| Title |
Speed Estimation of Induction Motor in Steady State Using the RSH |
| Authors |
양철오(Yang, Chul-Oh) ; 박규남(Park, Kyu-Nam) ; 송명현(Song, Myung-Hyun) |
| DOI |
https://doi.org/10.5370/KIEE.2011.60.9.1783 |
| Keywords |
RSH(Rotor Slot Harmonics) ; Sensorless estimation ; Induction motor ; Rotating speed |
| Abstract |
The slip frequency is included in feature frequency for fault diagnosis of rotor bar, so rotating rotor speed is needed. In this study, rotor slot harmonic(RSH) method is suggested for speed estimation of induction motor. When the rotor is rotating, motor current signal include the harmonic signal of back-emf voltage related with number of rotor slot. So from the power spectrum of current signal, the rotor speed can be founded. This method of rotor speed estimation gives the slip frequency, and the feature frequency of rotor bar fault can be calculated. Comparing with stroboscope speed meter, the error rate of suggested method is less than 0.1[%]. |