Patents Examined by Patrick R. Salce
  • Patent number: 4924130
    Abstract: A reluctance synchronous electric machine whose rotor is of the kind with a magnetically axial segmentation and includes magnetically axial layers of a ferromagnetic material alternated with intercalary layers of a non-ferromagnetic material. Some permanent magnets are inserted within the intercalary layers and they are oriented in such a way that they produce a magnetic flux oriented along the quadrature axis of the rotor in the sense opposite the magnetic flux produced along the same quadrature axis by the feed current flowing through the stator windings. Preferably the permanent magnets are proportioned in order to compensate at least by approximation the magnetic flux along the quadrature axis when the current flowing through the stator windings is the nominal current of the machine.
    Type: Grant
    Filed: March 30, 1989
    Date of Patent: May 8, 1990
    Inventor: Antonino Fratta
  • Patent number: 4922152
    Abstract: A rotor lamination for a permanent magnet synchronous machine. The rotor lamination can be used for a two, four or eight pole synchronous machine. The orientation of the permanent magnets determines the number of poles of the machine. The lamination can also include openings adapted to contain conductors used to bring a synchronous motor up to synchronous speed as an induction motor.
    Type: Grant
    Filed: June 7, 1989
    Date of Patent: May 1, 1990
    Assignee: Siemens Energy & Automation, Inc.
    Inventors: R. Linn Gleghorn, Paul D. Wagner
  • Patent number: 4922147
    Abstract: An apparatus and method are provided for thermally balancing the rotor of a dynamo-electric machine by adjusting the flow of coolant through the rotor. According to one embodiment of the invention, the cooling flow is adjusted by inserted baffles into the axial coolant flow passages in the body portion of the rotor. According to another embodiment of the invention the cooling flow is adjusted by inserting adjustable orifices into the radial cooling passages in the body portion of the rotor.
    Type: Grant
    Filed: November 25, 1988
    Date of Patent: May 1, 1990
    Assignee: Westinghouse Electric Corp.
    Inventors: Albert C. Sismour, Jr., Robert T. Hagaman, Sui-Chun Ying
  • Patent number: 4922142
    Abstract: The method and apparatus for controlling the travel of a carriage of a linear motor along the motor primary by providing a wedge shaped member adjacent the entrance or exit of the electromagnetic field of the primary.
    Type: Grant
    Filed: June 22, 1988
    Date of Patent: May 1, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Paul W. Givler, Jr., William J. Hommes, Cobern V. Peterson, Madison A. Culver
  • Patent number: 4922159
    Abstract: A high precision linear actuator for compensating short stroke, high frequency vibrations in a space deployed structure comprises a set of cylindrical magnetic pole pieces affixed to respective ones of a pair of graphite flexures, that are mounted to a thermally conductive cylindrical housing, which is to be affixed to the space deployed structure. Reaction against the "proof mass" pole pieces is achieved by a magnetic field produced by set of stationary magnetic coils that surround the pole pieces and are energized by a vibration compensation reaction current supplied from a sense/control processor. Coaxial with and mounted integrally with the cylindrical pole pieces of the proof mass is an internal accelerater, which generates an output signal representative of the force to which the proof mass is subjected.
    Type: Grant
    Filed: May 9, 1988
    Date of Patent: May 1, 1990
    Assignee: Harris Corporation
    Inventors: Douglas J. Phillips, Keith E. Kessler, John W. Shipley, Dave Hyland
  • Patent number: 4922164
    Abstract: An eccentric motion motor includes a hollow cylindrical stator in which is positioned a cylindrical armature in rolling engagement with the stator. Elongate conductive strips are disposed in the inside wall of the hollow of the stator to extend substantially the length thereof, with the strips being circumferentially spaced about the stator hollow. The conductive strips are coupled to a commutator voltage source which applies a voltage to successive ones of the conductive strips to produce an electrostatic force which attracts the armature and causes it to roll in the hollow of the stator. The armature may be made either of a conductive material or a dielectric material.
    Type: Grant
    Filed: October 3, 1988
    Date of Patent: May 1, 1990
    Assignee: Sarcos Group
    Inventors: Stephen C. Jacobsen, John E. Wood, Richard H. Price
  • Patent number: 4922145
    Abstract: A stepper motor is disclosed which is comprised of planar elements. The motor comprises a disc-shaped rotor which includes a multipolar permanent magnet and generally planar stator coils mounted on opposite sides of the rotor. In order to provide a stepper motor which is efficient and is also relatively thin in the axial direction, generally planar pole plates having radially extending teeth are used to define the magnetic poles of the stator.
