Magnetostrictive Motor Patents (Class 318/118)
  • Patent number: 10393897
    Abstract: This disclosure is related to marine seismic sources, for example marine seismic sources known in the art as benders. Some embodiments of this disclosure use Lorentz forces to produce seismic energy. For example, magnets and wire coils may be attached to one or more plates of a marine seismic source, and the Lorentz interaction between them may cause deformation of the plates to produce seismic energy. Such marine seismic sources may be components of a marine seismic survey system, and may be used in a method of marine seismic surveying. Methods of making marine seismic sources are also disclosed.
    Type: Grant
    Filed: April 17, 2018
    Date of Patent: August 27, 2019
    Assignee: PGS Geophysical AS
    Inventors: Mattias Oscarsson, Oeystein Traetten, Rune Voldsbekk, Rune Toennessen
  • Patent number: 10178459
    Abstract: A loudspeaker assembly may be configured with at least one driver disposed between first and second acoustic impedance structures. The first and second impedance structures can be arranged with one or more layers that have similar, or dissimilar, thicknesses. The first and second impedance structures can respectively be configured to maintain symmetric acoustic impedance on opposite sides of the driver during operation of the driver.
    Type: Grant
    Filed: March 9, 2017
    Date of Patent: January 8, 2019
    Assignee: MrSpeakers, LLC
    Inventors: Daniel William Clark, Robert Jason Egger
  • Patent number: 9971049
    Abstract: This disclosure is related to marine seismic sources, for example marine seismic sources known in the art as benders. Some embodiments of this disclosure use Lorentz forces to produce seismic energy. For example, magnets and wire coils may be attached to one or more plates of a marine seismic source, and the Lorentz interaction between them may cause deformation of the plates to produce seismic energy. Such marine seismic sources may be components of a marine seismic survey system, and may be used in a method of marine seismic surveying. Methods of making marine seismic sources are also disclosed.
    Type: Grant
    Filed: October 24, 2014
    Date of Patent: May 15, 2018
    Assignee: PGS Geophysical AS
    Inventors: Mattias Oscarsson, Oeystein Traetten, Rune Voldsbekk, Rune Tønnessen
  • Patent number: 9721720
    Abstract: A power conditioning device reduces capacitive-in-nature, out of phase current (verses voltage), non-linear distortion, and/or leading power factor “noise” in electrical current in an electrical panel, improving the power efficiency of devices connected to the panel. The physical and electrical specifications of the device allow it to be more easily installed and give it a more robust installation environment.
    Type: Grant
    Filed: September 18, 2014
    Date of Patent: August 1, 2017
    Assignee: Main Street Energy, LLC
    Inventors: Timothy Andrew Rosemore, James Blakeley Owings
  • Patent number: 9634550
    Abstract: An inertial drive actuator includes a displacement unit which generates a minute displacement in a first direction, and in a second direction, a coil which generates a magnetic flux, a movable object which has a surface facing at least one surface of the coil, and a first yoke which converges the magnetic flux generated by the coil, at a predetermined position, a detecting unit which detects an electric signal of the coil, reflecting a change in the magnetic flux near the coil based on a positional relationship of the movable object and the coil, and a judging unit which judges a position of the movable object, and the inertial drive actuator drives the movable object by controlling a frictional force acting on the movable object, by controlling the magnetic flux generated by the coil, and the coil carries out generation of the magnetic flux and detection of the magnetic flux.
    Type: Grant
    Filed: November 11, 2014
    Date of Patent: April 25, 2017
    Assignee: OLYMPUS CORPORATION
    Inventor: Masaya Takahashi
  • Patent number: 9568355
    Abstract: A detection, analysis, and correction of unwanted frequencies is provided. The elimination of a wolf tone may be done through either correction of surface instability or dynamic frequency correction by a signal generator.
    Type: Grant
    Filed: January 11, 2016
    Date of Patent: February 14, 2017
    Assignee: FIRST PRINCIPLES, INC.
