With Voltage Magnitude Control Patents (Class 318/808)
  • Patent number: 10608572
    Abstract: A motor drive control device that drives and controls a motor by using a PWM inverter includes a dead time compensation portion that obtains a compensation amount to compensate for an error of an output voltage of the PWM inverter generated when a dead time to avoid simultaneous turning-on of respective switching elements mutually connected in series in the PWM inverter is prepared and outputs a voltage command obtained by taking the compensation amount into account to the PWM inverter. The dead time compensation portion obtains the compensation amount based on a magnitude of a current command vector indicating a vector of a current to be followed by a current flowing through the motor. The current command vector is a vector defined by a coordinate system in synchronism with a rotor of the motor or its equivalent coordinate system.
    Type: Grant
    Filed: October 1, 2018
    Date of Patent: March 31, 2020
    Assignee: NIDEC CORPORATION
    Inventors: Kazumasa Ue, Kazuya Matsuzaki, Ryogo Mochizuki
  • Patent number: 10523147
    Abstract: An aspect of the disclosed invention calculates a value of an inductance of a synchronous motor whose characteristic is unclear while suppressing a failure of the synchronous motor. A motor driving device according to an embodiment of the disclosed invention comprises: a motor; an inverter for supplying an alternating voltage to the motor; a current meter for measuring an introduced current flowing through the motor on the basis of the alternating voltage; and a control unit for controlling the inverter to change the size of the alternating voltage in stages, and calculating an inductance of the motor on the basis of the introduced current measured by the current meter.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: December 31, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yoshiya Nishimaki, Yuichi Takeda
  • Patent number: 10500972
    Abstract: In a permanent magnet synchronous motor drive system, phase currents can be used to calculate a current that produces no shaft torque and only motor losses and a current that only produces shaft torque. These currents can be controlled to be resupplied into the motor drive system to a desired amount on a continuous basis to maintain a DC energy storage device voltage at a desired safe level. The calculated currents are resupplied to the motor drive system such that voltage levels within the DC energy storage device that approach a voltage maximum limit are transferred to the motor in the form of current that is dissipated by the motor without losing efficiency and control of driving a load with the motor.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: December 10, 2019
    Inventors: Thomas John Bucella, Scott Mayne, Warren God
  • Patent number: 10256762
    Abstract: A method includes controlling a first power output to an electric machine during a transient event. Controlling the first power output includes measuring values of the first power output provided to the electric machine during the transient event, receiving an estimated speed input of the electric machine, determining adjustment commands to compensate the first power output for the transient event of the electric machine, generating switch commands for gate drives of a variable frequency drive (VFD) based at least in part on the adjustment commands, and modifying the first power output during the transient event based on the switch commands.
    Type: Grant
    Filed: June 27, 2017
    Date of Patent: April 9, 2019
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Kum Kang Huh, Di Pan, David Allan Torrey, Nathaniel Benedict Hawes, Tomas Sadilek
  • Patent number: 9787224
    Abstract: A motor control apparatus includes a rectifier which converts AC of a power source to DC, an inverter which converts DC to AC for a motor, a voltage amplitude calculation unit which calculates a power source voltage amplitude value, a power failure recovery detection unit which determines whether or not the AC input side has transitioned to a power failure state or a power recovery state on the basis of the power source voltage amplitude value, a protection operation command unit which outputs a protection operation command when a reference time has elapsed from a time point at which the AC input side transitioned to the power failure state, a time measurement unit which measures an elapsed time from when the AC input side transitioned to the power recovery state, and a condition change unit which changes the power failure reference voltage value and/or the reference time.
    Type: Grant
    Filed: July 6, 2016
    Date of Patent: October 10, 2017
    Assignee: FANUC CORPORATION
    Inventor: Kenta Yamamoto
  • Patent number: 9768679
    Abstract: An apparatus for restarting a medium voltage inverter is disclosed, wherein the medium voltage inverter can be restarted by estimating a rotor speed when an input power returns from an instantaneous defective state to a normal state, whereby a time to restart the medium voltage inverter can be reduced by a simple configuration to dispense with the need to wait until the rotor speed reaches zero speed.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: September 19, 2017
    Assignee: LSIS CO., LTD.