    Type: Grant
    Filed: November 17, 1988
    Date of Patent: May 1, 1990
    Assignee: Eastman Kodak Company
    Inventor: Boris A. Shtipelman
  • Patent number: 4922151
    Abstract: A two point mounting assembly for mounting a dynamoelectric machine or motor in a domestic appliance, for example, a washing machine is disclosed as including a motor having front and rear endshields. The front endshield of the motor, through which a motor shaft extends, has mounting ears integrally formed with it. A mounting plate is provided for the washing machine. The plate has a transmission for transmitting power from the motor to a tub and agitator of the washer. The mounting plate includes a yoke sized to support the motor along an endshield ear and yoke arm abutment. The yoke arms have elongated slots formed in them. Bolts having at least partially squared shafts, for attaching the motor to the plate, aid in limiting rotation of the motor after installation. The transmission has a corresponding shaft having a drive pulley mounted to it. The motor shaft has a drive pulley on it.
    Type: Grant
    Filed: August 2, 1988
    Date of Patent: May 1, 1990
    Assignee: Emerson Electric Co.
    Inventor: John G. Lewis
  • Patent number: 4922160
    Abstract: A load driving circuit for supplying a load current proportional to an input signal to drive an impedance load. The load driving circuit includes a current detecting circuit for generating a load current signal representing a magnitude of a load current flowing through the impedance load, a voltage supply for producing a voltage signal corresponding to a difference between the load current signal and the input signal and for supplying the voltage signal to a first end of the impedance load, and an inverting voltage supply for inverting the voltage signal and for supplying an inverted the voltage signal to an opposite end of the impedance.
    Type: Grant
    Filed: February 17, 1989
    Date of Patent: May 1, 1990
    Assignee: Pioneer Electronic Corporation
    Inventor: Yoichi Ogawa
  • Patent number: 4922405
    Abstract: The present invention provides a high voltage transformer consisting essentially of a magnetic iron core, yokes and primary and secondary coils, with high voltage rectifier and fine control element for the energy supply of single and multistage electron accelerators, wherein the primary coil is such a distance from the secondary coil that a large stray field results, the ratios of yoke to limb lengths being from 1:1 to 2:1.
    Type: Grant
    Filed: August 22, 1983
    Date of Patent: May 1, 1990
    Assignee: Polymer-Physik GmbH & Co. KG
    Inventors: Foll, Eberhard, Gustav Guth, Joachim Guth, Peter Holl, Alexander van Raaij
  • Patent number: 4922149
    Abstract: A rear housing structure of an electric motor device is disclosed, which comprises a cup-shaped rear bracket made of resin coupled to the cylindrical yoke. According to one aspect of the invention, the rear bracket is secured to the yoke by a through bolt which extends, at the head thereof, through a boss formed at the outside of the side of the bracket, and is fastened to the front frame coupled to the front (or output) side of the yoke. An abutment member, which may by integral with the yoke or the base plate for the brush of the motor, extends radially outwardly from the rear end of the yoke, so that the front end of the boss abuts against this abutment member. Thus, the fastening force of the through bolt is born by the abutment member and the development of the bending and tensile stresses in the bracket can be prevented. According to another aspect, the through bolt extends through the bottom of the cup-shaped rear bracket and runs within the yoke to be fastened to the front frame.
    Type: Grant
    Filed: November 28, 1988
    Date of Patent: May 1, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shuzoo Isozumi, Keiichi Konishi
  • Patent number: 4922397
    Abstract: A DC to DC converter is described having a bridge circuit coupled to the secondary windings of a transformer, the transformer supplying power to a capacitor and a constant current load source. The circuit parameters are chosen to provide a circuit that has quasi-resonant characteristics close to the frequency of the signal providing power to the transformer, but at a higher value. Other constraints on the circuit parameters are discussed. The resulting circuit provides an efficient transfer of energy from the source power supply to the load.
    Type: Grant
    Filed: February 6, 1989
    Date of Patent: May 1, 1990
    Assignee: Digital Equipment Corporation
    Inventor: Albert M. Heyman
  • Patent number: 4922150
    Abstract: The vertical-axis electrical machine of umbrella design has a disc-shaped rotor (4), the combined thrust and guide bearing (12) which is mounted at the disc underside. The bearing rests on a bearing support structure (17), which has the shape of a hollow truncated cone and is supported directly on the foundation (1). This arrangement is distinguished by low design height. Elongations of the bearing support structure (17) caused by temperature are converted without loss of stiffness and centering into axial displacement of the end of the hollow truncated cone (17) on the bearing side.
    Type: Grant
    Filed: April 11, 1989
    Date of Patent: May 1, 1990
    Assignee: Asea Brown Boveri Ltd.
