Including Inverter Patents (Class 318/801)
  • Publication number: 20130113412
    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: Application
    Filed: December 28, 2012
    Publication date: May 9, 2013
    Applicants: FUJI ELECTRIC CO., LTD., HONDA MOTOR CO., LTD., SHARP KABUSHIKI KAISHA
    Inventors: FUJI ELECTRIC CO., LTD., SHARP KABUSHIKI KAISHA, HONDA MOTOR CO., LTD.
  • Patent number: 8436573
    Abstract: A power conversion device includes a first inverter circuit and a second inverter circuit, a capacitor, and a microcomputer. The microcomputer switches a control operation, according to the steering state of a steering wheel, between a first state where a first duty center value is shifted to be lower than an output center value and a second duty center value is shifted to be higher than the output center value, and a second state where the first duty center value is shifted to be higher than the output center value and the second duty center value is shifted to be lower than the output center value. This can reduce a difference in heat loss between FETs while reducing the ripple current of the capacitor.
    Type: Grant
    Filed: January 25, 2012
    Date of Patent: May 7, 2013
    Assignee: Denso Corporation
    Inventors: Nobuhiko Uryu, Takashi Suzuki
  • Patent number: 8432116
    Abstract: In a torque motor driving device for wire cut electrical discharge machines, a voltage waveform rectified by a full-wave rectifying circuit, not using a high-capacitance electrolytic capacitor, is applied as an AC voltage to a single-phase torque motor by a bridge circuit including semiconductor switches. A PWM signal whose duty is adjusted so that the current flowing through the torque motor matches an instructed value is generated and the generated PWM signal is used for the operation of the bridge circuit.
    Type: Grant
    Filed: March 2, 2011
    Date of Patent: April 30, 2013
    Assignee: Fanuc Corporation
    Inventors: Tomoyuki Furuta, Akiyoshi Kawahara, Masao Murai
  • Patent number: 8427091
    Abstract: A drive with heat dissipation and energy-saving function for supplying power to drive a motor. The drive includes a driving circuit having a rectification section. The rectification section serves to receive AC current generated when the motor abruptly accelerates/decelerates and convert the AC current into DC current and output the DC current. The drive further includes a cooling module electrically connected to an output end of the rectification section. The cooling module is drivable by the DC current output from the rectification section to conduct out and dissipate heat.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: April 23, 2013
    Assignee: Hiwin Mikrosystem Corp.
    Inventors: Chi-Yuan Cheng, Ming Fu Tsai
  • Patent number: 8421397
    Abstract: A system for controlling operation of a motor drive during fast start-up of an induction motor is disclosed. The system includes an AC motor drive having a PWM inverter and a control system to generate a command signal to cause the PWM inverter to control an output of the AC motor drive. The control system includes a start-up modulator that is selectively operable during start-up acceleration of the AC motor, the start-up modulator programmed to determine a motor current applied to the AC motor and a voltage of a DC bus, generate a first frequency offset that causes a frequency reference of the command signal to be decreased when the motor current is greater than a reference current threshold, and generate a second frequency offset that causes the frequency reference of the command signal to be increased when the DC bus voltage is greater than a reference voltage threshold.
    Type: Grant
    Filed: April 11, 2011
    Date of Patent: April 16, 2013
    Assignee: Eaton Corporation
    Inventors: Anbo Yu, Lei Zhang, Kevin Lee
  • Patent number: 8421398
    Abstract: An autonomous controller allows an AC induction motor to operate over a broad range of AC power supply frequencies by reducing the amount of current supplied to the motor at lower frequencies. The controller detects the frequency of the power supply and switches the supply current on and off during each AC cycle to limit the RMS current to a value that is related to the detected frequency. Alternatively, the controller switches capacitive reactance into the power supply circuit which reduces the current supplied to the motor at lower AC frequencies.
    Type: Grant
    Filed: February 16, 2010
    Date of Patent: April 16, 2013
    Assignee: The Boeing Company
    Inventors: Robert E. Fisher, John T. Paterson
  • Patent number: 8415905
    Abstract: A battery power system, adapted for driving a motor system of a power unit with respect to at least one power mode signal and at least one motor control signal generated from the motor system, which comprises: a battery pack, an electrolytic capacitor, a boost converter, a first contactor, a first switch, an ultracapacitor, a first diode, a second contactor, a second switch, a current limiting element, a plurality of measuring elements, and an electrical energy controller; wherein the electrical energy controller is enabled to analyze the electrical power level of the ultracapacitor according the power mode signal, the motor control signal and the voltage/current signals generated from the plural measuring elements while using the result of the analysis to control the current directions and conductivity of the boost converter, the first contactor, the second contactor, the first switch and the second switch so as to achieve a variety of control modes accordingly.
