Sliding Mode Observer based Rotor Position Estimation with Field Oriented Control of PMBLDC Motor Drive

A sensorless field-oriented control of PMBLDCM based on sliding mode observer is presented. FOC is a technique for regulating torque in variable frequency drive. A modified sliding-mode observer has been designed for field-oriented control of PMBLDCM powered by a voltage-source inverter in order to accomplish speed control of drives. The disturbances have been estimated taking the load torque and viscous friction coefficient into account. This article demonstrates the PMBLDCM drive sensorless FOC in two-phase operating mode to achieve torque control. Provided with the proposed algorithms, such observer is beneficial in reducing the rotor position estimation error for variable speed drives. The implemented sensorless control algorithms are implemented and evaluated in a hardware prototype. The simulation and experimental findings are presented to demonstrate the efficacy of the strategy developed.