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
Image stabilization apparatus and image pickup apparatus
Client-managed group communication sessions within a wireless communications system
Post-processing including median filtering of noise suppression gains
Power semiconductor module
Apparatus and method for information processing, program, and recording medium
Portable massage apparatus
Nuclear fission reactor, a vented nuclear fission fuel module, methods therefor and a vented nuclear fission fuel module system
  Randomly Featured Patents
Optical element and optical apparatus
Hardware inhibit for a disk drive digital servo control system
Commemorative book tiles
Target detection in aerosols using active optical sensors and method of use thereof
Method and system for synchronous operation of linked command objects
Selectable field infrared imager and lens set
Soft grip handle
Motor having rotation balancing member
Multi-band antenna system
Hydrodechlorination of higher chloromethanes