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RESISTANCE CORRECTED AND TIME DISCRETE CALCULATION OF ROTOR FLUX IN INDUCTION MOTORS
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| Author(s) |
G. Pfaff; H. Segerer; A. Lelkes |
| Abstract |
Mostly high dynamic control of induction motor depends on the knowledge of rotor flux. Usually the flux is calculated by machine models or by observers. Their digital realization in processors demands a time discrete equation system approximating the differential equations. A precise flux calculation usually requires a small sampling period, which is given by the processors performance. Respecting the time discrete character of the applied inverter, a longer sampling period is given by the switching frequency of the inverter. Since the sampling period is now longer than usually, also extensive calculations can be made on-line. The design principles and experimental results of a time discrete machine model respecting the time discrete character of a constant d.c. link voltage inverter are shown in this paper. The longer sampling period allows to correct on-line all model coefficients depending on resistances. For this, the stator temperature and the stator currents are measured. All applied equations are based on the dynamic behaviour of the induction motor . |
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| Filename: | Unnamed file |
| Filesize: | 559.5 KB |
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| Type |
Members Only |
| Date |
Last modified 2021-02-23 by System |
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