Voltage Patents (Class 361/33)
  • Patent number: 11043913
    Abstract: A controller apparatus for an electric power tool is provided where the electric power tool includes a battery and a DC brushless motor. The controller apparatus includes a current detector that detects an instantaneous current flowing in the DC brushless motor; a current calculator that calculates one of an average value and an effective value of the instantaneous current detected by the current detector; a current controller configured to utilize a result from the current calculator as a detected value; and a speed controller configured to generate a target value of the current controller. The controller apparatus further includes a limiter that limits the target value of the current controller, where the limiter is provided at an output stage of the speed controller.
    Type: Grant
    Filed: April 17, 2018
    Date of Patent: June 22, 2021
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventor: Fumiiki Yoneda
  • Patent number: 10840848
    Abstract: To provide a motor driver and a motor driving system which allow a reduction in power consumption of a heat exchanger provided in a power magnetics cabinet while keeping down manufacturing cost. A motor driver is accommodated in a power magnetics cabinet and drives a motor. The motor driver comprises: a storage unit that stores the quantity of heat generated independently of the value of a current I[Arms] caused to flow in the motor as a generated heat quantity a[W]; a current detection unit that detects the value of the current I[Arms] caused to flow in the motor; and a heat quantity calculation unit that calculates the quantity of heat P[W] released to the interior of the power magnetics cabinet by adding the heat quantity a[W] stored in the storage unit and a heat quantity q×K[W/Arms]×I[Arms] responsive to the value I[Arms] detected by the current detection unit.
    Type: Grant
    Filed: December 7, 2018
    Date of Patent: November 17, 2020
    Assignee: FANUC CORPORATION
    Inventors: Kai Fukuda, Ryou Matsuda
  • Patent number: 10514427
    Abstract: A method for detecting a reverse current in a switching structure supplying power to an inductive load, having at least one switch and linked to an electric power source and to a ground for a control phase in which the current from the source supplies power to the load in accordance with a given duty cycle and a freewheeling phase in which the induced current from the load is decreasing, the reverse current being liable to be created during a freewheeling phase following a high duty cycle in a previous control phase creating a counter-electromotive force (cemf). The cemf is approximated proportionally to the integration of the duty cycle (integ[Dut cycl]) as a function of time (t), the reverse current either being calculated as a function of the estimated cemf or a reversal of the current criterion being established.
    Type: Grant
    Filed: December 18, 2017
    Date of Patent: December 24, 2019
    Assignees: Continental Automotive France, Continental Automotive GmbH
    Inventor: Angelo Pasqualetto
  • Patent number: 10469020
    Abstract: A power conversion apparatus includes a power conversion circuit and a control unit. The power conversion circuit converts electric power supplied from a power supply and outputs the converted electric power. The control unit controls the power conversion circuit. The power conversion circuit has at least one phase that is configured as a parallel-connection phase in which two semiconductor elements are connected in parallel to each other in each of an upper arm connected to a high potential-side wiring of the power supply and a lower arm connected to a low potential-side wiring of the power supply. The control unit detects temperature information related to element temperatures of all of the plurality of semiconductor elements of a target arm that is either of the upper arm and the lower arm of the parallel-connection phase, and performs overheating protection control of the power conversion circuit based on the detected temperature information.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: November 5, 2019
    Assignees: DENSO CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tomohisa Sano, Yuu Yamahira, Yoshihito Mizuno
  • Patent number: 10230304
    Abstract: System and method for regulating a power conversion system. An example system controller for regulating a power conversion system includes a signal generator and a driving component. The signal generator is configured to receive a feedback signal associated with an output signal of a power conversion system and a current sensing signal associated with a primary current flowing through a primary winding of the power conversion system and generate a modulation signal based on at least information associated with the feedback signal and the current sensing signal. The driving component is configured to receive the modulation signal and output a drive signal to a switch based on at least information associated with the modulation signal.
    Type: Grant
    Filed: June 15, 2017
    Date of Patent: March 12, 2019
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Dongze Yang, Miao Li, Lieyi Fang
  • Patent number: 10036238
    Abstract: A hydraulic fracturing system includes a pump, an electrically powered motor for driving the pump, a trailer on which the pump and motor are mounted, and a transformer that steps down electricity for use by the motor. Electrical output from the transformer connects to a series of receptacles mounted onto a housing around the transformer. A similar set of receptacles is provided on the trailer and which are electrically connected to the motor. Power cables equipped with plugs on their opposing ends insert into the receptacles to close an electrical circuit between the transformer and pump.
