Estimation, Identification, and Sensorless Control in Motion Control System

Kouhei Ohnishi, Nobuyuki Matsui, Yoichi Hori

Research output: Contribution to journalArticlepeer-review

213 Citations (Scopus)


The paper presents the state of the art of motion system particularly emphasizing both estimation and identification of parameters and control variables of electric-motor-driven motion system. In modern electrical drive system, it is required to take not only electrical aspect but also mechanical phase into total system consideration. Improvement in electrical aspect needs a variety of information pertaining to electrical machines and power electronic circuits for improving ac variable-speed drives. Important techniques of identification or estimation of parameters and control variables in ac drives are explained. Such information includes machine parameters, flux, speed, position, and so on. Also, the paper shows that there is some theoretical limit of performance. For improvement of mechanical phase, the disturbance torque is the most important variable to be identified. It is used in motion control system, for example, in feedback loop. Various applications are possible by modification of such basic approach. As a conclusion, the paper shows that the total robustness is attained by integrating advances of control technique on the electrical aspect and the mechanical aspect. There are numerous variations of controller by possible combinations of these two aspects according to applications.

Original languageEnglish
Pages (from-to)1253-1265
Number of pages13
JournalProceedings of the IEEE
Issue number8
Publication statusPublished - 1994 Aug
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


Dive into the research topics of 'Estimation, Identification, and Sensorless Control in Motion Control System'. Together they form a unique fingerprint.

Cite this