    Inventors: Beom Seok Chae, Seung Cheol Choi
  • Patent number: 9724997
    Abstract: A vehicle includes one or more inverter-fed electric machines such as permanent magnet synchronous motors. In response to a torque request, a controller issues commands to an inverter calculated to cause the motor to produce the requested torque at the current temperature. A method adjusts the direct component of the winding current such that the requested torque is delivered efficiently. For a given rotor speed, bus voltage, and torque, the direct component increases as the temperature increases.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: August 8, 2017
    Assignee: Ford Global Technologies, LLC
    Inventor: Daniel Luedtke
  • Patent number: 9720424
    Abstract: A system can include an interface to receive sensed data and economic data; a production control framework that includes a module for modeling motor efficiency of an electric submersible pump, a module for modeling gas composition of a fluid being pumped by an electric submersible pump, a module for modeling solid dynamics in a fluid being pumped by an electric submersible pump, a module to update one or more of the modules for modeling in response to receipt of data via the interface; and an interface to output control commands to a controller for an electric submersible pump based at least in part on data received by the interface and analyzed by the production control framework. Various other apparatuses, systems, methods, etc., are also disclosed.
    Type: Grant
    Filed: May 11, 2015
    Date of Patent: August 1, 2017
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Adunola Ige, Obinna Ilochonwu, Arthur I Watson, Grant T Harris, Ian Roberge
  • Patent number: 9631852
    Abstract: A variable speed drive (VSD) can be used to vary the voltage-to-frequency ratio (V/f) supplied to a compressor motor of a heating, ventilation, air conditioning or refrigeration (HVAC&R) system to compensate for varying conditions in the HVAC&R system.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: April 25, 2017
    Assignee: Johnson Controls Technology Company
    Inventor: William L. Kopko
  • Patent number: 9577419
    Abstract: Some embodiments of the inventive subject matter provide an apparatus for driving a shunt trip actuator for a circuit breaker or other switch. The apparatus includes an energy storage device and an accumulator circuit configured to store energy in the energy storage device responsive to a shunt trip control signal. The apparatus further includes a detector circuit configured to generate a detection signal responsive to a state of the energy storage device meeting a predetermined criterion and a driver circuit configured to drive the shunt trip actuator using the energy stored in the energy storage device responsive to the detection signal.
    Type: Grant
    Filed: December 16, 2013
    Date of Patent: February 21, 2017
    Assignee: Eaton Corporation
    Inventors: Jon E. Hymel, Leonard S. Scheuring
  • Patent number: 9567730
    Abstract: A work machine prevents a fault in a swing electric motor if an uneven coil temperature increase occurs in the swing electric motor during swing press and related operations. An electricity storage device is connected to the electric motor. An inverter drives the electric motor and a swing control lever issues a command to drive the swing structure. A rotational speed detecting device detects swing speed of the swing structure and a controller controls torque of the electric motor. The controller reads the swing speed of the swing structure detected by the rotational speed detecting device to control such that, when the swing speed is zero, the torque of the electric motor is smaller than a maximum torque value and, when the swing speed is a first rotational speed higher than zero, the torque of the electric motor is the maximum torque value.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: February 14, 2017
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Shinya Imura, Kouji Ishikawa, Hidetoshi Satake, Shinji Nishikawa, Tomoaki Kaneta, Shiho Izumi
  • Patent number: 9479084
    Abstract: A method of performing space vector modulation for PWM control for creating AC waveforms includes generating and sampling a reference signal to generate reference samples and performing a reference vector approximation to synthesize a reference vector associated with at least one of the reference samples. The reference vector approximation employs active vectors, one or more zero vectors, and one or more pseudo zero vectors in the formation thereof. Another method of performing space vector modulation (SVM) includes generating a reference signal and sampling the reference signal at a sampling frequency to generate a plurality of reference samples. The method also includes performing a reference vector approximation to synthesize a reference vector associated with at least one of the reference samples, wherein the reference vector approximation has a first portion that employs two adjacent active vectors and a remaining portion that employs two non-adjacent active vectors in the formation thereof.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: October 25, 2016
    Assignee: Infineon Technologies AG
    Inventors: Tao Zhao, Arno Rabenstein, Theng Kiong Gan, Choon Keat Kok, Sze Main Wong
  • Patent number: 9236824
    Abstract: A system for controlling an electric motor is disclosed herein. In particular, the system receives a user input indicative of a desired performance parameter for the electric motor. Based on the desired performance parameter, the system determines a control parameter that defines an operational range. The system then adjusts the electric motor according to the control parameter so that the electric motor generates constant output power over the operational range.
