Patents Examined by B. Dobeck
  • Patent number: 4742284
    Abstract: A controller for close positioning or modulating control of an electric motor is disclosed. The controller compares a signal representative of the demand on the system with a signal representative of the actual position of the motor or a valve associated therewith, and if the difference between the signals exceeds a "deadband" and no action has been taken within a first time interval, and if the last movement of the valve was in the same direction and a second time interval has elapsed, a motor run pulse is generated. If the last movement of the valve was in a direction opposite to that desired, the motor run pulse is extended to overcome "backlash" resulting from the reversal of motor rotation.
    Type: Grant
    Filed: December 9, 1986
    Date of Patent: May 3, 1988
    Assignee: The Babcock & Wilcox Company
    Inventors: Donald J. Dziubakowski, Erik P. Kristoffersen, Ronald J. Teer
  • Patent number: 4684858
    Abstract: An improved system is provided for accurately referencing the revolving motion of electric motors used as positioning devices, and is particularly applicable to the automatic positioning and repositioning of ground station antennas in the reception of satellite TV signals.The system utilizes the action of the positioning motor itself as a reference and involves the extraction and counting of variations in the form of pulses produced in the current within the motor as a result of pulses generated, during motor operation, by the commutation process. A low impedance source senses the motor current pulses and feeds them to an active lowpass filter which suppresses any high frequency noise produced during motor commutation. Peak following circuitry, including separate positive and negative peak detectors, detects and follows the positive and negative peaks of the motor current pulses and produces a pulsating output waveform which is proportional to the number of motor current pulses detected by the peak detectors.
    Type: Grant
    Filed: September 3, 1985
    Date of Patent: August 4, 1987
    Assignee: Capetronic (BSR) Ltd.
    Inventors: John Ma, Steven Weiss
  • Patent number: 4656404
    Abstract: A turbine-driven apparatus and method for generating and linearly controlling periodic bipolar drive signals to drive an electromechanical device, such as a DC motor, in response to an input command signal. The apparatus comprises a rotatable cylindrical commutator driven by a gas turbine, the commutator having two matched half-cylinder conductive sections separated by insulation at the common joints. The turbine also drives an alternator to produce AC power which in turn is rectified to produce DC power. Two pairs of diametrically opposing brushes are held in contact with the rotating commutator. The first pair of brushes connected to the DC power source, is fixed in position. The second pair, connected across the electromechanical load, is adjustable in rotational position relative to the first pair through coupling to a stepper motor.
    Type: Grant
    Filed: February 14, 1985
    Date of Patent: April 7, 1987
    Assignee: Rockwell International Corporation
    Inventor: John F. Klinchurch
  • Patent number: 4651075
    Abstract: Servoed accelerometer with isolated voltage torquing having first and second grounds, a servoed accelerometer having a torque coil, and an amplifier for driving said torque coil. The amplifier has inverting and non-inverting junctions. The second ground is coupled to the non-inverting junction of the amplifier. A torque signal supply is coupled to the first ground. A transformer is provided for coupling the torque signal supply to the non-inverting junction of the amplifier and serves to isolate the torque signal supply from the non-inverting input of the amplifier so that the amplifier and polarity of the torque signal are preserved.
    Type: Grant
    Filed: July 9, 1984
    Date of Patent: March 17, 1987
    Assignee: Systron Donner Corporation
    Inventors: Larry P. Hobbs, Harold D. Morris
  • Patent number: 4634942
    Abstract: Apparatus for controlling d-c shunt motors of electric cars utilizes first chopper circuits connected in series with the armatures of the d-c motors for controlling armature currents upon receipt of a first set of control signals and second chopper circuits connected in series with the field windings of the d-c shunt motors for controlling the field currents responsive to a second set of control signals, reactors having first and second coils, the first coils being connected in series with the armatures and the second coils being connected in series with the field windings, with the first and second coils magnetically coupled together to maintain a relationship that the field currents decrease with a decrease in the armature currents.