    Type: Grant
    Filed: May 3, 2016
    Date of Patent: July 31, 2018
    Assignee: U.S. WELL SERVICES, LLC
    Inventor: Jared Oehring
  • Patent number: 9427294
    Abstract: An electrical appliance with a resonant motor for driving a vibratory component is provided that has a control unit for driving the resonant motor with a predetermined driving frequency and for measuring the motion-induced voltage of the resonant motor and for determining whether the measured voltage value coincides with a predetermined target voltage value or whether the measured voltage value has crossed over the predetermined target value. The control unit measures the motion-induced voltage at a predetermined time of measurement (tm) within a driving cycle.
    Type: Grant
    Filed: August 19, 2011
    Date of Patent: August 30, 2016
    Assignee: BRAUN GMBH
    Inventors: Torsten Klemm, Ingo Vetter, Uwe Jungnickel
  • Patent number: 9166476
    Abstract: A power supply circuit that includes a voltage conversion circuit (CONV) for outputting an output voltage to an output voltage terminal, the output voltage being stepped up or stepped down from an input voltage (VIN) presented to an input voltage terminal, an output capacitor (COUT) coupled to the output voltage terminal, and a charge extraction circuit for extracting the charge of the output capacitor (COUT). Quick response to overshoot of VOUT generated by a sudden reduction in load current (ILOAD) is afforded, and overshoot is minimized.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: October 20, 2015
    Assignee: Asahi Kasei Microdevices Corporation
    Inventor: Katsutomi Harada
  • Patent number: 9071188
    Abstract: A protective redundancy circuit is provided for a power tool having an electric motor. The protective redundant subsystem is comprised of: a motor switch coupled in series with the motor; a motor control module that controls the switching operation of the motor switch; and a protective control module that monitors switching operation of the motor switch and disables the power tool when the switching operation of the motor switch fails. In the context of an AC powered tool, the switching operation of the motor switch is correlated to and synchronized to the waveform of the AC input signal. During each cycle or half cycle, the motor control module introduces a delay period before closing the motor switch and the protective control module determines the operational status of the motor switch by measuring the voltage across the motor switch during the delay period.
    Type: Grant
    Filed: September 3, 2010
    Date of Patent: June 30, 2015
    Assignee: Black & Decker Inc.
    Inventors: John C. Vanko, Larry T. Albert, Michael K. Forster, Bhanuprasad V. Gorti, Jason K. Leh, Garrett P. McCormick, Samuel G. Woods, David R. Beers
  • Patent number: 9059584
    Abstract: A circuit arrangement for de-exciting an excitation winding of a synchronous machine in the event of a fault, including a control circuit for controlling a current flow through the excitation winding, it being possible to apply a positive control voltage to the excitation winding for excitation and a negative control voltage for rapid de-excitation, and including a protective circuit which is parallel-connected to the excitation winding and which does not permit a current flow over the protective circuit in the event of rapid de-excitation and which forms a current path for limiting the voltage and de-exciting the excitation winding if at least one connecting line between the control circuit and the excitation winding is interrupted.
    Type: Grant
    Filed: January 12, 2011
    Date of Patent: June 16, 2015
    Assignee: ROBERT BOSCH GMBH
    Inventors: Stefan Spannhake, Jochen Fassnacht, Hans-Peter Mueller
  • Publication number: 20150085403
    Abstract: An apparatus for controlling a high-power drive device external to a package of a motor drive circuit includes a motor drive circuit. The motor drive circuit includes a driver to control the high-power drive device based on a first reference voltage, a second reference voltage, and a control signal based on a received control signal. A fault circuit generates a failure indicator based on a voltage across terminals of the high-power drive device. A fault condition is based on the failure indicator. A first terminal coupled to the driver charges a node of the high-power drive device over a first length of time in response to an absence of the fault condition and a first level of the control signal. A second terminal coupled to the driver discharges the node over a second length of time different from the first length of time.
    Type: Application
    Filed: September 25, 2013
    Publication date: March 26, 2015
    Inventors: Paulo Santos, Tufan Karalar, Michael J. Mills, Ross Sabolcik, Rudye McGlothlin, Michael L. Duffy, András Vince Horvath
  • Patent number: 8964337
    Abstract: Systems and methods for monitoring excitation of a generator based on a faulty status of a generator breaker are provided. According to one embodiment, a system may include a controller and a processor communicatively coupled to the controller. The processor may be configured to receive, from a contact associated with a generator breaker, a reported status of the generator breaker, receive operational data associated with one or more parameters of a generator associated with the generator breaker, and correlate the reported status of the generator breaker and the operational data. Based on the correlation, the processor may establish an actual status of the generator breaker, and, based on the actual status, selectively modify a mode of excitation of the generator.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: February 24, 2015
    Assignee: General Electric Company
    Inventors: Abhinandan Sharma, Shashidhar Nibhanupudi, Sridhar Nedunsezian
  • Patent number: 8917486
    Abstract: A vibration generating apparatus with high yield, low cost, and can exhibit vibration tactile haptic effects even with variation in the natural frequency of a mechanical vibrator, including a damping system having a damping ratio ?<1 to support a mechanical vibrator to a fastening part, and a magnetizing unit generating a dynamic magnetic field to vibrate the mechanical vibrator by non-contact, the mechanical vibrator generating a beat vibration by making the frequency of a drive voltage applied to the magnetizing unit, from a drive start or middle of drive, to be a non-resonant frequency out of a damped natural frequency of the mechanical vibrator, wherein the apparatus comprises a forced vibration control unit controlling to stop application of the drive voltage, in a beat wave defining an amplitude of the beat vibration, at a second valley part after a first peak part from the side of the drive start.
