Frequency Or Pulsation Control Patents (Class 318/503)
  • Patent number: 10727766
    Abstract: A rotation speed calculation device of a brushless motor includes: a current acquisition unit that acquires magnitude of current flowing through a coil of the brushless motor; a supply voltage acquisition unit that acquires supply voltage supplied to the brushless motor; and a calculation unit that calculates rotation speed of the brushless motor based on the magnitude of the current acquired by the current acquisition unit, the supply voltage acquired by the supply voltage acquisition unit, and a voltage equation calculating the rotation speed based on the magnitude of the current and the supply voltage. The voltage equation is an equation in which a member expressing a voltage drop due to inductance of a winding of the coil of the brushless motor is expressed by a product of a factor proportional to the current and a factor proportional to the rotation speed of the brushless motor.
    Type: Grant
    Filed: October 2, 2018
    Date of Patent: July 28, 2020
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventor: Shumpei Fujii
  • Patent number: 10707799
    Abstract: In order to reduce the number of current detectors detecting phase current in a power converting device that controls a power converter connected to a motor, thereby achieving a size reduction, the power converting device includes a current detector that detects, of winding groups of multi-phase windings, a total value of values of current flowing into a first switching element connected to a first phase of a first winding group and a second switching element connected to a second phase of a second winding group, and calculates a current value of another phase from current detected by the current detector.
    Type: Grant
    Filed: November 22, 2016
    Date of Patent: July 7, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Mitsuru Ishizuka
  • Patent number: 10664554
    Abstract: A measurement apparatus is used in cooperation with another equivalent measurement apparatus. Each measurement apparatus includes a change amount calculator for calculating a change amount of measured values, an average value generator for generating a first internal average value based on the change amount, and a communication unit for receiving a second internal average value that was generated by at least one other measurement apparatus. The average value generator generates a third internal average value, using a computation result based on at least the first and second internal average values.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: May 26, 2020
    Assignee: DAIHEN Corporation
    Inventors: Akihiro Ohori, Nobuyuki Hattori
  • Patent number: 10651760
    Abstract: For a power supply with a reduced number of semiconductor devices, a phase shifting transformer receives a three-phase primary voltage and steps the three-phase primary voltage one of up and down to a secondary voltage with a plurality of secondary winding sets. There is phase shifting between different secondary winding sets. A plurality of power cell sets each comprise a plurality of power cells cascaded connected, and each power cell receives one of a single phase and a three-phase voltage of a distinct secondary winding set of the phase shifting transformer. Each power cell comprises no more than eight power semiconductor devices organized as a rectifier and an inverter. Each power semiconductor device is one of a diode and an active switch. Each power cell set generates one phase of a three-phase alternating current output.
    Type: Grant
    Filed: April 24, 2019
    Date of Patent: May 12, 2020
    Assignee: Rockwell Automation Technologies, Inc
    Inventors: Zhong Y. Cheng, Navid R. Zargari, Ye Zhang
  • Patent number: 10622885
    Abstract: The present invention relates to a method for controlling an inverter to prevent an unnecessary fan trip. The method includes: receiving a fan current; when the fan current is above a high trip level or is below a low trip level, incrementing an error count; when the error count reaches an error count maximum value, incrementing a trip count and initializing the error count; and when the trip count reaches a trip count maximum value, generating a fan trip signal.
    Type: Grant
    Filed: February 22, 2019
    Date of Patent: April 14, 2020
    Assignee: LSIS CO., LTD.
