Resources Contact Us Home
Compensation of motor control using current-RPM relation for a ventilation system

Image Number 14 for United States Patent #8134319.

A method of constant airflow control includes various controls to accomplish a substantially constant airflow rate over a significant change of the static pressure in a ventilation duct. One control is a constant IRPM control, which is primarily used in a low static pressure range. Another control is a constant RPM control, which is primarily used in a high static pressure range. These controls requires neither a static pressure sensor nor an airflow rate sensor to accomplish substantially constant airflow rate while static pressure changes. Also, the method improves the accuracy of the control by correcting certain deviations that are caused by the motor's current-RPM characteristics. To compensate the deviation, the method adopts a test operation in a minimum static pressure condition. Also disclosed is an apparatus for conducting these control methods.

  Recently Added Patents
Tactile output device for computing device notifications
Methods of modulating interleukin-22 and immune response by notch regulators
Malicious attack detection and analysis
Method and apparatus for laser strip splicing
Anti-infective derivatives, method for the production thereof, pharmaceutical compositions containing same and uses of said derivatives in treatment
Three-dimensional filter
  Randomly Featured Patents
Method for treating wastewater
Scent adsorbing liquid formulation
Tension measuring apparatus
Detection device comprising a rugged test with dual transistor
Isokinetic sampling method and system for multiphase flow from subterranean wells
Suture-needle combination with cyanoacrylate tipped sutures
Drill stem for drilling upwardly
WDM optical communication method with pre-emphasis technique and an apparatus therefor
Method and apparatus for attachment and removal of fans while in operation and without the need for tools
Data transfer network on a computer chip utilizing combined bus and ring topologies