Frequency- Or Phase-modulated Systems Patents (Class 318/606)
  • Patent number: 10655621
    Abstract: A control system and method of a VFD-based pump. The control system controls an electric motor via a VFD, and the electric motor drives the pump. The control system comprises: an anti-ripple injection module for injecting an anti-ripple signal into a control path, the anti-ripple signal causing pressure ripples in the pump output to be at least partially cancelled. Further a pump system, comprising: a VFD, an electric motor, and a pump, wherein the VFD comprises the control system stated above.
    Type: Grant
    Filed: June 27, 2014
    Date of Patent: May 19, 2020
    Assignee: EATON INTELLIGENT POWER LIMITED
    Inventors: Yilun Chen, Xiaomeng Cheng
  • Patent number: 10630218
    Abstract: A motor control device including: an operation control part that generates a torque command based on an operation command, and controls a rotational position and/or rotational speed of the spindle; a current control part that generates an excitation current command to control secondary magnetic flux of the induction motor, and a torque current command to control torque of the induction motor based on the torque command; a change detection part that detects a change in operation command requiring increasing the secondary magnetic flux of the induction motor; a magnetic flux amplification part that performs magnetic flux amplification to temporarily increase the excitation current command or a magnetic flux command in the current control part, in a case of a change in the operation command being detected; and a gain change part that changes gain of the operation control part when performing magnetic flux amplification.
    Type: Grant
    Filed: October 18, 2018
    Date of Patent: April 21, 2020
    Assignee: Fanuc Corporation
    Inventors: Shoutarou Hashimoto, Yuuki Morita
  • Patent number: 9998048
    Abstract: A motor control apparatus that vector-controls a sensorless motor includes an estimating unit configured to obtain an estimated phase value by estimating a phase of a rotor in the sensorless motor, and a generating unit configured to generate, from the estimated phase value and a phase command value of the rotor, a phase conversion value that is used for a coordinate conversion between a rotary coordinate system and a static coordinate system in the vector control. The generating unit is further configured to output the phase command value as the phase conversion value when the rotor is caused to start to rotate, and change the phase conversion value so that the phase conversion value approaches the estimated phase value from a predetermined timing after the rotor is caused to start to rotate.
    Type: Grant
    Filed: April 24, 2015
    Date of Patent: June 12, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yoko Maeshima
  • Patent number: 9628135
    Abstract: The invention relates to a method for automatically adjusting a single-input-port and single-output-port tunable matching circuit, for instance a single-input-port and single-output-port tunable matching circuit coupled to an antenna of a radio transceiver. The invention also relates to an automatic tuning system using this method. An automatic tuning system comprises: one user port; one target port; a sensing unit; a single-input-port and single-output-port tunable matching circuit comprising one or more adjustable impedance devices; a signal processing unit which delivers a tuning instruction as a function of one or more temperature signals and as a function of two or more real quantities depending on an impedance seen by the target port; and a tuning control unit which delivers tuning control signals, the reactance of each adjustable impedance device of the tunable matching circuit being determined by at least one of the tuning control signals.
    Type: Grant
    Filed: November 23, 2016
    Date of Patent: April 18, 2017
    Assignee: TEKCEM
    Inventors: Frédéric Broyde, Evelyne Clavelier
  • Patent number: 9595904
    Abstract: An apparatus for modifying voltage command for detecting output current in inverter is disclosed to modify a PWM voltage command by determining a sector in a voltage hexagon, the sector having a PWM voltage command therein, by comparing the PWM voltage command, determining an area, the area having the PWM voltage command, within a current detection disabled area by converting a minimum sampling time to a minimum sampling PWM and using the converted minimum sampling PWM, and determining an adjusting voltage and a restoring voltage using a minimum injection voltage based on the determined area.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: March 14, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Eun Woo Lee
  • Patent number: 9479097
    Abstract: Provided is a sensorless BLDC motor apparatus for providing a drive current allowing the rotor of the BLDC motor to be aligned in a predetermined direction during an initial position setting section (or for a first period of time), and providing a drive current allowing a frequency thereof to be varied at predetermined time intervals so as to accelerate the rotational speed of the BLDC motor during an open loop section (or for a second period of time), and a method using the same.
    Type: Grant
    Filed: March 21, 2014
    Date of Patent: October 25, 2016
    Assignee: LG ELECTRONICS INC.
