Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1984-02-17
1986-08-12
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318785, H02P 164
Patent
active
046058885
ABSTRACT:
The switching device of the present invention electrically connects a single-phase induction motor's starting winding to the motor's circuitry upon start-up, and disconnects it once the motor reaches a first predetermined speed. If the motor's speed drops below a second predetermined speed, the switching device reconnects the starting winding to the motor's circuitry until the motor again reaches the first predetermined speed. At start-up, diode bridge D1 turns ON, turning ON SCR S2. With the SCR ON, the diode bridge is short-circuited, drawing a large current through the bridge's a.c. side. This current flows through resistor R8, and the voltage drop across R8 is large enough to turn triac S1 ON. Thus, current flows through starting coil L2. When the motor reaches a first predetermined speed, the voltage across the starting coil is large enough to turn NPN transistor TR2 ON, turning PNP transistor TR1 ON. Accordingly, the SCR turns OFF, eliminating the large current drawn through the a.c. side of the diode bridge, and the triac turns OFF. If the motor speed dips below a second predetermined value, lower than the first, transistor TR1 is cutoff, and the triac subsequently turns back ON until the first predetermined speed is reached.
REFERENCES:
patent: 4366426 (1982-12-01), Turles
patent: 4399394 (1983-08-01), Ballman
patent: 4468604 (1984-08-01), Zaderej
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