Electrical Noise Attenuation (e.g., Emi, Emr, Rfi, Etc.) Patents (Class 318/400.24)
  • Patent number: 10394217
    Abstract: To provide a motor driving apparatus capable of obtaining high detection resolution irrespective of whether a frequency of a signal from a detector is high or low. A motor driving apparatus for driving a motor includes an amplifier circuit for receiving a signal from a detector for outputting information including a position and a speed of the motor as the signal, and amplifying the received signal with a set amplification factor, a frequency detecting part for detecting a frequency of the signal, and an amplification factor setting part for changing setting of the amplification factor of the amplifier circuit according to the frequency detected by the frequency detecting part.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: August 27, 2019
    Assignee: FANUC CORPORATION
    Inventors: Kunio Tsuchida, Taku Sasaki, Nobuo Hirayama
  • Patent number: 10389257
    Abstract: A voltage converter is disclosed to include a high-side switch circuit block comprising a plurality of high-side switching elements and a low-side switch circuit block comprising a plurality of low-side switching elements. The voltage converter may include an intermediate node coupled to one or more high-side switching elements and coupled to one or more low-side switching elements. The voltage converter may further include a segmentation circuit block communicatively coupled to the high-side switch circuit block and communicatively coupled to the low-side switch circuit block.
    Type: Grant
    Filed: October 23, 2017
    Date of Patent: August 20, 2019
    Assignee: Skyworks Solutions, Inc.
    Inventors: Wendy Ng, James Jason Locascio
  • Patent number: 9816743
    Abstract: An electric motor drive device including a drive controller configured to control an operation of an inverter, the drive controller including a frequency setting unit configured to set an operating frequency of an electric motor, a frequency determining unit configured to determine whether or not the operating frequency set in the frequency setting unit is equal to or lower than a set frequency threshold value, a voltage determining unit configured to determine whether or not a value of a DC voltage is equal to or larger than a set voltage threshold value, and an inverter controller configured to control the inverter based on the operating frequency set in the frequency setting unit.
    Type: Grant
    Filed: August 22, 2014
    Date of Patent: November 14, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shusaku Nakase, Shigeo Takata
  • Patent number: 9722565
    Abstract: A filter component includes a housing body. A first and at least one second busbar each have a first end section, and a second end section, between which in each case a center section is arranged. The end sections of the busbars each have connections for connecting electrical conductors to the filter component. The first and second end section and the center section of the first busbar are arranged in a first plane and the first and second end section and the center section of the at least one second busbar are arranged in a second plane, which is different from the first plane.
    Type: Grant
    Filed: February 3, 2014
    Date of Patent: August 1, 2017
    Assignee: EPCOS AG
    Inventor: Fabian Beck
  • Patent number: 9434388
    Abstract: Methods and systems are provided for estimating a characteristic of a surface of a road on which a vehicle is travelling is provided. The system comprises a sensor and a processor. The sensor is configured to measure information pertaining to a wheel slip for one or more wheels of the vehicle after a torque is applied. The processor is coupled to the sensor, and is configured to at least facilitate applying the torque for the one or more wheels of the vehicle, and estimating the characteristic of the surface of the road based at least in part on the wheel slip after the torque is applied and the torque.
    Type: Grant
    Filed: October 31, 2014
    Date of Patent: September 6, 2016
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Fred W. Huntzicker, Paul R. Williams, Daniel R. Gee
  • Patent number: 9178454
    Abstract: A control apparatus controlling a rotating machine includes a signal output unit that outputs an excitation signal to a resolver used for detecting a rotational angle of the rotating machine; a demodulation unit that demodulate a signal related to the rotational angle based on a detection of a modulated signal and the excitation signal so as to output a demodulated signal; a filter that eliminates higher harmonics in the demodulated signal outputted by the demodulation unit so as to output a calculated angle of the rotational angle; and an operating unit that controls a switching element included in a DC-AC conversion circuit to be ON and OFF based on the calculated angle of the rotational angle outputted by the filter, so as to control the rotating machine with an output voltage of the DC-AC conversion circuit supplied to the rotating machine.
    Type: Grant
    Filed: June 2, 2014
    Date of Patent: November 3, 2015
    Assignee: DENSO CORPORATION
    Inventors: Jyunji Miyachi, Tsuneo Maebara
  • Patent number: 8963454
    Abstract: An apparatus for controlling a compressor is provided. When grounding the apparatus for controlling a compressor, an analog circuit ground and a digital circuit ground may be insulated from each other to protect the apparatus. A ground of an analog circuit driven by commercial alternating current (AC) power, and a ground of a digital circuit driven by a voltage which has been converted from commercial AC power, may also be insulated from each other by a simple circuit device to protect a controller inside the digital circuit.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: February 24, 2015
    Assignee: LG Electronics Inc.
