Responsive To Speed Or Rotation Phase Angle Patents (Class 318/799)
  • Patent number: 10638006
    Abstract: A sheet conveyance apparatus includes a connection member to connect or separate a motor to drive a conveyance roller, where a motor rotor has a rotation phase and a motor winding includes a driving current controlled by a controller. Per control by the controller, a value of a torque current component of a detected driving current becomes a target value of the torque current component and a value of an exciting current component of the detected driving current becomes a target value of the exciting current component. The controller can cause a deviation between a rotor target phase and a determined rotation phase to decrease, cause magnetic flux passing through the winding to be weaker than a magnetic flux of the rotor, and cause the magnetic flux to be stronger than that passing through the winding in a first period.
    Type: Grant
    Filed: January 25, 2019
    Date of Patent: April 28, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yuta Nito
  • Patent number: 10587185
    Abstract: A power electronics switching system has a power converter including switching elements respectively disposed in parallel paths. The system also has a controller that outputs switching commands for the switching elements derived from carrier waveforms and reference waveforms corresponding to the switching elements, and generates a shape for one of the carrier waveforms according to a difference in magnitudes between the reference waveforms such that the shape is of a first type responsive to the difference being greater than a first threshold and is of a second type different than the first type responsive to the difference being less than a second threshold.
    Type: Grant
    Filed: April 16, 2019
    Date of Patent: March 10, 2020
    Assignee: Ford Global Technology, LLC
    Inventors: Srikanthan Sridharan, Jun Kikuchi
  • Patent number: 10505485
    Abstract: A motor controller includes: a primary frequency control unit that generates a primary frequency command value based on current information of an induction motor and limits the primary frequency command value based on a maximum primary frequency; a rotation speed estimating unit that estimates a slip frequency based on the current information of the induction motor and estimates a rotation speed based on the estimated slip frequency estimation value and the primary frequency command value; a proximity switch that outputs an ON signal or OFF signal when a portion of a rotating body of the induction motor is in proximity or not in proximity; a rotation speed computing unit that computes a rotation speed based on the ON signal and the OFF signal; and a maximum primary frequency computing unit that computes the maximum primary frequency based on the rotation speed computation value.
    Type: Grant
    Filed: June 27, 2018
    Date of Patent: December 10, 2019
    Assignee: FANUC CORPORATION
    Inventors: Shoutarou Hashimoto, Yuuki Morita
  • Patent number: 10481598
    Abstract: A motion control system provides optimized communications within and between an amplifier and a profile generation subsystem. In particular, the communications can provide data streams between components of the motion control that are derived from observed variables of the motion system. An amplifier subsystem drives a motor and output motor data indicating status of the motor. The profile generation subsystem issues motor control commands to the amplifier subsystem and generates motor summary data based on the motor data. The profile generation subsystem selectively output an error signal based on at least one of the motor data and motor summary data.
    Type: Grant
    Filed: July 26, 2018
    Date of Patent: November 19, 2019
    Assignee: Performance Motion Devices, Inc.
    Inventors: Peter Fransiscus Vandermeulen, Emanuel Gustav Lewin, Thomas Keller
  • Patent number: 10205412
    Abstract: A motor driving circuit and a motor component are provided.
    Type: Grant
    Filed: August 8, 2016
    Date of Patent: February 12, 2019
    Assignee: JOHNSON ELECTRIC INTERNATIONAL AG
    Inventors: Chi Ping Sun, Shing Hin Yeung, Fei Xin, Xiu Wen Yang, Shu Juan Huang, Yun Long Jiang, Yue Li, Bao Ting Liu, En Hui Wang, Li Sheng Liu, Yan Yun Cui
  • Patent number: 10072993
    Abstract: A torque estimating system for a synchronous electric motor having a permanent magnet includes: a superimposing unit configured to superimpose a voltage or current of a frequency different from a frequency of a fundamental wave driving the synchronous electric motor on at least a d-axis of the synchronous electric motor; a magnet temperature estimating unit configured to estimate a temperature of the permanent magnet from the superimposed voltage or current and a current or voltage obtained by the superimposing; and a torque estimating unit configured to estimate a torque of the synchronous electric motor from the estimated temperature of the permanent magnet.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: September 11, 2018
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: David Díaz Reigosa, Fernando Briz Del Blanco, Hideo Yoshida, Takashi Kato
  • Patent number: 10014805
    Abstract: A method and apparatus for controlling commutation of a motor. A voltage is measured at each of a plurality of windings of a motor using an electric circuit. A controller computes an overall back electromotive force for the motor using the voltage measured at each winding in the plurality of windings. The controller generates a result having either a first value or a second value based on the overall back electromotive force. The controller adjusts the commutation phase and the commutation period of the motor using the result.
