Voltage Control Patents (Class 318/812)
  • Patent number: 10601358
    Abstract: A current command module is configured to, based on a motor torque request for an electric motor of the vehicle, generate a d-axis current command for the electric motor and a q-axis current command for the electric motor. A voltage command module is configured to generate voltage commands based on the d-axis current command and the q-axis current command. A switching control module is configured to: based on the d-axis current command and the q-axis current command, determine a first duty cycle command for a phase of the electric motor; generate a second duty cycle command based on the first duty cycle command, a predetermined minimum period to transition switches of an inverter module from OFF to ON, a predetermined switching period, a predetermined deadtime period when both of the switches are OFF before one of the switches is turned ON, and whether a current of the phase is positive.
    Type: Grant
    Filed: October 11, 2018
    Date of Patent: March 24, 2020
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Kibok Lee, Young Joo Lee
  • Patent number: 10550676
    Abstract: Systems and methods for determining proper phase rotation in a linear motor where the phase rotations associated with power and return strokes are initially unknown. Power having an initial phase rotation is provided to a linear motor until the motor's mover reaches the end of the stroke, and then power to the motor is discontinued. While power is discontinued, the mover is monitored to detect its movement. if the mover moves without power, the mover was at the top of the stroke, so the initial phase rotation is associated with an upward stroke of the mover, and a second phase rotation which is opposite the initial phase rotation is associated with a downward stroke of the mover. Otherwise, the initial phase rotation is associated with the downward stroke of the mover and the second, opposite phase rotation is associated with the upward stroke of the mover.
    Type: Grant
    Filed: April 25, 2016
    Date of Patent: February 4, 2020
    Assignee: BAKER HUGHES INCORPORATED
    Inventor: Renato L. Pichilingue
  • Patent number: 10396697
    Abstract: A motor operating system includes a parameter-setting module and a control circuit. The parameter-setting module generates a first parameter-setting corresponding to a first operating stage through a user interface, and determines whether a first operating status conforms to a first threshold setting. The control circuit is coupled to a motor, receives the first parameter-setting corresponding to the first operating status, drives the motor according to a first driving signal corresponding to the first parameter-setting, and outputs the first operating status corresponding to the first driving signal. When the first operating status does not conform the first threshold setting, the parameter-setting module generates an adjusted first parameter-setting. When the first operating status conforms the first threshold setting, the parameter-setting module sets the first parameter-setting as a first optimal parameter-setting.
    Type: Grant
    Filed: September 17, 2018
    Date of Patent: August 27, 2019
    Assignee: Princeton Technology Corporation
    Inventors: Wen-Jan Lee, Liao-Shun Cheng
  • Patent number: 10320313
    Abstract: An arc-free phase control circuit for an AC motor that brings about an energy saving effect according to a load change and operates efficiently in terms of cost reduction while securing electrical stability by virtue of an overload protection function. The circuit includes a first relay, a TRIAC, a second relay, a voltage sensing unit, a current sensing unit, a speed voltage sensing unit, a zero-cross point detection unit, and a controller.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: June 11, 2019
    Inventor: Young Jun Kim
  • Patent number: 10295599
    Abstract: A method in a motor controller for an electric motor is disclosed. The method includes receiving a motor current measurement, a motor reference voltage or measured voltage, and an estimated temperature from the electric motor, determining a reference flux linkage estimate (?pm,ref) from a lookup table based on the motor current measurement and the estimated temperature, determining a back-EMF (electromotive force) estimate based on the motor current measurement, the motor voltage and the estimated temperature, determining an observed flux linkage estimate (?pm,obs) from the back-EMF estimate, determining a magnetic strength as a ratio of the observed flux linkage estimate to the reference flux linkage estimate, and determining that a rotor magnet has been demagnetized to an unacceptable level when the magnetic strength is below a threshold level.
    Type: Grant
    Filed: August 11, 2017
    Date of Patent: May 21, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Gilsu Choi, Anno Yoo, Dwarakanath V. Simili
  • Patent number: 10230318
    Abstract: Disclosed embodiments relate to methods, apparatuses, and systems for estimating parameters of an induction machine. In some embodiments, a method for estimating parameter of an induction machine includes estimating parameters of the induction machine more accurately even when it is stationary by utilizing voltage equations of the induction machine and signal processing techniques, with no additional hardware.
    Type: Grant
    Filed: September 13, 2016
    Date of Patent: March 12, 2019
    Assignee: LSIS CO., LTD.
