Electricity: motive power systems – Induction motor systems – Reversing
Patent
1977-03-11
1979-01-09
Rubinson, Gene Z.
Electricity: motive power systems
Induction motor systems
Reversing
318480, H02P 142
Patent
active
041340493
ABSTRACT:
When a stacker motor slows down before stopping or reversing, it generates an error signal the polarity of which is detected by a sensing circuit which is optically coupled to a motor reversing circuit. If the detected error signal is positive, a first set of LED's in the sensing circuit are illuminated and trigger associated photo-sensitive transistors in the reversing circuit, which in turn energize selected pairs of back-to-back SCR's to connect the lines of a polyphase power source in a "forward" drive direction to the windings of the stacker motor in question, so that the motor is driven in a forward direction. When the error signal is negative, different LED's in the sensing circuit are illuminated and energize different transistors in the reversing circuit so that the motor is driven in the opposite or reverse direction. Inhibiting devices are employed in the reversing circuit to prevent undesirable shorting out of lines upon sudden motor reversal.
REFERENCES:
patent: 3181046 (1965-04-01), Sutton
patent: 3586020 (1968-11-01), Lisi
patent: 3593079 (1971-07-01), Plant
patent: 3678355 (1972-07-01), Bucek et al.
patent: 3921048 (1975-11-01), Padgitt
patent: 4034275 (1977-07-01), Mange
Hartman Metal Fabricators, Inc.
Rubinson Gene Z.
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