Fan speed controller

Details Fan speed controller Fan speed controller

1985-08-29

1988-02-02

Croyle, Carlton R.

Pumps

Condition responsive control of pump drive motor

Responsive to pump or pump fluid temperature

318334, 318473, 236DIG9, F04B 4910

Patent

active

047226692

ABSTRACT:
The fan speed controller disclosed herein is particularly useful in the cooling of electronic equipment and provides a feedback control characteristic from an exhaust air temperature sensor such that the change in outlet temperature over the range of air flow rates is substantially equal to the change in temperature rise of typical heat generating devices in electronic equipment over that same range. Accordingly, device temperature is maintained substantially constant over a range of varying input air temperatures. Preferably, the controlled fan includes a d.c. motor which is energized in a pulsed d.c. mode to prevent stalling or instability at low flow rates.

REFERENCES:
patent: 3353078 (1967-11-01), Maynard
patent: 3543119 (1970-11-01), Bauer et al.
patent: 4425766 (1984-01-01), Claypole

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