Phasing Or Angular Or Linear Positional Control Of Movable Element Of The Motor Patents (Class 318/437)
  • Patent number: 10673364
    Abstract: A motor control method includes acquiring three current values of three-phase currents flowing through a motor, the three current values being detected by three current sensors, and two rotor angles of the motor, the two rotor angles being detected by two position sensors; performing six ways of calculation using two of the three current values and one of the two rotor angles; identifying at least one failed sensor from among the current sensors as well as the position sensors, using a table showing a relationship between a failed sensor and a pattern of a result of each of the six ways of calculation; selecting, as a normal sensor, a sensor different from the at least one failed sensor identified; and controlling the motor using the normal sensor selected.
    Type: Grant
    Filed: July 28, 2017
    Date of Patent: June 2, 2020
    Assignee: NIDEC CORPORATION
    Inventor: Ahmad Ghaderi
  • Patent number: 10637377
    Abstract: A motor driving device includes: brushless DC motor (5) that drives a load that fluctuates during one rotation; and driver (9) that applies a voltage to brushless DC motor (5) and drives brushless DC motor (5). The motor driving device further includes speed accelerator (8) that determines the voltage to be applied by driver (9) so as to accelerate brushless DC motor (5) such that a speed change rate of a speed within one rotation from start of brushless DC motor (5) with respect to a speed at next one rotation remains within a predetermined value or less.
    Type: Grant
    Filed: February 15, 2018
    Date of Patent: April 28, 2020
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yoshinori Takeoka, Hidehisa Tanaka
  • Patent number: 10608568
    Abstract: In a control device for an AC rotary machine, having an angle detector for detecting an electrical angle of the AC rotary machine, a detection error produced by the angle detector due to a noise magnetic field generated by a multi-phase alternating current flowing through an inverter connection unit is corrected using a correction signal having a phase and an amplitude that are determined in accordance with a relative positional relationship between the inverter connection unit and the angle detector and a current vector of the multi-phase alternating current, whereupon an inverter is controlled on the basis of the corrected electrical angle. As a result, a simple, low-cost control device for an AC rotary machine with which an angular position of a rotor can be detected with a high degree of precision is obtained.
    Type: Grant
    Filed: January 23, 2015
    Date of Patent: March 31, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventor: Akira Furukawa
  • Patent number: 10601348
    Abstract: A switching module switches between receiving a first output from a sensor and a second output from a sensor-less position detection module each indicating a rotor position error of a motor. A position determining module determines a rotor position of the motor based on an output of the switching module and generates a control signal to control a parameter of the motor. A sample and hold module operates on a sum of the output of the switching module and an output of the sample and hold module from a prior instance of switching between the first and second outputs. The position determining module scales the output of the sample and hold module using first and second gains to generate first and second scaled outputs, and generates the control signal based on the output of the switching module and the first and second scaled outputs.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: March 24, 2020
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: David S. Ochs, Anno Yoo, Kibok Lee
  • Patent number: 10495519
    Abstract: Estimating junction temperature in a power semiconductor includes monitoring electrical current direction so as to determine which of a first and a second power semiconductor is in an on-state, and sensing a voltage drop across the one of the power semiconductors. Voltage drop may be correlated with temperature according to a gain dependent upon a level of the electrical current.
    Type: Grant
    Filed: June 22, 2016
    Date of Patent: December 3, 2019
    Assignee: ABB Schweiz AG
    Inventors: Jukka-Pekka Sjoroos, Kari Tikkanen
  • Patent number: 10454331
    Abstract: An electric machine has a multiplicity of windings having a first terminal and a second terminal. At least one node exists to which one of the two terminals of a respective winding from the multiplicity of windings is electrically connected. The corresponding other terminal of a respective winding from the multiplicity of windings is electrically connected to a phase terminal, and to a modular multilevel converter that has a multiplicity of individual modules that are connected up in series to form a ring. At least one tap can be arranged between two respective adjacent individual modules and provides a phase terminal to which the first or the second terminal of a winding from the multiplicity of windings of the electric machine is electrically connected. A number of taps of the modular multilevel converter corresponds exactly to a number of windings from the multiplicity of windings of the electric machine.
