Nonmagnetic Motor Patents (Class 318/116)
  • Patent number: 10881027
    Abstract: A socket includes a housing configured to receive a removable Data Storage Device (DSD) and a Thermal Interface Material (TIM). An assembly of the socket is attached to the housing and configured to expand due to heat. In a thermally expanded state, the assembly causes the TIM to come into contact with the removable DSD to draw heat away from the removable DSD. According to another aspect, a retaining strip or assembly is attached to a housing in a configuration such that the retaining strip or assembly expands due to heat to increase a resistance to removal of the removable DSD from the housing when the retaining strip or assembly is in a thermally expanded state.
    Type: Grant
    Filed: June 24, 2019
    Date of Patent: December 29, 2020
    Assignee: Western Digital Technologies, Inc.
    Inventors: John Burke, Michael Lavrentiev
  • Patent number: 10727764
    Abstract: A piezoelectric generator is specified, comprising a deformation body, which spans a projection surface and is embodied with a setpoint pressure surface situated opposite the projection surface, wherein the projection surface can be converted from a smaller projection surface when not loaded under pressure into a larger projection surface when pressure is applied to the setpoint pressure surface substantially perpendicular to the projection surface, and a spring effect is provided which counteracts an application of pressure to the setpoint pressure surface, wherein an electromechanical transducer element comprising a piezoelectric material wholly or partly spans the projection surface, such that the transducer element is embodied in an expandable fashion upon pressure being applied to the deformation body, and electrical microenergy can be generated by means of the piezoelectric material.
    Type: Grant
    Filed: February 13, 2016
    Date of Patent: July 28, 2020
    Inventors: Enrico Bischur, Norbert Schwesinger, Sandy Zaehringer
  • Patent number: 10642240
    Abstract: A system includes an apparatus and a processor. The apparatus includes a set of actuator elements that move between two positions. Each actuator element is comprised in: exactly one first subset out of a plurality of non-empty first subsets and exactly one second subset out of a plurality of non-empty second subsets. The processor is configured to generate one or more control commands for a group of subsets out of the first and the second pluralities of subsets in response to a number of moving elements which, if released from the first extreme position during a second sampling cycle, enables production by the apparatus during the second sampling cycle of a sound.
    Type: Grant
    Filed: October 29, 2019
    Date of Patent: May 5, 2020
    Assignee: AUDIO PIXELS LTD.
    Inventors: Daniel Lewin, Yuval Cohen, Eric Andreas Haber, Shay Kaplan, Meir Ben Simon, Raanan Zacher
  • Patent number: 10615719
    Abstract: A vibration motor controller configured to cause a vibrating member in which a vibration is excited based on two frequency signals having a phase difference to move relatively to a contact member, the vibration motor controller including: a memory configured to store a speed characteristic of the vibrating member with respect to a frequency of the two frequency signals; a controller configured to control a speed of the vibrating member by changing the frequency and/or a phase difference of the two frequency signals; a detector configured to detect the speed; and a changing unit configured to acquire change amount and change direction of the speed characteristic based on comparison between the speed detected by the detector and the speed characteristic stored in the memory, and change an activation frequency being a start point of control conducted by the controller based on the change amount and the change direction.
    Type: Grant
    Filed: February 5, 2016
    Date of Patent: April 7, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Shunsuke Miyajima
  • Patent number: 10511237
    Abstract: The present invention provides a driving apparatus capable of suppressing the operation noise. A driving apparatus comprises a piezoelectric element expanding and contracting in accordance with a driving signal; a supporting shaft connected to said piezoelectric element; a movable body frictionally engaged with said supporting shaft and capable of moving along said supporting shaft; and a driving portion applying said driving signal including a first driving signal which moves said movable body towards a first direction to said piezoelectric element, wherein said driving portion can repeatedly apply said first driving signal against said piezoelectric element by taking a first time in between, and said first driving signal comprises a main driving waveform group which moves said movable body to said first direction, and a sub driving waveform group which is placed after said main driving waveform group by having a second rest time shorter than said first time in between.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: December 17, 2019
    Assignee: TDK CORPORATION
    Inventors: Akira Suzuki, Masaru Uno, Kazutomo Imi, Yoshiaki Haga
  • Patent number: 10439522
    Abstract: An identification method is an identification method for use in an identification apparatus that identifies types of brushless DC motors each including a circuit board on which a terminal for tachometer is mounted. The duty ratios of pulses outputted from the terminals for tachometer vary among multiple types of brushless DC motors. The identification method includes: supplying a power supply voltage from the identification apparatus to a brushless DC motor; inputting pulses outputted from the terminal for tachometer of the circuit board to the identification apparatus; obtaining the duty ratio of the pulses as a unique information piece of the brushless DC motor; and identifying the type of the brushless DC motor based on the unique information piece of the brushless DC motor.
