Phase Shifted As Function Of Speed Or Position Patents (Class 318/400.14)
  • Patent number: 10279802
    Abstract: As a control of an inverter, a first pulse width modulation control switches a plurality of switching elements by generating a first pulse width modulation signal of the switching elements, and a second pulse width modulation control switches the switching elements by generating a second pulse width modulation signal of the switching elements based on a voltage modulation rate, a voltage phase, and the number of pulses per unit cycle of an electrical angle of the motor based on the torque command and has a smaller number of switchings of the switching elements than the first pulse width modulation control. The first pulse width modulation control and the second pulse width modulation control are executed in a switched manner. Execution of the second pulse width modulation control as the control of the inverter is restricted when the quietness is needed, compared with when the quietness is not needed.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: May 7, 2019
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kiyotaka Matsubara, Kenji Yamada, Toshihiro Yamamoto
  • Patent number: 10066538
    Abstract: In an aspect, an electromechanical apparatus is provided, comprising an electromagnet, a magnetically permeable rotor, a drive, a current source, a current sensor and processing logic. The electromagnet includes a magnetically permeable housing and a wire coil disposed therein. The rotor spins and is disposed in the path of a magnetic circuit generated by the electromagnet. The drive rotates the rotor relative to the electromagnet housing. The rotor and electromagnet housing vary the reluctance therebetween as the rotor rotates. The current source applies a current to the electromagnet coil, wherein, during rotation of the rotor, fluctuations in the current result in the electromagnet coil due to the aforementioned varying reluctance are superimposed on the applied current. The current sensor senses fluctuations in current in the electromagnet coil. The processing logic reads the sensed current and determines the frequency of the fluctuations, which are correlated to rotor speed.
    Type: Grant
    Filed: December 1, 2014
    Date of Patent: September 4, 2018
    Assignee: Litens Automotive Partnership
    Inventors: Yongguang Zhu, Zbyslaw Staniewicz, Noel Abreu, Bashar Yazigi, Roman Tracz
  • Patent number: 10027264
    Abstract: The invention relates to a method for generating control signals for managing the operation of a synchronous motor with one or more permanent magnets (1) comprising a stator (2), the stator comprising a number P of phases (3, 4, 5), a rotor, the rotor comprising said permanent magnet or magnets, a switching module (6) provided with a plurality of switches (K1-K6), a number N of Hall-effect sensors sensitive to a rotating electromagnetic field induced by said permanent magnet or magnets, N being no lower than 2 and strictly lower than P, the method comprising a step of acquiring status information transmitted by the sensors (9, 10) and a step of estimating at least one piece of complementary information on the basis of status information transmitted by the sensors (9, 10), the complementary information characterizing the status variation of at least one virtual sensor.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: July 17, 2018
    Assignee: SOMFY SAS
    Inventors: David Mugnier, Florian Germain
  • Patent number: 9995994
    Abstract: An image pickup apparatus includes a main mirror holder rotating between a mirror down position in an image pickup optical path and a mirror up position outside the image pickup optical path in accordance with drive of a mirror driving unit, which drives in accordance with rotation of a motor, a sub mirror holder being supported by the main mirror holder to abut against the main mirror holder positioned at the mirror up position, and a driving pin rotating in accordance with the drive of the mirror driving unit and rotating the main and sub mirror holders. The driving pin includes an abutting part that abuts against the mirror driving unit while the mirror driving unit drives. The abutting part is provided with a reduction structure to reduce a bound of the sub mirror holder when the main mirror holder reaches the mirror up position.
