Patents by Inventor Donald E. Fulton

Donald E. Fulton has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20170259800
    Abstract: An air disc brake system for a heavy-duty vehicle comprising an axle. A spindle is attached to an end portion of the axle. At least a portion of an air disc brake assembly is supported by the spindle. A suspension beam has an axle support portion connectable with the axle. An end portion of the suspension beam is spaced from the axle support portion for attachment with the heavy-duty vehicle. The suspension beam may pivot about the end portion of the suspension beam. An actuator actuates the air disc brake assembly. The actuator has a movable member to actuate the air disc brake assembly. Structure is associated with the suspension beam for supporting at least a portion of the actuator. A surface defines an opening in the suspension beam through which the movable member may extend or that may receive and support a portion of the actuator.
    Type: Application
    Filed: March 8, 2017
    Publication date: September 14, 2017
    Inventors: R. Scott Fulton, Jeffrey R. Wittlinger, John E. Ramsey, Donald R. Hester, Benedetto Naples, Matthew Karich
  • Patent number: 6998800
    Abstract: A system is provided for sensing a motor current from a three phase inverter. A first resistor is coupled between a first transistor of the inverter and a supply voltage, and a second resistor is coupled between a second transistor of the inverter and ground. Circuitry coupled to the first and second resistors generates an upper and lower current. When the first transistor is active, the upper current is proportional to the sum of a reference voltage and a voltage across the first resistor, and the lower current is proportional to the reference voltage. When the second transistor is active, the upper current is proportional to the reference voltage, and the lower current is proportional to the sum of the reference voltage and a voltage across the second resistor. Based on the difference of the lower and upper currents, the circuitry provides an output current proportional to the motor current.
    Type: Grant
    Filed: September 5, 2003
    Date of Patent: February 14, 2006
    Assignee: Kollmorgen Corporation
    Inventor: Donald E. Fulton
  • Patent number: 4868479
    Abstract: A back EMF controlled, synchronous, permanent magnet motor capable of extremely high rotation speeds at high efficiency. The motor includes a permanent magnet flux source and excitation coils for producing a rotating magnetic field mounted on an iron free form to substantially eliminate core loss and resulting rotor drag. Back EMF is determined directly from the excitation and controls the excitation to produce a torque angle of substantially 90.degree. between the magnet and coil fluxes. Coil excitation is used at maximum efficiency and hunting is avoided. The permanent magnet provides a high flux density that also allows a low current in the motor coils and thus reduces coil copper losses to further improve efficiency.
    Type: Grant
    Filed: August 4, 1987
    Date of Patent: September 19, 1989
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventors: Ahn Byong-Ho, Donald E. Fulton, Philip J. Gilinson, Jr., David C. Whipple, William P. Curtiss
  • Patent number: 4862049
    Abstract: A system for generating substantially constant area pulses suitable for application to an inertial instrument torquer. The torquer current pulses are directly utilized to provide an averaging feedback loop wherein the variations in pulse width due to errors in switching pulse times are offset by amplitude control for the pulses. With this system, variations in width of the torquer current pulses are offset in a high speed, closed loop manner with compensation occurring within the pulse interval.
    Type: Grant
    Filed: February 21, 1978
    Date of Patent: August 29, 1989
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventor: Donald E. Fulton
  • Patent number: 4670698
    Abstract: A method of measuring induction motor parameters so that the speed and torque control of an induction motor controller may be optimized. While the motor is stopped, a test signal made up of a current pulse of a known amplitude is applied to one or more windings of the motor stator for a selected period of time, after which the current pulse is turned off. After a short delay, the instanteous voltage across the stator windings is measured, and also an integration of the stator voltage is started which continues long enough so that the stator voltage decays to substantially zero. The measured voltage and integrated voltage are respectively proportional to the rotor resistance and the motor magnetizing inductance.
    Type: Grant
    Filed: December 2, 1983
    Date of Patent: June 2, 1987
    Assignee: IMEC Corporation
    Inventors: Donald E. Fulton, William P. Curtiss, Jonathan R. Leehey
  • Patent number: 4620272
    Abstract: An AC motor drive includes a power converter which supplies current to a DC bus from three-phase power lines. An inverter drives the motor from power delivered to the DC bus and it regenerates power to the DC bus when the motor is decelerated. The power converter in turn regenerates the power to the power lines by controlling line current such that it is substantially in-phase with the applied line voltages. Current overload protection is provided for the transistor switches employed in the power converter bridge circuit.
    Type: Grant
    Filed: August 31, 1984
    Date of Patent: October 28, 1986
    Assignee: IMEC Corporation
    Inventors: Donald E. Fulton, Stanley P. Sassower
  • Patent number: 4506321
    Abstract: A microprocessor-based motor control system operates the rapid advance motor on a slide transfer machine to carry out rapid traverse motions in minimal time. A velocity profile is stored during the acceleration portion of the move and this data is employed to determine when deceleration should begin and to control velocity during the deceleration portion of the move. A position feedback circuit having programmable resolution is employed to develop the velocity profile.
