Patents Examined by Patrick R. Salce
  • Patent number: 4920293
    Abstract: A squirrel-cage induction motor having a sectional stator comprising a first stator fixedly held on a frame, and a second stator circumferentially movably supported on the frame beside the first stator. The second stator is displaced relative to the first stator through a gear mechanism by a control motor through an angle meeting operating conditions of the squirrel-cage motor required by the load. Thus, the squirrel-cage induction motor has satisfactory response characteristics, and the second stator can manually be turned in case the component of the mechanism for driving the second stator, for example, the control motor, malfunctions.
    Type: Grant
    Filed: December 9, 1988
    Date of Patent: April 24, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Akio Kanda
  • Patent number: 4920288
    Abstract: A piston engine having a reciprocating piston, which is journalled in a radial direction with respect to the direction of translation by means of at least one dynamic groove bearing located within the piston and is separated from a compression space by an annular sealing gap at an outer surface of the piston. The piston engine is suitable for use in compressors and cryo-coolers, more particularly for cooling of computer processors.
    Type: Grant
    Filed: March 28, 1989
    Date of Patent: April 24, 1990
    Assignee: U.S. Philips Corporation
    Inventors: Ronald den Heijer, Godefridus C. Goverde, Peter G. M. Simons
  • Patent number: 4920289
    Abstract: A bearing holder comprises a plurality of pawls engaged with an internal surface of the bearing containing part, a plurality of slots arranged in circumferences of the pawls, and bearing-contacting part in contact with an outer periphery of the bearing. It is used for holding the bearing supporting an armature shaft of a motor equipped with reduction gear, for example.
    Type: Grant
    Filed: January 3, 1989
    Date of Patent: April 24, 1990
    Assignee: Jidosha Denki Kogyo Kabushiki Kaisha
    Inventor: Yasujiro Saito
  • Patent number: 4920292
    Abstract: A step motor which, in addition to an exciter system for step-by-step movement, is provided with an axial exciter system. As a result of the direct or indirect influence of the magnetic field generated by the secondary exciter system on the rotor which is supported, so as to be able to move in an axial direction with respect to the stator, the rotor can be induced to move in a direction perpendicular to its step-by-step rotary motion, as well. Both exciter systems can be energized independently of one another, so that step-by-step rotary movement can be performed at any axial position of the rotor and the rotor can be made to move in an axial direction during its rotary movement as well as when it is at rest.
    Type: Grant
    Filed: August 28, 1987
    Date of Patent: April 24, 1990
    Assignee: Papst-Motoren GmbH & Co. KG
    Inventors: Klaus Albrecht, Helmut Hans, Johann von der Heide, Fritz Schmider
  • Patent number: 4920472
    Abstract: A crest factor correction circuit for an ac inverter receives inputs including a full-wave rectified output of the ac inverter having a fixed period and a periodic sequence of phase signals that divide each fixed period into predetermined phase intervals. An amplitude and crest factor signal circuit responds to the absolute value signal to provide an amplitude control signal proportional to the negative integral of the difference between the absolute value signal and a set reference voltage. The amplitude and crest factor signal circuit also provides a crest control signal proportional to the negative integral of the difference between the filtered peak value of the absolute value signal and a given reference voltage times a predetermined gain. A series resistor network responds to the amplitude control signal and to the crest control signal and provides a series of tap signals. Each tap signal is proportional to a respective predetermined ratio of the amplitude control signal.
    Type: Grant
    Filed: May 31, 1989
    Date of Patent: April 24, 1990
    Assignee: Deltec Electronics Corporation
    Inventor: Howard Handler
  • Patent number: 4920475
    Abstract: An integrated traction inverter and battery charger apparatus which is capable of operating in either drive or charge modes. The apparatus integrates the components of a prior art three-phase inverter with an AC line-powered prior art DC source charger in a manner which recognizes that an input capacitor and certain components of a three-phase bridge inverter are capable of performing dual functions and thus can be active in both modes. Therefore, in the integration of the prior art devices some of the components are eliminated allowing savings in cost and weight of, and space required by, the components of the integrated inverter/charger apparatus.
    Type: Grant
    Filed: March 7, 1988
    Date of Patent: April 24, 1990
    Assignee: California Institute of Technology
    Inventor: Wally E.. Rippel
  • Patent number: 4918343
    Abstract: A brushless alternator for an engine-generator set has a housing for mounting to the engine. Raised ribs define an internal bore of the housing, the bore having a constant diameter to mount the stator and the exciter field assembly, both of which have the same laminations. The ribs also define cooling air flow paths through the housing. A fan is mounted outside of the housing at the free end of the housing to draw air into the engine end, through the housing and out the free end.