    Type: Grant
    Filed: October 12, 2012
    Date of Patent: January 12, 2016
    Assignee: Solar Turbines Incorporated
    Inventors: Daniel Fingleton, Ryan Elliott Bergener, Thayer Barakat
  • Patent number: 9148084
    Abstract: A with a converter controlled drive includes a rotor, a drive having a variable rotational frequency a working machine and a frequency converter. The drive and the working machine are connected to one another such that a torque is transmitted. The frequency converter is electrically connected to the drive and converts input frequencies to output frequencies. The output frequencies are grouped into a plurality of concentration ranges based upon a rotational speed of the machine. Each concentration range defines a blocking range. The machine has an operating rotational speed range which lies outside the blocking ranges.
    Type: Grant
    Filed: March 20, 2014
    Date of Patent: September 29, 2015
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Volker Hütten, Norbert Wagner
  • Patent number: 9130497
    Abstract: A control device for an AC rotating machine includes a voltage command calculation means (1) that calculates voltage commands on rotation two axes and a voltage applying means (2) that applies a voltage to an AC rotating machine (3), based on voltage commands on the rotation two axes outputted by the voltage command calculation means (1); the voltage command calculation means (1) calculates first-axis and second-axis voltage commands on the rotation two axes and reduces the limit value of the second-axis voltage command in proportion to the squared first-axis voltage command.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: September 8, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshihiko Kimpara, Yasuaki Hori, Masashi Iwane, Tatsuya Mori, Yuji Takatsuka, Mamoru Shiraki
  • Publication number: 20150115864
    Abstract: A motor control apparatus includes a voltage regulator to execute a voltage increase mode to increase a voltage applied to an induction motor from a lower limit of a first range over time. A frequency regulator executes a frequency decrease mode to decrease a frequency of the voltage from an upper limit of a second range over time. When a current through the motor exceeds a first threshold in the voltage increase mode, a mode changer changes the mode to the frequency decrease mode. When the current through the motor becomes smaller than a second threshold in the frequency decrease mode, the mode changer changes the mode to the voltage increase mode to control the motor to change from a free running state to a state in which the voltage and the frequency satisfy a relationship. A determinator determines whether the voltage and the frequency satisfy the relationship.
    Type: Application
    Filed: October 22, 2014
    Publication date: April 30, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Shuji MATSUDA, Hideaki IURA
  • Publication number: 20150115865
    Abstract: A motor control apparatus includes a voltage regulator to execute a voltage increase mode to increase a voltage applied to an induction motor from a lower limit of a first range over time. A frequency regulator executes a frequency decrease mode to decrease a frequency of the voltage from an upper limit of a second range over time. The frequency regulator limits decrease of the frequency when a bus voltage of a bus exceeds a first threshold in the frequency decrease mode. The bus supplies DC power to an inverter to drive the motor. A mode changer alternatively changes the voltage increase mode and the frequency decrease mode to control the motor to change from a free running state to a state in which the voltage and the frequency satisfy a relationship. The determinator determines whether the voltage and the frequency satisfy the relationship.
    Type: Application
    Filed: October 23, 2014
    Publication date: April 30, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Shuji MATSUDA, Hideaki IURA
  • 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
  • Patent number: 8950529
    Abstract: A novel multiple induction electric motor system that separately produces synchronized variable frequency alternating current control signals and using multiple induction electric motors, produces synchronized rotating magnetic fields responsive to the control signals, induces magnetic fields around a conductor in inductive rotors responsive to the rotating magnetic fields and applies rotational forces between the rotating magnetic fields and the induced magnetic fields to a common shaft of the multiple motors. The common shaft sums the rotational forces and transmits the rotational forces to a drive wheel. Such a system can be implemented using two, three or more synchronized induction electric motors, and respective elements thereof, wherein the stator and rotor laminations can be arranged, stacked and/or otherwise configured such that the multiple induction electric motors operate at lower temperatures and at higher efficiencies.
    Type: Grant
    Filed: October 4, 2013
    Date of Patent: February 10, 2015
    Assignee: Multiple Electric Systems, L.L.C.
    Inventor: Robert Ross
  • Patent number: 8928260
    Abstract: A traction motor system calculates motor flux by generating a real time effective resistance of a resistance grid calculated from motor torque and measured voltage on a DC link. Calculating effective resistance avoids solely relying on DC link voltage, which can be influenced by conditions such as wheel slip and drop out of one or more resistance grids. The effective resistance calculation is based on nominal motor values using known power levels and conditions. From these nominal values and the effective resistance, various scaling factors based on actual motor power can be generated and used to adjust a nominal flux reference to more accurately reflect actual motor flux. The scaling factors include power and torque scaling factors and a resistance scaling factor that is active during conditions such as wheel slip.
