Process and a device for regulating the flow rate of an air curr

Details Process and a device for regulating the flow rate of an air curr Process and a device for regulating the flow rate of an air curr

1996-12-27

1998-01-20

Thorpe, Timothy

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

417 20, 417 22, 417 45, 417 43, 454 75, 62186, F04B 4900

Patent

active

057095337

ABSTRACT:
The invention is based on the premise that, for a given air blower, the current I consumed by the electric motor, the rotational speed N and the air flow rate Q are interconnected, regardless of the dynamic pressure, by a law Q=f(I, N) which can be experimentally determined on a ventilation bench. In order to perform any adjustment, I and N are measured, from which a calculator derives Q by means of the above-mentioned law. The comparison of the calculated value with the desired flow rate Qd provides an error signal which is applied to a control device which determines the supply voltage (U) of the motor of the blower. The invention is applicable to heating or air-conditioning installations for the passenger space of vehicles.

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