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http://dx.doi.org/10.6113/TKPE.2022.27.1.33

Torque Ripple Reduction Method With Enhanced Efficiency of Multi-phase BLDC Motor Drive Systems Under Open Fault Conditions  

Kim, Tae-Yun (Dept. of Electrical Engineering, Smart Grid Research Center, Chonbuk National University)
Suh, Yong-Sug (Dept. of Electrical Engineering, Smart Grid Research Center, Chonbuk National University)
Park, Hyeon-Cheol (Dept. of Electrical Engineering, Smart Grid Research Center, Chonbuk National University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.27, no.1, 2022 , pp. 33-39 More about this Journal
Abstract
A multi-phase brushless direct current (BLDC) motor is widely used in large-capacity electric propulsion systems such as submarines and electric ships. In particular, in the field of military submarines, the polyphaser motor must suppress torque ripple in various failure situations to reduce noise and ensure stable operation for a long time. In this paper, we propose a polyphaser current control method that can improve efficiency and reduce torque ripple by minimizing the increase in stator winding loss at maximum output torque by controlling the phase angle and amplitude of the steady-state current during open circuit failure of the stator winding. The proposed control method controls the magnitude and phase angle of the healthy phase current, excluding the faulty phase, to compensate for the torque ripple that occurs in the case of a phase open failure of the motor. The magnitude and phase angle of the controlled steady-state current are calculated for each phase so that copper loss increase is minimized. The proposed control method was verified using hardware-in-the-loop simulation (HILS) of a 12-phase BLDC motor. HILS verification confirmed that the increase in the loss of the stator winding and the magnitude of the torque ripple decreased compared with the open phase fault of the motor.
Keywords
BLDC (BrushLess Direct Current) motor; FTC (Fault Tolerant Control); Efficiency; Multi-phase current control;
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