Improved orthogonal flux corrector-based rotor flux estimation in PMSM sensorless control
In a permanent magnet synchronous machine (PMSM) system, the voltage mode-based rotor flux observer suffers from DC drift, primarily due to measurement errors, parameter variations, and non-zero initial states. To address this issue, the second-order flux observer (SOFO) is utilized, equipped with f...
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| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/181498 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | In a permanent magnet synchronous machine (PMSM) system, the voltage mode-based rotor flux observer suffers from DC drift, primarily due to measurement errors, parameter variations, and non-zero initial states. To address this issue, the second-order flux observer (SOFO) is utilized, equipped with filtering capability aimed at reducing harmonic components. However, the DC offset induced by external disturbances cannot be completely eliminated by the second-order transfer function alone. Traditional magnetic flux correctors typically update correction values only at zero-crossing points of the magnetic flux. In this study, we propose an improved orthogonal flux corrector (IOFC) that combines a generalized integrator to effectively filter out the DC offset. In comparison with traditional OFC methods, our approach involves reconstructing two magnetic linkage functions, thereby doubling the correction frequency within a single cycle. Consequently, the frequency of correction term updates is threefold compared to conventional OFC methods. Finally, IOFC is implemented and tested on a PMSM platform for experimental verification. |
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