    Type: Grant
    Filed: October 13, 1988
    Date of Patent: April 17, 1990
    Assignee: Kohler CO.
    Inventors: Martin W. Heinrich, James A. Ten Hoven
  • Patent number: 4918344
    Abstract: An electric motor having a frictional planetary speed reducer comprises a hollow cylindrical rotor disposed inside a stator. The speed reducer is at least partly accommodated in the rotor.
    Type: Grant
    Filed: August 2, 1988
    Date of Patent: April 17, 1990
    Assignee: Koyo Seiko Co., Ltd.
    Inventors: Akira Chikamori, Kouichi Ueda
  • Patent number: 4918592
    Abstract: There is disclosed a power regulating system for portable engine generator wherein overcurrent protection is provided by connecting the AC output of an AC generator driven by an engine to a rectifier for conversion to a DC current, supplying the DC current so obtained to an inverter to obtain an AC current of an arbitrary frequency, and providing for stopping of the driving signal to the inverter when an overcurrent state is detected in the inverter.
    Type: Grant
    Filed: October 28, 1987
    Date of Patent: April 17, 1990
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventor: Motohiro Shimizu
  • Patent number: 4918368
    Abstract: A battering charging system is controlled by a microprocessor to charge and discharge batteries while periodically effecting monitoring and control operations in which battery current data are registered to accumulate capacity data in a memory and to thereafter display such data which includes both charge and discharge capacity data. The system has different modes of operation which may be selected by a user, including a charge mode, a discharge mode and an autocycle mode. In the autocycle mode, efficiency rate data is computed and displayed.
    Type: Grant
    Filed: February 29, 1988
    Date of Patent: April 17, 1990
    Assignee: Span, Inc.
    Inventors: William Baker, James C. Stevens, Phong B. Chau
  • Patent number: 4918591
    Abstract: In a high frequency interference suppression filter for a circuit to be connected to a conductor, particularly two-wire sensors having at least one inductor in series with the circuit to be protected from interference and having at least one capacitor parallel to this circuit, an ohmic series resistor is provided which is matched to the characteristic impedance of the conductor.
    Type: Grant
    Filed: September 16, 1988
    Date of Patent: April 17, 1990
    Assignee: Euchner & Co.
    Inventor: Walter Link
  • Patent number: 4918369
    Abstract: A water or fluid driven system is provided for use in a water open or closed loop system. The water driven system includes a flow control valve connected to a water line of the water open or closed loop system for controlling the flow of water into the water driven system, a turbine operatively connected to the flow control valve for receiving under controlled conditions the water, and a generator operatively connected to the turbine. The generator generates electricity in response to the operation of the turbine.
    Type: Grant
    Filed: November 18, 1988
    Date of Patent: April 17, 1990
    Inventor: Donald Solorow
  • Patent number: 4918346
    Abstract: The stator comprises three phase driving coils and an electric commutator for controlling current to the driving coils. The rotor comprises permanent magnets which are alternately magnetized in N polarity and S polarity. Driving torque is generated corresponding to the current flowing through the driving coils and the permanent magnets. On the surface of the permanent magnet facing to the driving coils, two non-magnetizing portions are provided in each permanent magnet having either N or S polarity.
    Type: Grant
    Filed: June 24, 1988
    Date of Patent: April 17, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Fumio Tajima, Nicolas Samman, Kunio Miyashita, Hiroshi Katayama, Motoya Ito, Seiichi Narushima, Kiyoshi Yamamuro
  • Patent number: 4918347
    Abstract: This invention relates to a coil construction for an electric motor comprising a stator having a plurality of slots and teeth, a plurality of windings Uc, Vc and Wc of the respective phases are arranged as a plurality of coil series C.sub.1 and C.sub.2, said coil series C.sub.1 and C.sub.2 are wound independently each other, whereby it is able to procure a high redundancy of said coil series C.sub.1 and C.sub.2.
