Method of transition between controls for a ventilation system

Details Method of transition between controls for a ventilation system Method of transition between controls for a ventilation system

2008-01-18

2010-02-02

Leykin, Rita (Department: 2837)

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Field control, or field and armature control, by analog...

C388S800000, C318S400010, C318S400410, C417S044100, C417S044110, C454S228000, C454S229000

Reexamination Certificate

active

07657161

ABSTRACT:
A method of constant airflow control for a ventilation system is disclosed. The method 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 I·RPM 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. This is because these controls use only intrinsic control variables which are electric current and rotational speed of the motor. 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.

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