Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1991-12-11
1993-08-31
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318806, 318481, H02P 504
Patent
active
052412539
ABSTRACT:
A controller for operating a two-speed fan motor at one of two speeds and for selecting the appropriate speed in response to conditions such as a maximum and minimum duct static pressure in a fan unit having moveable inlet guide vanes for controlling air flow rates through the fan unit when employed in a variable air volume system. Position sensing switches are provided on the fan unit for indicating to the controller when the inlet guide vanes are in their preferred switching positions, which may be full open or full closed. The controller then selects one of the two fan speeds as appropriate within an operating deadband limit which serves to prevent undesirable changes of motor speed.
REFERENCES:
patent: 3887854 (1975-06-01), Parks
patent: 3932729 (1976-01-01), Schangen
patent: 4262225 (1981-04-01), Hildebrandt et al.
patent: 4341987 (1982-07-01), Fisher
patent: 4384312 (1983-05-01), Fry
patent: 4388581 (1983-06-01), Bhatnagar
patent: 4403178 (1983-09-01), Kaminski
patent: 4453118 (1984-06-01), Phillips et al.
patent: 4689533 (1987-08-01), Yang
American Standard Inc.
Beres William J.
Ferguson Peter D.
Martin David
O'Dirscoll William
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