    Type: Grant
    Filed: February 8, 2017
    Date of Patent: June 12, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Nobuhisa Kojima
  • Patent number: 9985453
    Abstract: A power inverter including a multi-phase inverter circuit is electrically connected to a high-voltage DC power source, and includes a capacitor electrically connected between positive and negative conductors of a high-voltage bus. A normally-ON discharge switch is electrically connected in series with a discharge resistor between the positive and negative conductors of the high-voltage bus. The discharge switch includes a control gate, wherein the control gate of the discharge switch is in communication with an ignition switch. The discharge switch is controllable to an open state between the positive and negative conductors of the high-voltage bus when the ignition switch is in an ON state. The discharge switch achieves a closed state to provide a low-impedance electric current flow path through the discharge resistor between the positive and negative conductors of the high-voltage bus when the ignition switch is in an OFF state.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: May 29, 2018
    Assignee: GM Global Technology Operations LLC
    Inventors: Andrew J. Namou, Mohammad N. Anwar, Ahmad Albanna, Syed M. Kadry
  • Patent number: 9923488
    Abstract: A method, system, and computer-readable medium facilitate a soft switching technique for operating an inverter. In a full bridge inverter, a one of first set of transistors in the inverter may be rapidly activated and deactivated in pulses while one of a second set of transistor may be activated during a switching time period where the inverter matches the voltage and frequency of an AC grid. During a blanking time period between switching time periods, one of the second set of transistors may be primed before the other is activated during the next switching time period to prevent generating noise in the AC output of the inverter due to a hard switch.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: March 20, 2018
    Assignee: SunPower Corporation
    Inventor: Fernando Rodriguez
  • Patent number: 9893007
    Abstract: A semiconductor device includes a first contact receiving a first voltage, a second contact receiving a second voltage, one or more comparing elements comparing the first and second voltages, and one or more setting elements setting one or more parameters of the device in response to a comparison of the first and second voltages. When the first voltage is greater than the second voltage the setting element selects the first voltage as a high voltage, the second voltage as a low voltage, and sets a mode signal to a first value. When the second voltage is greater than the first voltage the setting element selects the first voltage as the low voltage, the second voltage as the high voltage, and sets the mode signal to a second value. The first and second values alter a condition of an electronic component coupled with the device between a first and second state.
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: February 13, 2018
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventor: Kentaro Iyoshi
  • Patent number: 9831805
    Abstract: A method for acquiring a constant torque of an ECM, the method including: A) acquiring a target torque value T0 input from external; B) when the motor is in a non-use state, operating the motor and acquiring an initial rotational speed rpm by the microprocessor; and when the motor is in an operating state, acquiring a current rotational speed rpm by the microprocessor; C) calculating a corresponding target bus current value Itad by the microprocessor using the function of a DC bus current Itad=F(T, rpm) according to the target torque T0 and acquired rotational speed rpm, in which T represents a torque value output by the motor; and D) comparing the target bus current Itad with a real-time bus current Ibus by the microprocessor in a closed-loop control according to the detected real-time bus current Ibus.
    Type: Grant
    Filed: November 16, 2016
    Date of Patent: November 28, 2017
    Assignee: ZHONGSHAN BROAD-OCEAN MOTOR CO., LTD.
    Inventor: Wenqing Bian
  • Patent number: 9774282
    Abstract: A method for controlling a three-phase brushless DC motor including a single hall sensor, the method including: A) measuring a deviation angle ? of a mounting position of the single hall sensor and storing; B) starting the motor: outputting six-path PWM signals by the microprocessor to control the operation of the inverter and allowing the single hall sensor to continuously and stably measure a position signal; C) obtaining a rotating angular velocity ?=360°/T in the last 360° electric angle cycle by the microprocessor; D) calculating a real-time position angle ?=?t+? of a present 360° electric angle cycle by the microprocessor; and E) outputting the six-path PWM signals by the microprocessor to control the operation of the inverter so as to simultaneously energize the three-phase winding (U, V, and W); and switching a current direction of each winding.
    Type: Grant
    Filed: February 13, 2015
    Date of Patent: September 26, 2017
    Assignee: ZHONGSHAN BROAD-OCEAN MOTOR MANUFACTURING CO., LTD.
    Inventor: Wenqing Bian
  • Patent number: 9735721
    Abstract: A rotary drive system having a voltage source and an electric motor. The motor has a stator with independent phases and a rotor, an inverter designed to connect each phase to the voltage source in order to generate phase currents, and a device for controlling the inverter. The control device includes a unit for determining whether the fundamental frequency of the phase currents is lower than a frequency threshold equal to, at the most, 100 Hz, and a unit for generating a command, configured such that, when the fundamental frequency is determine as being lower than the frequency threshold, the command causes the appearance of a homopolar component in the phase currents.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: August 15, 2017
    Assignee: Valeo Systemes de Controle Moteur
    Inventor: Luis De Sousa
  • Patent number: 9647605
    Abstract: A driving circuit for a single-phase-brushless motor and a method that includes a driving-signal-generating circuit configured to generate a driving signal for supplying, to a driving coil of the single-phase brushless motor, an output circuit coupled to the driving signal generating circuit; and an induced voltage zero-cross detecting circuit having a plurality of inputs and an output, a first input coupled to the driving signal generating circuit and configured to detect a zero cross of an induced voltage in response to operation in the de-energized period.