    Inventors: Jaeyoo Yoo, Boram Lee
  • Publication number: 20140375240
    Abstract: In an electric compressor for a vehicle, a sensor is provided between a filter circuit and a negative terminal of the electric motor that is connected to an in-vehicle power source. An inverter includes a controller which is configured to check the frequency of the ripple component of the input current to the inverter based on the current measured by the current sensor and variably sets the carrier frequency of the inverter so as not to coincide with the checked frequency.
    Type: Application
    Filed: June 16, 2014
    Publication date: December 25, 2014
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Takashi KAWASHIMA, Yoshiki NAGATA, Takuya NARUSE
  • Patent number: 8917042
    Abstract: A drive circuit is provided for reducing conducted electromagnetic interference provided by a power line to a motor controller. The power line includes a first alternating current (AC) line output and a second AC line output. The drive circuit includes an EMI filter having a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The first input terminal is configured to be coupled to the first AC line output and the second input terminal is configured to be coupled to the second AC line output. The drive circuit further includes at least two series-coupled filter capacitors positioned after the EMI filter and a power factor correction (PFC) choke. The PFC choke is coupled at a first end to the second output terminal and at a second end between the series-coupled filter capacitors.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: December 23, 2014
    Assignee: Regal Beloit America, Inc.
    Inventors: Roger Carlos Becerra, Yao Da
  • Patent number: 8912742
    Abstract: An ECU executes a program including a step of detecting the rotation speed of a motor, a step of determining the diffusion width of carrier frequency, a step of determining the carrier frequency based on the determined diffusion width, a step of generating a carrier signal based on the determined carrier frequency, and a step of executing pulse width modulation based on an AC voltage command and the carrier signal.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: December 16, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Ryosuke Ohsugi
  • Patent number: 8907604
    Abstract: An optimized pseudo-random period pattern can reduce audible noise in a system that includes an inverter circuit configured to provide power to an electric machine. A system can include a PWM optimization module (POM) comprising the PPP. A carrier period for a carrier signal used to provide PWM inverter drive signals can be selected in accordance with the PPP. The PPP can be expressed as an array of 200-400 elements, each element a period belonging to a finite set of 2 or more predetermined periods. A period can be selected by index from the array, and the index incremented to progress through the PPP, which can be repeated upon its completion. The PPP can be optimized to reduce audible noise while mitigating inverter losses. Modeling techniques can determine the number of array elements, the number of possible periods, and the period values that optimize the PPP.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: December 9, 2014
    Assignee: Ford Global Technologies, LLC
    Inventors: Jami J. Miller, Michael W. Degner, Scott Xiong Yu, William C. Reynolds
  • Patent number: 8866435
    Abstract: A control device controls an inverter controlling an output of a motor by PWM control. The control device calculates a reference frequency based on a torque and a rotation speed of the motor, calculates a random coefficient using two data tables, and calculates, as a random frequency, a value obtained by adding, to a reference frequency, a value obtained by multiplying a prescribed width by the random coefficient. The control device calculates control limit lines based on the rotation speed of the motor, and corrects the random frequency so as to fall within a range that is higher than the control limit line and lower than the control limit line. The control device generates a carrier signal having a random frequency as a carrier frequency.
    Type: Grant
    Filed: June 7, 2010
    Date of Patent: October 21, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masayoshi Suhama, Kenji Yamada, Tetsuhiro Itoh, Satoru Katoh
  • Publication number: 20140300304
    Abstract: In an electric power steering driving unit provided with an electric motor that outputs auxiliary torque to a handwheel of a vehicle, a control apparatus having semiconductor switching devices that each control a current to the electric motor, and a noise filter that prevents noise, produced when the semiconductor switching devices each control a current to the electric motor, from being emitted, the noise filter is configured with a plurality of coils, capacitors that make pairs with the respective corresponding coils, and a bus bar that performs connections among the coils and the capacitors, and part of or all of the noise filter is configured as a structural member that is different from the control apparatus.
    Type: Application
    Filed: March 6, 2012
    Publication date: October 9, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Katsuhiko Omae, Kohei Ushio
  • Patent number: 8796969
    Abstract: An switch array for use in a motor control circuit with a power source, controller and a motor includes a plurality of bidirectional switches positioned between the power source and the motor, wherein the bidirectional switches are PWM controlled by high speed control signals from the controller to provide power from the power source to the motor as desired, wherein the switch array is positioned substantially adjacent to the motor. The power source may be a three phase AC power source. The switches are preferably bidirectional gallium nitride (GaN) switches.
