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
Processing abstract derived entities defined in a data abstraction model
Method for processing an algae medium containing algae microorganisms to produce algal oil and by-products
Method for transmitting a signal
Front exterior of an automotive tail lamp
Context-sensitive views
Character input device and program for displaying next word candidates based on the candidates' usage history
Mounting apparatus for PCI card
  Randomly Featured Patents
Plastic container package
Vascular wound closing apparatus and method
Method of mounting memory device on PCB for memory module
Concrete form splash funnel
Catalyst based on a halogenated alumina, its preparation and use for the isomerization of normal C4-C6 paraffins
Snap on barriers for terminal boards and fuse blocks
Liquid crystal display having adjustable effective voltage value for display
Insulated and waterproof shoe
Portable urinal closet
Maize acetyl CoA carboxylase encoding DNA clones