    Inventor: Keith A. Raniere
  • Patent number: 9479031
    Abstract: A motor includes a position-sensing magnetostrictive element that extends along a stator bore. A slider slides in the stator bore and includes a stack of motor magnets. The stack includes a first stack end that provides a magnetic field pattern that magnetizes a region of the magnetostrictive element. The motor includes shield elements such as a non-magnetic shield tube and a magnetic flux diverter.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: October 25, 2016
    Assignee: MTS SENSOR TECHNOLOGIE GMBH & CO. KG
    Inventors: Andre Beste, Manfred Sapp, Ingo Walter
  • Patent number: 9095020
    Abstract: The generator for a piezoelectric motor is also suitable for powering a high power LED for a dental polymerisation lamp via a rectifier, and comprises two transformers each including a primary winding and a secondary winding and four switches controlled by an ultrasonic reference oscillator, two switches being arranged to alternately connect the secondary windings of the two transformers to the piezoelectric load, and the other two switches being arranged to alternately connect the two primary windings to a voltage supply so that during the positive alternation, the primary winding of one of the transformers is charged with energy whereas the secondary winding of the other transformer is discharged into the piezoelectric load, and so that during the negative alternation, the secondary winding of the first transformer discharges the energy thereof whereas the primary winding of the first transformer is charged.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: July 28, 2015
    Assignee: OZONE TECHNOLOGIES LTD
    Inventors: Denis Klopfenstein, Daniel Baour, James Fowler
  • Patent number: 9084048
    Abstract: Systems and methods for generating sound, detecting sound, and generating and detecting sound are provided. An array of audio transducers can be provided whereby each audio transducer in the array can be optimized for a narrow range of sound frequencies. When operating at or close to its resonant frequency, a transducer can generate (and/or detect) sound with a higher efficiency and less distortion as compared to other frequencies. Accordingly, sound may be divided into component signals such that each transducer is only responsible for generating (and/or detection) sound close to its resonant frequency. This sound reproduction (and/or detection) technique can increase efficiency, and therefore, can increase the total output volume that an array can generate using a given amount of input power when generating sound (and/or increase the total output power that an array can generate using a given amount of input volume when detecting sound).
    Type: Grant
    Filed: June 17, 2011
    Date of Patent: July 14, 2015
    Assignee: SHINDIG, INC.
    Inventor: Steven M. Gottlieb
  • Patent number: 9050161
    Abstract: An apparatus and a handheld electrical tool system comprising an insert receivable in an ultrasonic handpiece comprising a primary coil disposed about a well and electrically connected to a primary current supply, the insert comprising a secondary coil disposed about at least a portion of the insert dimensioned and arranged to be disposable within the well such that the secondary coil is inductively coupled to the primary coil, the secondary coil in electrical communication with at least one electrical device powered by the secondary coil. A method of operating a handpiece and of retrofitting a handpiece is also disclosed.
    Type: Grant
    Filed: April 25, 2012
    Date of Patent: June 9, 2015
    Inventor: James S. Feine
  • Publication number: 20140217932
    Abstract: A method of minimizing the cold start delay and impact fatigue of an actuator includes calibrating the actuator by initially raising the temperature to a desired operating temperature through induction heating of the actuator rod. Additionally, a control system for a magnetostrictive actuator includes a rod of magnetostrictive material, a solenoid coil wrapped at least once around said rod, and a controller operatively connected to said solenoid coil wherein the controller detects an impact of the rod with another surface and adjusts the operation of the actuator to minimize the potential for additional future impacts. The rod may be segmented and include end caps to further reduce the potential for impact fatigue.
    Type: Application
    Filed: February 6, 2014
    Publication date: August 7, 2014
    Applicant: GREAT PLAINS DIESEL TECHNOLOGIES, L.C.
    Inventors: Charles B. Bright, Russell Bosch
  • Patent number: 8766565
    Abstract: Embodiments of the present invention provide a motor-driven mechanical system with a detection system to measure properties of a back channel and derive oscillatory characteristics of the mechanical system. Uses of the detection system may include calculating the resonant frequency of the mechanical system and a threshold drive DTH required to move the mechanical system from the starting mechanical stop position. System manufacturers often do not know the resonant frequency and DTH of their mechanical systems precisely. Therefore, the calculation of the specific mechanical system's resonant frequency and DTH rather than depending on the manufacturer's expected values improves precision in the mechanical system use. The backchannel calculations may be used either to replace or to improve corresponding pre-programmed values.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: July 1, 2014
    Assignee: Analog Devices, Inc.
    Inventors: Colin Lyden, Javier Calpe-Maravilla, Mark Murphy, Eoin English, Denis Martin O'Connor, Tudor Vinereanu, Alan Cahill, Sean Brennan
  • Patent number: 8517239
    Abstract: In various embodiments, a surgical stapling instrument can comprise a plurality of magnetic elements configured to articulate an end effector of the surgical instrument. The surgical instrument can comprise at least one electromagnet which can be selectively activated, or polarized, to generate a magnetic field sufficient to motivate a second magnetic element, such as a permanent magnet and/or an iron core, for example, mounted to the end effector. In certain embodiments, a surgical stapling instrument can comprise a plurality of magnetic elements configured to open and/or close an end effector of the surgical instrument. In at least one embodiment, a surgical stapling instrument can comprise a plurality of magnetic elements configured to advance and/or retract a firing bar, cutting member, and/or staple sled within the surgical instrument in order to incise and/or staple tissue positioned within an end effector of the surgical instrument.