    Inventors: Tae-Suk Bae, Deok-Young Lim, Hu-Jin Lee, Chun-Suk Yang
  • Patent number: 10447181
    Abstract: Motor controller of the present invention is used in an automobile including wheel drive motor, wheel drive inverter, and cooling fan being an accessory. Wheel drive inverter drives wheel drive motor by PWM control at a primary carrier frequency. Cooling fan has fan motor being an accessory drive motor. Motor controller includes accessory drive inverter and frequency switch. Accessory drive inverter drives fan motor by PWM control at a secondary carrier frequency. Frequency switch switches a frequency of the secondary carrier frequency based on the primary carrier frequency.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: October 15, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Mineaki Isoda, Masahito Hidaka, Koji Kuyama
  • Patent number: 10193432
    Abstract: A method for data transfer of an electric device configuration, the electric device configuration comprising a plurality of converter devices including a first converter device and a second converter device, each of the converter devices comprising a first converter unit having a first power connection and a second power connection, the first power connection arranged to supply direct current power to the first converter unit and the second power connection arranged to supply electric power from the first converter unit, and the first power connections of the first converter units being electrically connected to one another.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: January 29, 2019
    Assignee: ABB Technology Oy
    Inventors: Petri Maksimainen, Matti Veijanen, Jussi Rantanen
  • Patent number: 10148166
    Abstract: A power converter includes a control unit that generates a modulated wave synchronized with an output voltage command and a carrier wave having a frequency higher than a frequency of the modulated wave, the control unit controlling the power converter by comparing the modulated wave and the carrier wave to output a switching signal for driving a switching element. When a modulation factor in converting DC power into AC power is equal to or higher than a mode switching modulation factor and is lower than ?/4, the power converter converts the DC power into the AC power in an over-modulation mode, in which switching of the switching element is stopped for a period longer than one cycle of the carrier wave, in a first period in which an output voltage command is positive and timing of a positive peak value of the output voltage command is included.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: December 4, 2018
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yoshinori Yamashita, Sho Kato, Hisanori Yamasaki
  • Patent number: 10135378
    Abstract: The present invention provides a V/F control method for an induction motor comprising: extracting a reactive current and an active current and performing a differential calculation on them respectively to obtain a differential of the reactive current and a differential of the active current; multiplying the differential of the reactive current and the differential of the active current by a first coefficient and a second coefficient respectively; obtaining the sum of the result of multiplying the differential of the reactive current by the first coefficient and the result of multiplying the differential of the active current by the second coefficient; applying low-pass filtering on the sum to obtain a compensation; and superposing the compensation onto an original given angular frequency to perform V/F control.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: November 20, 2018
    Assignee: Eaton Intelligent Power Limited
    Inventors: Kevin Lee, Dawei Li, Anbo Yu
  • Patent number: 10075097
    Abstract: To generate a PWM signal, as an on/off signal of a semiconductor switch that constitutes a power conversion main circuit, by comparing a modulation wave command based on an input voltage waveform command of the power conversion main circuit with a carrier wave having changes from a lower limit to an upper limit and from the upper limit to the lower limit for an integral number of times per one cycle of an AC power supply, where the carrier wave has characteristics such that one change time from the lower limit to the upper limit and then returning to the lower limit is constant, and a time ratio between a change time from the lower limit to the upper limit and a change time from the upper limit to the lower limit changes periodically.
    Type: Grant
    Filed: November 28, 2013
    Date of Patent: September 11, 2018
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kotaro Matsuda, Hisanori Yamasaki
  • Patent number: 10050546
    Abstract: An apparatus for controlling an LLC converter is provided. The apparatus includes a current controller that determines a first switching frequency control value of a switching element in the LLC converter to cause an output current detection value of the LLC converter to correspond to a predetermined output current command value. Additionally, a feedforward controller determines a second switching frequency control value for operating the switching element by applying a feedforward control value that corresponds to a ripple component included in an input voltage of the LLC converter to the first switching frequency control value.
    Type: Grant
    Filed: November 13, 2017
    Date of Patent: August 14, 2018
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Gyu Tae Choi, Hyun Wook Seong, Hyung Bin Ihm, Gi Bong Son, Hui Sung Jang
  • Patent number: 10003188
    Abstract: In an active converter that is connected to an electric machine, in which arresting circuits for activating a voltage arrest beginning at a first point in time are provided, and which is also configured for activating a load shedding reaction only when activation conditions are fulfilled beginning at a second point in time, the activation conditions include determining that the voltage arrest is still activated at the second point in time, that a voltage potential has not yet fallen below the first threshold value, and/or that a value that indicates a current flowing through at least one phase connection is above a third threshold value.
    Type: Grant
    Filed: January 14, 2016
    Date of Patent: June 19, 2018
    Assignee: SEG Automotive Germany GmbH
    Inventor: Paul Mehringer
  • Patent number: 9933695
    Abstract: A position detection device includes: a sensor that includes a light emission unit and a light reception unit receiving light emitted from the light emission unit; a driving unit; a gear (transmission gear) that is disposed at a position facing the sensor and is rotated by power from the driving unit; and a control unit that drives the driving unit based on an amount of light received by the light reception unit and detected by the sensor.
    Type: Grant
    Filed: January 17, 2017
    Date of Patent: April 3, 2018
    Assignee: Seiko Epson Corporation
    Inventors: Hirofumi Okubo, Kazunori Maeta, Akira Nemura
  • Patent number: 9831760
    Abstract: An electrical converter is interconnected via a filter with an electrical load or an electrical power source.
