Patents Examined by Rita Leykin
  • Patent number: 10069444
    Abstract: A motor control apparatus includes a PWM rectifier which converts AC power on a three-phase AC input power supply side into DC power or which converts DC power on a DC output side into AC power, a smoothing capacitor which is connected to a DC link on the DC output side of the PWM rectifier, a DC voltage detection unit which detects a DC voltage of the smoothing capacitor, an LCL filter which is connected to the AC input power supply side of the PWM rectifier, a power disconnection unit which is connected to an AC power supply side of the LCL filter, and a control unit which applies, when power is disconnected by the power disconnection unit, electric current to the LCL filter by controlling the PWM rectifier, and lowers the DC voltage to a desired value by discharging energy stored in the smoothing capacitor.
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: September 4, 2018
    Assignee: FANUC CORPORATION
    Inventor: Masakazu Niwa
  • Patent number: 9966885
    Abstract: A method for calibrating a motor, the motor comprising a permanent magnet synchronous motor, is provided. The method generates a rotating magnetic field using a voltage vector, the rotating magnetic field configured to rotate at a constant angular velocity independent of an actual rotor position, and the rotating magnetic field rotating in a first direction; identifies, by a processor, timing data associated with a plurality of digital Hall effect sensors; computes, by the processor, accurate positions for each of the plurality of digital Hall effect sensors, using the timing data and the constant angular velocity; creates a reference table in system memory, by the processor, the reference table comprising the accurate positions; and during operation of the motor, calculates accurate angular velocity values for the motor, using the reference table.
    Type: Grant
    Filed: June 14, 2017
    Date of Patent: May 8, 2018
    Assignee: HONEYWELL INTERNATIONAL INC.
    Inventors: Ron Strong, Thom Kreider
  • Patent number: 9966895
    Abstract: A method for controlling a trolling motor including a sonar transducer and an electric motor rotating a propeller includes providing a motor controller configured for electrical connection to the electric motor. The motor controller includes a pulse width modulator outputting a PWM signal. A high-side electronic switch is provided between a high-side output of the pulse width modulator and the electric motor and a low-side electronic switch is provided between a low-side output of the pulse width modulator and the electric motor. The electric motor is driven by current transmitted via the high-side electronic switch or the low-side electronic switch in response to the PWM signal. An operating frequency of the PWM signal is selected such that an operating frequency of the sonar transducer is approximately centered between harmonic frequencies of the PWM signal. A spread spectrum switching algorithm reduces a peak noise level of the PWM signal.
    Type: Grant
    Filed: June 14, 2017
    Date of Patent: May 8, 2018
    Assignee: Brunswick Corporation
    Inventor: Eric S. Deuel
  • Patent number: 9954473
    Abstract: The present invention relates to a motor driving apparatus and a home appliance including the same. A motor driving apparatus according to an embodiment of the present invention includes an inverter for converting a DC voltage of a DC-link capacitor into an AC voltage according to a switching operation and outputting the converted AC voltage to a motor; a DC-link resistor disposed between the DC-link capacitor and the inverter; and a controller for controlling the inverter based on a phase current sampled through the DC-link resistor, wherein the controller estimates a phase current based on the phase current sampled through the DC link resistor, in an interval in which phase current detection is not possible. Thereby, the phase current flowing through the motor may be accurately calculated using the DC link resistor.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: April 24, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Jungmoon Je, Hansu Jung, Chungill Lee, Jangmok Kim, Hyunkeun Ku, Hanbeom Yeom
  • Patent number: 9948215
    Abstract: Starter system for an electric motor (M) supplied by an electrical network (1), the starter system comprising an electronic control circuit (7) and an electronic switch (10) for controlling one phase of the motor (M), the electronic switch (10) being controlled by the control circuit (7). The starter system comprises a sensor (3) intended to deliver an analog signal (4) that is representative of the derivative of a current flowing through the phase of the motor (M), a detection board (5) comprising means for transforming said analog signal (4) into a binary signal (6) that is representative of the changes in sign of said analog signal, and comprising means for transmitting said binary signal to the control circuit (7), so as to optimize the control of the electronic switch (10).
