Loss-minimizing control based on QP sequence of the IPMSM drive systems for electric vehicles

This paper proposes a method based on the quadratic programming (QP) sequence for solving loss-minimizing current, which yields minimum loss of motor, of control system for interior permanent magnet synchronous motor (IPMSM) of electric vehicle. First, the efficiency optimization of IPMSM is modeled as a constrained programming problem, and then transformed it into linear constraint QP sequence. The convergence of QP series solution and the identity of the solution of the primal programming problem are proved. By simulation analysis, it is very suitable for efficiency-optimizing control performed in numerical controller for IPMSM control systems because of the fast convergence, and a small calculation amount.