With Timing, Delay, Or Clock Pulse Counting Circuit Or Generation Patents (Class 318/400.13)
  • Patent number: 10536100
    Abstract: A system according to the present disclosure includes a motor driver module and a motor position determination module. The motor driver module is configured to measure current supplied to a motor. The motor position determination module is configured to determine a first position of the motor at a first time when power supply to the motor is initially discontinued based on ripples in the current supplied to the motor during a first period before the first time. The motor position determination module is configured to determine a second position of the motor at a second time when the motor stops rotating after power supply to the motor is discontinued based on the first position of the motor and a rotational speed of the motor at the first time.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: January 14, 2020
    Assignee: GENTHERM INCORPORATED
    Inventors: Patrick Jordan, Dusko Petrovski
  • Patent number: 10519961
    Abstract: A ventilation device includes AC voltage estimation unit (32) for estimating an AC voltage, based on a DC voltage detected by voltage detection unit (30) and a current detected by current detection unit (20). Air volume computation unit (24) determines a rotation speed of a motor, based on the AC voltage estimated by AC voltage estimation unit (32) and a target air volume output from a target air volume computation unit.
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: December 31, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Kazuki Doumoto, Tsuraki Nakajima, Harumoto Itou, Yuusuke Urata
  • Patent number: 10505482
    Abstract: In a magnetic pole direction detection device, a detecting target magnet is attached to a tip of a rotating shaft of the rotor. A magnetic detection unit outputs a detection signal which changes according to a change in a magnetic field. A magnetic pole direction calculation unit calculates a magnetic pole direction of a rotor based on the detection signal. A current detection unit detects a current flowing through each multiphase coil. A rotating magnetic field vector calculation unit calculates a vector of a rotating magnetic field based on magnitude of the detected current. A direction correction amount calculation unit calculates a direction correction amount based on a direction and magnitude of the rotating magnetic field calculated by the rotating magnetic field vector calculation unit. A magnetic pole direction correction unit corrects the calculated magnetic pole direction by using the calculated direction correction amount calculated.
    Type: Grant
    Filed: November 20, 2018
    Date of Patent: December 10, 2019
    Assignee: OMRON AUTOMOTIVE ELECTRONICS CO., LTD.
    Inventors: Yoji Mori, Tomoya Yamanaka
  • Patent number: 10483900
    Abstract: A system for controlling an inverter may include a motor; then inverter including a plurality of switching elements turned on/off by a pulse width modulation signal, converting DC power into AC power according to on/off of the plurality of switching elements and providing the AC power to the motor; a current sensor for detecting and outputting a current provided to the motor; a rotation angle sensor for detecting and outputting a rotor angle of the motor; and a controller for performing duty determination control for determining a duty of the pulse width modulation signal on the basis of values detected by the current sensor and the rotation angle sensor and a torque command of the motor.
    Type: Grant
    Filed: September 17, 2018
    Date of Patent: November 19, 2019
    Assignees: Hyundai Motor Company, Kia Motors Corp.
    Inventors: Joo Young Park, Mu Shin Kwak, Jae Ho Hwang, Su Hyun Bae, Yong Jae Lee, Sung Kyu Kim
  • Patent number: 10439527
    Abstract: A motor control device includes an energization controller that generates energization control signals of a bridge driver, an ADC that samples and converts analog feedback voltages corresponding to output voltages of the bridge driver into digital feedback signals, and a zero-crossing detector that receives the feedback signals so as to perform zero-crossing detection for determining commutation timing and PWM duty of the energization control signal. Sampling timings of the ADC are switched to one of PWM on period and PWM off period according to the PWM duty. The energization controller PWM drives lower side switches of the bridge driver, and the sampling timings of the ADC are set to the PWM off period. The ADC performs an ADC process of the feedback voltage both in the PWM on period and in the PWM off period, and the zero-crossing detector adopts one of ADC results according to the PWM duty.
    Type: Grant
    Filed: June 2, 2017
    Date of Patent: October 8, 2019
    Assignee: Rohm Co., Ltd.
    Inventors: Naoyuki Usagawa, Takahiro Nishiyama
  • Patent number: 10432122
    Abstract: The invention relates to a method for sensor-free position determination of the rotor position of an electronically commutated multiple-phase EC motor comprising a rotor, and a stator and comprising a commutation device for generating string currents in the coil system of the stator by applying a test signal in the coil system, measuring the current value i in the strand during the measurement phase (PHMess) as a current response to the test signal, calculating i for determining the envelope determining of the current response and determining the rotor position therefrom.
