Enabling Variable Phase-Pole Drives With the Harmonic Plane Decomposition

Abstract

Magnet-free acrlongpl vppm are competitive alternatives in electric vehicles where torque-speed operating region, reliability, cost, and energy efficiency are key metrics. However, their modeling and control have so far relied on existing fixed-phase and pole-symmetrical models, limiting their drive capabilities, especially when switching the number of poles on the fly. This paper establishes the acrlong hpd theory as a space- acrlong dft interpretation of the Clarke transformation, decomposing all pole-pair fields into a fixed number of orthogonal subspaces with invariant parameters. The model remains unaltered for all phase-pole configurations, guaranteeing continuity even under phase-pole transitions. Relations of the state and input space vectors, and model parameters to those of the acrlong vsd theory used for multiphase machines are established via the use of the complex winding factor. Experiments confirm the modeling theory and demonstrate its practical usefulness by performing a field-oriented-controlled phase-pole transition. Non-trivial configurations with more than one slot/pole/phase and a fractional phase number are also demonstrated.

Keywords

• Discrete Fourier transform
• harmonic plane decomposition
• multiphase electric machines
• variable phase-pole machine
• vector space decomposition