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
Video processing system and device with encoding and decoding modes and method for use therewith
Prevention and reduction of blood loss
Rechargeable battery
Media processing method and device
Advanced joint detection in a TD-SCDMA system
Requirements model comparative analysis method for effort estimation in customizing a network monitoring and control system
  Randomly Featured Patents
Method for heat treating a semiconductor wafer
Valve assembly for a two-stroke engine
Expandable intervertebral implant and associated instrumentation
Compact cassette loading device with movable tape guide member
Method of measuring a channel boosting voltage in a NAND flash memory device
Pump support apparatus for a melter tank for thermoplastic material and mounting structure therefor
Medical electrical lead
Blends of encapsulated biocides
Steerable platformed vehicle for play or industrial use