    Inventors: Anno Yoo, Yong-Doo Yoon
  • Patent number: 10017075
    Abstract: A control device for an electric vehicle improving the responsiveness of a motor and leading to improvement in occupant's riding comfort during power running and regenerative control of the motor. A motor control module includes: a current PI control section to perform PI feedback control to eliminate a deviation relative to a command current value generated in an inverter, in response to a torque command from an ECU; PI control gain adjustment tables, for power running and regenerative control, in which a PI control gain used when the current PI control section performs the PI feedback control is set in accordance with a running state; and a control gain adjustment section to adjust the PI control gain according to the PI control gain adjustment table such that a PI control gain corresponding to the running state is used.
    Type: Grant
    Filed: November 17, 2015
    Date of Patent: July 10, 2018
    Assignee: NTN CORPORATION
    Inventor: Guodong Li
  • Patent number: 10008967
    Abstract: A closed loop flux weakening method and apparatus are provided. The closed loop flux weakening apparatus may include a difference circuit that obtains a difference between a q-axis reference voltage and a q-axis voltage, a controller that converts the difference between the q-axis reference voltage and the q-axis voltage into a d-axis current of a stator of the motor, and a summation circuit that obtains a d-axis reference current by adding the d-axis current of the stator of the motor and a feed forward d-axis current of the stator of the motor.
    Type: Grant
    Filed: October 25, 2016
    Date of Patent: June 26, 2018
    Assignee: Microchip Technology Inc.
    Inventors: Prasad Kulkarni, Ramesh Kankanala, Debraj Deb
  • Patent number: 9929683
    Abstract: Provided is a motor drive device which performs switching, with respect to a synchronous motor including a stator around which a motor winding is wound and a rotor holding a permanent magnet, from a synchronous operation in which the synchronous motor is synchronously driven to position-sensorless vector control in which a current supplied to the motor winding is controlled based on a position of the rotor. During the synchronous operation, the present motor drive device calculates, by estimation, an induced voltage error based on the detected current and voltage, performs control of an amplitude of a current instruction such that an error, of a target induced voltage, calculated based on an estimated induced voltage and based on an internal angle becomes equal to the induced voltage error, and switches the mode to the sensorless mode after the error is reduced to be within a range of a predetermined value.
    Type: Grant
    Filed: August 28, 2015
    Date of Patent: March 27, 2018
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Daisuke Sonoda, Mitsuhiro Sakamoto, Toru Tazawa
  • Patent number: 9853559
    Abstract: Disclosed herein is a power conversion device including a storage and a power conversion controller. The storage stores multiple values, each correlated to a disturbance that causes distortion in a current to a power converter, in association with a phase angle of a voltage of an AC power supply. The power conversion controller controls ON/OFF operations by using the values stored in the storage to compensate for a manipulated variable of control performed by the power converter in association with the phase angle of the voltage of the AC power supply.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: December 26, 2017
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Tomoisa Taniguchi, Morimitsu Sekimoto, Takurou Ogawa, Eiji Tooyama, Nobuo Hayashi
  • Patent number: 9716449
    Abstract: A system and method are provided for reducing the energy consumed by a pump jack electric motor by reducing the supply voltage to the motor when the motor would be generating energy in open loop mode. By substantially eliminating the energy generation mode, the braking action of the utility grid in limiting the acceleration of the motor and system that would otherwise occur is substantially removed. The motor and system will speed up, allowing the natural kinetic energy of the cyclic motion to perform part of the pumping action. In particular, when the energy consumption for the electric motor connected with the device having a rotating or reciprocating mass goes to zero, the line voltage to the motor is switched off, causing the frequency of the voltage across the motor terminals to increase. When the period of the voltage across the motor terminals returns to substantially the same as the period of the line voltage, the line voltage is switched on or reapplied to the motor.
    Type: Grant
    Filed: April 1, 2014
    Date of Patent: July 25, 2017
    Assignee: The PowerWise Group, Inc.
    Inventors: John L. Lumsden, Paul H. Kelley, Vasan Venkataraman
  • Patent number: 9628015
    Abstract: A system and method are provided for saving energy for an electric motor having periodic load variations by reducing the supply voltage to the motor during an open loop mode. The motor and system will speed up, allowing the natural kinetic energy of the cyclic motion to perform part of the pumping action. A closed loop controller computes information from the observed phase angle between the voltage and current supplied to the motor. By reducing the supply voltage to the motor, the observed phase angle may be reduced to a target phase angle value. By allowing some current flow, primarily of a reactive nature, an observable feedback parameter may be used in the closed loop control system as an indication of the load condition, to which the closed loop motor controller may react, supplying power when needed, such as in the energy consumption mode.
