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
Server-side web analytics system and method
Ranging method and apparatus in passive optical network
System, method and computer program product for monitoring and controlling network connections from a supervisory operating system
Pet bed
Wearable display device
Audio signal clip detection
  Randomly Featured Patents
Ozone gas measurement apparatus
Method and device for changing printing elements in a printing unit of a press
Method and system for virtual cinematography
System for purifying exhaust gas
Thermosetting resin composition
Ultrasonic blood stream observing apparatus
Process dispatching method
Tools with abrasive segments
Vacuum insulated building panel
Lithium secondary battery