    Inventor: Mihailo Starcevic
  • Patent number: 4922165
    Abstract: A core for a dynamoelectric machine has a pair of generally opposite end faces, and wall means is provided in the core for defining at least one winding receiving slot intersecting the opposite end faces, respectively. At least a pair of layers of generally thin dielectric material are associated in overlaying relation and disposed in the slot. A set of apertures are arranged in a preselected pattern in the layers and disposed in non-aligning relation, and a set of non-apertured sections in the layers are arranged in the layer between the apertures, respectively. At least some of the apertures in each layer are communicated with at least some of the non-aperture sections in an adjacent layer, and the at least some apertures in one of the layers is also communicated with the wall means of the at least one slot.A method of assembling a core, a method of treating a core, and a method of assembling a slot liner are also disclosed.
    Type: Grant
    Filed: January 13, 1989
    Date of Patent: May 1, 1990
    Assignee: General Electric Company
    Inventors: Delmar E. Crawford, Harold T. Fields
  • Patent number: 4922396
    Abstract: The pulse generator of a DC-DC converter is operated in single-ended mode and the secondary winding (W2, 1) which is connected to the bridge rectifier (BR) is also used for the demagnetization of the transformer (XFMR). A terminal (A, C) of the secondary winding (W2, 2) is connected through a capacitance C1 to a connection point (G) of low potential.
    Type: Grant
    Filed: July 25, 1988
    Date of Patent: May 1, 1990
    Inventor: Gert G. Niggemeyer
  • Patent number: 4922143
    Abstract: A linear unit comprises carriage which is arranged longitudinally displaceably in a holder and is driven by a linear motor, the rotor of which is designed as a flexible strip with a tooth structure consisting of magnetic metal. The strip is fixed self-supportingly on the carriage at its two ends and is guided on both sides on the surfaces of the stators of the linear motor bounding the pole gap.
    Type: Grant
    Filed: January 13, 1988
    Date of Patent: May 1, 1990
    Assignee: Robert Bosch GmbH
    Inventors: Gerhard Gosdowski, Andreas Kettner
  • Patent number: 4922404
    Abstract: A synchronous rectifier circuit employs therein a pair of synchronously-operated switches, each switch being coupled between a separate respective input terminal and an output terminal of the circuit. One of the synchronously-operated switches is gated ON when a voltage applied across the synchronous rectifier circuit input terminals is of one polarity, and is gated OFF when current therein becomes substantially zero. The second switch is gated ON when a voltage applied across the input terminals is of the opposite polarity, and is gated OFF when current therein becomes substantially zero.
    Type: Grant
    Filed: March 15, 1989
    Date of Patent: May 1, 1990
    Assignee: General Electric Company
    Inventors: Gerald W. Ludwig, Gerhard A. Franz
  • Patent number: 4922400
    Abstract: Prior neutral forming circuits for use in developing a neutral voltage for loads coupled to an inverter have been unduly large and heavy or have required that the inverter be operated by a half bridge control which causes less easily filtered harmonics to be produced in the inverter output. In order to overcome these problems, a neutral forming circuit includes first and second impedances coupled together at a junction to form a series combination which is coupled across a pair of DC link conductors coupled to an inverter input and a third impedance coupled between the junction and a neutral terminal at which the neutral voltage is formed, the first through third impedances forming a resonant circuit having a resonant frequency substantially equal to the output frequency of the inverter.
    Type: Grant
    Filed: August 3, 1989
    Date of Patent: May 1, 1990
    Assignee: Sundstrand Corporation
    Inventor: Alexander Cook
  • Patent number: 4919030
    Abstract: A visual indicator of temporal accuracy of compared percussive transient signals having a receiver for a reference input signal, a receiver for a performance or test input signal. An electronic circuit determines whether the first signal received is received by the reference input signal receiver or the performance input signal receiver. Further, the circuit determines the time difference between when the reference signal and the performance signals are received. A visual display indicates to the user whether the test signal is ahead or behind the reference signal and by how much it is ahead or behind. The indicator further displays an indication of when the two signals are received at substantially the same time.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: April 24, 1990
    Inventor: Marius R. Perron, III
  • Patent number: 4920470
    Abstract: An inverter circuit includes a transformer having a primary winding with a first end adapted to be connected to a d.c. source, a switch connecting the other end of the primary winding to a reference potential, a secondary winding coupled to the primary winding, a rectifier for rectifying the output of the secondary winding, and a bridge switch circuit connected to invert the rectified secondary winding voltage to produce an a.c. output voltage. The inverter circuit further includes a first control circuit for producing a first pulse train of pulses having a first given frequency and a pulse width responsive to the rectified output voltage of the secondary winding, and a circuit for applying the pulse train to the switch for controlling the switch to open and close at the given frequency.
    Type: Grant
    Filed: May 17, 1989
    Date of Patent: April 24, 1990
    Assignee: Zirco, Inc.
    Inventor: Philip E. Clements