    Inventors: Kyelyong Kang, Jaemin Kim, Jinseok Hu, Shinhyun Park
  • Patent number: 9385647
    Abstract: A system including a motor loss reducing controller system utilizing input band-shifting, an integral control architecture and inverse band-shifting is disclosed. The motor loss reducing controller system may provide correction of harmonic currents flowing to a PM motor from a motor controller. The compensation is added to the PWM voltage command signals. Within a compensator, d-axis and q-axis current feedback signals are frequency shifted down by n times the fundamental frequency. This converts the initial motor stationary harmonic currents into DC values. The frequency shifting is completed by multiplying the feedback signal by sine and cosine carrier signals of the shifted frequency. An integral controller may cancel any component of error at a desired DC value. An inverse frequency-shift transformation is applied to the output of the I controller in order to shift the command output signal back to the original reference frame.
    Type: Grant
    Filed: August 20, 2014
    Date of Patent: July 5, 2016
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventor: Adam Michael White
  • Patent number: 9054586
    Abstract: Power conversion systems and operating methods are presented in which an active front end rectifier is operated in a boost mode using discontinuous pulse width modulation in a first range of DC bus voltage boost amount, and continuous space vector pulse width modulation is used in a second range, with the ranges being correlated to output derating with respect to filter inductor magnetics in the first range and to rectifier switching loss derating and the second range.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: June 9, 2015
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Lixiang Wei, Yogesh Patel
  • Patent number: 9018885
    Abstract: A motor controller receiving as input an encoder signal changing in response to a driving position of a motor, outputting a motor driving command in response to the encoder signal to control at least one of the driving position or a driving velocity of the motor, includes an interrupt processing section to execute interrupt operations every prescribed interrupt cycle, a low-frequency processing section to selectively execute a subset of the interrupt operations every prescribed number of the interrupt cycles, and a high-frequency processing section to execute another subset of the interrupt operations every prescribed interrupt cycle, wherein the high-frequency processing section executes at least an operation to detect the driving position indicated by the encoder signal, wherein the low-frequency processing section executes at least an operation to generate the motor driving command.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: April 28, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Haruyuki Suzuki, Takuya Murata
  • Publication number: 20150091490
    Abstract: An electronic control by frequency inverter of the displacement system of an irrigation or fertirrigation set is made up of structured pipelines, in which the water distribution sprayers are mounted, and which are coupled to each other, and supported by movable towers which are moved by gear motors driving by means of cardans the wheel gear that in turn drive pneumatic wheels, moving the structure about a fixed point, or pivot point, which is the central tower. The driving of the gear motors of each tower is performed by an electric control unit via a frequency inverter, with analogic signal, preferably a potentiometer, or position encoder digital sensor or optical sensor of alignment with relation to the front and back tower.
    Type: Application
    Filed: September 9, 2014
    Publication date: April 2, 2015
    Applicant: Fockink Indústrias Elétricas Ltda
    Inventors: Kurth HEUERT, Maurício OBERDORFER, Aldo Fernando BAUM
  • Patent number: 8917043
    Abstract: A motor control circuit and associated techniques can adjust a phase of a motor drive to keep a rotational reference position of an electric motor at the same relative phase as a zero current in a motor winding at different motor speeds and as the motor accelerates and decelerates. In some embodiments, a particular circuit and technique can be used to detect the zero current in 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: 8912742
    Abstract: An ECU executes a program including a step of detecting the rotation speed of a motor, a step of determining the diffusion width of carrier frequency, a step of determining the carrier frequency based on the determined diffusion width, a step of generating a carrier signal based on the determined carrier frequency, and a step of executing pulse width modulation based on an AC voltage command and the carrier signal.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: December 16, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Ryosuke Ohsugi
  • Patent number: 8825440
    Abstract: A resolver signal converter and a resolver signal conversion method amplify and perform analogue-digital conversion on a sine wave output from a resolver; thereafter, among frequency components of the sine wave output, pass and thereby extract a predetermined bandwidth of which the center frequency is the frequency of an excitation signal, by means of a band-pass filter; sample the sine wave output while synchronizing the sine wave output with a reference signal which is based on the excitation signal; and generate a detection angle signal sine value from the sampled signal. Similarly, a detection angle signal cosine value is generated from a cosine wave output from the resolver. A detection angle is calculated based on the detection angle signal sine value and the detection angle signal cosine value.
