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Dipartimento di Ingegneria "Enzo Ferrari"

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2023 - Optimal Sizing of Hairpin Conductors in highway operation with PWM power supply [Relazione in Atti di Convegno]
Notari, R.; Devito, G.; Bernardi, F.; Pastura, M.; Barater, D.; Nuzzo, S.

Nowadays, one of the key challenges in the design of electric drives' components is the reduction of high losses at high- frequency operations. The aim of this work is to investigate the AC losses in hairpin windings (HWs) triggered by a space vector pulse width modulation (SVPWM) during both maximum torque per Ampere (MTPA) and flux-weakening (F-W) operations of an interior permanent magnet synchronous motor (PMSM). The ensuing additional losses are evaluated and a fast methodology for the conductor sizing is illustrated. Subsequently, after evaluating the harmonic content of the current feeding the electric motor, estimated considering a standardized highway driving cycle, the losses are assessed using analytical and finite element methods (FEM) and then compared with an HW layout taken as benchmark. The results demonstrate that HWs, when appropriately sized, can significantly reduce AC losses compared to conductors optimised for low-speed extra-urban conditions.

2023 - Rare Earth Materials Reduction in a Hypercar Propulsion System [Relazione in Atti di Convegno]
Devito, G.; Puglisi, F.; Barater, D.; Nuzzo, S.; Giacalone, M.; Franceschini, G.

Low-usage and rare earth free high-performance machines are in high demand, pushed by increasing costs and supply issues of rare earth materials. High torque density and high efficiency are key requirements in traction field. The challenge is designing propulsion systems which achieve such objectives while pursuing a global optimization logic in costs. This paper fits into this context by proposing a solution in which the same interior permanent magnet motor design is used for a four-wheel drive of a hypercar. A proper adaptation in axial length and magnets arrangement of the rear axle motor makes it suitable for the front axle requirements. Electromagnetic finite element analyses are performed to test different solutions with and without ferrite magnets. Torque, torque ripple, base speed, efficiency and rare earth reduction are the outputs under investigation. The best configurations are further studied via finite element structural analyses, as well as they are subjected to vibrational considerations. Different eligible solutions are found out with good performance while achieving a reduction in rare earth usage by 45.5%.

2022 - A Simplified Analytical Approach for Hybrid Exciters of Wound-Field Generators [Articolo su rivista]
Devito, Giampaolo; Nuzzo, Stefano; Barater, Davide; Franceschini, Giovanni

2022 - Combined Magnet Shaping and Asymmetries in Surface-Mounted Permanent Magnet Machines for Improved Torque Performance [Relazione in Atti di Convegno]
Devito, Giampaolo; Nuzzo, Stefano; Barater, Davide; Soltani, Mohammad; Franceschini, Giovanni

2021 - Design of the propulsion system for a formula sae racing car based on a brushless motor [Relazione in Atti di Convegno]
Devito, G.; Nuzzo, S.; Barater, D.; Franceschini, G.; Papini, L.; Bolognesi, P.

Today, an ever-increasing interest in electric propulsion is occurring due to the need of decarbonizing the society in order to avoid a catastrophic climate collapse. To raise awareness on this challenge, Formula SAE, an international university competition in engineering design, has also established an electric propulsion championship. This paper proposes a low budget motor propulsion system for Formula SAE racing cars. The design is based on realistic data available from previous race editions and suitably analyzed for the application at hand. Besides the budget limitation, which constitutes the main design guideline in this work, a set of constraints imposed by the race regulations are considered. Consequently, the performance requirements are defined, and the ensuing propulsion motor design is carried out through a preliminary analytical sizing followed by a finite-element validation and refinement. A good trade-off between cost and performance is achieved in terms of motor design and overall propulsion system architecture.