    Type: Grant
    Filed: July 26, 2011
    Date of Patent: December 23, 2014
    Assignee: Nidec Seimitsu Corporation
    Inventor: Miyazaki Masahiko
  • Patent number: 8861145
    Abstract: A suppression circuit may be added to a motor driver circuit, which suppresses offset voltage and ringing in the output signal. The suppression circuit may include an RC circuit filter connected to a pin of a microchip providing a gating reference signal and a junction between high and low side MOSFETS connected to the microchip.
    Type: Grant
    Filed: July 19, 2012
    Date of Patent: October 14, 2014
    Assignee: Honeywell International Inc.
    Inventors: Joseph Marotta, Dale Trumbo, Nasrullah Habeeb M, Rajamohan Revindranathan
  • Publication number: 20140268433
    Abstract: A compressor is provided and includes a single-phase electric motor and a protector device. The electric motor drives a compression mechanism and has a rotor and a stator. The stator is comprised of aluminum windings. The protector device is attached to the stator and is configured to disconnect the electric motor from a power supply when an input voltage of the power supply to the electric motor is less than a threshold voltage value set at a level between a minimum run voltage and an overheat voltage of the compressor. The overheat voltage corresponds to an overheat temperature of the electric motor. The threshold voltage value is set at a level that is between the minimum run voltage and the overheat voltage. The protector device includes a tolerance level such that the threshold voltage minus the tolerance level is greater than the overheat voltage and the threshold voltage plus the tolerance level is less than the minimum run voltage.
    Type: Application
    Filed: February 28, 2014
    Publication date: September 18, 2014
    Applicant: Emerson Climate Technologies, Inc.
    Inventors: Jefferson B. Johnson, Jeffrey John Hoying, Anthony P. Motz
  • Publication number: 20140247524
    Abstract: A method includes receiving N power signals, each having a different one of N phases, over N power supply lines, where N is an integer greater than two. The method further includes selectively activating a first switch to allow a first current to flow from a first one of the N power supply lines to a second one of the N power supply lines. The method includes generating a signal based on the first current, and selectively generating a phase failure signal when the signal is less than a predetermined threshold.
    Type: Application
    Filed: May 12, 2014
    Publication date: September 4, 2014
    Applicant: Emerson Climate Technologies, Inc.
    Inventors: Yunfeng WU, Yongbing WANG
  • Publication number: 20140218828
    Abstract: A power-protection apparatus is provided.
    Type: Application
    Filed: September 10, 2013
    Publication date: August 7, 2014
    Applicant: Delta Electronics, Inc.
    Inventors: Che-Hung LIN, Yueh-Lung HUANG, Yen-Hung CHEN
  • Patent number: 8716967
    Abstract: A motor control device for controlling a three-phase brushless motor that has a rotor and field coils includes: a load range determining unit that determines a rotor rotation angle range, in which the three-phase brushless motor becomes a load, as a load range when a short-circuit fault occurs in one of a plurality of switching elements. The load range determining unit determines a rotor rotation angle range, in which load current is presumed to flow through a closed circuit formed of the short-circuit switching element and any one of regenerative diodes connected in parallel with the respective normal switching elements when the rotor is rotated in a state where all the switching elements other than the short-circuit switching element are turned off, as the load range.
    Type: Grant
    Filed: March 24, 2011
    Date of Patent: May 6, 2014
    Assignee: JTEKT Corporation
    Inventor: Shigekazu Okumura
  • Publication number: 20140118867
    Abstract: Protection of a motor controller from a transient voltage and/or an over-voltage condition is described. A drive circuit includes a rectifier portion and at least one inductive device coupled to the rectifier portion. The drive circuit further includes at least one voltage clamping device coupled in parallel with the at least one inductive device, and at least one switching device configured to open as a function of a direct current (DC) link voltage value.
    Type: Application
    Filed: October 25, 2012
    Publication date: May 1, 2014
    Applicant: Regal Beloit America, Inc.
