explained. The method doesn't include any modification to the classical construction of such
motors and can be easily integrated within the drive electronics. It is applicable to both motor
types, i.e. those with sinusoidal or trapezoidal back EMF. The method is independent of excitation
current profile. It is also vimally independent of system parameters. The back EMF waveform is
extracted on-line using simple and integration-free algebraic expression through a novel
measurement setup. It is then used within the corrective phase of an extended Kalman filter (EKF)
to enable accurate estimation of the rotor position and speed. The method functionality is tested by
simulation for sinusoidal back EMF motor with sinusoidal and quasi-square excitation as
representative cases. Simulation results show a good performance at very low speeds.