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Low-frequency signal-demodulation-based sensorless technique for induction motor drives at low speed

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6 Author(s)
Consoli, A. ; Dept. of Electr., Univ. of Catania, Italy ; Scarcella, G. ; Bottiglieri, G. ; Scelba, G.
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The paper presents a method to compute the air-gap flux position in induction motors at very low including zero-stator frequency. A low-frequency (50 ÷ 100 Hz) sinusoidal stationary signal is added to the normal stator variables to provide the machine with a suitable permanent excitation. Such an additional excitation modulates the saturation level of the magnetic core of the machine according to the angular position of the air-gap flux. As a result, a new zero-sequence stator-voltage component is generated that contains useful information about the position of the air-gap flux unaffected by load variation. Such a zero-sequence voltage can be easily employed to provide a wide bandwidth measurement of the air-gap flux position. A key feature of the proposed approach is that a low-frequency (0 ÷ 5 Hz) signal is demodulated, thus avoiding any drawback featured by previous sensorless techniques operating with high-frequency signal injection.

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Industrial Electronics, IEEE Transactions on  (Volume:53 ,  Issue: 1 )