Plural Diverse Feedback (e.g., Torque And Speed, Load And Speed, Etc.) Patents (Class 318/400.07)
  • Patent number: 10476415
    Abstract: According to an aspect of the present disclosure, a motor drive control device includes a motor drive unit having a plurality of switch elements connected to a power supply source and supplying a driving current to a plurality of phase coils of a motor, a control circuit unit outputting, to the motor drive unit, a drive control signal for operating the plurality of switch elements to sequentially switch energization patterns for the plurality of phase coils, and a current detecting circuit for detecting a voltage value corresponding to a magnitude of the driving current, wherein the control circuit unit includes a first determination unit determining whether a state of overcurrent where a magnitude of the driving current exceeds a predetermined overcurrent threshold occurs based on the voltage value each time an energization pattern is switched, and a second determination unit determining whether driving of the motor is in an abnormal condition based on a determination result of the first determination unit f
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: November 12, 2019
    Assignee: MINEBEA MITSUMI INC.
    Inventors: Masato Aoki, Hiroyuki Kaidu
  • Patent number: 10469017
    Abstract: A method for operating an electrical machine, wherein an inverter of the electrical machine is actuated by a pulse width modulation. In one case, it is provided that a pulse duty factor for the pulse width modulation is determined from a voltage value (d) that is dependent on the desired rotational speed as well as a time-dependent angle value (?). Embodiments of the invention further relate to an electrical machine.
    Type: Grant
    Filed: April 2, 2018
    Date of Patent: November 5, 2019
    Assignee: AUDI AG
    Inventor: Stefan Maiwald
  • Patent number: 10447182
    Abstract: The present invention provides a control device and a control method for a brushless motor, including energization modes for selecting a phase to be energized by pulse width modulation operation from among phases of the brushless motor, and being provided for controlling the rotation speed of the brushless motor by switching between the energization modes based on comparison of a voltage induced in a non-energized phase with its threshold value. In the control device and method, the input voltage of the brushless motor is increased when the duration for which the induced voltage is maintained unchanged or the duration for which the current energization mode is maintained employed reaches a predetermined time. This prevents the brushless motor from being staying in the stopped state, even when the load on the brushless motor abruptly increases while the brushless motor rotates at a speed within an extremely low speed range.
    Type: Grant
    Filed: October 3, 2017
    Date of Patent: October 15, 2019
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Masaki Hano, Naoki Okamoto
  • Patent number: 10404058
    Abstract: A circuit for detecting loss of phase in three-phase power systems. The circuit includes a current sensor and a microprocessor. The current sensors are coupled to respective phases of a three-phase power source configured to supply power to a load. The microprocessor is coupled to the current sensors to process current measurements and detect loss of phase in the three-phase power source.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: September 3, 2019
    Assignee: Regal Beloit America, Inc.
    Inventors: Zachary Joseph Stauffer, Luis D. Morales, Maung Saw Eddison
  • Patent number: 10260559
    Abstract: A motor driving device comprises a first arithmetic section calculating a rotational speed and a magnetic pole electrical angle of a motor rotor, a current command setting section setting a d-axis current command and a q-axis current command in a rotating coordinate dq system based on a difference between the rotational speed and a target rotational speed, a driving command generating section generating a sinusoidal wave driving command based on the d-axis current command, the q-axis current command, the rotational speed and the magnetic pole electrical angle and a PWM signal generating section. When the rotational speed has a positive value indicating a positive rotational state, the current command setting section sets the q-axis current command of acceleration driving, and when the rotational speed has a negative value indicating a reverse rotational state, the current command setting section sets the q-axis current command of deceleration driving.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: April 16, 2019
    Assignee: SHIMADZU CORPORATION
    Inventor: Junichiro Kozaki
  • Patent number: 10252745
    Abstract: There are provided a motor control apparatus, an electric power steering apparatus, and a vehicle, capable of controlling the driving of an electric motor accurately even when a failure occurs in a motor electric angle detecting unit that detects a motor electric angle.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: April 9, 2019
    Assignee: NSK, Ltd.
    Inventor: Kouichi Nampei
  • Patent number: 10232732
    Abstract: A method according to an exemplary aspect of the present disclosure includes, among other things, monitoring a root mean square (RMS) current of a component for a time window, and adjusting a flow of current relative to a battery such that a slope of the RMS current gradually approaches zero as the RMS current approaches an RMS current limit for the time window.
