Novel Sub-Harmonic-Based Self-Excited Brushless Wound Rotor Synchronous Machine

Bukhari, Syed Sabir Hussain; Shah, Madad Ali; Rodas, Jorge; Bajaj, Mohit; Ro, Jong‐Suk

doi:10.1109/icjece.2022.3200146

Cited by 7 publications

(6 citation statements)

References 20 publications

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“…The rotor of both machine designs contains a single-or three-phase diode rectifier model built using ANSYS Maxwell Circuit Design package, as shown in Figures 4. 24 The completed rectifier models are imported into the machine models in ANSYS Maxwell 2D using the external circuit excitation settings for the transformer and field windings.…”

Section: Finite Element Analysis (Fea) Model Using Ansys Maxwellmentioning

confidence: 99%

Brushless Self-Excited Synchronous Field-Winding Machine With Five- and Higher-Phase Design Using Independently Controlled Spatial Harmonics

Chung

Hofmann

2024

IEEE Trans. Energy Convers.

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Electric machines used in a variety of sustainable energy applications need to possess high power density, high efficiency, and low manufacturing cost. While permanent-magnet machines and synchronous field-winding machines are the popular option for variable-speed drives, these topologies have undesirable aspects. The magnets in permanent-magnet machines are typically made of rare-earth materials which have high price volatility and are prone to demagnetization, risking machine operation. The synchronous field-winding machines require additional electrical and mechanical components requiring regular maintenance and replacement and add extra volume, weight, and cost to the drive system.In this dissertation, a novel brushless self-excitation scheme for synchronous field-winding machines is presented. This scheme uses an AC stator with five or higher phases to create two independently controlled rotating magnetic fields at different spatial harmonics, allowing independent magnetic coupling with different rotor windings. The rotor of the proposed machine possesses a field winding, transformer windings, and a diode rectifier that converts induced AC voltages in the transformer windings into a DC voltage for the field winding. A design for a five-phase stator configuration is developed using finite-element analysis tools, and simulation results are presented. Torque and power characteristics of the design are compared with similarly-sized interior permanent-magnet and induction machines.xi

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Section: Finite Element Analysis (Fea) Model Using Ansys Maxwellmentioning

confidence: 99%

Brushless Self-Excited Synchronous Field-Winding Machine With Five- and Higher-Phase Design Using Independently Controlled Spatial Harmonics

Chung

Hofmann

2024

IEEE Trans. Energy Convers.

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“…However, due to the high cost of rare earth magnets, researchers have developed multiple PM-less synchronous machine topologies. These topologies are either based on sub-harmonics or third-harmonics field excitation methods [4][5][6][7][8][9][10]. Traditional wound rotor synchronous machines (WRSMs) require brushes and slip rings to supply excitation current to the rotor field windings.…”

Section: Introductionmentioning

confidence: 99%

Torque Ripple Reduction in Brushless Wound Rotor Vernier Machine Using Third-Harmonic Multi-Layer Winding

Zulqarnain,

Hammad,

Ikram

et al. 2024

WEVJ

Self Cite

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This article aims to realize the brushless operation of a wound rotor vernier machine (WRVM) by a third-harmonic field produced through stator auxiliary winding (X). In the conventional model, a third-harmonic current is generated by connecting a 4-pole armature and 12-pole excitation windings serially with a three-phase diode rectifier to develop a pulsating field in the airgap of a machine. However, in the proposed model, the ABC winding is supplied by a three-phase current source inverter, whereas the auxiliary winding (X) carries no current due to an open circuit. The fundamental MMF component developed in the machine airgap creates a four-pole stator field, while the third-harmonic MMF induces the harmonic current in the specialized rotor harmonic winding. The rotor on the other side contains the harmonic and the field windings connected through a full-bridge rectifier. The electromagnetic interaction of the stator and rotor fields generates torque. Due to the open-circuited winding pattern, the proposed machine results in a low torque ripple. A 2D model is designed using JMAG-Designer, and 2D field element analysis (FEA) is carried out to determine the output torque and machine’s efficiency. A comparative performance analysis of both the conventional and proposed topologies is discussed graphically. The quantitative analysis of the proposed topology shows better performance as compared to the recently developed third-harmonic-based brushless WRVM topology in terms of output torque and torque ripples.

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“…One of the approaches to overcome this problem is to use a rotary transformer operating at high frequency [8][9][10]. Other research towards the brushless excitation is to utilize the synchronous machine as a device for self-excitation and torque production [11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…In References [13][14][15][16][17][18][19], the brushless operation of WRSMs was accomplished by generating and employing the fundamental and sub-harmonic components in the MMF for the stator. For the generation of the sub-harmonic component, winding at the stator was specially arranged in these brushless topologies.…”

Section: Introductionmentioning

confidence: 99%

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Wound Rotor Synchronous Motor as Promising Solution for Traction Applications

et al. 2022

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Traction applications, such as electric and hybrid vehicles, require the electrical motor to be operated at low load conditions during most of their driving cycle. Permanent magnet (PM) motors in this case may not be an optimal choice due to their poor efficiency under low load conditions despite the fact that they exhibit the best output characteristics at the rated load. However, the wound rotor synchronous motor (WRSM) demonstrates the best efficiency at low load conditions due to their controllable excitation. This paper presents an interesting comparison of WRSM and the PM motor in terms of their efficiency over the entire drive cycle of traction applications, which demonstrates that WRSMs are more suitable compared to the apparently best performance PM motor. A WRSM with similar dimensions to the 2010 Toyota Prius interior permanent synchronous motor (IPMSM) was designed and optimized in this regard. The performance comparison of the PM motor and the WRSM was presented using 2-D finite element analysis (FEA) for the WRSM and the performance analysis report of the Toyota Prius IPMSM published by the US department of energies. The FEA analysis shows that the WRSM can achieve wide torque speed characteristics. Moreover, the WRSM exhibits better efficiency under low load conditions at the higher speed or field weakening region.

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Novel Sub-Harmonic-Based Self-Excited Brushless Wound Rotor Synchronous Machine

Cited by 7 publications

References 20 publications

Brushless Self-Excited Synchronous Field-Winding Machine With Five- and Higher-Phase Design Using Independently Controlled Spatial Harmonics

Brushless Self-Excited Synchronous Field-Winding Machine With Five- and Higher-Phase Design Using Independently Controlled Spatial Harmonics

Torque Ripple Reduction in Brushless Wound Rotor Vernier Machine Using Third-Harmonic Multi-Layer Winding

Wound Rotor Synchronous Motor as Promising Solution for Traction Applications

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