Design and Demonstration 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/tia.2017.2784799

Cited by 94 publications

(17 citation statements)

References 14 publications

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“…Due to the small coupling capacitance in air, the solution is suitable for low-power excitation applications [126]. However, hydrodynamic CPTs can provide a larger excitation power [127]. Moreover, they represent an advantageous technology in terms of weight, volume and construction simplicity.…”

Section: ) Cpt (B15)mentioning

confidence: 99%

Excitation System Technologies for Wound-Field Synchronous Machines: Survey of Solutions and Evolving Trends

et al. 2019

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Wound-field synchronous machines (WFSMs) are included in the majority of large power generating units and special high-power motor drives, due to their high efficiency, flexible field excitation and intrinsic flux weakening capability. Moreover, they are employed in a wide range of high-end solutions in the low-to-medium power range. This contribution presents a comprehensive survey of classical and modern methods and technologies for excitation systems (ESs) of WFSMs. The work covers the fundamental theory, typical de-excitation methods and all the modern excitation equipment topologies in detail. It also includes a description of the state-of-the-art and the latest trends in the ESs of wound-field synchronous motors and generators. The purpose of the paper is to provide a useful and up-to-date reference for practitioners and researchers in the field.

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Section: ) Cpt (B15)mentioning

confidence: 99%

Excitation System Technologies for Wound-Field Synchronous Machines: Survey of Solutions and Evolving Trends

et al. 2019

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“…In (1), the field torque term and the reluctance torque term should be in the same d-q axis coordinates. Here, the d f -axis of the field torque is considered as the d-axis standard.…”

Section: Torque-angle Consistency Principlementioning

confidence: 99%

“…Wound field synchronous machines (WFSMs) are drawing increasing attention because they are not limited by a magnet and flexible flux regulation in various applications, such as electric vehicles [1], steam turbines [2], and wind turbines [3]. Nevertheless, the efficiency and torque/power density of a WFSM is generally lower than that of a permanent magnet synchronous machine (PMSM) because of the copper loss of the rotor winding and the brush system.…”

Section: Introductionmentioning

confidence: 99%

Analytical Design of a Hybrid-Excited Wound Field Synchronous Machine for the Improvement of Torque Characteristics

Chai

Kwon

2020

IEEE Access

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This paper proposed a novel hybrid-excited wound field synchronous machine (HE-WFSM) to efficiently use the field torque and reluctance torque. Meanwhile, an analytical method is utilized to achieve the torque-angle consistency principle, which allows the field torque and the reluctance torque to reach their maximum values at the same phase current angle. First, a novel HE-WFSM with two different rotor excitations is proposed. Second, the PMs and the field windings in the rotor are designed by an analytical method based on the magnetic equivalent circuit (MEC) to produce the same magnetic flux in the air gap to obtain the torque-angle consistency. Third, one practical HE-WFSM applied for a small power fan is designed by the analytical method as an example. Finally, all the performances of the proposed HE-WFSM are predicted by the finite element method (FEM), thereby verifying the improved torque characteristics. INDEX TERMS Wound field synchronous machine, hybrid excitation, reluctance torque, field torque.

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“…Yet these machines are not comparable to PM machines which do not require complicated field‐excitation mechanisms. Besides, the efficiency, power, torque densities, and power factor of PM machines are observed to be higher than the typical induction, and synchronous machines 5‐6 . However, PM synchronous machines suffer from a few fundamental problems such as non‐adjustable flux and the possibility of excitation loss.…”

Section: Introductionmentioning

confidence: 99%

Brushless field‐excitation method for wound‐rotor synchronous machines

Bukhari

Ahmad

Akhtar

et al. 2021

Int Trans Electr Energ Syst

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Summary This paper proposes a simplified harmonic field‐excitation scheme for the brushless operation of wound‐rotor synchronous machines (WRSMs). The proposed scheme involves two inverters that are operating at different frequencies to provide an input current to the armature winding of the machine. One of these two inverters works at a frequency of 60 Hz and provides the regular three‐phase fundamental current, whereas the second inverter works at 180 Hz frequency to supply the single‐phase third‐harmonic to the common point of the start‐connected stator winding of the machine. The proposed method has the advantage that a conventional single‐phase inverter can be used for generating the third‐harmonic current which only needs to be operated at three times the frequency of the first inverter supplying the three‐phase fundamental current. The fundamental three‐phase current generates the main armature field, and the single‐phase third‐harmonic current produces a pulsating magnetomotive force, that induces electromotive force (EMF) in the harmonic winding of the rotor. The induced EMF is rectified to supply field current to the rotor and generates the rotor field. This field, when interacts with the main armature field, produces torque. The proposed brushless field‐excitation scheme for WRSMs is implemented in JMAG‐Designer version 19.1 using 2‐D finite element analysis to realize its operation and analyze its performance.

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Design and Demonstration of a Wound Field Synchronous Machine for Electric Vehicle Traction With Brushless Capacitive Field Excitation

Cited by 94 publications

References 14 publications

Excitation System Technologies for Wound-Field Synchronous Machines: Survey of Solutions and Evolving Trends

Excitation System Technologies for Wound-Field Synchronous Machines: Survey of Solutions and Evolving Trends

Analytical Design of a Hybrid-Excited Wound Field Synchronous Machine for the Improvement of Torque Characteristics

Brushless field‐excitation method for wound‐rotor synchronous machines

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