Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1974-10-24
1976-08-24
Rubinson, Gene Z.
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318221E, 318225R, H02P 144
Patent
active
039769240
ABSTRACT:
A single phase, two pole A.C. split-phase unidirectional induction motor uses a current sensing relay and connects a main winding with a single phase A.C. electrical power source while a pair of associated relay-contacts operably connect a starting winding to the power source with the contacts closing in response to a sensed first predetermined main winding current and opening in response to a second lesser predetermined main winding current. Each of the starting winding poles are spaced from each of the main winding poles by less than ninety physical degrees in the direction of rotor rotation in order to provide the first predetermined main winding current at a first predetermined rotor speed and the second predetermined main winding current at a second predetermined speed and torque to maintain the heating of the starting winding within a predetermined temperature while the pair of relay contacts remain in the closed condition.
REFERENCES:
patent: 2139531 (1938-12-01), Wedge et al.
patent: 2588257 (1952-03-01), Lewus
patent: 2711503 (1955-06-01), Elliott
patent: 3204167 (1965-08-01), Zigler
A.O. Smith Corporation
Rubinson Gene Z.
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