    Type: Grant
    Filed: December 27, 2010
    Date of Patent: September 2, 2014
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventor: Masahiro Yamada
  • Patent number: 8786242
    Abstract: A method for sensing and compensating for variances in load and voltage in a closed loop voice coil system is described. A load in a system which included a supply voltage and the load, which includes an inductive element, is excited with a known duty cycle for a time interval. At an end time, at the end of the time interval, the current which flows through the load is sensed. A lumped term based at least in part on the time interval and a change in the load current during the time interval is calculated. The lumped term is representative of the supply voltage and one or more electrical characteristic of the load. A control signal to control a voltage applied to the load may be generated based at least in part on the lumped term. Apparatus and computer-readable media are also described.
    Type: Grant
    Filed: February 26, 2009
    Date of Patent: July 22, 2014
    Assignee: Enfield Technologies, LLC
    Inventor: Daniel S. Cook
  • 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: 8723456
    Abstract: A procedure for controlling actuators within an on-board power system, which provides different operating voltages and temporal on-board power voltage changes. The actuator or actuators are controlled with different pulse-width modulated control signals, whereby the pulse-width and the cycle duration of the control signals can be adjusted independent of each other and are adjusted independent of the actually applied on-board power voltage. Control signals for the actuators can be specified by a control unit. The actuator or actuators can be controlled with the aid of the control unit by different pulse-width modulated control signals, whereby the pulse-width and the cycle duration of the control signals can be adjusted independent of each other; and the control unit provides devices for detecting the actually applied on-board power voltage and driver units.
    Type: Grant
    Filed: January 19, 2011
    Date of Patent: May 13, 2014
    Assignee: Robert Bosch GmbH
    Inventors: Uwe Daemmrich, Guido Kalbas
  • Patent number: 8638053
    Abstract: Motor control circuits and associated methods to control an electric motor provide an ability to synchronize a rotational speed of the electric motor with an external clock signal, resulting in reduced jitter in the rotational speed of the electric motor.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: January 28, 2014
    Assignee: Allegro Microsystems, LLC
    Inventor: Chee-Kiong Ng
  • Patent number: 8624532
    Abstract: A system for controlling a motor (3) includes a driver circuit (5) for generating a drive voltage (v) to generate a phase current (i) in the motor. Phase current sensing circuitry (10,21) digitizes the phase current. A first circuit (23) provides a reconstructed digital representation of a BEMF signal (vbemf) of the motor to generate an error-corrected synchronization signal (SYNC) in response to the phase current and a detected error in the motor speed, an amplitude feedback signal (15), and information (iR,iL,?iL,vL) indicative of a resistance (Rm) and an inductance (Lm) of the motor. A motor drive signal (15) having an error-corrected frequency is generated in response to the synchronization signal. A PWM circuit (16) produces a PWM signal (17) having a frequency equal to the error-corrected frequency of the synchronization signal (SYNC) and a duty cycle controlled according to the detected error.
    Type: Grant
    Filed: August 19, 2011
    Date of Patent: January 7, 2014
    Assignee: Texas Instruments Incorporated
    Inventors: Yew Tat Chuah, Yisong Lu
  • Patent number: 8497647
    Abstract: A control system and method for a multi-phase motor substantially reduces or eliminates jitter resulting from. drive mismatch by replacing a conventional trapezoidal drive profile with a drive profile that causes the voltage applied across active phases of the motor to match the back-EMF across those phases. In an ideal motor, the back-EMF is substantially sinusoidal, and although the drive profile applied to each phase is not truly substantially sinusoidal, the drive voltage across the active phases is substantially sinusoidal. In a non-ideal motor, the back-EMF is not truly sinusoidal and the drive profiles applied to each phase are calculated to cause the drive voltage across the active phases to match the back-EMF across those phases.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: July 30, 2013
    Assignee: Marvell International Ltd.
    Inventors: Ravishanker Krishnamoorthy, Foo Leng Leong
  • Patent number: 8497653
    Abstract: An amount of a motor drive current is controlled to an appropriate value. Two coils are provided, and a rotor is rotated by the coils by setting different phases for the supplied currents to the two coils. During a phase where one of the coils is in a high-impedance state, an induced voltage generated in the coil is detected. According to the state of the induced voltage, an output control circuit controls the amounts of the motor drive currents supplied to the two coils.