    Type: Grant
    Filed: March 10, 2016
    Date of Patent: October 1, 2019
    Assignee: ebm-papst Mulfingen GmbH & Co. KG
    Inventors: Markus Neber, Thomas Ley, Jens Krotsch
  • Patent number: 10411622
    Abstract: The control part includes: a gate control voltage output unit that is configured to output a drive signal which switches a switching element according to a Hall edge that forms each of six Hall stages which are represented by a combination of electric potentials of position detection signals that are outputs of a plurality of sensors; a counter value acquisition unit that is configured to acquire a counter value which is a time period of the Hall stage and which is represented by a time period between two Hall edges that form each of the Hall stages from the position detection signal; and a switching control unit that is configured to determine a value obtained by multiplying a previous counter value of each of the Hall stages by a preset correction coefficient as a delay time of each of current Hall edges and that allows the gate control voltage output unit to output a drive signal according to each of the Hall edges which are corrected by the delay time.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: September 10, 2019
    Assignee: Mitsuba Corporation
    Inventor: Takeshi Ikeda
  • Patent number: 10344975
    Abstract: A control module for preventing acoustic resonance noise generation from a heat exchanger of a heating furnace, comprising a control signal generated by the control module. The control signal is configured to operate an induction fan of the heating furnace at more than one speed for a given heat demand mode of the heating furnace.
    Type: Grant
    Filed: April 19, 2018
    Date of Patent: July 9, 2019
    Assignee: Lennox Industries Inc.
    Inventor: Shiblee S. M. Noman
  • Patent number: 10291174
    Abstract: In a control apparatus for a power conversion apparatus, a spectrum changing unit changes a spectrum of at least one of bus harmonic components and switch harmonic components so as to meet at least one of a separation condition and a reduction condition. The bus harmonic components are harmonic components superimposed on a voltage of the bus in accompaniment with on-off operations of switches configuring at least one power conversion apparatuses. The switch harmonic components are harmonic components included in a switching pattern of switches configuring the remaining at least one power conversion apparatus. The separation condition is that the frequencies of both harmonic components are separated by a predetermined value or more. The reduction condition is that an amplitude of at least one harmonic component is reduced when the difference between the frequencies of both harmonic components is less than the predetermined value.
    Type: Grant
    Filed: May 15, 2017
    Date of Patent: May 14, 2019
    Assignee: DENSO CORPORATION
    Inventors: Koji Irie, Hidekazu Takahashi
  • Patent number: 10277156
    Abstract: The invention relates to an architecture which is applied to a six-phase rotary electric machine of the type comprising first and second three-phase systems offset angularly at a predetermined offset angle. First and second phase windings of the three-phase systems respectively carry first (U1, V1, W1) and second (U2, V2, W2) phase currents controlled by electronic power modules (15, 16, 17). The electronic modules comprise first and second power terminals (12, 13) each capable of being electrically connected to first and second instances of the first and second phase windings. According to the invention, the electronic power modules are interconnected such as to balance the losses.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: April 30, 2019
    Assignee: Valeo Equipements Electriques Moteur
    Inventor: Luc Kobylanski
  • Patent number: 10243491
    Abstract: A power tool includes a multi-phase BLDC motor, a plurality of switches, an input unit, and a controller. For each phase, the controller operates to vary power output to the motor between a first power and a second power by varying a duty cycle of a PWM signal from 0% to 100% while keeping a conduction band (CB) of corresponding motor switches and/or an advance angle (AA) at a predetermined value when the input unit moves between a first position and a predetermined position between the first and a second position. For each phase, the controller operates to increase the power output by the motor to greater than the second power by increasing the CB/AA to greater than the predetermined value while keeping the duty cycle of the PWM signal at 100% when the input unit moves between the predetermined position and the second position.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: March 26, 2019
    Assignee: Black & Decker Inc.
    Inventors: John D. Cox, Tal Gottesman
  • Patent number: 10186993
    Abstract: A motor control system includes a motor driving circuit and a motor. The motor driving circuit includes a control module, a PWM signal detecting module, a transient state detecting module and a driving module. The PWM signal detecting module is electrically connected to the control module to receive a PWM signal and to convert the PWM signal into a first digital PWM control signal. The transient state detecting module provides a second digital PWM control signal to the control module according to the first digital PWM control signal at a first time point and the first digital PWM control signal at a second time point. The driving module receives at least one driving signal from the control module. The control module determines whether to turn off a low side switch of the driving module according to the second digital PWM control signal.
