A sensorless adaptive non-linear control scheme for minimizing the stator energy losses of IPMSM

This study aims to investigate a direct torque and flux control scheme for an Interior Mounted Permanent Magnet Synchronous Motor (IPMSM) using an Adaptive Input-Output state Feedback-Linearization (AIOFL). In this control strategy, the rotor speed is evaluated basically by utilizing the momentary values of the enhanced electromagnetic torque and power. The generally stability of the drive system is demonstrated by Lyapunov hypothesis. For a given rotor reference speed and a rotor shaft load torque, the control strategy of Maximum Torque Per Ampere (MTPA) is performed by using a so-called stator flux search method. This search method is achieved by decreasing the magnitude of stator reference flux in small steps until the magnitude of stator current becomes minimum and as a result, the stator copper energy loss is minimized. The results of some computer simulations and tests, which have been came about, are displayed to demonstrate the viability and capability of the proposed control strategy.

Keywords:

Adaptive control , Input-output feedback linearization , IPMSM