Motor start system with two dissimilar PTCR elements

Details Motor start system with two dissimilar PTCR elements Motor start system with two dissimilar PTCR elements

1975-03-12

1976-06-22

Miller, J D

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

317142TD, 318221H, H02P 144

Patent

active

039653927

ABSTRACT:
A motor start and run system for a single phase motor provides a predetermined period for starting the motor during which power is delivered to a start winding of the motor. It also provides a time delay after the motor is deenergized before the motor may be restarted. These two control times are essentially determined by thermal time constants associated with a package having two PTCRs. These two PTCRs are thermally coupled and have different anomaly temperatures. A dual-PTCR package is also disclosed for use in said motor start system having provision for strongest thermal coupling with the environment for the PTCR having the higher anomaly temperature.

REFERENCES:
patent: 2618721 (1952-11-01), Clark
patent: 3544869 (1970-12-01), Plouffe et al.
patent: 3562614 (1971-02-01), Gramkow
patent: 3643142 (1972-02-01), McBride, Jr.
patent: 3852648 (1974-12-01), Barry et al.

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