Multi-speed fan assembly

Details Multi-speed fan assembly Multi-speed fan assembly

1980-07-16

1982-10-05

Gluck, Richard E.

Pumps

Condition responsive control of pump drive motor

With plural separate drive motors for single pump unit

417 12, 417 32, 417362, 318102, 236 1EA, 236 49, F04B 4902, F04B 3504, H02D 158

Patent

active

043526357

ABSTRACT:
Apparatus for rotating a fluid impeller of a centrifugal or axial flow fan, at multiple speeds. A fan is provided with a first and a second electric motor for drivingly rotating a fluid impeller at relatively fast and slow speeds, respectively. The rotor of the first motor directly drives the fluid impeller; the second motor is connected to the impeller shaft of the fan through a belt drive, with pulleys sized to reduce the impeller's rotational speed relative to that of the second motor.
Only one of the motors is provided with a start winding. Control means selectively energize the first and second motors, and are operative to energize the one motor long enough to bring the other motor up to operating speed.

REFERENCES:
patent: 2073404 (1937-03-01), Hobbs
patent: 2252762 (1941-08-01), Feldhausen
patent: 2397183 (1946-03-01), Kilgore et al.
patent: 2936107 (1960-05-01), Blackburn
patent: 3650633 (1972-03-01), Benoit
patent: 4092088 (1978-05-01), Nemesi
patent: 4108580 (1978-08-01), Felter

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