    Type: Grant
    Filed: April 12, 2016
    Date of Patent: November 28, 2017
    Assignee: ABB Schweiz AG
    Inventors: Peter Al-Hokayem, Tobias Geyer, Nikolaos Oikonomou
  • Patent number: 9712096
    Abstract: This invention is concerning obtaining a control apparatus and a control method for an AC rotary machine, with which a voltage command can be used up to a saturation voltage in each group of windings even when dimension differences exist between the groups of windings. A voltage saturation determination unit determines whether or not voltage saturation has occurred in a first winding group or a second winding group on the basis of at least one of a voltage and a current relating to the first winding group and the second winding group, and when determination is made that voltage saturation has occurred in either the first winding group or the second winding group, generates a voltage saturation determination signal for reducing a gain of at least one axial direction component on a rotational two-axis coordinate system.
    Type: Grant
    Filed: April 28, 2014
    Date of Patent: July 18, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Akira Furukawa, Isao Kezobo, Tatsuya Mori
  • Patent number: 9705444
    Abstract: A device for controlling an electric motor is provided. The device includes: an inverter supplying a current to an electric motor; a current sensor sensing a current supplied from the inverter to the electric motor; and a control unit enabling the current to be supplied from the inverter to the electric motor, obtaining first and second offset values sensed from the current sensor at a plurality of times, comparing the plurality of offset values obtained, and updating the first offset value to the second offset value according to a result of comparing the offset values.
    Type: Grant
    Filed: January 14, 2015
    Date of Patent: July 11, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Gi Young Choi
  • Patent number: 9680407
    Abstract: An electric motor control device drives a power converter (30) by two-phase modulation drive based on calculation of a driving method setting and element loss calculation section (16) when an electric motor (4) is equal to or less than a predetermined rotational speed; and switches switching signals from a switching signal generation section (14) to switch a switching operation of the switching elements when a loss integrated value of a first switching element with a large switching loss or a second switching element exceeds a predetermined value.
    Type: Grant
    Filed: May 20, 2014
    Date of Patent: June 13, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tomohisa Shoda, Yasufumi Ogawa, Yoshimasa Nishijima
  • Patent number: 9562940
    Abstract: The invention relates to a method for monitoring a half bridge branch (38) in a half bridge (32), said half bridge branch (38) being connected in series with another half bridge branch (36) in the half bridge (32) via a center tap (30), including the steps of: —applying an electric supply potential (24) opposite the center tap (30) at the other half bridge branch (36) to the center tap (30) according to a predefined time curve (50); and —monitoring the half bridge branch (38) on the basis of a comparison (70) of the predefined time curve (50) and an electrical output potential (52) at the center tap (30).
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: February 7, 2017
    Assignee: Robert Bosch GmbH
    Inventors: Frank Fischer, Matthias Jacob, Georg Schulze-Icking-Konert
  • Patent number: 9520809
    Abstract: A rotary electric machine driving device including: an inverter that is electrically interposed between a direct-current power supply and the rotary electric machine, and converts electric power between a direct current and an alternating current; a smoothing capacitor that is electrically interposed between the direct-current power supply and the inverter, and is connected between a positive pole and a negative pole on a direct-current side of the inverter; an inverter control unit that controls switching of a switching element of the inverter according to a predetermined switching frequency; and an inductance control unit that switches a direct-current side inductance between a positive pole of the direct-current power supply and a positive pole of the smoothing capacitor, according to the switching frequency, between a predefined standard inductance and a high inductance that is higher than the standard inductance.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: December 13, 2016
    Assignee: AISIN AW CO., LTD.
    Inventors: Subrata Saha, Hirohisa Totani
  • Patent number: 9346487
    Abstract: The apparatus herein provided includes a plurality of systems including driving circuits (20a, 20b) for driving motor coils (3a, 3b) corresponding thereto, and a control unit (10) for controlling control values of the driving circuits (20a, 20b), wherein, when a fault occurs in at least one of the plurality of systems including the motor coils (3a, 3b), the control unit (10) decreases a control value of a system(s) in which the fault occurs from an ordinary time control value or stops the drive by the system(s) in which the fault occurs, and also increases a control value of another system(s) in which the fault does not occur to more than an ordinary time control value.
