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

H - Electricity

02

M

323/10, 318/108,

H02M 5/257 (2006.01) H02P 13/18 (1980.01)

Patent

CA 1153063

21 DSH 2521 AC MOTOR DRIVE SYSTEM HAVING CLAMPED COMMAND ERROR SIGNAL ABSTRACT OF THE DISCLOSURE 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 thruster 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.

359260

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