    Type: Grant
    Filed: October 18, 2012
    Date of Patent: January 6, 2015
    Assignee: Caterpillar Inc.
    Inventors: Alexander Cameron Crosman, III, Joshua M. Williams
  • Patent number: 8928263
    Abstract: A control apparatus in a motor drive system includes a magnet temperature acquiring device and a step-up ratio determining device. The magnet temperature acquiring device is configured to estimate or detect a temperature of a permanent magnet provided in a rotor or a stator of a motor of the motor drive system. The motor drive system includes a power supplying device to output direct current voltage, and a voltage step-up device to increase, at a certain step-up ratio, the direct current voltage which is output from the power supplying device. The step-up ratio determining device is configured to determine the certain step-up ratio in accordance with the temperature of the permanent magnet estimated or detected by the magnet temperature acquiring device.
    Type: Grant
    Filed: April 5, 2013
    Date of Patent: January 6, 2015
    Assignee: Honda Motor Co., Ltd.
    Inventor: Noritaka Yamaguchi
  • Publication number: 20140346998
    Abstract: The invention relates to an asynchronous motor unit including a frequency converter for regulating the asynchronous motor. The frequency converter comprises an input-side, uncontrolled bridge rectifier, a DC voltage intermediate circuit and an output-side inverter. According to the invention, the DC voltage intermediate circuit furthermore comprises a DC-to-DC converter with galvanic isolation, with the result that electrical isolation between the bridge rectifier and the inverter is produced.
    Type: Application
    Filed: December 7, 2012
    Publication date: November 27, 2014
    Inventors: Ralf Kleinodt, Uwe Gehlert
  • Patent number: 8866429
    Abstract: A power-saving driving device is provided for a same load pattern device 23 that is driven by a motor 21 receiving electric power from an inverter 19 and repeatedly operated in a same load pattern. The power-saving driving device includes: an electric power amount calculator 81 that calculates an electric power amount W received by the inverter in the same load pattern; and a parameter selection and command device 83 that makes a parameter of the inverter change to a plurality of values, compares the received electric power amounts corresponding to the values of the parameter, selects the parameter value minimizing the received electric power amount and issues the selected value as a command to the inverter.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: October 21, 2014
    Assignee: IHI Corporation
    Inventor: Motonao Niizuma
  • Publication number: 20140265946
    Abstract: Systems and methods for driving a motor are provided. One implementation of a drive system comprises a user interface, a variable speed drive, and a controller. The user interface enables a user to select an operating frequency set point and an operating voltage set point. The operating frequency set point is selected from a range of frequency set points and the operating voltage set point is selected from a range of voltage set points. The variable speed drive is configured to drive a motor at the selected operating frequency set point and selected operating voltage set point. The controller is configured to receive input from the user interface and control the operating frequency and operating voltage of the variable speed drive.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Inventors: Andrew John Bartlik, Charles Thomas McLees, JR.
  • Patent number: 8742712
    Abstract: Methods, system and apparatus are provided for controlling third harmonic voltages when operating a multi-phase machine in an overmodulation region. The multi-phase machine can be, for example, a five-phase machine in a vector controlled motor drive system that includes a five-phase PWM controlled inverter module that drives the five-phase machine. Techniques for overmodulating a reference voltage vector are provided. For example, when the reference voltage vector is determined to be within the overmodulation region, an angle of the reference voltage vector can be modified to generate a reference voltage overmodulation control angle, and a magnitude of the reference voltage vector can be modified, based on the reference voltage overmodulation control angle, to generate a modified magnitude of the reference voltage vector.
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: June 3, 2014
    Assignee: GM Global Technology Operations LLC
    Inventors: Milun Perisic, Michael H Kinoshita, Ray M. Ransom, Gabriel Gallegos-Lopez
  • Patent number: 8716968
    Abstract: A control circuit for a blender provides low-cost power conditioning through the use of a high resistance which provides temporary power for operation of low-voltage logic circuitry and low-voltage switches for a time sufficient to switch the motor on, and a lower resistance which provides sufficient power for maintaining the motor on state indefinitely as instructed by the low-voltage logic circuitry. Low average power dissipation is provided by powering the low-voltage logic circuitry and low-voltage switches using the high resistance in a standby mode and switching in the lower resistance only when the motor is activated.
