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

2019 ◽  
Vol 101 (1) ◽  
pp. 165-173 ◽  
Author(s):  
Muhammad Ayub ◽  
Syed Sabir Hussain Bukhari ◽  
Ghulam Jawad ◽  
Byung-il Kwon
Keyword(s):  
Synchronous Machine ◽  
Third Harmonic ◽  
Harmonic Field ◽  
Field Excitation

Brushless wound rotor synchronous machine with third-harmonic field excitation

2019 ◽  
Vol 102 (1) ◽  
pp. 259-265 ◽  
Author(s):  
Muhammad Ayub ◽  
Ghulam Jawad Sirewal ◽  
Syed Sabir Hussain Bukhari ◽  
Byung-il Kwon
Keyword(s):  
Synchronous Machine ◽  
Third Harmonic ◽  
Harmonic Field ◽  
Wound Rotor Synchronous Machine ◽  
Field Excitation

scholarly journals Brushless Field Excitation Scheme for Wound Field Synchronous Machines

2020 ◽  
Vol 10 (17) ◽  
pp. 5866
Author(s):  
Syed Sabir Hussain Bukhari ◽  
Ghulam Jawad Sirewal ◽  
Faheem Akhtar Chachar ◽  
Jong-Suk Ro
Keyword(s):  
Synchronous Machines ◽  
Harmonic Current ◽  
Element Analysis ◽  
Magnetomotive Force ◽  
Excitation Scheme ◽  
Third Harmonic ◽  
The Third ◽  
Harmonic Field ◽  
Three Phase ◽  
Field Excitation

A new harmonic field excitation technique for the brushless operation of wound field synchronous machines (WFSMs) is proposed in this paper. The proposed scheme involves conventional three-phase and single-phase inverters operating at different frequencies and supply input current to the armature winding simultaneously. This results in a composite output current of the inverters, which contains fundamental as well as the third harmonic current components. The fundamental is utilized to develop the stator field, on the other hand, the third harmonic is used for developing the pulsating magnetomotive force (MMF) in the airgap. This MMF produces a harmonic current in the harmonic winding of the rotor which is later rectified to inject field current to the rotor field winding. The theoretical analysis of the proposed technique is supported using 2-D finite element analysis (FEA).

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

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4427
Author(s):  
Syed Sabir Hussain Bukhari ◽  
Qasim Ali ◽  
Jesús Doval-Gandoy ◽  
Jong-Suk Ro
Keyword(s):  
High Efficiency ◽  
Harmonic Component ◽  
Torque Ripple ◽  
Synchronous Machine ◽  
Rotating Magnetic Field ◽  
Harmonic Field ◽  
Three Phase ◽  
High Efficient ◽  
Wound Rotor Synchronous Machine ◽  
Field Excitation

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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