    Type: Grant
    Filed: January 28, 2010
    Date of Patent: July 30, 2013
    Assignee: Semiconductor Components Industries, LLC
    Inventors: Kosaku Hioki, Kazumasa Takai, Takeshi Naganuma, Yoshihiro Niwa
  • Patent number: 8456126
    Abstract: There is provided a motor control system and motor control method which can shorten settling time by restraining vibration and deviation relative to an advancing direction during operation. Moreover, according to the present invention, it is possible to cause a motor to be operated with an ideal track and, since it is possible to always monitor a present position, it is made easy to cause a plurality of axes to be synchronously operated. The motor control system is provided with a unit generating command waveforms from a jerk data which has significant effects on the vibration relative to the advancing direction, and a unit performing a real time real position control of regenerating future command waveforms according to a deviation amount, while always performing jerk-limit, whereby the vibration and the deviation relative to the advancing direction when the motor operates at high speed are restrained.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: June 4, 2013
    Assignee: Hitachi High-Tech Instruments Co., Ltd.
    Inventors: Mitsuaki Tate, Yasushi Ishii, Masamichi Kihara
  • Patent number: 8378606
    Abstract: Drive voltages to a sensorless brushless DC motor are regulated by varying the width of a single drive pulse (PWM pulse) centered in each of the commutation periods. Switching losses are thereby cut to an absolute minimum because there are only two transitions (on and off) in each drive commutation period. Back EMF zero-cross detectors determine the electrical timing relationships during each electrical cycle. Since the PWM drive pulses are always centered in each of the commutation periods, there will always be back EMF available for measurement of “zero-crossings.” A digital device controls power switching transistors to produce one single PWM pulse during each of the commutation periods.
    Type: Grant
    Filed: April 26, 2010
    Date of Patent: February 19, 2013
    Assignee: Microchip Technology Incorporated
    Inventor: Ward R. Brown
  • Patent number: 8339094
    Abstract: Methods, system and apparatus are provided for overmodulation of 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 to optimize voltage command signals that control a five-phase inverter module to increase output voltages generated by the five-phase inverter module.
    Type: Grant
    Filed: March 11, 2010
    Date of Patent: December 25, 2012
    Assignee: GM Global Technology Operations LLC
    Inventors: Milun Perisic, Silva Hiti, Gabriel Gallegos-Lopez
  • Patent number: 8339077
    Abstract: Slow speed operation of a brushless DC (BLDC) motor is enhanced by gating off some of the PWM pulses in each commutation period. By doing so, longer PWM pulse widths may be used at PWM signal frequencies that are inaudible while still allowing desired slow speed operation of the BLDC motor. Centering the non-gated PWM pulses in each commutation period where peak back EMF occurs, further reduces losses and improves delivery of maximum torque from the BLDC motor.
    Type: Grant
    Filed: April 26, 2010
    Date of Patent: December 25, 2012
    Assignee: Microchip Technology Incorporated
    Inventor: Ward R. Brown
  • Patent number: 8314581
    Abstract: A control system and method for a multi-phase motor substantially reduces or eliminates jitter resulting from drive mismatch by replacing a conventional trapezoidal drive profile with a drive profile that causes the voltage applied across active phases of the motor to match the back-EMF across those phases. In an ideal motor, the back-EMF is substantially sinusoidal, and although the drive profile applied to each phase is not truly substantially sinusoidal, the drive voltage across the active phases is substantially sinusoidal. In a non-ideal motor, the back-EMF is not truly sinusoidal and the drive profiles applied to each phase are calculated to cause the drive voltage across the active phases to match the back-EMF across those phases.
    Type: Grant
    Filed: December 10, 2010
    Date of Patent: November 20, 2012
    Assignee: Marvell International Ltd.
    Inventors: Ravishanker Krishnamoorthy, Foo Leng Leong
  • Patent number: 8278860
    Abstract: Zero-crossing detection accuracy is enhanced in a sensorless brushless direct current (BLDC) motor by increasing the PWM drive frequency in anticipation of a zero-crossing event in any one or more commutation periods. Once a zero-crossing event is detected, the PWM frequency can go back to a lower normal operating frequency. Switching losses of the power drive transistors are thereby minimized while maintaining accurate zero-crossing detection for stable operation of the BLDC motor.
