Design of the Voltage Feedback Flux Weakening Controller for PMSM Based on Small Signal Voltage Model

초록

This implementation of a flux weakening (FW) controller is essential for achieving high speed operation in permanent magnet synchronous motors (PMSMs). In voltage feedback based FW control, the output voltage of the current controller is compared with the voltage limit to generate the d-axis current reference. However, due to the nonlinear relationship between the d-axis current and the output voltage magnitude, selecting proper control gains is challenging. Furthermore, the voltage model does not adequately reflect the actual motor model. To address these issues, this paper proposes an FW controller based on a small signal voltage model of the motor. The proposed controller uses only an integral controller, enabling simple implementation and straightforward gain tuning. Experimental results verify that the transient response characteristics depend on the designed control bandwidth, thereby confirming the validity and practical effectiveness of the proposed design method.

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