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AssigneeComair Rotron, Inc.
InventorFred A. Brown
Estimating the term…
A brushless DC fan with a winding supply circuit having an internal voltage regulator can afford current limiting and thermal protection and provide various desired fan speeds without alteration of the basic fan circuit, the windings, or other manufacturing items. A voltage setting circuit element can set fan speed externally and can be used to establish various fan speeds. An internal voltage establishing circuit element sets the maximum speed. The regulator replaces the fan's protective thermistor to shut down the voltage to the windings when locked rotor occurs. Bringing out a lead for the purpose of connecting a speed controlling resistor, thermistor, or active programming means to the internal circuitry enables the fan's end user to alter operation as needed.
In a brushless DC motor driven, equipment cooling fan having a permanent magnet rotor in an impeller, a centrally mounted stator wound with windings, ends of the windings being electrically connected to a winding supply circuit centrally mounted with the stator, a commutation and switching circuit centrally mounted with the stator and the energization circuit, the impeller having blades supported thereon radially outward of the stator;
A brushless DC motor driven fan including a permanent magnet rotor in an impeller, a stator wound with windings to form at least one coil, fan housing means, fan circuitry housed in the fan housing means including a winding supply circuit and a commutation and switching circuit, the commutation and switching circuit including switching means for directing DC current to windings of the stator and commutation controlling means responsive to the position of the rotor to control the timing of energization of the windings of the stator, the winding supply circuit housed in the fan further including a voltage regulator integrated circuit having an output connection coupled in current conducting relation to the windings of the stator for conducting current thereto under control of the energization circuit, the voltage regulator integrated circuit having an output voltage controlling circuit element connection external of the housing of the fan for establishing the output voltage provided across the windings by the internal voltage regulator integrated circuit, whereby the voltage regulator and a selected circuit element connected externally of the fan to said circuit element connection set the fan speed.
A method of programming fan speed in a brushless DC motor driven fan including the steps of:
Dependencies are inferred from the claim text.