    Type: Grant
    Filed: January 25, 2007
    Date of Patent: August 5, 2014
    Assignee: International Rectifier Corporation
    Inventor: Jay Goetz
  • Patent number: 8754602
    Abstract: An embodiment of a motor controller includes a motor driver and a signal conditioner. The motor driver is configured to generate a motor-coil drive signal having a first component at a first frequency, and the signal conditioner is coupled to the motor driver and is configured to alter the first component. For example, if the first component of the motor-coil drive signal causes the motor to audibly vibrate (e.g., “whine”), then the signal conditioner may alter the amplitude or phase of the first component to reduce the vibration noise to below a threshold level.
    Type: Grant
    Filed: September 2, 2009
    Date of Patent: June 17, 2014
    Assignees: STMicroelectronics, Inc., STMicrolectronics S.r.l.
    Inventors: Frederic Bonvin, Ezio Galbiati
  • Patent number: 8742709
    Abstract: Provided is an integrated-inverter electric compressor with suppressed self-noise interference in an inverter unit, simplified electrical connections between an inverter circuit and a filter circuit, and fewer welded positions. A housing (2) has, on the periphery thereof, an inverter box (5) accommodating the inverter circuit (21) and a junction box (6) communicating with the inverter box (5) and accommodating a plurality of high-voltage components constituting a noise-suppression filter circuit (27). The plurality of high-voltage components accommodated in the junction box (6) are electrically connected via a busbar (33). The busbar (33) includes branched busbars (34) branched off near connections with a high-voltage component installed close to the inverter circuit (21), and the branched busbars (34) are connected to P-N terminals (25) of the inverter circuit (21) in a communicating section (12) between the junction box (6) and the inverter box (5).
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: June 3, 2014
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Takayuki Watanabe, Takeshi Hirano
  • Patent number: 8674635
    Abstract: A noise reduction device for a starter includes a positive electrode connected to a power supply line via a branch wire, a grounding electrode connected to ground via a motor body of a motor, two capacitors connected in parallel with each other between the positive electrode and the grounding electrode, and a resin package into which the positive electrode and the grounding electrode are inserted and fixed. The package holds the two capacitors. The two capacitors include a capacitor body and two lead terminals extracted from the capacitor body in the same direction with respect to the capacitor body. The two capacitors are arranged in such a direction that the lead terminals of one thereof face the lead terminals of the other thereof across the positive electrode and the grounding electrode. The two lead terminals are joined to the positive electrode and the grounding electrode by welding.
    Type: Grant
    Filed: May 29, 2012
    Date of Patent: March 18, 2014
    Assignee: Denso Corporation
    Inventor: Yoichi Shoji
  • Patent number: 8674636
    Abstract: A power conversion device for a vehicle includes: a power module that includes a switching device and, upon operation of the switching device, converts DC power into AC power to be supplied to an electric machine for driving a vehicle; a capacitor module that includes a smoothing capacitor element, an input-side power source terminal for receiving DC power, and an output-side power source terminal for supplying DC power to the power module; and a noise removal capacitor for removing noise, wherein: the noise removal capacitor is built in the capacitor module, and the noise removal capacitor is electrically connected to the input-side power source terminal in a position where a distance between a connection position of the noise removal capacitor and the input-side power source terminal is less than a distance between a connection position of the noise removal capacitor and the output-side power source terminal of the capacitor module.
    Type: Grant
    Filed: October 26, 2009
    Date of Patent: March 18, 2014
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Takeshi Matsuo, Kinya Nakatsu, Toshiya Satoh, Ken Maeda
  • Publication number: 20140070744
    Abstract: A drive circuit is provided for reducing conducted electromagnetic interference provided by a power line to a motor controller. The power line includes a first alternating current (AC) line output and a second AC line output. The drive circuit includes an EMI filter having a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The first input terminal is configured to be coupled to the first AC line output and the second input terminal is configured to be coupled to the second AC line output. The drive circuit further includes at least two series-coupled filter capacitors positioned after the EMI filter and a power factor correction (PFC) choke. The PFC choke is coupled at a first end to the second output terminal and at a second end between the series-coupled filter capacitors.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Inventors: Roger Carlos Becerra, Yao Da
  • Patent number: 8598833
    Abstract: An electronically commutated motor (ECM) includes windings, a power switch, an infrared transceiver and an electromagnetic shield. The power switch is configured to provide pulse width modulated (PWM) power signals to the windings and to generate a substantial level of electromagnetic noises at PWM frequencies during its switching operation. The infrared transceiver is configured to communicate with an external device using infrared signals and convert electrical signals from and to infrared signals that carry data. The electromagnetic shield is configured to substantially shield the infrared transceiver from the electromagnetic noises of PWM frequencies from the power switch.