    Type: Grant
    Filed: April 26, 2010
    Date of Patent: October 2, 2012
    Assignee: Microchip Technology Incorporated
    Inventor: Ward R. Brown
  • Patent number: 8254430
    Abstract: A method and apparatus for enabling the operative association of electronic devices that each employ spread spectrum EMI noise reduction. The method includes the detection of frequency modulation and the generation of a modulation detection signal that conveys the modulation extent and type. The modulation detection signal is then used to accommodate the modulation technique and make it compatible with the receiving electronic device. The apparatus of the invention includes an FM modulator that creates an FM signal from an input signal, an FM detector that detects the FM content of the incoming signal and represent this information by means of either voltage or current signals, and a circuit to process this FM information and perform functions such as modification of the FM content and generating a new signal with this new content, complete removal of the content, and “no-action,” whereby the signal is passed on with no alteration to the content.
    Type: Grant
    Filed: September 10, 2001
    Date of Patent: August 28, 2012
    Inventor: Narendar Venugopal
  • Patent number: 8120306
    Abstract: Methods and apparatus are provided for operation of a voltage source inverter. A method of operating a voltage source inverter having an output with multiple voltage phases having a DC voltage level, the method comprising sensing a low output frequency condition; determining a DC voltage offset responsive to the low output frequency condition; and applying the DC voltage offset when operating the voltage source inverter resulting in a change to the DC voltage level of the multiple voltage phases.
    Type: Grant
    Filed: January 5, 2009
    Date of Patent: February 21, 2012
    Assignee: GM Global Technology Operations LLC
    Inventors: Sibaprasad Chakrabarti, Rajkumar Copparapu
  • Patent number: 8072171
    Abstract: A method of controlling a current of a three-phase electric motor with a three-phase controller. The firing angles are adjusted so as to leave a range of firing angles in which DC components appear.
    Type: Grant
    Filed: April 17, 2007
    Date of Patent: December 6, 2011
    Assignee: ABB AB
    Inventors: Daniel Kling, Gunnar Johansson
  • Patent number: 8054019
    Abstract: The invention concerns a method and an apparatus for controlling a three-or-more-phase motor driven by a frequency converter. In the method, a change-over switch of the frequency converter is controlled to a continuously conducting state and at the same time the phase voltages or phase currents of the other phases are controlled by switching the change-over switches in those motor phases at a switching frequency substantially higher than the frequency of the fundamental wave of the phase voltage or phase current. The apparatus comprises in conjunction with the frequency converter a number of change-over switches, at least one change-over switch for each motor phase. The change-over switches comprise controllable change-over contacts. The apparatus further comprises in conjunction with the frequency converter means for determining the motor phase currents and means for controlling the change-over contacts.
    Type: Grant
    Filed: June 22, 2009
    Date of Patent: November 8, 2011
    Assignee: Kone Corporation
    Inventors: Antti Kallioniemi, Lauri Stolt, Tuukka Kauppinen
  • Patent number: 7973502
    Abstract: A drive unit includes a rotating electrical machine; a rotation sensor that detects a rotational position of a rotor of the rotating electrical machine, and a storage medium. In an inspecting step of measuring a counter electromotive force by mechanically driving the rotating electrical machine after the rotating electrical machine and the rotation sensor are assembled together, positional error information of the rotation sensor obtained based on information of the counter electromotive force and output information from the rotation sensor is stored in the storage medium. The storage medium is integrally provided to the drive unit in such a state that the storage medium is readable upon assembling a control device that controls the rotating electrical machine.
    Type: Grant
    Filed: December 30, 2008
    Date of Patent: July 5, 2011
    Assignee: Aisin Aw Co., Ltd.
    Inventors: Yoshinari Nakagawa, Tomoo Atarashi, Takafumi Koshida
  • Patent number: 7952318
    Abstract: A system and method for determining stator winding resistance in an AC motor is disclosed. The system includes a circuit having an input connectable to an AC source and an output connectable to an input terminal of an AC motor. The circuit includes at least one contactor and at least one switch to control current flow and terminal voltages in the AC motor. The system also includes a controller connected to the circuit and configured to modify a switching time of the at least one switch to create a DC component in an output of the system corresponding to an input to the AC motor and determine a stator winding resistance of the AC motor based on the injected DC component of the voltage and current.
    Type: Grant
    Filed: June 3, 2008
    Date of Patent: May 31, 2011
    Assignee: Eaton Corporation
    Inventors: Bin Lu, Thomas G. Habetler, Pinjia Zhang, Peter J. Theisen
  • Patent number: 7782005
    Abstract: In a power converter including an inverter configured to convert a direct current voltage into an alternating current voltage by controlling switching devices to be turned ON or OFF based on a control signal and to output the alternating current voltage to a load, a carrier wave frequency is changed. A command value is compensated in accordance with the changing carrier wave frequency. The control signal results from a comparison of the carrier wave with a compensated command value. As a result of the compensation, output fluctuations caused by an error voltage between the command value and an output voltage to the load can be suppressed.
