Dual duty drive with induction motor

Details Dual duty drive with induction motor Dual duty drive with induction motor

1973-08-16

1976-02-24

Rubinson, G. Z.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

310 99, H02P 132

Patent

active

039406687

ABSTRACT:
A dual duty drive for an actuating mechanism, for example a pump or a fan, incorporating an induction motor and an electromechanical reduction gear unit. The economical and reliable operation in the rated duty is ensured by delta connecting the motor windings, and with current being applied across the field winding of the electro-mechanical reduction gear unit, the latter is caused to operate with a gear ratio close to unity. Under a fractional load duty, the motor windings are star connected and the electro-mechanical reduction gear unit is deenergized, causing the latter to operate in the step-down reduction mode.

REFERENCES:
patent: 2317266 (1943-04-01), Galt, Jr.
patent: 2549896 (1951-04-01), Dunham
patent: 2867127 (1959-01-01), Fehr
patent: 2912607 (1959-11-01), Duncan
patent: 3026460 (1962-03-01), Fath
patent: 3171995 (1965-03-01), Ponsy

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