A study on a method solving optimal currents of IPMSM based on the PDS for electric vehicles

This paper proposes a method based on a projected dynamic system solving optimal currents, which ensure the minimal operation loss of the motor, of control system for interior permanent magnet synchronous motor (IPMSM) for electric vehicle. First, the efficiency optimization of IPMSM is modeled as a nonlinear programmming problem with constraints. Then using variational theory and projected dynamic theory to transform the model into projected dynamical equations, which is easy to implement with recurrent neural network. Last, the convergence criteria of projected dynamic equation and the identity of the solution of the programming problem are proved based on the Lyapunov theory and projection theory in this paper. The simulation analysis indicate that the method proposed in this paper is reasonable and the projected dynamical equation has a fast convergence speed.