    Type: Grant
    Filed: April 29, 2011
    Date of Patent: April 9, 2013
    Assignee: Industrial Technology Research Institute
    Inventors: Wu-Yang Sean, Yi-Hsien Chiang
  • Patent number: 8415908
    Abstract: A driving apparatus drives a brushless motor that includes a plurality of windings. The apparatus comprises a plurality of switch half-bridges connected to a power line and to the windings, a memory adapted to contain a plurality of signal profiles to be cyclically applied to the plurality of windings of the motor, a multiplier for multiplying the profile values of the signals from the memory by a scale factor, a control circuit adapted to generate PWM signals for the switches of the plurality of switch half-bridges according to values output by the multiplier, a polarity detector configured to detect the polarity of the current passing trough at least one winding of the motor and a scale factor controller configured to modify the scale factor according to the detected current polarity and so as to make each signal profile to be applied to each winding of the motor either higher than the back-electromotive force or equal to the back-electromotive force generated by the motor.
    Type: Grant
    Filed: December 15, 2010
    Date of Patent: April 9, 2013
    Assignee: STMicroelectronics S.r.l.
    Inventor: Ezio Galbiati
  • Patent number: 8415914
    Abstract: An electric power supply system has a power bus for providing DC power, and a control unit for a source of power to supply the power bus. The power unit includes a damping algorithm to provide damping to power supplied on the power bus. A motor and a motor control include a compensation block for tapping power from the bus, and identifying a portion of a supplied signal due to the damping. The compensation block provides a signal to a summing block that addresses the damping on the power bus prior to the power being supplied to the motor. A method of utilizing such a system is also disclosed.
    Type: Grant
    Filed: January 13, 2010
    Date of Patent: April 9, 2013
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Donal E. Baker, Raymond J. Beckmann, Curtis J. Plude
  • Patent number: 8410736
    Abstract: The present invention discloses a controllable rectification comprising an inverter (10), a control panel (20) and a drive panel (30). The inverter (10) may comprise three switch element groups connected in parallel. Each switch element group may comprise at least two switch elements connected in parallel. Each switch element may comprise an upper bridge-arm switch and a lower bridge-arm. The control panel (20) may generate a PWM waveform. The drive panel (30) may generate a drive voltage according to the PWM waveform to drive the upper bridge-arm switch and the lower bridge-arm switch of each switch element to conduct or break respectively, and to make the upper bridge-arms of the same switch element group to conduct or break simultaneously, and to make the lower bridge-arms of the same switch element group to conduct or break simultaneously. The present invention further discloses an electric motor comprising the same.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: April 2, 2013
    Assignee: BYD Company Limited
    Inventor: Xianhong Jiang
  • Patent number: 8410744
    Abstract: During motor acceleration control period that starts at time T1, if power supply output or supply current exceeds a predetermined level at time T2, PWM control in a PWM converter is turned off until a deceleration control period of T3 to T4 ends. As a result, DC link voltage (voltage of a power storage device) at the start of the deceleration control at time T3 drops to provide space for storing regenerative power; since the PWM control in the PWM converter is off during the deceleration control period, the regenerative power can be stored into the power storage device and reused in the next control cycle.
    Type: Grant
    Filed: August 23, 2011
    Date of Patent: April 2, 2013
    Assignee: FANUC Corporation
    Inventors: Yasusuke Iwashita, Shinichi Horikoshi, Takashi Harada, Masakazu Niwa, Koujirou Sakai
  • Patent number: 8410746
    Abstract: The present invention provides an inverter circuit for a vehicle, which includes: a switching unit that includes a plurality of switching elements and switches a direct current into an alternating current; and a variable clamping unit that clamps an overshoot in case the overshoot is generated, and stops the operation of the switching unit in case a system voltage is greater than a clamping breakdown voltage. The circuit enables a voltage (DC input voltage) greater than a breakdown voltage of clamping unit to be used as a system voltage.
