Current harmonic elimination method for asymmetric dual three-phase permanent magnet synchronous motor

Four-dimension current control for asymmetric dual three-phase permanent magnet synchronous motor based on vector space decomposition approach can eliminate the harmonic currents induced by the nonlinear characteristics of inverter. This study proposes a control strategy which uses a combination of the dead-time compensation scheme and current harmonic elimination algorithm together to eliminate the harmonic currents. The dead-time compensation is calculated based on the analysis of the non-linear characteristics of the inverter. Besides, a resonant controller which takes into account the pole correction caused by the discretisation process is employed in harmonic subspace as the feedback current control loop to generate the compensation voltage. In addition the phase lag caused by the pulse width modulation update and inductive load is also considered to ensure the stability of resonant controller. The experimental results demonstrate the superior performance of the proposed scheme.