    Type: Grant
    Filed: July 5, 2016
    Date of Patent: April 17, 2018
    Assignee: SCHNEIDER ELECTRIC INDUSTRIES SAS
    Inventors: Alain Dentella, Delcho Penkov
  • Patent number: 9941688
    Abstract: A method of operating a refrigeration system that receives power from an electrical grid includes selectively operating at least one component of the refrigeration system in a first state. The method includes selectively detecting a fault event of the electrical grid in response to a concurrent (i) increase in amount of current drawn by the component and (ii) decrease in voltage of power received by the component. The method includes, in response to detecting the fault event, switching the component from the first state to a second state. The component consumes less power in the second state than in the first state. The method includes determining a first delay period. The method includes identifying a conclusion of the fault event. The method includes, in response to the conclusion of the fault event, waiting for the first delay period before switching the component back to the first state.
    Type: Grant
    Filed: October 17, 2016
    Date of Patent: April 10, 2018
    Assignee: Emerson Climate Technologies, Inc.
    Inventors: Nagaraj Jayanth, George Ramayya
  • Patent number: 9941831
    Abstract: A control system for a switched reluctance (SR) motor includes a Direct Current (DC) power source, and an inverter. The control system includes a user interface configured to enable an operator to specify a desired torque output. The control system further includes a controller which converts a DC current from the Alternating Current (AC) supplied to the SR motor by the inverter. The controller estimates an actual power output generated by the SR motor based on a DC voltage supplied by the DC power source to the inverter, and the converted DC current. The controller estimates an actual torque output based on the actual power output and a rotational speed of the SR motor. The controller compares the actual torque output and a desired torque output to calculate a torque error. The controller adjusts a torque output limit and the rotational speed of the SR motor.
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: April 10, 2018
    Assignee: Caterpillar Inc.
    Inventors: Jason L. Miller, Ernesto Inoa, Jesse Gerdes, Alexander C. Crosman, III, Carlos E. Nino-Baron, Thomas Michael Sopko, Jr., Jackson Wai, Ahmed Khalil
  • Patent number: 9923501
    Abstract: A motor includes a frame, a shaft rotatably mounted onto the frame, and at least one disc mounted onto the shaft. At least one permanent magnet is mounted on the disc, and at least one electromagnet and at least one coil are mounted to the frame in rotational magnetic proximity to the permanent magnet. A battery is connectable to the electromagnet and the coil for energizing the electromagnet and for receiving electrical current from the coil for charging the battery. A relay switch controls the transmission of electrical power from the battery to the electromagnet. A sensor generates a signal to the relay switch to activate electrical power to the electromagnet upon sensing that the permanent magnet is positioned with respect to the electromagnet such that a magnetic force generated by the electromagnet would be effective for inducing movement of the permanent magnet and consequent rotation of the disc.
    Type: Grant
    Filed: April 25, 2017
    Date of Patent: March 20, 2018
    Inventor: Clifford R. Rabal
  • Patent number: 9923493
    Abstract: A drive circuit for a synchronous motor including a rotor having ten magnetic poles formed by a permanent magnet, and a stator in which a winding is wound in a concentrated manner around nine teeth facing the rotor, the drive circuit including: an inverter including a plurality of switching elements in bridge connection; and a control unit that controls the inverter in such a manner that a square-wave-shaped current flows to the winding, wherein the control unit operates in such a manner that an energization phase at which to pass the square-wave-shaped current falls within a range of electric angles of ?10° to +5° from an energization phase at which the current is minimum when a target torque of the synchronous motor is generated.