    Type: Grant
    Filed: December 13, 2010
    Date of Patent: December 3, 2013
    Assignee: Sntech Inc.
    Inventor: Young Chun Jeung
  • Publication number: 20130293168
    Abstract: An electrical supply line for operating a first electric motor includes a first converter for supplying electric energy to the first electric motor in dependence of a first control variable, a connected network connecting the first converter to a DC voltage source, an oscillation suppression controller for generating first correction information, and a first correction module for generating the first control variable by taking into consideration an operating parameter of the first electric motor and by taking into consideration the first correction information. An electrical supply system includes two of the supply lines. A corresponding method for operating an electric drive is also described.
    Type: Application
    Filed: May 1, 2013
    Publication date: November 7, 2013
    Applicant: Siemens Aktiengesellschaft
    Inventors: Georg Bachmaier, Christian Bachmann, Dominik Bergmann, Matthias Gerlich, Andreas Gödecke, Guillaume Pais
  • Patent number: 8541972
    Abstract: Disclosed is a method for suppressing a speed ripple occurring during an operation of an AC motor by using a torque compensator based on an activation function. The method includes the steps of calculating a speed error ?err based on a reference speed ?ref and an actual speed ?act; calculating a controller output Trm by using the speed error ?err as an input of a PI control and an operation of a compensated torque Tcom; and determining a torque variation based on the controller output Trm and a reference torque Tref and operating the torque variation in relation to an anti-windup gain Ka to use torque variation as an input of an integral (I) control. The method suppresses the speed ripple by compensating for the torque ripple through a controller which calculates the compensated torque by taking the signs of the speed error and the differential speed error into consideration.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: September 24, 2013
    Assignee: Kyungsung University Industry Cooperation Foundation
    Inventors: Dong Hee Lee, Jin Woo Ahn
  • Patent number: 8531142
    Abstract: A bi-power motor controlling apparatus, which is electrically connected with a motor, includes a driver IC having a first pin and a second pin. The first and second pins are used to receive a first power and a second power, respectively, from outside. The second power is supplied to the driver IC, and the first power is supplied to the motor for controlling the rotational speed of the motor.
    Type: Grant
    Filed: May 3, 2010
    Date of Patent: September 10, 2013
    Assignee: Delta Electronics, Inc.
    Inventors: Ming-Lung Liu, Chun-Chia Lu, Chia-Feng Wu, Chun-Lung Chiu
  • Publication number: 20130207583
    Abstract: A voltage output circuit includes: an oscillator circuit configured to output an oscillation signal while changing an oscillation frequency thereof; and a voltage generating circuit configured to convert a first voltage into a second voltage higher than the first voltage, and output the second voltage, based on the oscillation signal.
    Type: Application
    Filed: February 13, 2013
    Publication date: August 15, 2013
    Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Yasuyuki Takamori, Shinobu Shioda
  • Patent number: 8497647
    Abstract: A control system and method for a multi-phase motor substantially reduces or eliminates jitter resulting from. drive mismatch by replacing a conventional trapezoidal drive profile with a drive profile that causes the voltage applied across active phases of the motor to match the back-EMF across those phases. In an ideal motor, the back-EMF is substantially sinusoidal, and although the drive profile applied to each phase is not truly substantially sinusoidal, the drive voltage across the active phases is substantially sinusoidal. In a non-ideal motor, the back-EMF is not truly sinusoidal and the drive profiles applied to each phase are calculated to cause the drive voltage across the active phases to match the back-EMF across those phases.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: July 30, 2013
    Assignee: Marvell International Ltd.
    Inventors: Ravishanker Krishnamoorthy, Foo Leng Leong
  • Publication number: 20130169206
    Abstract: A control device controls an inverter controlling an output of a motor by PWM control. The control device calculates a reference frequency based on a torque and a rotation speed of the motor, calculates a random coefficient using two data tables, and calculates, as a random frequency, a value obtained by adding, to a reference frequency, a value obtained by multiplying a prescribed width by the random coefficient. The control device calculates control limit lines based on the rotation speed of the motor, and corrects the random frequency so as to fall within a range that is higher than the control limit line and lower than the control limit line. The control device generates a carrier signal having a random frequency as a carrier frequency.
