Starting circuit for single-phase induction motor

Details Starting circuit for single-phase induction motor Starting circuit for single-phase induction motor

2006-02-28

2006-02-28

Ip, Paul (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S783000, C361S103000, C361S027000, C361S029000

Reexamination Certificate

active

07005827

ABSTRACT:
A starting circuit for a single-phase induction motor includes a motor starting positive characteristic thermistor and a triac arranged in a series connection, and a triac control positive characteristic thermistor connected in parallel with the motor starting positive characteristic thermistor, and including one terminal thereof connected to a gate of the triac. The triac control positive characteristic thermistor has a volume in the range of about 4.5 mm3to about 30 mm3. The relationship of (√2×V×sin 45°)/R≧I is maintained with the triac control positive characteristic thermistor within an operating temperature range, where V represents a root-mean-square value of a power source voltage, R represents a resistance of the triac control positive characteristic thermistor, and I represents a gate turn-on current of the triac. The gate turn-on current I at an operating temperature of about 25° C. is about 20 mA or less.

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