    Type: Grant
    Filed: May 6, 2016
    Date of Patent: July 3, 2018
    Assignee: The Boeing Company
    Inventors: Douglas Conrad Cameron, Kevin T. Colangelo, Suhat Limvorapun
  • Patent number: 10004945
    Abstract: A training apparatus including a training element for a user performing exercises, an AC motor and a frequency converter being arranged to control the AC motor, wherein the frequency converter comprises measuring means being arranged to measure a voltage and a current of the AC motor and calculation means being arranged to calculate a magnetic state of the AC motor using the measured voltage, the measured current, a reference torque and a reference flux in order to generate a torque of the AC motor. The training apparatus further comprises a control unit having a machine control module being arranged to calculate the reference flux and the reference torque using an intended overall torque, wherein the machine control module is connected to the frequency converter and arranged to transmit the reference flux and the reference torque to the frequency converter.
    Type: Grant
    Filed: June 24, 2011
    Date of Patent: June 26, 2018
    Assignee: eGym GmbH
    Inventor: Florian Sauter
  • Patent number: 9973130
    Abstract: A method for driving an AC motor is disclosed. The method comprises generating two phases of currents to drive the motor coils to generate one magnetic field sum, and each positive and negative half output cycle of each phase of current has a positive or negative curved-triangle current. A method for generating electric power with an AC motor generator is also disclosed.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: May 15, 2018
    Inventor: Ghing-Hsin Dien
  • Patent number: 9935567
    Abstract: A rotating electric machine control device includes: a q-axis PI controller calculating a pre-restriction q-axis voltage instruction value based on a q-axis voltage detection value and a q-axis current instruction value; a first q-axis restricter calculating a post-restriction q-axis voltage instruction value by restricting the pre-restriction q-axis voltage instruction value, for an excess of output exceeding a maximum outputtable voltage V_max; a correction value calculator calculating a q-axis correction value that has a reverse phase of a ripple current of a q-axis current; and a corrector correcting the post-restriction q-axis voltage instruction value with the q-axis correction value. In such manner, even when the pre-restriction q-axis voltage instruction value is saturated, a ripple current is reduced, thereby reducing a sound and/or a vibration caused by the ripple current.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: April 3, 2018
    Assignee: DENSO CORPORATION
    Inventors: Akira Takesaki, Nobuyori Nakajima
  • Patent number: 9882515
    Abstract: The method is for making an electric motor more efficient by iteratively changing when a processor sends activation signals to transistors to minimize a current required to rotate a rotor at a constant rotational speed. The method is also for changing a rotational direction of the rotor by switching the order in which activation signals are sent to the transistors.
    Type: Grant
    Filed: June 19, 2017
    Date of Patent: January 30, 2018
    Assignee: LD DESIGN ELECTRONICS AB
    Inventor: Lars Dernebo
  • Patent number: 9774287
    Abstract: An electric machine assembly includes an electric machine having a stator configured to have a stator current and a controller configured to receive a torque command (T). The controller has a processor and tangible, non-transitory memory on which is recorded instructions for executing a method of modifying the stator current for enhanced flux weakening. The controller is programmed to obtain a base stator current [IdLU, IqLU] from a look-up table based at least partially on the torque command (T). The controller is programmed to obtain a characteristic angle (?i, i=1, 2, 3) based at least partially on a value of the torque command (T) and the base stator current [IdLU, IqLU]. A stator current modifier [?Id, ?Iq] is obtained based at least partially on the characteristic angle (?i, i=1, 2, 3) and a flux weakening factor (?IS) such that: ?Id=(?IS*cosine (?i)) and ?Iq=(?IS*sine (?i)).
    Type: Grant
    Filed: July 14, 2016
    Date of Patent: September 26, 2017
    Assignee: GM Global Technology Operations LLC
    Inventors: Dwarakanath V. Simili, Bon Ho Bae, Aayush Gupta
  • Patent number: 9667185
    Abstract: A method and a device for operating a closed-loop or open-loop speed-controlled electric motor of a fan drive, which motor is connected to an on-board system voltage of a motor vehicle and the motor speed of which is set to a defined first desired speed, wherein, if the on-board system voltage fluctuates, the motor speed is set to a desired speed that is lower compared with the first desired speed.
