Real time operating system based online rotor position error minimization technique (RPEM) for permanent magnet synchronous machines

A online rotor position error minimization technique for Hall sensor based permanent magnet synchronous machine has been presented in this paper. Generally the Hall sensor and rotor magnets are not perfectly synchronised, which leads to a phase difference in actual rotor position and Hall sensor output. This phase shift leads to increase in d-axis current and total machine current, which may affect the closed loop speed or torque control of machine. Simulation studies have been carried out in Matlab Simulink platform and hardware implementation has been done with Opel-RT based real-time system. Both the simulation and hardware results show satisfactory performance of the proposed system.