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Speed Sensorless Control of Induction Motors at Very Low Stator Frequencies
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| Author(s) |
M. Depenbrock; C. Foerth; S. Koch |
| Abstract |
This paper presents an advantageous way for calculating the stator resistance of an induction machine
on-line because speed estimation of an induction machine at very low stator frequencies under linear
conditions is only possible if the stator resistance is known. The stator resistance of machines is
strongly dependent on the stator temperature. Speed estimation at very low stator frequencies is possible
but at stator frequency equal to zero and a small region around zero in practice speed estimation
fails under linear conditions due to physics. A scheme is presented to avoid these stator frequencies
stationarily by varying the modulus of the stator flux space vector and the slip frequency. With these
two improvements speed estimation never fails in any working point. Experimental results of a
120 kW traction drive are shown. |
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| Filename: | EPE1999 - PP00056 - Depenbrock.pdf |
| Filesize: | 940.5 KB |
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| Type |
Members Only |
| Date |
Last modified 2004-03-30 by System |
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