    Type: Grant
    Filed: February 5, 2009
    Date of Patent: August 27, 2013
    Assignee: Ethicon Endo-Surgery, Inc.
    Inventors: Charles J. Scheib, Gary S. Jaworek, Steven G. Hall
  • Patent number: 8466637
    Abstract: A method, computer readable medium, and apparatus for controlling a moveable element includes generating and providing with a control device one or more driving signals to one or more positioning actuators to move the moveable element towards a target position based on a target travel distance and a calibration value. The control device determines when a post-movement position of the moveable element is outside of a tolerance range of the target position. The control device recalibrates the calibration value when the post-movement position is determined to be outside of the tolerance range. The control device repeats the generating, the determining, and the recalibrating as open loop steps until the post-movement position is within the tolerance range or until a limit, if any, on attempts is reached.
    Type: Grant
    Filed: July 20, 2010
    Date of Patent: June 18, 2013
    Assignee: New Scale Technologies, Inc.
    Inventors: Thomas Guidarelli, David A. Henderson
  • Patent number: 8415903
    Abstract: An ultrasonic motor in which driving signals of two phases are applied to a vibrator having a driving member in contact with a driven member to simultaneously generate a longitudinal vibration and a flexural vibration, thereby generating an elliptic vibration in the vibrator, and the driving member frictionally drives the driven member upon obtaining a driving force from the elliptic vibration, is configured as follows. Namely, the ultrasonic motor includes a driving phase difference switching unit which switches a driving phase difference serving as a phase difference between the driving signals of the two phases, and changes a switching cycle of the driving phase difference.
    Type: Grant
    Filed: July 19, 2010
    Date of Patent: April 9, 2013
    Assignee: Olympus Corporation
    Inventor: Katsuhiko Yoshimura
  • Patent number: 8299733
    Abstract: A method, computer readable medium, and system for controlling velocity of an at least partially resonant actuator system in accordance with embodiments of the present invention includes determining with an actuator controller computing device a sequence of full bridge and half bridge outputs to control an output velocity of an at least partially resonant actuator device. The actuator controller computing device controls a driver system to output a driving signal based on the determined sequence of full bridge and half bridge outputs. The driver system provides the driving signal to the at least one at least partially resonant actuator device.
    Type: Grant
    Filed: October 29, 2009
    Date of Patent: October 30, 2012
    Assignees: New Scale Technologies, Inc., Austriamicrosystems AG
    Inventors: Stefan Sattler, Thomas Guidarelli
  • Publication number: 20110241576
    Abstract: An ultrasonic electro-mechanical resonant system and instrument that provides improvements in the design and implementation of a feedback system. The disclosed configuration and orientation of coils enhance the motional or velocity feedback signals while minimizing the effects of transformer coupling. A two coil and a three coil approach is disclosed that takes advantage of non-homogeneous magnetic fields. An asymmetrical arrangement enables velocity signals to be coupled into the coils without requiring additional signal conditioning or capacitive elements.
    Type: Application
    Filed: April 1, 2011
    Publication date: October 6, 2011
    Applicant: Paschke Consulting Group Inc. (PCG INC.)
    Inventor: Richard H. Paschke
  • Patent number: 7999422
    Abstract: A linear actuator includes a substantially cylindrical magnetostrictive element disposed in a housing. A retainer is cooperatively engaged with the housing and an exterior of the magnetostrictive element such that relaxed portions of the magnetostrictive element are frictionally retained in the retainer. An actuator rod is functionally coupled to one longitudinal end of the magnetostrictive element. A biasing device is disposed between the housing and the retainer to maintain the retainer in lateral compression. The actuator includes magnets arranged to induce peristaltic motion in the magnetostrictive element.
    Type: Grant
    Filed: January 19, 2010
    Date of Patent: August 16, 2011
    Assignee: Schlumberger Technology Corporation
    Inventor: Alain P. Dorel
  • Patent number: 7759966
    Abstract: A method for evaluating a permanent magnet motor, which includes a rotor with a plurality of magnets mounted thereon, and a stator with a plurality of windings in proximity to the rotor and coupled to an inverter, includes spinning the motor such that a voltage is induced in the windings of the stator and the inverter; measuring the voltage on the inverter; calculating the voltage constant from the motor from the measured voltage; comparing the voltage constant to accepted voltage constants; and identifying the motor as not acceptable if the voltage constant is outside of a range of the accepted voltage constants.
