Brushless wound field synchronous machine with third-harmonic field excitation using a single inverter

Ayub, Muhammad; Bukhari, Syed Sabir Hussain; Jawad, Ghulam

doi:10.1007/s00202-019-00763-3

Cited by 18 publications

(21 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1(c). In [13], the same armature current was obtained by alternately operating two inverters. These inverters were attached in parallel as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Simplified Brushless Wound Field Synchronous Machine Topology Based on a Three-Phase Rectifier

et al. 2021

Self Cite

View full text Add to dashboard Cite

“…1(c). In [13], the same armature current was obtained by alternately operating two inverters. These inverters were attached in parallel as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Simplified Brushless Wound Field Synchronous Machine Topology Based on a Three-Phase Rectifier

et al. 2021

Self Cite

View full text Add to dashboard Cite

“…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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…In this topology, the required armature current shape is attained using a dual-inverter configuration without employing the thyristor switches. The proposed topology is also realized by using a modified inverter that has a different number of switches when compared to the typical three-phase inverter topology in [20].…”

Section: Introductionmentioning

confidence: 99%

High-Harmonic Injection-Based Brushless Wound Field Synchronous Machine Topology

et al. 2021

Self Cite

View full text Add to dashboard Cite

This paper discusses the design and analysis of a high-harmonic injection-based field excitation scheme for the brushless operation of wound field synchronous machines (WFSMs) in order to achieve a higher efficiency. The proposed scheme involves two inverters. One of these inverters provides the three-phase fundamental-harmonic current to the armature winding, whereas the second inverter injects the single-phase high-harmonic i.e., 6th harmonic current in this case, to the neutral-point of the Y-connected armature winding. The injection of the high-harmonic current in the armature winding develops the high-harmonic magnetomotive force (MMF) in the air gap of the machine beside the fundamental. The high-harmonic MMF induces the harmonic current in the excitation winding of the rotor, whereas the fundamental MMF develops the main armature field. The harmonic current is rectified to inject the direct current (DC) into the main rotor field winding. The main armature and rotor fields, when interacting with each other, produce torque. Finite element analysis (FEA) is carried out in order to develop a 4-pole 24-slot machine and investigate it using a 6th harmonic current injection for the rotor field excitation to both attain a brushless operation and analyze its electromagnetic performance. Later on, the performance of the proposed topology is compared with the typical brushless WFSM topology employing the 3rd harmonic current injection-based field excitation scheme.

show abstract

Brushless wound field synchronous machine with third-harmonic field excitation using a single inverter

Cited by 18 publications

References 15 publications

Simplified Brushless Wound Field Synchronous Machine Topology Based on a Three-Phase Rectifier

Simplified Brushless Wound Field Synchronous Machine Topology Based on a Three-Phase Rectifier

Brushless field‐excitation method for wound‐rotor synchronous machines

High-Harmonic Injection-Based Brushless Wound Field Synchronous Machine Topology

Contact Info

Product

Resources

About