    Type: Grant
    Filed: December 9, 2009
    Date of Patent: May 6, 2014
    Assignee: Illinois Tool Works Inc.
    Inventors: Eric K. Larson, Andy W. Tucker
  • Publication number: 20140009102
    Abstract: A system and method for determining rotor speed of an AC induction machine is disclosed. The system is programmed to estimate a rotor speed of the induction machine according to a linear speed estimation algorithm and based on name plate information (NPI) of the induction machine and parameters of the AC induction machine during operation thereof. The rotor speed estimation system is also programmed to estimate a rotor speed of the AC induction machine according to a frequency-domain signal processing algorithm and determine if the rotor speed estimated thereby is valid. If the rotor speed estimated by the frequency-domain signal processing algorithm is valid, then a tuned rotor speed of the AC induction machine is estimated according to the linear speed estimation algorithm and based, in part, on the rotor speed estimated by the frequency-domain signal processing algorithm.
    Type: Application
    Filed: September 10, 2013
    Publication date: January 9, 2014
    Applicant: Eaton Corporation
    Inventors: Bin Lu, Santosh Kumar Sharma, Ting Yan, Steven Andrew Dimino
  • Patent number: 8605393
    Abstract: A compressor monitoring system includes current and voltage monitors, current and voltage averaging modules, a control module, and a switch. The current monitor measures a current drawn by a motor of a compressor. The current averaging module generates first and second average current values based on the current measured by the current monitor. The voltage monitor measures a utility power voltage. The voltage averaging module generates first and second average voltage values based on the voltage measured by the voltage monitor. The control module selectively generates a fault signal when a first ratio is greater than a first predetermined threshold and a second ratio is less than a second predetermined threshold. The first ratio is based on the first and second average current values. The second ratio is based on the first and second average voltage values. The switch deactivates the motor when the fault signal is generated.
    Type: Grant
    Filed: July 16, 2012
    Date of Patent: December 10, 2013
    Assignee: Emerson Climate Technologies, Inc.
    Inventors: Nagaraj B. Jayanth, George Ramayya
  • Patent number: 8587239
    Abstract: Identification of electrical equivalent circuit parameters (15) of a three-phase asynchronous motor (09) without a shaft encoder. The method comprises—Assumption of a standstill position of the rotor (11);—Equidirectional test signal infeed U1?, U1? in ? and ? in the stator axis direction of the asynchronous motor (09);—Measuring of a measuring signal I1?, I1? of the ? and ? axial direction of the asynchronous motor (09); and—Identification of equivalent circuit parameters of the asynchronous motor (09) on the basis of the test signal voltages U1?, U1? and of the measuring signal currents I1?, I1?; whereby the test signal feed allows the rotor (11) to remain torque-free. Determination of equivalent circuit parameters (15) of an asynchronous motor (09) as well relates to a motor control device (35), whereby the identified equivalent circuit parameters (15) can be used for the determination, optimization and monitoring of a motor control and for control of electrical drives.
    Type: Grant
    Filed: August 9, 2011
    Date of Patent: November 19, 2013
    Assignee: Baumuller Nurnberg GmbH
    Inventors: Sebastian Villwock, Heiko Zatocil
  • Patent number: 8570003
    Abstract: A double fed induction generator (DFIG) system and controller are presented in which the rotor side converter is preloaded with one or more initial values for resuming regulated operation to counteract transients upon deactivation of the crowbar protection circuit to provide grid fault ride through.
    Type: Grant
    Filed: April 13, 2011
    Date of Patent: October 29, 2013
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Haihui Lu, Zhenhuan Yuan, Lixiang Wei, Russel Kerkman, Richard Lukaszewski, Ahmed Mohamed Sayed Ahmed
  • Patent number: 8550196
    Abstract: A novel multiple induction electric motor and vehicle that stores electrical power; provides a first and second direct current power input from the stored electrical power; separately produces first and second synchronized variable frequency alternating current control signal from the first and second direct current power inputs, respectively; produces first and second synchronized rotating magnetic fields responsive to the first and second variable frequency alternating current control signals, respectively; induces a first induced magnetic field around a conductor in a first inductive rotor responsive to the first rotating magnetic field; induces a second induced magnetic field around a conductor in a second inductive rotor responsive to the second rotating magnetic field; applies first and second rotational forces between the first and second rotating magnetic fields and the first and second induced magnetic fields to the shaft; and transmits the first and second rotational forces to a drive wheel.