    Type: Grant
    Filed: September 26, 2007
    Date of Patent: August 24, 2010
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Kentaro Shin, Kraison Throngnumchai, Yasuaki Hayami, Toshihiro Kai
  • Patent number: 7778529
    Abstract: A method is proposed for supplying electrical power to a DC motor (16) which can be commutated electronically via a semiconductor power output stage (28), preferably a three-phase DC motor, through which a control unit (22) passes current in blocks, corresponding to the signals from a rotor position sensor (20). Current is passed through the motor (16) variably in steps, in such a manner that the magnitude and/or the duration and/or the trigger angle of the current blocks can be varied as a function of the rotation speed and/or of the load, with respect to the profile of the induced voltage (E).
    Type: Grant
    Filed: September 7, 2006
    Date of Patent: August 17, 2010
    Assignee: Robert Bosch GmbH
    Inventor: Torsten Wilharm
  • Patent number: 7659683
    Abstract: Systems and methods that determine resonant frequencies of a motor system via employing an output of a velocity regulator. The velocity regulator enables the motor drive to command the rotation of the motor at predetermined rotations, by setting rotational speeds of the motor. The output of the velocity regulator can then be stored as a function of time, and a Fast Fourier Transform performed on such time data to obtain a frequency data and a signal power spectrum.
    Type: Grant
    Filed: January 30, 2007
    Date of Patent: February 9, 2010
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Zhengrong Li, Wei Qian, Peter B. Schmidt, Sang Hoon Lee
  • Publication number: 20100019986
    Abstract: Method for obtaining a predetermined position for a satellite antenna, whereby a controller (9) is made to transfer information to a velocity controller (3), in turn being made to transfer information to a current regulator (4), being made to transfer current to a motor which is intended for setting the desired position of the satellite antenna. The electrical motor (5) is made to receive current from the current regulator so that the electrical motor is made to turn a predetermined angle during a predetermined time interval. An angle sensor (6) is positioned on the satellite antenna and is made to read an absolute angle or an angular displacement of the satellite antenna, and the angle sensor is connected to the controller so as to create a feedback loop. An automatic control system is also disclosed.
    Type: Application
    Filed: December 14, 2007
    Publication date: January 28, 2010
    Applicant: C2SAT COMMUNICATIONS AB
    Inventor: Erik Dalin
  • Patent number: 7545113
    Abstract: Presented is a harmonic regulator that regulates a plurality of individual harmonics in a system having periodic torque disturbances to commanded values, including zero. For each harmonic being regulated, a feedback signal having at least one harmonic component due to the harmonic being regulated is transformed from a source reference frame to a harmonic reference frame of the harmonic being regulated to form a qd feedback signal. The qd feedback signal is subtracted from the commanded value to form a qd signal and regulated. The regulated qd signal is transformed to a destination reference frame to form a compensation signal and the compensation signal is added to a control signal to form a qd control signal that drives each harmonic being regulated towards the commanded value.
    Type: Grant
    Filed: October 24, 2006
    Date of Patent: June 9, 2009
    Assignee: Unico, Inc.
    Inventors: Mark E. Garlow, William S. Hammel, David R. Seidl
  • Patent number: 7429841
    Abstract: A method and circuit for detecting the position of the movable element of an electrically commutated machine. The method and apparatus allow detection of the back electromagnetic force (BEMF) waveform with all legs of the machine energized by mathematically removing the applied voltage from the measured voltage across the phases.
    Type: Grant
    Filed: September 30, 2004
    Date of Patent: September 30, 2008
    Assignee: The Berquist Torrington Company
    Inventors: Haroon I. Yunus, Russel H. Marvin, Bumsuk Won
  • Patent number: 7397215
    Abstract: The invention relates to methods and systems for modulating the supply voltage of an electric load, particularly an electric motor, fed by a bridge circuit, wherein the load is switched as a function of a predetermined setpoint value for the input current or the input power by means of power electronics to an intermediate circuit voltage. A modulation method is disclosed in which, instead of the winding current (or the winding currents in the case of multi-strand motors), the intermediate circuit current or the input power of the motor is used as the actual value for regulation. The switch-on times for the modulation of the motor voltage are predetermined at a set frequency by a controller, such as a microcontroller or a timer. The switch-off times are determined such that the average value of the intermediate circuit current corresponds to a predetermined setpoint value.