    Type: Application
    Filed: June 7, 2010
    Publication date: July 4, 2013
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masayoshi Suhama, Kenji Yamada, Tetsuhiro Itoh, Satoru Katoh
  • Patent number: 8319462
    Abstract: Provided are an output filter and a power conversion apparatus having such an output filter. The output filter is configured by a neutral point detector with a reduced size and having no common mode inductance occurring by making inductances in coils of respective phases equal.
    Type: Grant
    Filed: July 11, 2011
    Date of Patent: November 27, 2012
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Aiko Inuduka, Tsuyoshi Higuchi
  • Patent number: 8314581
    Abstract: A control system and method for a multi-phase motor substantially reduces or eliminates jitter resulting from drive mismatch by replacing a conventional trapezoidal drive profile with a drive profile that causes the voltage applied across active phases of the motor to match the back-EMF across those phases. In an ideal motor, the back-EMF is substantially sinusoidal, and although the drive profile applied to each phase is not truly substantially sinusoidal, the drive voltage across the active phases is substantially sinusoidal. In a non-ideal motor, the back-EMF is not truly sinusoidal and the drive profiles applied to each phase are calculated to cause the drive voltage across the active phases to match the back-EMF across those phases.
    Type: Grant
    Filed: December 10, 2010
    Date of Patent: November 20, 2012
    Assignee: Marvell International Ltd.
    Inventors: Ravishanker Krishnamoorthy, Foo Leng Leong
  • Patent number: 8310190
    Abstract: An apparatus and a method for detecting a lock error in a sensorless motor are disclosed, where the apparatus includes a multiplexer, a negative booster, a comparator and a timer. The multiplexer can receive a coil voltage from the sensorless motor. The negative booster can receive a neutralizing voltage from the sensorless motor and drop the neutralizing voltage. The comparator can compare the coil voltage with the dropped neutralizing voltage for outputting a zero-crossing signal. The timer can count time duration during the zero-crossing signal maintained at the a logic level and determine the lock error in the sensorless motor when the time duration exceeds a predetermined period.
    Type: Grant
    Filed: July 26, 2010
    Date of Patent: November 13, 2012
    Assignee: inergy Technology Inc.
    Inventor: Hsien-Wen Hsu
  • Publication number: 20120274251
    Abstract: The present invention relates to a method for regulating a set of first noise harmonics from an electronic device operatively connected to a power supply unit, the method comprising the step of injecting a second set of harmonics into a representation of a drive current provided to the electronic device in order to regulate at least part of the noise harmonics of the first set, wherein the harmonics of the second set is/are different from the noise harmonics of the first set. The invention further relates to a power supply unit for performing the method of the present invention.
    Type: Application
    Filed: April 29, 2011
    Publication date: November 1, 2012
    Applicant: Danfoss Drives A/S
    Inventor: Charles J. Romenesko
  • Patent number: 8217602
    Abstract: Provided is a motor driving apparatus including a motor drive unit including a plurality of transistors which are repeatedly turned on and off in response to a pulse having a pulse width modulated at a first carrier frequency to control driving of a motor in a normal operation state and which supply a drive current to the motor; and a control unit that controls the plurality of transistors to be turned on and off in response to a pulse having a pulse width modulated at a second carrier frequency higher than the first carrier frequency, when a voltage applied between input terminals of the motor drive unit rises to a predetermined value.
    Type: Grant
    Filed: July 7, 2009
    Date of Patent: July 10, 2012
    Assignee: Renesas Electronics Corporation
    Inventor: Satoshi Ikei
  • Patent number: 8207696
    Abstract: A system includes a speed control module, a repeatable component measuring module, and a repeatable component correcting module. The speed control module controls a speed of a motor based on an error signal generated based on a desired speed and back electromotive force. The error signal includes a repeatable component of noise. The repeatable component measuring module measures the repeatable component. The repeatable component correcting module corrects the repeatable component based on transfer characteristics of the speed control module and the motor and generates a corrected repeatable component.
    Type: Grant
    Filed: January 23, 2009
    Date of Patent: June 26, 2012
    Assignee: Marvell International Ltd.
    Inventor: Kiyotada Ito
  • Patent number: 8198853
    Abstract: A motor speed controller and a method of controller a speed of a motor are provided. The system and method include a motor and a motor controller that monitors operation of the motor based on electromotive force (EMF) conditions of the motor. The motor controller cuts a voltage to the motor, measures an electromotive force (EMF) of the motor at a predetermined time after the cutting of the voltage to the motor, and compares the measured electromotive force (EMF) to a table.
