Static controlled AC motor drive having plug reversal capability

Details Static controlled AC motor drive having plug reversal capability Static controlled AC motor drive having plug reversal capability

1977-09-30

1979-06-26

Shoop, William M.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 71, H02M 112

Patent

active

041595130

ABSTRACT:
Plug reversal of an induction motor supplied by an N-stage inverter system operating under harmonic neutralization technique is provided by reversing the polarity of the square-shaped voltages combined at .pi./N from each other and by reversing at the same time the sequence of the stages as well as the logic of dissection of the reference time wave. A mirror image of the time scale is effected at the instant of reversal. Digital means are used. Reversible ramp forming generators of the UP-DOWN type are associated in each stage with a phase shifter in order to create the mirror image of the logic controlling the inverter system. A reversible ring counter is used to reverse the sequence of the stages. A reversible pulse generator is used to accommodate an integer number of elementary time intervals in each ramp and between each ramp for the given number of stages.

REFERENCES:
patent: 3491282 (1970-01-01), Heinrich et al.
patent: 3950692 (1976-04-01), Smolnikov et al.
patent: 4017744 (1977-04-01), Johnson

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