    Inventors: Roger Carlos Becerra, Yao Da, David Allen Clendenen
  • Publication number: 20140111890
    Abstract: A bi-directional electrostatic discharge (ESD) protection device may include a substrate, an N+ doped buried layer, an N-type well region and two P-type well regions. The N+ doped buried layer may be disposed proximate to the substrate. The N-type well region may encompass the two P-type well regions such that a portion of the N-type well region is interposed between the two P-type well regions. The P-type well regions may be disposed proximate to the N+ doped buried layer and comprise one or more N+ doped plates and one or more P+ doped plates.
    Type: Application
    Filed: October 19, 2012
    Publication date: April 24, 2014
    Applicant: MACRONIX INTERNATIONAL CO., LTD.
    Inventors: Hsin-Liang Chen, Shuo-Lun Tu
  • Publication number: 20140022676
    Abstract: A suppression circuit may be added to a motor driver circuit, which suppresses offset voltage and ringing in the output signal. The suppression circuit may include an RC circuit filter connected to a pin of a microchip providing a gating reference signal and a junction between high and low side MOSFETS connected to the microchip.
    Type: Application
    Filed: July 19, 2012
    Publication date: January 23, 2014
    Applicant: HONEYWELL INTERNATIONAL INC.
    Inventors: JOSEPH MAROTTA, DALE TRUMBO, NASRULLAH HABEEB M, RAJAMOHAN REVINDRANATHAN
  • Publication number: 20130277138
    Abstract: A motor drive apparatus includes a back EMF detection element and a protection control circuit. When a voltage detected by the back EMF detection element exceeds a threshold voltage of a Zener diode, a voltage signal is applied to a sensing gate through a detection signal line to sequentially turn on switching element of the low-side arm. A current caused by the back EMF applied to a drive circuit flows to the ground through the switching element of the low-side arm in an on-state. Thus a braking torque is applied to a motor, which is driven to rotate by an external force, and hence the back EMF is reduced. Switching elements in the drive circuit are thus protected from the excessive voltage.
    Type: Application
    Filed: April 10, 2013
    Publication date: October 24, 2013
    Applicant: Denso Corporation
    Inventors: Kanta ARAI, Toshihisa YAMAMOTO
  • Publication number: 20130271881
    Abstract: The invention relates to a protective circuit (10) in a screen wiper drive (1), consisting of a parallel circuit having two circuit elements (16, 17), wherein one circuit element (16) consists of a capacitor (18) and the other circuit element (17) consists of a series-connection of a diode (19) and a Zener diode (20), wherein the forward direction of the diode (19) and the Zener diode (20) is different and the Zener diode (20) inhibits in the direction of a plus pole.
    Type: Application
    Filed: December 8, 2011
    Publication date: October 17, 2013
    Applicant: VALEO SYSTEMES D'ESSUYAGE
    Inventors: Marco Rommel, Peter Kiersten, Armin Schubert
  • Patent number: 8502485
    Abstract: A motor drive circuit includes a positive and a negative supply rail for connection to a battery (104), a motor drive circuit including a plurality of motor drive subcircuits which each selectively permit current to flow into or out of a respective phase of a multi-phase motor (101) in response to control signals from a motor control circuit, and a switching means including at least one switch which is in series with a respective phase of the motor which is normally closed to permit the flow of current to and from the subcircuit to the respective motor phase. A fault signal detecting means (160) detects at least one fault condition and, in the event of a fault condition being detected, causes the at least one switch to open. A snubber circuit (150) is associated with the motor and is arranged so that following the opening of the switch, energy stored in the motor windings is diverted away from the switching means through the snubber circuit to the battery.
    Type: Grant
    Filed: April 7, 2010
    Date of Patent: August 6, 2013
    Assignee: TRW Automotive US LLC
    Inventors: Maciej Kudanowski, Andrew McLean
  • Patent number: 8462470
    Abstract: An automatic power-off and actuation circuit for a fan comprises a drive unit, a detection unit, a voltage-modulating unit, a comparison unit, an auto-restart unit, a regulation unit and a controlled IC, wherein the detection unit is electrically connected to the drive unit, the voltage-modulating unit is electrically connected to the detection unit, the comparison unit is electrically connected to the voltage-modulating unit, the auto-restart unit is electrically connected to the comparison unit, the regulation unit is electrically connected to the auto-restart unit and the drive unit, and the controlled IC is electrically connected to the regulation unit and the drive unit.
    Type: Grant
    Filed: August 6, 2010
    Date of Patent: June 11, 2013
    Assignee: ADDA Corp.