    Type: Grant
    Filed: October 15, 2009
    Date of Patent: April 2, 2013
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Jeong Yun Lee, Sung Kyu Kim, Jae Won Lee, Tae Hwan Chung, Ki Young Jang, Jung Hong Joo
  • Patent number: 8410745
    Abstract: When a short-circuit failure of any of switch portions (13) including switch elements (11) and parallel-connected feedback diodes (12) of an inverter circuit (7) is detected during the operation of a motor (1), a switch portion (13) where the short-circuit failure has occurred is checked for whether it is on the positive polarity side or the negative polarity side. The switch elements (11) are so controlled that all the switch portions (13) on the same polarity side as where the short-circuit has occurred are brought into a conducted state and all the others are disconnected. This prevents a large electric current from flowing into each switch portion of the inverter circuit without requiring any switch to block the power distribution between a motor and the inverter circuit when a short-circuit failure of the switch portion of the inverter circuit occurs.
    Type: Grant
    Filed: February 18, 2008
    Date of Patent: April 2, 2013
    Assignee: Honda Motor Co., Ltd.
    Inventors: Masaharu Hosoda, Yuji Saito, Yasuyuki Danjo, Hideki Inoue, Tetsu Sugiyama, Junji Kato
  • Patent number: 8405343
    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: May 19, 2011
    Date of Patent: March 26, 2013
    Assignees: Fuji Electric Systems Co., Ltd., Honda Motor Co., Ltd., Sharp Kabushiki-Kaisha
    Inventors: Hitoshi Sumida, Akinobu Teramoto, Ken-ichi Nonaka, Toshio Naka
  • Patent number: 8405342
    Abstract: A motor including a stator, a rotor, and a current supply unit. The stator includes a stator core, which has a plurality of teeth, and a plurality of coils, which are wound around the teeth. The rotor includes a plurality of magnets, which function as first magnetic poles, and salient poles, which function as second magnetic poles. Each of the salient poles is arranged between adjacent magnets spaced apart by a clearance from the magnets. When P represents the number of poles in the rotor and S represents the number of coils, a ratio P/S of the pole number P and the coil number S is represented by (4n?2)/3m (where n and m are integers that are greater than or equal to 2). The plurality of coils includes a plurality of coil groups including coils for three phases. The current supply unit executes a different current control for each coil groups.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: March 26, 2013
    Assignee: Asmo Co., Ltd.
    Inventors: Yoji Yamada, Shinji Santo, Seiya Yokoyama, Yoko Tateishi, Yoshiaki Takemoto, Shigemasa Kato
  • Patent number: 8405344
    Abstract: A method is disclosed for estimating a rotation speed of an electric motor supplied by an inverter, by determining a time derivative of a stator current vector of the electric motor during a zero vector state of the inverter; and determining an estimate of the rotation speed of the electric motor on the basis of the determined time derivative of the stator current vector.
    Type: Grant
    Filed: November 12, 2009
    Date of Patent: March 26, 2013
    Assignee: ABB Oy
    Inventor: Samuli Heikkilä
  • Patent number: 8390241
    Abstract: An inverter for driving a motor includes one or more power stages for producing one or more power signals for energizing the motor, each power stage including first and second III-nitride based bi-directional switching devices connected in series between a DC voltage bus and ground.
    Type: Grant
    Filed: January 19, 2011
    Date of Patent: March 5, 2013
    Assignee: International Rectifier Corporation
    Inventors: Mario Battello, Stephen Oliver
  • Patent number: 8384338
    Abstract: A system and method for determining the stator winding resistance of AC motors is provided. The system includes an AC motor drive having an input connectable to an AC source and an output connectable to an input terminal of an AC motor, a pulse width modulation (PWM) converter having switches therein to control current flow and terminal voltages in the AC motor, and a control system connected to the PWM converter. The control system generates a command signal to cause the PWM converter to control an output of the AC motor drive corresponding to an input to the AC motor, selectively generates a modified command signal to cause the PWM converter to inject a DC signal into the output of the AC motor drive, and determines a stator winding resistance of the AC motor based on the DC signal of at least one of the voltage and current.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: February 26, 2013
    Assignee: Eaton Corporation
    Inventors: Bin Lu, Thomas G. Habetler, Pinjia Zhang
  • Patent number: 8384336
    Abstract: A multiphase motor driving device has an inverter circuit. The inverter circuit includes a pair of upper and lower switching elements, a shunt resistor for phase current detection, and a voltage for driving a multiphase motor. The device includes a determination unit for shifting a detection timing of the current flowing to the shunt resistor from the OFF period to the ON period of the switching element on the upper side in the phase. The determination unit determines whether or not ON failure occurs based on the current flowing to the shunt resistor of the phase in the ON period. The device has a current value estimation unit for estimating a current value of the phase in a case where the detection timing is shifted based on currents flowing to the shunt resistors of other phases.
