Variable speed fan failure detector

Details Variable speed fan failure detector Variable speed fan failure detector

1996-06-28

1998-08-04

Ramirez, Ellis B.

Boots, shoes, and leggings

364557, 361 6, 361695, H02H 708, H05K 720

Patent

active

057904308

ABSTRACT:
The failure of a motor to maintain a commanded speed is detected by the disclosed variable speed fan failure detector. The commanded speed varies as a function of temperature, such that at temperatures below a first predetermined temperature the motor runs at minimum speed and at temperatures above a second predetermined temperature it runs at maximum speed, with the speed varying substantially linearly between the first predetermined temperature and second predetermined temperature. The failure detector develops a first voltage proportional to motor speed, senses a temperature at a point where a predetermined temperature is to be maintained, develops a second voltage proportional to a desired speed based on the sensed temperature. The second voltage has a first value at sensed temperatures below the first predetermined temperature, a second value at sensed temperatures above the second predetermined temperature and a value which varies substantially linearly between the first and second values, as sensed temperature varies between the first predetermined temperature and second predetermined temperature. The failure detector compares the first and second voltages and provides an alarm output if the first voltage drops below the second voltage. The invention is particularly applicable to motor driven fans cooling computer equipment such as the processors in a server.

REFERENCES:
patent: Re33167 (1990-02-01), Moosmann et al.
patent: 5099181 (1992-03-01), Canon
patent: 5526289 (1996-06-01), Dinh et al.
patent: 5534854 (1996-07-01), Bradbury et al.
patent: 5563486 (1996-10-01), Yamamoto et al.
patent: 5568350 (1996-10-01), Brown
patent: 5574667 (1996-11-01), Dinh et al.

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