Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1995-02-13
1997-04-01
Wysocki, Jonathan
Electricity: motive power systems
Induction motor systems
Primary circuit control
H02D 100
Patent
active
056170017
ABSTRACT:
A starting circuit for use with single phase induction motors such as capacitor run and capacitor start, capacitor run motors is shown having a triggerable semiconductor (Q1, Q2 and Q3) serially connected to the auxiliary winding (AW) across the power supply (L1, L2). A resistor (RA) is serially connected at (J1) to the main winding (MW) to form a voltage divider to aid in providing triggering current to the triggerable semiconductor. A thermistor (PTC) is connected between the gate and the voltage divider junction (J1). The triggerabIe semiconductor is shown as a triac (Q1) in certain embodiments and as back to back SCRs (Q2 and Q3) in other embodiments. In high current motors the voltage divider resistor (RA) is shown thermally coupled to the thermistor (PTC).
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Geishecker Stephen P.
Nacewicz Stanley J.
Baumann Russell E.
Donaldson Richard L.
Grossman Rene E.
Texas Instruments Incorporated
Wysocki Jonathan
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