    Type: Grant
    Filed: January 27, 2015
    Date of Patent: March 19, 2019
    Assignee: FORD GLOBAL TECHNOLOGIES, LLC
    Inventor: William Paul Perkins
  • Patent number: 10118607
    Abstract: A computing device implemented method includes receiving one or more signals that represent an angular speed of a permanent magnet electric motor of a hybrid electric vehicle, the one or more signals being provided by an angular sensor connected to the electric motor, receiving a signal representing a voltage from the electric motor, the voltage being a direct axis voltage component of a three-phase motor model, determining if the angular speed is within a predetermined threshold, calculating an error angle representing a correction factor for an alignment of the electric motor based on a ratio of the voltage and the angular speed, storing the correction factor, and determining a binary indication of a status of error angle, and repeating the steps until the binary indication is positive.
    Type: Grant
    Filed: April 10, 2018
    Date of Patent: November 6, 2018
    Assignee: XL Hybrids
    Inventors: Edward Lovelace, Neal Ennis Brenner
  • Patent number: 10116198
    Abstract: An object of the invention is to improve precision of current detection in a switching system having plural switching circuits. A first PWM timing generation circuit generates an edge timing of a PWM signal by using a comparison value and a count value and drives a first switching circuit. A second PWM timing generation circuit generates an edge timing of a PWM signal of plural phases by using a comparison value and a count value and drives a second switching circuit. One of the switching circuits is an inverter circuit of a common shunt type in which a shunt resistor is provided commonly for plural phases. One of the PWM timing generation circuits shifts the generated edge timing so that an interval between an edge timing of one of the circuits and an AD conversion timing of the other becomes equal to or larger than a predetermined reference value.
    Type: Grant
    Filed: December 28, 2017
    Date of Patent: October 30, 2018
    Assignee: RENESAS ELECTRONICS CORPORATION
    Inventor: Shunichi Kaeriyama
  • Patent number: 10110143
    Abstract: A synchronous rectifier circuit can include: a full-bridge rectifier circuit having first, second, third, and fourth switches, where a common node of the first and fourth switches is configured as a first input terminal of the synchronous rectifier circuit, and a common node of the second and third switches is configured as a second input terminal of the synchronous rectifier circuit; a switching control circuit configured to generate a first control signal to control the first and third switches, and a second control signal to control the second and fourth switches; and the switching control circuit being configured to self-adjust the first and second control signals to control operating points of the first, second, third, and fourth switches to be approximately ideal operating points.
    Type: Grant
    Filed: April 1, 2017
    Date of Patent: October 23, 2018
    Assignee: Silergy Semiconductor Technology (Huangzhou) LTD
    Inventors: Wang Zhang, Chen Zhao
  • Patent number: 10014764
    Abstract: Disclosed herein is a method for controlling an inverter. The method includes calculating a maximum current from an output current of each phase of the inverter; determining a variable level upper limit by performing a DQ conversion for the output current of each phase of the inverter and adding a change allowable value to the DQ converted output current; determining a difference between the maximum current for each phase and the variable level upper limit as an output frequency attenuation variation, when the output current of the inverter arrives at the variable level upper limit; and determining an output frequency based on the output frequency attenuation variation.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: July 3, 2018
    Assignee: LSIS CO., LTD.
    Inventors: Jae-Moon Lee, Chun-Suk Yang
  • Patent number: 10001115
    Abstract: A battery powered, personal air sampler is described which uses a closed loop control circuit to adjust the power that is delivered to an internal pump such that a stable and accurate flow rate is maintained independent of changes in inlet pressure due to filter loading. Furthermore, the described personal air sampler provides improved efficiency to the entire electronic and flow pumping system which, in turn functions to optimize the available battery run time of the device.
    Type: Grant
    Filed: April 16, 2015
    Date of Patent: June 19, 2018
    Assignee: IDEAL Industries, Inc.
    Inventors: Aamir Qureshi, Stephen Tearle
  • Patent number: 9929682
    Abstract: A motor control device is configured to drive a first motor that rotates a first rotation body and a second motor that rotates a second rotation body. The motor control device includes a power supply unit, inverters configured to convert an output from the power supply unit to an alternating current and supply the output to the first motor and the second motor, and a control unit configured to drive the second motor using rotor position sensorless control. The control unit may be configured to not start up the second motor during a predetermined operation in which a large current flowing through the first motor is being performed.
    Type: Grant
    Filed: January 6, 2015
    Date of Patent: March 27, 2018
    Assignee: Daikin Industries, Ltd.
