Four-dimension current vector control for dual three-phase PMSM

There is only current closed loop control in the α-β subspace which is related to electromechanical energy conversion in the two-dimension current control for dual three-phase PMSM, due to the effect of voltage source inverter (VSI) dead-time and the other nonlinear factors, the phase voltage contain lower order harmonics, the harmonic impedance in the z1-z2 subspace is only comprised of the stator resistance and leakage inductance, low level harmonic voltage can induce very high harmonic currents. The harmonic currents can be suppressed by the proposed four-dimension current vector control scheme in this paper. The three-phase decomposition SVPWM is improved for four-dimension current vector control. The voltage modulation range of four-dimensional current vector control is analyzed. The effectiveness and validity of the proposed scheme are confirmed by the experiment results.