Patents Examined by Judson H. Jones
  • Patent number: 6954040
    Abstract: A free piston gas compressor comprising a cylinder, a piston reciprocable within the cylinder and a reciprocating linear electric motor derivably coupled to the piston having at least one excitation winding. A measure of the reciprocation time of the piston is obtained, any change in the reciprocation time is detected and the power input to said excitation winding is adjusted in response to any detected change in reciprocation time.
    Type: Grant
    Filed: July 26, 2004
    Date of Patent: October 11, 2005
    Assignee: Fisher & Paykel Appliances Limited
    Inventors: Ian McGill, Zhuang Tian
  • Patent number: 6952086
    Abstract: A control system for a linear motor adapted to accurately supply a moving window of power to the stator coils. A plurality of individually switched stator coils run the length of a linear motor to move a rotor down the long axis of the stator. Accurate inductive-based position sensors continuously provide position data for the moving rotor. A processing unit calculates a proper time delay from a source voltage peak in order to apply power to the next stator coil in the moving direction of the rotor such that no DC offshoot/undershoot occurs. The linear motor control system optionally includes a failure prevention switching scheme in which pairs of individual stator coils on opposite sides of a double-sided stator are switched together.
    Type: Grant
    Filed: October 10, 2003
    Date of Patent: October 4, 2005
    Assignee: Curtiss-Wright Electro-Mechanical Corporation
    Inventors: Mark Peter Krefta, David Jonathan Hall, Kenneth Martin Eichler, Jiing-Liang Wu, Robert E. Strickler, Michael Barnaby Brennen
  • Patent number: 6949844
    Abstract: A high-speed precision positioning apparatus has a stage supported by a platen. The stage is driven by a plurality of drive motors that are co-planar with the stage and arranged symmetrically around the stage. The drive motors apply drive forces directly to the stage without any mechanical contact to the stage. The drive forces impart planar motion to the stage in at least three degrees of freedom of motion. In the remaining three degrees of freedom the motion is constrained by a plurality of fluid bearings that operate between the stage and the platen. The drive motors are configured as magnets, attached to the stage, moving in a gap formed in-between top and bottom stationary coils. Integral force cancellation is implemented by a force cancellation system that applies cancellation forces to the stage. The cancellation forces, which are co-planar with a center of gravity of the stage and any components that move with the stage, cancel forces generated by planar motion of the stage.
    Type: Grant
    Filed: December 29, 2003
    Date of Patent: September 27, 2005
    Assignee: GSI Group Corporation
    Inventors: Steven P. Cahill, Bradley L. Hunter
  • Patent number: 6949860
    Abstract: In an electric motor in which a magnet holder is provided in an inner periphery of a yoke, and a terminal insertion hole is provided in a feed connector provided in a brush holder. A terminal connected to a brush is inserted to the terminal insertion hole, and the yoke and the brush holder are connected. An engagement portion is provided in the terminal, a convex portion is provided in an end surface of the magnet holder, and the convex portion of the magnet holder is allowed to be engaged with the engagement portion of the terminal under a state in which the yoke and the brush holder are connected.
    Type: Grant
    Filed: September 5, 2003
    Date of Patent: September 27, 2005
    Assignee: Showa Corporation
    Inventors: Yohei Hama, Akira Fujisaki
  • Patent number: 6946756
    Abstract: An oscillatory linear actuator including a plurality of movable elements configured to move in a linear direction, a stationary component configured to drive the plurality of movable elements to move in the linear direction, and a plurality of connecting devices elastically connecting the plurality of movable elements with each other and positioned on at least one end portion of the plurality of movable elements in the linear direction, each of the plurality of connecting devices being extending away from the plurality of movable elements in opposite directions.
    Type: Grant
    Filed: June 17, 2003
    Date of Patent: September 20, 2005
    Assignee: Matsushita Electric Works, Ltd.
    Inventors: Hiroaki Shimizu, Hidekazu Yabuuchi, Masashi Moriguchi, Noboru Kobayashi, Ryo Motohashi, Ryuji Otani
  • Patent number: 6946770
    Abstract: In an electric motor having a brush holding portion for holding a brush and a pigtail holding means for holding a pigtail connected to the brush, on a holder surface of a brush holder, the pigtail holding means holds the pigtail in both a lateral direction along the holder surface and a longitudinal direction crossing to the holder surface.
    Type: Grant
    Filed: September 5, 2003
    Date of Patent: September 20, 2005
    Assignee: Showa Corporation
    Inventors: Yohei Hama, Akira Fujisaki
  • Patent number: 6946754
    Abstract: A linear motor includes a stator including a stator core for forming plural magnetic poles and a magnetic wire mounted on the stator core, and a mover provided at the interior of the stator and including a mover core and a magnet mounted on the outer side of the mover core. The linear motor has the magnet have a reduced mass, thus having a small size, a low overall cost, and a high operating efficiency.