    Type: Grant
    Filed: April 3, 2014
    Date of Patent: May 9, 2017
    Assignee: SEMICONDUCTOR COMPOENENTS INDUSTRIES, LLC
    Inventor: Tsutomu Murata
  • Patent number: 9529026
    Abstract: An angle detector includes a first signal level detector to detect a sensor processed signal having a maximum signal level of a first set of sensor processed signals obtained by signal processing of multiple sensor signals, each of the multiple sensor signals having a signal level corresponding to a rotational position of a rotor of a motor having multiple coils, a signal level adjuster to adjust each signal level of the first set of the sensor processed signals to match the sensor processed signal having a maximum signal level with a first adjustment level, a signal selector to single out a selection signal from a second set of sensor processed signals adjusted by the signal level adjuster, and a phase detector to output a phase information signal in which the signal level of selection signal selected by the signal selector corresponds to a phase of the rotor.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: December 27, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventor: Katsuhisa Furuse
  • Patent number: 9479101
    Abstract: An apparatus for diagnosing motor performance of a vehicle and a method thereof are provided. The apparatus for diagnosing motor performance includes calculating magnetic flux of the motor under a predetermined diagnosis condition using a magnetic flux calculator. The apparatus further includes determining whether the calculated magnetic flux of the motor is included in a normal range using a validity determiner.
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: October 25, 2016
    Assignee: Hyundai Motor Company
    Inventors: Joo Young Park, Byung Hoon Yang
  • Patent number: 9479090
    Abstract: In accordance with an embodiment, a drive circuit is provided for driving for a motor wherein the drive circuit includes a rotational state generation circuit connected to a state controller. The state controller is connected to a pulse width modulation detection circuit, a timer, and a duty control controller. In accordance with another embodiment, a method for driving the motor includes coupling a single Hall sensor to the motor and using the single Hall sensor to determine a position of a rotor of the motor. The drive circuit pulls the rotor so that one of its north pole or south pole is adjacent to the single Hall sensor. After the pole of the rotor is adjacent to the rotor, the motor starts.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: October 25, 2016
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventor: Takashi Ogawa
  • Patent number: 9431931
    Abstract: A controller for a brushless motor that includes a PWM module configured in half-bridge or full-bridge mode. The PWM module outputs control signals for controlling the excitation of a winding of the motor, and one of the duty cycle and the period of the PWM module defines a time at which the winding is commutated.
    Type: Grant
    Filed: June 13, 2014
    Date of Patent: August 30, 2016
    Assignee: Dyson Technology Limited
    Inventors: Yongji Zhou, Libo Zheng, Hanping Dai
  • Patent number: 9369028
    Abstract: An electronically commutated motor, including: a motor body and a motor controller. The motor controller includes a control box and a circuit board disposed in the control box. The circuit board includes a microprocessor, an inverter circuit, a gear detection circuit, and a power supply. The gear detection circuit includes a plurality of current sensing units. The output end of the power supply supplies power to each circuit, and a first AC input end of the power supply is connected to a first power input line N. The gear detection circuit is connected to a plurality of gear input lines. At least one of the gear input lines is selected to be in an energized state. Each gear input line is correspondingly connected to a first input end of one of the current sensing units.
    Type: Grant
    Filed: November 14, 2014
    Date of Patent: June 14, 2016
    Assignee: ZHONGSHAN BROAD-OCEAN MOTOR CO., LTD.
    Inventors: Yong Zhao, Yunsheng Chen, Wenqing Bian, Yonghua Wu
  • Patent number: 9083273
    Abstract: A method of operating a brushless direct current motor is provided that generates a rotor position dependent pulse width modulation waveform. The waveform can improve motor efficiency and reduce torque variation.
    Type: Grant
    Filed: August 30, 2012
    Date of Patent: July 14, 2015
    Assignee: Agave Semiconductor, LLC
    Inventor: Robert Alan Brannen
  • Patent number: 9018872
    Abstract: To provide a motor control circuit that variably controls the speed of a motor, in which an appropriate advance angle value corresponding to the speed of the motor that is set can be automatically set. The motor control circuit according to the present invention includes an advance angle setting means that adds a reference advance angle value to an advance angle correction value obtained by multiplying a proportional coefficient by a correction amount and outputs an advance angle setting signal, and an advance angle setting correction means that uses a ratio of a correction reference period relative to a period of a reference signal input from the outside as a correction amount and corrects the reference advance angle value by an advance angle correction value obtained by multiplying the correction amount by a predetermined proportional coefficient of the advance angle setting means.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: April 28, 2015
    Assignees: Minebea Co., Ltd., Panasonic Corporation
    Inventors: Tomohiro Inoue, Yuji Hamada
  • Patent number: 8994319
    Abstract: An electric motor includes a magnet rotor which is placed with an air gap interposed between it and a stator and has a magnetic pole portion formed from a plastic magnet which swells by hydrogen bonds, an inverter circuit, a DC-voltage conversion portion, a driving logic control portion, a supply current value control portion, a current value designation portion, a reference current value designation portion, and a correlation designation portion, wherein the correlation designation portion determines an average current value by changing the average current value linearly or non-linearly with respect to a reference current value, and the magnetic pole portion absorbs moisture to swell, thereby making the air gap smaller, at higher humidity than a reference humidity.
