“…For this kind of applications, see DOB [5], [25], [28], [31], [95], SMDO [96], ESO [35], [89], [97], [98], GPIO [90], [91] and IDO [93], [94] applied to PMSM ( [5], [25], [28], [35], [96]), IM ( [89]- [91], [93], [94]), BLDCM ( [95], [97]) and switching reluctance motor ( [98]) to name but just a few.…”