    Inventors: Toshiaki Sato, Tetsuya Itagaki
  • Patent number: 9893660
    Abstract: Various embodiments of an electric motor and electronic control for an electric motor are disclosed. An exemplary electric motor comprises a single-phase brushless permanent magnet electric motor. In exemplary embodiments, the electronic motor control is configured to commutate an electric motor at a frequency other than line frequency, perform pulse width modulation, and drive the electric motor with a drive waveform that approximates the counter-electromotive force of the motor.
    Type: Grant
    Filed: August 19, 2016
    Date of Patent: February 13, 2018
    Assignee: Nidec Motor Corporation
    Inventors: Gregory A. Peterson, Michael P. Sullivan, Stephen J. Burton, Gary E. Horst, Keith I. Hoemann, Richard J. Fadler
  • Patent number: 9882516
    Abstract: A method for measuring an offset of a resolver is arranged so as to frequently measure and correct the offset of the resolver by actively performing zero current control of a motor. The method includes steps of: determining whether a torque command value of the motor and a magnetic flux value or reverse magnetic flux value of the motor respectively fall within a first range and a second range, which have been set in advance; controlling the motor to perform zero current control for a preset time period when the torque command value of the motor falls within the first range and the magnetic flux value or reverse magnetic flux value of the motor falls within the second range; and measuring the offset of the resolver for the preset time period.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: January 30, 2018
    Assignee: Hyundai Motor Company
    Inventors: Joo Young Park, Mu Shin Kwak, Jun Mo An, Su Hyun Bae, Sung Kyu Kim
  • Patent number: 9837940
    Abstract: A method for determining the state of a brushless motor having first, second and third phases, in some embodiments, comprises: decoupling said motor from a power source; determining whether said motor is rotating or non-rotating; if the motor is rotating, determining a first phase voltage state relative to a common voltage and a second phase voltage state relative to the common voltage, said first phase and second phase voltage states determined when a third phase voltage is within a predetermined range of said common voltage; and if the first phase voltage state and the second phase voltage state are the same, repeating said determination as to whether the motor is rotating or non-rotating.
    Type: Grant
    Filed: June 5, 2015
    Date of Patent: December 5, 2017
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventor: Fumio Kumazawa
  • Patent number: 9768719
    Abstract: In one aspect, an apparatus includes a motor and inverter configured to provide input power to the motor and a data store comprising at least one entry including a first torque command, a first motor speed, and a first DC voltage value. The first torque command and the first motor speed and the first DC voltage value are associated with a first current output. The apparatus includes a processor configured to receive a torque input, a DC voltage input, and a motor speed input and determine an output current associated with the torque input, the DC voltage input, and the motor speed input, correct the output current to be within a voltage constraint of the motor when the DC voltage input is than a reference voltage at the motor and output the corrected output current to cause the inverter to provide the input power to the motor.
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: September 19, 2017
    Assignee: FARADAY&FUTURE INC.
    Inventors: Mengwei Li Campbell, Steven E. Schulz
  • Patent number: 9762164
    Abstract: In one aspect, an apparatus includes a motor and inverter configured to provide input power to the motor. The apparatus may also include a data store comprising at least one entry including a first torque command, a first motor speed, and a first DC voltage value, where the first torque command and the first motor speed and the first DC voltage value are associated with a first current output and a processor. The processor receives a torque input, a DC voltage input, and a motor speed input and identifies the current output associated with the torque input, the DC voltage input, and the motor speed input based on another motor speed different than the motor speed input and another DC voltage different than the DC voltage input and the motor speed input, and output the determined current output to cause the inverter to provide the input power to the motor.
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: September 12, 2017
    Assignee: FARADAY & FUTURE INC.
    Inventors: Mengwei Li Campbell, Steven E. Schulz
  • Patent number: 9709289
    Abstract: A control unit controls a first DC motor and a second DC motor by detecting a rotational position thereof and includes first control means and second control means. The first control means performs a detection of the origin position pattern by controlling each DC motor to rotate toward one side within a detectable range. In case where the rotational position reaches one end of the detectable range, the second control means performs a detection of the origin position pattern by controlling the DC motor to rotate oppositely from the one side when the other DC motor is stopping, and performs a detection of the origin position pattern by controlling the DC motor to rotate oppositely from the one side after the rotational position of the other DC motor reaches the one end of the detectable range when the other DC motor is rotating.
