Assignee: Unico, Inc.

Location: Franksville, WI
No. of patents: 24

Number	Title	Issue Date
8180593	Determination and control of wellbore fluid level, output flow, and desired pump operating speed, using a control system for a centrifugal pump disposed within the wellbore A method and apparatus for determining a fluid level and/or output flow during operation of a centrifugal pump, are provided, which may be used for production of gas and/or oil from a well, and include a vector feedback model to derive values of torque and speed fro...	05/15/2012
8152492	Linear rod pump apparatus and method An apparatus and method for pumping fluids, such as water and/or hydrocarbons, from a subterranean formation or reservoir, include a linear rod pump having a mechanical rack and pinion drive arrangement, adapted for attachment to a pumping mechanism, such as the pol...	04/10/2012
8080950	Induction motor torque control in a pumping system A system and method are provided for controlling the speed of a motor driving a load that is electrically connected to a generator driven by an engine, through use of a first control feedback loop configured to control the rotor flux of the motor by controlling the ...	12/20/2011
7921689	Pneumatic biasing of a linear actuator and implementations thereof An improved method and apparatus are provided for constructing and operating a linear actuator, and equipment incorporating a linear actuator, by operatively connecting a pressure biasing pneumatic arrangement between the driving member and the driven member of a me...	04/12/2011
7869978	Determination and control of wellbore fluid level, output flow, and desired pump operating speed, using a control system for a centrifugal pump disposed within the wellbore A method and apparatus for determining a fluid level and/or output flow during operation of a centrifugal pump, are provided, which may be used for production of gas and/or oil from a well, and include a vector feedback model to derive values of torque and speed fro...	01/11/2011
7786691	Bus disturbance regulator Presented is a harmonic regulator that regulates a plurality of individual harmonics in a system having periodic torque disturbances to commanded values, including zero. For each harmonic being regulated, a feedback signal having at least one harmonic component due ...	08/31/2010
7748308	Pneumatic biasing of a linear actuator and implementations thereof An improved method and apparatus are provided for constructing and operating a linear actuator, and equipment incorporating a linear actuator, by operatively connecting a pressure biasing pneumatic arrangement between the driving member and the driven member of a me...	07/06/2010
7668694	Determination and control of wellbore fluid level, output flow, and desired pump operating speed, using a control system for a centrifugal pump disposed within the wellbore A method and apparatus for determining a fluid level and/or output flow during operation of a centrifugal pump, are provided, which may be used for production of gas and/or oil from a well, and include a vector feedback model to derive values of torque and speed fro...	02/23/2010
7645124	Estimation and control of a resonant plant prone to stick-slip behavior A method and apparatus are provided for estimating and/or precluding stick-slip, or other oscillatory or resonant behavior, through use of a virtual transducer, which precludes the need for having sensors located adjacent to a driven element of the system, or adjace...	01/12/2010
7558699	Control system for centrifugal pumps A control system for the operation of a centrifugal pump which may be used for production of gas and/or oil from a well. The control system includes vector feedback model to derive values of torque and speed from signals indicative of instantaneous current and volta...	07/07/2009
7545113	Harmonic disturbance regulator Presented is a harmonic regulator that regulates a plurality of individual harmonics in a system having periodic torque disturbances to commanded values, including zero. For each harmonic being regulated, a feedback signal having at least one harmonic component due ...	06/09/2009
7534096	Method and system for improving pump efficiency and productivity under power disturbance conditions A system for controlling operation of a progressing cavity pump to maintain the motor operating under power disturbance conditions. For a blackout condition, a backspin controller uses regenerative power to provide controlled deceleration of the pump, counteracting ...	05/19/2009
7437215	Method and system for improving pump efficiency and productivity under power disturbance conditions A system for controlling operation of a progressing cavity pump to maintain the motor operating under power disturbance conditions. For a blackout condition, a backspin controller uses regenerative power to provide controlled deceleration of the pump, counteracting ...	10/14/2008
7330779	Method and system for improving pump efficiency and productivity under power disturbance conditions A system for controlling operation of a progressing cavity pump to maintain the motor operating under power disturbance conditions. For a blackout condition, a backspin controller uses regenerative power to provide controlled deceleration of the pump, counteracting ...	02/12/2008
7321211	Power variation control system for cyclic loads A method and apparatus for managing power demand of a motor in a cyclic load system having a rotational mass is provided. Flat power draw is achieved through continuous manipulation of the motor torque as a function of feedback velocity while using the rotational ma...	01/22/2008
7168924	Rod pump control system including parameter estimator A rod pump control system includes a parameter estimator that determines from motor data parameters relating to operation of the rod pump and/or downhole dynamometer card without the need for external instrumentation, such as down hole sensors, rod load sensors, flo...	01/30/2007
7117120	Control system for centrifugal pumps A control system for the operation of a centrifugal pump which may be used for production of gas and/or oil from a well. The control system includes vector feedback model to derive values of torque and speed from signals indicative of instantaneous current and volta...	10/03/2006
5319295	Digital current regulator A digital current regulator for controlling the operation of an inductance device such as an AC motor. A plurality of independently controllable insulated gate bipolar transistors are selectively enabled to vary the instantaneous phase and magnitude of cu...	06/07/1994
5050135	Magnetostrictive multiple position sensing device A position monitoring device for accurately determining a plurality of distances, velocity or acceleration along a line using a plurality of electromagnets. The position monitoring device includes an ultrasound transducer disposed along a line, an ultraso...	09/17/1991
4891590	Linear resolver utilizing plural nulled coil sets A linear resolver utilizes multiple pairs of nulled coil sets arranged co-linearly for sensing the position of multiple edges of a magnetically permeable object. An excitation coil produces an alternating magnetic field which is normally weakly coupled to...	01/02/1990
4815916	Apparatus for raising a magnetizable object from a stack and for moving it away for further processing A plurality of magnetic elevator devices disposed along the sides of a vertical stack of magnetizable steel objects, such as sheets or rods, separates them and raises the uppermost one vertically. Sensing devices in a control system sense when the object ...	03/28/1989
4795956	Web motion converter A motion converter is disposed at the input to a work station to convert the constant velocity of sheet material as it is payed out from a roll into a cyclic, stop and go motion. The motion converter includes a pair of actuators containing electromagnets ...	01/03/1989
4704568	Linear induction motor transport system A transport and stacker system in which the articles being transported are propelled in their path of travel by the moving magnetic field of a linear induction motor. The magnetic field also functions to attract the moving articles toward the linear motor...	11/03/1987
4491777	Position control of fabricating materials Linear motors are employed to position fabricating materials in work stations. The fabricating material forms the movable element of the linear motor and the positioning of the fabricating material is precisely controlled by a closed loop positioning cont...	01/01/1985

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Assignee: Unico, Inc.