    Type: Grant
    Filed: December 28, 2011
    Date of Patent: March 31, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventor: Masayuki Takada
  • Publication number: 20150082575
    Abstract: A brushless motor comprises: a stator 21 having armature coils 21a, 21b, and 21c; a rotor 22 which is rotated by a revolving magnetic field; and a switching element 30a, wherein the brushless motor has a rotation number control unit 33 which switches between low-speed and high-speed mode, wherein in the low-speed mode, the rotation number control unit 33 supplies current to the armature coils 21a, 21b, and 21c at predetermined energization timing and controls a duty ratio to control the rotation number of the rotor 22, and in the high-speed mode, the rotation number control unit 33 supplies current to the armature coils 21a, 21b, and 21c at energization timing advanced from the energization timing for the low-speed mode, thereby performing field weakening control of weakening the revolving magnetic field from that of the low-speed mode to control the rotation number of the rotor 22.
    Type: Application
    Filed: April 16, 2013
    Publication date: March 26, 2015
    Inventors: Masaaki Kimura, Hiroto Tanaka, Tamotsu Iwazaki, Tomohiko Annaka, Naoki Kojima, Junya Kitazawa
  • Patent number: 8981702
    Abstract: Input-output linearization (IOL) and extended state observer (ESO) techniques are applied to a Field Oriented Control (FOC) for Permanent Magnet Synchronous Motors (PMSM). In one such approach, at least one gain value is determined based at least in part on a given bandwidth value. Operating parameters for the motor are determined based on the at least one gain value and information from a current sensor regarding motor current. Control signals used to the control the motor are determined based on the determined operating parameters. Accordingly, automated control can be effected through setting a bandwidth value through the implementation of IOL and ESO techniques.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: March 17, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Ashish S. Katariya, David P. Magee
  • Patent number: 8975843
    Abstract: A motor control device includes a control condition storage unit storing at least one of a control condition defined by an equivalent voltage supplied to a three-phase motor and a control condition defined by relationship between the equivalent voltage supplied to the three-phase motor and a frequency of PWM signal, a control condition extracting unit extracting the control condition from the control condition storage unit in response to a temperature of a viscous fluid supplied by a pump having the three-phase motor as a power source, and a PWM controlling unit controlling a switching element included in an inverter circuit based on a PWM signal related to the extracted control condition when the three-phase motor is started.
    Type: Grant
    Filed: June 6, 2012
    Date of Patent: March 10, 2015
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventor: Yoshihiko Minato
  • Patent number: 8970156
    Abstract: A path display apparatus includes a first position command acquiring unit that acquires first position command for motors, a first position feedback acquiring unit that acquires first position feedback of each of the motors, a correction data acquiring unit that acquires correction data generated for each of the motors, a second position command calculating unit that subtracts the correction data from the first position command to calculate a second position command, a second position feedback calculating unit that subtracts the correction data from the first position feedback to calculate second position feedback, a command path display unit that displays a command path of the tip point of the tool, based on the second position command; and a feedback path display unit that displays a feedback path of the tip point of the tool, based on the second position feedback.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: March 3, 2015
    Assignee: FANUC Corporation
    Inventors: Junichi Tezuka, Hajime Ogawa
  • Patent number: 8963460
    Abstract: A method for controlling a motor is provided. The method comprises obtaining electrical signals of the motor with a signal unit, the electrical signals comprising a motor torque and an angular velocity, calculating a voltage phase angle of a voltage vector with a calculating component, wherein a command torque, the motor torque, the angular velocity and a voltage amplitude of the voltage vector are inputs of the calculating component, and wherein the voltage phase angle is a variable and the voltage amplitude is a constant. The method further comprises modulating the voltage phase angle and the voltage amplitude to a switching signal for controlling an inverter; converting a direct current voltage to the voltage vector according to the switching signal, and applying the voltage vector to the motor.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: February 24, 2015
    Assignee: General Electric Company
    Inventors: Yong Li, Pengju Kang, Ronghui Zhou, Xiangming Shen, Xiao Chen, Zili Cai, Tong Zhao
  • Patent number: 8957617
    Abstract: The present invention discloses a controller and a method for improving motor driving efficiency. According to the present invention, multiple control parameters are inputted to the controller so that the controller can adjust timings of PWM driving signals for driving the motor to advance or delay the turned-ON or turned-OFF points, whereby the motor is driven efficiently.
