Electrical resistors – Resistance value responsive to a condition
Patent
1974-11-06
1976-06-29
Albritton, C. L.
Electrical resistors
Resistance value responsive to a condition
29617, 338 25, H01C 700
Patent
active
039672298
ABSTRACT:
A heavy duty PTC resistor with a pressed and sintered hollow cylindrical body of a ceramic composition which has two end faces in a radial plane with a connection contact on each end face.
A heavy duty PTC resistor sintered body of a ceramic composition which has two end-faces carrying a connection contact; the invention also concerns a method of manufacturing such PTC-resistor.
High duty PTC-resistors are required for some purposes. If for example a PTC-resistor is used as a starting device for a single-phase motor, it has to be designed to deal with almost the entire mains voltage and to carry power of 500 W or more. The usual cylindrical bodies, provided at their two end-faces with connection contacts, frequently exhibit cracks under loads of this kind.
A high-duty PTC-resistor is thus known (German Patent Specification OS 1 465 349) which is made up of a stack of solid or hollow flat cylindrical discs, the end-faces of the superposed discs being interconncted by a contact layer.
REFERENCES:
patent: 2358211 (1944-09-01), Christensen et al.
patent: 2937354 (1960-05-01), Mazzarella et al.
patent: 3340490 (1967-09-01), Obenhaus
patent: 3742419 (1973-06-01), Martzloff
Albritton C. L.
Danfoss A/S
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