TY - GEN
T1 - Modelling the impact of the stator currents on inductance-based sensorless control of brushless DC-machines
AU - Gabriel, Fabien
AU - De Belie, Frederik
AU - Sergeant, Peter
AU - Neyt, Xavier
PY - 2011
Y1 - 2011
N2 - Inductance-based sensorless control methods allow to estimate the rotor position by tracking the magnetic anisotropy linked to the rotor, partly caused by the magnetic saturation of the iron. In most salient-pole machines, the magnetic field in the air-gap may be approached by a sinusoidal function along the air-gap. Furthermore, the stator self-inductance mainly varies with two times the electrical rotor angle. In brushless DC-machines however, inductance-based estimations are affected by an important harmonic content in the magnetic field. Besides, it is well-known that large stator currents cause position estimation errors due to a variable magnetic state. This paper proposes a simple analytical model to take into account the combined effects of the stator currents and the harmonics. The goal is to understand these effects on the position estimation through simulations. The model is specifically developed for surface-mounted permanent-magnet brushless DC-machines with diametric single-slot-pair windings. The results suggest that the combined effects could be used to compensate for the position estimation error.
AB - Inductance-based sensorless control methods allow to estimate the rotor position by tracking the magnetic anisotropy linked to the rotor, partly caused by the magnetic saturation of the iron. In most salient-pole machines, the magnetic field in the air-gap may be approached by a sinusoidal function along the air-gap. Furthermore, the stator self-inductance mainly varies with two times the electrical rotor angle. In brushless DC-machines however, inductance-based estimations are affected by an important harmonic content in the magnetic field. Besides, it is well-known that large stator currents cause position estimation errors due to a variable magnetic state. This paper proposes a simple analytical model to take into account the combined effects of the stator currents and the harmonics. The goal is to understand these effects on the position estimation through simulations. The model is specifically developed for surface-mounted permanent-magnet brushless DC-machines with diametric single-slot-pair windings. The results suggest that the combined effects could be used to compensate for the position estimation error.
UR - http://www.scopus.com/inward/record.url?scp=80755176669&partnerID=8YFLogxK
U2 - 10.1109/SLED.2011.6051545
DO - 10.1109/SLED.2011.6051545
M3 - Conference contribution
AN - SCOPUS:80755176669
SN - 9781457718540
T3 - SLED 2011 - 2nd 2011 Symposium on Sensorless Control for Electrical Drives
SP - 56
EP - 63
BT - SLED 2011 - 2nd 2011 Symposium on Sensorless Control for Electrical Drives
T2 - 2nd IEEE International Symposium on Sensorless Control for Electrical Drives, SLED 2011
Y2 - 1 September 2011 through 2 September 2011
ER -