    Type: Grant
    Filed: December 11, 2015
    Date of Patent: May 30, 2017
    Assignee: Brose Fahrzeugteile GmbH & Co. KG, Wuerzburg
    Inventors: Dirk Joachimsmeyer, Martin Rauch
  • Patent number: 9520821
    Abstract: A system and method for dynamically optimizing flux levels in electric motors based on estimated torque. Motor parameters and motor equations are used to estimate operating characteristics and to set current and voltage limits which define an optimal flux operating range for a given speed and torque of the motor. A slope of a linear flux gain is determined within the defined operating range at different speeds of the motor. The determined slopes for the different speeds are saved in a memory element. A control element determines and achieves an optimal flux level for the motor by accessing the table to identify a specific slope which corresponds to an actual speed of the motor, multiplying the slope by the estimated torque and adding an offset value to determine a phase current component value associated with the optimal flux level, and applying the determined phase current component value to the motor.
    Type: Grant
    Filed: August 19, 2015
    Date of Patent: December 13, 2016
    Assignee: Nidec Motor Corporation
    Inventor: Thomas J. Sheahan
  • Patent number: 9509240
    Abstract: A drive unit includes: an electric motor; a flux estimator circuit configured to estimate at least a flux angle; a synchronous frame generator coupled to a rotor of the AC induction motor and configured to detect a rotor mechanical angle; and a switch configured to selectively provide either the flux angle or the rotor mechanical angle for controlling the motor.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: November 29, 2016
    Assignee: TESLA MOTORS, INC.
    Inventor: Mark Holveck
  • Patent number: 9479100
    Abstract: An electric motor controller includes a first coordinate conversion unit that converts a three-phase current into a current in a ?c-?c rotating coordinate system, a first calculation unit that obtains a first term, a second calculation unit that obtains a voltage command value in the ?c-?c rotating coordinate system as a sum of the first term and a second term, a second coordinate conversion unit that coordinate-converts the voltage command value into a voltage command value of a voltage to be applied to a rotary electric motor in another coordinate system.
    Type: Grant
    Filed: July 11, 2013
    Date of Patent: October 25, 2016
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Takeshi Araki, Naoto Kobayashi, Nobuki Kitano
  • Patent number: 9463712
    Abstract: A method controlling a powertrain fitted in an automobile and including an electric motor including a rotor and stator, the method including: regulation of currents of the rotor and the stator via control signals from the electric motor, wherein the currents and control signals are expressed in a rotating coordinate system and include a plurality of axes, the control signals resulting from a first transformation including a change of variable that enables dynamic decoupling between the control signals, along each of the axes of the plurality of axes; saturation of the control signals resulting from the first transformation to satisfy constraints of a battery fitted in the automobile and connected to the electric motor; and blockage of at least some of the current reference values of the regulation if the control signals are saturated.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: October 11, 2016
    Assignee: RENAULT s.a.s.
    Inventors: Ludovic Merienne, Abdelmalek Maloum
  • Patent number: 9438027
    Abstract: A power interruption circuit for use in a power distribution module is provided. The power interruption circuit is configured to provide power to a load and includes a shunt resistor, a plurality of switches, and microprocessor. The microprocessor is configured to determine a digitized value of a current flowing through the shunt resistor, determine a digitized value of an output voltage of the power interruption circuit, calculate, from the digitized current value and the digitized output voltage value, a power provided by the power interruption circuit to the load, compare the calculated power to a threshold power level, and control the plurality of switches based on the comparison.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: September 6, 2016
    Assignee: General Electric Company
    Inventors: Gary Jay Turner, Darwin Drake Smith, Tab O. Walter
  • Patent number: 9425677
    Abstract: A power converter that includes: a power conversion unit; and a control unit configured to control the power conversion unit such that the power conversion unit operates as a virtual synchronous generator. The control unit includes: an AVR model unit; a governor and driving source model unit; a power generation torque arithmetic operation unit; a rotation angle arithmetic operation unit; a voltage d-q conversion unit; and a generator model unit configured to perform arithmetic operation.
    Type: Grant
    Filed: October 18, 2013
    Date of Patent: August 23, 2016
    Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Kenichi Sakimoto, Kazushige Sugimoto, Yuji Shindo
  • Patent number: 9413280
    Abstract: An inverter is provided. The inverter includes a current providing unit providing a first axis current and a second axis current to an induction motor; a revolutions per minute (RPM) measuring unit measuring the RPM of the induction motor; and a control unit changing the second axis current according to the measured RPM.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: August 9, 2016
    Assignee: LSIS CO., LTD.
