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JEET, Vol. 13, No. 6, November 2018
Resonance Suppression using Sensorless Control of Dual SPMSMs Fed by Single Inverter
Jong-Woo Choi
Area B - Electric Machinery and Power Electronics
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.
Keyword Dual SPMSMs,SIDM,Active damping control,Sensorless speed control.
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