The direct-on-line starting of induction motors produces troublesome torque and current transients. Soft starters enable a reduction of the motor sizing and more reliable operation; among different soft-starting control strategies, the closed-loop current control seems the most effective. This work proposes a novel sensorless current limitation for a soft-starter, in which the currents are estimated using only measurements of the thyristor conducting angles.
Sensorless Current Control of a Soft-Starter for Induction Motors
BOLOGNANI, SILVERIO;ZIGLIOTTO, MAURO;
1996
Abstract
The direct-on-line starting of induction motors produces troublesome torque and current transients. Soft starters enable a reduction of the motor sizing and more reliable operation; among different soft-starting control strategies, the closed-loop current control seems the most effective. This work proposes a novel sensorless current limitation for a soft-starter, in which the currents are estimated using only measurements of the thyristor conducting angles.
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