Patents Examined by Judson H. Jones
  • Patent number: 7042118
    Abstract: A rotor construction may comprise a rotor with a centrally located permanent magnet section having aligned magnet segments and having a central hole throughout its length. A thin rod of magnetic steel is located in this central hole to support the permanent magnets from within. At each end of the rod are located threaded sections for attachment to supporting end stubs. A high strength steel sleeve is interference fit over both the magnets and the end stubs to provide a mechanical link from stub to stub. The guide rod insures that the end stubs and central magnet are concentric during initial processing, prevents relative motion between the rotor components and provides support for the magnet once the sleeve is installed.
    Type: Grant
    Filed: November 10, 2003
    Date of Patent: May 9, 2006
    Assignee: Calnetix
    Inventors: Patrick T. McMullen, Co Si Huynh
  • Patent number: 7038334
    Abstract: A high precision laser machining apparatus having a horizontal translation axis (z-axis) and a rotary axis (theta-axis) parallel with the translation axis comprises parallel spaced apart linear translation stages, a carriage supported between the parallel translation stages, and a rotation stage carried by the carriage between the parallel translation stages. Mounted on the same base plate is a laser optics support stage and a workpiece advance mechanism.
    Type: Grant
    Filed: March 1, 2005
    Date of Patent: May 2, 2006
    Assignee: Aerotech, Inc.
    Inventors: Stephen J. Botos, Brian P. O'Connor
  • Patent number: 7034428
    Abstract: An electric machine having multi-set rectangular copper hairpin windings comprises a stator having a plurality of partially closed stator slots. A first winding set and a second winding set are positioned in the stator slots. The first winding set and the second winding set are connected by adjacent leg ends. According to a first embodiment, conductor layers in alternate slots alternate between different phases. The conductor layers in the remaining slots are all of the same phase. Hairpins having unequal length legs are used to implement the first embodiment. According to a second embodiment, conductor layers in alternate slots include one phase for the first winding set and another phase for the second winding set. The conductor layers in the remaining slots are all of the same phase. Hairpins having equal length legs are used to implement the second embodiment.
    Type: Grant
    Filed: May 16, 2005
    Date of Patent: April 25, 2006
    Assignee: Remy, Inc.
    Inventors: Wei Cai, David Fulton, Christopher L. Congdon
  • Patent number: 7034415
    Abstract: A magnetic drive for providing pivotal motion to a functional surface, such as a mirror. The magnetic drive may be used to drive any torsional hinged device, but is particularly suitable for driving a torsional hinged mirror. According to a first embodiment, a dual axis functional surface uses a first pair of torsional hinges to provide primary movement to the functional surface and a second pair of torsional hinges provides movement orthogonal to the primary movement to allow positioning in two directions. The mass and movement of inertia of the functional surface is reduced by relocating permanent magnet sets to the axis of rotation. The reduced mass and movement of inertia results in a stiff robust hinge having a resonant frequency above about 120 Hz.
    Type: Grant
    Filed: October 9, 2003
    Date of Patent: April 25, 2006
    Assignee: Texas Instruments Incorporated
    Inventors: Arthur Monroe Turner, Andrew Steven Dewa, John W. Orcutt, Mark W. Heaton
  • Patent number: 7034474
    Abstract: A stage assembly (220) for moving a device (200) includes a stage (208), an attraction-only type actuator pair (426) that moves the stage (208), and a control system (24). In one embodiment, the actuator pair (426) includes a first electromagnet (436F), a first conductor (438F) and a first target (440F) having a first target surface (442F). The actuator pair also includes a second electromagnet (436S), a second conductor (438S) and a second target (440S) having a second target surface (442S). The first electromagnet (436F) is positioned at a first angle ?1 relative to a first target surface (442F) and the second electromagnet (436S) is positioned at a second angle ?2 relative to the second target surface (442S). The control system (24) directs a first current to one or more of the electromagnets based on at least one of the angles ?1, ?2. Further, one or more electromagnets (436) can include a first measurement point and a second measurement point.