    Type: Grant
    Filed: July 28, 2017
    Date of Patent: January 22, 2019
    Assignee: ANPEC ELECTRONICS CORPORATION
    Inventors: Kun-Min Chen, I-Lin Chiu
  • Patent number: 10138857
    Abstract: A rotor of a starter that employs an SR motor is directly connected to a crank shaft of an engine. The rotor and the crank shaft are set in such a way that when a piston is positioned at a top dead center or the like, salient poles and of the rotor face U-phase poles, so that an output torque of the starter comes to its maximum at a maximum pass-over torque position of the engine. When the engine is stopped, electricity is supplied through U-phase coils, thereby making the salient poles and the U-phase poles stop so as to face each other. In this manner, the piston is stopped at the maximum pass-over torque position. When the engine is started, electricity is supplied to W-phase coils which are adjacent to the U-phase coils, thereby making it possible to overcome a maximum friction torque with maximum outputs.
    Type: Grant
    Filed: June 13, 2016
    Date of Patent: November 27, 2018
    Assignee: MITSUBA CORPORATION
    Inventors: Daisuke Semba, Noriyuki Aramaki, Ken Noguchi, Masayuki Okubo
  • Patent number: 10033269
    Abstract: In one example, a circuit includes an alternating current (AC) voltage source, a voltage rail, a reference rail, a first capacitor, a second capacitor, and a switching unit. The AC voltage source is configured to supply voltage in a first direction during a first half of a cycle and supply voltage in a second direction during a second half of the cycle. During a first state of the circuit, the voltage in the first direction supplied by the AC voltage source charges the first capacitor and the voltage in the second direction supplied by the AC voltage source charges the first capacitor. During a second state of the circuit, the voltage in the first direction supplied by the AC voltage source charges the first capacitor and the voltage in the second direction supplied by the AC voltage source charges the second capacitor.
    Type: Grant
    Filed: April 29, 2016
    Date of Patent: July 24, 2018
    Assignee: Infineon Technologies Austria AG
    Inventors: Kennith Kin Leong, Anders Lind
  • Patent number: 9948108
    Abstract: Provided are DC-bus voltage or DC-bus current controller methods and circuits, for a voltage or current source inverter. A mean value calculator provides an output signal comprising the mean value of the DC-bus voltage or current, which is used as a feedback signal in a closed loop of the voltage or current source inverter controller, such that a ripple in the DC-bus voltage or current is substantially prevented from entering the closed-loop. In some embodiments a droop controller, which may be adaptive, is used in the closed loop with reverse proportional gain. The adaptive droop controller may provide a constant or variable DC-bus voltage or current. Embodiments regulate the DC-bus voltage or current to an optimized value such that power losses for load and grid conditions are minimized or reduced, and voltage and current ripple is minimized.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: April 17, 2018
    Assignee: SPARQ Systems Inc.
    Inventors: Suzan Eren, Majid Pahlevaninezhad, Alireza Bakhshai, Praveen K. Jain
  • Patent number: 9923493
    Abstract: A drive circuit for a synchronous motor including a rotor having ten magnetic poles formed by a permanent magnet, and a stator in which a winding is wound in a concentrated manner around nine teeth facing the rotor, the drive circuit including: an inverter including a plurality of switching elements in bridge connection; and a control unit that controls the inverter in such a manner that a square-wave-shaped current flows to the winding, wherein the control unit operates in such a manner that an energization phase at which to pass the square-wave-shaped current falls within a range of electric angles of ?10° to +5° from an energization phase at which the current is minimum when a target torque of the synchronous motor is generated.
    Type: Grant
    Filed: January 9, 2014
    Date of Patent: March 20, 2018
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Atsushi Matsuoka, Kazuhiko Baba, Hiroyuki Ishii
  • Patent number: 9887651
    Abstract: A method and apparatus for driving motor and appliance. When a rotor of a motor rotates, a current angle of the rotor is detected at a current moment by using a Hall sensor; a back electromotive force and a phase current of the motor is detected at the current moment; a target torque coefficient is detected by using a relational model for a back electromotive force and a torque coefficient according to the back electromotive force; a current torque coefficient is detected by using a relational model for a phase current and a torque coefficient according to the detected phase current; and a compensation angle is detected according to a rotor angle compensation model and the current angle is compensated by using the compensation angle, to obtain an adjustment angle; and power supply to the motor is adjusted according to the adjustment angle by using a field orientation technology.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: February 6, 2018
    Assignee: Guangdong Welling Motor Manufacturing Co., Ltd.
    Inventors: Yanchao Fu, Zhiqiang Ge, Jie Jie, Xiaoan Zhao, Liming Gong
  • Patent number: 9876449
    Abstract: A drive circuit for a synchronous motor including a rotor having ten magnetic poles formed by a permanent magnet, and a stator in which a winding is wound in a concentrated manner around nine teeth facing the rotor, the drive circuit including: an inverter including a plurality of switching elements in bridge connection; and a control unit that controls the inverter in such a manner that a square-wave-shaped current flows to the winding, wherein the control unit operates in such a manner that an energization phase at which to pass the square-wave-shaped current falls within a range of electric angles of ?10° to +5° from an energization phase at which the current is minimum when a target torque of the synchronous motor is generated.
