Patents Examined by Iftekhar Mustafa
  • Patent number: 10390841
    Abstract: A motorized surgical instrument is disclosed. The surgical instrument includes a control circuit configured to control the movement of an end effector. If the end effector moves outside a predetermined acceptable range, the control circuit may create a dynamic brake to resist the undesired movement of the end effector. The control circuit may apply pulse width modulated (PWM) current to resist the undesired movement of the end effector outside a predetermined acceptable range.
    Type: Grant
    Filed: June 20, 2017
    Date of Patent: August 27, 2019
    Assignee: ETHICON LLC
    Inventors: Frederick E. Shelton, IV, David C. Yates, Jason L. Harris
  • Patent number: 10361030
    Abstract: Start capacitor assemblies and methods for operating electric motors are described. In one example, a start capacitor assembly for connection to an electric motor includes a film capacitor and a resistor. The film capacitor has a first terminal and a second terminal.
    Type: Grant
    Filed: August 15, 2012
    Date of Patent: July 23, 2019
    Assignee: NUEVA GENERACION MANUFACTURAS S.A. DE C.V.
    Inventor: Francisco Javier Curiel
  • Patent number: 10277150
    Abstract: Method of driving a single-coil motor having a stator and a rotor and a coil, comprising the steps of: monitoring a position signal and determining when said signal passes a first threshold; b) providing control signals for energizing the coil; c) a predefined period later, providing control signals for stopping or reducing the energization of the coil; d) monitoring a second signal indicative of the coil current, and determining a third time when said signal passes a second threshold level; and monitoring the first signal, and determining a fourth time when said signal passes a third threshold level; e) updating the prediction period; f) repeating steps b) to e). A driver circuit adapted for performing such method. A system comprising such driver circuit.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: April 30, 2019
    Assignee: Melexis Bulgaria Ltd
    Inventors: Dirk Leman, Rumen Marinov Peev, Petko Nedelev
  • Patent number: 10256763
    Abstract: A motor control device for a motor includes: an inverter circuit supplying power of a battery to the motor; an inverter input voltage detector detecting an inverter input voltage; and a controller including a drive controller for the motor and an abnormality determination unit for determining power feeding abnormality. The abnormality determination unit determines the power feeding abnormality when the inverter input voltage is lower than a voltage threshold and a current from the battery to the inverter circuit is in a determinable range. The abnormality determination unit determines, based on a motor current electrically conducted to the motor or a rotational speed of the motor, whether the current is in the determinable range. A determination threshold in accordance with the determinable range is set that the inverter input voltage is equal to or higher than the voltage threshold when the power feeding region is normal.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: April 9, 2019
    Assignee: DENSO CORPORATION
    Inventors: Haruo Suzuki, Yoshihide Kuroda
  • Patent number: 10224850
    Abstract: An operating method of a synchronous machine is provided, the operating method including: generating an MTPA (Maximum Torque Per Ampere) curve, based on a current limiting circle depending on a rated current of an inverter or a motor and a torque curve depending on a torque command; generating a voltage limiting ellipse, based on a DC-link voltage; displaying, on an X-Y plane, the current limiting circle, the torque curve, the MTPA curve, and the voltage limiting ellipse; and computing a d-axis current and a q-axis current, based on an intersection point between at least two of the current limiting circle, the torque curve, the MTPA curve, and the voltage limiting ellipse, displayed on the X-Y plane.
    Type: Grant
    Filed: April 21, 2016
    Date of Patent: March 5, 2019
    Assignee: LSIS CO., LTD.
    Inventor: Eun Woo Lee
  • Patent number: 10224862
    Abstract: A motor driving apparatus includes an AC-DC conversion unit that converts AC power into DC power, a power storage unit provided in a DC link between the AC-DC conversion unit and a DC-AC conversion unit, an initial charging unit that is provided in the DC link, includes a switch unit and a charging resistor connected to the switch unit in parallel, and initially charges the power storage unit, an electromagnetic contactor that opens and closes an electrical path between the AC power source and the AC-DC conversion unit, and a control unit, and after completion of driving of a motor, the control unit performs an opening operation on the electromagnetic contactor and the switch unit and performs a turn-on operation on each of the switching devices provided on the upper and lower arms in the same phase to discharge charge stored in the power storage unit by the charging resistor.
    Type: Grant
    Filed: January 13, 2017
    Date of Patent: March 5, 2019
    Assignee: FANUC CORPORATION
    Inventor: Wataru Kuroki
  • Patent number: 10193478
    Abstract: A motor driving device and driving method of the same used to surely suppress the influence of counter electromotive force is provided. The motor driving device 100 includes an auto-decay portion 141. The auto-decay portion 141 controls a path of a electric current flow in a motor coil when supplying the electric current and when decaying the electric current. The influence of counter electromotive force generated in a stepping motor 200 can be suppressed by the auto-decay portion 141 configured to control so that a ratio or an decay time of a slow decay mode and a fast decay mode of previous cycle is different from a ratio or an decay time of the slow decay mode and the fast decay mode of current cycle.
    Type: Grant
    Filed: April 20, 2016
    Date of Patent: January 29, 2019
    Assignee: Rohm Co., Ltd.
