Linear parameter varying approach to robust control of a permanent magnet synchronous motor

This paper deals with robust control of linear parameter varying (LPV) system (synchronous motor) by a LPV controller. State space equations of asynchronous motor in d-q rotating frame are nonlinear with respect to rotor speed. Nonlinear equations are rewritten to parameter form describing dependency on rotor speed which is assumed to be known by measurement or by estimation. LPV controller is designed using H_∞ theory to govern stator currents of synchronous motor. Simulation results presented in this paper show that current controller provides good current tracking over whole range of rotor speeds.