    Type: Grant
    Filed: February 9, 2004
    Date of Patent: April 25, 2006
    Assignee: Nikon Corporation
    Inventors: Pai Hsueh Yang, Tim Teng, Kazuhiro Hirano, Bausan Yuan
  • Patent number: 7030531
    Abstract: An electric motor operated by AC current, that includes a stator and a rotor supported for rotation about an axis relative to the stator. The stator is provided with field windings angularly distributed about the rotor axis and capable of producing a magnetic field vector in the space of the rotor. Circuitry delivers AC current to the windings in a manner that produces an AC magnetic field vector that moves around the axis of the rotor. The rotor has a construction, such as an axially extending conductive loop, that changes its reluctance in the AC magnetic field depending on its orientation to the AC magnetic field vector whereby the rotor is caused to rotate in synchronization with the movement of the AC magnetic field vector.
    Type: Grant
    Filed: May 3, 2005
    Date of Patent: April 18, 2006
    Inventor: Lambert Haner
  • Patent number: 7030518
    Abstract: A position-control stage is disclosed which makes it possible to extend largely an angular movement in circular direction for position control, rendering the stage itself compact in construction, allowing to work with high precision in clean environment and further produce the stage with inexpensive cost. The position-control stage has an onboard linear motor composed of armature windings of primary side and field magnets of secondary side. The armature windings are each made in a hollow rectangle where winding turns are wound in the form of flat loop, and are circularly arranged on a disc surface of the bed along a preselected curvature in such a way lying in radial juxtaposition in circumferential direction. The field magnets are made in a flat shape and arranged underneath the turntable in such a pattern lying radially on a disc surface of the preselected curvature in opposition to the armature windings, with their unlike poles alternating in polarity along a circular direction.
    Type: Grant
    Filed: July 18, 2003
    Date of Patent: April 18, 2006
    Assignee: Nippon Thompson Co., Ltd.
    Inventors: Takaaki Tsuboi, Eiji Ida, Yoshihiko Kanazawa
  • Patent number: 7030519
    Abstract: An electrodynamic actuator has a permanently magnetic stationary part that forms an air-core with a magnetic field, and an armature with a coil arranged in the air-core. The armature moves in the magnetic field in the air-core dependent on a drive current fed to the coil. An increased accuracy is achieved by the provision of damping in relation to the speed of the armature, by arranging a sensing winding on the armature and connecting a calculation unit to the sensing winding. The calculation unit determines the speed of the armature from an induced voltage in the sensing winding caused by a movement of the armature in the magnetic field.
    Type: Grant
    Filed: November 5, 2003
    Date of Patent: April 18, 2006
    Assignee: Maquet Critical Care AB
    Inventor: Bruno Slettenmark
  • Patent number: 7026731
    Abstract: The present invention provides a linear motor and glide assembly for mounting a linear motor employing a unitary bearing rail structure and further providing heat compensation and compensation for thermal expansion, with further compensation provided to substantially reduce cogging.
    Type: Grant
    Filed: June 20, 2003
    Date of Patent: April 11, 2006
    Assignee: Parker Hannifin Corp.
    Inventor: Bruce Beakley
  • Patent number: 7023112
    Abstract: A vibrating device has an axially elongated frame, and a vibrating assembly including a hollow yoke. A magnetic driving device is provided for axially vibrating the vibrating assembly. A supporting shaft is provided for axially slidably supporting the vibrating assembly in the frame.
    Type: Grant
    Filed: January 10, 2003
    Date of Patent: April 4, 2006
    Assignee: Citizen Electronics Co., Ltd.