    Type: Grant
    Filed: April 30, 2018
    Date of Patent: October 8, 2019
    Assignee: NIDEC CORPORATION
    Inventor: Hideyuki Takemoto
  • Patent number: 10250163
    Abstract: An inverse electrowetting harvesting and scavenging circuit includes a first substrate having first and second surfaces. An electrode is formed proximate the first surface and includes an insulating layer covering a surface of the electrode. An electromechanical systems device includes a moveable mass extending over the first surface of the first substrate that may be displaced relative to the first substrate in three dimensions responsive to external forces applied to the moveable mass. The movable mass includes a moveable electrode and a conductive fluid is positioned between the insulating layer of the electrode and the movable electrode.
    Type: Grant
    Filed: April 29, 2016
    Date of Patent: April 2, 2019
    Assignee: STMicroelectronics S.r.l.
    Inventors: Sara Loi, Alberto Pagani
  • Patent number: 10250166
    Abstract: The invention relates to transformers. More particularly, the invention relates to transformers using (preferably electrostatic and more preferably dielectric elastomer) transducers such as generators and actuators. The invention further provides a priming circuit therefor.
    Type: Grant
    Filed: July 7, 2010
    Date of Patent: April 2, 2019
    Assignee: Auckland UniServices Limited
    Inventors: Iain Alexander Anderson, Thomas Gregory McKay, Benjamin Marc O'Brien, Emilio Patricio Calius
  • Patent number: 10228396
    Abstract: The invention provides circuits, systems and methods for dielectric elastomer device (DED) self-sensing. The circuit comprises a first DED coupled or adapted for coupling to a first voltage source (for providing an actuating or priming signal, for example); a current sensor provided in series with the first DED; and an oscillating signal source coupled to the first DED and adapted to cause an oscillation in a voltage across the DED, wherein the oscillating signal source is decoupled from the first voltage source.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: March 12, 2019
    Assignee: Auckland Uniservices Limited
    Inventors: Todd Alan Gisby, Thomas Gregory McKay, Ho Cheong Lo, Benjamin Marc O'Brien, Iain Alexander Anderson
  • Patent number: 10075100
    Abstract: There is provided a three-dimensional triboelectric energy generator comprising: a moving object; at least two triboelectric energy generator modules defining at least two planes respectively, wherein the moving object is disposed between the least two planes; and at least two elastic members configured to couple the moving object to the at least two triboelectric energy generator modules respectively, wherein a movement of the moving object allows each of the at least two triboelectric energy generator modules to generate a triboelectric energy.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: September 11, 2018
    Assignee: Research & Business Foundation Sungkyunkwan University
    Inventors: Sang Woo Kim, Kwon Hoon Han, Seong Su Kim, Wan Chul Seung, Sung Kyun Kim
  • Patent number: 10018971
    Abstract: A controller for controlling a micromechanical actuator having a setpoint input for receiving a setpoint signal, an actual-value input for receiving an actual-value signal, a setpoint filter to attenuate a first predefined frequency or a first predefined frequency band in the received setpoint signal to generate a filtered setpoint signal, a differentiator to generate a time derivative of the received actual-value signal; a controller core to generate a manipulated variable signal based on a system deviation between the filtered setpoint signal and the actual-value signal; a phase rotation element to modify the phase of the difference between the manipulated variable signal and the derivative of the actual-value signal for a second frequency or in a predefined second frequency band to generate a modified manipulated variable signal; and a first manipulated variable filter to suppress a predefined third frequency in the modified manipulated variable signal.
    Type: Grant
    Filed: February 3, 2017
    Date of Patent: July 10, 2018
    Assignee: ROBERT BOSCH GMBH
    Inventors: Andreas Ortseifen, Mohamad Iyad Al Dibs
  • Patent number: 9984830
    Abstract: A variable capacitor, including: two movable plates, two poles, and one rotary shaft. The two movable plates are conductor belts, and the conductor belts are sheathed in insulators. The two poles are conductors, and each is capable of rotating around an axis thereof. First ends of the two movable plates are connected via the insulators and fixed on the rotary shaft, and second ends of the two movable plates are connected to the two poles, respectively. A conductor member of the two movable plates directly contacts the two poles. The lengths of the two movable plates are identical, and are greater than the distance from one pole to the rotary shaft.