    Type: Grant
    Filed: August 25, 2008
    Date of Patent: July 20, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: William R. Cawthorne, Sean E. Gleason
  • Patent number: 7675253
    Abstract: A linear actuator includes a substantially cylindrical magnetostrictive element disposed in a housing. A retainer is cooperatively engaged with the housing and an exterior of the magnetostrictive element such that relaxed portions of the magnetostrictive element are frictionally retained in the retainer. An actuator rod is functionally coupled to one longitudinal end of the magnetostrictive element. A biasing device is disposed between the housing and the retainer to maintain the retainer in lateral compression. The actuator includes magnets arranged to induce peristaltic motion in the magnetostrictive element.
    Type: Grant
    Filed: April 11, 2007
    Date of Patent: March 9, 2010
    Assignee: Schlumberger Technology Corporation
    Inventor: Alain P. Dorel
  • Patent number: 7649378
    Abstract: A method evaluates a motor assembly having a first permanent magnet motor in a transmission of an automotive drive system at an end of manufacturing line evaluation. The first motor includes a first rotor with a first plurality of magnets mounted thereon, and a first stator with a first plurality of windings in proximity to the first rotor and coupled to a first inverter. The method includes spinning the first motor with an input dynamometer machine to a predetermined speed such that the first rotor of the first motor induces a first voltage on the first inverter; measuring the first voltage on the first inverter; calculating a first voltage constant of the first motor from the first voltage; comparing the first voltage constant to accepted voltage constants; and identifying the motor as not acceptable if the first voltage constant is outside of a range of the accepted voltage constants.
    Type: Grant
    Filed: August 25, 2008
    Date of Patent: January 19, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: William R. Cawthorne, Sean E. Gleason
  • Patent number: 7559241
    Abstract: Liquids are treated by ultrasound in a flow-through reaction vessel with an elongate ultrasonic horn mounted to the vessel with one end of the horn extending into the vessel interior. The liquid flow path inside the vessel is such that the entering liquid strikes the end of the horn at a direction normal to the end, then flows across the surface of the end before leaving the vessel. The end surface of the horn is positioned in close proximity to the entry port to provide a relatively high surface-to-volume ratio in the immediate vicinity of the horn end. In a further improvement, the horn is joined to an ultrasonic transducer through a booster block that provides an acoustic gain to the ultrasonic vibrations, and the booster block is plated with a reflective metal to lessen any loss of ultrasonic energy being transmitted to the horn.
    Type: Grant
    Filed: May 27, 2004
    Date of Patent: July 14, 2009
    Assignee: SulphCo, Inc.
    Inventor: Rudolf W. Gunnerman
  • Patent number: 7298060
    Abstract: The operational frequency of existing magnetoelectric materials having metallic or ceramic magnetostrictive materials and ceramic piezoelectric materials may be limited to a few kilohertz due to the presence of eddy-current losses in the metallic magnetostrictive phase. Further, these materials may be difficult to machine and fabricate due to their brittleness. Additionally, it may be difficult to tailor and optimize the properties (i.e., magnetoelectric voltage coefficient ?E, etc.) of the devices. This invention provides a magnetoelectric element including at least one set of alternating piezoelectric layers and magnetostrictive composite layers. The magnetostrictive composite layer includes at least one magnetostrictive material dispersed in first concentrated zones within a first polymer matrix, wherein all of the concentrated zones are orientated along a first direction. It is found that the conversion efficiency (i.e., ?E) varies in accordance with applied magnetic control field Hcontrol.
    Type: Grant
    Filed: February 21, 2007
    Date of Patent: November 20, 2007
    Assignee: The Hong Kong Polytechnic University
    Inventors: Siu Wing Or, Helen Lai Wa Chan-Wong
  • Patent number: 7275440
    Abstract: Ultrasound for use in chemical reactions is generated by an electromagnet formed from an ultrasound transducer whose central feature is a loop of magnetostrictive material wound with coils oriented to produce an oscillating magnetostrictive force when an oscillating voltage is applied. The oscillations in the transducer loop are transmitted to an ultrasonic horn that is immersed in a reaction medium where the ultrasonic vibrations are transmitted directly to the reaction mixture.
    Type: Grant
    Filed: November 18, 2004
    Date of Patent: October 2, 2007
    Assignee: Sulphco, Inc.