    Type: Grant
    Filed: October 9, 2008
    Date of Patent: June 12, 2012
    Assignee: BSH Home Appliances Corporation
    Inventor: George Savitz
  • Patent number: 8169172
    Abstract: A variable speed drive for an electric motor has an inverter for receiving pulse width modulation controls. The inverter communicates power signals to a poly-phase electrical motor. A resolver communicates signals from the poly-phase motor back to a motor control. The motor control includes a speed control, a field-oriented control, and a pulse width modulation drive for driving the inverter. The resolver is connected to the speed control and to the field-oriented control, and further communicates with a synchronous compensator. The synchronous compensator is configured to drive the harmonic content at a target frequency or frequencies in a selected signal towards zero over time.
    Type: Grant
    Filed: May 3, 2010
    Date of Patent: May 1, 2012
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Albert L. Markunas, James J. Wrobel
  • Patent number: 8076882
    Abstract: A method and apparatus is disclosed for controlling a system comprising at least one electric motor. The motor drive circuit includes a reconfigurable active snubber. Under given resonance conditions, the active snubber is configured to use a resistive element to dissipate electrical transients across the commutation circuit.
    Type: Grant
    Filed: December 26, 2007
    Date of Patent: December 13, 2011
    Assignees: Pratt & Whitney Canada Corp., Hamilton Sundstrand Corporation
    Inventors: Kevin A. Dooley, Gregory I. Rozman
  • Patent number: 8058828
    Abstract: A compensating system for compensating a cogging torque of a motor includes a speed measuring apparatus, a moment of inertia measuring apparatus, a rotor position sensor, a processor, a plurality of band-pass filters, and a current control apparatus. The processor receives a speed, a moment of inertia, and a rotor position of the motor, to determine the cogging torque of the motor. Each band-pass filter is arranged with a different frequency to filter different frequencies of waveforms of the cogging torque. The processor determines a Fourier transformation of the cogging torque according to a number of Fourier coefficients from the band-pass filters, a cogging torque at a preset rotor position, and a cogging current according to the Fourier transformation of the cogging torque. The current control apparatus outputs a current opposite to the cogging current, to compensate the cogging torque of the motor.
    Type: Grant
    Filed: April 2, 2009
    Date of Patent: November 15, 2011
    Assignee: Foxnum Technology Co., Ltd.
    Inventors: You-Ren Lin, Yaw-Shen Lai, Rong-Hwang Horng
  • Publication number: 20110266987
    Abstract: A variable speed drive for an electric motor has an inverter for receiving pulse width modulation controls. The inverter communicates power signals to a poly-phase electrical motor. A resolver communicates signals from the poly-phase motor back to a motor control. The motor control includes a speed control, a field-oriented control, and a pulse width modulation drive for driving the inverter. The resolver is connected to the speed control and to the field-oriented control, and further communicates with a synchronous compensator. The synchronous compensator is configured to drive the harmonic content at a target frequency or frequencies in a selected signal towards zero over time.
    Type: Application
    Filed: May 3, 2010
    Publication date: November 3, 2011
    Inventors: Albert L. Markunas, James J. Wrobel
  • Publication number: 20110163705
    Abstract: In an inverter in which noise reducing coils and a smoothing capacitor are provided on a power line to an inverter module to achieve a no-busbar configuration, simplification of the manufacturing process, reduction of the influence on the size of the inverter, enhanced noise reducing function, reduction in cost and so on, the smoothing capacitor is electrically connected, on the inverter module, to the power line in parallel with a power system board, and the noise reducing coils are connected to the power line by directly connecting output lead wires thereof to P-N terminals of the inverter module.
    Type: Application
    Filed: February 4, 2010
    Publication date: July 7, 2011
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Hidetaka Sato, Koji Nakano, Kazunori Teshima, Takashi Nakagami, Koji Toyama, Takeshi Hirano, Takayuki Watanabe, Naoto Kunieda
  • Patent number: 7969108
    Abstract: A control circuit (120, 140) for a brushless direct current (DC) motor (160) includes a current drive circuit (140), a current loop regulator (122), and a commutation loop regulator (124, 126). The current drive circuit (140) is adapted to drive the brushless DC motor (160) in a first polarity or a second polarity selectively in response to a control signal, and senses a current through the brushless DC motor (160) to provide a current sense signal. The current loop regulator (122) varies a duty cycle of the control signal to regulate the current in response to the current sense signal, and regulates the polarity of the current based on a state of a polarity signal. The commutation loop regulator (124, 126) regulates a transition of said polarity signal in response to a comparison of a pre-commutation duty cycle value and a post-commutation duty cycle value.
