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Test Signal based Speed Estimation for Induction Motor Drives
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| Author(s) |
Heiko Zatocil; Bernhard Piepenbreier |
| Abstract |
In the first part of the paper an estimation method for sensorless control employing a test signal based reference model is presented. The method estimates the slip frequency by a comparison of the measured test signal impedance curves while the machine is in operation with curves from a test signal based reference model. The reference model which describes the test signal behaviour of the machine is measured during DC magnetisation of a cold machine at steady state and constant rotor flux linkage. During normal machine operation the machine temperature and the stator frequency
differ from these conditions and, thus, have a negative influence on quality of the estimation. In the second part
of the paper the impact of these disturbances is investigated and two compensation strategies are presented.
Measurements on two different standard induction machines which are not especially designed for sensorless control show that the estimation method allows safe operation at standstill and even at zero frequency. |
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| Filename: | Unnamed file |
| Filesize: | 2.157 MB |
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| Type |
Members Only |
| Date |
Last modified 2010-11-16 by System |
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