    Type: Grant
    Filed: January 21, 2003
    Date of Patent: September 20, 2005
    Assignee: Matsushita Refrigeration Company
    Inventors: Ko Inagaki, Ichiro Morita
  • Patent number: 6946755
    Abstract: A small and high rigid linear motor (1), wherein a tabular heat pipe (7) is disposed between a plurality of coil rows forming an armature coil (6) along the longitudinal direction of an armature (5) with a part of the heat absorbing part of the heat pipe (7) fixed to the armature coil (6) and the heat radiating part thereof inserted into a refrigerant passage (11), a block-shaped locking member (8) for fixing the heat pipe (7) to a frame (10) is installed between the portion of the heat pipe (7) for fixing the armature coil thereto and the portion thereof inserted into the refrigerant passage (11), and a hollow recessed part (10a) forming the refrigerant passage (11) and allowing die insertion of the heat radiating part of the heat pipe (7) therein and a locking step part (10c) allowing the locking of the frame (10) to the locking member (8) installed on the heat pipe are provided in the frame (10), whereby the heat of the armature coil can be efficiently transferred to the frame, and the thrust of a rotor ca
    Type: Grant
    Filed: November 19, 2001
    Date of Patent: September 20, 2005
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Masafumi Tamai, Ryuichirou Tominaga, Fumihiro Tara, Yoshiaki Kubota, Takao Fujii
  • Patent number: 6940190
    Abstract: An electric machine including a first member and a second member. The second member is movable in relation to the first member. The first member has at least one coil and the first and the second members both include a plurality of segments, where each segment of the first member comprises a plurality of sections have a first magnetic conducting material. Each segment of the second member includes a plurality of sections having a second magnetic conducting material, and in which the first and the second member includes a closed magnetic circuit.
    Type: Grant
    Filed: June 18, 2004
    Date of Patent: September 6, 2005
    Assignee: Volvo Technology Corporation
    Inventors: Edward Jobson, Erland Max
  • Patent number: 6936940
    Abstract: A motor includes a stator and a rotor having drive permanent magnets and a rotary shaft. The stator supports a core with coils wound thereon and includes a base plate. The base plate is formed with a resin, and is composed of a core supporting section that supports the core, a shaft supporting section that rotatably supports the rotary shaft, and attachment sections for attaching the motor to an apparatus. The core supporting section, the shaft supporting section and the attachment sections of the base plate are formed in one piece.
    Type: Grant
    Filed: April 29, 2003
    Date of Patent: August 30, 2005
    Assignee: Sankyo Seiki Mfg. Co., Ltd.
    Inventors: Kazutaka Kobayashi, Makoto Akabane
  • Patent number: 6933629
    Abstract: An active balance system is provided for counterbalancing vibrations of an axially reciprocating machine. The balance system includes a support member, a flexure assembly, a counterbalance mass, and a linear motor or an actuator. The support member is configured for attachment to the machine. The flexure assembly includes at least one flat spring having connections along a central portion and an outer peripheral portion. One of the central portion and the outer peripheral portion is fixedly mounted to the support member. The counterbalance mass is fixedly carried by the flexure assembly along another of the central portion and the outer peripheral portion. The linear motor has one of a stator and a mover fixedly mounted to the support member and another of the stator and the mover fixedly mounted to the counterbalance mass. The linear motor is operative to axially reciprocate the counterbalance mass.
    Type: Grant
    Filed: August 12, 2004
    Date of Patent: August 23, 2005
    Assignee: Stirling Technology Company
    Inventors: Songgang Qiu, John E. Augenblick, Allen A. Peterson, Maurice A. White
  • Patent number: 6933630
    Abstract: A small electric appliance drive mechanism includes a first drive component, a second drive component, and a coil configured to produce a magnetic field extending from the first drive component and acting on the second drive component. The first drive component and the second drive component are movably arranged in the small electric appliance and adapted to oscillate in phase opposition to one another.
    Type: Grant
    Filed: December 3, 2004
    Date of Patent: August 23, 2005
    Assignee: Braun GmbH
    Inventors: Bernhard Kraus, Alexander Klös
  • Patent number: 6933639
    Abstract: A method for driving a thrust body with a bidirectional linear solenoid drive having at least in each case one first actuator and one second actuator includes the steps of providing the at least one first actuator with at least one coil and a yoke and applying force alternately to the thrust body by interacting the first actuator with at least one armature ring. The armature ring is rotated with the second actuator to thereby axially shift the thrust body by the rotation of the armature ring. The thrust body is, then, shifted axially and is subsequently fixed in position with the thrust body being shifted in steps in this way until it has reached its respective final position. Also provided is a configuration for carrying out the method.
