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Class Information
Number: 417/44.11
Name: Pumps > Condition responsive control of pump drive motor > By control of electric or magnetic drive motor > Responsive to change in electrical operating characteristic
Description: Apparatus wherein the electric drive motor comprises a sensing means where an operating characteristic changes in response to a change in an electrical current drawn by the motor or a change in a voltage across the motor or a change in a phase shift of the motor.

Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
8690542 Method and arrangement for soft start up of a pump system Apr. 8, 2014
8690549 Centrifugal pump unit Apr. 8, 2014
8672641 Electric submersible pumps Mar. 18, 2014
8674652 Motor control device Mar. 18, 2014
8657585 Apparatus for driving compressor of air conditioner and method for driving the same Feb. 25, 2014
8657586 Voltage compensating piston fuel pump and fuel delivery system therewith Feb. 25, 2014
8657587 End of stroke detection for electromagnetic pump Feb. 25, 2014
8651823 System and method for a pump with reduced form factor Feb. 18, 2014
8636476 Feeding system for an inductive load from an energy source with variable power Jan. 28, 2014
8628310 Fan system having improved availability and method for its operation Jan. 14, 2014
8622713 Method and apparatus for detecting the fluid condition in a pump Jan. 7, 2014
8602743 Method of operating a safety vacuum release system Dec. 10, 2013
8602745 Anti-entrapment and anti-dead head function Dec. 10, 2013
8602746 Electrical system for a pump Dec. 10, 2013
8602747 Ventilation device and electrical equipment in which same is installed Dec. 10, 2013
8596987 Electric compressor control device Dec. 3, 2013
8573952 Priming protection Nov. 5, 2013
8571798 System and method for monitoring fluid flow through an electrical submersible pump Oct. 29, 2013
8562304 Electrical motor activation method having load torque adaptation Oct. 22, 2013
8556593 Method of controlling counter-rotating axial-flow fan Oct. 15, 2013
8550218 Remote control for braking system of progressive cavity pump Oct. 8, 2013
8550789 Linear compressor Oct. 8, 2013
8540493 Pump control system and method Sep. 24, 2013
8535015 Rinsing device and method for the operation thereof Sep. 17, 2013
8500413 Pumping system with power optimization Aug. 6, 2013
8480373 Filter loading Jul. 9, 2013
8480376 Device, computer program product and computer-implemented method for backspin detection in an electrical submersible pump assembly Jul. 9, 2013
8475136 Compressor protection and diagnostic system Jul. 2, 2013
8475137 Electric-motor-driven oil pump control system Jul. 2, 2013
8469675 Priming protection Jun. 25, 2013
8469674 Operation control device and method of compressor Jun. 25, 2013
8465263 Dynamic control of an electric drive Jun. 18, 2013
8444394 Pump controller system and method May. 21, 2013
8430642 Controlling apparatus for linear compressor Apr. 30, 2013
8425202 Modular, universal and automatic closed-loop pump pressure controller Apr. 23, 2013
8371824 Apparatus and method for controlling linear compressor with inverter unit Feb. 12, 2013
8356983 Airflow control for variable speed blowers Jan. 22, 2013
8353678 Controller for a motor and a method of controlling the motor Jan. 15, 2013
8348624 Efficiency optimized air flow apparatus and method Jan. 8, 2013
8342812 Variable speed air compressing system having AC and DC power sources Jan. 1, 2013
8342811 Sensor assembly, a fluid pump and a cooler Jan. 1, 2013
8337166 Pump and pump control circuit apparatus and method Dec. 25, 2012
8313306 Method of operating a safety vacuum release system Nov. 20, 2012
8297937 Pump control apparatus, system and method Oct. 30, 2012
8297938 System and method of controlling a linear compressor Oct. 30, 2012
8292595 Method of constant airflow control for a ventilation system Oct. 23, 2012
8287246 Systems and methods for automatic forward phasing determination in a downhole pump system Oct. 16, 2012
8282359 Rotary blood pump and control system therefor Oct. 9, 2012
8282361 Controller for a motor and a method of controlling the motor Oct. 9, 2012
8283879 Braking controller of a three-phase permanent magnetic brushless DC motor for directly driving a screw pump Oct. 9, 2012

1 2 3 4 5

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