    Type: Grant
    Filed: August 29, 2014
    Date of Patent: April 18, 2017
    Assignee: The PowerWise Group, Inc.
    Inventors: John L. Lumsden, Paul H. Kelley, Vasan Venkataraman
  • Patent number: 9287815
    Abstract: In a power converter, vibration and noise of a motor due to pulsation of a direct current link voltage are reduced. An inverter circuit is provided, which is configured to convert a direct current link voltage having a pulsating component to an alternating current to output the alternating current to a permanent magnet synchronous motor. A controller is provided, which is configured to control the inverter circuit by vector control and which, in a control state in which fundamental voltage vectors do not include a zero vector (voltage vector for which a motor terminal voltage is zero), performs such control that the phase of a resultant voltage vector of a d-axis voltage vector and a q-axis voltage vector of the permanent magnet synchronous motor varies depending on pulsation.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: March 15, 2016
    Assignee: Daikin Industries, Ltd.
    Inventors: Yueqiang Zhou, Toshiyuki Maeda
  • Patent number: 9194897
    Abstract: An electronic watt-hour meter of according to an aspect of the invention includes: a first multiplexer receiving a plurality of detected currents detected in respective polyphase power lines in parallel; a first signal converter converting a signal output from the first multiplexer into a digital signal; a first demultiplexer outputting a serial input from the first signal converter in parallel; a line voltage generator generating a plurality of line voltages from the plurality of detected voltages; a second multiplexer receiving the plurality of line voltages in parallel, to output the received line voltages in series; a second signal converter converting a signal output from the second multiplexer into a digital signal; a second demultiplexer outputting a serial input from the second signal converter in parallel; and an calculating unit calculating a power value from a signal output from the first demultiplexer and a signal output from the second demultiplexer.
    Type: Grant
    Filed: December 23, 2011
    Date of Patent: November 24, 2015
    Assignees: Samsung Electro-Mechanics Co., Ltd., Korea Electric Power Corporation
    Inventor: Shin Jae Kang
  • Patent number: 9007006
    Abstract: Provided is a pump system. The pump system includes an AC (alternating current) electric motor, a converter, a smoothing unit, an inverter, a volt/hertz pulse width-modulation controller, and a main controller. The AC electric motor operates a pump which is a load. The converter receives AC power and converts the AC power into DC (direct current) power. The smoothing unit smoothes a DC voltage converted by the converter. The inverter converts the DC voltage output from the smoothing unit into an AC voltage. The volt/hertz pulse width-modulation controller applies switching voltage to a semiconductor switching device of the inverter. The main controller changes an operating frequency according to a load detected when the Ac electric motor is in operation and puts the AC electric motor to a sleep mode after determining a load operation status.
    Type: Grant
    Filed: March 14, 2012
    Date of Patent: April 14, 2015
    Assignee: LSIS Co., Ltd.
    Inventor: Hong Min Yun
  • Patent number: 9003826
    Abstract: The motor (1) of the present invention is fed by the mains voltage (Vac), and comprises a main winding (MW), an auxiliary winding (AW), a first triac (2) connected in series to the auxiliary winding (AW) which provides to start up the motor (1) by being actuated at the moment of start up in order to operate the motor (1), a second triac (3) connected in series to the main winding (MW) which provides the motor (1) to continue operating and a control unit (4) which controls the start up and operation of the motor (1) by actuating the triacs (2 and 3) when required.
    Type: Grant
    Filed: May 13, 2010
    Date of Patent: April 14, 2015
    Assignee: Arcelik Anonim Sirketi
    Inventors: Oner Hatipoglu, Ahmet Ihsan Yuce, Mustafa Yuksel, Mucahit Bacaksiz
  • Patent number: 9000701
    Abstract: Methods, systems and apparatus are provided for generating voltage commands used to control operation of a permanent magnet machine. For example, a control system is provided that generates voltage command signals for controlling a permanent magnet machine during a transition from an initial operating condition to a final operating condition. The control system includes a processor configured to execute software instructions, and a memory configured to store software instructions accessible by the processor. The software instructions comprise a voltage command generator module. Based on an electrical angular frequency of the permanent magnet machine, and synchronous reference frame current signals, the voltage command generator module is configured to generate ramped voltage command signals that each change linearly in accordance with a slope during a transition period that is set to a rise time.