    Inventors: Kazumi Miyamoto, Kenshi Aihara, Naoki Miura
  • Patent number: 7019421
    Abstract: A linear motor system including compartmentalized stator sections provides an interchangeable and serviceable alternative to other linear motors. The stator sections may be individually-energized so that power is only sent to stator sections adjacent to the thrust plate or rotor of the linear motor. A sufficiently long thrust plate is used to cover any gaps in the linear stator, and additional compensation stator sections are used to provide additional motor force to the thrust plate adjacent to these gap sections. If utilized onboard a ship, additional compensation stator sections may be incorporated into the face of deck hatches. The linear motor system can also be used to counteract gravitational effects in a large hanging door system implementation.
    Type: Grant
    Filed: February 20, 2004
    Date of Patent: March 28, 2006
    Assignee: Curtiss-Wright Electro-Mechanical Corporation
    Inventors: David J. Hall, Thomas A. Lemak, Regis J. Hillenbrand
  • Patent number: 7015622
    Abstract: The present invention discloses a control apparatus for a vibration type actuator that can perform the drive of a driven member in a short time. The control apparatus for a vibration type actuator that excites vibration in a vibration body by applying a frequency signal to an electro-mechanical energy converting element and relativity moves the vibration body and a contact body contacting to this vibration body includes a determination unit determining the drive direction of the vibration type actuator, and a frequency setting unit modifying a frequency of the frequency signal according to whether the drive direction of the vibration type actuator determined by the determination unit is the same as or reverse to the last drive direction at the startup of the vibration type actuator.
    Type: Grant
    Filed: April 15, 2005
    Date of Patent: March 21, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takayuki Endo
  • Patent number: 7012345
    Abstract: The present invention provides an electromagnetic drive motor assembly (EDMA) that has an inner flux return assembly formed from an upper pole piece and a lower pole piece oppositely disposed relative to each other along the center of the EDMA. An annularly positioned conductive ring (or flux stabilization ring) encircles the inner flux return assembly, concentrically in contact with the outside of the inner flux return assembly. Along the exterior side of the flux return pieces, is a magnet that is between a top plate and a bottom plate. Each plate contacts with the magnet to form a magnetically conductive system. A magnetic gap is formed in between the inner flux return assembly and the top and bottom plates. Disposed within the magnetic gap is a dual coil wound around a cylinder. The dual coil includes a first coil portion and a second coil portion. To minimize the modulation, the top and bottom plates may be saturated and plate tips may be provided near the magnetic gap.
    Type: Grant
    Filed: June 29, 2004
    Date of Patent: March 14, 2006
    Assignee: Harman International Industries, Inc.
    Inventors: Jerry Moro, Douglas J. Button
  • Patent number: 7005810
    Abstract: An apparatus for driving a linear vibration motor that employs a proper motor thrust constant value corresponding to each linear vibration motor at position calculation for obtaining the position of the mover of the linear vibration motor, thereby increasing the accuracy of the position calculation. This motor driving apparatus includes a motor driver for applying a DC voltage to the linear vibration motor, and a thrust detection unit for detecting a thrust of the mover, which is generated by the application of the DC voltage to the linear vibration motor, and calculates the thrust constant of the linear vibration motor according to an arithmetic operation of dividing the mover thrust detected by the thrust detection unit, by a value of a DC current that is supplied to the linear vibration motor due to the application of the DC voltage to the linear vibration motor.
    Type: Grant
    Filed: February 20, 2004
    Date of Patent: February 28, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Mitsuo Ueda, Hideki Nakata, Makoto Yoshida
  • Patent number: 7005811
    Abstract: A vibration generator system is capable of generating vibrations of a frequency that can be bodily sensed by humans, notwithstanding a small size, and making setting of a configuration of vibrations easy. When a drive signal composed of a set of an accumulation signal and a damping signal is given as a natural frequency of a movable body, a vibrational waveform of the movable body makes an envelope. Since a frequency of the envelope is in a lower frequency band than the natural frequency of the movable body, humans can surely sense vibrations. When the number of and a current quantity of excitation signals and reverse excitation signals included in the accumulation signal are changed and the number of and a current quantity of inhibition signals and reverse inhibition signals included in the damping signal are changed, the envelope can be changed in frequency and amplitude, so that it becomes possible to generate a variety of vibrations.
