Optimal Design and Experimental Verification of Wound Rotor Synchronous Machine Using Subharmonic Excitation for Brushless Operation

Hussain, Asif; Atiq, Shahid; Kwon, Byung-il

doi:10.3390/en11030554

Cited by 19 publications

(47 citation statements)

References 24 publications

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“…Furthermore, three advanced brushless field excitation methods were developed in recent times: harmonic, inductive, and capacitive power transfer [9]. Few major research investigations were done to discover the feasibility of higher-order harmonic and sub-harmonic MMF components to provide adequate power to the WFSM field winding [11][12][13][14][15][16][17]. Higher-order harmonics that are generated from the 3-phase stator MMF were used for a brushless set-up encountering additional harmonic losses [11].…”

Section: Introductionmentioning

confidence: 99%

A Novel Sub-Harmonic Synchronous Machine Using Three-Layer Winding Topology

Rafin

Ali

Lipo

2022

WEVJ

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This paper proposes a novel brushless synchronous machine topology that utilizes stator sub-harmonic magnetomotive force (MMF) for desirable brushless operation. The sub-harmonic MMF component that is used in this novel topology is one fourth of the fundamental MMF component, whereas, in previous practices, it was half. To achieve the brushless operation, the novel machine uses a unique stator winding configuration of two sets of balanced 3-phase winding wound in 3 layers. For the rotor, additional winding is placed to induce the sub-harmonic component to achieve the brushless excitation. Unlike its predecessors, it utilizes maximum allowable space in the stator to house conductors in all of its slots. To implement the topology, 8-pole, 48-slot sub-harmonic brushless synchronous machine model has been designed. A 2-D finite element analysis (FEA) is used to simulate and validate the performance of the novel machine as a motor. The proposed topology shows better average torque than the existing sub-harmonic wound rotor brushless synchronous machine topologies.

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Section: Introductionmentioning

confidence: 99%

A Novel Sub-Harmonic Synchronous Machine Using Three-Layer Winding Topology

Rafin

Ali

Lipo

2022

WEVJ

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“…Regardless of offering several advantages such as high torque density, power density, efficiency, and power factor, permanent magnet (PM) machines are getting less consideration these days [1][2][3][4][5][6][7] due to the increasing cost of rare-earth metals required to build PM machines. Besides the high cost, the extraction of rare-earth metals to attain continuous supply for the industries manufacturing PM electrical machines has also raised environmental concerns.…”

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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“…To eliminate the above‐mentioned inherent deficiencies associated with conventional WRSMs, several researchers have proposed brushless topologies 14‐17 . These brushless topologies were developed considering third‐harmonic field‐excitation technology 18…”

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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Optimal Design and Experimental Verification of Wound Rotor Synchronous Machine Using Subharmonic Excitation for Brushless Operation

Cited by 19 publications

References 24 publications

A Novel Sub-Harmonic Synchronous Machine Using Three-Layer Winding Topology

A Novel Sub-Harmonic Synchronous Machine Using Three-Layer Winding Topology

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

Brushless field‐excitation method for wound‐rotor synchronous machines

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