    Type: Grant
    Filed: January 9, 2014
    Date of Patent: January 23, 2018
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Atsushi Matsuoka, Kazuhiko Baba, Hiroyuki Ishii
  • Patent number: 9876447
    Abstract: A motor system includes a stator magnetic pole, a driving unit and a stop control unit. The stator magnetic pole is adapted to couple with a rotor for the rotor to rotate relative to the stator magnetic pole. The stator magnetic pole has first and second ends. The driving unit is electrically connected with the stator magnetic pole and drives the rotor to rotate by changing the polarity of the stator magnetic pole. The stop control unit is electrically connected to the stator magnetic pole and the driving unit. If the rotor rotates when the motor system is not electrically powered, the stator magnetic pole generates electricity that changes the path of the electric current flowing through the stop control unit, and the stator magnetic pole outputs an electric current from the first end to the second end or from the second end to the first end thereof. In addition, a fan module is also disclosed to solve the problem.
    Type: Grant
    Filed: June 7, 2016
    Date of Patent: January 23, 2018
    Assignee: Sunon Electronics (Foshan) Co., Ltd.
    Inventors: Alex Horng, Hung-Chin Mai, Chien-Cheng Wang
  • Patent number: 9866158
    Abstract: The present disclosure provides a method for monitoring a rotor position sensor of a PSM machine having at least three phases operated by a field oriented control, where the electrical angle of the PSM machine may corresponds with a rotor position. A first calculation of the electrical angle of the PSM machine may be based on a measured mechanical rotor position and the pole-pair number of the PSM machine. A second calculation of the electrical angle of the PSM machine may be based on the phase of a phase current indicator and regulated target currents in the d,q-coordinate system. The method may include a comparison of the values of the respective electrical angles of the PSM machine determined by the first calculation and the second calculation.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: January 9, 2018
    Assignee: ZF Friedrichshafen AG
    Inventor: Hassan Lamsahel
  • Patent number: 9859830
    Abstract: Systems for controlled resonance in electrical power devices are described. A programmed signal processor generates output control signals from input electrical signals based on resonant control parameters for a target power device. Analog electrical control systems for controlled resonance, power devices incorporating controlled resonance, and opto-programmed controllers for use in controlled resonance applications are described, with example embodiments for electro-mechanical systems with resonant constructive power drive action for electric motors.
    Type: Grant
    Filed: July 13, 2016
    Date of Patent: January 2, 2018
    Assignee: Opto Generic Devices Inc.
    Inventors: Ormonde G. Durham, Edward E. Lakata
  • Patent number: 9806634
    Abstract: According to one embodiment, an inverter controller includes a current controller which calculates and output PWM modulation ratio instructions of a first phase and a second phase, such that an inverter outputs a predetermined current; a switching timing arithmetic unit which calculates timings at which switches of the respective phases are opened and closed; a simultaneous switching avoiding unit which determines whether a first switching timing for changing over the switch of the first phase and a second switching timing for changing over the switch of the second phase coincide or not, and to generate, upon determining that the first switching timing and the second switching timing coincide, triangular-wave carriers of the first phase and the second phase by making different waveforms of the triangular-wave carriers; and a switch opening/closing timing generator which calculates a timing for opening/closing the switch.
