| Abstract |
This paper presents a novel PMSM sensorless control scheme. The observed rotor position is
obtained from the active and reactive electromagnetic torque calculated in both the stationary á−â
and rotor d-q reference frame. This observed rotor position is improved by the addition of a term,
derived from the d-axis current controller voltage output, and used for the coordinate transformation.
The further compensation of the global time-delay, introduced by the voltage-, current-filters, and
inverter, has to be added to the estimated rotor position to calculate the current feedback signals and
obtain maximum torque/current control of the drive.
The original scheme guarantees a good field orientation even if parameter variations occur and/or
initial rotor position is not exactly known. |
