Patents Examined by Devon A Joseph
  • Patent number: 10308225
    Abstract: Method and apparatus are disclosed for accelerometer-based windshield wiper monitoring. A vehicle includes an accelerometer affixed to a vehicle window, a windshield wiper to actuate across the vehicle window, and a processor. The processor is configured to determine an acoustic profile corresponding to the windshield wiper based on structure-borne audio data received from the accelerometer, determine whether a bandlimited decibel level of the acoustic profile exceeds a threshold, and responsively provide an alert via a vehicle display.
    Type: Grant
    Filed: August 22, 2017
    Date of Patent: June 4, 2019
    Assignee: Ford Global Technologies, LLC
    Inventors: Joshua Wheeler, Scott Amman, Doug B. Thornburg, Brian Bennie, Mahmoud Ghannam
  • Patent number: 10308136
    Abstract: A control system for a vehicle having two motors is provided to limit damage on rotary members even if an excessive torque is applied from drive wheels. The control system comprises a first motor, a second motor, and a locking mechanism, and a differential mechanism disposed between the first motor and the drive wheels. The locking mechanism halts one of rotary elements of a differential mechanism when torque of the rotary member is small, and allows the rotary element to rotate when the torque of the rotary member is large. A controller is configured to increase power output of the first motor and decrease power output of the second motor during propulsion on an uneven road surface.
    Type: Grant
    Filed: April 6, 2017
    Date of Patent: June 4, 2019
    Inventors: Hiroaki Kimura, Tomohito Ono, Hiroto Hashimoto
  • Patent number: 10298162
    Abstract: Disclosed is a brushless-motor drive apparatus provided with: a current detecting means (6) for detecting currents flowing through armature windings (9) during periods when switching elements (5H, 5L) of a drive circuit are ON; a calculation processing means for comparing a target current value and the detected current value, and calculating voltage command values to be applied to the armature windings (9); and a PWM driving means (4) for controlling the ON/OFF of the switching elements on the basis of the voltage command values.
    Type: Grant
    Filed: May 14, 2010
    Date of Patent: May 21, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Chiaki Fujimoto, Masahiro Kimata
  • Patent number: 10298158
    Abstract: A feedback amount calculation unit uses a deviation of a current from its command value or a deviation of an air-gap flux from its command value to calculate a feedback amount. A voltage error calculation unit calculates a variation range of a voltage error between a voltage value based on a voltage equation of the electric motor and a voltage command. The presence or absence of step-out of the electric motor is determined by comparison between the variation range of the voltage error and the feedback amount.
    Type: Grant
    Filed: January 6, 2015
    Date of Patent: May 21, 2019
    Assignee: Daikin Industries, Ltd.
    Inventors: Hiroshi Hibino, Nobuki Kitano
  • Patent number: 10277114
    Abstract: Typically, power factor is improved by adding a full power factor correction (PFC) stage between the rectifier and the power converter. This disclosure applies line voltage modulation to the control feedback of an isolated full bridge converter, thereby combining the PFC stage with the isolated power stage and forming a single state isolated power converter.
    Type: Grant
    Filed: September 19, 2016
    Date of Patent: April 30, 2019
    Assignee: Black & Decker Inc.
    Inventors: Pradeep M. Pant, Michael K. Forster
  • Patent number: 10265849
    Abstract: A holding system includes a force control module configured to generate a force signal to cause a holding device to perform at least one of a hold stroke and a release stroke. The hold stroke includes transitioning a gripping element of the holding device to a first position to grip an object. The release stroke includes transitioning the gripping element to a second position to release the object. The holding device is non-backdrivable. A stall detection module is configured to (i) monitor a sensor signal received from a sensor of an electric motor assembly of the holding device and (ii) detect a first stall condition of an electric motor based on the sensor signal. A shut off module is configured to shut off current to the electric motor based on the detection of the first stall condition during or at an end of the release stroke.
    Type: Grant
    Filed: November 10, 2017
    Date of Patent: April 23, 2019
    Assignee: Delaware Capital Formation, Inc.
    Inventors: Orlando Trujillo, James W. Geary
  • Patent number: 10263547
    Abstract: A method includes monitoring electrical output in an open control loop from a variable speed drive to a remote permanent magnet motor, the variable speed drive electrically connected to the permanent magnet motor via a power transmission line. The method includes, in response to detecting a variation in the electrical output at the variable speed drive, synchronizing a frequency of a rotor shaft of the permanent magnet motor with a constant electromagnetic field frequency of a stator of the permanent magnet motor for a predetermined period of time. After the predetermined period of time, the method includes increasing the electromagnetic field frequency of the stator to an operational frequency threshold to accelerate the frequency of the rotor shaft of the permanent magnet motor. In response to reaching the operational frequency threshold, the method includes determining an internal position of the rotor based on the variable electromagnetic field frequency.
