Adaptive control of ac motor drives with inverter non-linearities

An ac motor drive consists of a dc-ac inverter, an ac motor and some mechan ical load. The inverter supplies electrical power in an appropriate form to the motor, which in turn provides the conversion to mechanical power neede d to drive the load. All three components of the system are characterized b y models which are non-linens and contain unknown parameters. Improved moti on control performance may thus be attempted by using non-linear adaptive c ontrol methods. In this paper, a linearizing adaptive motion controller is derived for a representative nc motor drive, under the assumption that the parameters describing the inverter, the motor, and its lend, are all unknow n. The controller guarantees global stability and asymptotic tracking.