Design of a wound field synchronous machine for electric vehicle traction with brushless capacitive field excitation

Gioia, Antonio Di; Brown, Ian; Nie, Yi-Hang; Knippel, Ryan; Ludois, Daniel C.; Dai, Jufeng; Hagen, Skyler; Alteheld, Christian

doi:10.1109/ecce.2016.7855023

Cited by 17 publications

(5 citation statements)

References 10 publications

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“…Capacitive WPT ESs have been developed over a series of papers starting with [45], in which a parallel disc capacitor arrangement is used to excite a 1.5kW machine. A similar stacked plate arrangement for an 80kW traction machine is shown in [46], followed by using printed circuit boards as the capacitive coupling in [47] for a 30kW generator. Alternative coupling arrangements using fluid bearings [48] and journal bearings [49] have also be demonstrated.…”

Section: B Capacitive Wpt Excitationmentioning

confidence: 99%

Exciterless Wound-Field Medium-Power Synchronous Machines: Their History and Future

Fallows

Nuzzo

Galea

2022

EEE Ind. Electron. Mag.

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The excitation system of the wound field synchronous machine has remained largely unchanged over the past 50 years. Nonetheless there has been significant research into exciterless solutions which, through integration of the excitation system with the main machine, aim to offer improved power density, simplified manufacture, and better cooling opportunities. This work presents the history of exciterless solutions for wound-field synchronous machines focusing on the challenges for medium power generators. The very latest innovations are discussed, signposting the future for the exciterless machine along with new challenges and opportunities for engineers.

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Section: B Capacitive Wpt Excitationmentioning

confidence: 99%

Exciterless Wound-Field Medium-Power Synchronous Machines: Their History and Future

Fallows

Nuzzo

Galea

2022

EEE Ind. Electron. Mag.

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“…In the above equation The controlled armature winding currents can be expressed as: Bring Equation (5) to Equation (4), and add the MMF of three-phase armature windings a, b, and c. The net MMF (F abc ) of the armature winding is expressed as:…”

Section: Machine Topology and Working Principlementioning

confidence: 99%

“…Given the potential in WFSM, due to its low-price benefit, an inherent problem of its assembly of brushes and slip rings must be solved for comparison. In small capacity applications, operating it without brushes and slip rings will be convenient [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Novel Single Inverter-Controlled Brushless Wound Field Synchronous Machine Topology

et al. 2021

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This paper proposes a novel brushless excitation topology for a three-phase synchronous machine based on a customary current-controlled voltage source inverter (VSI). The inverter employs a simple hysteresis-controller-based current control scheme that enables it to inject a three-phase armature current to the stator winding which contains a dc offset. This dc offset generates an additional air gap magneto-motive force (MMF). On the rotor side, an additional harmonic winding is mounted to harness the harmonic power from the air gap flux. Since a third harmonic flux is generated in this type of topology, the machine structure is also modified to accommodate the third harmonic rotor winding to have a voltage induced as the rotor rotates at synchronous speed. Specifically, four-pole armature and field winding patterns are used, whereas the harmonic winding is configured for a twelve-pole pattern. A diode rectifier is also mounted on the rotor between the harmonic and field windings. Therefore, the generated voltage on the harmonic winding feeds the current to the field winding for excitation. A 2D-finite element analysis (FEA) in JMAG-Designer was carried out for performance evaluation and verification of the topology. The simulation results are consistent with the proposed theory. The topology could reduce the cost and stator winding volume compared to a conventional brushless machine, with good potential for various applications.

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“…Besides their electromagnetic functions, pole tips are typically used as mechanical structures to withstand centrifuge forces caused by field windings. Therefore, very high mechanical stress levels can be registered at the rotor bore and pole tips [75].…”

Section: Mechanical Challenges For Wfsgs Implemented For Variable Speed Systemsmentioning

confidence: 99%

Challenges and Opportunities for Wound Field Synchronous Generators in Future More Electric Aircraft

Yin-li

Nuzzo

Zhang

et al. 2020

IEEE Trans. Transp. Electrific.

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Electrical machines and drives keep moving away from traditional technologies such as brushed machines and wound field machines towards lighter, 'easier to maintain' machines. A very interesting aspect is that certain transport applications, especially the aerospace industry, still favour the classical wound field machine for its main generating system such as the Boeing 787.This paper focuses on investigating this particular trend by presenting a detailed overview of historical power generation systems on aircraft. This paper compares the current state of the art of wound field machines with other generator families. The results of this analysis are then projected into the needs of the electrical power generation and distribution system on aircraft. While power density is a major objective for any aerospace application, however the extra benefits associated with wound field systems are still essential in modern aircraft.The paper then focuses on the main challenges for improving power density of wound field machines. Recommendations, opportunities and improvements related to wound field machines are discussed. In conclusion, if robust designs for higher speed wound field generators were consolidated, it would be very probable that these classical machines might still be implemented on future MEA platforms.

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Design of a wound field synchronous machine for electric vehicle traction with brushless capacitive field excitation

Cited by 17 publications

References 10 publications

Exciterless Wound-Field Medium-Power Synchronous Machines: Their History and Future

Exciterless Wound-Field Medium-Power Synchronous Machines: Their History and Future

Novel Single Inverter-Controlled Brushless Wound Field Synchronous Machine Topology

Challenges and Opportunities for Wound Field Synchronous Generators in Future More Electric Aircraft

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