    Type: Grant
    Filed: December 3, 2008
    Date of Patent: June 28, 2011
    Assignee: Semiconductor Components Industries, LLC
    Inventor: Sam J. B. W. Vermeir
  • Publication number: 20110140644
    Abstract: An electronically commutated motor (ECM) includes windings, a power switch, an infrared transceiver and an electromagnetic shield. The power switch is configured to provide pulse width modulated (PWM) power signals to the windings and to generate a substantial level of electromagnetic noises at PWM frequencies during its switching operation. The infrared transceiver is configured to communicate with an external device using infrared signals and convert electrical signals from and to infrared signals that carry data. The electromagnetic shield is configured to substantially shield the infrared transceiver from the electromagnetic noises of PWM frequencies from the power switch.
    Type: Application
    Filed: December 13, 2010
    Publication date: June 16, 2011
    Applicant: SNTech INC.
    Inventor: Young Chun JEUNG
  • Patent number: 7952309
    Abstract: A rotating electrical machine control device includes an inverter; a resolver; a unit; a three-phase/two-phase modulation switching unit; and a motor control unit that switches to a two-phase modulation in a specific region where an electric noise given to the resolver by a rotating electrical machine is large, even in a region where the modulation ratio is smaller than the three-phase/two-phase modulation switching boundary.
    Type: Grant
    Filed: January 9, 2009
    Date of Patent: May 31, 2011
    Assignee: Aisin A W Co., Ltd.
    Inventors: Keisuke Nishimura, Masuho Sakakibara, Yoshinari Nakagawa, Yoshinori Oono
  • Patent number: 7902777
    Abstract: Method and system for motor oscillatory state detection. According to various embodiments, the present invention presents a method for determining whether a motor is in an oscillatory state. The method includes powering up a motor for a period of time and then monitoring the movement of the motor during a period after the power if turned off. Based on the movement of the motor and/or impeller during a time period after the power is turned off, whether the motor is in an oscillatory state is determined. The method also includes initiating a process for handle error if the motor is in the oscillation state.
    Type: Grant
    Filed: April 2, 2008
    Date of Patent: March 8, 2011
    Assignee: Minebea Co., Ltd.
    Inventors: Jerome Pierre, Nigel Strike, Eric A. Hardt
  • Patent number: 7868571
    Abstract: A motor system with reduced common-mode noise includes an AC power, a first transformer unit electrically connected to the AC power and providing a first DC power, and a second transformer unit electrically connected to the AC power and providing a second DC power. The first DC power is supplied to a motor driving section of the motor system, and the second DC power is supplied to a motor controlling section of the motor system. Therefore, a common-mode noise from the transformer winding for the motor driving section can be prevented from coupling to the transformer winding for the motor controlling section. Moreover, a safe stop signal is applied to turn down a PWM IC for power through a photo coupler or a relay. Therefore, the first transformer unit stops supplying current to the motor driving section of the motor system to enhance safe stop function for the motor system.
    Type: Grant
    Filed: January 30, 2008
    Date of Patent: January 11, 2011
    Assignee: Delta Electronics, Inc.
    Inventor: Shou-Min Lee
  • Patent number: 7855523
    Abstract: A back electromotive detection comparator compares back electromotive voltages Vu to Vw with a common voltage Vn of coils, and generates first rectangular wave signals Pu to Pw. A masking circuit performs masking of the first rectangular wave signals Pu to Pw, and outputs the resultant signals as second rectangular wave signals Mu to Mw. An output circuit supplies a drive current to coils on the basis of the second rectangular wave signals Mu to Mw. A frequency generating circuit generates a frequency generation signal SigFG whose level switches at every edge of the second rectangular wave signals Mu to Mw. A mask signal generating circuit generates a mask signal MSK which is at a high level during an interval multiplied by a coefficient to a pulse width Tp of the frequency generation signal SigFG after level transition of the frequency generation signal SigFG.
    Type: Grant
    Filed: June 19, 2006
    Date of Patent: December 21, 2010
    Assignee: Rohm Co., Ltd.
    Inventor: Makoto Kuwamura
  • Patent number: 7777992
    Abstract: Motor start circuit for an induction motor, particularly a single-phase AC induction motor, with a main winding (4) and an auxiliary winding (5), which are supplied with current, particularly alternating current, via current supply connections (24, 25), and with a start switching device (15) serving the purpose of interrupting the current flow through the auxiliary winding (5) after the start of the motor, the start switching device (15) being connected to a control device (20) via a connector (18), the control device (20) being connected between the current supply connections (24, 25), and with a winding protection switch (28), which is normally closed and which opens on the occurrence of a fault. The invention is characterized in that the control device (20) is connected to the winding protection switch (28) via at least one further connector (22, 17), preferably via at least one further connector (22, 17) and the auxiliary winding (5).