    Inventors: Rudolf W. Gunnerman, Charles I. Richman
  • Patent number: 7218067
    Abstract: A magnetic actuator is provided including a magnetic field-actuated material and a plurality of interconnected electrically conducting coils, each coil including a number of wire turns arranged relative to at least one other coil to produce at the magnetic field-actuated material, by superposition, a magnetic field that is substantially oriented in one of a plurality of selectable discrete directions. An actuator drive circuit is connected to the coils in a circuit configuration that reverses a direction of electrical current flow through at least one of the coils to reorient the magnetic field from a first selected direction to a second selected direction of the plurality of selectable discrete directions.
    Type: Grant
    Filed: April 4, 2005
    Date of Patent: May 15, 2007
    Assignee: Massachusetts Institute of Technology
    Inventor: Miguel A. Marioni
  • Patent number: 7002310
    Abstract: The position and speed and, in some embodiments, direction of rotation of a motor for turning the rod of an object such as a window covering is determined by placing a braking magnet next to the motor and a piezoelectric element between the braking magnet and motor. As the motor rotates, the piezoelectric element generates a signal that can be used to determine the speed of rotation and also the position of the motor (and, hence, the position of the object being moved). The magnet brakes the motor from turning under the weight of the object when the motor is deenergized.
    Type: Grant
    Filed: February 25, 2004
    Date of Patent: February 21, 2006
    Assignee: Somfy Sas
    Inventors: Pierre-Emmanuel Cavarec, Winston Glenn Walker
  • Patent number: 6897628
    Abstract: Ultrasound for use in promoting a chemical reaction is generated by an electromagnet formed from a pair of magnetostrictive prongs wound with coils that are oriented to produce an oscillating magnetostrictive force when an oscillating voltage is applied, in conjunction with a sensing electromagnet of magnetostrictive material that is arranged to receive the vibrations generated by the driving electromagnet and produce internal magnetic field changes due to the reverse magnetostrictive effect. These field changes generate voltages that are representative of the amplitude of the oscillating magnetostrictive force. The generated voltage is compared to a target value in a control circuit that adjusts the applied oscillating voltage accordingly. The oscillations in the prongs of the electromagnet are transmitted to an ultrasonic horn that is immersed in the reaction medium to provide direct contact with the reaction mixture.
    Type: Grant
    Filed: May 16, 2003
    Date of Patent: May 24, 2005
    Assignee: SulphCo, Inc.
    Inventors: Rudolf W. Gunnerman, Charles I. Richman
  • Patent number: 6888058
    Abstract: Main speakers are arranged on the enclosure front surface of an electronic piano. Auxiliary speakers (18L, 18R) are arranged on the rear surface of the enclosure. Microphones are arranged in close proximity of the main speakers. A performance sound is regenerated from the main speakers. The regenerated sound from the main speakers is picked up by microphones (20L, 20R). FIR filters are used to generate the reflected signal of a picked-up sound signal from the microphones. The generated reflected sound signal is regenerated from auxiliary speakers.
    Type: Grant
    Filed: January 10, 2003
    Date of Patent: May 3, 2005
    Assignee: Yamaha Corporation
    Inventors: Tomomitsu Urai, Shinichi Sawara, Fukushi Kawakami
  • Patent number: 6803738
    Abstract: Magnetic forces are used as a controlled actuation mechanism to move and position objects of interest. In one embodiment, a first spherical surface has at least one magnetic positioner attached. A second spherical surface is positioned to move relative to the first spherical surface. A plurality of controlled electromagnets are spaced about the second spherical surface. Control logic energizes at least one of the controlled electromagnets to create magnetic interaction with at least one magnetic positioner to move the first spherical surface relative to the second spherical surface.
    Type: Grant
    Filed: October 12, 2001
    Date of Patent: October 12, 2004
    Assignee: Clarity, LLC
    Inventor: Gamze Erten
  • Patent number: 6720684
    Abstract: A method of controlling the amount of magnetostriction in a magnetostrictive actuator is provided. The method compensates for non-ideal influences, such as imperfections in the magnetostrictive member, prestress, stress or load, quality of the magnetic circuit, and temperature. The method includes selectively energizing the coil to build and maintain a current for generating the magnetizing force; measuring the magnetic flux; and applying the magnetic flux as a feedback variable to control the magnetizing force and thereby control the amount of magnetostriction.
