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
Apparatus with a local timing circuit that generates a multi-phase timing signal for a digital signal processing circuit
Methods and apparatus for imaging in conjunction with radiotherapy
Fluid discrimination device
Fractal method for detecting and filling data gaps within LiDAR data
Storage system comprising multiple microprocessors and method for sharing processing in this storage system
Laser processing machine
Relative pose estimation of non-overlapping cameras using the motion of subjects in the camera fields of view
  Randomly Featured Patents
Means and method for thermoregulating magnets within magnetic resonance devices
Crawl space door and frame with exterior flange
Medical support
Auto-flushing medical fluid injection system
Idle speed control for DISI engines
Recorder/player device with stationary recording medium and constant speed signal head drive
Method for shaping tetrafluoroethylene resin pipe
Support system for a tiltable structure for a work vehicle
Holiday ornament
Surgical drape having a pocket-forming feature