    Type: Grant
    Filed: January 11, 2012
    Date of Patent: May 24, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshihiko Kimpara, Akihiko Mori, Masaki Matsushita, Jiro Okada
  • Patent number: 9314900
    Abstract: A handheld grinder comprising a housing; a grinding disk; a motor; an output shaft connected to the grinding disk and the motor to impart rotary motion thereto; and a circuit board residing in the housing and having thereon a rectifier that receives an alternating current and converts the alternating current to a direct current, a switching arrangement having a plurality of motor switches connected electrically between the rectifier and the motor and operates to deliver the direct current from the rectifier to the motor, a capacitor connected electrically between the rectifier and the switching arrangement, wherein the capacitor is coupled in parallel across the rectifier, a driver circuit interfaced with the motor switches and operable to control switching operation of the motor switches, and a power switch connected electrically between the rectifier and the driver circuit and operable to selectively energize the driver circuit and power on the grinder disk.
    Type: Grant
    Filed: October 18, 2013
    Date of Patent: April 19, 2016
    Assignee: BLACK & DECKER INC.
    Inventors: John C. Vanko, Michael K. Forster, Matthew J. Velderman, John Howson
  • Patent number: 9154009
    Abstract: A control unit for controlling commutation of a brushless direct current (BLDC) motor provided. The control unit controls high-side and low-side switches arranged between a power source and the motor and configured as a three-phase bridge to commutate the motor. The control unit is configured to provide drive signals to drive each of the high-side and low-side switches to control, for each phase of the bridge, a pulse-width modulation (PWM) of one of the high-side or low-side switches. For each phase of the bridge, immediately following a first cycle ending with a falling edge of the drive signal for one of the high-side or low-side switches, the control unit introduces a special commutation edge pulse in the drive signal of the other of the high-side or low-side switches to shunt the current from the motor before turning both the high-side and the low-side switches off during a second cycle.
    Type: Grant
    Filed: June 17, 2013
    Date of Patent: October 6, 2015
    Assignee: Black & Decker Inc.
    Inventor: Redeat G. Alemu
  • Patent number: 9071185
    Abstract: There are provided a constant voltage circuit that outputs a stable constant voltage for an analog electronic clock, and an analog electronic clock featuring low current consumption and prolonged battery life. The constant voltage circuit has a first voltage holding circuit connected between the gate of an output transistor and an output terminal and a second voltage holding circuit connected between the gate of the output transistor and a ground terminal, and carries out control such that the second voltage holding circuit is enabled when the motor is operated.
    Type: Grant
    Filed: February 4, 2014
    Date of Patent: June 30, 2015
    Assignee: SEIKO INSTRUMENTS INC.
    Inventors: Kotaro Watanabe, Makoto Mitani
  • Publication number: 20150145462
    Abstract: Parallel converter current imbalance control apparatus and methods in which individual converter AC currents are measured for each phase, and the AC voltage control modulation indices associated with the converters having the highest and lowest AC currents for a given phase are adjusted to counteract current imbalance between the converters.
    Type: Application
    Filed: November 25, 2013
    Publication date: May 28, 2015
    Applicant: Rockwell Automation Technologies, Inc.
    Inventors: James A. Ulrich, Lixiang Wei, Jerome D. Rabe, Joseph D. Riley
  • Publication number: 20150145456
    Abstract: The present invention concerns a control system for an electric motor, wherein an operating mode with predetermined value assignments is selected for a parameter set for controlling an electric motor and the pulse frequency of a control signal for the electric motor is set in accordance with the selected operating mode in order thereby to signal to the electric motor the selected value assignments for the parameter set.
    Type: Application
    Filed: November 17, 2014
    Publication date: May 28, 2015
    Inventors: Christian Jelenowski, Martin Wucherer
  • Publication number: 20150145463
    Abstract: A filter for reducing radiated emissions in switching power converters such as a motor drive is disclosed. The switching power converter modulates a DC voltage input to generate a desired AC voltage output. Capacitors are connected in parallel between each output phase and a common connection, which may be a ground connection. The magnitude and layout of the capacitors are selected to minimize current conducted by the capacitors. The capacitors may be surface mount technology located proximate to the switching devices or the capacitors may be incorporated in the circuit board on which the switching devices are mounted. The filter may be applied to any of the switching elements in a motor drive, such as the inverter section, an active rectifier section, or a switched mode power supply.
    Type: Application
    Filed: February 4, 2015
    Publication date: May 28, 2015
    Inventors: Zoran Vrankovic, Craig Winterhalter, Gary Skibinski
  • Patent number: 9041333
    Abstract: There are provided a motor driving control apparatus, a motor driving control method, and a motor using the same. The motor driving control apparatus includes a controller, a duty ratio calculation unit, and a driving signal generation unit. The controller generates a speed control signal by using at least one of a speed signal of a motor device and a speed command signal input from the outside. The duty ratio calculation unit calculates a duty ratio of the speed control signal. The driving signal generation unit generates a driving control signal for controlling driving of the motor device by using the duty ratio.
