Electrical transformer with reduced fan noise

Details Electrical transformer with reduced fan noise Electrical transformer with reduced fan noise

1995-07-31

1998-01-20

Berhane, Adolf

Inductor devices

With vibration control

181202, H01F 1500

Patent

active

057105332

ABSTRACT:
An electrical transformer includes a housing, a transformer core and winding subassembly located in the housing, and a cooling fan subassembly. The cooling fan subassembly includes a variable speed fan located outside the housing, a temperature sensor located near the housing, and a controller having an output port connected to the variable speed fan and an input port connected to the temperature sensor. The controller reduces the fan speed (and hence the fan noise) when a lower fan speed can maintain the desired temperature as sensed by the temperature sensor. Preferably, the electrical transformer further includes an active mount subassembly and/or (when the housing includes a tank containing transformer fluid) a mechanism for varying the dynamic pressure of such transformer fluid.

REFERENCES:
patent: 3451503 (1969-06-01), Twomey
patent: 4146112 (1979-03-01), Usry
patent: 4306209 (1981-12-01), Choschzick et al.
patent: 4724413 (1988-02-01), Kataoka
"Fighting Noise with Noise", by William B. Canover, Noise Control, 1956, 92, pp. 78-82 (copy unavailable).
"Active Noise Control Systems", by R.R. Leitch and M.O. Tokhi, IEEE Proceedings, vol. 134, Pt. A, No. 6, Jun. 1987, pp. 525, 528, and 545.

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