    Inventors: Byung Woon Jang, Chun Suk Yang, Jae Hoon Jang, Joong Ki Jung, Sun Woo Lee
  • Patent number: 9369079
    Abstract: The invention relates to a method (40) for monitoring a torque of an electric motor (10), in particular for application in a motor vehicle, wherein the electric motor (10) is supplied with electric current (IS1, IS2, IS3) in multiple phases. A first torque value (M2) of the torque generated by the electric motor (10) is determined (58) on the basis of the electric output of the electric motor (10) and a detected rotational speed (n) of a rotor of the electric motor (10). A second torque value (M1) is determined on the basis of at least one measured phase current (IS1, IS2, IS3) and a rotational position of the rotor, and the two determined torque values (M1, M2) are compared (60) to one another for plausibility checking.
    Type: Grant
    Filed: March 5, 2012
    Date of Patent: June 14, 2016
    Assignee: Robert Bosch GmbH
    Inventors: Chengxuan Fu, Wilfried Feuchter
  • Patent number: 9297676
    Abstract: In a device in which the rotation angle of the rotor is detected with a resolver, the rotation angle of the rotor with less error can be obtained while reducing burden of the operator. The measured angle value acquisition unit acquires the measured-rotation angle value of a motor shaft. The error calculation unit calculates the error included in each of measured-rotation angle values. The frequency component acquisition unit determines the phase and the amplitude of a frequency component of the error based on the errors. Thus, by using the error frequency component acquisition device, the phase and amplitude of the frequency component of the error included in the measured-rotation angle value can be automatically calculated and the correction with respect to the measure-rotation angle value can be performed using the acquired phase and amplitude. Therefore, the rotation angle of the rotor with less error can be obtained, while reducing the burden of the operator.
    Type: Grant
    Filed: September 5, 2012
    Date of Patent: March 29, 2016
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventor: Yoshiki Kato
  • Patent number: 9300238
    Abstract: A motor driving device includes a microcomputer, a command voltage adjusting circuit, and a driving IC. The command voltage adjusting circuit converts a first command voltage signal from the microcomputer to a second command voltage signal. The driving IC generates a drive pulse based on the second command voltage signal. An upper and a lower limit of an input voltage range of the driving IC are larger than an upper and a lower limit of a voltage range of the first command voltage signal, respectively.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: March 29, 2016
    Assignee: NIDEC TECHNO MOTOR CORPORATION
    Inventors: Koji Mizukami, Hiroyuki Shitabo
  • Patent number: 9255817
    Abstract: A rotation-angle detection device includes: an amplitude adjustment unit that performs correction to match amplitude values of multiple detection signals output from multiple rotation detection units to output corrected signals, the rotation detection units changing outputs in accordance with a rotation angle of a rotor and being provided such that the rotation detection units output the detection signals having different phases; a vector generation unit that performs addition and subtraction on two signals out of the corrected signals to generate two vector component signals that are perpendicular to each other; an amplitude correction unit that performs correction to match amplitudes of the two vector component signals to output corrected vector component signals; and a rotation-angle searching unit that searches for the rotation angle of the rotor on basis of a vector that is represented by the two corrected vector component signals to output a detection angle.
    Type: Grant
    Filed: May 16, 2014
    Date of Patent: February 9, 2016
    Assignee: Ricoh Company, Limited
    Inventor: Tatsuya Kawase
  • Patent number: 9240745
    Abstract: A system and method are described for conserving energy by decoupling a supply voltage to an electric motor operating under periodic load variations. A time segment value corresponding to a duration of periodic load variations is obtained and the supply voltage is adjusted to maintain an observed phase angle for a supply voltage and current at a value corresponding to a target phase angle. At least one off-time period is identified during the time segment value that corresponds to when the adjusted supply voltage is applied to the motor. During a remainder of the time segment value, at least one turn-on time period is provided when the supply voltage is coupled to the motor. The system may enter to a closed-loop control process after a predetermined period of time to adjust to any changes in the periodic load variations.
    Type: Grant
    Filed: February 27, 2014
    Date of Patent: January 19, 2016
    Assignee: The Powerwise Group, Inc.
