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

Bukhari, Syed Sabir Hussain; Ahmad, H.; Sirewal, Ghulam Jawad; Ro, Jong‐Suk

doi:10.1109/access.2021.3049561

Cited by 10 publications

(12 citation statements)

References 14 publications

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“…A 4-pole 24-slot (4p24s) machine is utilized to validate the operation of the proposed high-harmonic injection-based WFSM topology. This machine is adopted from [16]. The structure of the employed machine along with its armature and rotor winding configurations are presented in Figure 3.…”

Section: Methodology 21 Proposed Topologymentioning

confidence: 99%

“…The usage of brushes in a typical WFSM increases its maintenance cost due to their periodic replacement and continuous sparking. On the other hand, an additional exciter rises the overall size and cost of the system [15][16][17][18]. Therefore, to get rid of the obligation of brushes, slip rings, and additional exciters, a number of brushless topologies have been presented by various researchers in the available literature.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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Section: Methodology 21 Proposed Topologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…To validate the operation and investigate the performance of the customary and proposed BL-WRSM topologies based on sub-harmonic field-excitation technique, finite element analysis (FEA) is carried out using the JMAG-Designer version 19.1. A 4p24s machine is adopted from [17] and is employed for this purpose whose parameters are listed in Table 1. The FEA parameters of the employed machine are presented in Table 2.…”

Section: Electromagnetic Analysismentioning

confidence: 99%

“…In [17], a BL-WRSM topology realized by utilizing a three-phase rectifier. The inverter provides the regular three-phase current to the stator winding in this topology, whereas a rectifier is employed whose output is connected to the neutral of the Y-connected armature winding.…”

Section: Introductionmentioning

confidence: 99%

High-Efficient Brushless Wound Rotor Synchronous Machine Topology Based on Sub-Harmonic Field-Excitation Technique

et al. 2021

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This paper presents a new high-efficient three-phase brushless wound rotor synchronous machine (BL-WRSM) based on a sub-harmonic field excitation technique. In the proposed machine topology, the stator is equipped with two different three-phase windings: (1) main armature winding, and (2) additional armature winding. The main armature winding is based on a 4-pole winding configuration, whereas the additional armature winding is based on a 2-pole winding configuration. Both windings are supplied current from two different inverters, i.e., inverter-1, inverter-2, and simultaneously. Inverter-1 provides the regular input current to the main armature winding, whereas inverter-2 provides a three-phase current of low magnitude to the 2-pole additional armature winding. This generates an additional sub-harmonic component of MMF in the airgap beside the fundamental MMF. On the other side, the rotor is equipped with (1) harmonic, and (2) field windings. These windings are electrically coupled via a rectifier. The fundamental component of MMF produces the main rotating magnetic field, whereas the sub-harmonic MMF gets induced in the harmonic winding to produce harmonic current. This current is rectified to give DC to the rotor field winding to attain brushless operation. To authenticate the operation and analyze its performance, the proposed BL-WRSM topology is supported using 2-D finite element analysis (FEA) in JMAG-Designer. Later on, the performance of the proposed brushless topology is compared with the customary BL-WRSM topology to verify its high efficiency, high output torque, low torque ripple, and low unbalanced radial force on the rotor.

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“…Although this topology achieved the brush-less operation for WFVMs, the usage of a dual-inverter-outline makes it expensive and increases its overall size. In addition, it exhibits some performance issues such as low average torque, high losses, and low efficiency because of the different magnitude of current flowing in two halves of the armature winding [20]- [23].…”

Section: Introductionmentioning

confidence: 99%

Novel Self-Excited Brush-Less Wound Field Vernier Machine Topology

et al. 2022

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To realize the brush-less operation for wound field vernier machines (WFVMs), a novel selfexcited topology is proposed in this paper which involves a four-pole main armature winding and a twopole excitation winding connected in series using an uncontrolled rectifier. Upon supplying current from a single current-controlled voltage source inverter (VSI), this procedure results in four-pole and two-pole magnetomotive force (MMF) components in the airgap. The four-pole MMF produces the main stator field while the two-pole MMF component develops a sub-harmonic field in the airgap. The rotor is altered to house a forty-four-pole rotor field and two-pole harmonic windings. The two-pole harmonic field is employed to induce a current in the harmonic winding, which is rectified by means of a full-bridge diode rectifier to energize the rotor field winding and realize brush-less operation for WFVM. Two-dimensional finite element analysis (2-D FEA) is implemented in JMAG-Designer to confirm the operation of the proposed WFVM topology and attain the electromagnetic performance for a four-pole, twenty-four-slot outer-rotor vernier machine.INDEX TERMS Wound field vernier machine; harmonic field excitation; self-excited machines; wound rotor.

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

Cited by 10 publications

References 14 publications

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

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

High-Efficient Brushless Wound Rotor Synchronous Machine Topology Based on Sub-Harmonic Field-Excitation Technique

Novel Self-Excited Brush-Less Wound Field Vernier Machine Topology

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