A design method of full-order flux observer for realization of both MTPA control and position sensorless control of IPMSM

A flux model, which is capable of both MTPA (Maximum Torque Per Ampere) control and position sensorless control of IPMSMs (Interior Permanent Magnet Synchronous Motors), has been proposed. This paper proposes that the flux is estimated using the full-order observer. And a design method for the full-order observer is also proposed. The design method of the full-order observer that robust flux estimation become possible against the velocity estimation error, by solving γ-positive real problem and H∞ control problem. In this paper, the experimental result of the position sensorless control of IPMSMs shows that a proposed design method of the full-order observer is very useful.