Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1986-01-21
1987-04-07
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
318254, 318334, 361 25, 361 33, H02H 708
Patent
active
046565531
ABSTRACT:
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.
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F. A. Brown, Brushless DC Airmovers Interface with the Design Engineer, Motorcon Mar. 1982 Proceedings, pp. 673-683, 664-665.
Comair Rotron Inc.
Gaffin Jeffrey A.
Pellinen A. D.
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