    Inventor: Vasan Venkataraman
  • Patent number: 9225283
    Abstract: A motor control device includes an inverter, a power device temperature obtaining unit, a motor temperature obtaining unit, a power device temperature determination level storage unit, a motor temperature determination level storage unit, a PWM frequency storage unit that stores at least two PWM frequencies including a high PWM frequency a low PWM frequency, a power device temperature determining unit that determines whether or not a temperature of a power device is equal to or higher than a power device temperature determination level, a motor temperature determining unit that determines whether or not a temperature of a motor is equal to or higher than the motor temperature determination level, and a PWM frequency selecting unit that selects a PWM frequency to be given as a command to the inverter.
    Type: Grant
    Filed: October 3, 2013
    Date of Patent: December 29, 2015
    Assignee: FANUC CORPORATION
    Inventors: Yuuki Morita, Daisuke Tajima
  • Patent number: 9219432
    Abstract: An angle estimation control system of a permanent magnet motor is provided. The angle estimation control system includes a Clarke transform module, a Park transform module, and an angle estimation module. The Clarke transform module generates orthogonal current signals in accordance with motor phase currents. The Park transform module generates a current signal in response to the orthogonal current signals and an angle signal. The angle estimation module generates the angle signal in response to the current signal. The angle signal is related to a commutation angle of the permanent magnet motor. The current signal is controlled to be approximately equal to zero. The angle signal is further coupled to generate three phase motor voltage signals.
    Type: Grant
    Filed: July 17, 2013
    Date of Patent: December 22, 2015
    Assignee: SYSTEM GENERAL CORPORATION
    Inventors: Chih-Kai Huang, Yi-Chi Lin, Pei-Yu Chiang
  • Patent number: 9118267
    Abstract: A fan control circuit includes a hardware controller, a rectifier circuit, first to third electronic switches, and a fan. When the hardware controller outputs a pulse width modulation (PWM) signal to the rectifier circuit and the fan, the rectifier circuit transforms the PWM signal into a direct current (DC) voltage and outputs the DC voltage to the first electronic switch. The first electronic switch is turned on, and the second and third electronic switches are turned off. A rotation speed of the fan is controlled by the PWM signal received from the hardware controller. When the hardware controller does not output the PWM signal, the first electronic switch is turned off, the second and third electronic switches are turned on, a DC power supply supplies power to the fan through the third electronic switch, and the fan rotates at full speed.
    Type: Grant
    Filed: December 29, 2013
    Date of Patent: August 25, 2015
    Assignees: HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD., HON HAI PRECISION INDUSTRY CO., LTD.
    Inventor: Hai-Qing Zhou
  • Patent number: 9041330
    Abstract: A sensorless brushless motor control device includes a first amplification module common to all motor phases and generating an intermediary voltage signal, a voltage divider between each motor phase and a node on which the intermediary voltage signal is generated, and a computation unit. Each voltage divider generates a first corrected electromotive force with a predetermined average value. The computation unit controls the motor on the basis of the first corrected electromotive forces. By using only hardware components, the control device maintains the average of the corrected electromotive forces at the center of the analog acquisition zone of the computation unit.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: May 26, 2015
    Assignee: DASSYM SA
    Inventor: Jean-Pierre Voillat
  • Patent number: 9030141
    Abstract: There is provided a motor controlling circuit including: a hall signal level detecting unit detecting a hall signal from a hall sensor; and a signal generating unit sensing a change in a level of the hall signal to generate a motor controlling signal according to the change in the level of the hall signal, wherein the signal generating unit determines that the hall signal is maintained at a high level in a case in which a high level maintaining time of the hall signal is equal to or shorter than a preset time.
    Type: Grant
    Filed: December 12, 2012
    Date of Patent: May 12, 2015
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Bon Young Gu
  • Patent number: 9024563
    Abstract: A pitch drive circuit that operates in an emergency mode, for a wind or water power plant. The circuit has at least one rectifier unit, at least one DC intermediate circuit, two inverter units and a pitch rotary current motor with motor trains that can be contacted on both sides. A first contact side of the motor trains is connected to a first inverter unit and a second contact side of the motor trains is connected to a second inverter unit. At least one switching element is connected to at least one contact side of the motor trains. In a normal operating mode of a first switching state of the switching element the motor trains can be energized via both inverter units, and in an emergency operating mode of a second switching state of the switching element, the motor trains can be energized via a single inverter unit.
