Sliding Mode Observer for Wide Speed Range Sensorless Induction Machine Drives: Considerations for Digital Implementation

Author

Liu, Jingbo ; Hu, Jiangang ; Xu, Longya

Author_Institution

Dept. of Electr. & Comput. Eng., Ohio State Univ., Columbus, OH

fYear

2005

fDate

15-15 May 2005

Firstpage

300

Lastpage

307

Abstract

The paper discusses the issues and provides solutions to digital implementation of sliding mode observer (SMO), especially for sensorless controlled induction machine (IM) operating over a wide speed range. An adaptive low pass filter (LPF) is proposed with variable cut-off frequency for a wide speed range, including a programming technique of using over-sampling to increase the sampling rate seen by the SMO. The sampling rate is made much higher than the system PWM frequency. Methods of designing proper gain are given for a specific SMO. Simulation and experimental results based on the fixed-point DSP TMS320F2812 are provided to verify the effectiveness of the proposed methods

Keywords

adaptive filters; digital control; digital signal processing chips; induction motor drives; low-pass filters; machine control; matrix algebra; observers; power filters; sampling methods; variable structure systems; TMS320F2812; adaptive low pass filter; fixed-point DSP; over-sampling; programming technique; sensorless induction machine drives; sliding mode observer; variable cut-off frequency; Convergence; Cutoff frequency; Digital signal processing; Induction machines; Low pass filters; Mathematical model; Pulse width modulation; Sampling methods; Sensorless control; Sliding mode control;

fLanguage

English

Publisher

ieee

Conference_Titel

Electric Machines and Drives, 2005 IEEE International Conference on

Conference_Location

San Antonio, TX

Print_ISBN

0-7803-8987-5

Electronic_ISBN

0-7803-8988-3

Type

conf

DOI

10.1109/IEMDC.2005.195738

Filename

1531356