    Inventors: Ching-Cheng Ma, Ting-Cheng Lan
  • Publication number: 20130128394
    Abstract: A circuit arrangement for de-exciting an excitation winding of a synchronous machine in the event of a fault, including a control circuit for controlling a current flow through the excitation winding, it being possible to apply a positive control voltage to the excitation winding for excitation and a negative control voltage for rapid de-excitation, and including a protective circuit which is parallel-connected to the excitation winding and which does not permit a current flow over the protective circuit in the event of rapid de-excitation and which forms a current path for limiting the voltage and de-exciting the excitation winding if at least one connecting line between the control circuit and the excitation winding is interrupted.
    Type: Application
    Filed: January 12, 2011
    Publication date: May 23, 2013
    Inventors: Stefan Spannhake, Jochen Fassnacht, Hans-Peter Mueller
  • Publication number: 20130107401
    Abstract: A method is provided for controlling operation of an air conditioning unit. The method comprises supplying line voltage to activate a motor configured to operate the air conditioning unit, and monitoring a supply of control voltage in order to control operation of the air conditioning unit, the supply of control voltage being derived from line voltage. In response to detecting a control voltage below a predetermined threshold and/or by a predetermined percentage, a time delay is initiated. The method further comprises deactivating the motor if a predetermined increase in control voltage is not detected before the time delay expires.
    Type: Application
    Filed: October 31, 2011
    Publication date: May 2, 2013
    Applicant: TRANE INTERNATIONAL INC.
    Inventor: Robert W. Helt
  • Publication number: 20130088799
    Abstract: The motor monitoring system of the present disclosure uses several calculated monitoring values to determine a status of a motor and take a predetermined action when a threshold corresponding with the monitoring value is exceeded. The threshold may be calculated by an intelligent electronic device (IED) monitoring the motor. The predetermined action may include further monitoring of the motor. The predetermined action may include monitoring equipment not directly monitored by the IED.
    Type: Application
    Filed: October 4, 2012
    Publication date: April 11, 2013
    Applicant: SCHWEITZER ENGINEERING LABORATORIES, INC.
    Inventor: Schweitzer Engineering Laboratories, Inc.
  • Patent number: 8412432
    Abstract: A protective circuit arranged on a Printed Circuit Board (PCB) has two conductor loops. At least one supply voltage track, at least one semiconductor switch and at least one control component are arranged on the PCB. A first terminal of the control component and a first terminal of the semiconductor switch are connected electrically. A first conductor loop of the protective circuit is arranged on the PCB so that it surrounds an electrically conducting connection between the supply voltage track and the semiconductor switch and/or the control component. A second conductor loop is arranged on the PCB so that it surrounds the electrically conducting connection between the first terminal of the control component and the first terminal of the semiconductor switch, and thereby screens the same from the semiconductor switch and at least from those regions of the control component that are also connected to the supply voltage track.
    Type: Grant
    Filed: April 15, 2009
    Date of Patent: April 2, 2013
    Assignee: Lucas Automotive GmbH
    Inventors: Matthias Fuchs, Marco Junglas, Lutz Muders, Benedikt Ohlig
  • Patent number: 8354813
    Abstract: A torque limit section that applies limit to a torque instruction value of an electric motor such that a switching elements temperature is restricted to no more than an element upper limiting temperature includes a torque restriction section that finds a torque restriction value for restricting the torque of the electric motor in accordance with the said switching elements temperature; a torque restriction mitigation section that finds a torque restriction mitigation value for mitigating the torque limit value in accordance with the integrated value of the deviation of the element upper limiting temperature and the switching elements temperature; a first subtractor that finds a torque restriction value by subtracting the torque restriction mitigation value from the torque limit value; and a second subtractor that finds a limited torque instruction value obtained by subtracting the torque limit value from the torque instruction value and outputs this to the gate generating section.
    Type: Grant
    Filed: December 10, 2008
    Date of Patent: January 15, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Ryuta Hasegawa, Ryuichi Morikawa, Toshiharu Oobu
  • Patent number: 8334670
    Abstract: An electric motor control circuit includes an electric energy storage device electrically connected via DC power buses to an inverter circuit that connects via an alternating current circuit to an electric machine. A capacitive shunt circuit connects between the power buses. Current flow through the capacitive shunt circuit to the chassis ground is monitored. A fault is identified when the current flow through the capacitive shunt circuit to the chassis ground exceeds a threshold.
    Type: Grant
    Filed: March 25, 2010
    Date of Patent: December 18, 2012
    Assignee: GM Global Technology Operations LLC
    Inventor: John William Meyer, III
  • Patent number: 8264280
    Abstract: Detection accuracy of a short circuit state in a load driving circuit is improved thereby operation efficiency of a motor may be enhanced. A gate control circuit 25 turns off NMOS transistors Q1 and Q4, turns on an NMOS transistor Q3, and turns on and off an NMOS transistor Q2 intermittently so as to control rotation of a motor 10. A detection circuit 30a detects a voltage Va at a connection node a between the NMOS transistor Q2 and the motor 10 a predetermined time after the NMOS transistor Q2 is turned on. A control circuit 20 turns off the NMOS transistor Q2 so as to cut off a current from a power supply to the motor 10 if the voltage Va at the connection node a is within a range in which the motor 10 is determined to be short-circuited.