    Type: Grant
    Filed: October 25, 2011
    Date of Patent: May 5, 2015
    Assignee: LTi REEnergy GmbH
    Inventors: Andreas Bünte, Harald Wertz, Christian Kleinen, Harry Gill
  • Patent number: 9024569
    Abstract: A system and method for determining a rotor time constant of an AC induction machine is disclosed. During operation of the induction motor, a flux signal is injected into a rotor flux command so as to generate a time-variant rotor flux. A voltage-current flux observer determines amplitudes of rotor flux variations resulting from the time-variant rotor flux, with the amplitudes of the rotor flux variations comprising an amplitude of a rotor flux variation based on a current model of the voltage-current flux observer and an amplitude of a rotor flux variation based on a combined voltage-current model of the voltage-current flux observer. A rotor time constant of the induction motor is then estimated based on the determined amplitudes of the rotor flux variations.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: May 5, 2015
    Assignee: Eaton Corporation
    Inventors: Kai Wang, Wenxi Yao, Huaqiang Li, Zhengyu Lu
  • Patent number: 9024555
    Abstract: A motor control device has an overcurrent test unit to send a first test voltage Vt1 lower than a reference voltage Vref for overcurrent determination and a second test voltage Vt2 not lower than the reference voltage Vref to an overcurrent determination unit when a synchronous motor is not rotated. The motor control device determines that an abnormality occurs in the overcurrent detection unit when the overcurrent determination unit determines that the first test voltage Vt1 causes an overcurrent on the basis of a comparison result, or the second test voltage Vt2 causes no overcurrent on the basis of the comparison result.
    Type: Grant
    Filed: May 27, 2010
    Date of Patent: May 5, 2015
    Assignee: Sanden Corporation
    Inventor: Daisuke Hirono
  • Patent number: 9018876
    Abstract: When a current sensor fails, instead of a normal-time motor control section, an abnormal-time motor control section drives and controls a motor. The abnormal-time motor control section detects a timing at which motor current I becomes zero in a state in which all the switching devices are turned off (S11 to S13). Every time the motor current I becomes zero, the abnormal-time motor control section sets an ON time T0 corresponding to steering torque |tr| (S14 to S15), and turns on the switching devices corresponding to the direction of the steering torque for the ON time T0 (S17 to S20). With this operation, an average current Iavg corresponding to the steering torque |tr| flows through the motor 20, whereby deterioration of the followability of steering assist is suppressed.
    Type: Grant
    Filed: February 21, 2011
    Date of Patent: April 28, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Kenichiro Aoki
  • Patent number: 9007004
    Abstract: A controller for an AC electric motor, includes a Feed Forward Torque Controller and a load model. The Torque controller directly derives a torque related component of applied motor voltages from a signal representing a torque command input T* and at least one motor parameter. The load model derives a motor speed value including a model of motor speed behavior of the AC electric motor to provide an output signal which represents the motor speed of the AC electric motor. This motor speed output signal is used in determining a frequency of rotation of an applied motor voltage vector. Where an input to the load model is the signal representing the torque command input T*, the load model uses the signal representing the torque command T*, at least over a part of an operating speed range of the AC motor which includes zero speed, to determine the motor speed output signal.
    Type: Grant
    Filed: November 1, 2010
    Date of Patent: April 14, 2015
    Assignee: University of Technology, Sydney
    Inventor: Gregory Peter Hunter
  • Patent number: 8988027
    Abstract: A motor control apparatus according to the embodiment includes a rotational position estimating unit, a change amount estimating unit, and an inductance estimating unit. The rotational position estimating unit estimates a rotational position of a rotor from a motor parameter including a q-axis inductance of a motor on a basis of an output current to the motor and a voltage reference. The change amount estimating unit estimates a change amount of an output torque with respect to a current phase change of the motor corresponding to a high frequency signal whose frequency is higher than a drive frequency of the motor. The inductance estimating unit estimates an inductance value that obtains a maximum torque on a basis of the change amount as the q-axis inductance.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: March 24, 2015
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Shingo Fukumaru, Shinya Morimoto, Hideaki Iura, Akira Yamazaki
  • Patent number: 8988030
    Abstract: This disclosure is drawn to methods, systems, devices and/or apparatus related to power control in applications over long cables. Specifically, the disclosed methods, systems, devices and/or apparatus relate to power control that considers the maximum power available at the end of a long cable (or from a battery) to a load over a broad range of load conditions. Some example systems may include a power supply located at the Earth's surface and a power converter coupled to the power supply via a cable having a first end coupled to the power supply and a second end coupled to the power converter. Some example power converters may be configured to measure the power being consumed by the electrical load in the well, and adjust operating parameter(s) of the electrical load based, at least in part, on the maximum power available at the second end of the cable.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: March 24, 2015
