In this paper, a new sensorless detection scheme for PMSM is presented. This detection scheme consits of PMSM's mathematical model and the flux-linkage observer. The mathematical model is used to approximate the nonlinear system of PMSM. Due to the current modification scheme with errorcorrection fashion, as detailed in this paper, the actual rotor position and the machine speed can be estimated even in the transient state, and the sensorless drive system has a good robustness to the motor parameter's variation. The proposed detection scheme is not only to reduce the speed estimate error largely, but also to stabilize the PMSM system.The high performance of the proposed sensorless algorithm is verified by the simulation results of PMSM .
The complete high-order perturbation formulas are established by both crystal-field (CF) and charge-transfer (CT) mechanisms. The EPR g factors of MgTiO 3: Cr 3+, SrTiO 3: Cr 3+ and SrTiO 3: Mn 4+ crystals are calculated from the formulas. The calculations of the EPR g factors are in agreement with the experimental values. The contribution rate of the CT mechanism (|ΔgT/ΔgF|) to EPR parameters, increases with the growth of the valence state for the 3dn ions in the crystals. For the higher valence state 3d3 ion Mn 4+ in crystals, the explanation of the EPR parameters reasonably involves both CF and CT mechanisms. The g values are also given from one-spin-orbit-parameter model and crystal-field (CF) mechanism for comparison.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.