    Type: Grant
    Filed: July 7, 2009
    Date of Patent: September 11, 2012
    Assignee: Renesas Electronics Corporation
    Inventor: Koichiro Oku
  • Patent number: 8169174
    Abstract: In a steering control unit, a U-phase feed line branches into paired branch feed lines, phase-open MOSFETs are provided in middle portions of the branch feed lines, phase-open MOSFETs are provided in middle portions of a V-phase feed line and a W-phase feed line, and the phase-open MOSFETs are arranged in such a manner that parasitic diodes are in the same orientation with respect to a motor. When an abnormality occurs, all the phase-open MOSFETs are turned off. Then, a closed circuit, which includes phase coils and through which electric currents flow, is no longer present.
    Type: Grant
    Filed: September 21, 2009
    Date of Patent: May 1, 2012
    Assignee: JTEKT Corporation
    Inventor: Yoshiyuki Shibata
  • Patent number: 8169177
    Abstract: An electric vehicle includes a control unit having overcurrent generation judgment unit, inverter selection unit, and inverter drive control unit. The overcurrent generation judgment unit judges whether an overcurrent is generated in an inverter for generation or an inverter for travel. When an overcurrent is generated in one of the inverters, the inverter selection unit selects the other inverter to be driven. The inverter drive control unit stops the driving of the one inverter and drives the other inverter to drive a travel motor or a generator.
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: May 1, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Takeshi Kishimoto
  • Patent number: 8159111
    Abstract: A driving device includes a motor, a clutch gear, a first rotating portion, a second rotating portion, a piezoelectric assembly, and a controlling unit. The motor includes a rotating shaft. The clutch gear is fixed to the rotating shaft. The first rotating portion sleeved on the rotating shaft includes a first end meshing with the clutch gear and a second end opposite to the first end. The second rotating portion is engaged with the second end. The piezoelectric assembly is sandwiched between the second end and the second rotating portion. The controlling unit is electrically connected to the motor and the piezoelectric assembly. The controlling unit is configured for storing a predetermined voltage, and determining whether a voltage output by the piezoelectric assembly equals to or exceeds the predetermined voltage. A protection method for the driving device is also provided.
    Type: Grant
    Filed: May 19, 2009
    Date of Patent: April 17, 2012
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventor: Song-Ling Yang
  • Patent number: 8154240
    Abstract: A control apparatus for an electric railcar includes an inverter that exchanges power with an AC rotating machine, a filter capacitor connected in parallel to a DC side of the inverter, a filter reactor provided between the filter capacitor and an overhead line, an overhead line voltage measuring instrument that measures a voltage value of the overhead line, a voltage increase detection unit that senses an amount of voltage increase occurring when, with an overhead line voltage being supplied, the overhead line voltage goes beyond a reference voltage value and rises at a rate equal to or higher than that by a predetermined time constant.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: April 10, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hideto Negoro, Masaki Kono
  • Patent number: 8144439
    Abstract: A method and a circuit are provided for the commutation of brushless direct-current motors (BLDC motors), without using sensors, and especially to a method and a circuit for producing rotor position signals, without using sensors, for the commutation of brushless direct-current motors. In the method and the circuit Hall sensor signals are emulated without sensors and rotor position signals free of disturbing pulses and with a correct phase position are generated from said signals. The rotor position signals can be used to carry out a reliable, sensor-free commutation.
    Type: Grant
    Filed: November 30, 2008
    Date of Patent: March 27, 2012
    Assignee: Trinamic Motion Control GmbH & Co. KG
    Inventors: Lars Larsson, Bernhard Dwersteg
  • Patent number: 8144438
    Abstract: A motor control center communication system configured to interface with a communication network. The system includes a plurality of motor control units (MCUs), and a MCU controller configured to transmit and receive data signals via the communication network to and from, the plurality of MCUs. Each of the plurality of MCUs includes a magnetic contactor having electrical contacts operable between open and closed positions, and a local control module operatively connected to the associated magnetic contactor and to the MCU controller, and configured to monitor a status of the electrical contacts, transmit the monitored status information to the MCU controller, and actuate the associated magnetic contactor based on data signals received from the MCU controller.
    Type: Grant
    Filed: October 3, 2008
    Date of Patent: March 27, 2012
    Assignee: General Electric Company
    Inventors: Cecil Rivers, Jr., Thomas Frederick Papallo, Jr.
