Thermal control variable speed DC brushless fan

Details Thermal control variable speed DC brushless fan Thermal control variable speed DC brushless fan

1991-10-23

1993-03-30

Smith, Leonard E.

Pumps

Condition responsive control of pump drive motor

Having ambient condition responsive means

318473, 388934, 417 32, F04D 2702

Patent

active

051978580

ABSTRACT:
A thermal control variable speed DC brushless fan, especially a DC brushless fan which may change speed in accordance with the temperature sensed, includes a fan speed control circuit and a DC brushless fan. The fan speed control circuit is composed of drive ICs, operation amplifiers, transistors, diodes, capacitors resistors, and a thermal sensor. Under normal conditions, the change in the fan's rotation speed relation to the temperature is almost linear, but when the thermal sensor is open or shorted the speed control circuit of the fan causes the fan to operate at full speed to maintain a cooling effect.

REFERENCES:
patent: 3544236 (1970-12-01), Brookmire
patent: 4506199 (1985-03-01), Asche
patent: 4535275 (1985-08-01), Muller
patent: 4609854 (1986-09-01), Yamamoto et al.
patent: 4620139 (1986-10-01), Egami et al.
patent: 4644238 (1987-02-01), Hirosaki
patent: 4722669 (1988-02-01), Kundert
patent: 4806832 (1989-01-01), Muller

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