    Type: Grant
    Filed: November 6, 2007
    Date of Patent: August 17, 2010
    Assignee: Danfoss Compressors GmbH
    Inventors: Claus Schmidt, Hans Peter Kristensen
  • Patent number: 7778529
    Abstract: A method is proposed for supplying electrical power to a DC motor (16) which can be commutated electronically via a semiconductor power output stage (28), preferably a three-phase DC motor, through which a control unit (22) passes current in blocks, corresponding to the signals from a rotor position sensor (20). Current is passed through the motor (16) variably in steps, in such a manner that the magnitude and/or the duration and/or the trigger angle of the current blocks can be varied as a function of the rotation speed and/or of the load, with respect to the profile of the induced voltage (E).
    Type: Grant
    Filed: September 7, 2006
    Date of Patent: August 17, 2010
    Assignee: Robert Bosch GmbH
    Inventor: Torsten Wilharm
  • Patent number: 7777436
    Abstract: A system for controlling a trapezoidally (square wave) driven DC motor includes a unipolar commutation circuit coupled between a DC power supply and a brushless DC motor. The motor has three phases formed by respective stator windings coupled at respective proximal ends to a common node and having respective opposite ends remote from the common node. The commutation circuit drives the motor according to a commutation cycle including three primary steps. During each primary step, one of the phases is driven while the other two phases are not driven. Voltages at the remote ends of the undriven phases are sensed, and timing signals are generated at points where the voltages coincide. The timing signals are used to determine motor position and speed, and to synchronize the commutation cycle with motor position and speed. In one embodiment, the commutation cycle includes transitional steps between the primary steps for smoother operation.
    Type: Grant
    Filed: July 14, 2008
    Date of Patent: August 17, 2010
    Assignee: The Bergquist Torrington Company
    Inventors: Robert G. Brown, Ashit Kumar Das
  • Patent number: 7759887
    Abstract: A motor driving device includes an amplifying unit, a noise removing unit, an analog-to-digital converter, a calculating unit, and a motor driving unit. The amplifying unit amplifies an analog frequency signal corresponding to a rotation speed of a direct-current brushless motor. The noise removing unit removes noise from the analog frequency signal after amplification. The analog-to-digital converter converts the analog frequency signal from which noise is removed to a digital frequency signal. The calculating unit calculates a current control amount with respect to each phase of the direct-current brushless motor based on the digital frequency signal. The motor driving unit drives the direct-current brushless motor at a specified speed based on the current control amount.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: July 20, 2010
    Assignee: Ricoh Company, Ltd.
    Inventor: Koji Kiryu
  • Patent number: 7741798
    Abstract: An RFI/EMI filter for a variable frequency motor drive system includes a variable frequency drive; a common mode choke; a motor; a cable including a plurality of power leads interconnecting the motor with the variable frequency drive and passing through the choke; a ground shield surrounding the cable and connected to motor ground and variable frequency drive ground; and a common mode return conductor interconnected between the variable frequency drive and the motor and disposed within the shield and passing through the choke for returning a portion of the common mode current to cancel a portion of the saturation current experienced by the choke to increase the portion of the common mode current carried by the return conductor and decrease the portion carried by the shield to reduce the RFI/EMI contributed by the shield.
    Type: Grant
    Filed: November 16, 2007
    Date of Patent: June 22, 2010
    Assignee: Azure Dynamics, Inc.
    Inventor: Donald J. Lucas
  • Patent number: 7741799
    Abstract: A brushless DC motor drive circuit includes a drive unit and a transient current suppression circuit. The drive unit comprises a Hall component, a drive component, a first transistor and a second transistor. The Hall component detects the position of a rotor of the DC motor and transmits digital command signals to the drive component; the drive component further generates two complementary digital command signals; and the first and second transistors connect with the drive component respectively. The transient current suppression circuit comprises a first auxiliary transistor and a second auxiliary transistor, wherein the first auxiliary transistor receives one of the complementary digital command signals different from the other one received by the first transistor and the second auxiliary transistor receives the other one of the complementary digital command signals different from the one received by the second transistor.
    Type: Grant
    Filed: July 12, 2007
    Date of Patent: June 22, 2010
    Assignee: Sunonwealth Electric Machine Industry Co., Ltd
    Inventors: Alex Horng, Chung-Ken Cheng, Shih-Chang Hsu