    Assignee: Schlumberger Technology Corporation
    Inventors: Ramon Hernandez Marti, John Parry, Dudi Rendusara
  • Patent number: 8963460
    Abstract: A method for controlling a motor is provided. The method comprises obtaining electrical signals of the motor with a signal unit, the electrical signals comprising a motor torque and an angular velocity, calculating a voltage phase angle of a voltage vector with a calculating component, wherein a command torque, the motor torque, the angular velocity and a voltage amplitude of the voltage vector are inputs of the calculating component, and wherein the voltage phase angle is a variable and the voltage amplitude is a constant. The method further comprises modulating the voltage phase angle and the voltage amplitude to a switching signal for controlling an inverter; converting a direct current voltage to the voltage vector according to the switching signal, and applying the voltage vector to the motor.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: February 24, 2015
    Assignee: General Electric Company
    Inventors: Yong Li, Pengju Kang, Ronghui Zhou, Xiangming Shen, Xiao Chen, Zili Cai, Tong Zhao
  • Patent number: 8947035
    Abstract: A rotation speed control circuit is disclosed. The rotation speed control circuit includes a temperature-controlled voltage duty generator, a pulse-width signal duty generator, a multiplier and a rotation speed signal generator. The temperature-controlled voltage duty generator converts temperature-controlled voltage to digital temperature-controlled voltage and executes linear interpolation operation according to a first setting data so as to output temperature-controlled voltage duty signal. The pulse-width signal duty generator coverts pulse-width input signal to a digital pulse-width input signal and executes linear interpolation operation according to a second setting data so as to output a pulse-width duty signal. The temperature-controlled voltage duty signal and the pulse-width duty signal are executed for multiplication by the multiplier so as to output mixing-duty signal.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: February 3, 2015
    Assignee: Anpec Electronics Corporation
    Inventors: Ching-Sheng Li, Shen-Min Lo, Kun-Min Chen, Chia-Tai Yang, Ming-Jung Tsai
  • Patent number: 8941342
    Abstract: An integrated servo system and a method of controlling a motor is provided. The integrated servo system includes a position detector which determines original position data of a motor and a position signal processor which determines a position of the motor based on the determined position data. The integrated servo system further includes a servo controller circuit which controls the motor based on the determined position data and a parallel bus through which the determined position data is transmitted from the position signal processor to the servo controller circuit.
    Type: Grant
    Filed: August 26, 2011
    Date of Patent: January 27, 2015
    Assignee: Mitsubishi Electric Corp.
    Inventor: Kei Terada
  • Patent number: 8941349
    Abstract: A motor drive circuit includes: an advance angle setting correcting device having a correction reference cycle according to a reference advance angle count value, in which a correction amount is calculated as a ratio of the correction reference cycle to a cycle of a detection signal indicating a detected frequency proportional to a motor rotation speed, and in which an advance angle setting signal is obtained by multiplying the correction amount by a proportionality factor; and an advance angle setting device in which the advance angle correction value is added to the reference advance angle count value thereby outputting an advance angle setting signal, wherein a drive command signal containing a rotation speed information based on a target rotation speed is externally fed, the motor rotation speed is variably controlled in response to the drive command signal, and the detection signal is fed from a rotation speed detecting device.
    Type: Grant
    Filed: April 10, 2013
    Date of Patent: January 27, 2015
    Assignee: Minebea Co., Ltd.
    Inventor: Tomohiro Inoue
  • Patent number: 8937450
    Abstract: A motor driving system including command value output means configured to output an analog value according to a rotation speed command; a first power line having first switching means; a drive circuit, to which power is supplied via the first switching means and the first power line, driving a motor supplying rotation based on the analog value; and switching control means configured to make the first switching means nonconductive when the analog value is smaller than a first predetermined value, and independent of the command value output means.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: January 20, 2015
    Assignee: Daikin Industries, Ltd.
    Inventors: Shin Higashiyama, Satoshi Yagi
  • Patent number: 8928271
    Abstract: An apparatus or method which accepts a burst of pulses at a frequency which may not be tightly controlled and converts this into a trajectory command that is a suitable motion profile for an incremental motor control application. The output of the invention can be a pulse stream that can be fed to an existing incremental pulse input motor drive or the invention can be embedded into a motor drive where its output is a numerical sequence that defines a physically realizable trajectory to be fed to the control circuits and software within the motor drive.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: January 6, 2015
    Assignee: Teknic, Inc.