    Type: Grant
    Filed: December 4, 2012
    Date of Patent: April 7, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: Steven E. Schulz, Bon Ho Bae, Konstantin S. Majarov, Yo Chan Son
  • Patent number: 8975846
    Abstract: A control device performs voltage conversion control on a voltage conversion circuit between a power supply and motor control circuits which control a plurality of motors. The control device includes sampling units for sampling a DC voltage after voltage conversion, target voltage setting units for setting target voltages VHT1 and VHT2 of the plurality of motors, selection unit for selecting a target voltage VHT to be converted by the voltage conversion circuit from a plurality of target voltages VHT1 and VHT2, generating unit for generating a sampling timing TS on the basis of a gate signal GS1 or GS2 of one of the motors with the target voltage which has not been selected, and control unit for performing the voltage conversion control using the DC voltage sampled by the sampling units at the sampling timing TS in response to each sampling timing request DS in the voltage conversion control.
    Type: Grant
    Filed: April 18, 2011
    Date of Patent: March 10, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Masashi Kobayashi
  • Publication number: 20150056083
    Abstract: A system and method are provided for saving energy for an electric motor having periodic load variations by reducing the supply voltage to the motor during an open loop mode. The motor and system will speed up, allowing the natural kinetic energy of the cyclic motion to perform part of the pumping action. A closed loop controller computes information from the observed phase angle between the voltage and current supplied to the motor. By reducing the supply voltage to the motor, the observed phase angle may be reduced to a target phase angle value. By allowing some current flow, primarily of a reactive nature, an observable feedback parameter may be used in the closed loop control system as an indication of the load condition, to which the closed loop motor controller may react, supplying power when needed, such as in the energy consumption mode.
    Type: Application
    Filed: August 29, 2014
    Publication date: February 26, 2015
    Inventors: John L. Lumsden, Paul H. Kelley, Vasan Venkataraman
  • Publication number: 20150028793
    Abstract: A motor control apparatus includes a secondary-magnetic-flux-command calculating unit including a minimum-current-secondary-magnetic-flux-command calculating unit that calculates a secondary magnetic flux command for minimizing a current root-mean-square value due to a torque current and an excitation current and a PWM-signal generating unit that generates a torque current command for outputting a desired torque command and an excitation current command for outputting the secondary magnetic flux command, performs vector control such that a q-axis current, which is a detection value of the torque current, and a d-axis current, which is a detection value of the excitation current, respectively coincide with the torque current command and the excitation current command, and generates control signals for turning on and off a switching element in an inverter.
    Type: Application
    Filed: January 30, 2013
    Publication date: January 29, 2015
    Inventors: Takuji Yoshimoto, Yoshinori Yamashita
  • Patent number: 8896245
    Abstract: Embodiments of the present disclosure relate to methods, systems and apparatus for generating voltage command signals for controlling operation of an electric machine. The disclosed embodiments can reduce current and torque oscillation, which can in turn improve machine efficiency and performance, as well as utilization of the DC voltage source.
    Type: Grant
    Filed: March 26, 2012
    Date of Patent: November 25, 2014
    Assignee: GM Global Technology Operations LLC.
    Inventors: Gabriel Gallegos-Lopez, Milun Perisic
  • Publication number: 20140340019
    Abstract: An inverter is provided. The inverter includes a current providing unit providing a first axis current and a second axis current to an induction motor; a revolutions per minute (RPM) measuring unit measuring the RPM of the induction motor; and a control unit changing the second axis current according to the measured RPM.
    Type: Application
    Filed: March 25, 2014
    Publication date: November 20, 2014
    Applicant: LSIS CO., LTD.
    Inventors: BYUNG WOON JANG, CHUN SUK YANG, JAE HOON JANG, JOONG KI JUNG, SUN WOO LEE
  • Patent number: 8853991
    Abstract: A system and method of detecting phase angle in an inverter is provided. A shunt resistor is coupled to a controller which is part of an inverter circuit and a phase angle may be directly derived from the detected voltage across the shunt resistor. The detected shunt voltage may be used to adjust the power delivery from the inverter to the load.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: October 7, 2014
    Assignee: General Electric Company
    Inventors: Mingwei Shan, William Hull Bicknell, Eric K. Watson, Richard D. Suel, II
  • Patent number: 8853992
    Abstract: A conveyor system and a method for driving a conveyor are disclosed. In the method, electric power is supplied to the drive machinery of a conveyor depending on the power requirement with a supply device to be selected from at least two different adjustable supply devices, and the supply device supplying power to the drive machinery is changed on the basis of the power requirement of the conveyor.
