| Title |
Sensorless Speed Estimate Method Using Discrete Flux Observer for Induction Motor V/f Control |
| Authors |
오귀운(Gwi-Un Oh) ; 홍창완(Chang-Wan Hong) ; 고종선(Jong-Sun Ko) |
| DOI |
https://doi.org/10.5370/KIEE.2025.74.9.1566 |
| Keywords |
Discrete Flux Observer; Induction Motor; Speed Estimator; Sensorless; V/f Control |
| Abstract |
This paper presents a rotor speed estimation method for sensorless control of induction motors, based on a discrete-time flux observer. Although V/f control offers simplicity and ease of implementation, it is typically configured as an open-loop system, which limits its accuracy under varying load conditions. To address this issue, this study proposes a real-time rotor speed estimation approach by calculating slip using flux information, thereby laying the foundation for future extension to closed-loop control. The proposed method estimates the slip frequency from the observed stator flux, and consequently determines the rotor speed. The effectiveness of the proposed approach is validated through MATLAB/Simulink-based simulations under various load conditions and experimental results using a 5.5 kW M-G(Motor-Generator) set. |