    Type: Grant
    Filed: September 25, 2009
    Date of Patent: February 26, 2013
    Assignee: Omron Automotive Electronics Co., Ltd.
    Inventor: Keita Gunji
  • Patent number: 8384337
    Abstract: A conveyor system includes an electric motor to move a conveyor. A voltage determining device is coupled to an alternating-electricity source that supplies alternating electricity to the conveyor system. A power supply appliance supplies power between the electric motor and the alternating-electricity source. The power supply appliance includes an inverter and an inverter control. The inverter includes a rectifying bridge and a motor bridge. The rectifying bridge input is coupled to the alternating-electricity source and the rectifying bridge output is coupled to the motor bridge input. The motor bridge output is coupled to the electric motor. The inverter control is coupled between the voltage determining device and the motor bridge. The inverter control is responsive to frequency and phase of the determined voltage of the alternating-electricity source to adjust the frequency and phase of the motor bridge output voltage such that the motor bridge output voltage is made to be essentially constant.
    Type: Grant
    Filed: September 2, 2010
    Date of Patent: February 26, 2013
    Assignee: Kone Corporation
    Inventor: Pekka Jahkonen
  • Patent number: 8384335
    Abstract: A motor driving apparatus comprises: an AC/DC converter which converts AC voltage supplied from an AC power source into DC voltage through PWM switching control of a power switching device; and a DC/AC converter which converts the DC voltage into variable-frequency AC voltage for driving a motor in a controlled manner. The AC/DC converter includes: a control unit which generates, based on an error between the DC voltage and a DC voltage command value, a PWM signal for the PWM switching control of the power switching device; and a frequency/gain varying unit which sets the frequency of the PWM signal to be generated by the control unit and a control gain in the control unit higher than their normal levels during a period in which a load in the DC/AC converter varies.
    Type: Grant
    Filed: August 12, 2011
    Date of Patent: February 26, 2013
    Assignee: FANUC Corporation
    Inventors: Wataru Kuroki, Takashi Harada, Shinichi Horikoshi, Yasusuke Iwashita
  • Patent number: 8378608
    Abstract: Certain exemplary embodiments can provide a system, machine, device, manufacture, circuit, and/or user interface adapted for, and/or a method and/or machine-readable medium comprising machine-implementable instructions for, activities that can comprise, via a predetermined information device, for a predetermined excavating machine comprising a plurality of Active Front Ends, each Active Front End electrically coupled to an AC power supply network of said predetermined excavating machine, each Active Front End adapted to provide DC power to a DC bus, said DC bus electrically coupled to a plurality of inverters, each inverter adapted to supply AC power to at least one operating motor, independently controlling a reactive power produced by each Active Front End.
    Type: Grant
    Filed: September 22, 2009
    Date of Patent: February 19, 2013
    Assignee: Siemens Industry, Inc.
    Inventor: Daniel W. Robertson
  • Patent number: 8369049
    Abstract: A method for shutting down an electric machine having a pulse-controlled inverter in the event of a malfunction. Undesirable side effects during shut-down of the electric machine may be minimized and the regular machine operation may be maximized when the electric machine is first switched to a disconnect mode in which all switches of the pulse-controlled inverter are open and subsequently is switched to a short-circuit mode in which the switches connected to the high potential are open and the switches connected to the low potential are closed.
    Type: Grant
    Filed: January 19, 2007
    Date of Patent: February 5, 2013
    Assignee: Robert Bosch GmbH
    Inventors: Jochen Kuehner, Martin Trunk, Klaus Rechberger, Manfred Ackermann, Manfred Stahl
  • Patent number: 8368342
    Abstract: An apparatus for generating electromagnetic torque in an N-phase electric machine, N being a positive integer, includes N lines, each of the N lines including an input terminal, an output terminal, and a pair of thyristors, or of one thyristor and one diode pair. The N lines are connected between a mains and the electric machine. An apparatus is provided for repeatedly or continuously determining at least the sign of a voltage over the thyristor or diode-thyristor pair in at least one of the N lines, means are provided for repeatedly or continuously determining at least one parameter related to the electromagnetic field in the electric machine, and a control device is provided for controlling the operation of the thyristor or diode-thyristor pair of the at least one of the N lines.
