The permanent magnet synchronous machine can be isotropic (SPMSM) or anisotropic (PMSM) and, during its operational life, it can be subject to various types of faults. In the literature, various methods are being studied to detect each type of fault and to ensure extended operation of the machine following a fault, confining the propagation of the damaged parts of the motor. This objective is usually achieved by limiting the machine's performance following the fault, compared to the performance it could provide during normal operation. In this paper, the machine analyzed is an SPMSM subject to a fault already identified in its stator winding, specifically a fault between adjacent turns of one of the coils in the stator winding. The objective of this work is to evaluate the performance of an SPMSM affected by a short-circuit fault between turns, which has led to a coil-to ground fault, in which the parallel path containing the faulty coil is disconnected to preserve machine operation at reduced performance, thereby temporarily delaying the machine shutdown for maintenance purposes. The paper is structured by initially presenting an overview of the state-of-the-art on possible fault-tolerant control strategies for a permanent magnet synchronous machine subject to a fault in the stator winding. Subsequently, the construction details of the machine and the connection diagrams are presented, followed by the introduction of the circuit model of the permanent magnet. The paper continues by first analyzing the coil and phase magnetomotive forces on the thickness of the air gap + magnets to obtain expressions for the rotating stator fields in this thickness, and then it examines how to derive the expressions of the rotating fields both in the air gap and in the thickness of the magnets. This division is ultimately useful for calculating the total magnetic co-energy in the machine, and subsequently, the electromagnetic torque of the SPMSM.
La macchina sincrona a magneti permanenti può essere isotropa (SPMSM) o anisotropa (PMSM) e, durante l’arco della sua vita operativa, essa può essere soggetta a diversi tipi di guasto. In letteratura, si stanno studiando diversi metodi per rilevare ciascun tipo di guasto e per garantire un’operazione prolungata della macchina a seguito del guasto, confinando la propagazione delle parti guaste del motore. Tale obiettivo viene solitamente raggiunto limitando le prestazioni della macchina a seguito del guasto, rispetto a quelle che essa potrebbe garantire durante la sua normale operazione. In questo elaborato, la macchina analizzata è una SPMSM soggetta ad un guasto già identificato nel suo avvolgimento statorico, precisamente si tratta di un guasto tra spire adiacenti di una delle diverse bobine che fanno parte dell’avvolgimento statorico. L’obiettivo del presente elaborato è quello di valutare le prestazioni di una SPMSM interessata da un guasto di corto-circuito tra spire sfociato in un guasto bobina-massa, in cui la via parallela contenente la bobina guasta viene scollegata per preservare il funzionamento della macchina a prestazioni ridotte, ritardando, quindi, temporaneamente l’arresto della macchina per questioni di manutenzione. L’elaborato è strutturato presentando inizialmente una panoramica dello stato dell’arte sulle possibili strategie di controllo tolleranti al guasto di una macchina sincrona a magneti permanenti soggetta ad un guasto nell’avvolgimento statorico. Successivamente, vengono presentati i dettagli costruttivi della macchina e gli schemi di connessione e in seguito viene introdotto il modello circuitale del magnete permanente. L’elaborato prosegue dapprima analizzando le forze magnetomotrici di bobina e fase sullo spessore traferro + magneti per ottenere le espressioni dei campi rotanti statorici in tale spessore e, poi, si analizza come ricavare le espressioni dei campi rotanti sia nel traferro che nello spessore dei magneti. Tale ripartizione risulta utile, infine, per calcolare dapprima la coenergia magnetica totale nella macchina e in seguito la coppia elettromagnetica della SPMSM.
Analisi operativa di una macchina sincrona e isotropa a magneti permanenti soggetta ad un guasto nell'avvolgimento statorico
HOTI, DARIO
2023/2024
Abstract
The permanent magnet synchronous machine can be isotropic (SPMSM) or anisotropic (PMSM) and, during its operational life, it can be subject to various types of faults. In the literature, various methods are being studied to detect each type of fault and to ensure extended operation of the machine following a fault, confining the propagation of the damaged parts of the motor. This objective is usually achieved by limiting the machine's performance following the fault, compared to the performance it could provide during normal operation. In this paper, the machine analyzed is an SPMSM subject to a fault already identified in its stator winding, specifically a fault between adjacent turns of one of the coils in the stator winding. The objective of this work is to evaluate the performance of an SPMSM affected by a short-circuit fault between turns, which has led to a coil-to ground fault, in which the parallel path containing the faulty coil is disconnected to preserve machine operation at reduced performance, thereby temporarily delaying the machine shutdown for maintenance purposes. The paper is structured by initially presenting an overview of the state-of-the-art on possible fault-tolerant control strategies for a permanent magnet synchronous machine subject to a fault in the stator winding. Subsequently, the construction details of the machine and the connection diagrams are presented, followed by the introduction of the circuit model of the permanent magnet. The paper continues by first analyzing the coil and phase magnetomotive forces on the thickness of the air gap + magnets to obtain expressions for the rotating stator fields in this thickness, and then it examines how to derive the expressions of the rotating fields both in the air gap and in the thickness of the magnets. This division is ultimately useful for calculating the total magnetic co-energy in the machine, and subsequently, the electromagnetic torque of the SPMSM.File | Dimensione | Formato | |
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https://hdl.handle.net/10589/230830