    Type: Grant
    Filed: February 23, 2015
    Date of Patent: October 31, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Masaru Kano, Shoichiro Tanaka
  • Patent number: 9772381
    Abstract: One embodiment describes a method that includes, when a motor is disconnected from a power source: starting, using a control circuitry, a counter at a first voltage zero-crossing by either a source voltage or a back electromotive force generated by the motor; stopping, using the control circuitry, the counter at a next subsequent second voltage zero-crossing by either the source voltage or the back electromotive force; monitoring, using the control circuitry, a trend in counter values; and instructing, using the control circuitry, one or more switching devices to reconnect the power source to the motor after a local minimum in the counter value trend such that the source voltage is leading the back electromotive force.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: September 26, 2017
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Christopher H. Bock, Christopher J. Wieloch, James J. Kinsella, Stefan T. Dziekonski
  • Patent number: 9722516
    Abstract: In accordance with an embodiment, a drive circuit is provided for driving for a motor wherein the drive circuit includes a first signal generator coupled to a second signal generator. A bias generator is connected to the second signal generator. In accordance with another embodiment, a method for driving a motor is provided that includes comparing a first signal at a first output of a Hall sensor with a second signal at a second output of the Hall sensor to generate a comparison signal. An indicator signal is generated in response to the comparison signal, wherein the indicator signal has a first edge and a second edge. A bias signal for the Hall sensor is generated in response to the indicator signal in response to the indicator signal.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: August 1, 2017
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventor: Takashi Ogawa
  • Patent number: 9627998
    Abstract: The electric motor control device includes: an inverter circuit 20 which converts DC power of a DC power supply 90 into AC power; and a switching control section 60 which performs on/off control of a semiconductor switching element composing the inverter circuit. The switching control section 60 includes: a power-supply-side abnormality determination section 62 which determines whether a power-supply-side abnormal state is established in which regenerative energy from an electric motor 10 cannot be regenerated to the DC power supply; and a switching frequency changeable section 63 which changes, when the power-supply-side abnormality determination section has determined that the power-supply-side abnormal state has been established, a switching frequency of the semiconductor switching element such that an overall loss, which is a total of loss in the inverter and loss in the electric motor, is increased.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: April 18, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventor: Ryo Shinohara
  • Patent number: 9601988
    Abstract: A power conversion apparatus includes a power converter to directly convert AC power having a frequency into AC power having a different frequency. A gate driver drives the power converter. A gate drive signal generator generates a gate drive signal supplied to the gate driver. Two cutoff devices are coupled between the gate driver and the gate drive signal generator, and supply or cut off the gate drive signal to the gate driver based on a command from an external apparatus. At least one of the two cutoff devices generates a feedback signal. An analyzer determines whether the one cutoff device has an abnormality based on the command and the feedback signal. A cutoff controller controls another one of the two cutoff devices to cut off the gate drive signal to the gate driver when the analyzer determines that the one cutoff device has the abnormality.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: March 21, 2017
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Shigenori Takayama, Satoshi Sueshima, Keisei Inoki
  • Patent number: 9571027
    Abstract: Provided are a power conversion device control device and a power conversion device control method, which are capable of reducing harm to other electronic devices and electromagnetic noise due to a switching frequency compared to the related art. Carrier change patterns of the respective phases, which are defined by parameters of an average switching frequency, a spectral diffusion index, and a repetition frequency, are generated so that at least the carrier change pattern of one phase differs from the carrier change patterns of the other phases. Semiconductor switching elements are controlled as instructed by duty command values while the switching frequency is switched for each phase separately, from one frequency to another sequentially based on carriers output in patterns that follow the generated carrier change patterns.
    Type: Grant
    Filed: July 7, 2015
    Date of Patent: February 14, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventor: Toru Miyake
  • Patent number: 9531313
    Abstract: In a control apparatus, an interference-reduction current calculator calculates, as an interference reduction current, a component of a current vector in a coordinate axis in a rotating coordinate system defined with respect to a rotor of the rotary machine. The current vector flows in the rotary machine, and the coordinate axis serves as an interference reduction coordinate axis in which the component of the current vector has reduced interference from change of the phase of the output voltage vector. An amplitude setter sets, as a manipulated variable for feedback controlling the interference reduction current to a command current value based on a command value for a controlled variable, one of: an amplitude of the output voltage vector, and an amplitude parameter indicative of a component of the output voltage vector. The component of the output voltage vector depends on the amplitude of the output voltage vector.
    Type: Grant
    Filed: May 19, 2015
    Date of Patent: December 27, 2016
    Assignee: DENSO CORPORATION
    Inventors: Yousuke Matsuki, Tomoya Takahashi
  • Patent number: 9525570
    Abstract: Current sensing circuitry for sensing a current through a load comprises an adaptive-resistance sensor component arranged to be operably coupled in series with the load, and control logic for controlling a resistance of the adaptive-resistance sensor component. The control logic is arranged to receive a signal representative of a voltage across the adaptive-resistance sensor component, compare the received signal to a reference value that is representative of a determined voltage, and in response to the comparison control the resistance of the adaptive-resistance sensor component, such that the voltage across the adaptive-resistance sensor component substantially tracks the determined voltage value.
    Type: Grant
    Filed: January 5, 2009
    Date of Patent: December 20, 2016
    Assignee: NXP USA, Inc.
    Inventor: Jerome Casters
  • Patent number: 9523566
    Abstract: Electric circuit for estimating the angular position of a rotor of an electric motor, including: a sensing module configured to receive at least one electric signal representative of a drive current of the electric motor and to generate a measurement signal indicative of a switching of the at least one electric signal and a switching index indicative of the type of switching, rising or falling, of the at least one electric signal; and a computing module configured to supply, from the measurement signal and switching index a position signal representative of an angular position of the electric motor rotor.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: December 20, 2016
    Assignee: STMICROELECTRONICS S.R.L.