    Type: Grant
    Filed: March 27, 2013
    Date of Patent: February 17, 2015
    Assignee: Padauk Technology Co., Ltd.
    Inventor: Mao-Hsin Cheng
  • Patent number: 8957615
    Abstract: There is provided a motor driving apparatus capable of optimizing driving efficiency by adjusting a phase difference between current applied to a motor and voltage detected from the motor and performing the adjustment of the phase difference when a pulse width modulation (PWM) signal has a set duty. The motor driving apparatus includes: a driving unit driving a motor according to driving control; a driving controlling unit controlling the driving of the motor by the driving unit, based on an adjusted phase correction signal; and a phase correcting unit correcting a phase difference between a motor detection signal having motor rotation speed information and a current detection signal having detection information regarding current flowing in the motor when a duty of a pulse width modulation (PWM) signal driving the motor satisfies a preset reference duty, and providing the phase correction signal to the driving controlling unit.
    Type: Grant
    Filed: October 25, 2012
    Date of Patent: February 17, 2015
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Joo Yul Ko
  • Patent number: 8941346
    Abstract: A control system (128) for controlling a switched reluctance (SR) machine (110) having a rotor (116) and a stator (118) is provided. The control system (128) may include a converter circuit (122) operatively coupled to the stator (118) and including a plurality of switches (132) in selective communication with each phase of the stator (118) and a controller (130) in communication with each of the stator (118) and the converter circuit (122). The controller (130) may be configured to determine a position of the rotor (116) relative to the stator (118), and generate a modulated switching frequency (152) based on the rotor position.
    Type: Grant
    Filed: October 31, 2012
    Date of Patent: January 27, 2015
    Assignee: Caterpillar Inc.
    Inventors: Brett Nee, Joshua Williams
  • Patent number: 8941349
    Abstract: A motor drive circuit includes: an advance angle setting correcting device having a correction reference cycle according to a reference advance angle count value, in which a correction amount is calculated as a ratio of the correction reference cycle to a cycle of a detection signal indicating a detected frequency proportional to a motor rotation speed, and in which an advance angle setting signal is obtained by multiplying the correction amount by a proportionality factor; and an advance angle setting device in which the advance angle correction value is added to the reference advance angle count value thereby outputting an advance angle setting signal, wherein a drive command signal containing a rotation speed information based on a target rotation speed is externally fed, the motor rotation speed is variably controlled in response to the drive command signal, and the detection signal is fed from a rotation speed detecting device.
    Type: Grant
    Filed: April 10, 2013
    Date of Patent: January 27, 2015
    Assignee: Minebea Co., Ltd.
    Inventor: Tomohiro Inoue
  • Publication number: 20150023804
    Abstract: A driving device for a brushless DC motor having at least one coil ma include a voltage zero crossing detection unit to where an induced voltage becomes zero; a detection period setting unit to set at least one detection period synchronously with the voltage zero crossing point; a coil voltage detection comparator to compare a terminal voltage generated from one end of the coil with a threshold voltage, and generate a coil voltage detection signal indicating a comparison result; a current phase detection unit to generate a phase detection signal indicating a relationship between a phase of a coil current flowing through the coil and a phase of the induced voltage; a driving signal synthesis unit to generate a driving control signal based on the phase detection signal; and a driving circuit to drive the brushless DC motor based on the driving control signal.
    Type: Application
    Filed: July 22, 2014
    Publication date: January 22, 2015
    Inventor: Kenji SUGIURA
  • Patent number: 8937450
    Abstract: A motor driving system including command value output means configured to output an analog value according to a rotation speed command; a first power line having first switching means; a drive circuit, to which power is supplied via the first switching means and the first power line, driving a motor supplying rotation based on the analog value; and switching control means configured to make the first switching means nonconductive when the analog value is smaller than a first predetermined value, and independent of the command value output means.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: January 20, 2015
    Assignee: Daikin Industries, Ltd.