    Type: Grant
    Filed: May 17, 2013
    Date of Patent: May 26, 2015
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Joo Yul Ko
  • Patent number: 9030146
    Abstract: A digital filter is configured to convert, into a digital value, the duty ratio of a control signal subjected to pulse width modulation according to a target toque to be set for a fan motor to be driven. A sampling circuit is configured to perform sampling of the output value of the digital filter at a sampling timing that is asynchronous with respect to the cycle of the control signal, so as to generate a torque instruction value. A driving circuit is configured to drive the fan motor according to the torque instruction value thus generated.
    Type: Grant
    Filed: July 25, 2013
    Date of Patent: May 12, 2015
    Assignee: Rohm Co., Ltd.
    Inventors: Toshiya Suzuki, Shinsuke Sano
  • Publication number: 20150121929
    Abstract: A motor incorporating a power converter including a printed board on which a semiconductor module (an inverter IC), which converts a voltage of an external power supply into a high-frequency voltage and supplies the high-frequency voltage to a stator, is mounted, wherein a high-voltage circuit ground, which is a power ground of a high-voltage main circuit system of the inverter IC, and a low-voltage circuit ground, which is a ground of a control circuit system, which is a low-voltage circuit, of the semiconductor module, are provided on the board, and the high-voltage circuit ground and the low-voltage circuit ground are connected at one point via a resistor.
    Type: Application
    Filed: June 8, 2012
    Publication date: May 7, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Michio Yamada, Yosuke Shinomoto, Hiroki Aso, Hiroyuki Ishii, Junichiro Oya
  • Patent number: 9024563
    Abstract: A pitch drive circuit that operates in an emergency mode, for a wind or water power plant. The circuit has at least one rectifier unit, at least one DC intermediate circuit, two inverter units and a pitch rotary current motor with motor trains that can be contacted on both sides. A first contact side of the motor trains is connected to a first inverter unit and a second contact side of the motor trains is connected to a second inverter unit. At least one switching element is connected to at least one contact side of the motor trains. In a normal operating mode of a first switching state of the switching element the motor trains can be energized via both inverter units, and in an emergency operating mode of a second switching state of the switching element, the motor trains can be energized via a single inverter unit.
    Type: Grant
    Filed: October 25, 2011
    Date of Patent: May 5, 2015
    Assignee: LTi REEnergy GmbH
    Inventors: Andreas Bünte, Harald Wertz, Christian Kleinen, Harry Gill
  • Patent number: 9018872
    Abstract: To provide a motor control circuit that variably controls the speed of a motor, in which an appropriate advance angle value corresponding to the speed of the motor that is set can be automatically set. The motor control circuit according to the present invention includes an advance angle setting means that adds a reference advance angle value to an advance angle correction value obtained by multiplying a proportional coefficient by a correction amount and outputs an advance angle setting signal, and an advance angle setting correction means that uses a ratio of a correction reference period relative to a period of a reference signal input from the outside as a correction amount and corrects the reference advance angle value by an advance angle correction value obtained by multiplying the correction amount by a predetermined proportional coefficient of the advance angle setting means.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: April 28, 2015
    Assignees: Minebea Co., Ltd., Panasonic Corporation
    Inventors: Tomohiro Inoue, Yuji Hamada
  • Patent number: 9018882
    Abstract: A Variable Frequency Drive (VFD) supplies power to rotate a motor, controlling both the speed and direction. The method normally used for this power conversion by the VFD results in energy losses and line harmonics. When the motor is driven by the VFD to be rotating at the same speed and direction as if the motor was straight across the incoming AC power, a transfer in power supply to the motor can be made using contactors to bypass the VFD. When in this bypass mode, the energy losses of the VFD are greatly reduced, and the line harmonics due to the VFD are greatly reduced. When it is subsequently recognized that the speed reference has deviated from being the same speed and direction as if the motor was straight across the incoming AC power, a transfer in power supply can be made from using contactors to once again drive the motor from the VFD.
    Type: Grant
    Filed: August 17, 2011
    Date of Patent: April 28, 2015
    Assignee: Yaskawa America, Inc.