    Inventors: Hiroki Hashimoto, Ryoichi Inoue
  • Patent number: 10164563
    Abstract: An electric power system for supplying power to a permanent magnet electric machine includes a high-voltage DC power source that is disposed to supply electric power to a front-end converter connected via a high-voltage DC bus to an electric inverter that is connected to the electric machine. A method for operating a control system includes monitoring the electric machine. Upon detecting a fault associated with the electric machine, a controller commands operation of the front-end converter to generate a voltage level on the high-voltage DC bus that is a maximum setpoint voltage level and monitors back-emf voltage level from the electric machine. The inverter is controlled to a three-phase open state when the back-emf voltage level is less than the maximum setpoint voltage level. The inverter is controlled to a three-phase short state when the back-emf voltage level is greater than the maximum setpoint voltage level.
    Type: Grant
    Filed: April 15, 2016
    Date of Patent: December 25, 2018
    Assignee: GM Global Technology Operations LLC
    Inventors: Xin Jing, Brian A. Welchko, Constantin C. Stancu
  • Patent number: 10153633
    Abstract: The invention relates to a device and to a method for monitoring an electrical network in a rail vehicle. The electrical network includes at least one converter, at least one drive motor, at least one first phase line for electrical connection of the at least one converter and the at least one drive motor. A magnitude of a current change of a first phase current is determined. A network error in a partial network on the machine side is detected if at least one criterion based on the current change is met. The criterion based on a current change is met when the magnitude of the current change of the first phase current is greater than a predetermined current change threshold.
    Type: Grant
    Filed: September 23, 2015
    Date of Patent: December 11, 2018
    Assignee: Bombardier Transportation GmbH
    Inventor: Gerhard Isepponi
  • Patent number: 10148166
    Abstract: A power converter includes a control unit that generates a modulated wave synchronized with an output voltage command and a carrier wave having a frequency higher than a frequency of the modulated wave, the control unit controlling the power converter by comparing the modulated wave and the carrier wave to output a switching signal for driving a switching element. When a modulation factor in converting DC power into AC power is equal to or higher than a mode switching modulation factor and is lower than ?/4, the power converter converts the DC power into the AC power in an over-modulation mode, in which switching of the switching element is stopped for a period longer than one cycle of the carrier wave, in a first period in which an output voltage command is positive and timing of a positive peak value of the output voltage command is included.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: December 4, 2018
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yoshinori Yamashita, Sho Kato, Hisanori Yamasaki
  • Patent number: 10133249
    Abstract: A servomotor controller includes a first and a second converter circuit that perform conversion between AC power of a power supply and DC power, a first inverter circuit that performs conversion between the DC power on the DC side of the first converter circuit and AC power on the side of a first motor, a second inverter circuit that performs conversion between the DC power on the DC side of the second converter circuit and AC power on the side of a second motor, and a power calculation unit that calculates an amount of power of the first motor, wherein control is performed so that the regenerative power of the first motor is supplied to the second motor through the power supply or the regenerative power of the second motor is supplied to the first motor through the power supply, on the basis of the amount of power.
    Type: Grant
    Filed: January 17, 2017
    Date of Patent: November 20, 2018
    Assignee: FANUC CORPORATION
    Inventors: Satoshi Ikai, Kenichi Takayama
  • Patent number: 10122314
    Abstract: A motor control apparatus for controlling driving of a motor includes an inverter which supplies power to a motor having a position detector, and circuitry which controls power conversion of the inverter based on at one or more predetermined control parameters, determine a type of the motor based on a signal received from the position detector of the motor, and control notification of setting confirmation of one or more of the predetermined control parameters in accordance with the type of the motor.
    Type: Grant
    Filed: September 13, 2016
    Date of Patent: November 6, 2018
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Yusuke Oka, Tadashi Okubo
  • Patent number: 10122310
    Abstract: A tactile vibration control system and method for a smart terminal. The system includes: a command generator, a tactile driver, a linear resonant actuator, a sensing module, a feedback unit and a comparator; by arranging a plurality of sensors that monitor or sense the vibrating status of the linear resonant actuator, channels of the sensor signals are generated when the actuator vibrates; the feedback unit sends the sensing signals characterizing the physical quantities related to the vibration modes output by the plurality of sensors to the comparator as the feedback signal; and the comparator generates an error signal according to the feedback signal and a desired signal in the input signal and sends the error signal to the command generator so that the command generator adjusts the generated initial commanding signal according to the error signal and achieves the close-loop control of the linear resonant actuator.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: November 6, 2018
    Assignee: Goertek Inc.
    Inventors: Bo Li, Yongqiang Feng, Shasha Lou
  • Patent number: 10103674
    Abstract: In a drive control apparatus for a multiple-winding motor including a power converter for driving a winding group per each winding group of a multiple-winding motor having a plurality sets of winding groups, a compensation amount calculator obtains, by using a signal of a first controller controlling a first power converter driving a first winding group among the winding groups, a compensation amount for compensating a signal of an other controller controlling an other power converter other than the first power converter, based on the compensation amount obtained by the compensation amount calculator. A signal of the other controller is compensated to control the other power converter, and the first power converter is controlled without compensating a signal of a first controller.