    Type: Grant
    Filed: July 3, 2013
    Date of Patent: October 7, 2014
    Assignee: Kone Corporation
    Inventor: Anthony S. Boom
  • Patent number: 8836270
    Abstract: In an inverter system, a phase adjusting unit configured to adjust, according to reception timing of first data, a phase of second PWM carrier to match a phase of first PWM carrier. A master inverter further includes an amplitude adjusting unit configured to adjust, when second data is received by a communication unit, according to the received second data, amplitude of a first command voltage to balance an actual output current output from a master inverter to the motor and an actual output current output from each of one or more slave inverters to the motor.
    Type: Grant
    Filed: June 18, 2012
    Date of Patent: September 16, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Goichi Kajiura, Masanori Kato
  • Patent number: 8823307
    Abstract: A system, method and computer program product for monitoring including detecting internal faults especially inter-turn faults of a synchronous generator and thus protecting the synchronous generator. The synchronous generator includes a winding for each phase of a power network, a terminal for each phase arranged on a terminal side of the synchronous generator, and connected to the respective winding, the terminals on the terminal side are connected to an electrical power network, and the synchronous generator is arranged to input power to the electrical power network by means of the terminals.
    Type: Grant
    Filed: January 3, 2014
    Date of Patent: September 2, 2014
    Assignee: ABB Research Ltd.
    Inventors: Zoran Gajic, Mustafa Ibrahim, Antonis Marinopoulos, Pedro Rodriguez, Jianping Wang, Liwei Wang
  • Patent number: 8823314
    Abstract: A system and method are provided for reducing the energy consumed by a pump jack electric motor by reducing the supply voltage to the motor when the motor would be generating energy in open loop mode. By substantially eliminating the energy generation mode, the braking action of the utility grid in limiting the acceleration of the motor and system that would otherwise occur is substantially removed. The motor and system will speed up, allowing the natural kinetic energy of the cyclic motion to perform part of the pumping action. A closed loop controller in electrical connection with the motor computes the necessary information from the observed phase angle between the voltage and current supplied to the motor. By reducing the supply voltage to the motor, the observed phase angle may be reduced to a target phase angle value.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: September 2, 2014
    Assignee: The Powerwise Group, Inc.
    Inventors: John L. Lumsden, Paul H. Kelley, Vasan Venkataraman
  • Patent number: 8823297
    Abstract: The invention relates to a method of control implemented in a variable speed drive for controlling the deceleration of an electric motor (M) in the case of electrical power outage. The method of control comprises: a step of determining the Joule-effect losses to be applied to the electric motor (M) and to the variable speed drive according to a deceleration ramp to be applied to the electric motor (M) during an electrical power outage, a step of determining the flux reference (?ref) as a function of the said Joule-effect losses to be applied to the electric motor (M) and to the variable speed drive.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: September 2, 2014
    Assignee: Schneider Toshiba Inverter Europe SAS
    Inventors: Ludovic Kermarrec, Francois Malrait
  • Patent number: 8810190
    Abstract: A motor controller (4) and method for maximizing the energy savings in an AC induction motor (3) at every load wherein the motor is calibrated at two or more load points to establish a control line (6), which is then programmed into a non-volatile memory (30) of the motor controller. A DSP-based closed-loop motor controller observes the motor parameters of the motor such as firing angle/duty cycles (23), voltage (37), current (9) and phase angles to arrive at a minimum voltage necessary to operate the motor at any load along the control line. The motor controller performs closed-loop control to keep the motor running at a computed target control point, such that maximum energy savings are realized by reducing voltage through pulse width modulation.
    Type: Grant
    Filed: September 10, 2008
    Date of Patent: August 19, 2014
    Assignee: The PowerWise Group, Inc.
    Inventor: Paul H. Kelley
  • Patent number: 8810170
    Abstract: A method for monitoring input power to an electronically commutated motor (ECM) is described. The method includes determining, with a processing device, an average input current to the motor, the average input current based on a voltage drop across a shunt resistor in series with the motor, measuring an average input voltage applied to the motor utilizing the processing device, multiplying the average input current by the average voltage to determine an approximate input power, and communicating the average input power to an external interface.
    Type: Grant
    Filed: January 4, 2013
    Date of Patent: August 19, 2014
    Assignee: Regal Beloit America, Inc.
    Inventors: Mark A. Brattoli, Guy Bonner, Jr.
  • Publication number: 20140203755
    Abstract: An electric motor controller is configured to be coupled to an electric motor. The controller includes an inverter and a control unit coupled to the inverter. The inverter is configured to receive an input voltage and to provide a conditioned output voltage to the electric motor. The control unit is configured to control the electric motor to produce positive torque when direct current (DC) link voltage has a 100% voltage ripple. Methods for controlling an electric motor using the electric motor controller are also provided.
