITIZEN WATCH CO., LTD.
    Inventor: Yu Takyoh
  • Patent number: 11374515
    Abstract: An operation method and an operation device of a motor driver for driving a motor are provided. The operation method includes: establishing a hysteresis control method; and adjusting a switch frequency of a power module for operating the motor by using the hysteresis control method according to a change of rotation speed of the motor and a current switch frequency.
    Type: Grant
    Filed: December 29, 2020
    Date of Patent: June 28, 2022
    Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Chih-Chiang Wu, Yun-Huan Li, Hsin-Ping Chou, Shih-Hsiang Wu
  • Patent number: 11323052
    Abstract: Automated speed ramp control of stepper motor acceleration and deceleration using direct memory access (DMA) and core independent peripherals (CIPs) comprises a numerically controlled oscillator (NCO) controlled through direct memory access (DMA) transfers of prescale values used in combination with a clock oscillator to generate clock pulses that are a function of the clock oscillator frequency and the prescale values. This automates changing the frequency of the NCO, thereby controlling steeper motor speed, without requiring computer processing unit (CPU) overhead. The DMA module is enabled during a first number of clock pulses for step speed acceleration, disabled during a second number of clock pulses for normal operation at full step speed, and then re-enabled during a third number of clock pulses for step speed deceleration. A table in memory may store and provide a plurality of acceleration and deceleration prescale values for DMA transfers to the NCO.
    Type: Grant
    Filed: January 23, 2019
    Date of Patent: May 3, 2022
    Assignee: Microchip Technology Incorporated
    Inventor: Keith Edwin Curtis
  • Patent number: 11255557
    Abstract: A retrofit damper system is configured for installation in existing ductwork including a duct supplying conditioned air through a register boot to a register vent. The retrofit damper system includes a damper assembly including a damper blade and a damper motor configured to drive the damper blade between a closed end position and an open end position. A control module includes a control module housing and a controller within the control module housing that is configured to regulate operation of the damper motor. The controller outputs a drive signal that causes the electric damper motor to drive the damper blade to the desired position and creates a plurality of interruptions in the drive signal while driving the damper blade. A sense circuit senses back EMF signal, and the controller estimates a blade position based at least in part on the back EMF signals.
    Type: Grant
    Filed: June 12, 2018
    Date of Patent: February 22, 2022
    Assignee: Ademco Inc.
    Inventors: Patrick Gonia, Daniel Waseen, Liliana Reategui
  • Patent number: 11245347
    Abstract: The present invention relates to a driving circuit and a driving method for a stepping motor, and an electronic machine using the same. A current value setting circuit generates a current setting value. A constant current chopper circuit generates a pulse modulation signal, which pulse-width modulates by having a detection value of a coil current flowing through a coil approach close to the current setting value. A logic circuit controls a bridge circuit connected to the coil of the stepping motor according to the pulse modulation signal. The current value setting circuit sets the current setting value to a predetermined full-torque setting value in a first period after rotation starts, reduces the current setting value to a predetermined second setting value less than the first setting value in the following second period, and switches to a high-efficiency mode and adjusts the current setting value by means of feedback control.
    Type: Grant
    Filed: February 24, 2020
    Date of Patent: February 8, 2022
    Assignee: ROHM CO., LTD.
    Inventors: Masanori Tsuchihashi, Mitsuo Okada, Ryota Kobayashi
  • Patent number: 11193417
    Abstract: The present invention relates to a control device and to a control method for a vehicle drive mechanism including a moving body having a movability range regulated by two stoppers, and a sensor which senses a position of the moving body. The control device of the present invention learns an output of the sensor corresponding to a contact state of a high-rigidity stopper, and limits, to a lower level, an operation variable of the actuator for moving the moving body toward a low-rigidity stopper along with an increase in an amount of change in the output of the sensor from the contact state of the high-rigidity stopper. Then, the control device learns the output of the sensor corresponding to the contact state of the low-rigidity stopper, and controls the actuator based on the output of the sensor learned at both the stopper positions.
    Type: Grant
    Filed: July 7, 2020
    Date of Patent: December 7, 2021
    Assignee: Hitachi Astemo, Ltd.
    Inventors: Naoki Okamoto, Yuya Shinozaki
  • Patent number: 11169007
    Abstract: A novel multi-phase resolver topology and apparatus is provided for measuring a displacement of movement body more precisely and economically. In variable reluctance (VR) resolvers, N coil-poles are placed at N equally spaced positions over one turn of the stator, N being an odd number greater than or equal to 5. Each coil serves both as an excitation and a sensing coil, and all N coils are wound with the same number of turns at an identical electrical polarity. Depending on the installed rotor lobe shape, N sinusoidal or quasi-square waveform displacement signals are sensed on multi-phase resolver, and from which two-phase orthogonal displacement signals are optimally and differentially synthesized. The multi-phase resolver topology and differential synthesis method is also applied to other types of resolvers, such as wound-rotor, inductance, capacitive, and magnetic resolvers.
