Mathematical Model of MTPA Control for M- and T-axis Current Control Systems in PMSM Drives

This paper proposes a relationship between the M- and T-axis currents for the maximum torque per ampere (MTPA) control of permanent magnet synchronous motors (PMSMs). This paper focuses on a rotating reference frame, which is synchronized with the stator flux-linkage vector. The validity of the proposed relationship is confirmed by using finite element analysis (FEA) and measured values of the tested motor. The control characteristics of the M- and T-axis current control system are also evaluated.