Pumps – Condition responsive control of pump drive motor – By control of electric or magnetic drive motor
Patent
1997-10-29
1999-09-07
Freay, Charles G.
Pumps
Condition responsive control of pump drive motor
By control of electric or magnetic drive motor
F04B 4900
Patent
active
059476915
ABSTRACT:
A winding circuit for use in a fan includes first and second integrated circuits that each include a transistor for powering first and second fan windings in the fan, and at least one of a thermal shutdown element that switches the winding circuit "off" if the integrated circuit reaches a predetermined temperature, and a current regulating circuit. The fan includes a rotor having a magnet, and a stator having a magnet sensor to alternatively transmit current to the first and second windings, which also are located in the stator. The integrated circuits may be autoprotected MOSFETs and the magnet sensor may be a Hall effect sensor.
REFERENCES:
patent: 4656553 (1987-04-01), Brown
patent: 5524556 (1996-06-01), Rowlette et al.
patent: 5531807 (1996-07-01), McCombs
patent: 5600550 (1997-02-01), Cook
"OMNIFETS-Fully Autoprotected Power MOSFETs," Microelectronics Marketing News, May 1996; Issue 15, pp. 6-7.
"OMNIFETS -Fully Autoprotected Power MOSFETs", Microelectronics marketing News, Issue 15, at pp. 6-7, May 1996.
Brown Fred A.
Gorrino Octavio
Comair Rotron Inc.
Evora Robert Z.
Freay Charles G.
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