Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1977-04-08
1979-02-27
Rubinson, Gene Z.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318786, 318416, H02P 540
Patent
active
041421361
ABSTRACT:
A control circuit is adapted for use with a power supply circuit having a motor arranged in series with an SCR starter assembly and a power source, and having a bypass circuit arranged in parallel with the SCR starter assembly. The control circuit includes an operator for a main contactor arranged between the SCR assembly and the power source, an operator for a bypass contactor arranged in the bypass circuit, and a trigger circuit for operating the SCR starter assembly. The control circuit includes three timers for sensing three successive time intervals. Activation of the main operator closes the main switch and causes the first timer to begin counting a first time interval. After the first time interval, the SCR trigger circuit is fired to operate the SCR starter assembly and to limit the in-rush current supplied to the motor, and to cause the second timer to begin to count a second time interval. After the motor has reached its operating speed, the end of the second time interval causes the bypass operator to close the bypass contactor, and also causes the third timer to begin counting the third time interval. After the third time interval, the SCR trigger circuit is deactivated, to effectively remove the SCR starter assembly from the power supply circuit.
REFERENCES:
patent: 3045163 (1962-07-01), Collom
patent: 3143694 (1964-08-01), Chiasson
patent: 3189810 (1965-06-01), MacGregor
patent: 3573580 (1971-04-01), Shinozaki
patent: 3652924 (1972-03-01), Dieterich et al.
patent: 3742370 (1973-06-01), Hansen
patent: 4015178 (1977-03-01), Phillot et al.
Mollenberg-Betz Machine Company
Rubinson Gene Z.
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