A multiphase induction machine model using vector space decomposition provides insights into many space harmonics through decoupled reference frames. These decoupled reference frames host specific space vectors related to particular space harmonics. Based on the physical winding configuration, these vector spaces can be excited independently or simultaneously for the production of torque. Each torque-producing vector space generates a unique number of magnetic pole pairs and has independent torque-slip characteristics. In most literature, the transition between these magnetic pole pairs is achieved by magnetizing a desired vector space and then performing the torque transition. This approach results in beat oscillations due to interference between magnetized vector spaces. This paper proposes a solution that eliminates these beat oscillations during magnetic pole-pair transition while optimizing the stator current peaks. The effectiveness of this synchronized phase-pole modulation solution is experimentally verified on a 9-phase induction machine in comparison to the standard magnetic pole-pair transition methods.
QC 20241121