    Type: Grant
    Filed: September 8, 1982
    Date of Patent: March 19, 1985
    Assignee: IMEC Corporation
    Inventors: Robert H. Comstock, William P. Curtiss, Donald E. Fulton
  • Patent number: 4484126
    Abstract: The present invention generates a motor slip frequency value and two current magnitude values representing quadrature components of the motor stator current to be generated. Closed-loop control of the motor operation is provided by feeding back a signal representative of the motor shaft speed or position calculate the torque required from the motor. The feedback signal is separated into high and low frequency components. Additional circuitry changes the value in response to detected variations in the high frequency components of the feedback signal. The addition of this circuitry causes the motor control circuit to no longer represent the inverse of the motor transfer function network.
    Type: Grant
    Filed: September 7, 1982
    Date of Patent: November 20, 1984
    Assignee: IMEC Corporation
    Inventors: Donald E. Fulton, Robert H. Comstock
  • Patent number: 4461987
    Abstract: A current sensing circuit includes an impedance network having a capacitor which produces a voltage proportional to the steady-state component of current and an inductance which produces a voltage proportional to the transient component. The capacitor voltage modulates a carrier signal which conveys the steady-state component through an isolation transformer to a demodulator. The transient component is conveyed through a second isolation transformer and is summed with the demodulated steady-state component.
    Type: Grant
    Filed: September 8, 1982
    Date of Patent: July 24, 1984
    Assignee: Allen-Bradley Company
    Inventors: Donald E. Fulton, William P. Curtiss, William T. Fejes, Jr.
  • Patent number: 4455513
    Abstract: A transducerless brushless permanent magnet motor in which a signal induced by the rotor in an unexcited winding is used to sense the rotor position. The sensed voltage, induced in the winding by the rotor, is integrated to provide a representation of the magnetic flux coupling the rotor and winding. Before start-up, both the rotor position and the integrator are initialized to align the circuit representation of the flux with the actual flux.In an additional embodiment of the invention, a self-initialization circuit is provided to automatically preset the rotor and flux integrator to pre-determined and corresponding values.
    Type: Grant
    Filed: July 26, 1982
    Date of Patent: June 19, 1984
    Assignee: Imec Corporation
    Inventors: Donald E. Fulton, William P. Curtiss, William T. Fejes, Jr.
  • Patent number: 4417194
    Abstract: An electric power generator system including a switched capacitor controlled induction generator adapted to provide power at a regulated voltage and frequency. The system is adapted for autonomous operation for delivery of power with unity power factor to an external power grid.
    Type: Grant
    Filed: September 18, 1980
    Date of Patent: November 22, 1983
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventors: William P. Curtiss, Donald E. Fulton
  • Patent number: 4348627
    Abstract: A control system for an induction machine. The system includes a multiphase variable frequency oscillator adapted to provide at least one pair of signals having frequencies proportional to the sum of a desired slip frequency and the frequency of rotation of the induction motor shaft, where the signals are in phase quadrature. A weighting network amplitude-scales one of each pair of signals by a factor related to the desired slip frequency. A summing network then generates an excitation signal for each stator winding by summing the amplitude-scaled signal and its associated quadrature signal corresponding to that stator winding.
    Type: Grant
    Filed: March 24, 1980
    Date of Patent: September 7, 1982
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventor: Donald E. Fulton
  • Patent number: 4275343
    Abstract: A back EMF controlled, synchronous, permanent magnet motor capable of extremely high rotation speeds at high efficiency. The motor includes a permanent magnet flux source and excitation coils for producing a rotating magnetic field mounted on an iron free form to substantially eliminate core loss and resulting rotor drag. Back EMF is determined directly from the excitation and controls the excitation to produce a torque angle of substantially 90.degree. between the magnet and coil fluxes. Coil excitation is used at maximum efficiency and hunting is avoided. The permanent magnet provides a high flux density that also allows a low current in the motor coils and thus reduces coil copper losses to further improve efficiency.
    Type: Grant
    Filed: December 28, 1978
    Date of Patent: June 23, 1981
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventors: Donald E. Fulton, William P. Curtiss
  • Patent number: 4266176
    Abstract: A slip frequency controller for an induction motor. The controller includes an oscillator for providing a high frequency (f.sub.o) pulse stream which is counted down by first counter having modulo M and a second counter with modulo M+K, where M is a positive integer, K is a positive or negative integer, and K is small compared with M. An incremental shaft encoder provides a relatively low frequency pulse stream having a pulse repetition frequency equal to M times the shaft rotation frequency for the motor times the number of pole pairs in the motor. Each pulse produced by the encoder represents an angular increment in position of the motor shaft. The output frequency of the first counter is slightly modified from the nominal f.sub.o /M by a pulse adder/subtracter network which either adds or subtracts a pulse from the input pulse stream applied to the first counter each time a pulse is received from the shaft encoder. The output frequency of the first counter is then f.sub.
    Type: Grant
    Filed: August 29, 1979
    Date of Patent: May 5, 1981
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventor: Donald E. Fulton