    Type: Grant
    Filed: October 30, 1985
    Date of Patent: January 6, 1987
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Masashi Naruto
  • Patent number: 4634887
    Abstract: The propulsion control system of a diesel-electric locomotive includes means responsive to the rotational speed and the gross horsepower of a locomotive engine for controlling the rate at which traction load is added to the engine, when more load is called for, so that the loading rate will increase (between predetermined minimum and maximum limits) as the product of speed and horsepower increases. The loading rate is also increased in response to the ratio of combustion air to diesel fuel increasing above a predetermined no-smoke threshold.
    Type: Grant
    Filed: June 24, 1985
    Date of Patent: January 6, 1987
    Assignee: General Electric Company
    Inventors: Edgar T. Balch, Richard E. Bilski, Ajith K. Kumar
  • Patent number: 4633155
    Abstract: A numerical control system in which data signals are exchanged between a computer processing device MPU and each function block through an address bus ABUS and a data bus DBUS. Parallel electric signals are converted into serial signals by shift registers SHR.sub.1 and SHR.sub.2, and are converted into light signals by transmitters Tx.sub.11 and Tx.sub.12. The light signals are delivered to pulse distributors PDN through optical fiber cables OF.sub.1 and OF.sub.2 and these light signals are converted back to electric signals by receivers Rx.sub.3 and Rx.sub.4 and are further converted into parallel signals by shift registers SHR.sub.3 and SHR.sub.4. The parallel signals are delivered to a pulse distributor PD as position signals in the directions of X, Y and Z axes thereby to driving servomotors.
    Type: Grant
    Filed: October 7, 1985
    Date of Patent: December 30, 1986
    Assignee: Fanuc Ltd.
    Inventors: Hidetsugu Komiya, Mitsuo Kurakake
  • Patent number: 4633153
    Abstract: Motor control apparatus is disclosed for a motor driven vehicle power window mechanism including a flexible drive element, such as a drive tape, adapted to drive the window in a predetermined direction by being placed in tension by the motor. The tension of the flexible drive element is relieved by automatically reversing motor direction for a short time when the window reaches the desired position. The reverse motor rotation is accurately controlled to an amount sufficient to relieve drive tension but insufficient to produce unwanted reverse movement of the window by detecting the pulses of the armature ripple current as the successive commutator bars pass the brushes during reverse motor rotation, integrating these pulses and stopping the reverse motor operation when the integrated value reaches a predetermined reference.
    Type: Grant
    Filed: February 24, 1986
    Date of Patent: December 30, 1986
    Assignee: General Motors Corporation
    Inventors: Dennis P. Thornton, John S. Maceross, Jeff A. Foust, Keith R. Cook
  • Patent number: 4631465
    Abstract: A tool display system of an automatic tool changing apparatus (31) in a machine tool (30) sequentially controlled by a programmable controller (20) on the basis of a control signal from a numerical control unit (1). The tool display system is equipped with a memory (21) for storing the positions of a plurality of pots (31b) provided on a tool magazine (31a) accommodating tools, and a display unit (14) for displaying the tool information stored in the memory (21). The display unit (14) displays a graphic pattern representing the positions of the plurality of pots on the tool magazine (31a) as well as the present positions of tools accommodated in the tool magazine, the latter appearing inside the graphic pattern.
    Type: Grant
    Filed: July 31, 1985
    Date of Patent: December 23, 1986
    Assignee: Fanuc Ltd
    Inventors: Hiroomi Fukuyama, Kiyoshi Hattori, Yoshihiro Nakashima
  • Patent number: 4631462
    Abstract: A system for controlling the speed of an electric motor (12) comprises two counters (1 and 2) which receive counting pulses from an oscillator (5) and control pulses from a tachogenerator (11). The first counter (1) is reset by a tacho-pulse and counts to a predetermined maximum value. The counting direction of the second counter (2) is reversed both when a tacho-pulse appears and when the predetermined fixed value is reached by the first counter (1). A control signal for the motor is obtained by comparing the count of the second counter (2) with a reference value (R) by means of a comparator (14) to derive an on-off signal.
