The present work reports an analysis of Inductive Coupled Power Transfer systems behaviour applied to electrical bikes. In particular, the study has focused on the design and stability of the coupled coils of this system. In the first part of the work, the theoretical aspects of the wireless power system are handled. Here, the principal laws and relations that control the equivalent circuit are expressed. The voltages and the currents of the system are defined and the power transfer and the working frequency are analysed. In particular, the attention has focalized on the compensation topologies and on their stability in otder to allow to the system to work in resonance condition. Lastly, this section copes with the ICPT systems classification and their applications. In the second part of the work, the inductive features of the coupled windings are analysed. Basing on simulations performed in previous research studies, some configurations have been supposed, obtaining their auto inductance and mutual inductance values. In order to perform this process, the Ansys Maxwell software has been used, performing 3D simulations. In all the cases, the simulations have been performed keeping constant the feature of the cables and of the simulation process. This in order to obtain comparable results. In the end, the configuration that presents the best performance has been chosen and its stability as a function of the frequency is studied. The configuration considered for the stability analysis, suggested by the author, presents a high mechanical coupling degree; however, it guarantees the best coupling factor with a small air-gap. The stability is analysed managing the number of turns of the coils till the stable behaviour is achieved.
Il presente lavoro tratta una analisi del comportamento dei sistemi di ricarica wireless applicati alle biciclette elettriche. In particolare, lo studio si è concentrato sul design e sulla stabilità delle bobine mutualmente accoppiate di tale sistema. Nella prima parte del lavoro sono stati affrontati gli aspetti teorici dei sistemi ICPT (Inductive coupled power transfer). Qui sono state espresse le principali leggi e relazioni che regolano il funzionamento del circuito equivalente, definendo le tensioni e le correnti presenti nel sistema passando poi alla potenza trasferita e alla frequenza di lavoro. Particolare attenzione è stata posta sulle topologie di compensazione e sulla loro stabilità, in modo da permettere al sistema di lavorare in condizioni di risonanza. In seguito, è stata affrontata una classificazione dei sistemi di ricarica wireless e delle loro applicazioni. Nella seconda parte del lavoro sono state analizzate le caratteristiche induttive degli avvolgimenti accoppiati. Basandosi su simulazioni effettuate in precedenti studi di ricerca, sono state ipotizzate diverse configurazioni per le bobine, ottenendo i valori di auto induttanza e mutua induttanza. Questo processo è stato effettuato attraverso il software Ansys Maxwell, eseguendo simulazioni in 3D. In tutti i casi, le simulazioni sono state effettuate applicando le stesse caratteristiche del filo e gli stessi parametri di soluzione, questo in modo da ottenere risultati comparabili tra di loro. Infine, è stata scelta la configurazione con le migliori performance per studiarne la stabilità in funzione della frequenza. La configurazione presa in considerazione per lo studio della stabilità, suggerita dall’autore, richiede un maggiore accoppiamento meccanico; tuttavia, questa garantisce il miglior fattore di accoppiamento magnetico con un air-gap ridotto. La stabilità è stata analizzata variando solo il numero di avvolgimenti delle bobine, fino a raggiungere un comportamento stabile del sistema.
Wireless power transfer system design and analysis for e-bikes application
GENCO, FEDERICO
2018/2019
Abstract
The present work reports an analysis of Inductive Coupled Power Transfer systems behaviour applied to electrical bikes. In particular, the study has focused on the design and stability of the coupled coils of this system. In the first part of the work, the theoretical aspects of the wireless power system are handled. Here, the principal laws and relations that control the equivalent circuit are expressed. The voltages and the currents of the system are defined and the power transfer and the working frequency are analysed. In particular, the attention has focalized on the compensation topologies and on their stability in otder to allow to the system to work in resonance condition. Lastly, this section copes with the ICPT systems classification and their applications. In the second part of the work, the inductive features of the coupled windings are analysed. Basing on simulations performed in previous research studies, some configurations have been supposed, obtaining their auto inductance and mutual inductance values. In order to perform this process, the Ansys Maxwell software has been used, performing 3D simulations. In all the cases, the simulations have been performed keeping constant the feature of the cables and of the simulation process. This in order to obtain comparable results. In the end, the configuration that presents the best performance has been chosen and its stability as a function of the frequency is studied. The configuration considered for the stability analysis, suggested by the author, presents a high mechanical coupling degree; however, it guarantees the best coupling factor with a small air-gap. The stability is analysed managing the number of turns of the coils till the stable behaviour is achieved.| File | Dimensione | Formato | |
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Descrizione: Wireless Power Transfer System Design and Analysis for E-bikes Application
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https://hdl.handle.net/10589/145585