    Type: Grant
    Filed: May 10, 2012
    Date of Patent: February 5, 2013
    Assignee: ABB Research Ltd.
    Inventor: Pierluigi Tenca
  • Patent number: 8362735
    Abstract: A device for improving efficiency of an induction motor that soft-starts the motor by applying a voltage to the motor that is substantially less than the rated voltage then gradually increasing the voltage 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 voltage to the motor is increased/decreased by measuring the phase angle between the voltage and the current to the motor and increasing the voltage when the phase angle is less than a minimum phase angle (determined during soft-start) and decreasing the voltage 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: March 7, 2011
    Date of Patent: January 29, 2013
    Assignee: Protective Energy Economizer Technology
    Inventor: Mario M. Marcoccia
  • Patent number: 8362733
    Abstract: A motor drive system includes: a three-phase motor; a power conversion device that supplies power for driving the three-phase motor; and an output filter that is arranged between an output of the power conversion device and the three-phase motor and has a configuration in which a setting value of a filter resonance frequency is selectable and changeable.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: January 29, 2013
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Aiko Inuduka, Tsuyoshi Higuchi
  • Patent number: 8362725
    Abstract: A motor control system for heating, ventilation, and air conditioning (HVAC) applications is described. The motor control system includes a thermostat and an electronically commutated motor (ECM) coupled to the thermostat. The ECM is configured to retrofit an existing non-ECM electric motor included in an HVAC application and to operate in one of a plurality of HVAC modes. The HVAC modes include at least one of a heating mode, a cooling mode, and a continuous fan mode. The HVAC mode is determined based at least partially on outputs provided by the thermostat.
    Type: Grant
    Filed: March 5, 2012
    Date of Patent: January 29, 2013
    Assignee: RBC Manufacturing Corporation
    Inventors: Roger C. Becerra, Steven A. Nardin, Michael R. Koller, Andrew C. Barry, Brian L. Beifus, Andrew M. Knollman
  • Patent number: 8362759
    Abstract: A phase current prediction method is disclosed. The phase current prediction method predicts current representative of a PWM period using a motor model which receives current measured through a single current sensor as an input, instead of the measured current, and determines the predicted current to be phase current.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: January 29, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jung Ik Ha, Jong Ho Kim, Ho Sun Yoo, Hyung Sun You, Jang Hwan Kim
  • Patent number: 8353174
    Abstract: A chiller system is provided with a compressor, a condenser, and an evaporator connected in a closed refrigerant loop. A motor is connected to the compressor to power the compressor. A variable speed drive is connected to the motor. The variable speed drive is arranged to receive an input AC power at a fixed input AC voltage and a fixed input frequency and provide an output power at a variable voltage and variable frequency to the motor. The variable voltage has a maximum voltage greater in magnitude than the fixed input AC voltage and the variable frequency has a maximum frequency greater than the fixed input frequency. The variable speed drive includes a converter connected to an AC power source providing the input AC voltage, the converter is arranged to convert the input AC voltage to a DC voltage. A DC link is connected to the converter. The DC link is arranged to filter and store the DC voltage from the converter. An inverter is connected to the DC link.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: January 15, 2013
    Assignee: Johnson Controls Technology Company
    Inventors: Ivan Jadric, Zhiqiao Wu, Michael S. Todd, Justin Drew Warner, Shreesha Adiga Manoor, Konstantin Borisov, Scott Victor Slothower, Kanishk Dubey, John C. Hansen
  • 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: 8339084
    Abstract: Systems and methods are provided for monitoring current in an electric motor. An electrical system comprises a direct current (DC) interface, an electric motor, and an inverter module between the DC interface and the electric motor. A first current sensor is configured to measure a DC current flowing between the DC interface and the inverter module. A second current sensor is configured to measure a first phase current flowing through the first phase of the electric motor. A control module is coupled to the current sensors, and the control module is configured to determine an expected value for the first phase current based at least in part on the DC current measured by the first current sensor and take remedial action based on a difference between the expected value and the measured first phase current.