    Type: Grant
    Filed: December 5, 2016
    Date of Patent: October 22, 2019
    Assignee: Dr. Ing. h.c. F. Porsche Aktiengesellschaft
    Inventor: Stefan Götz
  • Patent number: 10396691
    Abstract: A motor control circuit system is arranged to control the activation of a motor when the input voltage of the motor equals to a predetermined threshold so as to save the power consumption of the motor, wherein no current is allowed to pass to the motor before the input voltage of the motor reaches again the predetermined threshold. Therefore, the motor is electrified in an intermittent manner, such that the driven mechanism runs with its inertia even though the motor is idling, i.e. no current passing to the motor, so as to save the energy consumption of the motor.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: August 27, 2019
    Inventor: Der-San Chen
  • Patent number: 10284128
    Abstract: A motor includes a stator comprising windings configured to be energized, and a rotor electromagnetically coupled to the stator and configured to turn relative thereto when the stator is energized. The motor also includes a motor controller configured to measure a speed at which the rotor turns, and energize said stator to generate a first torque output at the rotor when the measured speed is below a first threshold. The motor controller is also configured to energize the stator to generate a second torque output at the rotor when the measured speed is at least the first threshold, wherein the second torque output is greater than the first torque output.
    Type: Grant
    Filed: June 20, 2017
    Date of Patent: May 7, 2019
    Assignee: Regal Beloit America, Inc.
    Inventors: Andrew Craig Barry, Brian Lee Beifus, Lester Benjamin Manz, Kamron Mark Wright
  • Patent number: 10084398
    Abstract: A method for adjusting a drive control signal for a motor includes providing a drive circuit having a first pin and a second pin, wherein the drive circuit generates the drive signal. A period of the drive signal is determined and an advance angle count value is extracted from a storage register in accordance with the period of the drive signal. One of the advance angle count value and a first control signal coupled to the first input pin are used to determine an advance angle adjustment range or an advance angle count range and a second control signal received via the second input pin are used to determine an advance angle adjustment range. The drive control signal is adjusted in response to the advance angle adjustment range.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: September 25, 2018
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventor: Takashi Ogawa
  • Patent number: 9941824
    Abstract: An electric working machine according to one aspect of the present disclosure comprises a brushless motor, a rotational position sensor, a detector, and a calculator. The calculator detects, when the brushless motor is inertially rotated, a difference between a detection result obtained by the rotational position sensor and a detection result obtained by the detector and calculates a correction value, based on the difference, for correcting the detection result obtained by the rotational position sensor.
    Type: Grant
    Filed: January 24, 2017
    Date of Patent: April 10, 2018
    Assignee: MAKITA CORPORATION
    Inventor: Hitoshi Suzuki
  • Patent number: 9673734
    Abstract: An apparatus for delay angle compensation for flying start function in a medium-voltage inverter is disclosed. The apparatus generates generate a phase angle (?) by converting a three-phase voltage of an inverter output terminal to dq-axis voltages (Vd, Vq), and calculate a compensation phase angle by a predetermined delay time. In addition, the apparatus generates an initial angle for the flying start by aggregating the compensation phase angle with the phase angle (?). The apparatus may drive a high-voltage motor more stably, because an error between a command voltage phase angle and an actual output voltage phase angle may be reduced, when electric power of the medium voltage inverter is restored after a trip or an instantaneous blackout occurs.
    Type: Grant
    Filed: June 12, 2015
    Date of Patent: June 6, 2017
    Assignee: LSIS CO., LTD.
    Inventors: Sung Guk Ahn, Seung Cheol Choi
  • Patent number: 9601003
    Abstract: A system for detecting sensor failure and/or operating with a failed sensor in an electrical machine includes an electrical machine, three or more sensors configured to connect to the electrical machine, and a sensor module operatively connected to each sensor to receive sensor signals from the sensors. The sensor module includes a failure detection module operatively connected to each sensor and configured to determine if each sensor is a failed sensor or a functioning sensor. The sensor module also includes a virtual sensor module operatively connected to the failure detection module and configured to output simulated sensor signals for the failed sensor, wherein the sensor module is configured to output the sensor signals for each functioning sensor. The system includes a control module operatively connected to the sensor module and the electrical machine to receive sensor signals and simulated sensor signals to control operation of the electrical machine.
    Type: Grant
    Filed: August 17, 2015
    Date of Patent: March 21, 2017
    Assignee: Hamilton Sundstrand Space Systems International, Inc.
    Inventors: Robert P. Wichowski, Patrick J. Sears, Kevin G. Hawes
  • Patent number: 9584050
    Abstract: A motor drive device of the present invention includes a speed signal generator that generates a rotation speed signal indicating rotation speed; a PWM signal generator that acts on the power switch unit to control the power switch unit so as to generate coil-applied voltage; and a phase advance information generator that has characteristic curve information representing changes of rotation speed of and load on a brushless motor, preliminarily set. The phase advance information generator generates phase advance information according to the load characteristic curve to variably control the phase advance (the phase of voltage applied to the coils of the brushless motor, relative to the induced voltage phase) according to the load characteristic curve.
