Position sensorless control of switched reluctance motor based on a linear inductance model with variable coefficients. Issue 3 (13th August 2019)

• Record Type: Journal Article
• Authors: Xu, Aide; Chen, Jiagui; Ren, Ping; Zhu, Jingwei
• Is Part Of: IET energy systems integration. Volume 1:Issue 3(2019)
• Page Start: 210
• Page End: 217
• Publication Date: 2019-08-13
• Subjects: sensorless machine control -- machine control -- inductance -- reluctance motor drives -- rotors -- position control -- permanent magnet motors -- reluctance motors; magnetic saturation -- switched reluctance motor -- inaccurate position estimation -- position sensorless control -- estimation accuracy -- saturation inductance -- variable coefficient -- linear inductance model -- estimation error -- linear fitting -- rotor position -- mathematical model -- inductance curve -- linearity -- position estimation method; Power resources -- Periodicals; Energy conservation -- Periodicals; Power resources; Energy conservation; Periodicals; 333.79
• DOI: 10.1049/iet-esi.2019.0041
• Languages: English
• ISSNs: 2516-8401

Abstract

Abstract : To solve the problem of inaccurate position estimation due to the influence of magnetic saturation in sensorless control of switched reluctance motor (SRM), a new position estimation method is proposed. By analysing the linearity of the inductance curve, the region with better linearity can be found. Then, in this region, the mathematical model between rotor position and inductance can be built to estimate the rotor position by the linear fitting. However, the inductance curve will shift due to the influence of magnetic saturation in the case of heavy load, which makes the estimation error larger. Therefore, this study carries out a linear fitting of this region under different loads and establishes a linear inductance model with variable coefficient. This method can effectively eliminate the influence of saturation inductance on position estimation and have better estimation accuracy. Simulation and experimental results show the effectiveness and correctness of the proposed method.