    Type: Grant
    Filed: March 12, 2010
    Date of Patent: December 25, 2012
    Assignee: GM Global Technology Operations LLC
    Inventor: Brian A. Welchko
  • Patent number: 8339090
    Abstract: An apparatus operable in a wet environment includes a voltage doubler circuit including a pair of diodes, a pair of direct current switching elements connected between the respective diodes and a common point, a controller, an interface connected to the controller for receiving external status signals, and a switching arrangement responsive to signals from the controller to select the full power mode or a controlled power mode. In the controlled power mode, the switching elements are switched in a predetermined sequence such that only one of the switching elements conducts current during any one half cycle of the AC output voltage applied to the motor.
    Type: Grant
    Filed: September 7, 2010
    Date of Patent: December 25, 2012
    Assignee: Sequence Controls Inc.
    Inventor: Dale A. Van Spengen
  • Patent number: 8339074
    Abstract: Generation voltage control or generation torque control is performed as suitable control based on an external command or a load of a generator motor, to thereby prevent a rapid change of a generation torque or excessive power generation. A power converter control apparatus includes: a power conversion unit including a bridge circuit for controlling energization of an armature winding and a field circuit for controlling energization of a field winding; and a control device including B-terminal voltage detection means, field current detection means, generation voltage control means, generation torque control means, and control selection means. The control selection means selects the one of the generation voltage control means and the generation torque control means based on one of a command from an outside and a load of the generator motor.
    Type: Grant
    Filed: June 16, 2010
    Date of Patent: December 25, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kenji Nakajima, Masato Mori, Kenichi Akita, Mitsunori Tabata
  • 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: 8319461
    Abstract: The present invention relates to a method and a system for controlling a permanent magnet excited, brushless, electronically commutated, three-phase electric motor (2) wherein a single-phase main AC voltage (UN) having a mains frequency (fN) is rectified and supplied to an inverter (8) via a slender intermediate circuit (6) containing no, or minimum, intermediate circuit reactance as intermediate circuit voltage (Uz) pulsating at double the mains frequency (2fN) which is actuated for powering and commutating the electric motor (2). Control takes place by means of a field-oriented current-space vector regulator, wherein a q-current (iq) as torque-forming component of the current-space vector (i) is regulated perpendicularly to the permanent magnetic field and a d-current (id) can be regulated as a field-influencing component of the current-space vector (i) in the direction of the permanent magnet field.
    Type: Grant
    Filed: July 12, 2010
    Date of Patent: November 27, 2012
    Assignee: EBM-Papst Mulfingen GmbH & Co. KG
    Inventors: Ralph Wystup, Helmut Lipp
  • Patent number: 8310197
    Abstract: A control device that includes an AC voltage command determination section that determines an AC voltage command value, which is a command value of the AC voltage supplied from the DC/AC conversion section to the AC electric motor, on the basis of a target torque of the AC electric motor and a rotational speed of the AC electric motor; and a system voltage command determination section that determines a system voltage command value, which is a command value of the system voltage generated by the voltage conversion section, on the basis of the AC voltage command value and the system voltage.
    Type: Grant
    Filed: April 7, 2010
    Date of Patent: November 13, 2012
    Assignee: Aisin Aw Co., Ltd.
    Inventors: Zhiqian Chen, Peng He
  • Patent number: 8310196
    Abstract: A method and an apparatus for the failsafe monitoring of an electromotive drive without additional sensors, including a drive having a three-phase control of an electric motor, detection of the current and voltage profiles of each of the three phases, as they are forwarded to the motor by drive electronics, determination of the load speed while using the detected current and voltage values, where the determination of the load speed takes place by calculating an observer model with reference to the detected current, to the detected voltage, to the frequency preset by the control and to the characteristic data of the motor and generation of a failsafe switch signal for the motor when the calculated load speed does not correspond to a preset desired speed within the framework of preset tolerances. The load torque can also be determined and monitored with reference to the observer model.
    Type: Grant
    Filed: October 27, 2010
    Date of Patent: November 13, 2012
    Assignee: Sick AG
    Inventor: Mathias Ams
  • Patent number: 8305027
    Abstract: An electric compressor control device includes: an inverter for electric compressor motor; a communication microcontroller arranged in a low-voltage region for transmission of an instruction signal via a high-speed communication bus; and a control microcontroller arranged in a high-voltage region and connected to the communication microcontroller via an insulation element for transmitting the instruction signal from the communication microcomputer as an inverter control signal to the inverter. The power voltage of the communication microcomputer is supplied from a low-voltage power source. The voltage from the low-voltage power source is transformed via a transformer and supplied as a power voltage of the control microcontroller.
