1
Allan Barr Plunkett: Adjustable speed A-C motor drive with smooth transition between operational modes and with reduced harmonic distortion. General Electric Company, Richardson Jr, September 6, 1977: US04047083 (84 worldwide citation)

Alternating voltage for energizing an adjustable speed a-c motor is derived from unipolarity input voltage by means of electric power inverting apparatus comprising at least one pair of alternately conducting controllable electric valves. The conducting states of these valves are periodically switch ...


2
Allan Barr Plunkett: Torque regulating induction motor system. General Electric Company, Richardson Jr, C W Helzer, May 10, 1977: US04023083 (67 worldwide citation)

A torque regulating alternating current induction motor control system comprising a motor flux sensing coil arrangement mounted on the induction motor stator for sensing the actual flux produced across the rotor-stator air gap of the motor and deriving a motor flux voltage signal proportional to the ...


3
Allan Barr Plunkett: Dynamic brake blending for an inverter propulsion system. General Electric Company, J H Beusse, June 6, 1978: US04093900 (65 worldwide citation)

The stator terminals of an adjustable speed a-c induction motor are connected to a source of d-c electric power by means of an inverter, and a system is provided for blending both dynamic and regenerative electrical braking of the motor whenever it decelerates. The brake blending system comprises a ...


4
Allan Barr Plunkett: Adaptive acceleration responsive system. General Electric Company, J H Beusse, February 21, 1978: US04075538 (55 worldwide citation)

A method and apparatus for rapidly detecting acceleration variations in a moving object by monitoring the instantaneous velocity of the object. A signal representative of instantaneous velocity is operated on to derive signals representative of average acceleration, instantaneous acceleration and pr ...


5
Karl Frank Konecny, Allan Barr Plunkett, Kelly Ray Packard, Jacqueline Rae Akerson: Downhole pumping system with variable speed pulse-width modulated inverter coupled to electrical motor via non-gap transformer. Reda Pump, Arnold White & Durkee, June 1, 1999: US05909098 (26 worldwide citation)

An improved downhole pumping system that employs a variable speed PWM inverter and a non-gap transformer to drive an induction motor over a range of different speeds, without saturating the transformer. The variable speed PWM inverter provides a rectangular PWM signal that may be varied according to ...


6
Allan Barr Plunkett, John Douglas D Atre: Method and apparatus for controlling variable speed, controlled current induction motor drive systems. General Electric Company, Richardson Jr, August 23, 1977: US04044285 (25 worldwide citation)

A new induction motor control method and system utilizes one more electric power inverters each supplying a separate induction motor with alternating current excitation power. The respective inverters preferably comprise auto-sequential commutated controlled current inverters. Direct current is supp ...


7
Karl Frank Konecny, Allan Barr Plunkett, Kelly Ray Packard, Jacqueline Rae Akerson: Downhole pumping system with variable speed pulse width modulated inverter coupled to electrical motor via non-gap transformer. Reda Pump, Arnold White & Durkee, December 1, 1998: US05844397 (23 worldwide citation)

An improved downhole pumping system that employs a variable speed PWM inverter and a non-gap transformer to drive an induction motor over a range of different speeds, without saturating the transformer. The variable speed PWM inverter provides a rectangular PWM signal that may be varied according to ...


8
Joseph Phillip Franz, Allan Barr Plunkett: Apparatus for regulating magnetic flux in an AC motor. General Electric Company, Walter C Bernkopf, Albert S Richardson Jr, March 8, 1977: US04011489 (22 worldwide citation)

A flux sensing coil is installed in each phase of the motor stator, and the resulting induced voltages represent the rate of change of air gap flux in that phase. The output voltage signals are integrated, rectified and summed to obtain an average motor flux signal which is in turn applied to vary t ...


9
Allan Barr Plunkett, John Douglas D Atre: Alternating current motor control method and system. General Electric Company, Richardson Jr, August 23, 1977: US04044284 (8 worldwide citation)

A new and improved motor control method and system wherein the frequency of the rotating electro-magnetic flux produced in an alternating current machine, is sensed and compared to a desired value of machine flux frequency to derive an output error control signal. The output error control signal is ...


10
Robert James Griffith, Allan Barr Plunkett: Torque analog of a series wound DC traction motor. General Electric Company, J H Beusse, May 16, 1978: US04090119 (8 worldwide citation)

Apparatus for electronically simulating the response of a direct current traction motor to predetermined operating states whereby there is provided a resultant signal representative of the torque that would be produced by an actual motor operating in the prescribed states. The apparatus calculates E ...