    Type: Grant
    Filed: December 6, 2016
    Date of Patent: May 29, 2018
    Inventor: Mingmei Liu
  • Patent number: 9964777
    Abstract: Various embodiments provide an optical image stabilization circuit including a drive circuit having a power waveform generator and a power waveform conversion circuit. The power waveform generator generates a power waveform. The power waveform conversion circuit converts the power waveform to a power drive signal. An actuator is then driven by the power drive signal to move a lens accordingly and compensate for any movements and vibrations of a housing of the lens.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: May 8, 2018
    Assignee: STMicroelectronics, Inc.
    Inventors: Mark A. Lysinger, Chih-Hung Tai, James L. Worley, Pavan Nallamothu
  • Patent number: 9964776
    Abstract: Various embodiments provide an optical image stabilization circuit including a drive circuit having a power waveform generator and a power waveform conversion circuit. The power waveform generator generates a power waveform. The power waveform conversion circuit converts the power waveform to a power drive signal. An actuator is then driven by the power drive signal to move a lens accordingly and compensate for any movements and vibrations of a housing of the lens.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: May 8, 2018
    Assignee: STMicroelectronics, Inc.
    Inventors: Mark A. Lysinger, Chih-Hung Tai, James L. Worley, Pavan Nallamothu
  • Patent number: 9910274
    Abstract: A vibration driving device that is capable of exciting a vibration of desired amplitude with a low voltage. A vibration body has a plate-like elastic body and an electro-mechanical energy conversion element that is joined to the elastic body. A control unit excites a vibration in a first vibration mode and a vibration in a second vibration mode in the vibration body by applying alternation voltages to the electro-mechanical energy conversion element. Orders or numbers of nodes of the vibrations in the first and second modes in a first direction that intersects perpendicularly with a thickness direction of the elastic body are mutually different by one. And orders or numbers of nodes of the vibrations in the first and second modes in a second direction that intersects perpendicularly with the thickness direction of the elastic body and the first direction are mutually different by one.
    Type: Grant
    Filed: February 22, 2016
    Date of Patent: March 6, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventor: Akira Shimada
  • Patent number: 9859956
    Abstract: This disclosure provides systems, methods and apparatus for wireless power transfer and particularly wireless power transfer to remote system such as electric vehicles. In one aspect an apparatus for use with a wireless power transfer transmitter device comprising a first inductive element for generating a magnetic field, is provided. The apparatus comprises a direct current (DC) power source having an adjustable output voltage. The apparatus also comprises an inverter configured to convert the adjustable output voltage of the DC power source to alternating current. The apparatus also comprises at least one controller configured to receive an indication of current in the first inductive element and control the output voltage of the DC power source in response to the indication of current in the first inductive element. The apparatus reduces distortion signals in the alternating current output of the inverter while maintaining current in the inductive element substantially constant.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: January 2, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Michael Kissin, Nicholas A Keeling, Jonathan Beaver, Edward Van Boheemen
  • Patent number: 9641107
    Abstract: A motor controller for an electric vehicle sufficiently reduces vibration components caused by torque ripples passing through a resonance frequency of a vehicle body. The motor controller includes motor torque setting means for generating a first torque command, based on vehicle information, rotation position detection means for detecting a rotation position of the motor, rotation speed calculation means for calculating a rotation speed from a rotation position signal, a high-pass filter that extracts an AC signal component of a rotation speed signal, and a resonance suppression gain circuit that outputs a resonance suppression signal. A signal in which the resonance suppression signal is added to or subtracted from the first torque command is used as a second torque command so as to perform drive control for the motor.
    Type: Grant
    Filed: October 15, 2012
    Date of Patent: May 2, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Keiichi Enoki, Masahiro Iezawa, Nobuhide Mori, Yasufumi Ogawa, Hiroyuki Kobayashi
  • Patent number: 9632429
    Abstract: A system and method that bends a reticle and senses a curvature of a bent reticle in real-time. The system includes movable reticle stage, reticle vacuum clamps, sensor systems, and reticle bender. The reticle bender comprises piezo actuators. The sensor systems comprises measurement targets and corresponding sensors. The sensors are attached to the movable reticle stage and the measurement targets are attached to the reticle clamps, the reticle bender, or on reticle surfaces. The system is configured to determine a width of the reticle or distance between measurement targets at opposing ends of the reticle, measure a first rotational angle at a first end of the reticle, and measure a second local rotational angle at a second end of the reticle that is opposite to the first end. Based on the width or distance and the first and second angles, a field curvature of the reticle is determined.
    Type: Grant
    Filed: August 1, 2013
    Date of Patent: April 25, 2017
    Assignees: ASML Holding N.V., ASML Netherlands B.V.