    Type: Grant
    Filed: December 10, 2013
    Date of Patent: February 28, 2017
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Toshiki Tubouchi, Tomoya Hosokawa, Yasushi Kato
  • Patent number: 9473044
    Abstract: A power inverter includes a DC/AC inverter having first, second and third phase circuitry coupled to receive power from a power source. A controller is coupled to a driver for each of the first, second and third phase circuitry (control input drivers). The controller includes an associated memory storing a phase skipping control algorithm, wherein the controller is coupled to receive updating information including a power level generated by the power source. The drivers are coupled to control inputs of the first, second and third phase circuitry, where the drivers are configured for receiving phase skipping control signals from the controller and outputting mode selection signals configured to dynamically select an operating mode for the DC/AC inverter from a Normal Control operation and a Phase Skipping Control operation which have different power injection patterns through the first, second and third phase circuitry depending upon the power level.
    Type: Grant
    Filed: May 7, 2014
    Date of Patent: October 18, 2016
    Assignee: University of Central Research Foundation, Inc.
    Inventors: Utsav Somani, Ahmadreza Amirahmadi, Charles Jourdan, Issa Batarseh
  • Patent number: 9438156
    Abstract: This motor control device generates a voltage command value from a current command value and performs feedback control by means of a detected current flowing through a motor. The motor control device is provided with: a correction control unit that, when the motor is being rotated at a set speed, sets a d-axis current command value and a q-axis current command value to each be zero; a current control unit that generates the integrated value of the deviation between the current command value and the detected current; and an integrated value measurement unit that measures the generated integrated value. The correction control unit adjusts the correction value for the rotational position of the motor by adjusting in a manner so that the measured integrated value becomes a value within a pre-determined range.
    Type: Grant
    Filed: October 1, 2012
    Date of Patent: September 6, 2016
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventor: Yoshiki Kato
  • Patent number: 9343102
    Abstract: A data storage device is disclosed comprising a disk, a spindle motor configured to rotate the disk, wherein the spindle motor comprises a plurality of windings, and a head actuated over the disk. The windings are commutated based on a commutation sequence while applying a periodic driving voltage to each winding, wherein the periodic driving voltage comprises an operating amplitude during normal operation. When a supply voltage falls below a threshold, the spindle motor is configured into a power generator by at least adjusting a phase of the periodic driving voltage by a phase offset and adjusting the amplitude of the periodic driving voltage based on the phase offset.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: May 17, 2016
    Assignee: Western Digital Technologies, Inc.
    Inventors: Michael Troy Nicholls, Joseph J. Crowfoot
  • Patent number: 9325262
    Abstract: A motor system includes a motor including two linear Hall sensors configured to output analog signals, and a controller configured to control the motor. The controller is operable to monitor the analog signals output from the two linear Hall sensors, determine a plurality of auxiliary signals based on the analog signals, and determine a motor position based on the plurality of auxiliary signals.
    Type: Grant
    Filed: April 9, 2014
    Date of Patent: April 26, 2016
    Assignee: Woodward, Inc.
    Inventors: Raymond Liu, Estella Chung, Joon H. Lee
  • Patent number: 8983727
    Abstract: A steering control apparatus is obtained which can achieve a sophisticated control function and redundancy of a motor output torque control unit with a simple construction. The apparatus includes a motor 3 that provides assist torque to a steering system, and a processing unit 2 that has an input processing section 21 for taking in detection signals of various kinds of sensors, and an inverter 25a for driving the motor 3, wherein a command is given to the inverter 25a based on the detection signals. The processing unit 2 has a motor target output torque calculation section 221a, a motor output torque control unit 222, a plurality of main-calculation sections, and a plurality of sub-calculation sections corresponding to the main-calculation sections, and determines abnormality of the motor output torque control unit 222 based on individual calculation results of the main-calculation sections and the sub-calculation sections.
    Type: Grant
    Filed: May 30, 2006
    Date of Patent: March 17, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takayuki Kifuku, Hiroyuki Kozuki, Masaki Matsushita
  • Patent number: 8963475
    Abstract: A micro-step driving control apparatus for a stepping motor in which torque fluctuations caused by influence of detent torque can be reduced without performing preliminary driving, including: a phase difference estimator calculating, based on detected motor current and a command value, an estimated phase difference between the command value and the current; low-speed and high-speed motor rotational angle estimators calculating an estimated motor rotational angle at a low speed rotation and an estimated motor rotational angle at a high speed rotation; an addition unit calculating, based on the command value, an estimated motor rotational angle by mixing the estimated motor rotational angles at an appropriate rate; a detent torque estimator calculating, based on the mixed estimated motor rotational angle, estimated detent torque; and a compensation signal generator generating a compensation signal based on the estimated detent torque and the mixed estimated motor rotational angle.
