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| Number | Title | Issue Date |
| 7033147 | Centrifugal fluid pump assembly with flow rate calculating section A centrifugal fluid pump assembly includes a body section and a control mechanism 6. The body section includes a housing, an impeller rotatable within the housing, and a motor for rotating the impeller. The pump assembly includes a motor current flow rate-related da... | 04/25/2006 |
| 6940245 | Downhole compressor system with a feedback sensor A downhole compressor system is disclosed for assisting in extracting gas from the well. The system comprises a compressor 14, an electric motor 10 for driving the compressor 14 which motor has a stator winding and a rotor 12 and, in use,... | 09/06/2005 |
| 5441389 | Eddy current drive and motor control system for oil well pumping An eddy current coupling with an electrically controllable field current is used to rotatably connect a drive motor to an oil well pumping mechanism where the eddy current drive speed is controlled to a reference speed using a speed feedback control syste... | 08/15/1995 |
| 5324170 | Pump control apparatus and method Disclosed herein is an apparatus and method for controlling electrically powered liquid-moving pumps, particularly bilge and sump pumps. The apparatus is characterized by the fact that no portion thereof need be located in the hostile environment of the b... | 06/28/1994 |
| 4971522 | Control system and method for AC motor driven cyclic load A control system for an AC motor driven cyclic load, such as a beam pumping unit, includes a flywheel, transducer, tachometer, outside set point source, controller, and variable frequency power supply. The flywheel is rotatably connected between the motor... | 11/20/1990 |
| 4305306 | Drive assembly A rotatable input shaft (1) drives a rotatable output shaft (18) through a roller (7) which roller is displaceable along its rotational axis (8) while maintaining driving engagement with drive faces (6 and 14) of the shafts (1 and 18) respectively to vary... | 12/15/1981 |
| 4212590 | Method and apparatus for the continuous regulation of rotary hydrodynamic pumps A regulator for controlling the speed of a rotary hydrodynamic pump algebraically sums a preselected value with a signal related to the pump speed and raised to a predetermined power. A root of the combined signals is compared with a flow rate or liquid l... | 07/15/1980 |
| 4208171 | Hydrodynamic pump units and regulators therefor A fluid pumping system includes a pump driven at a variable speed by a motor connected to the pump by a fluid cooled transducer. A regulator, connected to the transducer, controls, the speed of the pump responsive to an analog signal related in value to t... | 06/17/1980 |
| 4193742 | Vacuum pump assembly with built-in shutoff valve A vacuum pump assembly is provided which includes a built-in pneumatic valve for closing the suction port of a vacuum pump of the assembly with an auxiliary valve being provided for controlling operation of the pneumatic valve. An electromagnetic valve is... | 03/18/1980 |
| 3994623 | Method and apparatus for controlling a dynamic compressor A method is disclosed for a cascade control of a dynamic compressor to maintain a constant mass flow rate to a process. The method consists of a successive junction of control loops for controlling the speed of rotation, the pressure in the delivery, and ... | 11/30/1976 |
| 3935707 | Hydraulic control system A hydraulic control system includes a generating circuit for providing power to a work function. A driving apparatus operates the generating circuit. A control circuit is connected to the generating circuit and the driving apparatus for permitting deliver... | 02/03/1976 |
| 3930743 | Fluidic governor system A fluidic governor system for controlling the speed of a drive shaft output of a prime mover, comprising a fluidic governor, a reciprocating or vane compressor, a fluidic RC filter, and a valve. The compressor is mechanically coupled to and driven by the ... | 01/06/1976 |
