Current control method with control inputs in polar coordinates for SPMSM based on linearized model

SPMSMs (Surface Permanent Magnet Synchronous Motors) are employed for many industrial applications. For quick torque response under voltage limit, voltage phase control method had been proposed. However, it needs to switch the mode of controller. This paper proposes a flux-weakening control method for SPMSM using control inputs in polar coordinates to reduce the number of mode transition. This control method is designed with a precise plant model. In addition, the authors investigate controller design using control inputs in polar coordinates instead of d-axis and q-axis voltage within voltage limit.