    Inventors: Christopher Charles Ward, Martinus Hendrikus Antonius Leenders, Mark Josef Schuster, Christiaan Louis Valentin
  • Patent number: 9618646
    Abstract: A system for synchronizing instruments in a drill pipe to detect formation characteristics comprises at least one first transmitter for transmitting a first signal, at least one first receiver for receiving a second signal having information based on the first signal, at least one acoustic transmitter for transmitting an acoustic signal, and at least one acoustic sensor electrically connected to one of the at least one first transmitter and the at least one first receiver, the at least one acoustic sensor for sensing the acoustic signal for synchronizing the at least one first transmitter and the at least one first receiver.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: April 11, 2017
    Assignee: BAKERY HUGHES INCORPORATED
    Inventor: Christian Fulda
  • Patent number: 9320336
    Abstract: A device for applying decoration to a nail. The device includes an elongated member having a first end having a mounting feature thereon, the mounting feature configured to maintain the first end of the device in a fixed position, and a generally opposite, free-floating end configured to be coupled to a nail decoration, the free-floating end configured to provide controlled movement of the decoration. The elongated member is configured to inhibit unintentional movement thereof.
    Type: Grant
    Filed: February 13, 2013
    Date of Patent: April 26, 2016
    Assignee: Young Nails, Inc.
    Inventor: Habib Salo
  • Patent number: 9318980
    Abstract: A piezoelectric actuator includes a vibrating body including a piezoelectric device; a driving circuit that supplies a driving signal to the piezoelectric device; a phase difference detecting circuit that detects a phase difference between the driving signal and a detection signal detected based on vibration of the vibrating body; and a frequency controller that controls the frequency and power of the driving signal, wherein the frequency controller sets the power to an upper limit voltage value when the frequency is changed so that the phase difference falls within a predetermined range and sets the voltage to a lower limit voltage value smaller than the upper limit voltage value when the phase difference is outside the predetermined range.
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: April 19, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Osamu Urano
  • Publication number: 20150146080
    Abstract: When a vibration-type actuator is in a non-driving period, at least one of a voltage amplitude and a phase difference of an alternate signal applied to an electrode of a piezoelectric element is set to be equal to a minimum value or a maximum value of a dead zone in terms of the voltage amplitude or the phase difference.
    Type: Application
    Filed: November 24, 2014
    Publication date: May 28, 2015
    Inventor: Hiromitsu Morita
  • Publication number: 20150130374
    Abstract: A switched resonant power amplifier system for ultrasonic transducers is disclosed. The system includes an amplifier that receives and processes a driver output signal for generating a drive signal that is provided to an ultrasonic device for controlling output of the ultrasonic device. An output control circuit receives and processes a signal related to a feedback signal generated by the ultrasonic device and a divider reference signal, and generates a compensated clock signal that is adjusted for at least one of phase and frequency differences between the received feedback signal and the divider reference signal. A compensated drive circuit receives and processes the compensated clock signal for generating the divider reference signal, and for generating the driver output signal.
    Type: Application
    Filed: January 23, 2015
    Publication date: May 14, 2015
    Inventors: JAMES H. ORSZULAK, JAMES W. MCPHERSON
  • Publication number: 20150108924
    Abstract: A system for driving a piezoelectric load includes a direct current (DC) voltage source and a bi-directional DC-to-DC converter having a primary side coupled to the DC voltage source and a secondary side and comprising a control input configured to receive a first control signal configured to control conversion of a first voltage on the primary side of the bi-directional DC-to-DC converter to a second voltage on the secondary side of the bi-directional DC-to-DC converter. The driver system also includes a capacitor coupled to the secondary side of the bi-directional DC-to-DC converter and configured to remove a DC offset of the second voltage and includes a reactive load having a first terminal coupled to the capacitor and a second terminal coupled to the secondary side of the bi-directional DC-to-DC converter.
    Type: Application
    Filed: December 30, 2014
    Publication date: April 23, 2015
    Inventors: Ramanujam Ramabhadran, John Stanley Glaser
  • Publication number: 20150108923
    Abstract: Method for controlling a piezoelectric actuator acting on valve elements to open or close a fuel injector respectively allowing or preventing fuel injection into a combustion chamber of an engine, the method includes: applying to the piezoelectric actuator a nominal electrical charge to open the injector, as a function of the torque required and the engine speed, to open the valve elements for fuel injection, thereafter applying to the actuator at least one electrical polarization charge, to polarize the actuator during an opening phase of the injector and fuel injection into the combustion chamber, thereafter commanding the closure of the injector by applying to the actuator at least one electrical discharge to close the valve elements, the step of applying the electrical polarization charge including a prior step of increasing the value of the charge current to a value greater than that of the nominal charge.
