Sensorless Control of a Ferrite PM Assisted-Synchronous Reluctance Machines by Using Sliding Mode Observer and High Frequency Signal Injection

Zhiwei Zhang,Libing Zhou

doi:10.5755/j01.eie.22.4.15906

Abstract

This paper presents sensorless control of ferrite permanent magnet-assisted synchronous reluctance machines (FPMA-SynRM) over wide speed range by using sliding mode observer (SMO) and high frequency signal injection. The basic equation of sliding mode observer will be derived based on dynamic model of PMSynRM. In the study, the equivalent of EMF-based SMO is proposed to estimate rotor position at medium and high speed range. The principles of high frequency signal injection, digital signal processing and rotor polarity identification is also analysed. Finally, the theoretical analysis have been verified with the experiments and the results obtained show that the resolution of estimated position signal can meet requirements of some industrial drive applications.DOI: http://dx.doi.org/10.5755/j01.eie.22.4.15906

Highlights

The conventional rare-earth interior permanent magnet synchronous machine was popular in industrial drive applications, in electric vehicle traction systems, over several decades due to its high torque density, high efficiency, wide constant power range, etc
In order to enhance torque density of pure synchronous reluctance machines, the low cost ferrite permanent magnets can be inserted into rotor lamination to improve torque density and power factor
This paper presents sensorless control of ferrite permanent magnet-assisted synchronous reluctance machines over wide speed range by using sliding mode observer and high frequency signal injection

Summary

Introduction

The conventional rare-earth interior permanent magnet synchronous machine was popular in industrial drive applications, in electric vehicle traction systems, over several decades due to its high torque density, high efficiency, wide constant power range, etc. [1]. The conventional rare-earth interior permanent magnet synchronous machine was popular in industrial drive applications, in electric vehicle traction systems, over several decades due to its high torque density, high efficiency, wide constant power range, etc. The high cost, limited resources and unstable supply of rare-earth permanent magnet are challenging issues. The torque density and power factor of pure synchronous reluctance machines are relatively poor. In order to enhance torque density of pure synchronous reluctance machines, the low cost ferrite permanent magnets can be inserted into rotor lamination to improve torque density and power factor. Compared to conventional rare earth permanent magnet machines, the reluctance torque component is Manuscript received 21 December, 2015; accepted 24 May, 2016

Methods

Results

Conclusion