    Type: Grant
    Filed: August 27, 2010
    Date of Patent: October 8, 2013
    Assignee: New Core, Inc.
    Inventor: Robert Ross
  • Patent number: 8497649
    Abstract: A motor driving control apparatus includes a motor driving unit which drives a motor and a driving control unit which supplies to the motor driving unit a command value for the motor driving unit to drive the motor. A power characteristic acquiring unit acquires a power characteristic of an AC power supply that supplies power to the motor. A control parameter determining unit determines based on a voltage characteristic of the AC power supply whether, during driving of the motor, the voltage of the AC power supply drops to a level that adversely affects the driving of the motor, and if positive, the control parameter determining unit sets a control parameter so that the voltage of the AC power supply does not drop below that level and supplies the control parameter to the driving control unit in order for the driving control unit to determine the command value.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: July 30, 2013
    Assignee: FANUC Corporation
    Inventors: Junichi Tezuka, Kazuyuki Sugiyama
  • Patent number: 8456115
    Abstract: A data processor establishes a first range of rotational speeds of a rotor of the motor from a first lower limit to a first higher limit and a second range of rotational speeds from a second lower limit to a second higher limit. A hysteresis band or a rotational range of speeds is established such that during operation in the first range the first higher limit is adjusted (e.g., raised by a first amount to be greater than the second lower limit). A sensor detects or measures a rotational speed of a rotor of the motor. The data processor determines whether the measured rotational speed falls within the first range or the second range, as adjusted by the hysteresis band, to identify a selected speed range. A switching frequency of a pulse-width modulation signal is varied in accordance with the selected speed range.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: June 4, 2013
    Assignee: Deere & Company
    Inventors: Long Wu, Robert Shaw
  • Patent number: 8432118
    Abstract: An inverter comprises output switches for generating motor phase currents for application to an electrical motor based on a commanded torque. A current sensor is arranged for detecting motor phase currents applied to the electrical motor by an inverter. A voltage sensor is configured for measuring voltages applied to the electrical motor by the inverter. An output port is capable of outputting output signals of the detected motor phase currents and measured voltages for processing by a vehicle controller. The output signals are suitable for input to a vehicle controller for determining whether or not to generate an override control signal. An input port is configured for receiving the override control signal from the vehicle controller. The input port is coupled to an override input module for switching off a supply of electrical energy to the electric motor.
    Type: Grant
    Filed: May 2, 2011
    Date of Patent: April 30, 2013
    Assignee: Deere & Company
    Inventors: Stephen Lind, Michael R. Schlichtmann, Orrin B. West, Kent D. Wanner
  • Publication number: 20130063070
    Abstract: The present invention provides a medium voltage variable frequency driving system, including a three-phase switch-mode rectification module, a multilevel inverter and a high-capacity capacitor module. The three-phase switch-mode rectification module is coupled with a three-phase electrical grid, for converting an AC voltage input with a fixed operating frequency on the three-phase electrical grid into a DC voltage. The multilevel inverter is used for converting the DC voltage into an AC voltage with a required variable frequency, so as to drive an induction motor. The high-capacity capacitor module is coupled between the three-phase switch-mode rectification module and the multilevel inverter, for temporarily storing the DC voltage. In the present invention, a three-phase switch-mode rectification technology is used at the front-end rectifier, and a diode-clamped three-level inverter is adapted correspondingly at the rear-end inverter.
    Type: Application
    Filed: November 10, 2011
    Publication date: March 14, 2013
    Applicant: DELTA ELECTRONICS (SHANGHAI) CO., LTD.
    Inventors: Yi Zhang, Wei Chen, Bo-Yu Pu
  • Patent number: 8390229
    Abstract: A method of braking a washing machine from an operational speed to a reduced non-zero speed is provided (as well as a washing machine incorporating the method) for a washing machine driven by one of a synchronous or asynchronous motor. Upon receipt of a speed reduction signal, the motor rotating magnetic fields are collapsed for a defined time period. After the defined time period, DC braking voltage is applied to the motor stator windings at a controlled ramp-up rate to an amplitude to generate a controlled ramped braking torque on the motor until the motor has slowed to a defined reduced speed. Thereafter, the amplitude of the DC braking voltage is set to 0V and the motor is soft started to an amplitude and reduced frequency needed to maintain the defined reduced speed.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: March 5, 2013
    Assignee: General Electric Company
    Inventor: Richard Dean Suel, II
  • Patent number: 8314577
    Abstract: An energy converter includes magnetic coils of N phases (N is an integer of 3 or more), and a PWM drive circuit for driving the magnetic coils of N phases, wherein the magnetic coil of each phase can be independently controlled by the PWM drive circuit.