    Type: Grant
    Filed: April 1, 2013
    Date of Patent: July 18, 2017
    Assignee: DENSO CORPORATION
    Inventor: Takayuki Fukuda
  • Patent number: 9692332
    Abstract: A failure in the activation, of a motor, caused by external noise superimposed on an induced voltage is reduced. A detection circuit is connected to a connection node provided between an upper-arm switching element and a lower-arm switching element, and detects the induced voltage of a fan motor before activation. The switching controller activates the fan motor in accordance with a result of detection by the detection circuit. While the detection circuit detects the induced voltage, the switching controller performs switching control which involves alternately turning ON and OFF of the lower-arm switching element.
    Type: Grant
    Filed: February 17, 2015
    Date of Patent: June 27, 2017
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Kentarou Taoka, Shinichi Ishizeki, Motonobu Ikeda
  • Patent number: 9692331
    Abstract: BLDC adaptive zero crossing detection compares BEMF voltages from a floating phase of a BLDC motor to a reference voltage, measures a rising time interval during a rising BEMF period when the BEMF voltages are greater than the reference voltage, and a falling time interval during a falling BEMF period when the BEMF voltages are less than the reference voltage. The reference voltage is adjusted so that the rising and falling time intervals are substantially the same, thereby causing the drive voltage to be in phase with the motor self-generated voltage, thus ensuring maximum efficiency of the BLDC motor.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: June 27, 2017
    Assignee: MICROCHIP TECHNOLOGIES INCORPORATED
    Inventor: Ward R. Brown
  • Patent number: 9667176
    Abstract: In accordance with an embodiment, a method for driving a motor includes generating a position indicator signal in response to a signal from the at least one Hall sensor, wherein the position indicator signal has a first period. A phase shift value is generated using the position indicator signal. The position indicator signal is used to generate an adjusted position indicator signal in response to the phase shift value. In accordance with another embodiment, a lead angle adjustment circuit includes a counter coupled to a subtractor circuit through a multiplier circuit. A storage register is coupled to the output of the counter and to an input of a slope determination circuit, wherein the slope determination circuit is coupled to a first external pin of the lead angle adjustment circuit. A multiplier circuit is coupled to the slope determination circuit and to a second external pin.
    Type: Grant
    Filed: December 20, 2014
    Date of Patent: May 30, 2017
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventor: Takashi Ogawa
  • Patent number: 9608650
    Abstract: The present disclosure provides a single-phase PLL controlling method and a single-phase PLL controlling device. The device includes a first FIR filter, a second FIR filter and a Park converter. The first FIR filter and the second FIR filter are configured to perform FIR filtration on a collected power grid voltage signal so as to acquire filtered signals, and output the filtered signals to the Park converter. A filtered signal V? acquired by the first FIR filter and a filtered signal V? acquired by the second FIR filter form a set of virtual two-phase signals in an ?? coordinate system. The Park converter is configured to perform Park conversion on the filtered signal V? and the filtered signal V?, so as to acquire a set of two-phase signals Vd and Vq in a dq coordinate system.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: March 28, 2017
    Assignees: BOE TECHNOLOGY GROUP CO., LTD., BEIJING BOE ENERGY TECHNOLOGY CO., LTD.
    Inventors: Jin Li, Xingbin Song, Xiaoyan Han
  • Patent number: 9515587
    Abstract: A phase detector includes a crossing-point phase detection circuit to compare signals levels of pairs of sensor signals and output crossing-point phase detection signals indicating phases of crossing points between the pairs of the sensor signals, each having a signal level corresponding to a rotational position of a rotor of a motor having coils, a crossing-point level detection circuit to output crossing-point level signals indicating crossing-point levels detected, a signal selection circuit to select one of the sensor signals as a selection signal, a phase detection circuit to detect that a signal level of the selection signal has reached a threshold level, and output a phase data signal indicating a phase of the rotor corresponding to the threshold level, and an in-phase level adjustment circuit to adjust and output in-phase levels of the sensor signals to approach each of the crossing-point levels to a predetermined signal level.
    Type: Grant
    Filed: February 27, 2015
    Date of Patent: December 6, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventor: Tomohiko Kamatani
  • Patent number: 9473059
    Abstract: A control apparatus controls an AC motor by detecting current passing through one phase. The apparatus includes an upper controller which includes a torque command calculation section, and a torque monitoring section monitoring torque to determine whether the torque is within a range, and a lower controller which controls current supply to an inverter based on a torque command value to control the motor, and which acquires information on a current-supply state and a rotation state of the motor and transmits information on a control state to the upper controller. At least one of the controllers estimates a current estimate value of an estimated phase or a d-q axis current estimate value based on a current detection value of the one phase and an electrical angle, and calculates information for monitoring torque based on the current estimate value. The torque monitoring section monitors the torque based on the information.