    Type: Application
    Filed: May 21, 2013
    Publication date: April 23, 2015
    Applicants: CONTINENTAL AUTOMOTIVE GMBH, CONTINENTAL AUTOMOTIVE FRANCE
    Inventors: Michael Leblon, Alain Atanasyan, Jeremie Memain
  • Publication number: 20150102750
    Abstract: There are provided an apparatus for driving a piezo actuator and a method of driving the same. The apparatus includes: a control unit generating a digital control signal and converting the digital control signal into an analog control signal; a driving unit amplifying and not inverting the analog control signal to generate a first driving signal and amplifying and inverting the analog control signal to generate a second driving signal, with respect to a predetermined common voltage, and applying the first and second driving signals to both terminals of a piezo actuator; and an offset determining unit determining an offset in the first and second driving signals based on a voltage according to a current flowing in the piezo actuator, wherein the control unit generates the digital control signal to have an intermediate level in a predetermined offset detection section.
    Type: Application
    Filed: January 3, 2014
    Publication date: April 16, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Chan Woo PARK, Joo Yul Ko
  • Patent number: 9000690
    Abstract: A method for driving a piezoelectric transducer is provided. An input signal is received. At least one of a plurality of modes is selected for a buck-boost stage from a comparison of a desired voltage on a capacitor to a first threshold and a second threshold, where the desired voltage is determined from the input signal. The piezoelectric transducer is then driven substantially within the audio band using the desired voltage on the capacitor using an H-bridge that changes state with each zero-crossing.
    Type: Grant
    Filed: June 13, 2012
    Date of Patent: April 7, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Mayank Garg, David J. Baldwin, Boqiang Xiao
  • Publication number: 20150091476
    Abstract: A device for driving a piezo-actuator comprises: a signal generating unit for generating signals having a constant frequency; and a modulation unit for modulating the signals generated from the signal generating unit and outputting the modulated signals, wherein the modulation unit comprises a density modulation unit which performs a first mode for repeating an operation for outputting an input signal at a first constant number and an operation for blocking the input signal at a second constant number, and which performs a second mode for repeating an operation for outputting the input signal during a first period and an operation for blocking the input signal during a second period. The device for driving the piezo-actuator and the method therefor can reduce the noise generated when the piezo-actuator for an automatic focus function of a camera is driven.
    Type: Application
    Filed: March 11, 2013
    Publication date: April 2, 2015
    Inventors: Kyoungsoo Kwon, Chaedong Go, Hyunwoo Do
  • Publication number: 20150091477
    Abstract: The present invention relates to an electromechanical transducer capable of arbitrarily varying the amount of deflection of a vibrating membrane for every element. The electromechanical transducer includes a plurality of elements including at least one cell that includes a first electrode and a second electrode opposed to the first electrode with a gap sandwiched therebetween and a direct-current voltage applying unit configured to be provided for each element and to separately apply a direct-current voltage to the first electrodes in each element. The first electrodes and the second electrodes are electrically separated for every element.
    Type: Application
    Filed: December 5, 2014
    Publication date: April 2, 2015
    Inventors: Atsushi Kandori, Makoto Takagi, Masao Majima
  • Publication number: 20150085180
    Abstract: A driver circuit for electro-active polymer (EAP) device has a shared, voltage boost circuit that is coupled to drive a common terminal of first and second EAP devices to a given voltage. A first voltage boost circuit is coupled to drive a respective terminal of the first EAP device to an opposite polarity voltage, while a second voltage boost circuit is coupled to drive a respective terminal of the second EAP device to an opposite polarity voltage. Other embodiments are also described and claimed.
    Type: Application
    Filed: September 25, 2013
    Publication date: March 26, 2015
    Applicant: Apple Inc.
    Inventors: Jeffrey N. Gleason, Richard H. Tsai
  • Patent number: 8988017
    Abstract: A mechanical resonator with a closed feed-back damping loop is provided. Displacement in the mechanical resonator is opposed with a damping force determined by the closed feed-back loop that comprises a signal processing filter with associated phase adjustment. An oscillation-free configuration that allows high signal amplification is achieved.
    Type: Grant
    Filed: June 26, 2013
    Date of Patent: March 24, 2015
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Heikki Kuisma
  • Publication number: 20150069934
    Abstract: A method for regenerative driving of one or more transducers includes, for each of a plurality of driving cycles, enabling a number of transducers for driving, configuring a configurable capacitive energy storage element based on the number of enabled transducers and a desired overall capacitance, transferring a predetermined quantity of energy from a power supply to a first inductive energy transfer element, distributing the predetermined quantity of energy from the first inductive energy transfer element to the configurable capacitive energy storage element and to one or more other capacitive energy storage elements, each of the other capacitive energy storage elements coupled to an associated transducer, transferring energy from the one or more capacitive energy storage elements and from the configurable capacitive energy storage element to a second inductive energy transfer element, and transferring energy from the second inductive energy transfer element to the power supply.