    Type: Grant
    Filed: July 19, 2004
    Date of Patent: August 23, 2005
    Assignee: Vecto Gray Controls Limited
    Inventors: Hans-Joachim Krokoszinski, Andreas Kahnert, Wolfgang Waldi, Rolf Disselnkötter
  • Patent number: 6930412
    Abstract: A closed box structure of a horizontal linear motor machine tool, comprising a frame, serving as a machine platform, carrying an X-movable part, a Y-movable part, and a Z-movable part, with said Y-movable part mounted on said X-movable part, said Z-movable part mounted on said Y-movable part, and said Z-movable part having a main axis head; characterized in that said frame, said X-movable part and said Y-movable part are shaped like open squares, said X-movable part, said Y-movable part and said Z-movable part each carry a set of two symmetrically adapted linear motors for being driven, wherein for each of said sets of linear motors magnetic forces are balanced against each other, so that deformations due to magnetic forces are avoided.
    Type: Grant
    Filed: January 16, 2003
    Date of Patent: August 16, 2005
    Inventors: En-Sheng Chang, Ching-Yuan Lin, Chin-Mou Hsu, Hsuan-Jen Kung
  • Patent number: 6930413
    Abstract: The linear synchronous motor consists of a specific primary and secondary part. The secondary portion is a ferromagnetic back plate. An array of permanent magnets are attached to the back plate so that a fixed or variable pole pitch occurs in a precise manner between at least two magnets of alternating polarity which improves existing methods for attaching, guiding, protecting and enhancing the overall flux array produced and emitted by the permanent magnets. A one-piece electrically synchronous linear secondary stator member accompanies a primary member, the synchronous linear permanent magnet motor. The stator electrical frequency is customizeable to allow for a wide variety of braking applications.
    Type: Grant
    Filed: May 23, 2003
    Date of Patent: August 16, 2005
    Assignee: Velocity Magnetics, Inc.
    Inventor: Domenic P. Marzano
  • Patent number: 6930415
    Abstract: An electric linear motor includes a rotor as primary; and a secondary which is spaced from the rotor to define an air gap therebetween for interaction between the rotor and the secondary. The secondary has a carrier with electrically and/or magnetic driving elements, a cover for protection of the carrier against contamination or damage, and a support unit which supports the cover for movement relative to the carrier. Thus, contaminated regions of the cover can be removed from the surface of the secondary and cleaned by a wiper element.
    Type: Grant
    Filed: April 15, 2004
    Date of Patent: August 16, 2005
    Assignee: Siemens Aktiengesellschaft
    Inventor: Thomas Hoppe
  • Patent number: 6927506
    Abstract: The present invention relates generally to reciprocating electromagnetic devices, and more particularly to a construction of a reciprocating electromagnetic device for reducing secondary losses in magnetically-permeable elements, but without compromising manufacturability as required in prior art. The device provides for shaped pole faces to reduce local magnetic flux density and/or interruptions of electrically-conductive paths in the planes of the laminated layers of the stationary element of the device.
    Type: Grant
    Filed: September 24, 2002
    Date of Patent: August 9, 2005
    Assignee: Clever Fellows Innovation Consortium
    Inventor: John A. Corey
  • Patent number: 6922025
    Abstract: The present invention relates systems and methods for compensating for errors associated with a linear motion system. The systems and methods determines one or more errors associated with the linear motion system and adjusts or corrects an input drive signal associated with the linear motion system to compensate for the one or more errors. The one or more errors of the linear motion system can include cogging errors and ripple errors. The one or more errors can be measured using a measurement system or the one or more errors can be associated with selectable coefficients or parameters, such as standard errors, or device type errors stored in a library.
    Type: Grant
    Filed: February 19, 2003
    Date of Patent: July 26, 2005
    Assignee: Anorad Corporation
    Inventor: James F. Smith
  • Patent number: 6919658
    Abstract: An XY coordinate measuring stage includes a drive unit for a coordinate axis. The drive unit has a friction rod and a motor, the motor including a motor shaft in contact with a side of the friction rod. An applied pressure roller contacts an opposite side of the friction rod. At least one applied pressure spring urges the applied pressure roller, the friction rod, and the motor shaft against one another with an applied pressure force so that the motor shaft frictionally engages the friction rod, converting a rotational motion of the motor into a linear motion of the friction rod. A compensation device associated with the motor shaft generates a compensation force onto the motor shaft oppositely to the applied pressure force so as to at least partially compensate for the applied pressure force.
    Type: Grant
    Filed: August 1, 2003
    Date of Patent: July 19, 2005
    Assignee: Leica Microsystems Semiconductor GmbH
    Inventor: Ulrich Kaczynski
  • Patent number: 6914351
    Abstract: A linear electrical machine may function as an alternator or a motor. Three annular magnets may be provided that move relative to a core. The magnets may all have a different magnetic orientation. Two magnets may have a north pole oriented in a direction parallel to an axis along which the magnets move relative to the core. Another magnet may have a north pole oriented in a direction perpendicular to the axis.
    Type: Grant
    Filed: July 2, 2003
    Date of Patent: July 5, 2005
    Assignee: TIAX LLC
    Inventor: Allan Chertok