Abstract
In the last decade, the interest for higher reliability in several industrial applications has boosted the research activities in multiphase permanent magnet synchronous motors realized by multiple three-phase winding sets. In this study, a mathematical model of an asymmetric surface-mounted six-phase permanent magnet synchronous motor under high resistance connections was developed. By exploiting the intrinsic properties of multiphase machines in terms of degrees of freedom, an improved field-oriented control scheme is presented that allows online fault detection and a quite undisturbed operating condition of the machine under high resistance connections. More specifically, the proposed strategies for online fault-detection and fault-tolerance are based on the use of multi-reference frame current regulators. The feasibility of the proposed approach was theoretically analyzed, then confirmed by numerical simulations. In order to validate experimentally the proposed strategies, the entire control system was implemented using TMS-320F2812 based platform.
Highlights
Multiphase permanent magnet synchronous machines (m-φ PMSMs) have gained significant attention, in variable-speed drives and generation systems, during the last decade
The presented strategy is based on the use of multiple space vector transformations for developing a new mathematical model able to deal with stator winding affected by high resistance connection (HRC), and on the use of multi-reference frame current regulators for implementing an improved field-oriented control (IFOC) scheme
The main contribution of the study is the presentation of a new mathematical model of an asymmetric six-phase PMSM under HRC fault, which exploits the additional degrees of freedom given asymmetric six-phase PMSM under HRC fault, which exploits the additional degrees of freedom by the use of multi α–β planes adopted for describing the behavior of the machine
Summary
Multiphase permanent magnet synchronous machines (m-φ PMSMs) have gained significant attention, in variable-speed drives and generation systems, during the last decade. The verified good performances in terms of detection and fault-tolerance, the use of current amplitude space vector for the proposed diagnosis technique may show some limitations when changing the operating conditions of the machine. The existing papers on this type of fault are dealing with three-phase machines, but to the best of the author’s knowledge, no recent papers were published investigating HRC in 6-φ PMSMs. The presented strategy is based on the use of multiple space vector transformations for developing a new mathematical model able to deal with stator winding affected by HRC, and on the use of multi-reference frame current regulators for implementing an improved field-oriented control (IFOC) scheme.
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