Variable speed drive

Details Variable speed drive Variable speed drive

1981-11-18

1983-03-29

Tapolcai, William E.

Pumps

Condition responsive control of pump drive motor

With control of pump drive transmission

236 84, 474 26, F04B 4900

Patent

active

043781993

ABSTRACT:
The fan motor of a variable speed drive for a fan is positioned in response to thermostatic demand and a feedback signal responsive to the position of the variable speed drive. Changing thermostatic demand causes movement of the fan motor until an equilibrium position is reached again.

REFERENCES:
patent: 2158250 (1939-05-01), Peters
patent: 2289287 (1942-07-01), Hallinan
patent: 2308507 (1943-01-01), Hallinan
patent: 2308655 (1943-01-01), Hallinan
patent: 2479069 (1949-08-01), Hallinan
patent: 2512425 (1950-06-01), Hallinan
patent: 2838243 (1958-06-01), Peters
patent: 3678773 (1972-07-01), Rohrbach et al.
patent: 4345878 (1982-08-01), Griffin

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