    Type: Grant
    Filed: October 3, 2011
    Date of Patent: February 24, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventor: Munetaka Kashiwa
  • Patent number: 8933653
    Abstract: A motor current detection apparatus in the present invention includes: a current detection unit, a first filter, and a second filter. The detection unit detects a conduction current flowing from a battery to a brushless motor and outputs a conduction current signal corresponding to the detected conduction current. The first filter extracts a first current signal which is included in the conduction current signal outputted from the detection unit and is a signal component in a frequency band equal to or lower than a predetermined first cutoff frequency. The second filter extracts a second current signal which is included in the conduction current signal outputted from the detection unit and is a signal component in a predetermined frequency band within a frequency band equal to or lower than a predetermined second cutoff frequency higher than the first cutoff frequency and having the second cutoff frequency as a maximum value.
    Type: Grant
    Filed: October 2, 2012
    Date of Patent: January 13, 2015
    Assignee: Makita Corporation
    Inventors: Yoshitaka Ichikawa, Motohiro Omura, Kenya Yanagihara
  • Publication number: 20140346994
    Abstract: A phase gating controller includes a thyristor/triac having a control terminal and two power terminals, a sampling device for sampling a voltage present across the power terminals of the thyristor/triac and a control device configured to provide a control voltage at the control terminal in order to trigger the thyristor/triac. The control device is further configured to switch off the control voltage at the triggered thyristor and to detect an unexpected turning-off of the thyristor/triac if the sampled voltage exceeds a predetermined threshold value.
    Type: Application
    Filed: May 22, 2014
    Publication date: November 27, 2014
    Applicant: Robert Bosch GmbH
    Inventors: Kamil Pogorzelski, Jacek Wiszniewski
  • Patent number: 8897954
    Abstract: A method is provided of calibrating a position sensor of an electric motor of a vehicle.
    Type: Grant
    Filed: May 5, 2011
    Date of Patent: November 25, 2014
    Assignee: Deere & Company
    Inventors: Eric R. Anderson, Zimin Wu Vilar
  • Patent number: 8847533
    Abstract: There is provided an actuator in which an worm is rotationally driven by an electric motor, and in which an angular velocity of the electric motor is repeatedly fluctuated so that the rotation of the worm is carried out as if the worm is oscillated in the rotational direction thereof, to thereby decrease contact friction of the worm against a worm wheel, resulting in an improvement of an efficiency of force transmission of the worm gear mechanism.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: September 30, 2014
    Assignee: Seibu Electric & Machinery Co., Ltd.
    Inventors: Masakazu Mori, Daisuke Kukita, Seiya Shimada
  • Patent number: 8823301
    Abstract: A device and method to determine the stopping rotor position of a washing machine motor includes an inverter, a permanent magnet synchronous motor, and an electronic motor controller. The controller determines the stopped rotor position of the motor by measuring induced currents in the stator field coils of the motor. While the motor is de-energized and slowly rotating, the controller directs the inverter to connect all of the stator field coils of the motor together. The stator field coils may be connected to a common D.C. rail, output from an A.C.-D.C. converter of the washing machine. In an embodiment, the controller determines the rotor position based on the polarities of current induced in the stator field coils. In another embodiment, the controller determines the rotor position based on the phase angle and angular frequency of the three phase currents, transformed into a stationary reference frame.
    Type: Grant
    Filed: November 5, 2012
    Date of Patent: September 2, 2014
    Assignee: Whirlpool Corporation
    Inventors: Biao He, Qiang Mei
  • Patent number: 8810173
    Abstract: Continuous monitoring and fault diagnosis of rotating machinery during variable speed operation is performed using only a position feedback signal. The position sensor generates a periodic waveform having multiple pulses per revolution of the machine. A circuit is included to detect, for example, a zero crossing or edge of the periodic waveform. At each detected zero crossing or edge, the time and position of the event is stored in memory. Other data, such as the current in the motor, may also be sampled and stored in memory. Because the sampled data is triggered by repeated feature of the position feedback signal, the sampled data is in a stationary reference frame in the position domain. Frequency analysis is performed on the sampled data, and the frequency components present in either the sampled signal are analyzed to identify the presence of a fault in the rotating machinery.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: August 19, 2014
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Linglai Li, Wei Qian, Thomas D. Lundell
  • Patent number: 8796979
    Abstract: Disclosed is an apparatus for driving a BLDC motor, the apparatus including: a BLDC motor having a single sensing coil therein; a position/speed calculation unit for calculating a current position and a current speed of a rotor by using voltages at both ends of the sensing coil; a control unit for comparing the current speed of the rotor calculated by the position/speed calculation unit with a command speed and then outputting a control signal through a Proportional Integral (PI) control; a motor driving unit for generating a PWM signal based on the current position of the rotor calculated by the position/speed calculation unit and the control signal output by the control unit; and a power device unit for controlling the BLDC motor according to the PWM signal generated by the motor driving unit.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: August 5, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventor: Jimin Oh
  • Patent number: 8796962
    Abstract: A drive unit, which can be included in an image forming apparatus with peripherals disposed thereto and use a control method therefore, includes an inner rotor brushless DC motor, a driver, a rotation detector, and a controller. The driver supplies power to drive the brushless DC motor. The rotation detector detects an amount and direction of rotations of an output shaft. The controller controls the rotations of the brushless DC motor and obtains a target drive signal of the brushless DC motor externally and a detection signal from the rotation detector and outputs a signal to the driver. The controller controls a speed of rotation of the brushless DC motor by varying the signal output to the driver based on the target drive signal and the detection signal.