    Type: Grant
    Filed: April 25, 2012
    Date of Patent: November 20, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Kesatoshi Takeuchi, Kazuyoshi Nakamura
  • Publication number: 20120268056
    Abstract: A switched resonant power converter applies AC to an induction motor. The power converter controls the magnitude and phase of the motor current, and tuning the stator flux accordingly in order to control the motor speed. A preprocessor operates on a speed command signal by getting the user speed command input to produce amplitude and phase-related signals for application to inputs of the power converter control.
    Type: Application
    Filed: April 20, 2011
    Publication date: October 25, 2012
    Applicant: PRINCETON POWER SYSTEMS
    Inventor: Yang Liu
  • Patent number: 8294413
    Abstract: A control system is provided for an inverter assembly associated with an induction motor. The system includes a current determination module configured to generate q- and d-axis current commands based on a torque command. The current determination module is further configured to generate the q-axis current command based on an observed flux linkage and a flux linkage command. The system further includes a motor current control module coupled to the current determination module and configured to generate q- and d-axis voltage commands based on the q- and d-axis current commands generated by the current determination module and a PWM modulator coupled to the motor current control module configured to generate duty cycle signals for operating the inverter assembly based on the q- and d-axis voltage commands generated by the motor current control module.
    Type: Grant
    Filed: January 5, 2010
    Date of Patent: October 23, 2012
    Assignee: GM Global Technology Operations LLC
    Inventors: Min Dai, Bon Ho Bae, Leah Dunbar
  • Patent number: 8283880
    Abstract: A motor drive device including a converter for a power running operation and a power regenerative operation. The converter has power switching elements, a first power regenerative control unit for controlling the power switching elements in the power regenerative operation by using pulse width modulation signal whose pulse width changes with a value indicated by a command signal; a second power regenerative control unit for controlling the power switching elements in the power regenerative operation to generate respective power regenerative currents in a phase representing the maximum potential among three phases of a three-phase AC power supply and a phase representing the minimum potential among the three phases, and a power regenerative operation switching unit for switching a control of the power switching elements in the power regenerative operation between a control by the first power regenerative control unit and a control by the second power regenerative control unit.
    Type: Grant
    Filed: June 3, 2011
    Date of Patent: October 9, 2012
    Assignee: FANUC Corporation
    Inventors: Yasusuke Iwashita, Shinichi Horikoshi, Takashi Harada, Shinichi Mizukami
  • Patent number: 8283885
    Abstract: A drive control signal is effectively obtained. An offset control circuit (32) adds an offset to a rotational state signal.
    Type: Grant
    Filed: June 23, 2010
    Date of Patent: October 9, 2012
    Assignee: Semiconductor Components Industries, LLC
    Inventors: Takashi Ogawa, Tsutomu Murata
  • Patent number: 8278865
    Abstract: A control device that controls a plurality of inverters respectively provided corresponding to a plurality of alternating-current electric motors so as to control the plurality of alternating-current electric motors by current feedback. The control device comprises a carrier frequency setting unit that individually selects and sets one of a plurality of carrier frequencies, each of which is a frequency of a carrier for generating switching control signals for the inverter based on a pulse width modulation method, for each of the plurality of inverters, and a switching timing table that specifies a switching timing serving as a permissible timing of switching to a different carrier frequency pair from each of a plurality of carrier frequency pairs each of which is composed of a combination of the carrier frequencies set for each of the plurality of inverters.
    Type: Grant
    Filed: August 31, 2010
    Date of Patent: October 2, 2012
    Assignee: Aisin AW Co., Ltd.
    Inventors: Arinori Shimada, Mitsuru Nakamura, Subrata Saha, Ken Iwatsuki
  • Patent number: 8264209
    Abstract: The invention relates to a method and a device for operating an asynchronous motor (1) with double feeds, having a stator (1a) connected to a grid and a rotor (1b) connected to an inverter (6), said inverter (6) being designed such that it impresses a target value for an electrical variable in the rotor (1b). In a method according to the invention, after detecting a transient grid voltage change, a target value for the electrical variable determined from at least the rotor flux and the stator flux is impressed in the rotor (1b) such that an active reduction in the torque occurring during the transient grid voltage change is achieved. The target value of the electrical variable is preferably determined from a suitable weighting of the stator flux, rotor flux, stator voltage, stator current, rotor current, and, if available as a measured variable, stator voltage.