    Type: Grant
    Filed: May 27, 2008
    Date of Patent: November 6, 2012
    Assignee: Sanden Corporation
    Inventor: Makoto Shibuya
  • Patent number: 8299762
    Abstract: A pre-charge circuit limits in-rush currents on a direct current (DC) link that includes a first DC link bus and a second DC link bus. The pre-charge circuit includes a switching device connected in series with the first DC link bus. The switching device has an ON state in which power flow is enabled on the DC link and an OFF state in which power is disabled on the DC link. A controller selectively modulates the state of the switching device to limit in-rush currents on the DC link.
    Type: Grant
    Filed: June 5, 2009
    Date of Patent: October 30, 2012
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Gregory I. Rozman, Matthew L. Wilhide
  • Patent number: 8299743
    Abstract: A machine tool a tool includes a supporting member relatively movable to a workpiece along a predetermined axis, a servo motor configured to drive the tool supporting member to the workpiece along the predetermined axis, a sizing sensor configured to measure a profile of the workpiece and to output a size deviation of measured values from a target profile, and a position detector configured to detect at least one of a relative position of the tool supporting member to the workpiece and a rotational position angle of the servo motor. The a servo driver is configured to drive the servo motor, and has a first feedback control having an output based on the size deviation, and a second feedback control based on an output of the position detector. The servo drives the servo motor by combining the outputs of the first and second feedback controls.
    Type: Grant
    Filed: January 12, 2010
    Date of Patent: October 30, 2012
    Assignee: JTEKT Corporation
    Inventors: Satoshi Abeta, Toshihiro Yonezu
  • Patent number: 8299646
    Abstract: An HVAC/R system is configured with a variable frequency drive power supply which provides power to each of a compressor, a condenser fan, and a blower. In some embodiments, the compressor has a three-phase motor and the condenser fan has a single-phase motor.
    Type: Grant
    Filed: July 27, 2009
    Date of Patent: October 30, 2012
    Assignee: Rocky Research
    Inventors: Uwe Rockenfeller, Paul Sarkisian, Kaveh Khalili, Warren Harhay
  • Patent number: 8299653
    Abstract: An HVAC/R system is configured with a variable frequency drive power supply which provides power to both a three-phase motor and to a single-phase motor. In some embodiments, the three-phase motor is a compressor motor and the single-phase motor is a condenser fan motor.
    Type: Grant
    Filed: July 27, 2009
    Date of Patent: October 30, 2012
    Assignee: Rocky Research
    Inventors: Uwe Rockenfeller, Paul Sarkisian, Kaveh Khalili, Warren Harhay
  • Patent number: 8294410
    Abstract: A method and an apparatus for the failsafe monitoring of an electromotive drive without additional sensors, including a drive having a three-phase control of an electric motor, detection of the current and voltage profiles of each of the three phases, as they are forwarded to the motor by drive electronics, determination of the load speed while using the detected current and voltage values, where the determination of the load speed takes place by calculating an observer model with reference to the detected current, to the detected voltage, to the frequency preset by the control and to the characteristic data of the motor and generation of a failsafe switch signal for the motor when the calculated load speed does not correspond to a preset desired speed within the framework of preset tolerances. The load torque can also be determined and monitored with reference to the observer model.
    Type: Grant
    Filed: October 4, 2010
    Date of Patent: October 23, 2012
    Assignee: Sick AG
    Inventor: Mathias Ams
  • Patent number: 8294411
    Abstract: A sensorless induction motor control device with a function of correcting a slip frequency wherein a slip frequency estimation unit estimates the slip frequency from at least one kind of current flowing through the motor. A voltage command value calculation unit calculates a D-phase voltage command value and a Q-phase voltage command value which are used for controlling a voltage applied to the motor using a Q-phase current command value calculated based on a difference between a speed estimation value, which is calculated using an estimation value of the slip frequency, and an externally supplied speed command value. An ideal voltage command value determination unit determines an ideal voltage command value using the speed command value and the Q-phase current command value. An actual voltage command value calculation unit calculates an actual voltage command value using the D-phase voltage command value and the Q-phase voltage command value.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: October 23, 2012
    Assignee: Fanuc Corporation
    Inventors: Tadashi Okita, Takahiro Akiyama, Tomohisa Tsutsumi
  • Patent number: 8284575
    Abstract: A drive system has a low voltage system, a high voltage system, and a transformer. The high voltage system has drive units which correspond to power switching elements. A capacitance in the high voltage system serves as a flouting power source which supplies electric power to each of the drive units. An output voltage of a secondary side coil of the transformer is supplied to the capacitance. A comparator compares the output voltage at the secondary side coil of the transformer with a threshold value. A switching speed change part changes the switching speed of each of the power switching element based on the comparison result of the comparator.