    Type: Grant
    Filed: November 20, 2014
    Date of Patent: October 16, 2018
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Yuriko Okamoto, Akira Satake, Hiromitsu Suzuki, Masahiko Tsukakoshi, Ritaka Nakamura
  • Patent number: 10103670
    Abstract: The present disclosure provides a method and a device for controlling a power factor on motor side and a system having the same, and the method includes: controlling the motor using a control approach of Id?=0 so as to obtain quadrature-axis voltage Uq? and direct-axis voltage Ud? in a virtual coordinate system of a current control cycle; calculating a first control value according to Uq? and Ud?; obtaining a power factor control target value, and calculating a target control value according to the power factor control target value; performing a PI control on a difference between the target control value and the first control value so as to obtain a coordinate deviation angle, and overlapping the coordinate deviation angle to a motor angle of the current control cycle so as to build a virtual coordinate system of a next control cycle, such that the power factor on the motor side is controllable.
    Type: Grant
    Filed: September 11, 2015
    Date of Patent: October 16, 2018
    Assignee: GUANGDONG MEIZHI COMPRESSOR CO., LTD.
    Inventors: Wanjie Song, Xinjie Ren, Siqing Liao, Weimin Xiang, Yongjun Fu
  • Patent number: 10084365
    Abstract: A method for power conversion generally includes a step of generating a drive current in a first winding of an electromagnet in a motor mode. The electromagnet may be mounted spatially proximate a rotor and has a bifilar coil. The bifilar coil may have a pair of conductors that form the first winding and a second winding. The second winding may be spatially parallel to, spatially separated from, and electrically isolated from the first winding. The rotor may be rotatably mounted and has a plurality of permanent magnets. Further steps generally include rotating the rotor in response to the drive current, removing the drive current from the first winding in a generator mode and inducing a load current through the second winding to an electrical load in response to a torque applied to the rotor.
    Type: Grant
    Filed: June 22, 2017
    Date of Patent: September 25, 2018
    Inventor: Harivallabh Pandya
  • Patent number: 10061276
    Abstract: A machine learning system according to an embodiment of the present invention includes a state observer for observing the winding temperature, winding resistance, current value, and rotor magnetic flux density of a magnetization unit having a magnetizing yoke and windings; a reward calculator for calculating a reward from the rotor magnetic flux density obtained by the state observer; and a learning unit for updating an action value table based on a magnetization rate calculated from the rotor magnetic flux density and a target magnetic flux density, the winding temperature, and the winding resistance.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: August 28, 2018
    Assignee: FANUC CORPORATION
    Inventor: Makoto Funakubo
  • Patent number: 10008968
    Abstract: A system includes an electric motor controller configured to be coupled to an electric motor is provided. The controller includes a first power input, a second power input, and a third power input, each of the first, second, and third power inputs are configured to receive power from an alternating current (AC) power source. The controller also includes a microcontroller configured to generate a radio frequency (RF) signal in each of the first, second, and third power inputs. The controller further includes an RF based line sensing device configured to sense which one of said first, second, and third power inputs has received power from the AC power source based on the RF signal.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: June 26, 2018
    Assignee: Regal Beloit America, Inc.
    Inventors: Steven Albert Nardin, Michael R. Koller
  • Patent number: 9998058
    Abstract: In a control apparatus for an AC motor, a voltage waveform specifying unit of an inverter control unit specifies a voltage waveform for operating the inverter, based on a voltage vector calculated by a voltage command calculation unit. A spectrum amplitude extraction unit acquires values of bus current of the inverter and extracts the spectrum amplitude of the specific frequency that corresponds to the LC resonance frequency of the converter. A boost/non-boost state judgement unit of a converter control unit determines whether the state required by the converter in the next control cycle is the boost state or the non-boost state. When the spectrum amplitude of the specific frequency, correlated with the voltage waveform, is higher than the judgement threshold value and the converter is in the non-boost state, a voltage command value alteration unit changes the voltage command reference value such that the converter transitions to the boost state.
    Type: Grant
    Filed: April 11, 2017
    Date of Patent: June 12, 2018
    Assignee: DENSO CORPORATION
    Inventor: Hidekazu Takahashi
  • Patent number: 9998038
    Abstract: A fan motor power-off automatic braking circuit includes an energy storage unit, a motor drive circuit, a control unit and a resistance unit connected with an input power. The energy storage unit is electrically connected with the motor drive circuit for receiving and storing an operation voltage. The motor drive circuit has multiple upper arm switch components, multiple lower arm switch components, a first drive unit and a second drive unit. The control unit is respectively electrically connected with the lower arm switch components and the first and second drive units. When the fan is powered off, the energy storage unit provides the operation voltage to the upper arm switch components to switch on the same, whereby the upper arm switch components and the motor winding form a closed loop to achieve braking effect.
    Type: Grant
    Filed: January 15, 2017
    Date of Patent: June 12, 2018
    Assignee: Asia Vital Components Co., Ltd.
    Inventors: Hu Zhang, Xi-Sheng Jiang