Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1982-07-15
1984-03-20
Truhe, J. V.
Electricity: motive power systems
Induction motor systems
Primary circuit control
361154, 361 33, 361 92, 318806, H02P 528
Patent
active
044383835
ABSTRACT:
Electric motor starter circuits for operating motors which cannot be restarted under load, but which maintain sufficient momentum during merely momentary interruptions of AC power to continue normal operation upon power restoration. Conventional motor starter circuits drop the motor off line, even in the event of momentary interruptions. The starters disclosed herein prevent unintended and unnecessary equipment down time as a result of AC motor starters dropping out during mere momentary power interruptions through the provision of a delayed drop out circuit including a DC voltage storage capacitor connected to the coil of the motor starter relay subsequent to the initiation of normal AC energization. In one embodiment, actual motor rotation is sensed to determine when to allow the motor starter relay to drop out.
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Cutler-Hammer Technical Information Publication No. A400J, "A-C Reduced Voltage Three Phase Autotransformer Starter Size 6" (Nov. 1, 1974).
Etheridge Electric, Inc.
Keane Patrick
Truhe J. V.
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