    Inventors: Giuseppe D'Angelo, Giovanni Moselli, Virginia Clemente
  • Patent number: 9514904
    Abstract: Two magnetic poles of a permanent magnet of a permanent magnet switch and the two ends of an iron core wound with an excitation coil are connected to each other with the soft magnet having a salient pole. A motor uses the switch as the basic component of the stator and rotor, with two magnetic salient poles of each component being arranged axially, wherein the salient pole of the stator component and that of the rotor component are arranged in an opposite manner with an air gap, the excitation coil of the stator component and the rotor component at the symmetric axis position is taken as a phase line to access an excitation control power supply after serial connection or parallel connection. Electric excitation is carried out on the combined motor formed by shaft connection and rotation dislocation among single motors and the stator component in a bi-phase way simultaneously.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: December 6, 2016
    Assignee: DAI, SHANSHAN
    Inventors: Shanshan Dai, Xiaofeng Lu
  • Patent number: 9455652
    Abstract: If a bus current a bus current detector 11 detects exceeds a current cutoff value, an overcurrent detector 12 supplies a gate driver 14 with an open signal for turning off switching elements 5-10 to break the current to a motor 1. Besides, when the overcurrent detector 12 detects an overcurrent, a feedback controller 15 provides the gate driver 14 with a short-circuit braking instruction to apply short-circuit braking after breaking the power supply, and to restart PWM control from a state in which the short-circuit braking is being applied and the duty ratio command value is reset at 0.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: September 27, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tomohiro Ueno, Yoshitaka Onishi, Satoshi Kawamura, Shinsuke Takeshima
  • Patent number: 9423782
    Abstract: Motor drive device (30) according to the present invention includes operation pattern generator (1), position and speed controller (23), load characteristic compensator (24), and load characteristic measurement unit (7). Operation pattern generator (1) increases an absolute value of acceleration, at which a motor speed or a motor position is changed, in each operation pattern. Load characteristic measurement unit (7) measures the load characteristic to set load characteristic compensator (24) when torque command indicator is less than or equal to a torque limit value. Load characteristic measurement unit (7) ends the measurement of the load characteristic without setting load characteristic compensator (24) when the torque command indicator is greater than the torque limit value.
    Type: Grant
    Filed: April 9, 2014
    Date of Patent: August 23, 2016
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yu-suke Imada, Kenichi Suzuki, Masaru Nishizono, Hiroshi Fujiwara
  • Patent number: 9257920
    Abstract: A method of driving a permanent magnet synchronous electric motor includes sensing or estimating a back electromotive force induced in at least a winding of the motor by the rotation of a rotor of the motor; and reading, from a memory, values of a first voltage waveform having a phase angle with respect to the back electromotive force. The method also includes generating a driving voltage corresponding to the sum of values of a control voltage, obtained as product of the values of the first voltage waveform by a first coefficient determined as a function of a desired value of motor torque, and values of a cancelation voltage of the back electromotive force. The method also includes applying the driving voltage at the motor winding.
    Type: Grant
    Filed: July 9, 2014
    Date of Patent: February 9, 2016
    Assignee: STMICROELECTRONICS S.R.L.
    Inventors: Michele Berto Boscolo, Federico Magni, Paolo Pascale, Ezio Galbiati
  • Patent number: 9252700
    Abstract: A motor controller that controls energization of a motor in which a plurality of coils U1 to W2 that applies torque to a rotor is arranged in a circular pattern includes: a rotation speed detection sensor that detects a rotation speed of the motor; and an energization control unit that controls energization of the plurality of coils U1 to W2 using the detected rotation speed. The energization control unit sequentially energizes the plurality of coils U1 to W2 in all energization patterns if the detected rotation speed is outside of predetermined conditions and sequentially energizes the plurality of coils U1 to W2 in remaining energization patterns (for example, U?V phase, V?W phase, V?U phase, W?U phase, and W?V phase) excluding a partial energization pattern (for example, U?W phase) of all energization patterns if the detected rotation speed is within the predetermined conditions.
    Type: Grant
    Filed: June 21, 2013
    Date of Patent: February 2, 2016
    Assignee: SANYO DENKI CO., LTD.
    Inventor: Takahisa Toda
  • Patent number: 9231508
    Abstract: A motor driver apparatus that is formed of a semiconductor integrated circuit which is supplied with an electric power and drives a direct current motor includes a signal generating part that generates an indication signal for indicating a back electromotive force generation period while the direct current motor generates a back electromotive force, a removing part that detects a voltage variation generated in a power-supply voltage by the back electromotive force generated by the direct-current motor during the back electromotive force generation period indicated by the indication signal, and removes the detected voltage variation, and a limiting part that limits the power-supply voltage so as to be less than a predetermined voltage at a speed higher than that in the removing part.
