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7619379 |
Motor control device and setting method thereof
A motor control device includes a recording module and a controlling module. The recording module has a revolution speed table recording a plurality of predetermined revolution speed values. The...
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7600472 |
Pump control mechanism, printer using the same and pump control method
A pump control mechanism includes a pump unit for feeding liquid to container, a position detector for detecting the position in the reciprocating motion of the pump member, a control table having...
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7547196 |
Method for mitigating rod float in rod pumped wells
Rod Float Mitigation (RFM) methods for rod-pumped oil wells having a variable frequency drive which controls the speed of the motor for the pump. Each method monitors rod loads or a similar...
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7513110 |
Control apparatus of construction machine and method for calculating input torque
A control apparatus of a construction machine includes a hydraulic pump driven by a prime mover, a hydraulic actuator, and a rotation speed detection device for detecting an actual rotation speed...
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7442012 |
Speed control for compressors
Improvements to a compressor which consists in that, as soon as the measured outlet temperature (TO) reaches a certain hysteresis upper temperature limit (HMAX), the actual rotational speed of the...
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7412841 |
Turbo chiller, compressor therefor, and control method therefor
A compressor for a turbo chiller that can stably and efficiently operate in various operating states is provided. An aerodynamic feature map showing a rotating stall line at which rotating stall...
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7387498 |
System and method for noise attenuation of screw compressors
A system is provided for attenuating noise in at least two positive displacement compressors proximately located from each other for use with at least one heating or cooling system. A lead...
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7373208 |
Control apparatus and control method
Each of controllers includes: a transistor; a data processor for executing predetermined data processing and turning the transistor on or off in accordance with the data processing result; a...
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7372221 |
Device for adjusting the armature stroke in a reversible linear drive unit
A device for adjusting the armature stroke in a reversible linear drive unit comprising an excitation coil and an armature displaceable in the magnetic field of the excitation coil according to a...
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7197878 |
Pump control system
A pump control system ( 20 ) for a pump ( 21 ) in a gas turbine engine ( 10 ) is described. The pump control system ( 20 ) comprises demand means ( 22 ) for providing a demand signal ( 23 )...
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7168636 |
Apparatus, method and system for applying substances to forage, grain, and harvested crops
An apparatus, method and system for applying a biologically active or chemical substance to a relatively large volume harvested or pre-harvested crop includes relatively small container of a...
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7044714 |
System and method for controlling pumping of non-homogenous fluids
A controller for controlling the pump unit of an oil well includes a sensor having a first and second probe for placement in the flow of oil from the well bore. Each of the probes contains a...
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7037081 |
High pressure reciprocating pump and control of the same
Pumping requirements for chromatograph applications are for constant flow at high and variable pressures and for accurate programmable control of liquid composition. A two-cylinder pump, pumping...
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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...
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7032659 |
Integrated control system for beam pump systems
The present invention generally provides apparatus and methods of operating a pumping system. The pump control apparatus includes a first sensor for measuring strain on a structure of the well...
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6824362 |
Fan control system
A fan control system uses a closed loop system to adjust the actual operating speed of a fan or fans to a desired operating speed. The desired speed and actual speed are compared in a high gain...
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6779981 |
Fan control system using a microcontroller
A fan control system. The fan motor is operated normally at not greater than a preset maximum rotation speed. The fan control system has a programmable microcontroller to receive an input voltage...
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6776584 |
Method for determining a centrifugal pump operating state without using traditional measurement sensors
A method for determining whether a centrifugal pump is operating within its normal flow operating range includes the steps: of determining a motor torque/TDH relationship over a range of speeds for...
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6758655 |
Process for determining a reference characteristic for controlling a pump
In the process according to the invention for determining a nominal values curve of an installation (H installation (Q), P installation (Q)) for controlling the pump capacity of a pump ( 6 ) driven...
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6741056 |
Air sampler with compensating pump motor speed
A constant flow of air through a personal air sampler is provided regardless of changes in the air flow path, by altering the pump speed as a function of the power taken by the pump. The...
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6609900 |
Dynamic brake with backlash control for peristaltic pump
The present invention involves a dynamic brake for use in a peristaltic (i.e., roller) pump. The dynamic brake avoids backlash, due to counter rotation. In addition, it does not preclude the option...
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6609895 |
Carbon dioxide pump, pumping system, and method of controlling the same
There is disclosed a pump and pumping system for pumping dense phase gases, specifically for injecting carbon dioxide into an oil or gas reservoir that includes a pump, a motor, and a casing in...
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6504338 |
Constant CFM control algorithm for an air moving system utilizing a centrifugal blower driven by an induction motor
A method and apparatus for achieving constant air flow rate economically utilizes an induction blower motor with control settings determining the motor excitation voltage. A memory stores, for a...
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6462494 |
Fan with preset characteristic curve
A tan having a fan wheel and an electric motor driving it, and a control unit for controlling the motor output as a function of fan-specific parameters. An actual-value signal corresponding to an...
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6414455 |
System and method for variable drive pump control
A pump control system and method employs a variable drive for controlling the speed of an AC electric motor driving a cyclic load. A real-time tuning of the frequency and voltage of the AC input to...