    Type: Grant
    Filed: November 5, 2014
    Date of Patent: October 18, 2016
    Assignee: DENSO CORPORATION
    Inventors: Ryuji Omata, Takahumi Oowada
  • Patent number: 9393667
    Abstract: An angle grinder including at least one boost mode unit configured to provide a boost mode, and a switching-over unit configured to switch over between a conventional mode and the boost mode.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: July 19, 2016
    Assignee: Robert Bosch GmbH
    Inventors: Cornelius Boeck, Joachim Schadow, Joerg Maute, Florian Esenwein, Manfred Lutz, Daniel Barth
  • Patent number: 9369072
    Abstract: A controlling circuit of the brushless motor driving circuit turns on a switch circuit to provide an electrical conduction between a fixed potential and a neutral point or an electrical conduction between the fixed potential and a first to third output nodes, in a case where the first to third output node bring into a floating state when a three-phase brushless motor is rotating.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: June 14, 2016
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Tadashi Asukai
  • Patent number: 9211807
    Abstract: Even when the effective radii of wheels differ from each other because of a change in tire pneumatic pressure, the difference in driving force between left and right drive wheels are substantially zeroed to suppress a turning force to thereby increase the traveling stability. The use is made of a corrector for correcting a command value to be outputted to a drive circuit for an electric drive motor for each of the drive wheels. This corrector receives the steering angle, the respective numbers of revolutions of the drive wheels and an electric drive motor current and corrects with the use of the steering angle as measured with respect to a traveling direction so that command values relative to the drive wheels may have such a relation that the turning force induced in a vehicle as a result of the difference in effective radius between the drive wheels can be suppressed.
    Type: Grant
    Filed: June 5, 2012
    Date of Patent: December 15, 2015
    Assignee: NTN CORPORATION
    Inventors: Koichi Okada, Yusuke Makino
  • Patent number: 9109604
    Abstract: A control circuit controls a fan to cool an integrated baseboard management controller (iBMC) in a server. The control circuit includes a state determination module. When the server is powered off and the iBMC is operating, the state determination module receives low level signals from a power supply unit (PSU) and the iBMC. The state determination module connects the PSU and the fan, such that the fan is operating. When the server and the iBMC are powered off, the state determination module receives a low level signal from the PSU and a high level signal from the iBMC. The state determination module disconnects the PSU from the fan, turning the fan off. When the server is operating, the state determination module receives a high level signal from the PSU. The state determination module disconnects the PSU from the fan, turning the fan off.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: August 18, 2015
    Assignees: HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD., HON HAI PRECISION INDUSTRY CO., LTD.
    Inventors: Kang Wu, Bo Tian
  • Patent number: 9041328
    Abstract: An electrical controller for electric motors is provided. A control system for an electric motor comprises a supply for supplying excitation current to different windings of the motor at any given time. Furthermore, the amplitude of the excitation current is independently variable of the timing and duration of the application of the excitation current to the windings. This allows increased control of the motor and facilitates the operation of the motor at high mechanical and/or electrical speeds.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: May 26, 2015
    Assignee: AERISTECH LIMITED
    Inventors: Bryn Geoffrey Roddick Richards, Wenshan Hu
  • Patent number: 9041331
    Abstract: A motor controlling apparatus includes a first target torque value calculator, a frequency detector, a second target torque value calculator, a torque command value calculator, a torque limiter, and a controller. The first target torque value calculator calculates a first target torque value, which is a target value of an output torque of a motor. The frequency detector detects a motor rotational frequency. The second target torque value calculator calculates a second target torque value based on the rotational frequency. The torque command value calculator mathematically combines (e.g., adds) the first and target torque values to calculate a torque command value. The torque limiter sets the signs of the first target torque value and the torque command value to be equal to limit the torque command value according to the first target torque value. The controller controls the motor based on the limited torque command value.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: May 26, 2015
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Kengo Fujiwara, Ken Ito
  • Patent number: 9041324
    Abstract: A control apparatus of an AC motor improves an electric current estimation accuracy of the AC motor. The control apparatus includes an electric current estimation unit that repeatedly performs an inverted dq conversion, a dq conversion, and a correction process. Based on a d/q axis electric current estimate values of a previous cycle, the inverted dq conversion calculates an electric current estimate value of a sensor phase. The dq conversion calculates a d/q axis electric current correction values based on an electric current estimation error of the sensor phase, which is derived from the electric current estimate value and the electric current detection value detected by an electric current detector. The correction process calculates the d/q axis electric current estimate values of a current cycle by correcting the d/q axis electric current estimate values of the previous cycle by using the d/q axis electric current correction values.