    Type: Grant
    Filed: April 7, 2014
    Date of Patent: January 5, 2016
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventors: Atsushi Muramatsu, Tomomitsu Ohara
  • Patent number: 9209726
    Abstract: The invention relates to a method wherein the speed of the rotor of an electronically commutated synchronous machine is determined or controlled by means of one or more rotor position sensors, in particular, three rotor position sensors that are fixed to the stator, and a time measuring device, wherein the angle traveled by the rotor and the time lapsed during the travel are measured, wherein the measured angle traveled by the rotor is corrected by means of one or more first correction constants, in particular a differential for correcting for the influence of non-uniform positioning or expansion of the position marking of the rotor, and a circuit configuration for actuating an electronically commutated synchronous machine.
    Type: Grant
    Filed: November 21, 2011
    Date of Patent: December 8, 2015
    Assignee: CONTINENTAL TEVES AG & CO. OHG
    Inventors: Tom Kaufmann, Thomas Pröger, Jochen Leideck, Jan Statzner, Christian Bitsch, Peter Stauder
  • Patent number: 9054613
    Abstract: A motor drive apparatus drives a motor generator using electric power provided from a DC power supply. The motor generator rotates a rotor provided with a permanent magnet using a current magnetic field generated by passing a drive current through a coil of a stator. The motor drive apparatus includes an inverter configured to convert DC electric power provided from the DC power supply into AC electric power for driving the motor generator. An ECU of the motor drive apparatus controls the inverter such that an offset current is superimposed on at least one phase of the coil of the stator and a temperature of the permanent magnet provided at the rotor is raised.
    Type: Grant
    Filed: June 25, 2010
    Date of Patent: June 9, 2015
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Hideto Hanada
  • Publication number: 20150130378
    Abstract: The present disclosure provides a device and a method for driving a motor that demonstrates low noise and/or low vibration. A pulse-modulated control pulse signal S2 is generated by a driving signal generation portion 310 at each phase. A driving voltage VU˜VW, with duty cycle corresponding to the control pulse signal S2 and being inserted with specific idle time is applied to coils LU˜LW at each phase. A current phase detection signal S3 indicating a phase of the current IL flowing through the coil LU is generated by the current phase detection portion 330 at a specific phase (the phase U) corresponding to the control pulse signal S2 according to a pulse width of a terminal voltage VU at one end of the coil LU of the phase U.
    Type: Application
    Filed: November 7, 2014
    Publication date: May 14, 2015
    Inventor: KENJI SUGIURA
  • Patent number: 9030137
    Abstract: A drive system, for a multi-phase brushless electric motor comprising a plurality of phases, comprises: a drive circuit including switch means arranged to vary the phase voltage applied to each of the phases so as to switch the motor between a plurality of active states; and control means. The control means is arranged to control the switch means so as to provide PWM control of the phase voltages to control the mechanical output of the motor. The control means is arranged to define a sequence for all of the active states and, for each PWM period, to allocate state times for the states required for that period to generate a desired net voltage, and to order the required states in the same order as they occur in the sequence.
    Type: Grant
    Filed: February 15, 2011
    Date of Patent: May 12, 2015
    Assignee: TRW Limited
    Inventors: Connel Brett Williams, Christopher David Dixon, Robert James Huxford
  • Patent number: 9030138
    Abstract: A circuit configuration for driving an electric motor includes a signal evaluation module, which stores a number of output patterns. An input pattern is specified, and as a function of the input pattern, one of the output patterns is output, by which the electric motor is driven.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: May 12, 2015
    Assignee: Robert Bosch GmbH
    Inventors: Thomas Wagner, Dieter Thoss, Andreas Merker
  • Patent number: 9024562
    Abstract: A motor constant calculating method for a PM motor according to the present invention includes a voltage applying step of applying an applied voltage including a DC component and a plurality of frequency components to a PM motor, a motor current detecting step of detecting a motor current flowing depending on the applied voltage applied in the voltage applying step, and a motor constant calculating step of calculating a motor constant of the PM motor based on the applied voltage and the motor current.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: May 5, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Toru Tazawa, Masaru Nishizono
  • Patent number: 9018871
    Abstract: A carrier generating unit applies a carrier that monotonically decreases to a switching control unit during either one of a first period that is a period immediately following a period in which a voltage command value is a value not more than a minimum value of the carrier, the voltage command value taking a first predetermined value larger than the minimum value of the carrier in the first period, and a second period that is a period immediately preceding a period in which the voltage command value is not less than a maximum value of the carrier, the voltage command value taking a second predetermined value smaller than the maximum value in the second period.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: April 28, 2015
    Assignee: Daikin Industries, Ltd.
