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Resonance Suppression using Sensorless Control of Dual SPMSMs Fed by Single Inverter

  • Eom, Jae-Boo (Dep. of Electrical Engineering, Kyungpook National University) ;
  • Choi, Jong-Woo (Dep. of Electrical Engineering, Kyungpook National University)
  • Received : 2018.04.30
  • Accepted : 2018.08.09
  • Published : 2018.11.01

Abstract

To reduce the size and cost of motor driving systems, several methods for driving multiple parallel-connected motors with a single inverter have been proposed. However, dual PMSMs driven by a single inverter, unlike induction motors, have a problem with instability due to system resonance caused by disturbances such as load imbalance and tolerances between two motors. To drive dual SPMSMs fed by a single inverter, this paper proposes an active damping algorithm to effectively suppress resonance by using one-sided sensorless speed control and position difference estimation. By deriving rotor position difference from d-q current differences between two motors, the proposed method is affected less by position difference estimation errors and is simpler than dual sensorless position estimation.

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