    Type: Grant
    Filed: January 9, 2014
    Date of Patent: March 20, 2018
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Atsushi Matsuoka, Kazuhiko Baba, Hiroyuki Ishii
  • Patent number: 9917539
    Abstract: A control device includes: an induced voltage detection circuit that detects induced voltages which is generated in at least one coil of a brushless DC motor; a rotational position that detects the rotational position of a rotor of the brushless DC motor; an error correct circuit that calculates a first difference between a phase of the induced voltage detected by the induced voltage detection circuit and a phase of the rotational position detected by the rotational position detection circuit; a correction circuit that corrects the detected rotational position based on the first difference and outputs a corrected rotational position signal; and a drive signal generation circuit that adjusts a phase of a drive signal which is supplied to the brushless DC motor based on the corrected rotational position signal and generates the drive signal whose phase has been adjusted.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: March 13, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Naoki Omura
  • Patent number: 9906180
    Abstract: An electromechanical system includes an inverter drive, a component arranged during operation to generate a variable force having one or more periodic frequency components, and processing circuitry arranged to determine the power output of the inverter drive, measure a difference between the power output and a reference power output, and control an output frequency of the inverter drive as a function of the measured difference, so as to stabilise the power output during operation of the component. Other example electromechanical systems, inverter drives and methods are also disclosed.
    Type: Grant
    Filed: April 4, 2017
    Date of Patent: February 27, 2018
    Assignee: NIDEC CONTROL TECHNIQUES LIMITED
    Inventor: Colin Hargis
  • Patent number: 9899947
    Abstract: A control apparatus for a DC inverter electric motor comprising a control module and a controlled module is disclosed. The control module includes a phase-cut that continuously cut off a conduction angle of the AC power supply. The controlled module comprises a rectification circuit for rectifying the AC power supply after being cut off, a phase detection circuit for detecting the cut-off conduction angle, and a control unit for controlling the rotational speed or action of the motor according to the conduction angle that is detected by the phase detection circuit. The control apparatus makes use of the size of the conduction angle to act as control command and thus does not has the issue of reduced power factor. No complex or complicated circuits or wires have to be disposed and the functions can be achieved by making use of existing wiring. It is thus easy to install, cost-effective, and easy to maintain.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: February 20, 2018
    Assignee: Jaguar Precision Industry Co., Ltd.
    Inventor: Fei-Tyh Chuang
  • Patent number: 9889880
    Abstract: The motor control device includes plural motor current blocking units that, in blocking operation, individually block energization between plural motor driving circuits and multi-phase motor windings of a multi-phase electric motor and an abnormality detecting unit that detects a short-circuit failure of the motor current blocking units. The abnormality detecting unit causes one or more motor current blocking units of the plural motor current blocking units to perform a blocking operation during energization between the plural motor driving circuits and the multi-phase electric motor, and, during the blocking operation, detects a short-circuit failure of the motor current blocking units caused to perform the blocking operation based on current values of currents flowing to the plural motor driving circuits.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: February 13, 2018
    Assignee: NSK Ltd.
    Inventor: Kenji Mori
  • Patent number: 9893674
    Abstract: A motor control device includes: a power failure detection unit that detects a power failure; a voltage detection unit that detects a DC link voltage; a switch unit which connects a motor to an amplifier or a resistance; a voltage comparison unit which compares a DC link voltage with a threshold value; a limit value setting unit which sets a torque limit value in accordance with a result of comparison; a torque command limit unit which limits a torque command when a power failure is detected; a prediction value calculation unit which calculates, using an angular velocity, a torque prediction value of the motor when the motor is connected to the resistance; and a torque comparison unit which compares the torque limit value with the torque prediction value, in which in accordance with a result of comparison, the switch unit connects the motor to the amplifier or the resistance.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: February 13, 2018
    Assignee: FANUC CORPORATION
    Inventors: Satoshi Ikai, Yuuki Kumamoto
  • Patent number: 9881824
    Abstract: A transfer apparatus that includes a moving unit capable of moving with respect to a base and transferring an article with the moving unit protruding from the base. The transfer apparatus includes a movement regulation unit capable of switching between a first state in which the moving unit is restricted in a reference position and a second state in which the moving unit is allowed to move from the reference position to one of a first direction and a second direction opposite to the first direction and in which movement of the moving unit in the other direction is restricted.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: January 30, 2018
    Assignee: MURATA MACHINERY, LTD.