    Type: Application
    Filed: September 10, 2013
    Publication date: March 12, 2015
    Inventors: Deane A. Gardner, Paul A. Hoisington
  • Publication number: 20150054870
    Abstract: A piezoelectric device comprises a piezoelectric element including a piezoelectric layer formed of a complex oxide having a perovskite structure including bismuth, iron, barium, and titanium, and a pair of electrodes placing the piezoelectric layer therebetween. The piezoelectric element is driven with a first drive mode and a second drive mode. In the first drive mode, the piezoelectric element is driven at a first speed, and is held to a first voltage V1 in a first hold process during a first time defined based on a natural period Tc. In the second drive mode, the piezoelectric element is driven at a higher speed than the first speed, and is held to the first voltage V1 in the first hold process during a second time shorter than the first time, and an intermediate voltage Vm is set to be equal to or lower than a voltage corresponding to the coercive electric field Ec.
    Type: Application
    Filed: August 20, 2014
    Publication date: February 26, 2015
    Inventor: Akio KONISHI
  • Publication number: 20140366672
    Abstract: A piezoelectric actuator includes a frequency controller that controls the frequency and power of the driving signal, wherein when the phase difference falls within a predetermined range, the control unit stores the value of the frequency of the driving signal as a first frequency memory value, sets a voltage to a upper limit voltage value, and performs control of adjusting the frequency of the driving signal so that the phase difference is maintained to be within a predetermined range, and when the frequency of the driving signal is changed from the first frequency memory value by an amount exceeding a first value determined in advance, the control unit stores the value of the frequency of the driving signal as a second frequency memory value and sets the voltage to a lower limit voltage value lower than the upper limit voltage value.
    Type: Application
    Filed: September 2, 2014
    Publication date: December 18, 2014
    Inventor: Osamu URANO
  • Publication number: 20140355093
    Abstract: The present invention is a rotary actuator having segments, which are spaced apart and are connected by means of at least one support structure, and at least one actuator for exerting forces, characterized in that the support structure is substantially rotationally symmetrical about an axis and is composed of elements which are not oriented parallel to the axis or which are twisted through an angle in relation to the axis, and the elements can be changed by rotation about the axis and the actuator can exert forces to at least one of the segments and the support structure in the direction of the axis.
    Type: Application
    Filed: September 18, 2012
    Publication date: December 4, 2014
    Inventor: Ernst Goepel
  • Patent number: 8901859
    Abstract: A control circuit is provided for a vibration-type actuator that generates a vibration wave in a vibrating member by applying an alternating voltage, and relatively rotates a moving member contacting protrusions of the vibrating member. The control circuit includes a feedback control circuit and a repetitive compensator. The feedback control circuit subjects the vibration-type actuator to feedback control based on a deviation between a relative speed between the moving member and the vibrating member and a command speed or a deviation between a relative position between the moving member and the vibrating member and a command position. The repetitive compensator provides a repetitive period that is set to T/(an integral multiple of fs), where T is a period of rotation of the moving member, and fs is a spatial frequency of a speed deviation based on a contact area distribution between the protrusions and the moving member.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: December 2, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Jun Sumioka, Kenichi Kataoka
  • Publication number: 20140340001
    Abstract: A method is disclosed for driving a piezoelectric actuator with a piezoelectric stack, which is operated as an actuating element of an injector. The piezoelectric stack is polarized during production by a polarization process initially with a first field strength, which results in a first length of the piezoelectric stack. According to the method, the piezoelectric stack is driven during operation at a second field strength, which is smaller than the first field strength, wherein a setpoint length for the piezoelectric stack is defined depending on the second field strength. In addition, a change in length caused by depolarization from the setpoint length of the piezoelectric stack is monitored. Then, when a predetermined threshold value for the change in length is reached, the piezoelectric stack is operated at a third field strength until the setpoint length for said piezoelectric stack is reached.
    Type: Application
    Filed: August 20, 2012
    Publication date: November 20, 2014
    Inventor: Uwe Jung
  • Publication number: 20140340002
    Abstract: To keep velocities of a plurality of ultrasonic motors equal; and to suppress the deterioration of the performance, the occurrence of noise and the decrease of the life have been unavoidable problems, a first drive signal and/or a second drive signal are values that are corrected by values obtained from characteristics of a first ultrasonic motor, which are detected by making a second ultrasonic motor generate a standing wave and making the first ultrasonic motor generate a traveling wave, and characteristics of the second ultrasonic motor, which are detected by making the first ultrasonic motor generate a standing wave and making the second ultrasonic motor generate a traveling wave.
