From characterisation to optimal flux-weakening control of Permanent Magnet Synchronous Motors (PMSMs)

The flux weakening has become essential in Permanent Magnet Synchronous Motors (PMSMs) control to expand the speed range. So many works had been made in this topic last years, but, they are rare studies that take into account the magnetic saturation, and talk about optimization of flux weakening space. In this paper, an optimal flux weakening control scheme has been developed. The magnetic saturation is also considered. This method is based on two steps. The first one presents a specific identification scheme of PMSM. Second one shows how to build lookup tables for flux weakening control by using an optimization algorithm under constraints, based on obtained identification results. An example of illustration is discussed at each step of this study.