    Type: Grant
    Filed: July 8, 2011
    Date of Patent: August 5, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Takuya Murata, Shogo Sakamoto, Kenji Tomita
  • Patent number: 8749186
    Abstract: The invention relates to a circuit arrangement for operating an electric motor, in particular an electric motor for a windshield wiper. The electric motor has a first voltage connection, a ground connection, and a return connection. The ground connection is connected to a battery ground connection of a battery. Furthermore, a switch is provided, which is designed to open or disconnect a conductive connection between the ground connection and the return connection depending on an angle position of a shaft driven by the electric motor. Additionally, a filter member is arranged between the return connection and the ground connection.
    Type: Grant
    Filed: August 6, 2010
    Date of Patent: June 10, 2014
    Assignee: Robert Bosch GmbH
    Inventors: Armin Stubner, Norbert Martin
  • Patent number: 8736211
    Abstract: Provided is a motor control device which realizes automatic adjustment of control of a motor for driving a mechanical load through a simple operation. The motor control device includes: a follow-up control unit (6) for receiving detection information of a detector (3) to output a torque command signal and output a status of motor control of a motor (1) as a control status amount signal, when a command signal regarding the motor control to be output from an upper-level controller is absent; an oscillation detection unit (9) for receiving the control status amount signal and detecting oscillation of a control status amount to output an oscillation detection signal; and an automatic adjustment unit (10) for receiving the oscillation detection signal to monitor a control status of the motor (1) and adjust a control parameter of the follow-up control unit (6) only when abnormality is detected.
    Type: Grant
    Filed: March 8, 2010
    Date of Patent: May 27, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Akira Tanabe, Yoshihiro Marushita, Hidetoshi Ikeda, Kei Terada, Tetsuya Tanabe, Masahiko Yoshida, Masanori Ozaki
  • Patent number: 8729843
    Abstract: To suppress torque variation including various frequency components, a lot of measuring and adjusting operations are necessary, and this takes much time and trouble. An electronic apparatus includes a selection unit configured to select, on the basis of a threshold value relating to speed variation of the mechanism and threshold values relating to a plurality of frequencies that constitute the speed variation, a frequency to be measured and a frequency to be suppressed, from the plurality of frequencies, a generation unit configured to generate a periodic signal including the frequency to be suppressed that is selected by the selection unit, and an acquisition unit configured to output the periodic signal generated by the generation unit to the control unit and to acquire a parameter relating to the frequency included in the periodic signal.
    Type: Grant
    Filed: March 16, 2010
    Date of Patent: May 20, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yasuhiro Iwadate
  • Patent number: 8704467
    Abstract: An inverter device provided on a washing machine for controlling a permanent magnet motor being provided with a rotor magnet including a first permanent magnet and a second permanent magnet having a level of coercivity smaller than the first permanent magnet. An excitation current is produced to vary the amount of magnetism of the second permanent magnet to execute a dehydrate operation with a magnetic flux of the rotor magnet reduced and to execute an operation being specified to operate at a lower maximum rotation count compared to the dehydrate operation with the magnetic flux of the rotor magnet increased. When the amount of magnetism of the second permanent magnet is varied while rotation of the permanent magnet motor is stopped, a phase of the excitation current for varying the amount of magnetism is switched depending on a rotation stop position of the rotor.
    Type: Grant
    Filed: November 4, 2008
    Date of Patent: April 22, 2014
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Consumer Electronics Holdings Corporation, Toshiba Home Appliances
    Inventors: Tsuyoshi Hosoito, Isamu Nitta
  • Patent number: 8692492
    Abstract: A method for setting a lead-angle value of a motor drive control circuit is disclosed. The motor drive control circuit energizes and drives the windings of a motor with an energizing timing based on a stored lead-angle value. The method includes the steps of: rotating a rotor at a given rpm (step S102), energizing and driving the windings during the rotation at the given rpm with the lead-angle value being switched (step S110); calculating an average value of current amount that energizes and drives the windings (step S114); calculating a total value of consecutive multiple average values for each lead-angle value (step S120); finding a smallest total value among the total values, and setting a lead-angle value corresponding to the smallest total value as a stored lead-angle value (step S122).