    Type: Application
    Filed: May 6, 2014
    Publication date: November 20, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Yoshifumi NISHIMOTO
  • Patent number: 8890446
    Abstract: A system is provided for controlling the amplitude of a vibrating resonant sensor through a drive signal applied to the resonator. The system comprises a controller that provides the drive signal to a forcer coupled to the resonator to excite the resonator into vibration at its resonant frequency. The system further comprises a buffer having an input node that receives charge of a pickoff capacitor of the resonator that is a measure of the resonator vibration and a current reference waveform. The buffer provides an output that is a difference signal that represents an error of the resonator vibration that corresponds to a difference between the measured resonator vibration and the current reference waveform, wherein the controller adjusts the drive signal in order to null the difference signal.
    Type: Grant
    Filed: November 14, 2012
    Date of Patent: November 18, 2014
    Assignee: Northrop Grumman Systems Corporation
    Inventor: Daniel A. Tazartes
  • Publication number: 20140327377
    Abstract: A system for emitting an ultrasonic signal is provided. The system includes a first ultrasonic transducer and a second ultrasonic transducer. A plate of the first ultrasonic element faces a plate of the second ultrasonic element such that the plate of the first ultrasonic element is spaced apart from the plate of the second ultrasonic element by a gap. During operation of the first and second ultrasonic transducers, a uniform or omnidirectional ultrasonic signal may be emitted from the gap.
    Type: Application
    Filed: May 2, 2014
    Publication date: November 6, 2014
    Applicant: LOKDON LLC, DBA MAD GENIUS CONTROLLERS
    Inventor: Donald Curtis RIDER
  • Publication number: 20140327378
    Abstract: The present invention relates to a driver device (40; 60) for driving a capacitive load (12), in particular an ultrasound transducer (12) having one or more transducer elements, comprising an output terminal (42; 68) for providing an alternating drive voltage (V14; V22) to the load (12), a plurality of voltage supply elements (46, 48, 50, 52; 72, 74) for providing intermediate voltage levels (V16), a plurality of controllable connecting means (S0-S7) each associated to one of the voltage supply elements (46, 48, 50, 52; 72, 74) for connecting the voltage supply elements (46, 48, 50, 52; 72, 74) to the output terminal (42; 68) and for supplying one of the intermediate voltage levels (V16) or a sum of a plurality of the intermediate voltage levels (V16) as the alternating drive voltage (V14; V22) to the output terminal.
    Type: Application
    Filed: December 12, 2012
    Publication date: November 6, 2014
    Applicant: KONNKLIJKE PHILIPS N.V.
    Inventor: Antonia Cornelia Van Rens
  • Publication number: 20140306624
    Abstract: A system for controlling an active material actuator includes an active material actuator configured to actuate when energized, a power supply configured to supply electrical power, and a control circuitry including a plurality of circuits and configured to selectively establish an electrical connection between the active material actuator and the power supply upon receipt of an activation signal. The control circuitry is configured to de-energize at least one of the circuits when no activation signal is received by the control circuitry in order to minimize parasitic current drawn from the power supply.
    Type: Application
    Filed: March 27, 2014
    Publication date: October 16, 2014
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Chandra S. Namuduri, Lei Hao, Paul W. Alexander, Xiujie Gao
  • Publication number: 20140306623
    Abstract: A method of operating a system including a MEMS device of an integrated circuit die includes generating an indicator of a device parameter of the MEMS device in a first mode of operating the system using a monitor structure formed using a MEMS structural layer of the integrated circuit die. The method includes generating, using a CMOS device of the integrated circuit die, a signal indicative of the device parameter and based on the indicator. The device parameter may be a geometric dimension of the MEMS device. The method may include, in a second mode of operating the system, compensating for a difference between a value of the signal and a target value of the signal. The method may include re-generating the indicator after exposing the MEMS device to stress and generating a second signal indicating a change in the device parameter.
    Type: Application
    Filed: December 20, 2013
    Publication date: October 16, 2014
    Applicant: Silicon Laboratories Inc.