    Type: Grant
    Filed: March 22, 2001
    Date of Patent: April 13, 2004
    Assignee: Siemens Automotive Corporation
    Inventor: Perry Robert Czimmek
  • Patent number: 6617754
    Abstract: The invention relates to a circuit arrangement for the dynamic control of ceramic solid-state actuators, such as piezotranslators with energy recovery by means of magnetic intermediate stores and/or storage capacitors as well as by clocked switches. For achieving a predetermined linear voltage characteristic at the piezotranslator, according to the invention, a single inductive intermediate store is arranged in the secondary circuit, which is connected in series with the piezotranslator, and the secondary circuit is designed as a half-bridge. The switches provided in the respective half-bridge are controlled at a high cycle or switching frequency by an external controller, with the series connection of piezotranslator and inductive intermediate store furthermore carrying a superimposed bridge direct current in order to ensure the desired charging of the capacitance of the piezotranslator, on the one hand, and to optimize the energy recovery, on the other hand.
    Type: Grant
    Filed: December 22, 2000
    Date of Patent: September 9, 2003
    Assignees: GSG Elektronik GmbH, Physik Instrumente (PI) GmbH & Co.
    Inventor: Uwe Knauss
  • Patent number: 6489695
    Abstract: The efficiency of converting electrical energy into a mechanical output is maximized by alternatively matching selection of power supply for the drive coil applying a magnetic field to transducer element made of a magnetostrictive material having a near-zero magnetic anisotropy, or matching selection of the magnetostrictive material to the required magnetostriction for a given power supply.
    Type: Grant
    Filed: January 24, 2001
    Date of Patent: December 3, 2002
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Marilyn Wun-Fogle, James B. Restorff, Arthur E. Clark
  • Patent number: 6410999
    Abstract: Actuator elements of a motor system are cyclically expanded magnetostrictively by energization of excitation coils to impart driving forces directly to a driven load through roller sprag means under preload bias in locking contact with a race formation in the driven load, to impart unidirectional movement to the driven load in one direction selected by generated Lorentz forces through magnetic field controlling means, as well as to provide power-off braking.
    Type: Grant
    Filed: November 9, 2000
    Date of Patent: June 25, 2002
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: John M. Vranish, Joseph P. Teter
  • Patent number: 6328566
    Abstract: A color coding system and method for visually identifying and distinguishing ultrasonic dental tool inserts. The invention employs a color-coded removable cap that is used to secure a handgrip, which can also be color-coded, to the insert. The caps and/or handgrips of different inserts thus have different colors to visually distinguish one insert or type of insert from another.
    Type: Grant
    Filed: March 7, 2001
    Date of Patent: December 11, 2001
    Inventor: James Feine
  • Patent number: 6246132
    Abstract: A magnetostrictive actuator, comprising: a magnetostrictive member which elongates upon application of a magnetic field; a translating member mechanically coupled to the magnetostrictive member, for translating the change in length of the magnetostrictive member into a desired action; and a selectively-energized coil surrounding the magnetostrictive member, to apply a magnetic field to the magnetostrictive member, and thus selectively change the length of the magnetostrictive member, and thereby cause the translating member to create the desired action.
    Type: Grant
    Filed: December 29, 1998
    Date of Patent: June 12, 2001
    Assignee: Energen, Inc.
    Inventors: Chandrashekhar H. Joshi, Bruce R. Bent
  • Patent number: 6188186
    Abstract: A circuit and method for driving a magnetostriction oscillator which is used for generating a high output ultrasonic wave by using a pulse width modulation is provided. In the circuit, a controller outputs first and second variable digital signals in order to control a duty cycle of a magnetostriction oscillator. A pulse width modulating circuit generates a variable pulse width modulating signal based on the first and second variable digital signals from the controller. A driver drives the magnetostriction oscillator according to the variable pulse width modulating signal from the pulse width modulating circuit. According to the circuit, the system operates for a long time so that stability of equipment can be obtained. The circuit uses low voltage and low energy so that efficiency of the system is promoted.
    Type: Grant
    Filed: October 8, 1999
    Date of Patent: February 13, 2001
    Assignee: Jobang Electronics Co., Ltd.
    Inventors: Jung-Sil Kong, Yong-Rae Roh
  • Patent number: 6084363
    Abstract: A drive pulse generating apparatus capable of freely adjusting drive speed of a drive device using an electromechanical transducer for adjusting the width of a rising portion and the width of a falling portion of a sawtooth waveform pulse having a gradual rising portion and a steep falling portion or a steep rising portion and a gradual falling portion by adjusting waveform of a drive pulse or combining drive pulses having different waveforms of a sine waveform, a sawtooth waveform and the like by which the drive speed of the drive device using the electromechanical transducer is freely adjusted.
    Type: Grant
    Filed: January 16, 1998
    Date of Patent: July 4, 2000
    Assignee: Minolta Co., Ltd.
