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Abstract
The Dual-Redundancy Permanent Magnet Synchronous Motor (DRPMSM) with weak thermal coupling and no electromagnetic coupling among phase windings has two sets of three-phase symmetrical windings. Under normal conditions, two sets of windings can operate simultaneously, and once one set has an inter-turn short circuit fault (ISCF), the other set will operate alone, so a DRPMSM can be applied in fields with high reliability requirements. According to the equivalent circuit principle, a simplified model of a DRPMSM when ISCF occurs is established in this paper, and mathematical equations for the equivalent resistance, inductance and induction electromotive force (EMF) are derived. Based on the simplified circuit principle and instantaneous power theory, combined with the analysis of the fundamental wave in the two sets, an online diagnosis method of the ISCF for DRPMSM is proposed based on the reactive power difference and the feasibility of the method is verified by experiments.
Highlights
The Dual-Redundancy Permanent Magnet Synchronous Motor (DRPMSM) with weak thermal coupling and no electromagnetic coupling between phase winding is powered by two inverters
Simulation and experimental verification of the above sections, it is feasible that the method of an online diagnosis for the inter-turn short circuit fault (ISCF) of the DRPMSM based on instantaneous power theory proposed in this paper
This paper focuses on a simplified circuit model of the DRPMSM after the ISCF occurs where
Summary
The DRPMSM with weak thermal coupling and no electromagnetic coupling between phase winding is powered by two inverters. In [4], a simple method of diagnosing the ISCF for three-phase windings with star connections is proposed This method does not depend on the precise phasor calculation of voltage and current, but the analysis of voltage in the neutral point to realize the diagnosis. In [8], the influence of22different slot-pole match and the ISCF position of fault-tolerant PMSM on motor efficiency and short-circuit winding has has an an ISCF. ISCF occurs, occurs,and andas asaaconsequence, consequence,many manyof of winding the conventional diagnostic methods that characteristics currents suitable theconventional conventional diagnostic methods thatuse usethe thefault faultcharacteristics characteristicsof ofof currents areare notnot suitable for for the diagnostic methods that use the fault currents are not suitable for this this type of DRPMSM.
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