Decoupling Control Method in an M - and T-axis Current Vector Control System of a Permanent Magnet Synchronous Motor

Abstract

In general, the $\boldsymbol{ d-q}$ reference frame, which rotates synchronously with the rotor, is used to control permanent magnet synchronous motors (PMSMs). However, the M-T reference frame, which is synchronized with the stator flux-linkage vector, can also be used to control a motor, including PMSMs. For control on the M-T reference frame, it is expected that fewer motor constants will be required and a more concise control method can be constructed. However, it is difficult to obtain a good current response characteristic since there is mutual interference in the control system between the M- and T-axes. Therefore, this paper proposes a PMSM drive system based on the M- and T-axis current control that can improve the current control characteristics by compensating the reference voltage for suppression of the mutual interference. A simulation system for current vector control on the M-T frame is constructed on MATLAB/Simulink with the goal of evaluating the current response characteristics. In order to demonstrate the effectiveness of the proposed system, an experiment using an actual machine is also described.