    Type: Grant
    Filed: April 22, 2013
    Date of Patent: May 26, 2015
    Assignee: DENSO CORPORATION
    Inventors: Takashi Suzuki, Takeshi Itoh, Hirofumi Kako
  • Patent number: 9024565
    Abstract: An anti-rebounding control apparatus is provided, which includes an anti-rebounding controller outputting a first command for setting a torque limit value to “0” if an electric motor speed value is equal to or smaller than an upper threshold value and equal to or larger than a lower threshold value in the case where a speed command value of “0” is input and outputting a second command for setting the torque limit value to a maximum value if the electric motor speed value is smaller than the lower threshold value, a torque regulator setting the torque limit value to “0” when the first command is input and setting the torque limit value to the maximum value when the second command is input, and an electric motor inverter intercepting a power that is supplied to an electric motor if the torque limit value is set to “0” and re-supplying the power to the electric motor if the torque limit value is set to the maximum value.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: May 5, 2015
    Assignee: Volvo Construction Equipment AB
    Inventor: Ji-Yun Kim
  • Patent number: 9024568
    Abstract: A motor speed controller controls a motor speed to generate a phase reference pulse; generates a FG pulse per rotary angle of the motor; detects a difference between the number of phase reference pulses and the number of FG pulses for output as an integer number phase difference; detects and measures a time difference between an edge of the phase-reference pulse and an edge of the FG pulse in units of the reference clock for output as a decimal fraction phase difference; adds the integer number phase difference to the decimal fraction phase difference at a predetermined ratio for output as a phase difference; and controls driving of the motor in accordance with the phase difference.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: May 5, 2015
    Assignee: Ricoh Company, Ltd.
    Inventor: Haruyuki Suzuki
  • Patent number: 9018872
    Abstract: To provide a motor control circuit that variably controls the speed of a motor, in which an appropriate advance angle value corresponding to the speed of the motor that is set can be automatically set. The motor control circuit according to the present invention includes an advance angle setting means that adds a reference advance angle value to an advance angle correction value obtained by multiplying a proportional coefficient by a correction amount and outputs an advance angle setting signal, and an advance angle setting correction means that uses a ratio of a correction reference period relative to a period of a reference signal input from the outside as a correction amount and corrects the reference advance angle value by an advance angle correction value obtained by multiplying the correction amount by a predetermined proportional coefficient of the advance angle setting means.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: April 28, 2015
    Assignees: Minebea Co., Ltd., Panasonic Corporation
    Inventors: Tomohiro Inoue, Yuji Hamada
  • Patent number: 9007005
    Abstract: Disclosed is a system and method of controlling an inverter to reduce noise in an eco-friendly vehicle. In the method, at least one of a current motor torque and a current motor speed is monitored in real-time. It is determined whether or not the at least one of the current motor torque and the current motor speed corresponds to a noise occurrence range set to a current switching frequency. A changed switching frequency value corresponding to the at least one of the current motor torque and the current motor speed is calculated when the at least one of the current motor torque and the current motor speed corresponds to the noise occurrence range. A PWM signal is generated using the changed switching frequency value to control an inverter.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: April 14, 2015
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Yu Hyun Sung, Seong Yeop Lim, Jeong Min Shin
  • Patent number: 8981702
    Abstract: Input-output linearization (IOL) and extended state observer (ESO) techniques are applied to a Field Oriented Control (FOC) for Permanent Magnet Synchronous Motors (PMSM). In one such approach, at least one gain value is determined based at least in part on a given bandwidth value. Operating parameters for the motor are determined based on the at least one gain value and information from a current sensor regarding motor current. Control signals used to the control the motor are determined based on the determined operating parameters. Accordingly, automated control can be effected through setting a bandwidth value through the implementation of IOL and ESO techniques.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: March 17, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Ashish S. Katariya, David P. Magee
  • Publication number: 20150048768
    Abstract: A method for determining the rotor position and the rotational speed of a rotating field machine, including, based on Hall sensor signals, a step of determination of a sector in which a rotor of the rotating field machine is situated and a step of determination of a preliminary rotational speed of the rotating field machine. In a step of determination, the rotor position and the rotational speed are determined based on the sector and on the preliminary rotational speed, an observer of the rotating field machine being used at least for the determination of the rotational speed.