  • Patent number: 8130478
    Abstract: A power limiting system for multiple electric motors includes an electrical power generating component, such as an alternator, and a plurality of motor controllers connected to an electrical bus. Each motor controller compares the voltage on the bus to a specified minimum voltage and a specified maximum voltage, and reduces its electric power output if the voltage on the bus is less than the maximum voltage while continuing to operate the electric motors.
    Type: Grant
    Filed: April 7, 2009
    Date of Patent: March 6, 2012
    Assignee: Deere & Company
    Inventors: Clement Vanden Godbold, Patrick Wilson Cross
  • Patent number: 8125179
    Abstract: A motor control circuit (MC) comprising input terminals (IT1, IT2) to receive a rectified input voltage (Vrm), and output terminals (OT1, OT2) to supply a motor drive signal (Vm). A switching circuit (1) is alternately in an on-state (Ton) and an off-state (Toff) for intermittently coupling the input terminals (IT1, IT2) to the output terminals (OT1, OT2). A controller (2) controls the switching circuit (1) to be (i) in the on-state (Ton) during a first period in time (T1) when an amount of magnetic saturation of the motor is smaller than a predetermined value, and (ii) alternately in the on-state (Ton) and the off-state (Toff) to obtain a pulse width control of the motor drive signal (Vm) during a second period in time (T2) when the amount of magnetic saturation of the motor is larger than the predetermined value.
    Type: Grant
    Filed: March 6, 2008
    Date of Patent: February 28, 2012
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Wessel Adolf Otten, Wilhelmus Ettes
  • Patent number: 8085514
    Abstract: A modular control assembly is provided for on-machine control of a desired machine. One embodiment has a machine mountable base and a replaceable control unit, wherein the machine mountable base has a machine protection device. In various embodiments of the machine mountable base, the machine protection device may have a short-circuit protective device and a disconnect device. In addition, various embodiments of the replaceable control unit may have a variable frequency drive, a soft start device, or an adjustable overload protection device.
    Type: Grant
    Filed: November 19, 2003
    Date of Patent: December 27, 2011
    Assignee: Rockwell Automation Technologies, Inc.
    Inventor: Brian J. Taylor
  • Patent number: 8072170
    Abstract: The present invention relates to a motor controller for air conditioner including a converter having at least one switching element for converter, the converter converting AC utility power into DC power by a switching operation of the switching element; an inverter having at least one switching element for inverter, the inverter converting the DC power into prescribed AC power by a switching operation of the switching element and driving a three-phase motor; a microcomputer outputting a converter switching control signal that controls the switching element for converter; and a dc terminal signal generator detecting a dc terminal voltage that is applied across an dc terminal of the converter to sequentially generate a pulse type dc terminal signal, and insulating the dc terminal from the microcomputer. The present invention may sequentially generate a dc terminal signal and simultaneously insulate the dc terminal from the microcomputer, thus making it possible to improve the stability of the motor controller.
    Type: Grant
    Filed: November 19, 2008
    Date of Patent: December 6, 2011
    Assignee: LG Electronics Inc.
    Inventors: Sun Ho Hwang, Han Su Jung, Chung Hun Lee
  • Patent number: 8044624
    Abstract: A load control apparatus outputs a PWM signal to a switching element to control a load. The switching element is connected between a power supply and a grand in series with the load. An abnormal increase detecting unit outputs an abnormal increase detection signal when detecting abnormal increase in applied voltage, which is applied to the load, relative to target voltage. An abnormal decrease detecting unit outputs an abnormal decrease detection signal when detecting abnormal decrease in the applied voltage relative to the target voltage. An operating state monitoring unit outputs a normally operating signal when the load normally operates. A signal combining unit generates a combined signal by combining the abnormal increase detection signal, the abnormal decrease detection signal, and the normally operating signal and outputs the combined signal via a common signal output terminal.
    Type: Grant
    Filed: May 15, 2008
    Date of Patent: October 25, 2011
    Assignee: DENSO CORPORATION
    Inventors: Yosuke Matsuo, Shigeru Takeuchi, Taketoshi Sato
  • Patent number: 8030862
    Abstract: A method for applying power to an electronically commutated motor (ECM) is described. The method includes connecting an AC voltage source to an input of a rectification circuit, connecting a DC voltage source to an output of the rectification circuit, and electrically connecting the DC voltage source and rectification circuit output to operational components of the ECM. The DC voltage source is capable of providing a voltage equal to or greater than a rectified voltage originating from the AC voltage source, and the DC voltage source is connected in parallel with the output of the rectification circuit.
