Servo Drive Comparison in a Hoist Application
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The performances of an electric servo drive system and a frequency converter drive system designed for crane applications are compared. The comparison is based on testing of both systems according to specific requirements. Both drives utilize closed loop vector control. To make the tests as comparable as possible both drive utilize the same motor connected to a variable speed electrical chain hoist. The tests comprise zero speed test, field weakening test, positioning accuracy and smoothness tests. The servo drive system satisfied all requirements set. The frequency converter, however, was not able to provide such a high positioning accuracy and nice dynamics as the servo drive system. Theoretical evaluations were all verified by real measurements.
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