    Inventors: Thomas John Bucella, David W. Sewhuk, Scott M. Mayne
  • Publication number: 20150002071
    Abstract: A system and method for determining a rotor time constant of an AC induction machine is disclosed. During operation of the induction motor, a flux signal is injected into a rotor flux command so as to generate a time-variant rotor flux. A voltage-current flux observer determines amplitudes of rotor flux variations resulting from the time-variant rotor flux, with the amplitudes of the rotor flux variations comprising an amplitude of a rotor flux variation based on a current model of the voltage-current flux observer and an amplitude of a rotor flux variation based on a combined voltage-current model of the voltage-current flux observer. A rotor time constant of the induction motor is then estimated based on the determined amplitudes of the rotor flux variations.
    Type: Application
    Filed: June 28, 2013
    Publication date: January 1, 2015
    Inventors: Kai Wang, Wenxi Yao, Huaqiang Li, Zhengyu Lu
  • Patent number: 8922155
    Abstract: In various implementations, a condition of a motor may be monitored based at least partially on time required to achieve a change in speed. A notification may be transmitted based on the condition of the motor.
    Type: Grant
    Filed: December 10, 2012
    Date of Patent: December 30, 2014
    Assignee: Lennox Industries Inc.
    Inventors: Joe Powell, Randall L. Lisbona
  • Patent number: 8917044
    Abstract: A motor control circuit and associated techniques detect a zero crossing of a current in a motor winding by detecting a reverse current in a half bridge circuit used to drive the motor winding.
    Type: Grant
    Filed: August 30, 2012
    Date of Patent: December 23, 2014
    Assignee: Allegro Microsystems, LLC
    Inventors: Timothy Reynolds, Chengyi Jin
  • Patent number: 8907598
    Abstract: Method for operating an actuator for maneuvering a windable mobile element of a home automation appliance, the mobile element being able to be displaced between two extreme positions, the method comprising a first step for definition of a first angular speed setpoint of the actuator in a first docking area and a second step for definition of a second angular speed setpoint of the actuator in a second docking area, the first and second angular speed setpoints being different.
    Type: Grant
    Filed: October 13, 2011
    Date of Patent: December 9, 2014
    Assignee: Somfy SAS
    Inventors: Jean-François Bocquet, Anne-Sophie Cleguer, Florian Germain, David Mugnier
  • Patent number: 8901868
    Abstract: In one embodiment, a method includes measuring between two consecutive electrical commutations of a brushless direct-current (BLDC) motor a current through the BLDC motor. One or more pulse-width-modulation (PWM)-configurable signals are driving the BLDC motor. The method includes determining a waveform of the current through the BLDC motor; if the waveform of the current through the BLDC motor comprises a first type, then increasing a duty cycle of each of one or more of the PWM-configurable signals driving the BLDC motor; and, if the waveform of the current through the BLDC motor comprises a second type, then decreasing a time interval between electrical communications of the BLDC motor.
    Type: Grant
    Filed: May 18, 2011
    Date of Patent: December 2, 2014
    Assignee: Atmel Corporation
    Inventor: Markus Ekler
  • Patent number: 8896258
    Abstract: A method for starting an electric motor having a rotor, comprising the following steps:—driving the rotor with a first torque in a first rotational direction, wherein a maximum value of the first torque is not higher than a maximum countertorque acting counter to the rotation of the rotor, so that the rotor comes to a standstill in a first stationary position;—driving the rotor starting from the first stationary position in a second rotational direction that is counter to the first rotational direction until the rotor comes to a standstill in a predefined second stationary position; and—starting from the rotor in the first rotational direction starting from the second stationary position.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: November 25, 2014
    Assignee: BSH Bosch und Siemens Hausgeraete GmbH
    Inventors: Falko Abel, Eberhard Weidner
  • Patent number: 8890460
    Abstract: A servo control device includes a follow-up control unit that controls a control target that drives a mechanical system by a motor, a command function unit that has input therein a phase signal ? indicating a phase of a cyclic operation performed by the control target, and that calculates a machine motion command according to the phase signal ? by a preset first function, a second derivative unit that uses a second function obtained by second-order differentiating the first function with respect to the phase signal to calculate a value of the second function according to the phase signal as a second-order differential base signal, a correction-value computation unit that computes a first command correction value for correcting the motor motion command by using a product of a square value of the phase velocity, the second-order differential base signal, and a first constant, and a correction-value addition unit that calculates the motor motion command based on an added value of the first command correction val
    Type: Grant
    Filed: October 25, 2012
    Date of Patent: November 18, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hidetoshi Ikeda, Yoshihiro Marushita, Koji Mahara, Kiyoshi Hasegawa, Hidemasa Ogi