    Type: Grant
    Filed: February 4, 1986
    Date of Patent: December 23, 1986
    Assignee: U.S. Philips Corporation
    Inventor: Willem J. A. Geven
  • Patent number: 4631464
    Abstract: An industrial robot system comprising a robot disposed in an environment having peripheral equipment and operable under program control of a control unit to shift between a normal job mode of operation and an earthquake mode of operation, an earthquake detector which produces an output in accordance with an earth vibration exceeding a predetermined value, and earthquake mode controller disposed between the earthquake detector and the control unit for generating a control output in response to the output of the earthquake detector to interrupt the normal job mode of operation of the robot and shift the robot to the earthquake mode of operation, whereby on the basis of the output of the earthquake detector, the normal job mode of operation of the robot is suspended through the earthquake mode controller and an actuator of the robot is moved in a direction away from peripheral equipment of the robot.
    Type: Grant
    Filed: October 4, 1985
    Date of Patent: December 23, 1986
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Hisao Kato
  • Patent number: 4628238
    Abstract: A positioning device having a plate-shaped carrier (5) which is displaceable in a horizontal plane and which is journalled on a table (1) and on which is exerted a pressure and tensile force, respectively, by means of at least two translation drives (11, 13). The translation drives (11, 13) are coupled to the carrier (5) by means of horizontally operating static thrust and tensile bearings, respectively (33 to 41, 49), which transfer via a viscous medium in a contactless manner pressure and tensile forces respectively, between the carrier (5) and the translation drives (11, 13). The contactless bearings (33 to 41, 49) are pre-stressed with a force which is larger than the maximum occurring tensile force between the drives (11, 13) and the carrier (5). Thus, a substantially frictionless coupling is obtained between the drives (11, 13) and the carrier (5). This coupling acts at the same time as a guide for the carrier (5).
    Type: Grant
    Filed: June 5, 1985
    Date of Patent: December 9, 1986
    Assignee: U.S. Philips Corporation
    Inventors: Hendricus F. G. Smulders, Johannes L. M. Hagen, Marinus J. J. Dona
  • Patent number: 4628236
    Abstract: This disclosure relates to an electric motor control designed for attachment to a support wall or to a pressure switch. The control comprises a support having a base portion and a mounting portion. The base portion has a plurality of electrical terminals attached thereto and has at least one lead opening formed therein for electrical leads. The mounting portion has a lead opening formed therein. A motor control switch including a plurality of electrical terminals is connected to the terminals of said base portion. The mounting portion includes first means for attaching the support to a pressure switch and second means for attaching the mounting portion to a support wall. A cover is removably attached to the base portion, and the control switch is mounted in the cover.
    Type: Grant
    Filed: January 23, 1986
    Date of Patent: December 9, 1986
    Assignee: Franklin Electric Co., Inc.
    Inventor: Edward J. Schaefer
  • Patent number: 4626757
    Abstract: An electronic boat controller which can be plugged in and removed from a boat which is hard wired to a plurality of locations which when plugged into allows the boat controller to become electrically wired to power controllers which supply power on a pulse basis to electric motors from a common power supply. This power supply is an electric battery mounted at the rear of the boat. The controller controls two channels which control ultimately two power supplies to two separate and distinct electric motors which are spacially separated at the rear of the motor permitting turning as well as forward control of the boat.
