Combined Back-EMF Estimator with High-Frequency Signal Injection for Wide Speed Range Sensorless Control of PMLSM

Hua Cai Lu; Xuan Yu Yao; Juan Ti

doi:10.4028/www.scientific.net/AMR.753-755.1405

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 753-755Combined Back-EMF Estimator with High-Frequency...

Combined Back-EMF Estimator with High-Frequency Signal Injection for Wide Speed Range Sensorless Control of PMLSM

Abstract:

This paper describes a composite sensorless position and speed detection algorithm designed for permanent magnet linear synchronous motor (PMLSM). A high-frequency voltage signal injection method is used at starting and low speed, and a back-EMF integrate method is used at high speed, and the two kinds of method are fused by weighting method in the transition speed area. Simulation results show that estimation accuracy of this composite estimation method is satisfactory, and the sensorless control system based on this method has good dynamic response characteristics within full speed.