Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Reexamination Certificate
2006-05-02
2006-05-02
Sircus, Brian (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
Reexamination Certificate
active
07038896
ABSTRACT:
A solid state motor protector has a first PTC chip (positive temperature coefficient of resistivity) electrically connected in series relation with a second resistor having a generally fixed temperature coefficient of resistivity and mechanically coupled to the first resistor in close/direct thermal coupling. Another embodiment has a plate like isolator (52) formed with an opening receiving a polymer PTC chip (58) and having terminals (54, 56) which serve as fixed resistors. Yet another embodiment has an additional PTC resistor and a fixed resistor used in a motor reversing mechanism. Still another embodiment has a fixed resistor on either side of a PTC resistor for use in protecting the windings of a single phase motor. Another embodiment has a stack of polymer PTC resistor chips (82a–82d) with one chip serving as a voltage blocking chip and the other chip serving as fixed resistors.
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French Kevin R.
Sullivan Steven K.
Baumann Russell E.
Demakis James A.
Sircus Brian
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