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ROTOR TIME CONSTANT IDENTIFICATION IN SENSORLESS VECTOR CONTROL DRIVES USING ROTOR SLOT HARMONICS
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| Author(s) |
R. Blasco-Gimenez; G. M. Asher; M. Sumner |
| Abstract |
This paper describes the methodologies by which real time speed measurement obtained from the spectral estimation of rotor slot harmonics present in the stator currents of a cage induction machine are employed to identify the value of the rotor time constant. An alldigital method, based on the Fast Fourier Transform (FFT), is employed to obtain a real-time
speed measurement with very high accuracy and robustness. This speed measurement is then used to tune a model-reference closed-loop flux and speed estimator against rotor time constant variation. Although the accuracy of the rotor time constant estimate is dependant on the accuracy of the rest of the machine parameters, the speed estimate from the model-reference speed estimator follows the actual speed of the machine very accurately. The speed holding capability of the resulting sensorless vector control drive is therefore increased. |
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| Filename: | Unnamed file |
| Filesize: | 436.6 KB |
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| Type |
Members Only |
| Date |
Last modified 2017-11-06 by System |
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