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6393338 |
Apparatus and control method for accurate rotary peristaltic pump filling
A filling machine with a rotary peristaltic dispenser that compensates for the nonlinear flow rate characteristic of the dispenser to increase product fill accuracy is disclosed. A computer...
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6379119 |
Hybrid electric and hydraulic actuation system
A system that includes a pump driven by a variable speed electric motor, the pump being directly connected to a hydraulic actuator by an open hydraulic circuit. This setup allows using one motor...
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6135718 |
Interface apparatus for fan monitoring and control
An interface apparatus for fan monitoring and control includes a current source amplifier that generates a programmable current in response to its input voltages. Associated with an output...
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6064797 |
Volumetric flow equalizing drive control wheel
A rotation control for a device to be rotated includes a variable speed DC motor having a constant rotational speed upon receiving a selected fixed voltage electrical input power from an adjustable...
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6010310 |
Fan controller for reducing harmonic fluxuations that produces audible sounds
A motor speed controller for a shaded pole ceiling fan motor having low audible noise, includes a burst period generator for generating gating signals of a duration varying between a preselected...
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6010309 |
Control device for variable capacity pump
A controller, for a variable capacity pump, prevents engine stalls due to rapid changes in operating load by increasing the pump absorption torque when the engine speed is high so as to increase...
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5993422 |
Device for dosing medicinal fluids
A device for dosing medicinal fluids, in particular a feeding solution for enteral alimentation, has a pump unit (2) with a displacement element (15) and a drive unit (3) for the displacement...
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5951258 |
Torque limiting control system for a hydraulic work machine
An apparatus for controlling an electrohydraulic system of a work machine having an engine that drives a variable displacement pump is disclosed. The apparatus includes a pump displacement setting...
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5950439 |
Methods and systems for controlling a refrigeration system
A method and system for controlling a refrigeration system is operative to reduce a system pressure of the refrigeration system. The system pressure is reduced to reduce a start-up current...
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5945802 |
Ground fault detection and protection method for a variable speed ac electric motor
A method and apparatus for detecting the presence of a ground leakage path in an electric motor system including an alternating current (ac) electric motor coupled for receiving electric power from...
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5883489 |
High speed deep well pump for residential use
A power control system in combination with a three-phase AC motor coupled to a water pump enables the operation of the motor at speeds up to 10,800 RPM so as to provide improved pumping capacity...
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5796184 |
Method and an apparatus for stopping a motor-driven pressure generating pump of a system for coating workpieces with atomized liquid coating material
A method and an apparatus are provided for stopping a motor-driven pressure generating pump of a system for coating workpieces with atomized liquid coating material in case of an empty material...
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5755559 |
Apparatus and method for pumping supercritical fluid and measuring flow thereof
In a piston pump for pumping liquid carbon dioxide at a temperature below 30 degrees Fahrenheit and pressures at least as high as 7500 psi, the volume leaving the pump is determined by measuring...
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5743715 |
Method and apparatus for load balancing among multiple compressors
Balancing the load between compressors is not trivial. An approach is disclosed to balance loads for compression systems which have the characteristic that the surge parameters, S, change in the...
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5709533 |
Process and a device for regulating the flow rate of an air current
The invention is based on the premise that, for a given air blower, the current I consumed by the electric motor, the rotational speed N and the air flow rate Q are interconnected, regardless of...
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5664937 |
Precisely flow-controlling pump
In a pump in which dual plunger is reciprocated with cams attached to the rotating shaft of a motor, the delivery pressure of liquid is measured during a certain period in each cycle of the pump....
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5654504 |
Downhole pump monitoring system
The present invention relates to a downhole hydraulic pump monitoring system and more specifically relates to a system which detects and/or anticipates pump malfunctions by processing readings...
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5634772 |
System for controlling operation of turbo type fluid machinery
A system for controlling the operation of a turbo-type fluid machine driven by a variable speed prime mover, which enables the characteristics of the fluid machine to be improved so as to become...
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5494822 |
Organ perfusion device
Devices and methods for perfusing organs by controlling either the perfusion pressure or the perfusate flow rate. The operator may select either method of perfusion control. Also provided are...
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5450743 |
Method for providing constant flow in liquid chromatography system
A method of operating liquid chromatography apparatus. The method includes the steps of determining a given rate of liquid flow desired from a piston pump to the column; establishing for the piston...
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5449275 |
Controller and method for operation of electric fan
A fan speed controller and a method which allows to maintain a constant level of thermal sensation felt by a human body when air temperature, relative humidity, thermal radiation and distance...
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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...
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5393202 |
Process and device for optimizing the transfer by pumping of multiphase effluents
Transfer by pumping of effluents containing at least one gas phase and at least one liquid phase in a transfer line connecting a source of effluents is optimized by interposing on the line, between...
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5370612 |
Infusion apparatus capable of measuring a fluid delivery rate taking a dead band into account
A slit disk having a hole at a specified portion of its flat surface and a plurality of slits at regular intervals at a peripheral portion thereof is mounted to a shaft of an infusion pump. A...
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5340282 |
Drive system for a water pump with rotatable sealing arrangement
Drive system for a water pump unit (7, 8) driven by the shaft of a reversible motor (4) through a partition wall, about said shaft (5) being mounted a first sealing ring (14) fixed to said wall...
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