Decoupling control of current loop for permanent magnet synchronous motor drives using error compensation

In order to realize decoupling control of d-and q-axis terms in current control loops of permanent magnet synchronous motor (PMSM) drives, a polynomial decoupling structure based on current errors was proposed to compensate coupling terms. To obtain one-order delay current loop, the compensation was deduced from stator voltage equations on the basis of traditional feedback current controllers. Then the integral compensation was expended to a polynomial expression by Taylor method at zero point, to reduce saturation of voltage. Compared with the traditional feedback current control, the proposed method can reach more precious control of d-and q-axis currents, especially during the process of acceleration. Simulation and experimental results verify the feasibility of this method.