Salvatore L., Cupertino F., Cascella G.L.
 

This paper appears in: Industrial Electronics, 2002. ISIE 2002. Proceedings of the 2002 IEEE International Symposium on
Issue Date: 2002
Volume: 2
On page(s): 489 - 494 vol.2
Print ISBN: 0-7803-7369-3
INSPEC Accession Number: 7480376
Digital Object Identifier: 10.1109/ISIE.2002.1026338
Date of Current Version: 07 November 2002

ABSTRACT

This paper presents a new approach to the sensorless vector control of a surface permanent magnet synchronous motor (SPMSM). It shows that the time-delay, in electrical rotor position estimation, does not influence the vector control when the d- and q-axis current components are accurately estimated. The PI controllers, fed by the actual d-and q-axis current errors, generate the correct voltage references in the estimated rotor reference frame. As a consequence, the coordinate transformation needs the estimated rotor position with no correction. To obtain accurate estimates of the d- and q-axis current components, it is sufficient that the estimated EMF and current space vectors have the same delay as to the actual ones. An adaptive sliding-mode observer, with chattering-noise low-pass filter, is used to estimate the EMF space vector, and a similar low-pass filter to delay the current space vector. The rotor speed and position are obtained from the estimated EMF space vector and its derivative. Simulation results are presented to prove the effectiveness of the new approach to sensorless vector control.