    Inventors: Steven Russell Mack, William Charles Phillips, III, Matthew James Schimke
  • Publication number: 20150097505
    Abstract: A current source inverter device according to an embodiment includes an inverter that supplies AC power to a number n (integer of 1 or greater) of AC motors each having a number m (integer of 2 or greater) of windings per phase; and a controller that controls the inverter and AC motor. The inverter includes a switching unit, in which a number n×m+1 of switching elements per phase are connected in series, and a number n×m of nodes among the switching elements are respectively connected with a number n×m of different windings with the same phase among the windings of the number n of the AC motors. The controller includes a mode selector that selects at least one winding as a supply target of the AC power from the number n×m of the windings based on a rotation speed of the AC motor.
    Type: Application
    Filed: October 9, 2014
    Publication date: April 9, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Tsuneo KUME, Hidenori HARA, Katsutoshi YAMANAKA
  • Publication number: 20150097504
    Abstract: In a system that receives power from an electric power grid, a variable frequency AC drive has an output connected to an AC electric motor, and an input connected to the power grid. The motor is in 1 connection with a load, and the AC drive includes an active converter having a predetermined maximum apparent power capacity. The converter is coupled to a controller programmed to regulate reactive power generation and consumption of the variable frequency AC drive so that the drive produces reactive power when the converter is utilizing less than its maximum apparent power capacity. This reactive power is fed to the power grid. A device monitors current and voltage in the power grid and calculates power factor, which is then used as a feedback to an external controller that generates a reactive power reference signal intended to control the system's power factor.
    Type: Application
    Filed: October 9, 2013
    Publication date: April 9, 2015
    Applicant: Harold Wells Associates, Inc.
    Inventors: Craig Lamascus, Lloyd Wentworth
  • Patent number: 9000707
    Abstract: Apparatuses and methods are described for implementing adjustable speed drives. For instance, an apparatus may comprise an inverter circuit configured to drive a multi-phase electrical load, the inverter configured to be powered by first and second direct-current (DC) bus lines, a fan drive circuit configured to be powered by the first and second DC bus lines, a fan configured to be controlled by the fan drive circuit and having a plurality of windings coupled together at an electrical node, a first capacitor having a first terminal coupled to the first DC bus line and a second terminal coupled to the electrical node, and a second capacitor having a first terminal coupled to the second DC bus lines and a second terminal coupled to the electrical node.
    Type: Grant
    Filed: October 16, 2012
    Date of Patent: April 7, 2015
    Assignee: Toshiba International Corporation
    Inventors: Mohammed Arefeen, Mark Rayner
  • Publication number: 20150091487
    Abstract: A method and arrangement for operating a pump system are disclosed, the pump system including a pump arranged to be rotated with an AC motor, an inverter, the output of which is electrically connected to the AC motor, and a photovoltaic panel system electrically connected to feed DC power to the inverter. The method can include setting a voltage limit, and determining continuously voltage obtained from the photovoltaic panel system. When the determined voltage of the photovoltaic panel system is below the set voltage limit, frequency of the inverter can be controlled such that the ratio between output voltage of the inverter and the output frequency is substantially constant. When the determined voltage of the photovoltaic panel system exceeds the voltage limit, the inverter frequency can be controlled for keeping voltage of the photovoltaic panel system substantially at the voltage limit.
    Type: Application
    Filed: September 26, 2014
    Publication date: April 2, 2015
    Applicant: ABB OY
    Inventors: Laxmikantha Shenoy, Ahmed Syed, Chetan Patange, Deepak Pandey, Mikko Lammi, Rahul Raj, Satyan RN
  • Patent number: 8970154
    Abstract: A resonance suppression control block includes a high-pass filter for extracting an AC component of DC link voltage, and a gain section for outputting a correction signal obtained by multiplying the AC component by a gain. A control unit controls an inverter based on a signal obtained by adding the correction signal to the voltage instruction. Thus, a power conversion apparatus with a simple configuration can be obtained that can suppress resonance of a DC link section and omit extra work for performing adjustment again in accordance with a power supply frequency.