    Type: Grant
    Filed: April 5, 2006
    Date of Patent: July 8, 2008
    Assignee: Minebea Co., Ltd.
    Inventor: Andras Lelkes
  • Publication number: 20080100245
    Abstract: A DC motor phase estimation algorithm that estimates a speed-related harmonic frequency of a DC motor current under dynamic load conditions having known geometry parameters. The algorithm estimates the phase and magnitude of a complex coefficient in a complex single frequency adaptive filter that receives a primary signal from the motor current and estimates a reference signal using an incident frequency by adapting the complex coefficient to match the magnitude and phase of the speed-related harmonic component of the primary signal. The rate of change of the phase of the complex coefficient is determined by a phase-lock loop coupled to the adaptive filter to adapt a dynamic incident frequency corresponding to a single frequency component of interest in the primary signal. The incident frequency is extracted, and the motor speed is estimated using the extracted incident frequency and the known motor geometry parameters.
    Type: Application
    Filed: October 30, 2006
    Publication date: May 1, 2008
    Inventor: Larry A. Turner
  • Patent number: 7317293
    Abstract: Provided is a motor control circuit in which the circuit structure is not complicated, which has a favorable response to the phase difference signal, and in which the signal variation caused by heat is small. This rotation control circuit of a motor includes: a PWM control circuit of the motor; a rotational speed sensor of the motor; a reference signal generation circuit 10; a phase comparing circuit; and a divider for dividing the detected rotational speed signal of the motor; wherein the phase difference between the signal from the divider and the signal based on the reference signal is sought with the phase comparing unit, and this phase difference signal is supplied to the PWM control circuit.
    Type: Grant
    Filed: October 29, 2003
    Date of Patent: January 8, 2008
    Assignee: Seiko Epson Corporation
    Inventor: Kesatoshi Takeuchi
  • Patent number: 7315142
    Abstract: A method for a power optimal control of a BLDC motor by continuously updated commutation points and circuit assembly for a power optimal control of a BLDC motor. The method includes measuring a time difference (?T) between two immediately subsequent zero crossings (TN1, TN2) of first and second motor phases, and performing a commutation of an immediately next motor phase after substantially one-half of the time difference (?T/2) elapses after the zero crossing of the second motor phase (TN2). The commutation is performed for all phases in a continuous manner in accordance with a switching algorithm (Tcommutation=TN2+(?T/2)).
    Type: Grant
    Filed: February 24, 2004
    Date of Patent: January 1, 2008
    Assignee: Melexis GmbH
    Inventors: Harald Lindemann, Joergen Sturm
  • Patent number: 7308192
    Abstract: A drive system for a three phase brushless AC motor that is operative to optimize a transistor switching pattern to improve power output while allowing current measurement in all of the phases using a single sensor. This is achieved by defining a voltage demand vector where more than two states are required to meet a minimum state time requirement determined by the single sensor and calculating three or more state vectors that produce the demand vector while still allowing single current sensing.
    Type: Grant
    Filed: December 7, 2004
    Date of Patent: December 11, 2007
    Assignees: TRW Limited, TRW Automotive US, LLC
    Inventors: Connel Brett Williams, Jeffrey Ronald Coles, Adrian Szabo, Christopher David Dixon, Jiang Li, Abbas Ahmad Fardoun
  • Patent number: 7259533
    Abstract: Disclosed is a method of controlling drive speed of a motor operating in overload conditions. The method includes the steps of: driving the motor at a predetermined reference speed; detecting phase voltage and phase current applied to the motor; determining whether or not the motor is operating in overload conditions based on the detected phase voltage and phase current; and controlling the motor according to whether or not the motor is operating in overload conditions. Accordingly, the present invention can prevent occurrence of over-current due to the instantaneous acceleration of the motor to a predetermined initial speed.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: August 21, 2007
    Assignee: LG Electronics Inc.
    Inventors: Soon-bae Yang, Tae-kyung Kim, Sung-min Park, Tae-won Kim
  • Patent number: 7224138
    Abstract: Feedback control of a target system is provided which utilizes the imposition of a periodic modulating signal onto a command signal of a controller. The command signal with the period modulating signal imposed thereon is input to the target system to be controlled. A response of the target system to a manifestation of the periodic modulating signal in the command signal is detected, and a feedback signal is produced from the detected response. The periodic modulating signal and the feedback signal are processed together to produce an error signal, and the command signal is modified in accordance with the error signal to drive the current state of the target system toward a desired state, wherein the periodic modulating signal facilitates control of the target system.
