1
Allan B Plunkett: Back EMF sampling circuit for phase locked loop motor control. Synektron Corporation, Chernoff Vilhauer McClung & Stenzel, May 22, 1990: US04928043 (119 worldwide citation)

A sensorless control for DC permanent magnet brushless motor includes a feedback loop connected between the motor stator windings and the inverter which controls the timer at which current is provided to the various windings in sequence. The control of the invention includes a voltage sensing networ ...


2
Allan B Plunkett: Field orientation control of a permanent magnet motor. General Electric Company, Marvin Snyder, James C Davis Jr, March 21, 1989: US04814677 (94 worldwide citation)

A field orientation control system for an interior permanent magnet synchronous motor includes function generating means responsive to a torque command signal for producing direct and quadrature axis direct current signals which are converted to synchronously-varying two-phase signals for coupling t ...


3
John D D Atre, Thomas A Lipo, Allan B Plunkett: Means for stabilizing an a-c electric motor drive system. General Electric Company, Richardson Jr, May 9, 1978: US04088934 (70 worldwide citation)

For use with an adjustable speed a-c electric motor having a stator adapted to be coupled to a source of variable frequency excitation and a rotor in which torque is developed when the motor is excited, the strength of said torque being dependent on interacting current and flux in the motor, a schem ...


4
Gerald B Kliman, Allan B Plunkett: Synchronous disk motor with amorphous metal stator and permanent magnet rotor and flywheel. General Electric Company, Marvin Snyder, James C Davis Jr, March 25, 1986: US04578610 (65 worldwide citation)

An electric machine has a stator body formed of a coil of concentric layers of amorphous metal tape and slots are formed in one end of the coil for receiving a stator winding. A rotor structure having permanent magnet poles embedded therein is placed adjacent the end surface of the stator and is cou ...


5
Timothy J E Miller, Allan B Plunkett, Robert L Steigerwald: Regenerative unipolar converter for switched reluctance motors using one main switching device per phase. General Electric Company, Marvin Snyder, James C Davis Jr, August 4, 1987: US04684867 (52 worldwide citation)

In a converter for a switched reluctance motor, a dump capacitor receives freewheeling current from each phase and resupplies the charge to the dc supply. In this manner, residual magnetic energy is recovered and phase current quickly reduced while the converter requires only one main switching devi ...


6
Allan B Plunkett: Apparatus for controlling a PWM inverter-permanent magnet synchronous motor drive. General Electric Company, William H Steinberg, James C Davis Jr, Marvin Snyder, November 30, 1982: US04361791 (34 worldwide citation)

Apparatus for controlling a permanent magnet AC synchronous motor supplied by a forced commutated inverter that does not use a mechanical shaft position sensor. A control loop regulates an inverter frequency and maintains inverter synchronism with the motor using electrical angle feedback signals de ...


7
Allan B Plunkett: Pulse width modulated inverter machine drive. General Electric Company, William H Steinberg, James C Davis Jr, Marvin Snyder, March 22, 1983: US04377779 (27 worldwide citation)

Improved operation of a pulse width modulated inverter machine drive system is obtained by a control apparatus which regulates inverter switching device conduction by modifying switching signal waveforms transmitted to the inverter to eliminate switching pulses narrower than the minimum inverter swi ...


8
John D D Atre, Allan B Plunkett: Stabilizing scheme for an a-c electric motor drive system. General Electric Company, Albert S Richardson Jr, May 9, 1978: US04088935 (25 worldwide citation)

For use with an adjustable speed a-c electric motor comprising a stator having effective direct and quadrature axes and a rotor spaced from the stator by a gap, said stator including windings adapted to be connected to a source of excitation of variable frequency and amplitude, a scheme is provided ...


9
Allan B Plunkett: Transistorized current controlled pulse width modulated inverter machine drive system. General Electric Company, William H Steinberg, James C Davis Jr, Marvin Snyder, March 16, 1982: US04320331 (24 worldwide citation)

An alternating current machine drive system, comprised of an alternating current machine and an inverter configured of a plurality of pairs of transistors with the transistors of each pair coupled in series-aiding fashion and each of the pairs of serially coupled transistors connected across a direc ...


10
Allan B Plunkett: Method and apparatus for generating an air gap flux signal for an AC machine from AC line voltage and current values. General Electric Company, Marvin Snyder, James C Davis, January 13, 1981: US04245181 (21 worldwide citation)

A substantially smooth, continuous and sinusoidal air gap flux signal for an AC machine is provided from machine terminal voltages and line currents. A voltage representative of the machine stator voltage is combined with a voltage representative of the resistive voltage drop component across the st ...