    Type: Grant
    Filed: November 1, 2011
    Date of Patent: March 3, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shuta Ishikawa, Shinichi Furutani, Masanori Kato, Yoichi Egashira, Yuki Kawauchi
  • Patent number: 8970148
    Abstract: A filter for reducing radiated emissions in switching power converters such as a motor drive is disclosed. The switching power converter modulates a DC voltage input to generate a desired AC voltage output. Capacitors are connected in parallel between each output phase and a common connection, which may be a ground connection. The magnitude and layout of the capacitors are selected to minimize current conducted by the capacitors. The capacitors may be surface mount technology located proximate to the switching devices or the capacitors may be incorporated in the circuit board on which the switching devices are mounted. The filter may be applied to any of the switching elements in a motor drive, such as the inverter section, an active rectifier section, or a switched mode power supply.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: March 3, 2015
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Zoran Vrankovic, Craig Winterhalter, Gary Skibinski
  • Publication number: 20150048769
    Abstract: A motor control system is disclosed. The motor control system includes a level-shifting unit, a motor unit and a control unit. The level-shifting unit receives an original pulse width modulation (PWM) signal to generate an output PWM signal. When a first high level of the original PWM signal is larger than a first reference value, the level-shifting unit shifts a second high level of the output PWM signal to a set high level. When a first low level of the original PWM signal is lower than a second reference value, the level-shifting unit shifts a second low level of the output PWM signal to a set low level. The control unit controls the speed of the motor according to the output PWM signal.
    Type: Application
    Filed: July 14, 2014
    Publication date: February 19, 2015
    Inventors: Chia-Hao CHANG, Yueh-Lung HUANG, Yen-Hung CHEN, Shih-Yuan CHIANG, Feng-Ying LIN
  • Publication number: 20150035468
    Abstract: The invention relates to a method of control implemented in a variable speed drive, said method comprising the following steps of: for a switching of a transistor (100) of the rectifier stage (1), determination of a first control signal (Ce) corresponding to a first gate current (Ige) to be applied to the gate of the transistor to be switched so as to act on the rate of the variation of a first voltage (Vrec) generated by the switching, for a switching of a transistor (200) of the inverter stage (2), determination of a second control signal (Cs) corresponding to a second gate current to be applied to the gate of the transistor to be switched so as to act on the rate of the variation of a second voltage (Vine) generated by the switching, determination of a first instant of switching (te) of the transistor of the rectifier stage and of a second instant of switching (ts) of the transistor of the inverter stage (2), the first control signal (Ce), the second control signal (Cs), the first instant of switching a
    Type: Application
    Filed: July 9, 2014
    Publication date: February 5, 2015
    Applicant: Schneider Toshiba Inverter Europe SAS
    Inventors: Yves-Laurent ALLAERT, Mehdi Messaoudi, Hocine Boulharts
  • Publication number: 20150035467
    Abstract: The invention comprises a high frequency inductor filter apparatus coupled with an inverter yielding high frequency harmonics and/or non-sixty Hertz output. For example, an inductor/converter apparatus is provided that uses a silicon carbide transistor to output power having a carrier frequency, modulated by a fundamental frequency, and a set of harmonic frequencies. A filter, comprising an inductor having a distributed gap core material and optional magnet wires, receives power output from the inverter/converter and processes the power by passing the fundamental frequency while reducing amplitude of the harmonic frequencies.
    Type: Application
    Filed: July 30, 2013
    Publication date: February 5, 2015
    Applicant: CTM Magnetics, Inc.
    Inventor: Grant A. MacLennan
  • Publication number: 20150008860
    Abstract: An apparatus for modifying voltage command for detecting output current in inverter is disclosed to modify a PWM voltage command by determining a sector in a voltage hexagon, the sector having a PWM voltage command therein, by comparing the PWM voltage command, determining an area, the area having the PWM voltage command, within a current detection disabled area by converting a minimum sampling time to a minimum sampling PWM and using the converted minimum sampling PWM, and determining an adjusting voltage and a restoring voltage using a minimum injection voltage based on the determined area.
    Type: Application
    Filed: June 20, 2014
    Publication date: January 8, 2015
    Applicant: LSIS CO., LTD.
    Inventor: Eun Woo LEE
  • Patent number: 8928268
    Abstract: There are provided a signal duty detecting apparatus detecting a duty of a pulse width modulation (PWM) signal by counting a signal, among signals present in a preset period of the PWM signal, having a predetermined level or higher and a motor driving apparatus having the same. The signal duty detecting apparatus includes: a level detector detecting levels of an input signal; a counter counting the levels detected by the level detector; and a duty calculator calculating a duty of the input signal based on the levels counted by the counter.
    Type: Grant
    Filed: August 14, 2012
    Date of Patent: January 6, 2015
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Bon Young Koo
  • Publication number: 20150002068
    Abstract: Systems for controlled resonance in electrical power devices are described. A programmed signal processor generates output control signals from input electrical signals based on resonant control parameters for a target power device. Analog electrical control systems for controlled resonance, power devices incorporating controlled resonance, and opto-programmed controllers for use in controlled resonance applications are described, with example embodiments for electro-mechanical systems with resonant constructive power drive action for electric motors.