    Type: Grant
    Filed: September 23, 1988
    Date of Patent: April 17, 1990
    Assignee: Tamagawa Seiki Kabushiki Kaisha
    Inventor: Yosuke Takaba
  • Patent number: 4918590
    Abstract: An electric circuit for supplying electrical power having a controlled frequency to a load includes thyristors, each having an anode terminal, a cathode terminal, and a gate terminal for supplying an electric current from the anode terminal to the cathode terminal; transistors, each having a collector terminal, an emitter terminal and a base terminal for switching ON/OFF an electric current from the collector terminal to the emitter terminal; an arm device connected between the cathode terminal of the thyristor and the collector of the transistor; bridge circuit device, having a plurality of arms between one terminal and another terminal of an electrical power source, so that the positive terminal is coupled to the anode terminal of the thyristors and the negative terminal is coupled to the emitter terminal of the transistor, and controlling circuit, connected to the load, for supplying an electric signal to the base terminal of the transistor to apply an electric voltage intermittently to the load, and suppl
    Type: Grant
    Filed: November 15, 1988
    Date of Patent: April 17, 1990
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Nobuo Ohtuka, Kouichi Matsumoto
  • Patent number: 4916342
    Abstract: In a rotary actuator including a voice coil motor having a coil fitted to the other end portion of a carriage fixed to a rotary shaft and having a load at one of the end portions thereof, the rotary actuator of the present invention is characterized in that the rotation on the coil side and the rotation on the load side with respect to the rotary shaft are balanced. The weight of the coil is adjusted by forming the coil by at least two kinds of coil wires having different specific gravities, and where a plurality of coils are disposed on the outer side of the rotary shaft, the weight of the coil on the load side is made smaller than that of the coil on the opposite side.
    Type: Grant
    Filed: March 2, 1989
    Date of Patent: April 10, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Yoshiyuki Hirano, Yoshihiro Moribe
  • Patent number: 4916341
    Abstract: An electric arbor integrated with an induction motor (2), for frequencies up to and beyond 3000 Hz, is made up of a sleeve (3), made of two coaxial tubular parts (3' and 4") finished at the same time, assuring the identical distance (3"') achieving extreme precision of the arbor (1). The arbor shaft (23), supported by bearings (6, 6' and 6") is inserted into the sleeve (3). To the back end of the sleeve (3) is fastened the motor (2), whose stator core stack (4) is made with thin laminations and into said stator (4) is introduced insulating resin charged with substances improving the thermal conductivity. The rotor (5), mounted cantilevered on the arbor shaft (23), is made of thin condutive laminations, fastened by the damping resin, which, melted on the ends, form the short-circuit rings contained by the rings.
    Type: Grant
    Filed: July 25, 1988
    Date of Patent: April 10, 1990
    Assignee: Tecnodelta S.A.
    Inventor: Elis Mantovani
  • Patent number: 4916340
    Abstract: Movement guiding device includes two parallel stationary guides provided on a surface plate, a plurality of hydrostatic gas bearing members provided in relation to the surface plate and the stationary guides for supporting a Y stage, a plurality of hydrostatic gas bearing members provided in relation to the surface plate and the Y stage for supporting an X stage, two linear motors provided outside the stationary guides for moving the Y stage in a Y direction, and a linear motor coupled integrally to the Y stage for moving the X stage in an X direction. The Y stage moving linear motor has a stator fixed to the surface plate and a moving element fixed to the Y stage. The X stage driving linear motor has a stator fixed to the Y stage and a moving element fixed to the X stage.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: April 10, 1990
    Assignee: Canon Kabushiki Kaisha
    Inventor: Mahito Negishi
  • Patent number: 4916598
    Abstract: An apparatus for detecting a faulty switching device of a current-supply type full-bridge inverter includes current transformers connected to each pair of series connected switching devices of the inverter. A differential amplifier is provided for subtracting one detected current value output by one current transformer from another detected current value output by another current transformer. A rectifier is provided for smoothing and rectifying the output of the differential amplifier, and a comparator is provided for comparing the smoothed and rectified output of the rectifier with a reference value.
    Type: Grant
    Filed: May 4, 1989
    Date of Patent: April 10, 1990
    Assignee: Neturen Company Limited
    Inventors: Shinichi Takase, Masayuki Ishii
  • Patent number: 4916344
    Abstract: A magnet shield having a recessed area for receiving a demagnetized permanent magnet. The magnet and shield are axially inserted between the armature and cylindrical frame of a motor. Locating legs, formed on the end heads between which the cylindrical frame mounts, serve to guide and locate the magnet shield into position. After assembly, the demagnetized magnets are magnetized.
    Type: Grant
    Filed: December 15, 1988
    Date of Patent: April 10, 1990
    Assignee: Prestolite Electric Incorporated
    Inventors: Joe K. Hammer, Alan H. Fitzsimmons, Hans Greutmann