    Inventors: Aaron J. Caffee, Brian G. Drost, Emmanuel P. Quevy
  • Patent number: 8860336
    Abstract: A system and method is provided for determining the capacitance between electrodes of an artificial muscle or dielectric elastomer actuator (DEA). The method comprises measuring the voltage difference between the electrodes of the DEA, the first derivative of that voltage with respect to time, and the total instantaneous current through the DEA, then calculating the capacitance of the DEA as the difference between the total instantaneous current through the DEA and the product of the voltage between the electrodes and an error term, divided by the first derivative of the voltage between the electrodes with respect to time. The capacitance may then be used to derive estimates of the leakage current, charge upon the DEA, and/or the physical state of the DEA, thereby implementing self-sensing to allow closed-loop feedback control of DEA actuation.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: October 14, 2014
    Assignee: Auckland UniServices Limited
    Inventors: Iain Alexander Anderson, Emilio Patricio Calius, Todd Alan Gisby, Benjamin Marc O'Brien, Shane Xie
  • Patent number: 8853975
    Abstract: In one embodiment, a device is provided that includes: a cascaded electrostatic actuator defining a stack in a substrate having a plurality of gaps between parallel plate electrodes; and a controller configured to drive the cascaded electrostatic actuator to open and close selected ones of the gaps.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: October 7, 2014
    Assignee: DigitalOptics Corporation MEMS
    Inventor: Roman C. Gutierrez
  • Publication number: 20140292233
    Abstract: A driving circuit to drive a vibration member comprising an electro-mechanical energy conversion element includes a transformer connected in parallel to the electro-mechanical energy conversion element. The transformer includes a primary coil configured such that an alternating voltage is applied to the primary coil, and a secondary coil connected to the electro-mechanical energy conversion element in parallel, and an inductor connected to the primary coil in series, Parameters of the driving circuit are set such that, when a frequency of a peak voltage applied to the electro-mechanical energy conversion element is denoted by fe and a driving frequency of the vibration member is denoted by fd, a condition fe<1.5·fd is satisfied.
    Type: Application
    Filed: June 17, 2014
    Publication date: October 2, 2014
    Inventors: Jun Sumioka, Kenichi Kataoka
  • Publication number: 20140285121
    Abstract: The present disclosure is directed to a modulation scheme for driving a piezo element. In one embodiment, a device may comprise, for example, a piezo element, voltage rails and bridge circuitry. The bridge circuitry may be coupled between the piezo element and the voltage rails. The bridge circuitry may include at least signal sources configured to generate drive signals that cause the piezo element to generate mechanical movement while being coupled to at least one of the voltage rails. In the same or a different embodiment the bridge circuitry may further include comparators, the output of the comparators being usable to determine the resonant frequency of the piezo element. The operating frequency of the bridge circuitry may be configured based on the resonant frequency of the piezo element.
    Type: Application
    Filed: November 7, 2012
    Publication date: September 25, 2014
    Inventors: Laszlo Balogh, Daniel Robert Slater
  • Publication number: 20140265943
    Abstract: A first controller can have a greater number of output lines than a second controller has input lines. The first controller can receive an ultrasonic transducer control signal and provide a first portion of the control signal to the first processor, where the length of the first portion is less than or equal to the number of input lines of the second processor. The first processor can send portions of the control signal to a plurality of second processors. Each of the plurality of second processors can have a number of input lines less than the number of output lines of the first processor. Portions of the control signal can be sent through the output lines of the first processor to the plurality of second processors at substantially the same time.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: uBeam Inc.
    Inventors: Matthew Angle, Marc Berte
  • Patent number: RE45555
    Abstract: A power supply apparatus with a plurality of power supply circuits each having a piezoelectric transformer and a voltage-controlled oscillator which generates a signal at an operating frequency used to drive the piezoelectric transformer in accordance with a control signal, includes a frequency-dividing circuit which divides the operating frequency generated by a voltage-controlled oscillator in at least one power supply circuit, and outputs a signal at a driving frequency to drive a piezoelectric transformer in the one power supply circuit. When at least one power supply circuit and remaining power supply circuits output voltages, the operating frequency generated by the voltage-controlled oscillator in the one power supply circuit is controlled to be higher than the operating frequency generated by the voltage-controlled oscillator in another power supply circuit.
    Type: Grant
    Filed: July 1, 2011
    Date of Patent: June 9, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Atsuhiko Yamaguchi
  • Patent number: RE46414
    Abstract: A power supply apparatus with a plurality of power supply circuits each having a piezoelectric transformer and a voltage-controlled oscillator which generates a signal at an operating frequency used to drive the piezoelectric transformer in accordance with a control signal, includes a frequency-dividing circuit which divides the operating frequency generated by a voltage-controlled oscillator in at least one power supply circuit, and outputs a signal at a driving frequency to drive a piezoelectric transformer in the one power supply circuit. When at least one power supply circuit and remaining power supply circuits output voltages, the operating frequency generated by the voltage-controlled oscillator in the one power supply circuit is controlled to be higher than the operating frequency generated by the voltage-controlled oscillator in another power supply circuit.
    Type: Grant
    Filed: September 26, 2011
    Date of Patent: May 23, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Atsuhiko Yamaguchi