    Type: Application
    Filed: January 4, 2013
    Publication date: January 1, 2015
    Inventors: Ormonde G. Durham, Edward E. Lakata
  • Publication number: 20150002067
    Abstract: Motor drives and control methods are presented for sensorless motor speed control in which inverter output currents are sampled from the inverter output and a frequency modulation value is determined based on the current feedback. A speed or frequency setpoint is adjusted at least partially according to the frequency modulation value to provide an adjusted frequency or speed setpoint value that is then used in controlling the inverter to provide stability control to mitigate hunting or motor stoppage.
    Type: Application
    Filed: February 28, 2014
    Publication date: January 1, 2015
    Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.
    Inventors: Thomas Nondahl, Jingbo Liu, Peter Schmidt, Semyon Royak, Timothy M. Rowan
  • Patent number: 8917047
    Abstract: The present disclosure discloses a converter system, which at least includes the first and second back-to-back converters. The first back-to-back converter includes a first rectifier module and a first inverter module. The first rectifier module is used to convert a first AC voltage to a first DC voltage. The first inverter module is used to convert the first DC voltage to a second AC voltage. The second back-to-back converter includes a second rectifier module and a second inverter module. The second rectifier module is used to convert the first AC voltage to a second DC voltage. The second inverter module is used to convert the second DC voltage to the second AC voltage. The converter system can suppress the circular current through the synchronous operation of the first and second rectifiers or the synchronous operation of the first and second inverters.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: December 23, 2014
    Assignee: Delta Electronics, Inc.
    Inventors: Lin Li, Jing-Tao Tan, Hong-Yang Wu
  • Patent number: 8917046
    Abstract: A device for generating electric power of a traction system of a motor vehicle powered by a battery, including a first rectifier stage configured to be connected to a power supply network or to a load to be powered, a second inverter stage configured to be connected to the battery, a mechanism regulating average current flowing between the first stage and the second stage, and a controller controlling a transfer of electric power between the power supply network and the battery or the powering of a load.
    Type: Grant
    Filed: June 16, 2010
    Date of Patent: December 23, 2014
    Assignee: Renault S.A.S.
    Inventors: Benoit Briane, Serge Loudot
  • Patent number: 8917048
    Abstract: A motor control device and a motor control method are disclosed herein, where the motor control device includes a signal conversion unit, a frequency multiplication unit, a profile generation circuit and a frequency converter unit. The signal conversion unit receives a rotation speed signal from a motor and converts the rotation speed signal into a digital signal. The frequency multiplication unit generates a frequency multiplication signal based on the digital signal. The profile generation circuit performs frequency division on the frequency multiplication signal to get a profile signal. The frequency converter unit generates a reference signal and compares the reference signal with the profile signal to output a motor control signal.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: December 23, 2014
    Assignee: Delta Electronics, Inc.
    Inventor: Yueh-Lung Huang
  • Publication number: 20140354207
    Abstract: A PWM output apparatus includes a calculating circuit configured to calculate an output width of a PWM output signal of a first signal and a second signal, which have phases different from each other, based on a command value of a PWM output. A comparing circuit compares the output width and a reference period which is set longer than a predetermined dead time period. A PWM output signal generating circuit outputs the PWM output signal to a dead time inserting block as a corrected PWM output signal, when a set/clear signal generating circuit outputs the set signal, and carries out a correction of setting the first signal of the PWM output signal to be inactive to output to the dead time inserting block as the corrected PWM output signal, when the set/clear circuit outputs the clear signal. The dead time inserting block corrects the corrected PWM output signal.
    Type: Application
    Filed: August 20, 2014
    Publication date: December 4, 2014
    Inventor: Masahiro MINAMI
  • Publication number: 20140333247
    Abstract: An apparatus with reduced torque ripple is disclosed. The apparatus includes a back electromotive force (BEMF) detector, a harmonic identifier, and a compensator circuit. The BEMF detector is configured to detect a BEMF voltage waveform. The harmonic identifier is configured to receive the BEMF voltage waveform and is further configured to identify at least one harmonic contributing to a torque ripple. The compensator circuit is configured to compensate for the at least one harmonic to reduce the torque ripple.
    Type: Application
    Filed: May 10, 2013
    Publication date: November 13, 2014
    Applicant: Seagate Technology LLC
    Inventor: John Freeman