    Inventor: Junichi Ito
  • Patent number: 9882517
    Abstract: A method and a system for controlling a motor are provided to allow for a limp home function when an error occurs in a Hall effect sensor that detects the position of a rotor while operating a motor used for an automotive electric water pump. The method includes determining an output error of a Hall effect sensor and stopping adjustment a speed of the motor based on output of the Hall effect sensor, in response to detecting an output error of the Hall effect sensor. Additionally, the method includes adjusting the speed of the motor based on a counter electromotive force generated by a plurality of stator coils having different phases in the motor.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: January 30, 2018
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Dong Soo Shim, Jae Shin Yi, Byoung Hoon Choi, Yeon Ho Kim
  • Patent number: 9876346
    Abstract: A refrigerant compressor includes an electric motor. A current sensor measures current to the electric motor. A switching device is configured to close and open to allow and prevent current flow to the electric motor, respectively. A maximum continuous current (MCC) device generates an output that one of: (i) is an MCC for the electric motor and (ii) is a value indicative of the MCC for the electric motor. A motor protection module: is remote from the MCC device; receives the output wirelessly from the MCC device via an antenna; one of sets a first MCC to the MCC for the electric motor and determines the first MCC based on the value indicative of the MCC for the electric motor; selectively sets a predetermined MCC to the first MCC; and controls the switching device based on a comparison of the current to the electric motor and the predetermined MCC.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: January 23, 2018
    Assignee: Emerson Climate Technologies, Inc.
    Inventors: Frank S. Wallis, Joseph James Rozsnaki
  • Patent number: 9876449
    Abstract: A drive circuit for a synchronous motor including a rotor having ten magnetic poles formed by a permanent magnet, and a stator in which a winding is wound in a concentrated manner around nine teeth facing the rotor, the drive circuit including: an inverter including a plurality of switching elements in bridge connection; and a control unit that controls the inverter in such a manner that a square-wave-shaped current flows to the winding, wherein the control unit operates in such a manner that an energization phase at which to pass the square-wave-shaped current falls within a range of electric angles of ?10° to +5° from an energization phase at which the current is minimum when a target torque of the synchronous motor is generated.
    Type: Grant
    Filed: January 9, 2014
    Date of Patent: January 23, 2018
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Atsushi Matsuoka, Kazuhiko Baba, Hiroyuki Ishii
  • Patent number: 9871475
    Abstract: A PWM motor drive device includes: a time counter that counts a time of a polarity of a motor phase signal; a register that retains the time; a zone setting circuit that splits the time into arbitrary zones and generates an arbitrary zone set for which a phase of motor current is adjusted; and a zone correction circuit that compares a motor current phase signal indicating the phase of the motor current with the motor phase signal to correct the zone set.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: January 16, 2018
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Katsuyuki Tabata, Tomokazu Furuno, Masayoshi Igarashi, Shinichi Kuroshima
  • Patent number: 9856080
    Abstract: A trashcan assembly can include a body portion, a lid portion pivotably coupled with the body portion, and a sensor assembly configured to generate a signal when an object is detected within a sensing region. The sensor assembly can include a plurality of transmitters having a first subset of transmitters and a second subset of transmitters. A transmission axis of at least one transmitter in the first subset of transmitters can be different from a transmission axis of at least one of the transmitters in the second subset of transmitters. An electronic processor can generate an electronic signal to a power-operated drive mechanism for moving the lid portion from a closed position to an open position, such as in response to the sensor assembly detecting the object.
    Type: Grant
    Filed: September 14, 2016
    Date of Patent: January 2, 2018
    Assignee: simplehuman, LLC
    Inventors: Frank Yang, David Wolbert, Guy Cohen, Bryce Wilkins