Abstract
A wide range of industrial and civil applications used Interior permanent magnet synchronous motors (IPMSMs) due to its high reliability, low maintenance costs, high power density, and cheaper of permanent magnet costs. The flux-weakening control method is applied to enlarge the speed range of IPMSMs. The traditional flux-weakening control strategy degrades the control performance in a deep flux-weakening region due to the disturbance of the q-axis current. A new optimal operating area is proposed. This operating region combines the maximum torque per ampere (MTPA) curve, current limit circle, and maximum torque per volt (MTPV) curve. Based on the maximum torque per volt (MTPV) curve, the d-axis current is limited by MPTV in the deep flux-weakening area; instead, the current limit circle leads to improve the stability of the q-axis control current. The current controller is designed to decouple the d–q axis current lead to the robust coupling of the PMSM. Simulation results show the stability and effectiveness of the strategy.
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