Inductances and back-emf harmonics influence on the Torque/Speed characteristic of five-phase SPM machine

Franck Scuiller (1) , Eric Semail (2)

1 IRENAV - Institut de Recherche de l'Ecole Navale
2 L2EP - Laboratoire d’Électrotechnique et d’Électronique de Puissance - ULR 2697

In this paper, the study of torque/speed characteristic for five-phase Surface-mounted Permanent Magnet (SPM) machine is carried out. With considering several hypothesis (linear magnetic modelling, only first and third harmonic terms in the back-emf and current spectrums), an optimization problem that aims to maximize the torque for given maximum voltage and RMS current is formulated: the optimal torque sharing among the two virtual machines (the two dq-axis subspaces) that represent the real five-phase machine is thus calculated for any mechanical speed. For an inverter and a DC voltage sized with only considering the first harmonic of back-emf and current, the problem is solved with changing the ratio between the two virtual machine back-emfs and changing the ratio between the two virtual machine inductances. The results are examined by introducing particular speed points.

Mots clés: Multi-phase machine; Flux weakening; Electrical machine speed range

Domaines: Energie électrique

Franck Scuiller, Eric Semail. Inductances and back-emf harmonics influence on the Torque/Speed characteristic of five-phase SPM machine. Vehicle Power and Propulsion Conference (VPPC), Oct 2014, Coimbra, Portugal. pp.1-6, ⟨10.1109/VPPC.2014.7007088⟩. ⟨hal-01208377⟩