Sensorless torque control of SyncRel motor drives

This paper describes a direct self-control (DSC) scheme for synchronous rel uctance motor drives. The presented DSC scheme develops a new torque contro l methodology that does not require any position transducer to synchronize the stator current vector with the rotor. Such a control strategy differs f rom the conventional DSC approach in order to fit some specific requirement s of synchronous reluctance (SyncRel) machines. First, torque and rotor pos ition are controlled instead of torque and stator flux as in a conventional DSC scheme, Second, the operating sector is selected according to the actu al position of the current vector rather than the position of the stator fl ux, The proposed methodology allows simplifying implementation of the torqu e control on SyncRel drives and reducing the global cost for medium-perform ance electric drives. Simulations and experimental tests on a 1.5-kW motor drive are provided to evaluate the consistency and the performance of the p roposed control technique.