    Type: Grant
    Filed: February 29, 2012
    Date of Patent: April 8, 2014
    Assignee: Panasonic Corporation
    Inventor: Daisuke Sato
  • Patent number: 8680794
    Abstract: A small-sized load drive system which, even with three three-phase inverters, significantly reduces noise regardless of control duty ratio. The load drive system includes three-phase inverters, and first, second, and third control units. The inverters are connected to loads, respectively. The first control unit generates sawtooth wave voltage and controls the inverter according to the sawtooth wave voltage. The second control unit generates inverse sawtooth wave voltage and controls the inverter according to the inverse sawtooth wave voltage. The third control unit generates triangular wave voltage which has ramps respectively equal to the sawtooth/inverse sawtooth wave voltage and either has a same phase or is out of phase by half a period relative to the sawtooth/inverse sawtooth wave voltage, and also controls the inverter according to the triangular wave voltage.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: March 25, 2014
    Assignee: Panasonic Corporation
    Inventors: Shun Kazama, Makoto Kitabatake, Masaki Tagome
  • Patent number: 8674633
    Abstract: A method and device for controlling the starting time of a vehicle mounted thermal engine coupled mechanically to a polyphase rotary electrical machine with an inductor. The electrical machine includes phase windings and sensors for the position of a rotor, and is connected to an on-board electrical network. The method uses pre-fluxing by establishing an excitation current in the inductor for a predetermined pre-fluxing time, before establishment of phase currents. These phase currents are controlled by signals phase-shifted by an angle which varies according to a speed of rotation of the electrical machine, relative to synchronization signals produced by the sensors. During the starting time, the angle of phase-shifting is additionally dependent on a voltage of the on-board electrical network, in a range contained between a first and second voltages, with the second voltage being higher than the first. In the method, the starting time is independent from the voltage of the on-board electrical network.
    Type: Grant
    Filed: July 9, 2009
    Date of Patent: March 18, 2014
    Assignee: Valeo Equipements Electriques Moteur
    Inventor: Oussama Rouis
  • Patent number: 8643319
    Abstract: A method of controlling a brushless motor that includes rectifying an alternating voltage to provide a rectified voltage, and exciting a winding of the motor with the rectified voltage. The winding is excited in advance of predetermined rotor positions by an advance period and is excited for a conduction period over each electrical half-cycle of the motor. The length the advance period and/or the conduction period is defined by a waveform that varies periodically with time. The method then includes adjusting the phase of the waveform relative to the alternating voltage in response to a change in one of motor speed and RMS value of the alternating voltage. Additionally, a control system that implements the method, and a motor system that incorporates the control system.
    Type: Grant
    Filed: April 7, 2011
    Date of Patent: February 4, 2014
    Assignee: Dyson Technology Limited
    Inventor: Tuncay Celik
  • Patent number: 8618756
    Abstract: A method for controlling a permanent magnet synchronous motor is disclosed. The method comprises receiving a feedback current from a motor; generating a digital current signal based on the feedback current, the digital current signal indicative of a value of the feedback current; generating a power signal and a first imaginary power signal based on the digital current signal and a three-phase voltage signal; receiving a speed signal indicative of an expected speed of the motor; generating a phase signal based on the speed signal and the power signal; generating a voltage signal based on the speed signal, the power signal, and the first imaginary power signal; and adjusting the three-phase voltage signal for driving the motor based on the voltage signal and the phase signal.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: December 31, 2013
    Assignee: Industrial Technology Research Institute
    Inventors: Tsai-Wang Hung, Hsin-Ming Su
  • Patent number: 8610391
    Abstract: A disk drive is disclosed comprising a head actuated over a disk, and a spindle motor for rotating the disk, the spindle motor comprising a plurality of windings. During a spin-up operation a sinusoidal driving voltage is applied to each winding of the spindle motor. A back electromotive force (BEMF) voltage generated by at least one of the windings is measured, and a rotation speed of the spindle motor is measured. The sinusoidal driving voltage is adjusted in order to optimize a lead angle relative to the rotation speed, wherein the lead angle represents a degree the sinusoidal driving voltage leads the BEMF voltage.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: December 17, 2013
    Assignee: Western Digital Technologies, Inc.
