Sensorless speed control of permanent-magnet motors with nonsinusoidal EMF waveform

C. DE ANGELO; G. BOSSIO; J. SOLSONA; G. GARCÍA; M. I. VALLA

IEE PROCEEDINGS ON ELETRIC POWER APPLICATIONS

IET (former IEE)

Año: 2005 vol. 152 p. 1119 - 1126

1350-2352

A novel sensorless speed-control strategy for permanent-magnet AC motors (PMACMs)is presented. A nonlinear reduced-order observer and a high-gain observer are designed to estimatethe induced EMF, without mechanical position or speed sensors. In contrast with previousproposals, the EMF estimation is performed without previous knowledge of its waveform. Fromthe estimated EMF, the rotor speed and the position derivatives of  flux are calculated and used forthe implementation of a PMACM speed control without mechanical position sensor. The proposedstrategy is not limited to PMACM with sinusoidal or trapezoidal EMF waveform. Moreover, itallows the PMACM ripple torque and copper losses to be minimised. The performance of theproposal is validated through simulation and experimental results.