    Type: Application
    Filed: January 24, 2013
    Publication date: July 24, 2014
    Applicant: Regal Beloit America, Inc.
    Inventors: ROGER CARLOS BECERRA, Ludovic Andre Chretien, Glen C. Young, David Allen Clendenen, Yao Da
  • Publication number: 20140203756
    Abstract: In an inverter system, a phase adjusting unit configured to adjust, according to reception timing of first data, a phase of second PWM carrier to match a phase of first PWM carrier. A master inverter further includes an amplitude adjusting unit configured to adjust, when second data is received by a communication unit, according to the received second data, amplitude of a first command voltage to balance an actual output current output from a master inverter to the motor and an actual output current output from each of one or more slave inverters to the motor.
    Type: Application
    Filed: June 18, 2012
    Publication date: July 24, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Goichi Kajiura, Masanori Kato
  • Patent number: 8779700
    Abstract: What is described is a battery management architecture that eliminates previously described problems of the previous solutions and compensates for the extra cost of a cell-balancing circuit. These advantages are achieved by integrating the voltage step-up and balancing functions as well as charging functions inside a single converter topology. Instead of providing the entire output voltage and power, the converter in this configuration is merely assisting the battery by providing a portion of the power delivered to the load, rather than the entirety of the power delivered to the load. This portion of power is proportional to the difference between the output and the battery pack voltages.
    Type: Grant
    Filed: August 27, 2013
    Date of Patent: July 15, 2014
    Assignee: Sendyne Corporation
    Inventors: Aleksandar Prodic, Mahmoud Shousha, Victor Marten, Ioannis Milios
  • Patent number: 8779716
    Abstract: The present invention relates to a multi output inverter that is adapted to supply mains powered appliances 47-49 and/or poly-phase motors 50, 51.
    Type: Grant
    Filed: May 1, 2013
    Date of Patent: July 15, 2014
    Assignee: Power Concepts NZ Limited
    Inventor: Christopher William Fotherby
  • Patent number: 8764426
    Abstract: A power supplying apparatus for supplying power to servo amplifiers is configured by an AC/DC converter and a predetermined power storage circuit. In a process of a molding cycle except for an injection process, power is supplied from the AC/DC converter, and the power is stored in the power storage circuit. In the injection process, the AC/DC converter and the power storage circuit are controlled in conjunction with each other to supply the stored power, which is required when performing the injection process, from the power storage circuit, so as to prevent the AC/DC converter from supplying an excessive amount of power.
    Type: Grant
    Filed: July 6, 2011
    Date of Patent: July 1, 2014
    Assignee: The Japan Steel Works, Ltd.
    Inventor: Kiyoshi Ochi
  • Patent number: 8736215
    Abstract: A motor drive device (1) of the present invention includes a converter unit (10) and an inverter unit (30). The converter unit (10) includes: power supply voltage monitoring unit (3) for detecting a power failure; DC link voltage detecting means (4); capacitor total capacity calculating means (6) which calculates total capacity of DC link smoothing capacitors (17, 18) and calculates a DC link low-voltage alarm detection level for an instantaneous power failure; DC link low-voltage alarm detection level setting means (8) which varies the DC link low-voltage alarm detection level for an instantaneous power failure as necessary; and alarm generating means (7) which monitors the DC link voltage and generates an alarm to protect the converter unit. In the case where a power failure is detected, the DC link low-voltage alarm detection level is increased in accordance with the total capacity of the DC link smoothing capacitors (17, 18).
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: May 27, 2014
    Assignee: FANUC Corporation
    Inventors: Masakazu Niwa, Koujirou Sakai
  • Patent number: 8698447
    Abstract: A system and method are provided for reducing the energy consumed by a pump jack electric motor by reducing the supply voltage to the motor when the motor would be generating energy in open loop mode. By substantially eliminating the energy generation mode, the braking action of the utility grid in limiting the acceleration of the motor and system that would otherwise occur is substantially removed. The motor and system will speed up, allowing the natural kinetic energy of the cyclic motion to perform part of the pumping action.
    Type: Grant
    Filed: April 19, 2012
    Date of Patent: April 15, 2014
    Assignee: The Powerwise Group, Inc.