    Type: Application
    Filed: August 3, 2012
    Publication date: February 19, 2015
    Inventors: Martin Braun, Thomas Gaberan, Gilles Schmitt
  • Publication number: 20150015170
    Abstract: A system for determining the angular position of a synchronous motor includes an encoder with a friction wheel engaging a rotating surface of the motor. The friction wheel is spun by the rotation of the motor, and the encoder generates a signal corresponding to the angular position of the friction wheel. An independent, sensor is provided to generate a pulse once per revolution of the motor. The independent sensor detects the presence of a target on the rotating surface of the motor and generates the pulse when the target is proximate to the sensor. A controller receives the signal corresponding to the angular position of the friction wheel as well as the pulse generated by the independent sensor to determine the angular position of the motor. The controller compensates the angular position of the motor each time the pulse is generated, correcting accumulated position error.
    Type: Application
    Filed: July 12, 2013
    Publication date: January 15, 2015
    Inventors: John Backman, Garry Anderson
  • Publication number: 20150002062
    Abstract: Provided is a motor including a motor driving unit outputting a plurality of switching signals and any one of estimated three-phase voltages, in response to a control signal and a compensated position signal; a pulse width modulation (PWM) inverter outputting three-phase voltages and any one of estimated three-phase currents corresponding to the one estimated phase voltage, in response to the plurality switching signals; a motor unit operating based on the three-phase voltages and outputting a position signal according to the operation; and a position signal compensation unit receiving the position signal, the estimated phase voltage and the estimated phase current, detecting a phase difference between the estimated phase voltage and the estimated phase current and compensating for the position signal in response to the detected phase difference.
    Type: Application
    Filed: January 6, 2014
    Publication date: January 1, 2015
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Minki KIM, Yil Suk YANG, Jimin OH, Jung Hee SUK, Sewan HEO
  • Patent number: 8897930
    Abstract: This application describes the software invented to control an electric motor system. The electric motor system is mounted on one or more aircraft main wheels or nose wheels to drive an aircraft independently on the ground without aircraft engines or tow vehicles. The software uses closed-loop control together with several other control laws to operate the drive motor or motors. Knowledge of the current operating state of the drive motor, together with knowledge of the commands given to taxi forward, taxi in reverse, or brake in reverse, is used to configure the motors to optimal operating parameters. The software architecture is described along with the pilot interface and many details of software implementation.
    Type: Grant
    Filed: July 27, 2011
    Date of Patent: November 25, 2014
    Inventor: Janice Ilene Bayer
  • Patent number: 8872454
    Abstract: In a control unit that controls a control amount of a rotary device by controlling on and off states of switching elements of a power converting circuit, a relative rate predicting section temporally sets operation states of the power converting circuit and predicts a relative rate of a control amount according to each of the temporally set operation states relative to a command value thereof. Each of the operation states is indicated by a voltage vector defined by the on and off states of the switching elements. A determining section determines an operation state of the power converting circuit based on the relative rate predicted by the relative rate predicting section. An operating section operates the power converting circuit to the operation state determined by the determining section.
    Type: Grant
    Filed: May 14, 2012
    Date of Patent: October 28, 2014
    Assignee: Denso Corporation
    Inventor: Akihiro Imura
  • Patent number: 8847526
    Abstract: A method for determining a direction of rotation for an electronically commutated motor (ECM) is described. The motor is configured to rotate a blower and the method comprises rotating the blower using the ECM and determining if the resulting blower rotation is indicative of the desired direction of rotation for the blower.
    Type: Grant
    Filed: July 15, 2013
    Date of Patent: September 30, 2014
    Assignee: Regal Beloit America, Inc.
    Inventors: Stephen Solan, Jr., Brian L. Beifus, Roger C. Becerra
  • Patent number: 8847527
    Abstract: An estimation section calculates estimated currents corresponding to switching modes, which are provisionally set by a mode setting section. A mode determination section determines one of modes, which has a smallest difference between the estimated currents and command currents, to be a final switching mode. A drive section drives an inverter in the switching mode determined by the determination section. The estimation section uses transient-state inductances as coefficients of time differentiation of currents in voltage equations used for estimation of the estimated currents. These are different from steady-state inductances, which are coefficients of multiplication of currents and electric angular velocity.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: September 30, 2014
    Assignee: Denso Corporation
    Inventor: Tomoya Takahashi
  • Patent number: 8836256
    Abstract: A drive system has a switched reluctance motor (SR motor) and a control system configured to determine an estimated total torque of SR motor as a function of the phase voltages and phase currents of the phases of the SR motor.
