Sensorless Control of PMSM Based on Fractional Order Synergetic Control

In this article is presented a sensorless control structure of the speed of a Permanent Magnet Synchronous Motor (PMSM) rotor based on the classic Field Oriented Control (FOC) strategy, where the PI outer speed loop controller in the classical approach supplies the current reference i
_qref
for a Synergetic controller, which supplies the output controls u
_d
and u
_q
for the PMSM control. The synergetic control is considered as a generalization for the Sliding Mode Control (SMC). Among the remarkable properties of this type of design of control are the decoupling procedure and a reduced order model for the controller. The PMSM operating equations, fractional order calculus elements and a Sliding Mode Observer (SMO) type speed observer of are presented herein. By replacing the Synergetic current controller with a Fractional Order (FO) Synergetic current controllers, superior performance is achieved due to the use of the fractional calculus.