AC Motor drive system having clamped command error signal

Details AC Motor drive system having clamped command error signal AC Motor drive system having clamped command error signal

1979-04-24

1981-06-16

Witkowski, S. J.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318798, 318812, H02P 534, H02P 742, H02P 528, H02P 736

Patent

active

042740428

ABSTRACT:
Disclosed is a three phase AC motor drive system wherein a variable frequency variable magnitude AC current is fed to an AC motor load from a thyristor controlled DC to AC inverter which is supplied from a thyristor controlled AC to DC converter by way of a DC link including an inductor. The DC load current is commanded to rise at a rate limited by the difference between the output voltage of the converter and the input voltage to the inverter which voltage appears across the inductor. As a result of the inherent commutation transport lag encountered for commands in the negative direction, an error signal clamp is placed in a feedback signal path controlling the AC to DC converter for limiting the command for changes in the positive direction thereby providing a system response in the positive direction which is more nearly like the response in the negative direction.

REFERENCES:
patent: 3805135 (1974-04-01), Blaschke
patent: 3919609 (1975-11-01), Klautschek et al.
patent: 4137489 (1979-01-01), Lipo
patent: 4186334 (1980-01-01), Hirata

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