    Inventor: Kenji Mizumoto
  • Patent number: 5980251
    Abstract: A magnetostrictive transducer including a plurality of magnetostrictive laminates each having a first end and a second end. The first and second ends of the laminates include openings. The laminates are arranged in a stacked configuration and bonded together by solder at the first and second ends. At the first and second ends the solder extends through the openings of the laminates forming a solder bar therein. The solder bars bond the laminates together with increased mechanical strength and also provide increased electrical contact between the laminates.
    Type: Grant
    Filed: August 5, 1997
    Date of Patent: November 9, 1999
    Assignee: Coltene/Whaledent, Inc.
    Inventors: John Sullivan, Steven Abdelqader
  • Patent number: 5754016
    Abstract: The invention provides a method of operating a dental scalar system having a vibrating scaling tip by continuously monitoring the amplitude and frequency of vibration of the tip which provides scaling power to a tooth in a patient's mouth. The amplitude and frequency of vibration of the tip is continuously adjusted to maintain a substantially constant scaling power. Preferably, the insert is vibrated at its resonant frequency and the system provides a substantially constant tip motion while the user varies the applied pressure between the tip and the tooth.
    Type: Grant
    Filed: September 18, 1996
    Date of Patent: May 19, 1998
    Assignee: Dentsply Research & Development Corp
    Inventors: Vidan Jovanovic, Alfred E. Corbellini, Emery Rose, George Warrin, Richard Paschke
  • Patent number: 5705863
    Abstract: A linear actuator having a magnetostrictive rod is magnetically energized der analog logic control in operative relation to a pair of electrically disengaged one-way locking devices, one of which is interconnected with the actuator through a stroke multiplier for high force, high speed motor drive. Two stage operation of the stroke multiplier is effected through levers angularly displaced by angular deformation of the magnetostrictive rod about a pivotal axis offset from the rod axis by means of a flexible support for such levers to avoid wear and backlash.
    Type: Grant
    Filed: May 2, 1995
    Date of Patent: January 6, 1998
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Joseph P. Teter
  • Patent number: 5703553
    Abstract: A magnetostrictive active member configured to withstanding significant bending moments and having a prestress mechanism that is adjustable for maintaining optimal performance of an integral magnetostrictive element. The magnetostrictive active member includes a magnetostrictive actuator and parallel flexures incorporated in a housing to create a load path for bending moments to be carried by the housing, through the parallel flexures, as opposed to being carried by the magnetostrictive actuator. A plurality of ball-joints are integrated with the flexures and magnetostrictive actuator, receiving compressire forces and ensuring that no moments are applied to the magnetostrictive actuator. A prestress or preload mechanism is incorporated which provides a compressire preload to the magnetostrictive actuator internal to the housing. The preload mechanism includes an adjustable nut than is externally accessible to adjust the preload and facilitate optimal performance of the magnetostrictive actuator.
    Type: Grant
    Filed: May 24, 1996
    Date of Patent: December 30, 1997
    Assignee: SatCon Technology, Corp.
    Inventors: Dariusz Antoni Bushko, Kevin Michael Avakian, Bruce Graham Johnson, Michael Jonathan Gerver
  • Patent number: 5701043
    Abstract: A magnetostrictive material is used to reduce a displacement by a factor of about 1000 to achieve displacements with subnanometer resolution. The range of motion is about 100 .mu.m. In one embodiment, a longitude of a magnetostrictive material is attached end to end to a soft magnetic material of same shape and permeability. A magnet provides a magnetic field of constant intnesity and length along half of the combined longitude. When the magnet is displaced along the combined longitude, the length of the magnetic field inside the magnetostrictive material changes. This change is accompanied by an equal and opposite change in the magnetic material, and therefore, the magnetic circuit remains undisturbed. The result is a linear and hysteresis free change in the expansion or contraction of the magnetostrictive material, and displacement of one of its ends relative to the other.
    Type: Grant
    Filed: September 9, 1996
    Date of Patent: December 23, 1997
    Inventor: Mahmoud Razzaghi
  • Patent number: 5317223
    Abstract: Method and device for making a first body (8), having a magnetostrictive properties, and a second body (6), against which said first body is in bearing contact with a certain grip between the contact surfaces, to move with respect to each other while substantially maintaining said grip. According to the invention a magnetic field is made to sequentially influence only one of adjacent partial sections of said magnetostrictive body (8), starting from the front end of the body as seen in the intended direction of movement. The magnetic field is adjusted so that the respective partial section under the influence of the magnetic field undergoes an increase in length, at the same time being subject to a contraction in the transverse direction which is big enough in order to decrease, preferably eliminate the grip between the bodies. The device includes a rod (8) of magnetostrictive material, which is clamped within a tubular body (6), one end of which being attached to a rigid supporting structure.