    Type: Grant
    Filed: October 9, 2015
    Date of Patent: April 16, 2019
    Assignee: Direct Drive Systems, Inc.
    Inventor: Costin Ifrim
  • Patent number: 10254740
    Abstract: A positioning control system is provided with a state-feedback control system with a state observer as a full-closed control system for driving and controlling a motor so that a load shaft, which is an output shaft of a strain wave gearing, is positioned at a target position on the basis of a load shaft position actually detected. The state observer estimates a motor shaft position and a motor velocity based on a control input for the motor and the load shaft position. The state-feedback control system feeds back the state quantity of the object of control using the load shaft position as well as estimated motor shaft position and estimated motor velocity obtained by the state observer. It is possible to suppress resonant vibration caused by angular transmission error in the strain wave gearing and perform highly accurate positioning.
    Type: Grant
    Filed: September 27, 2016
    Date of Patent: April 9, 2019
    Assignees: Harmonic Drive Systems Inc., Nagoya Institute of Technology
    Inventors: Masafumi Yamamoto, Yoshifumi Okitsu, Makoto Iwasaki
  • Patent number: 10234914
    Abstract: A driving circuit of an electric motor includes: a PWM input pin for externally receiving an input pulse modulation signal with an input duty cycle; a duty cycle to digital converter for receiving and converting the input pulse modulation signal into a first digital value; a slope setting pin for receiving information indicative of a slope of an output duty cycle corresponding to the input duty cycle; a slope acquisition unit for acquiring a second digital value corresponding to the information indicative of the slope; a duty cycle computation unit for generating a linearly increased duty cycle instruction value corresponding to the first digital value by referring to the slope; a digital pulse width modulator for generating a controlling pulse having the output duty cycle corresponding to the duty cycle instruction value; and an output circuit for driving the electric fan motor in accordance with the controlling pulse.
    Type: Grant
    Filed: May 4, 2015
    Date of Patent: March 19, 2019
    Assignee: ROHM CO., LTD.
    Inventors: Yuki Gohara, Tomofumi Mishima
  • Patent number: 10224857
    Abstract: Provided is a motor controller that controls a motor system including: a power converter, a smoothing capacitor, a three-phase AC motor, and a current sensor. The motor controller is provided with an electronic control unit. The electronic control unit specifies a target phase that is a phase of a second phase voltage command signal having a largest difference from a first phase voltage command signal having a signal level that is neither a maximum nor a minimum signal level, based on three phase voltage command signals generated from the detection value of the current sensor, and corrects the detection value of the current sensor, which detects the phase current of the target phase, such that a terminal voltage of the smoothing capacitor matches the desired voltage value.
    Type: Grant
    Filed: September 8, 2014
    Date of Patent: March 5, 2019
    Inventors: Toshifumi Yamakawa, Masaki Okamura, Naoyoshi Takamatsu
  • Patent number: 10211771
    Abstract: A drive apparatus is provided with a motor, a plurality of substrates and a plurality of connectors. The substrates are provided in one side of the motor in the axial direction thereof, the substrates including switching elements and control components mounted thereon. The connectors are provided in an opposite side against the motor across the substrates, the connectors including connector terminals connected to one of the substrates. The substrates include two or more non-overlapped regions where no substrates are overlapped when projecting the substrates in the axial direction. The non-overlapped regions include a connector connecting region connected to the connector terminals, and a motor line connecting region connected to winding groups of the motor corresponding to every phase of each winding group.
    Type: Grant
    Filed: April 5, 2017
    Date of Patent: February 19, 2019
    Inventor: Masashi Yamasaki
  • Patent number: 10193476
    Abstract: A system for controlling operation of a brushless DC motor is provided. The system includes a memory, driving profile and motor controllers, and an inverter. The memory stores: a scaling factor indicative of how much to increase an operating parameter of a base driving profile; and the base driving profile indicative of speed over time of a drive cycle of the brushless DC motor. The driving profile controller generates a motor driving profile, indicating an operating parameter for driving the brushless DC motor, where the operating parameter is based on (i) the scaling factor, and (ii) the base driving profile. The controller generates a control signal based on the operating parameter of the motor driving profile. The inverter: receives a direct current from a DC source; responsively to the control signal, converts the direct current to an alternating current; and drives the brushless DC motor via the alternating current.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: January 29, 2019
    Assignee: Marvell International Ltd.
    Inventors: Yichao Wang, Foo Leng Leong, Edy Susanto
  • Patent number: 10171021
    Abstract: Methods may involve determining a minimum voltage for a voltage command. A maximum voltage for the voltage command may be determined. A first representation of a first performance curve corresponding to the minimum voltage may be determined. A second representation of a second performance curve corresponding to the maximum voltage may be determined. An operating point to be achieved through the voltage command may be obtained. An evaluation may be made of whether the operating point lies between the first and second representations. When the operating point lies between the first and second representations, an interpolation may be conducted between the first and second representations to determine a magnitude of the voltage command.
