Field-weakening strategy in condition of DC-link voltage variation using on electric vehicle of IPMSM

This paper proposes the field weakening method of IPMSM(Interior Permanent Magnet Synchronous Machine) for the electric vehicle (EV) application. The method of using lookup-table generally used in automotive application has merits for fast dynamics, however containable data is limited especially on DC-link voltage. On the other hands, the method using a voltage feedback control has advantages in current control at variable speed and DC-link voltage automatically. However, dynamics is determined by the gain of controller. In this paper, field weakening control of fast dynamics and variable DC-link voltage is achieved by suitable combination of lookup-table and voltage feedback controller. Proposed method is verified by the simulation and experiment result.