    Inventors: Shin Higashiyama, Satoshi Yagi
  • Patent number: 8922155
    Abstract: In various implementations, a condition of a motor may be monitored based at least partially on time required to achieve a change in speed. A notification may be transmitted based on the condition of the motor.
    Type: Grant
    Filed: December 10, 2012
    Date of Patent: December 30, 2014
    Assignee: Lennox Industries Inc.
    Inventors: Joe Powell, Randall L. Lisbona
  • Patent number: 8922144
    Abstract: Methods and systems of processing sensor signals to determine motion of a motor shaft are disclosed. This disclosure relates to the processing of sequences of pulses from a sensor for computing the motion of an electric motor output shaft. Furthermore, this disclosure relates to the processing of two sequences of pulses from sensor outputs, which may be separated by only a few electrical degrees, to compute the motion of an electrical motor output shaft while using a limited bandwidth controller. Motor shaft direction, displacement, speed, phase, and phase offset may be determined from processing the sensor signals.
    Type: Grant
    Filed: June 25, 2012
    Date of Patent: December 30, 2014
    Assignee: Chrysler Group LLC
    Inventors: Feisel Weslati, Behrouz Ashrafi, Chandan Lakshmanaiah
  • Patent number: 8917041
    Abstract: A phase-shift detection circuit detects a phase shift in motor driving, using pulse-shaped position detection signal Rd and measurement signal Ms. The position detection signal is based on sensor signal Hs from a position sensor disposed in a motor. The measurement signal is based on the induced voltage from windings. The phase-shift detection circuit includes a level difference calculator and a phase-shift calculator. The level difference calculator calculates a level difference between the level of measurement signal Ms at a rising timing of position detection signal Rd and the level of measurement signal Ms at a falling timing thereof. The phase-shift calculator calculates the amount of phase shifts based on the level difference.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: December 23, 2014
    Assignee: Panasonic Corporation
    Inventors: Kenichi Kishimoto, Mineaki Isoda, Daisuke Sato, Ryuta Sasaki
  • Publication number: 20140368141
    Abstract: A method of controlling a brushless permanent-magnet motor. The method includes commutating a winding of the motor at times relative to zero-crossings of back EMF in the winding. Commutation is then advanced when the motor operates over a first speed range, and commutation is retarded when the motor operates over a second speed range higher than that of the first speed range.
    Type: Application
    Filed: June 13, 2014
    Publication date: December 18, 2014
    Inventors: Libo ZHENG, Yongji ZHOU, Tuncay CELIK
  • Patent number: 8896258
    Abstract: A method for starting an electric motor having a rotor, comprising the following steps:—driving the rotor with a first torque in a first rotational direction, wherein a maximum value of the first torque is not higher than a maximum countertorque acting counter to the rotation of the rotor, so that the rotor comes to a standstill in a first stationary position;—driving the rotor starting from the first stationary position in a second rotational direction that is counter to the first rotational direction until the rotor comes to a standstill in a predefined second stationary position; and—starting from the rotor in the first rotational direction starting from the second stationary position.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: November 25, 2014
    Assignee: BSH Bosch und Siemens Hausgeraete GmbH
    Inventors: Falko Abel, Eberhard Weidner
  • Publication number: 20140340011
    Abstract: The present invention is a high efficiency permanent magnet machine capable of maintaining high power density. The machine is operable over a wide range of power output. The improved efficiency is due in part to copper wires with a current density lower than traditional designs and larger permanent magnets coupled with a large air gap. In a certain embodiment wide stator teeth are used to provide additional improved efficiency through significantly reducing magnetic saturation resulting in lower current. The machine also has a much smaller torque angle than that in traditional design at rated load and thus has a higher overload handling capability and improved efficiency. In addition, when the machine is used as a motor, an adaptive phase lag compensation scheme helps the sensorless field oriented control (FOC) scheme to perform more accurately.
    Type: Application
    Filed: August 1, 2014
    Publication date: November 20, 2014
    Inventors: Xinzhang Wu, Hanzhou Liu, Yang Hu, Louis Chow, Jon Harms, Martin Epstein, Wei Wu
  • Patent number: 8866423
    Abstract: An electric motor in an appliance and a method of controlling the motor to achieve speeds greater than a base speed of the motor is provided. To achieve speeds above the base speed of the motor, field weakening can be implemented by applying a field weakening angle to a phase advance angle between a desired stator flux and a rotor flux. The field weakening angle can be based on the current speed of the motor. The field weakening angle can be a fixed angle and can be determined by comparing the current speed of the motor with a predetermined threshold. In addition, the magnitude of the electrical signal applied to the motor can be adjusted during field weakening based on a desired speed of the motor where the electrical signal can be a voltage.