    Type: Grant
    Filed: August 1, 2006
    Date of Patent: May 29, 2007
    Assignee: International Business Machines Corporation
    Inventors: Casimer M. DeCusatis, Timothy Matthew Trifilo, Lawrence Jacobowitz
  • Patent number: 7190143
    Abstract: A method for controlling a device including a plurality of switching devices operated in accordance with a pulse width modulation technique includes receiving a reference voltage signal associated with a first pair of the switching devices. A switching signal is generated. The first pair of switching devices are controlled based on the reference voltage signal and the switching signal in accordance with the pulse width modulation technique. A frequency of the switching signal is varied based on the value of the reference voltage signal.
    Type: Grant
    Filed: May 27, 2005
    Date of Patent: March 13, 2007
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Lixiang Wei, Richard A. Lukaszewski
  • Patent number: 7126306
    Abstract: Windings of each phase in a three-phase AC motor are independent of one another. A motor control unit gives, to windings of each phase (U, V and W-phase), currents (IU, IV, IW) obtained by adding, to a fundamental sine wave current, a current having a frequency which is three times as high as that of the fundamental sine wave current. That is, IU=I·sin ?t+Ia·sin 3?t: IV=I·sin(?t+2/3?)+Ia·sin 3?t: IW=I·sin(?t+4/3?)+Ia·sin 3?t Also, amplitude Ia of a current having a frequency which is three times as high as that of the fundamental sine wave current is set to a predetermined value smaller than amplitude I of the fundamental sine wave current.
    Type: Grant
    Filed: May 19, 2004
    Date of Patent: October 24, 2006
    Assignee: Fanuc Ltd
    Inventors: Keiji Sakamoto, Hisashi Maeda
  • Patent number: 7106021
    Abstract: Feedback control of a target system is provided which utilizes the imposition of a periodic modulating signal onto a command signal of a controller. The command signal with the period modulating signal imposed thereon is input to the target system to be controlled. A response of the target system to a manifestation of the periodic modulating signal in the command signal is detected, and a feedback signal is produced from the detected response. The periodic modulating signal and the feedback signal are processed together to produce an error signal, and the command signal is modified in accordance with the error signal to drive the current state of the target system toward a desired state, wherein the periodic modulating signal facilitates control of the target system.
    Type: Grant
    Filed: May 4, 2004
    Date of Patent: September 12, 2006
    Assignee: International Business Machines Corporation
    Inventors: Casimer M. DeCusatis, Timothy Matthew Trifilo, Lawrence Jacobowitz
  • Patent number: 7102326
    Abstract: A motor variator and a driving method thereof are provided for controlling the operating speed of a fan, which employ an alternate current chopper to change the working cycle and the rotary speed of a stepless motor. The motor variator includes a high-frequency alternate current chopper connected to an induction coil of an induction motor, an alternate current power supply connected to the high-frequency alternate current chopper and a controller connected to the high-frequency alternate current chopper for outputting a switch signal to the high-frequency alternate current chopper, such that the high-frequency alternate current chopper is controlled by the switch signal to perform a chopper action for the alternate current power supply and output a drive voltage, so as to change the rotary speed of the induction motor.
    Type: Grant
    Filed: August 8, 2005
    Date of Patent: September 5, 2006
    Assignee: Fego Precision Industrial Co., Ltd.
    Inventors: Yu-Kai Chen, Tsai-Fu Wu, Wen-Yang Wang, Yung-Chun Wu, Chin-Hsiung Chang
  • Patent number: 7084603
    Abstract: A motor control device that can reduce electrical noise is provided. A motor control device includes an inverter, a current controller, a high frequency wave superpositioner, and a high frequency wave setter. An inverter applies a current to the motor. A current controller outputs a voltage to the inverter according to a current applied to the motor from the inverter. A high frequency wave superpositioner applies a high frequency wave to the voltage from the current controller as a superpositioned wave to infer a position of a rotor in the motor. A high frequency wave setter varies at least one characteristic of the superpositioned wave applied by the high frequency wave superpositioner.
    Type: Grant
    Filed: May 13, 2004
    Date of Patent: August 1, 2006
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hitoshi Taguchi, Takeshi Kitahata, Yosuke Nakazawa