    Type: Grant
    Filed: May 3, 2021
    Date of Patent: November 9, 2021
    Inventor: Chun Soo Park
  • Patent number: 11165377
    Abstract: A control device for a stepping motor capable of hold control that can smoothly reduce an excitation current at a rotation stopping time of the stepping motor is provided. A control device (10) for a stepping motor (20) causes an excitation current to flow in a plurality of coils to rotate a rotor. The control device (10) includes a driving circuit (40) that applies a driving voltage to the coils, and a control circuit (30) that controls the driving voltage. The control circuit (30) performs hold control to move the rotor to a predetermined stop position by changing a magnitude of the excitation current flowing in the coils so that the magnitude of the excitation current becomes close to a target current value that gradually decreases, in a hold time period at a rotation stopping time of the stepping motor (20).
    Type: Grant
    Filed: May 23, 2019
    Date of Patent: November 2, 2021
    Assignee: MINEBEA MITSUMI INC.
    Inventors: Ayaka Shimada, Kazuo Takada, Kei Yamazaki
  • Patent number: 11147208
    Abstract: An agricultural planting implement is used to plant seed in a field. The implement includes an electrically-driven seed meter that is spaced on a toolbar of the implement. The seed meter, or other metering member, is a precision meter that is used to control the volume, spacing, and location of a seed that is delivered from a meter to the field. A seed source, such as a seed cart or hopper, is attached to the seed meters to provide an on-demand amount of seed to the meters for planting in the field.
    Type: Grant
    Filed: May 10, 2019
    Date of Patent: October 19, 2021
    Assignee: Kinze Manufacturing, Inc.
    Inventor: Matthew Wilhelmi
  • Patent number: 11143525
    Abstract: A novel multi-phase resolver topology and apparatus is provided for measuring a displacement of movement body more precisely and economically. In variable reluctance (VR) resolvers, N coil-poles are placed at N equally spaced positions over one turn of the stator, N being an odd number greater than or equal to 5. Each coil serves both as an excitation and a sensing coil, and all N coils are wound with the same number of turns at an identical electrical polarity. Depending on the installed rotor lobe shape, N sinusoidal or quasi-square waveform displacement signals are sensed on multi-phase resolver, and from which two-phase orthogonal displacement signals are optimally and differentially synthesized. The multi-phase resolver topology and differential synthesis method is also applied to other types of resolvers, such as wound-rotor, inductance, capacitive, and magnetic resolvers.
    Type: Grant
    Filed: February 8, 2021
    Date of Patent: October 12, 2021
    Inventor: Chun Soo Park
  • Patent number: 11137724
    Abstract: An electronic timepiece can prevent overrunning when driving a motor at a high speed. The electronic timepiece has a controller that controls a driver to an on state or an off state according to the current value detected by the current detector; a polarity changer that determines driving one step of the motor ended and changes the polarity of the drive current when the on time or off time is detected to meet a specific condition; and a drive period adjuster that sets the terminal supplying the drive current to the coil to a first state if the remaining drive step count is greater than the remaining count evaluation number, and if the remaining drive step count is less than or equal to the remaining count evaluation number, sets the terminal to a second state in which the brake force applied to the rotor is greater than in the first state.
    Type: Grant
    Filed: March 24, 2020
    Date of Patent: October 5, 2021
    Inventor: Takashi Kawaguchi
  • Patent number: 11128120
    Abstract: In an inductive load control device, an energization controller controls an operation of an H-bridge circuit to switch from an energized state to a regenerative state when a load current value is equal to or greater than a first threshold value at a time after a mask time has elapsed from a start time of a reference cycle, and a short-circuit determination processor determines whether the short-circuit abnormality has occurred based on whether the load current value is equal to or greater than a second threshold value greater than the first threshold value. The short-circuit determination processor further determines whether the short-circuit abnormality has occurred based on the regenerative current value in the regenerative state when the load current value does not reach the second threshold value within the mask time.
    Type: Grant
    Filed: June 2, 2020
    Date of Patent: September 21, 2021
    Assignee: DENSO CORPORATION
    Inventors: Yasuhiko Harada, Mitsuru Aoki
  • Patent number: 11086273
    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 24, 2019
    Date of Patent: August 10, 2021
    Assignee: CITIZEN WATCH CO., LTD.
    Inventors: Yu Takyoh, Toshiaki Fukushima, Toshinari Maeda, Daisuke Iri, Daisuke Matsuoh
  • 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: 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: 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: 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: 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