    Type: Grant
    Filed: March 13, 1984
    Date of Patent: December 2, 1986
    Inventor: Ralph S. Granchelli
  • Patent number: 4625834
    Abstract: In an elevator speed control apparatus wherein an output signal of a speed detector is sampled at a predetermined interval, and an output signal obtained by processing the sampling is applied to an inverter so as to perform a slip frequency control of an induction motor; correction means to receive the speed detector output signal sampled at the predetermined interval, to differentiate it to generate a differential signal and to deliver the differential signal as a correction signal is provided, so that a magnitude by which a rotational speed of the induction motor changes after the output signal of the speed detector has been fed into a microcomputer until the control signal is applied to the inverter is corrected, whereupon the signal for the speed control is delivered to the inverter, thereby to correct the lag of speed detection attributed to the sampling control.
    Type: Grant
    Filed: February 26, 1985
    Date of Patent: December 2, 1986
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Tooru Tanahashi
  • Patent number: 4626758
    Abstract: A digital valve control apparatus for regulating opening of a digital valve by a pulse motor, comprising means for setting desired position and displacement speed of the pulse motor and means for selecting the set position and the set speed in response to instruction signals. While pulses having period corresponding to the set speed are produced by a frequency divider, the present position of the pulse motor is compared with the set position by a comparator. The pulses are fed to a counter which counts up or down to supply the output for driving the pulse motor until the comparator produces the coincident output.
    Type: Grant
    Filed: January 22, 1986
    Date of Patent: December 2, 1986
    Assignee: Tokyo Keiki Company, Ltd.
    Inventors: Kunihiko Takeuchi, Fujio Baba, Kiyoshi Hayashi, Yasuo Shimomura, Yuji Morishige
  • Patent number: 4626751
    Abstract: When the motor's permanent-magnet rotor is in a first range of angular positions a stator-winding phase is energized to have a first magnetic polarity, and to have an opposite second polarity when the rotor is in a second range of angular positions. The rotor angular position is sensed by a magnetic-field-sensitive semiconductor element, especially a Hall generator, responsive to the field from the permanent-magnet rotor. When the rotor is in a range of angular positions between such first and second ranges, all power transistors are rendered non-conductive, by control signals derived from the magnetic-field-sensitive semiconductor element by intermediate circuitry, to render the stator-winding phase currentless during the time interval within which commutation is to occur.
    Type: Grant
    Filed: June 24, 1985
    Date of Patent: December 2, 1986
    Assignee: Papst-Motoren GmbH & Co KG
    Inventor: Benno Doemen
  • Patent number: 4625156
    Abstract: A device for controlling plural loads with phase locked loop control method by means of reference signals of different phases in order to avoid peak in electric power consumption.
    Type: Grant
    Filed: October 24, 1983
    Date of Patent: November 25, 1986
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yutaka Komiya, Masahiro Tomosada, Shinichi Nakamura, Masanori Miyata, Hideki Adachi, Masayuki Hirose
  • Patent number: 4625159
    Abstract: A voltage detector detects the terminal voltage of a smoothing capacitor which is disposed between a converter for generating direct current and an inverter for generating alternating current. The presence and magnitude of regenerative power to the converter is judged by the detecting operation, and when the terminal voltage of the smoothing capacitor has risen, a power control device decreases the slip of an induction motor in succession, whereby the regenerative power is suppressed to zero.
    Type: Grant
    Filed: December 23, 1985
    Date of Patent: November 25, 1986
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Hiroyuki Ikejima
  • Patent number: 4623827
    Abstract: A motor speed control device for variably controlling the rotation speed of a motor over a wide range. The control device performs proportional integration (PI) using an actual motor speed and a set motor speed and applies the resulting amount of operation to a pulse wave modulator, thereby feedback controlling the motor rotation. A constant assigned to a speed compute section is variable to finely adjust the motor speed. A plurality of proporational gains K.sub.p and a plurality of integral gains are selected one at a time each according to the set motor speed. The PI operation, selection of a constant and speed computation are performed inside of a single CPU.
    Type: Grant
    Filed: February 5, 1986
    Date of Patent: November 18, 1986
    Assignee: Ricoh Company, Ltd.
    Inventor: Norifumi Ito