    Type: Grant
    Filed: August 21, 2012
    Date of Patent: October 21, 2014
    Assignee: General Electric Company
    Inventors: Richard D. Suel, II, Abhijeet A. Bhandwale
  • Patent number: 8866433
    Abstract: A method of estimating an initial rotor position of a switched reluctance (SR) machine having a rotor and a stator is provided. The method may comprise the steps of driving a phase current in each of a plurality of phases of the SR machine to a predefined limit, performing an integration of a common bus voltage associated with each phase, determining a flux value for each phase based on the integrations, and determining the initial rotor position based on the flux values.
    Type: Grant
    Filed: October 31, 2012
    Date of Patent: October 21, 2014
    Assignee: Caterpillar Inc.
    Inventors: Jesse Gerdes, Jackson Wai, Mark Hartman, Ahmed Khalil, Carlos Nino Baron
  • Patent number: 8847541
    Abstract: A motor inverter is provided with switching elements for each phase of a 3-phase motor, and driving the motor by turning on and off the switching elements. In an example of a control device of the motor inverter, the control device includes: a stationary phase determination unit for defining a phase in a plurality of phases provided with switching elements for each area as a stationary phase in which a switching operation is not performed, based on current command value of each phase acquired from d-axis current command value and q-axis current command value of the motor, with one rotation in electrical angle of a rotor of the motor divided into a plurality of areas; and a drive unit for performing the switching operation of switching elements of the phases other than the stationary phase determined for each area to perform, and realizing 2-phase modulation control.
    Type: Grant
    Filed: March 20, 2012
    Date of Patent: September 30, 2014
    Assignee: Kabushiki Kaisha Toyota Jidoshokki
    Inventors: Daiki Mizuguchi, Shigeki Ikeda, Seiki Sakata
  • Patent number: 8836261
    Abstract: A detection control system includes a sensing unit, a control module and a driving module for a motor including a rotor and a stator. The sensing unit electrically connects the motor to sense a first and a second magnetic pole of the rotor cross a chip disposed between the rotor and the stator; a third magnetic pole is alternated to a forth magnetic pole of the stator to generate a sensing signal. A detection unit of the control module detects a kickback voltage value generated by a first current value changing to a second current value to calculate a minimum current value to generate a detecting signal. A timing unit receives the sensing and the detecting signal to calculate a first and a second period of time, and a discharging time. The driving module drives the rotor by receiving a control signal the control unit generates by controlling an alternating time.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: September 16, 2014
    Assignee: Feeling Technology Corp.
    Inventors: Sheng-Hsiang Yen, Hsuan-Chuan Chen
  • Patent number: 8836262
    Abstract: In a method for the determination of a current initial rotational position of a rotor and in an arrangement for carrying out same, an incremental position encoder outputs an output signal. The output signal is produced by superposition of a chronologically random and systematically fluctuating signal interference on a basic signal, and composed of at least two component signals which change periodically in accordance with the rotational position of the rotor and are in a fixed angular relationship to one another. To determine the position, the output signal is used exclusively. The current initial rotational position of the rotor relative to a reference initial rotational position is determined by comparing the time profile of the portion of the systematically fluctuating signal interference of a current measured value sequence of the signal and the measured values of a signal sequence acquired starting from the reference initial rotational position.
    Type: Grant
    Filed: November 8, 2012
    Date of Patent: September 16, 2014
    Assignee: Dr. Fritz Faulhaber GmbH & Co. KG
    Inventors: Andreas Wagener, Achim Haag
  • Patent number: 8836268
    Abstract: A pulse signal output unit sends three-phase pulse signals according to movement of the movable member. A counter unit adds a first predetermined value or a second predetermined value to a count value or subtracts the first predetermined value or the second predetermined value from the count value, according to a combination of the pulse signals appearing when all the pulse signals are normal and a combination of the pulse signals appearing when one of the pulse signals malfunctions. A position detection unit detects the position of the movable member according to the count value.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: September 16, 2014
    Assignee: Denso Corporation
    Inventor: Takuya Yoshida
  • Patent number: 8836255
    Abstract: A control device that controls an electric motor drive device including a DC/AC conversion section that converts a DC voltage into an AC voltage using a detected angle detected by a resolver provided in an AC electric motor to supply the resulting AC voltage to the AC electric motor. The control device includes a correction information acquisition section that acquires first correction information on the basis of the rotational speed, and that acquires the second correction information on the basis of the modulation rate at the angle acquisition time point in the case where the rotational speed at the angle acquisition time point is less than the rotational speed threshold. A detected angle correction section corrects the detected angle on the basis of the correction information acquired by the correction information acquisition section.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: September 16, 2014
    Assignee: Aisin AW Co., Ltd.
