Journal
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
Volume 7, Issue 1, Pages 104-113Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTE.2020.2991271
Keywords
Voltage control; Radio frequency; Voltage measurement; Resistance; Permanent magnet motors; Synchronous motors; Stators; Fault diagnosis; interturn short-circuit fault (ISCF); permanent magnet synchronous machine (PMSM); PWM control voltage extraction; zero-sequence voltage vector decomposition
Funding
- National Natural Science Foundation of China [51877098, 51991383]
- Key Research and Development Program of Jiangsu Province [BE2018107]
- Natural Science Research of Jiangsu Higher Education Institutions of China [18KJB510008]
- Priority Academic Program Development of Jiangsu Higher Education Institutions [PAPD201887]
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The article introduces a new method for diagnosing ISCF in low-speed PMSMs, which improves fault phase identification sensitivity by decomposing zero-sequence voltage vectors and extracting the voltage vector closest to the ISCF phase angle. Additionally, a method for extracting phase voltage from PWM duty-cycle control voltage is proposed to reduce errors caused by measuring zero-sequence voltage with three-phase balanced resistance. Experiments show that the online detection limit of ISCF in low-speed PMSMs is reduced from 5% to 1% (short-circuit ratio) using this method.
Online diagnosis of slight interturn short-circuit fault (ISCF) has always been difficult in low-speed permanent magnet synchronous motors (PMSMs). It is found that the residual zero-sequence voltage exists in healthy PMSMs due to the inherent unbalance of a low-speed motor. This article proposes a new ISCF diagnosis method based on zero-sequence voltage vector decomposition to solve this problem. The voltage vector whose phase angle is closest to the ISCF phase angle is extracted from the zero-sequence voltage vector, which improves the sensitivity of fault phase identification. Furthermore, the method of extracting phase voltage from PWM duty-cycle control voltage is proposed, which can reduce the error caused by measuring zero-sequence voltage with three-phase balanced resistance. Experiments demonstrate that the online detection limit of ISCF is reduced from 5% to 1% (short-circuit ratio) for a low-speed PMSM.
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