DC fan speed control

Electricity: motor control systems – Open loop speed control system for dc motor with commutator – Analog armature control

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Details

388934, 318599, H02P 729

Patent

active

048560782

ABSTRACT:
A simple pulse width modulator speed control for a brushless DC "pancake" type fan motor utilizes a type 555 timer for driving a transistor switch, connected in series between the DC voltage supply and the fan motor, at about a 10 Hz rate. The duty cycle of the pulsed output of the timer is controllable by a variable resistor, which in the preferred embodiment comprises a thermistor for controlling the fan speed as a function of temperature. The fan motor is restarted on each cycle of full voltage amplitude pulses and consequently will start under all operating conditions.

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"Self-Contained Speed Controller Allows DC Fans to Idle at One-Half Rated Speed", Control Resources Inc., Smart Fan Div, Box 315, Harvard, MA 01451, phone (617)456-8763.

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