    Inventors: John L. Lumsden, Paul H. Kelley, Vasan Venkataraman
  • Patent number: 8698446
    Abstract: A system and method are disclosed for turning off the voltage to a pump jack electric motor during predetermined periods of time to save energy. In the method, the motor's response to closed-loop control may be evaluated over several pump strokes. The periods of the pump stroke when it is feasible to turn off the motor may be identified. The consistency of the measurements over several strokes may be evaluated. The motor may be turned off during predetermined periods on subsequent pump strokes when each pump stroke shows sufficiently similar behavior to that predicted during the closed-loop control process. The system may return to the closed-loop control process after a predetermined period of time to adjust to any changes in the system.
    Type: Grant
    Filed: December 14, 2010
    Date of Patent: April 15, 2014
    Assignee: The PowerWise Group, Inc.
    Inventor: Vasan Venkataraman
  • Publication number: 20140062354
    Abstract: An inverter device may include a converter unit configured to receive single phase AC power to output DC power; a capacitor unit configured to absorb the DC power; an inverter unit configured to synthesize the absorbed DC power to output the drive power of a load; and a converter controller configured to control the converter unit based on the AC power and the output DC power of the converter unit, wherein the converter controller includes a converter gate signal generator configured to control a plurality of gates contained in the converter unit; and an input line harmonic voltage generator configured to output converter additional power having a predetermined multiple of the frequency of the fundamental frequency component of the AC power with the same size as that of the fundamental frequency component of the AC power to an adder connected to the input side of the converter gate signal generator.
    Type: Application
    Filed: August 28, 2013
    Publication date: March 6, 2014
    Applicant: LSIS CO., LTD.
    Inventors: Seung Cheol CHOI, Anno YOO
  • Patent number: 8664909
    Abstract: A miniaturizable, low-cost highly reliable inverter unit. A control circuit section for controlling operating timing of high breakdown voltage semiconductor elements included in an inverter circuit section and first and second drive and abnormality detection circuit sections for outputting drive signals for driving the high breakdown voltage semiconductor elements according to the operating timing and for feeding back an abnormality of the inverter circuit section to the control circuit section are formed on an SOI substrate as one integrated circuit chip. On the integrated circuit chip, circuit formation areas which differ in reference potential are separated from one another by dielectrics. A plurality of level shifters for transmitting signals exchanged between circuit formation areas separated by the dielectrics are formed.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: March 4, 2014
    Assignees: Fuji Electric Co., Ltd., Honda Motor Co., Ltd., Sharp Kabushiki-Kaisha
    Inventors: Hitoshi Sumida, Akinobu Teramoto, Ken-ichi Nonaka, Toshio Naka
  • Publication number: 20140042839
    Abstract: An inverter device includes: an inverter circuit configured to perform ON/OFF operations with a preset duty cycle to convert a DC power into an AC power and output the AC power to an AC motor; and a controller configured to change a duty cycle of the ON/OFF operations.
    Type: Application
    Filed: March 14, 2012
    Publication date: February 13, 2014
    Applicant: Hitachi Koki Co., Ltd.
    Inventors: Yuki Horie, Shinji Watanabe, Yasushi Nakano, Yukihiro Shima
  • Patent number: 8648562
    Abstract: An apparatus for improving machine drive performance. The apparatus includes a controller configured to control an impedance of a converter. The converter is configured to be electrically coupled to a plurality of first ends of a plurality of windings of a machine. A plurality of second ends of the plurality of windings of the machine are configured to be electrically coupled to a power source.
    Type: Grant
    Filed: August 9, 2010
    Date of Patent: February 11, 2014
    Inventor: Thomas A. Lipo
  • Patent number: 8633668
    Abstract: A device for improving efficiency of an induction motor soft-starts the motor by applying a power to the motor that is substantially less than the rated power of the motor then gradually increasing the power while monitoring changes in current drawn by the motor, thereby detecting when maximum efficiency is found. Once maximum efficiency is found, the nominal motor current is found and operating ranges are set. Now, the phase angle between the voltage and the current to the motor is measured and power to the motor is increasing when the phase angle is less than a minimum phase angle (determined during soft-start) and power to the motor is decreased when the phase angle is greater than or equal to the minimum phase angle as long as the voltage does not fall below a minimum voltage determined during soft-start.
    Type: Grant
    Filed: July 17, 2013
    Date of Patent: January 21, 2014
    Assignee: Protective Energy Economizer Technology
    Inventor: Mario Marcelo Marcoccia
  • Patent number: 8629637
    Abstract: A three-phase regenerative drive (20) is operated based upon power from a single-phase AC source (12) and power from a DC source (14). The single-phase AC input power and the DC input power are converted to DC voltage on a DC bus (24) by a three-phase converter (22). DC power is provided from the DC bus (24) to a three-phase inverter having outputs connected to a motor (34). A controller (44) controls operation of the three-phase converter (22) based upon contribution factors of the AC and DC sources (12, 14) during motoring and regeneration. The controller (44) also controls an AC component of current from the DC source to reduce ripple current on the DC bus (24).