    Type: Grant
    Filed: July 12, 2012
    Date of Patent: September 16, 2014
    Assignee: Deere & Company
    Inventors: Zimin W. Vilar, Chris J. Tremel
  • Patent number: 8823302
    Abstract: A control apparatus for a switching circuit includes a controller, a target-rotational-speed acquiring device, a target-torque acquiring device, and an ON-time varying device. The controller is configured to turn on a bidirectional conduction switching device provided parallel to a reverse conducting device through which a commutation current flows. The target-rotational-speed acquiring device is configured to acquire a target rotational speed of an alternating current motor. The target-torque acquiring device is configured to acquire a target torque of the alternating current motor. The ON-time varying device is configured to vary, on a basis of the target rotational speed and the target torque, an ON time period during which the bidirectional conduction switching device provided parallel to the reverse conducting device through which a commutation current flows is turned on.
    Type: Grant
    Filed: May 28, 2012
    Date of Patent: September 2, 2014
    Assignee: Honda Motor Co., Ltd.
    Inventor: Junichi Hashimoto
  • Publication number: 20140232310
    Abstract: A control system (14) for controlling a brushless electric motor (1) for an automotive power actuator (10), having a rotor (3) operable to rotate with respect to stator windings (2a, 2b, 2c), the control system (14) is provided with: a position sensing unit (4a-4c, 30) coupled to the rotor (3), to sense its angular position and to provide a sensed position (?); and a generation unit (24), to generate driving voltages and/or currents for the stator windings (2a, 2b, 2c), as a function of the angular position of the rotor (3). A position estimation module (25) is coupled to the position sensing unit (4a-4c, 30), to receive the sensed position (?) and to correct the value of the sensed position (?), thereby providing a corrected angular position (?r) to the generation unit (24).
    Type: Application
    Filed: February 12, 2014
    Publication date: August 21, 2014
    Inventors: Marco Bartalucci, Marco Marlia
  • Publication number: 20140225540
    Abstract: In a motor control apparatus for controlling an AC motor with an inverter, a current estimation value is calculated based on a current detection value of one phase of the motor and a rotation angle of the motor. A first voltage command is calculated based on the current estimation value and a current command value related to driving of the motor. A second voltage command is calculated based on information related to an actual behavior of the motor. The information depends on the rotation angle or a phase angle of a current command vector. When a rotation speed of the motor is greater than a threshold, a drive signal related to driving of the inverter is generated based on the first voltage command. When the rotation speed is not greater than the threshold, the drive signal is generated based on the second voltage command.
    Type: Application
    Filed: February 6, 2014
    Publication date: August 14, 2014
    Applicant: Denso Corporation
    Inventors: Ryuji OMATA, Takeshi ITOH, Hirofumi KAKO
  • Patent number: 8803454
    Abstract: Embodiments of the present invention permit the optimization of torque control of a permanent magnet machine including obtaining instantaneous terminal voltages of the machine, transforming the instantaneous terminal voltages to a zero direct axis voltage and a non-zero quadrature axis voltage, using a mathematical transformation, regulating the electrical frequency of the permanent-magnet machine such that the zero direct-axis voltage is adjusted to have a value of zero, determining a non-final electrical angle of the permanent-magnet machine by applying an integrator to the regulated electrical frequency of the machine, determining a final electrical angle of the of the machine by integrating the non-final electrical angle and an electrical angle from a previous calculation cycle, and regulating the current vector of the machine such that the current vector is perpendicular to the final electrical angle of the machine, thereby optimizing the torque of the machine.
    Type: Grant
    Filed: July 12, 2012
    Date of Patent: August 12, 2014
    Assignee: AeroVironment, Inc.
    Inventors: Zaher Abdallah Daboussi, Scott Garrett Berman
  • Patent number: 8796964
    Abstract: A direct-current motor is disclosed, preferably in the form of an EC motor, which has a matching arrangement in order to vary its rotation-speed/torque characteristic, having a permanently effective control circuit for controlling the motor, which control circuit is programmed such that the rotation-speed/torque characteristic is permanently varied with respect to rated operation or operation with the matching arrangement.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: August 5, 2014
    Assignee: C. & E. Fein GmbH
    Inventors: Lothar Dietl, Alfred Schreiber, Richard E. Geitner