    Type: Grant
    Filed: March 17, 2008
    Date of Patent: September 11, 2012
    Assignee: Woodward Kempen GmbH
    Inventor: Jörg Kretschmann
  • Patent number: 8258734
    Abstract: An energy converter includes magnetic coils of N phases (N is an integer of 3 or more), and a PWM drive circuit for driving the magnetic coils of N phases, wherein the magnetic coil of each phase can be independently controlled by the PWM drive circuit.
    Type: Grant
    Filed: February 8, 2010
    Date of Patent: September 4, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Kesatoshi Takeuchi, Kazuyoshi Nakamura
  • Patent number: 8248013
    Abstract: A fan device with improved speed control module includes a stator, a rotor, and a speed control module. The stator has a driving unit outputting currents for the stator to generate alternative magnetic fields and thus turn the rotor. The speed control module includes a control unit and a speed adjusting circuit, with the control unit generating a control command for the driving unit and further outputting a state signal for the speed adjusting circuit to control whether a PWM signal enters the control circuit or not.
    Type: Grant
    Filed: March 26, 2009
    Date of Patent: August 21, 2012
    Assignee: Sunonwealth Electric Machine Industry Co, Ltd.
    Inventors: Alex Horng, Chun-Yuan Huang, Chung-Ken Cheng, Nguyen Nguyen, Susheela Narasimhan
  • Publication number: 20120206083
    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: Application
    Filed: April 19, 2012
    Publication date: August 16, 2012
    Applicant: Kabushiki Kaisha Yaskawa Denki
    Inventors: Koji HIGASHIKAWA, Kenji Yamada, Katsutoshi Yamanaka
  • Patent number: 8237396
    Abstract: A motor driving device includes a first power supply terminal, a second power supply terminal, a drive unit that is coupled to the first power supply terminal, the second power supply terminal, and a motor winding, a control unit that controls the drive unit, and a resistive element that is coupled between the drive unit and the first power supply terminal. The control unit makes the motor winding and the resistive element form a loop circuit when a voltage between the first power supply terminal and the second power supply terminal exceeds a predetermined value.
    Type: Grant
    Filed: June 3, 2009
    Date of Patent: August 7, 2012
    Assignee: Renesas Electronics Corporation
    Inventor: Satoshi Ikei
  • Patent number: 8217597
    Abstract: A drive circuit comprising: a direct current power source; a control unit for supplying control signals; a power switch topology comprising a first switch and a second switch each having an input terminal, an output terminal, and a control terminal, the input terminals being respectively connected to the power source, the control terminals being connected to the control unit for receiving the control signals there from, the output terminals being connected to a node; and an inductance connected with a capacitive load in series between the node and the power source, wherein the control signals control the switches to alternately conduct to thereby cause the node to output a pulse signal.
    Type: Grant
    Filed: August 27, 2009
    Date of Patent: July 10, 2012
    Assignee: Johnson Electric S.A.
    Inventors: Chi Ping Sun, Jian Qun Wu, Hai Bo Jiang, Jian Han
  • Patent number: 8207701
    Abstract: A control method of the electromotor comprises: setting a target alternating axis current based on the rotor angular velocity of the electromotor and a target direct axis current based on the torque of the motor; simultaneously detecting three-phase currents and current rotor position angle of the electromotor; converting the three-phase currents to an actual alternating axis current and an actual direct axis current by Park and Clark conversions; inputting the difference between the target current and the actual current to a current loop, outputting the required direct axis current and the required alternating axis current; determining the three phase voltages according to the required direct axis current and alternating axis current and the angle of the electromotor rotor position; obtaining PWM control waveform through three-phase voltages, wherein said PWM control waveform is configured to control the conversion from direct current to alternating current and drives the electromotor.
    Type: Grant
    Filed: October 31, 2006
    Date of Patent: June 26, 2012
    Assignee: BYD Company, Ltd.
    Inventors: Xiaohua Tang, Xuguang Zhou, Hongbin Luo, Ming Yu, Nan Liu, Jian Gong, Guangming Yang