    Type: Grant
    Filed: April 4, 2017
    Date of Patent: January 1, 2019
    Inventors: Xin Jing, Brian A. Welchko, Constantin C. Stancu
  • Patent number: 10158303
    Abstract: Methods, apparatus, systems and articles of manufacture to perform torque balance control of co-shafted motors are disclosed. An example method includes calculating a first torque value based on first phase currents of a first motor that is driving a shaft connected to a control surface, and calculating a second torque value based on second phase currents of a second motor that is driving the same shaft. The example method also includes determining a first shared torque value based on the first calculated torque value and a first sharing factor, and determining a second shared torque value based on the second calculated torque value and a second sharing factor. The example method also includes determining a torque error based on the first shared torque value and the second shared torque value, and determining a first torque adjustment associated with the first motor based on the torque error.
    Type: Grant
    Filed: September 15, 2016
    Date of Patent: December 18, 2018
    Assignee: The Boeing Company
    Inventors: Mun Shin Chik, Darren Paschedag, Neil Pande, Shengyi Liu
  • Patent number: 10148208
    Abstract: The invention relates to a control device for an electric machine with a stator and a rotor, comprising a temperature detection device which is designed to detect the temperature of the stator and the temperature of the rotor, as well as a calculation device which is designed to adjust the operating point of said electric machine on the basis of a specified torque, the detected temperature of the stator, the detected temperature of the rotor, and a predefined thermal load distribution of said stator and rotor. The invention also relates to a vehicle and to a corresponding method for controlling an electric machine.
    Type: Grant
    Filed: August 13, 2015
    Date of Patent: December 4, 2018
    Assignee: Robert Bosch GmbH
    Inventors: Gunther Goetting, Lanouar Chouk
  • Patent number: 10141871
    Abstract: A control method which is deployed in a control installation of an electric motor, the control installation including a first converter controlled for the application of the first voltage pulse edges to an electric motor of a first pulse width modulation, obtained by comparing a first carrier signal, applied at a first chopping frequency, with a first modulating signal, a second converter controlled of a second pulse width modulation, obtained by comparing a second carrier signal, applied at a second chopping frequency, with a second modulating signal. The control method involves the determination of a notional optimum phase-shift angle on the basis of the first chopping frequency and the second chopping frequency.
    Type: Grant
    Filed: January 4, 2017
    Date of Patent: November 27, 2018
    Inventors: Mehdi Messaoudi, Hocine Boulharts
  • Patent number: 10135382
    Abstract: A motor control device calculates a velocity difference based on a velocity command and a velocity detection value of a motor and an excitation current common phase voltage difference based on an excitation current command value and an excitation current detection value, and judges that demagnetization occurs when the following conditions are all met: the excitation current common phase voltage difference exceeds a voltage threshold; the velocity difference exceeds a velocity threshold; and acceleration is being performed.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: November 20, 2018
    Inventors: Tomohiro Shibata, Yoshimaro Hanaki
  • Patent number: 10110150
    Abstract: A primary magnetic flux command value is changed in accordance with a torque of a rotary electric motor to control a current phase of an armature current with respect to a q axis that advances by ?/2 with respect to a d axis in phase with a field flux to be a desired phase in accordance with the torque.
    Type: Grant
    Filed: October 8, 2013
    Date of Patent: October 23, 2018
    Inventors: Takeshi Araki, Naoto Kobayashi, Nobuki Kitano
  • Patent number: 10090878
    Abstract: A system and a method for driving an electrical motor with a drive unit including a wireless transceiver. A user may wirelessly couple a user input device with the transceiver, and use a drive application to, optionally, update configuration information including drive control parameters, update application logic residing in the drive unit, and/or upload performance parameters.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: October 2, 2018
    Assignee: Franklin Electric Co., Inc.
    Inventors: Greg A. Emshwiller, Richard J. Halsey, Christopher J. Hawkins, Douglas C. Lynn, Robert C. Smith, Ross E. Waite, James H. Spreen
  • Patent number: 10090788
    Abstract: A motor drive system and method for controlling an electric motor. The motor drive system includes a plurality of phase lines switchably connected to the electric motor, a plurality of controllable switches, and a controller. The controller is communicatively coupled to the plurality of controllable switches and configured to receive a signal indicative of a rotor speed and a rotor position from the rotor sensor. The controller generates a value expressing a back-electromotive force (back-EMF) as a function of the rotor position with respect to a rotating frame of reference. Based on the rotor position, the controller determines a plurality of phase currents that reduce a torque ripple of the electric motor to approximately zero. The controller actuates the controllable switches to supply the electric motor with the plurality of phase currents.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: October 2, 2018
    Assignee: Robert Bosch GmbH
    Inventor: Leandro M. Lorilla