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: October 9, 2012
    Assignee: Denso Corporation
    Inventors: Hiroshi Inamura, Tsuneo Maebara, Junichi Fukuta
  • Patent number: 8278778
    Abstract: A power supply for an HVAC/R system is configured to provide back-up power functionality for situations when the main source of power fails. The power supply includes a DC power bus which receives power from the main source of power as well as a back up source. When the main source fails the back up source provides power to the DC power bus. Connected to the DC power bus is a variable frequency drive power supply (VFD). The VFD is configured to provide power to the components of the HVAC/R system based on power received from the DC power bus.
    Type: Grant
    Filed: July 27, 2009
    Date of Patent: October 2, 2012
    Assignee: Rocky Research
    Inventors: Uwe Rockenfeller, Paul Sarkisian, Kaveh Khalili, Warren Harhay
  • Patent number: 8269442
    Abstract: A brushless D.C. motor includes having a rotor and a plurality of stator windings that define a stator field when driven by a bridge circuit, where a microprocessor drives the bridge circuit using a pulse-width modulation logic. The brushless D.C. motor is driven by triggering a commutation of the stator field; voltage induced by rotating the rotor in a non-energized stator winding is monitored to determine whether the voltage reaches, exceeds or is below a threshold voltage. A delay time between triggering the commutation of the stator field and the voltage reaching, exceeding or being below the threshold voltage is determined; and using the determined delay time a triggering time point for a next commutation of the stator field.
    Type: Grant
    Filed: February 16, 2010
    Date of Patent: September 18, 2012
    Assignee: Micronas GmbH
    Inventors: Hans Spirk, Gualtiero Bagnuoli
  • Patent number: 8269434
    Abstract: An automotive drive system and methods for making the same are provided. The system includes a three-phase motor and an inverter module. The three-phase motor includes a first set of windings each having a first magnetic polarity; and a second set of windings each having a second magnetic polarity that is opposite the first magnetic polarity. The first set of windings being electrically isolated from the second set of windings. The inverter module includes a first set of phase legs and a second set of phase legs. Each one of the first set of phase legs is coupled to a corresponding phase of the first set of windings, and each one of the second set of phase legs is coupled to a corresponding phase of the second set of windings.
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: September 18, 2012
    Assignee: GM Global Technology Operations LLC
    Inventors: Brian A. Welchko, Jeremy B. Campbell
  • Patent number: 8269441
    Abstract: A motor control apparatus includes a current control unit which is configured to calculate dq-axis voltage commands to match d-axis and q-axis current commands with d-axis and q-axis currents of a motor current, respectively. A power conversion circuit is configured to drive the motor. A modulation factor command unit is configured to determine a modulation factor command. A modulation wave command unit is configured to determine modulation wave commands. A pulse width modulation generating unit is configured to generate a pulse width modulation pattern. A modulation factor saturation level calculating unit is configured to determine a modulation factor saturation level. A field-weakening control unit is configured to correct the d-axis current command.
    Type: Grant
    Filed: May 13, 2010
    Date of Patent: September 18, 2012
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Shinya Morimoto, Mamoru Takaki
  • Patent number: 8269450
    Abstract: A winding switching apparatus includes a winding switching device and a drive circuit. The winding switching device is configured to switch a plurality of windings of an AC motor. The drive circuit is configured to control the winding switching device. The winding switching device includes a winding switch, a diode bridge, and a capacitor. The diode bridge includes a positive-side DC output terminal, a negative-side DC output terminal, and AC input terminals. The AC input terminals corresponds to respective phases of the AC motor. The positive-side and negative-side DC output terminals are respectively connected to positive-side and negative-side DC buses provided in an inverter. The AC input terminals are respectively connected to winding-switching terminals corresponding to the respective phases of the AC motor. The AC input terminals are respectively connected to phase terminals provided in the winding switch.
    Type: Grant
    Filed: April 19, 2012
    Date of Patent: September 18, 2012
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Koji Higashikawa, Kenji Yamada, Katsutoshi Yamanaka