    Type: Grant
    Filed: December 10, 1990
    Date of Patent: May 31, 1994
    Assignee: Dynamotive Corporation
    Inventors: Lothar E. Kiesewetter, Fredy Olsson, Carl H. Tyren
  • Patent number: 5270595
    Abstract: A magnetostrictive linear actuator, responsive to an external signal, including a housing assembly that encloses a magnetostrictive force train assembly, an excitation means disposed on a component of one assembly, as well as a thermal compensation means disposed on a component of the complementary assembly, and a controller means responsive to the external signal which provides a heat control signal in dependence on the magnitude of the controller signal such that the thermal expansion of the assembly heated by the excitation means will be compensated by a matching thermal expansion induced in the complementary assembly.
    Type: Grant
    Filed: October 2, 1984
    Date of Patent: December 14, 1993
    Assignee: United Technologies Corporation
    Inventor: George R. Wisner
  • Patent number: 5249117
    Abstract: An adaptive controller employing variable structure techniques being particularly applicable to the control of processes operated by a magnetostrictive actuator.The problem of accommodating the non-linearity and hysteresis in the magnetostrictive actuator's response is solved by this design of controller. Examples of the uses of a controller-magnetostrictive actuator combination include control of hydraulic valves and anti-vibration tables.
    Type: Grant
    Filed: February 10, 1992
    Date of Patent: September 28, 1993
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Rodney D. Greenough, Gordon A. Jenner, Ahmed Parvinmehir, Anthony J. Wilkinson
  • Patent number: 5184037
    Abstract: A magnetstriction type actuator is capable of reducing an input power loss and increasing an output, which actuator is reduced in size and is applicable to a vibrator.
    Type: Grant
    Filed: February 22, 1991
    Date of Patent: February 2, 1993
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tadahiko Kobayashi, Masashi Sahashi
  • Patent number: 5172020
    Abstract: A magnetic core employed in AC motors, transformers and the like includes a first core portion formed by laminating silicon steel sheets each containing 3.5% silicon, the first core portion having two ends in the direction that the sheets are laminated, and second core portions disposed at the respective ends of the first core portion and formed by laminating silicon steel sheets each containing 6.5% silicon. In distorted wave alternating field, low frequency fluxes pass through the first core portion and harmonic fluxes pass through the second core portions. Since each second core portion has a low level of magnetostriction, the magnetic noise due to the harmonics is reduced.
    Type: Grant
    Filed: December 18, 1990
    Date of Patent: December 15, 1992
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Sadayoshi Hibino, Motoyasu Mochizuki, Tadayuki Sato
  • Patent number: 5165131
    Abstract: A teeth cleaning apparatus has a brush pivotally mounted in a brush holder. The brush has a teeth cleaning member such as bristles formed thereon. A vibrator exerts a vibratory force on the brush so that the teeth cleaning member moves back and forth in substantially its axial direction. The vibrator is driven by an electrical signal which preferably is of a frequency between 1,000 and 17,000 Hz and includes an audio frequency component of mixed frequency and amplitude representing music or other pleasant sounds which is transmitted to the auditory system of a person while brushing.
    Type: Grant
    Filed: December 28, 1990
    Date of Patent: November 24, 1992
    Assignee: Staar Development Co., S.A.
    Inventor: Marcel J. H. Staar
  • Patent number: 5159253
    Abstract: The present invention relates to a vibration wave motor of the type in which an electro-mechanical energy conversion element is disposed on a vibration member and a frequency voltage is applied to the element to form a travelling vibration wave on the vibration member and a moving member is driven by the vibration wave. In the present invention, when the motor has assumed a resonance or the vicinity thereof when speed adjustment is being effected with the frequency of the periodic voltage changed, the change of the frequency to any frequency exceeding the then frequency is inhibited so that the drive frequency is not changed to a value exceeding the resonance frequency.
    Type: Grant
    Filed: June 25, 1991
    Date of Patent: October 27, 1992
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masao Shimizu, Nobuyuki Suzuki
  • Patent number: 5150492
    Abstract: An ultrasonic toothbrush for use in personal dental hygiene care includes an exchangeable ultrasonic implement which may be rigidly and removably mounted to ultrasonic power means and readily removed therefrom with a relatively small separating force. Provision is made for coupling the toothbrush to the power means and is arranged to transfer the ultrasonic energy from the power means to the ultrasonic implement with the power means remaining substantially free from absorbing ultrasonic energy as the vibratory energy is transmitted therethrough.
    Type: Grant
    Filed: February 8, 1991
    Date of Patent: September 29, 1992
    Inventor: Leonard W. Suroff