    Inventors: Wenli Yang, Philip Tin Yue Ng, Ashok K. Desai, Robert P. Ryan
  • Patent number: 8598825
    Abstract: According to an embodiment, a lead angle control circuit is configured to control a lead angle of a motor drive signal driving a motor. The lead angle control circuit includes a control signal generating section, an upper limit voltage limit section and a lead angle data generating section. The lead angle data generating section is configured to generate a relationship line between lead angle data representing the lead angle and a lead angle control signal, and configured to generate the lead angle data based on the relationship line and the lead angle control signal. The relationship line reaches an upper limit point from a lower limit point through a changing point. In the changing point, the lead angle control signal is a changing point voltage, and the lead angle data represents the lead angle corresponding to a lead angle setting voltage.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: December 3, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Shen Wang, Takehiro Hara
  • Patent number: 8587247
    Abstract: A synchronous control apparatus to synchronously control a plurality of motors with respect to a control subject includes a command device and a plurality of motor control devices. The control subject includes the motors, a plurality of position detectors configured to detect a plurality of position information of the motors respectively, and at least one coupler connecting movable axes of the motors. The command device includes a first position controller which is configured to compute a work position based on the position information detected by the position detectors and which is configured to compute, based on a difference between a position command and the work position, a new position command. Each of the motor control devices includes a second position controller configured to compute commands to drive the plurality of motors based on a difference between the new position command and the position information.
    Type: Grant
    Filed: January 12, 2011
    Date of Patent: November 19, 2013
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Yasufumi Yoshiura, Yasuhiko Kaku
  • Patent number: 8536813
    Abstract: A rotating electromechanical machine has a rotor having at least one current-carrying winding and at least one rotor-mounted sensor configured to sense a machine property or parameter during machine operation. Rotor-mounted circuitry dynamically modifies at least one property of the current-carrying winding during machine operation in response to the sensed machine property or parameter.
    Type: Grant
    Filed: May 19, 2010
    Date of Patent: September 17, 2013
    Inventors: Roderick A. Hyde, Jordin T. Kare, Lowell L. Wood, Jr.
  • Publication number: 20130237140
    Abstract: The present invention discloses a plenum module with compartmentalized interior that is subdivided, and partitioned into separate chambers by a set of wall panels.
    Type: Application
    Filed: April 29, 2013
    Publication date: September 12, 2013
    Inventors: Joaquin Daniel CONTRERAS, John Barry EDWARDS
  • Patent number: 8525465
    Abstract: A feedback switching device and a method allow a drive control loop for a servo motor to actively switch the feedback mode in accordance with the rotating speed of the servo motor. When the servo motor is under a high speed operation, a sensorless position estimation feedback technology is used as the feedback mode; on the other hand, when the servo motor is under a low speed operation, the switching mode is automatically switched to a position sensing feedback technology. Therefore, the development needs for multi-function, high performance and low cost in the field of the servo motor control are met, and the conventional problem is solved that, when being applied to a servo driving system having a wide speed range, the single use of the position sensing feedback technology or the sensorless position estimation feedback technology fails to satisfy the application for a wide speed range.
    Type: Grant
    Filed: December 9, 2010
    Date of Patent: September 3, 2013
    Assignee: Industrial Technology Research Institute
    Inventors: Kuo-Lin Chiu, Chia-Min Ting, Hsin-Hung Chou
  • Patent number: 8519645
    Abstract: A drive signal generating unit generates a drive signal used to alternately deliver a positive current and a negative current to a coil. The drive signal is such that nonconducting periods are set before and after a positive current conducting period and the nonconducting periods are set before and after a negative current conducting period. A driver unit generates the drive current in response to the drive signal generated by the drive signal generating unit and then supplies the drive current to the coil. The drive signal generating unit sets the width of a nonconducting period such that, after the drive start of the linear vibration motor, the width of a nonconducting period to be set before at least the first conducting period of the drive signal is shorter than the width of a nonconducting period to be set before each conducting period during steady operation of the linear vibration motor.
    Type: Grant
    Filed: January 25, 2011
    Date of Patent: August 27, 2013
    Assignee: Semiconductor Components Industries, LLC
    Inventor: Tsutomu Murata
  • Patent number: 8497643
    Abstract: Disclosed is a linear scale for obtaining a distance from a reference point. A scale detection mechanism is adapted to output waveform signals of the same phase. Also the scale detection mechanism corresponds to a magnetic flux density generated by magnetic bodies of a scale element. The scale detection mechanism may be sensors. The sensors are arranged at even intervals corresponding to a scale length of the scale element. The sensors are adapted to output sine-wave signals having the same phase to continuously detect the scale element in a movement direction of the scale element. The scale element has opposite ends each has the same polarity and configured such that an output voltage of the single sensor detecting the end of the scale element is reduced to one-half of an output voltage of the single sensor detecting the remaining portion of the scale element.