    Inventors: Takeshi Ashida, Hiroshi Hibino, Naoto Kobayashi, Michihiro Nakagawa, Nobuki Kitano, Masaki Kouno
  • Patent number: 9000697
    Abstract: The present invention provides a method for driving a three-phase motor with a driver. The driver can provide a pulse-width modulated driving signal and a linear driving signal. The three-phase motor has a first leg, a second leg and a third leg. The method includes: connecting the second leg to the driver; floating the third leg; driving the second leg with the pulse-width-modulated driving signal from the driver; estimating a time when a voltage in the third leg will reach a predetermined threshold; and driving the second leg with the linear driving signal during that time.
    Type: Grant
    Filed: August 30, 2011
    Date of Patent: April 7, 2015
    Assignee: Texas Instruments Incorporated
    Inventor: Gregory Swize
  • Patent number: 8994306
    Abstract: The system and method disclose for the controlling of sequential phase switching in driving a set of stator windings of a multi-phase sensorless brushless permanent magnet DC motor. A motor controller controls a power stage that drives two windings of a set of three windings in the motor with pulse width modulated signal. A plurality of voltage values on an undriven winding of the set of three windings are sampled within a window of time, wherein a period beginning when the driven windings are energized and ending when the driven windings are de-energized encompasses the window of time. The sampled voltage values are processed. When the processed voltage values exceed a threshold, the motor controller changes which two windings are driven.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: March 31, 2015
    Assignee: Cirrus Logic, Inc.
    Inventors: Marc John Kobayashi, Jason William Lawrence, Stephen James Sanchez, John L. Melanson, Miroslav Olijaca
  • Patent number: 8994309
    Abstract: There are provided a pulse width modulation (PWM) signal generating circuit and a motor driving circuit. The PWM signal generating circuit includes: a proportional-to-absolute temperature (PTAT) voltage generating unit generating a PTAT voltage in proportion to an absolute temperature; a reference wave signal generating unit generating a preset reference wave signal; and a PWM signal generating unit comparing the PTAT voltage and the reference wave signal with each other to generate a PWM signal, wherein the PTAT voltage generating unit adjusts the PTAT voltage according to a control signal.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: March 31, 2015
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Soo Woong Lee
  • Publication number: 20150084558
    Abstract: A method and apparatus for controlling an electric motor. A controller is configured to identify a start time for a signal based on a back electromotive force present in an electric motor during operation of the electric motor. The start time is for a position of a rotor relative to a group of coils. The controller is further configured to send the signal to the group of coils using the start time identified. An effect of the back electromotive force on the signal is reduced.
    Type: Application
    Filed: September 26, 2013
    Publication date: March 26, 2015
    Applicant: THE BOEING COMPANY
    Inventors: Christopher Pete Benson, Douglas C. Cameron
  • Publication number: 20150084559
    Abstract: A motor driving device includes a clock oscillator configured to generate a clock signal; and a logic unit configured to receive the clock signal, control conduction of a 3-phase brushless direct current (DC) motor, and generate a revolutions per minute (RPM) detection signal. The clock oscillator is configured to switch an oscillation frequency of the clock signal depending on an RPM command signal input to set a target RPM of the 3-phase brushless DC motor.
    Type: Application
    Filed: September 19, 2014
    Publication date: March 26, 2015
    Inventor: Shigeru Hirata
  • Patent number: 8988026
    Abstract: Single-phase voltage operation techniques are provided for a three-phase drive system. A drive system may include a rectifier configured to couple to a three-phase AC voltage source. The rectifier may be configured to convert AC voltage from the three-phase AC voltage source to a direct current (DC) voltage. The drive system may also include a controller configured to send a plurality of switching signals to a plurality of switches in the rectifier such that the plurality of switching signals minimizes a current provided to the rectifier when only a single-phase of the three-phase AC voltage source is available.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: March 24, 2015
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Ahmed Mohamed Sayed Ahmed, Lixiang Wei, Brian J. Seibel
  • Publication number: 20150075195
    Abstract: A motor control device includes a PWM signal generation unit generating a signal pattern of two of three phases so that the pattern follows a rotor position, and a timing adjusting unit. The signal generation unit increases/decreases duty in both directions of lag side and lead side based on any phase of a carrier-wave period regarding a first phase. The signal generation unit increases/decreases duty in one direction regarding a second phase. The signal generation unit increases/decreases duty in a direction opposite to the second phase regarding a third phase. The timing adjusting unit adjusts detection timing so that a current detection unit detects current in fixed timing with respect to one phase and current in another fixed timing with respect to the other phase or the current detection unit is capable of detecting current in variable timing according to magnitude of output voltage to an inverter circuit.
    Type: Application
    Filed: August 28, 2014
    Publication date: March 19, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventor: Nobuyuki SUZUKI