    Inventors: Keisuke Nishimura, Takeshi Aoki
  • Patent number: 8823314
    Abstract: A system and method are provided for reducing the energy consumed by a pump jack electric motor by reducing the supply voltage to the motor when the motor would be generating energy in open loop mode. By substantially eliminating the energy generation mode, the braking action of the utility grid in limiting the acceleration of the motor and system that would otherwise occur is substantially removed. The motor and system will speed up, allowing the natural kinetic energy of the cyclic motion to perform part of the pumping action. A closed loop controller in electrical connection with the motor computes the necessary information from the observed phase angle between the voltage and current supplied to the motor. By reducing the supply voltage to the motor, the observed phase angle may be reduced to a target phase angle value.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: September 2, 2014
    Assignee: The Powerwise Group, Inc.
    Inventors: John L. Lumsden, Paul H. Kelley, Vasan Venkataraman
  • Publication number: 20140239860
    Abstract: A motor control system comprising a motor configured to operate at a rotational velocity and a control module in communication with the motor is provided. The control module is configured to receive a torque command indicating a desired amount of torque to be generated by the motor, obtain a rotational velocity of the motor, receive a desired phase advance angle for driving the motor; and generate a voltage command indicating a voltage magnitude to be applied to the motor based on the rotational velocity of the motor, the motor torque command, and the desired phase advance angle by using a plurality of dynamic inverse motor model equations that (i) allow the desired phase advance angle to exceed an impedance angle of the motor and (ii) specify that the voltage magnitude is a function of a voltage magnitude of a previous voltage command.
    Type: Application
    Filed: February 26, 2014
    Publication date: August 28, 2014
    Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION
    Inventor: Julie A. Kleinau
  • Patent number: 8803454
    Abstract: Embodiments of the present invention permit the optimization of torque control of a permanent magnet machine including obtaining instantaneous terminal voltages of the machine, transforming the instantaneous terminal voltages to a zero direct axis voltage and a non-zero quadrature axis voltage, using a mathematical transformation, regulating the electrical frequency of the permanent-magnet machine such that the zero direct-axis voltage is adjusted to have a value of zero, determining a non-final electrical angle of the permanent-magnet machine by applying an integrator to the regulated electrical frequency of the machine, determining a final electrical angle of the of the machine by integrating the non-final electrical angle and an electrical angle from a previous calculation cycle, and regulating the current vector of the machine such that the current vector is perpendicular to the final electrical angle of the machine, thereby optimizing the torque of the machine.
    Type: Grant
    Filed: July 12, 2012
    Date of Patent: August 12, 2014
    Assignee: AeroVironment, Inc.
    Inventors: Zaher Abdallah Daboussi, Scott Garrett Berman
  • Patent number: 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
  • Publication number: 20140203743
    Abstract: The present invention relates to a drive apparatus that drives a brushless motor with a square wave, and relates to a drive method thereof. The drive apparatus limits a duty cycle of once in N times of pulse width modulation periods so that the duty cycle does not fall below a set value, and increases the N value according to a rotation speed of the brushless motor, and then obtains position information in a period in which the duty cycle is limited to the predetermined duty cycle. Then, when the rotation speed cannot be decreased to a target rotation speed even when an average duty cycle is decreased to a limit, electric angles of a switching period of an energization pattern are switched from 60 degrees to 120 degrees.
    Type: Application
    Filed: September 27, 2013
    Publication date: July 24, 2014
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventor: Naoki OKAMOTO
  • Patent number: 8779712
    Abstract: A motor control device including: a following control unit that calculates a pre-correction torque command based on a difference between an operation command signal for commanding an operation of a motor and a detection signal resulting from detecting an operation of the motor; an adder that outputs a post-correction torque command by adding the pre-correction torque command to a correction torque command; and an electric-current control unit that outputs a drive current driving the motor based on the post-correction torque command, wherein the motor control device executes control so that the detection signal matches the operation command signal, and further including: a reference-periodic-signal computation unit; an amplitude/phase estimation unit; and a correction-torque computation unit, so that the correction torque command is updated such that a difference between the correction torque command and the post-correction torque command becomes smaller.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: July 15, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Akira Tanabe, Hiroyuki Sekiguchi, Hidetoshi Ikeda
  • 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