    Type: Grant
    Filed: March 8, 2007
    Date of Patent: October 4, 2011
    Assignee: RBC Manufacturing Corporation
    Inventor: William A. Archer
  • Publication number: 20110235218
    Abstract: A control circuit has an input terminal for receiving an input voltage, an energy accumulator for storing electric energy from the input terminal and supplying power to an electrical load, and an over-voltage protection unit for lowering the voltage at the input terminal when the voltage at an output terminal of the energy accumulator exceeds a predetermined threshold value. A motor device combines the control circuit with an electric motor as the load.
    Type: Application
    Filed: March 25, 2011
    Publication date: September 29, 2011
    Inventors: EN HUI WANG, FEI XIN, CHI PING SUN, MING LI ZHANG
  • Patent number: 8027130
    Abstract: A fan system is electrically connected to a power source, and the fan system includes a power reverse protection apparatus, a voltage regulator, a driver, and a fan. The power reverse protection apparatus, electrically connected to the power source, includes a voltage regulator switch and an activating device. The voltage regulator switch receives an input signal and outputs a first output signal according to the input signal. The activating device is electrically connected to the power source and the voltage regulator switch for receiving the input signal and the first output signal, respectively. The activating device outputs a second output signal to the fan according to the first output signal. The voltage regulator is electrically connected to the power source for receiving the input signal from the power source and outputting a regulating signal according to the input signal.
    Type: Grant
    Filed: October 23, 2008
    Date of Patent: September 27, 2011
    Assignee: Delta Electronics, Inc.
    Inventors: Wei-Long Tai, Chien-Hua Chen
  • Patent number: 8018696
    Abstract: A system for moving an aircraft thrust reverser component includes a power drive unit, a thrust reverser actuator assembly, and a tertiary lock system. The power drive unit is operable to rotate and supply a rotational drive force. The thrust reverser actuator assembly receives the rotational drive force from the power drive unit and moves the thrust reverser component between a stowed position and a deployed position. The tertiary lock system selectively engages and disengages the thrust reverser component and includes a tertiary lock power unit, an electromechanical tertiary lock assembly, and a voltage limiting circuit. The voltage limiting circuit limits the voltage magnitude of a control signal supplied to the tertiary lock assembly to a predetermined value.
    Type: Grant
    Filed: May 5, 2008
    Date of Patent: September 13, 2011
    Assignee: Honeywell International Inc.
    Inventor: Terry L. Ahrendt
  • Publication number: 20110188158
    Abstract: It is presented a protection circuit for a drive circuit of a permanent magnet motor being powered by a main DC source. The protection circuit comprises a protection circuit DC source; a changeover switch being arranged to select an input to a gate of a main drive switch of the drive circuit, the input being selectable between an output of the protection circuit DC source and a second control signal; and a changeover control device connected to control the changeover switch, which changeover control device is arranged to ensure that the changeover switch is connected to the output of the second side of the protection circuit DC source when an overvoltage is detected.
    Type: Application
    Filed: February 3, 2011
    Publication date: August 4, 2011
    Applicant: Danaher Motion Stockholm AB
    Inventors: Thord Agne Gustap Nilson, Miroslaw Hrywniak
  • Patent number: 7954334
    Abstract: An inverter system having a semiconductor device, and a railway vehicle using this inverter, provide a more accurate determination of whether an abnormal heat generation from the inverter is associated with an error of the inverter system or is due to other causes, by use of a plurality of temperature detecting elements at a plurality of sites associated with the semiconductor device. An error detection section applies inputs from the temperature detecting elements, captures a trend of the differential value based on the plurality of temperature inputs using period sampling wherein an error associated with the semiconductor device, and not from some other condition such as outside environment temperature, is determined based on differences from, or a change in, the initial trend.
    Type: Grant
    Filed: August 18, 2004
    Date of Patent: June 7, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Masataka Sasaki, Hideki Miyazaki, Katsumi Ishikawa, Keiji Maekawa
  • Publication number: 20110110002
    Abstract: An electric power supply device capable of miniaturizing an FET and wiring and reducing the amount of heat generation even when a motor load goes into a lock state is provided. It is determined whether or not a lock current flows in a motor M1 by comparing various determination voltages with a voltage Vds between a drain and a source of a MOSFET (T1), and in the case of detecting that the lock current flows, an operation of turning off the MOSFET (T1) until a retry cycle to elapses after turning on the MOSFET (T1) for only energization time tb for which lock torque can be caused is repeatedly executed. Then, when a motor current ID becomes smaller than the lock current, control of returning the MOSFET (T1) to a normal operation is performed. Consequently, the lock current can be prevented from flowing continuously.
    Type: Application
    Filed: January 16, 2009
    Publication date: May 12, 2011
    Applicant: YAZAKI CORPORATION
    Inventor: Shunzou Ooshima