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
Level-shift circuit, electro-optical device, and level shift method
Brushless motor drive apparatus and drive method
Apparatus and method for providing vehicle data for testing product
Control unit of a ride level control system, and ride level control system
Thin film transistor and flat panel display device including the same
Method for fabricating a nitrided silicon-oxide gate dielectric
Computer product, information retrieval method, and information retrieval apparatus
  Randomly Featured Patents
Sealing assembly for the aft end of a ceramic matrix composite liner in a gas turbine engine combustor
Meat product
Toll-free directory assistance with preferred advertisement listing
High density disk unit and disk medium
Semiconductor device with stacked semiconductor elements
Process for preparing a catalyst for conversion of cyanopyridines to nicotinamides
Hydraulic binder and cement compositions containing photocatalyst particles
Communications workstation
Parallel processing system with processor array having SIMD/MIMD instruction processing
High porosity calcium silicate mass for storing acetylene gas