Offline Compensation Method for Current Scaling Gains in AC Motor Drive Systems with Three-Phase Current Sensors

Min Sik Yoo, Sang Woo Park, Hyun Jun Lee, Young Doo Yoon

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


This article proposes an offline compensation method for current scaling gains in the AC motor drive systems with three-phase current sensors. Many articles have been presented about the current scaling gain compensations of inverters. Most of them can be adopted during rotations. Those were studied for two-phase current sensing. Applications, such as elevators and hoist cranes, generally measure three-phase currents directly using three current sensors in preparation for a fault in any one of them. In this article, we present a compensation method for a three-phase current sensing system. This article analyzes the effect of current scaling gain errors on the neutral current that is calculated with measured stator currents. Based on the analysis, a compensation strategy for the current scaling gains is presented. The proposed method is applicable only at a standstill. It can be used for initial commissioning since it works at a standstill regardless of whether the rotor is locked or not. The experiments that demonstrate the validity of the proposed method were carried out in an elevator system as well as a laboratory. The proposed method is simple to be implemented and it requires no additional hardware.

Original languageEnglish
Article number9082188
Pages (from-to)4760-4768
Number of pages9
JournalIEEE Transactions on Industrial Electronics
Issue number6
StatePublished - 2021 Jun


  • Current measurement error
  • current-sensor-induced torque ripple
  • offline compensation
  • three-phase current sensing


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