    Type: Grant
    Filed: November 19, 2003
    Date of Patent: February 28, 2006
    Assignee: Alps Electric Co., Ltd.
    Inventors: Hiroshi Wakuda, Takahiro Kawauchi
  • Patent number: 7005766
    Abstract: In a motor portion of a linear actuator, a rear end cap and a front end protrusion, which are disposed respectively at the rear and front ends of a stator assembly, and which include rear and front bearings to rotatably support a rotor assembly, are formed by injection-molding simultaneously and integrally with a stator support member which fixedly supports constituent members of the stator assembly, whereby the stator assembly, the rear end cap, and the front end protrusion can be coaxially aligned to one another with a high degree of precision thus improving the assembling precision of the motor portion. Also, since the front bearing can be attached to the front end protrusion before an output shaft is attached, the rotation characteristic of the rotor assembly can be evaluated before the output shaft is attached.
    Type: Grant
    Filed: February 24, 2004
    Date of Patent: February 28, 2006
    Assignee: Minebea Co., Ltd.
    Inventors: Yuzuru Suzuki, Taketoshi Ohyashiki, Kazuo Muramatsu
  • Patent number: 7004694
    Abstract: The conventional linear drive apparatus has the problem that in constructing a linear motor of a multiphase structure by connecting a plurality of armature units, the length of the armature becomes longer in proportion to the number of the phases, thus limiting the locations where the apparatus can be installed. The problem is solved by a linear drive apparatus comprising a plurality of armature units 3 formed by a magnetic material on which a conductor coil 4 is disposed, and an armature comprising an arrangement of the armature units 3. The armature units 3 comprise a plurality of opposing portions having opposing magnetic pole teeth. The magnetic pole teeth of adjacent opposing portions are arranged in an interdigitated manner. A secondary member 6 is disposed between magnetic pole teeth of the opposing portions. The armature units 3 comprise the coil 4 arranged on opposite sides thereof in an alternating manner.
    Type: Grant
    Filed: August 13, 2003
    Date of Patent: February 28, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Houng Joong Kim, Kohji Maki, Hisao Tadokoro, Hideki Shimane, Hitoshi Shibata, Keijiro Sakai
  • Patent number: 6998737
    Abstract: A magnetic field distribution for a planar motor is described. The magnetic field distribution can either be generated by means of permanent magnets or one or more current carrying conductor. The planar motor can be applied in a lithographic apparatus for displacing an object table along a first direction and a second direction perpendicular to the first direction. The particular arrangement of permanent magnets or current carrying conductor(s) may result in an improved efficiency of the planar motor in one of said first or second directions.
    Type: Grant
    Filed: October 9, 2003
    Date of Patent: February 14, 2006
    Assignee: ASML Netherlands B.V.
    Inventor: Robrecht De Weerdt
  • Patent number: 6998738
    Abstract: A plain surface stage apparatus includes a platen having a plain surface, stationary type supports comprising at least three supporting members, and displacement type supports, each of which supports the platen and forms a displacement type supporting point at a position other than those of supporting points formed by the stationary type supports, wherein the displacement type supports expand and contract in a direction perpendicular to the plain surface of the platen so as to be displaced, and holds a selected displaced state of the displacement type supports.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: February 14, 2006
    Assignee: Ushio Denki Kabushiki Kaisha
    Inventor: Yoneta Tanaka
  • Patent number: 6998736
    Abstract: An apparatus and method for controlling driving of a linear motor, which is configured to increase efficiency of a linear compressor and stably drive the linear motor when the linear motor is overloaded. The apparatus includes a detector that detects a current applied to a motor, a controller that outputs a control signal based on the detected current and a switch that varies the number of windings of the linear motor coil on the basis of the control signal.
    Type: Grant
    Filed: August 28, 2003
    Date of Patent: February 14, 2006
    Assignee: LG Electronics Inc.
    Inventors: Jae-Mo Lee, Kyung-Bum Heo