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: January 14, 2014
    Assignee: Otis Elevator Company
    Inventors: Vladimir Blasko, Ismail Agirman, Stella M. Oggianu, Robert K. Thornton
  • Publication number: 20130300339
    Abstract: A conveyor system and a method for driving a conveyor are disclosed. In the method, electric power is supplied to the drive machinery of a conveyor depending on the power requirement with a supply device to be selected from at least two different adjustable supply devices, and the supply device supplying power to the drive machinery is changed on the basis of the power requirement of the conveyor.
    Type: Application
    Filed: July 3, 2013
    Publication date: November 14, 2013
    Inventor: Anthony S. BOOM
  • Patent number: 8581534
    Abstract: A method for adjusting rotational speed of a motor is also disclosed. The method includes determining whether an input voltage of the motor enters into a predetermined voltage range; generating a pulse width modulation signal when the input voltage of the motor enters into the predetermined voltage range; and driving the motor to rotate according to the pulse width modulation signal.
    Type: Grant
    Filed: February 16, 2012
    Date of Patent: November 12, 2013
    Assignee: Anpec Electronics Corporation
    Inventors: Ming-Jung Tsai, Jyun-Ping Jiang, Ching-Sheng Li, Kun-Min Chen
  • Patent number: 8547053
    Abstract: An alternating current chopper circuit with low noise is disclosed. The circuit includes a switching circuit, a first freewheel circuit, and a second freewheel circuit. The switching circuit has a control switching unit, which turns on and or off accordingly to a control signal. The first freewheel circuit and the second freewheel circuit are for providing a current-conducting path to the motor, when the control switching unit is turned off.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: October 1, 2013
    Assignee: National Formosa University
    Inventors: Yu-Kai Chen, Chin-Hsiung Chang
  • Patent number: 8531150
    Abstract: A DCDC converter includes a switching circuit, to an input end of which an input filer circuit is connected, a smoothing filter circuit connected to an output end of the switching circuit and including a reactor and a capacitor, and a control unit that feeds back a state amount of the smoothing filter circuit and turns the switching circuit on and off. The control unit includes a damping control unit that calculates, based on the voltage of the capacitor, a damping operation amount for adjusting a state amount of the smoothing filter circuit.
    Type: Grant
    Filed: September 19, 2008
    Date of Patent: September 10, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventor: Hidetoshi Kitanaka
  • Publication number: 20130220352
    Abstract: Exemplary embodiments or implementations are disclosed of methods, apparatus, and systems for operating motors in variable speed situations. In an exemplary implementation, a method of controlling a variable-speed motor includes defining a control duration as a predetermined number of cycles of a multiple-phase power supply. Each speed in a range of speeds is defined by a corresponding number of the cycles of the control duration. Power is provided to the motor from the power supply at a selected one of the speeds, by enabling input from the power supply for the number of the cycles of the control duration corresponding to the selected speed.
    Type: Application
    Filed: July 13, 2012
    Publication date: August 29, 2013
    Applicant: EMERSON ELECTRIC CO.
    Inventors: Ping Shan, Cai Bing Zhang
  • Patent number: 8496085
    Abstract: An angular velocity estimate (?e) used in motor control of an electric power steering is obtained as follows. In a first state period during which the motor substantially stops its rotation, a resistance calculation unit calculates a motor resistance value (Rc) on the basis of a detected value (Vm) of motor voltage and a detected value (Im) of motor current. An average calculation unit obtains an average value (Rav) of the calculated resistance values (Rc) in a retained period. A current-resistance characteristic that associates motor current with motor resistance is held in a characteristic holding unit, and a characteristic updating unit updates the current-resistance characteristic on the basis of the average value (Rav). An estimate calculation unit calculates the angular velocity estimate (?e) on the basis of the detected value (Vm) of motor voltage, the detected value (Im) of motor current and a motor resistance value (Rm) obtained from the current-resistance characteristic.
    Type: Grant
    Filed: June 21, 2010
    Date of Patent: July 30, 2013
    Assignee: JTEKT Corporation
    Inventors: Takeshi Ueda, Shingo Maeda, Yoshinobu Shimizu, Hayato Komatsu