    Type: Grant
    Filed: October 15, 2010
    Date of Patent: July 30, 2013
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Katsuyuki Takagi
  • Patent number: 8487569
    Abstract: A method of controlling an electric machine that includes exciting a winding of the electric machine in advance of zero-crossings of back emf by a fixed advance time over a range of speeds. Additionally, a control system for an electric machine, and a product incorporating the control system and electric machine.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: July 16, 2013
    Assignee: Dyson Technology Limited
    Inventors: Roger Michael Dawe, Andrew Charlton Clothier
  • Patent number: 8487573
    Abstract: A relay is provided in a power supply line from a battery to a motor of a starter in a vehicle. The relay is selectively switched between a contact side state where contacts short-circuit and a resistor side state where the contacts open and a resistor is inserted into the power supply line in series. When an engine is started, an ECU controlling the starter energizes the motor by driving the relay to the resistor side only for a first predetermined time in order to suppress inrush current and voltage fall due to the inrush current. The ECU detects a contact side state fixation abnormality of the relay based on a battery voltage at the time when the motor is energized by driving the relay to the resistor side.
    Type: Grant
    Filed: August 3, 2011
    Date of Patent: July 16, 2013
    Assignee: Denso Corporation
    Inventor: Ryouta Nakamura
  • Patent number: 8487579
    Abstract: A method for determining the position of a component, that is able to be moved into at least two end positions with the aid of a drive, especially of a flap for controlling fluid flows in an internal combustion engine, includes the following steps: providing an electric signal that indicates the speed of motion of an element of the drive, determining a change in position of the component by the integration of the electric signal, and determining the absolute position of the component from the change in position.
    Type: Grant
    Filed: September 29, 2008
    Date of Patent: July 16, 2013
    Assignee: Robert Bosch GmbH
    Inventors: Alex Grossmann, Mattias Hallor
  • Patent number: 8476856
    Abstract: A three-phase AC motor drive control device has a phase command calculation unit. When driving a three-phase AC motor by a three-phase alternating square-wave voltage that is converted in power according to a switching command corresponding to one cycle of the electrical angle obtained from a rotational position of the rotor of the three-phase AC motor, the phase command calculation unit performs a torque feedback calculation based on a torque deviation, obtains, based on this calculation result, a phase command that is the lead or lag angle amount of a phase to be corrected, and stores and updates this obtained phase command. To generate the switching command, the three-phase AC motor drive control device outputs a pulse pattern to an inverter, the pulse pattern being shifted in phase by the amount of the phase command with respect to the basic phase of the three-phase alternating square-wave voltage uniquely determined with respect to the one cycle of the electrical angle.
    Type: Grant
    Filed: September 15, 2010
    Date of Patent: July 2, 2013
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Shizuo Manabe
  • Patent number: 8471511
    Abstract: A voltage application unit causes switching elements to apply voltage to flow an electric current into corresponding windings to generate a revolving magnetic field. A period derivation unit derives an energization period of the windings. A signal generation unit generates a PWM signal for causing the voltage application unit to activate and deactivate the switching elements, such that a duty ratio decreases gradually in a predetermined time period subsequent to the derived energization period. A period specifying unit specifies a detection period of an electric current, which is supplied from the switching elements presently switched and deactivated, by a predetermined time period between an edge, which is caused when the PWM signal changes in level to deactivate the switching elements, and a time point in advance of the edge in the energization period.
    Type: Grant
    Filed: December 12, 2011
    Date of Patent: June 25, 2013
    Assignee: ASMO Co., Ltd.
    Inventor: Takayuki Kitagawa
  • Patent number: RE45388
    Abstract: A compact field programmable gate array (FPGA)-based digital motor controller (102), a method, and a design structure are provided. The compact FPGA-based digital motor controller (102) includes a sensor interface (206) configured to receive sensor data from one or more sensors (104) and generate conditioned sensor data. The one or more sensors (104) provide position information for a DC brushless motor (108). The compact FPGA-based digital motor controller (102) also includes a commutation control (210) configured to create switching commands to control commutation for the DC brushless motor (108). The commutation control (210) generates commutation pulses from the conditioned sensor data of the sensor interface (206). The compact FPGA-based digital motor controller (102) also includes a time inverter (208) configured to receive the commutation pulses.
    Type: Grant
    Filed: July 16, 2013
    Date of Patent: February 24, 2015
    Assignee: Hamilton Sundstrand Space Systems International, Inc.
    Inventors: Robert Wichowski, Harold J. Hansen, Kevin G. Hawes