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.

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 Cost-Effective Scheme for a Brushless Wound Rotor Synchronous Machine

2021 ◽  
Vol 12 (4) ◽  
pp. 194
Author(s):  
Ghulam Jawad Sirewal ◽  
Syed Sabir Hussain Bukhari
Keyword(s):  
Cost Effective ◽  
Synchronous Machine ◽  
Element Analysis ◽  
Slip Ring ◽  
Three Phase ◽  
Wound Rotor Synchronous Machine ◽  
Bridge Rectifier ◽  
Brushless Excitation ◽  
Current Flows ◽  
Pole Configuration

This paper proposes a new scheme for a brushless wound rotor synchronous machine (WRSM) by generating an additional, two-pole component of magneto-motive force (MMF) with a series-connected additional three-phase winding with the armature three-phase winding. Unlike existing brushless excitation schemes, which use the inverter to inject harmonic currents in the stator windings, the proposed scheme uses series-connected additional winding on the stator with the armature winding in a two-pole configuration. Consequently, as the current flows in the armature winding, it creates a fundamental rotating air gap flux to interact with the field flux. At the same time, additional rotating flux is created from the additional three-phase winding, which cannot synchronize with the field winding. This additional flux can cause the induction of a voltage in a winding with exactly the same number of poles. For this purpose, a harmonic winding is installed in the rotor along with the field winding connected through a diode bridge rectifier, in order to feed the direct current (DC) to the field winding for rotor excitation without an input current from the brush-slip-ring assembly. The 2D finite-element analysis (FEA) was performed to validate the brushless operation of the proposed machine system.

scholarly journals Dual-Inverter-Controlled Brushless Operation of Wound Rotor Synchronous Machines Based on an Open-Winding Pattern

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2205 ◽  
Author(s):  
Syed Sabir Hussain Bukhari ◽  
Ghulam Jawad Sirewal ◽  
Faheem Akhtar Chachar ◽  
Jong-Suk Ro
Keyword(s):  
Harmonic Component ◽  
Current Component ◽  
Harmonic Current ◽  
Element Analysis ◽  
Third Harmonic ◽  
Time Harmonic ◽  
Wound Rotor Synchronous Machine ◽  
Field Excitation ◽  
Winding Machine ◽  
Dc Current

In an open-winding machine, three-phase stator currents can be controlled such that the input armature currents may contain the third-harmonic current component in addition to the fundamental. Considering this attribute of open-winding patterns, a harmonic current field excitation technique for a wound rotor synchronous machine (WRSM) is proposed in this paper based on the control of time-harmonic magneto-motive force. Two inverters connected to both terminals of the stator winding are controlled so that the input armature current generates an additional third-harmonic current component. This third-harmonic component generates a vibrating magnetic field that induces a current in the specially designed rotor harmonic winding. The current is supplied as DC current to the rotor excitation winding to generate a rotor field by using a full-bridge diode rectifier in order to achieve brushless operation. The proposed dual-inverter-controlled brushless operation for a WRSM is executed in ANSYS Maxwell using 2-D finite element analysis to validate its operation and electromagnetic performance.

scholarly journals Optimal Design of a Novel Three-Phase High-Speed Flux Reversal Machine

2019 ◽  
Vol 9 (18) ◽  
pp. 3822 ◽  
Author(s):  
Vladimir Prakht ◽  
Vladimir Dmitrievskii ◽  
Vadim Kazakbaev ◽  
Safarbek Oshurbekov ◽  
Mohamed N. Ibrahim
Keyword(s):  
High Speed ◽  
Single Phase ◽  
High Efficiency ◽  
Motor Behavior ◽  
Optimization Procedure ◽  
Torque Ripple ◽  
Stator Windings ◽  
Flux Reversal ◽  
Three Phase ◽  
Flux Reversal Machine

A single-phase flux reversal machine (FRM) has many advantages in high-speed applications because of its simple and reliable rotor structure without magnets or winding, simple and cheap concentrated stator windings, high efficiency, and power density. However, the major problem of single-phase motors is the high torque ripple, which shortens their lifetime and causes noise and vibrations, not only in the machine, but also in the mechanisms coupled therewith. This paper presents a novel three-phase machine consisting of three single-phase machines, having a common shaft aiming to reduce the torque ripple and to improve motor behavior. In this paper, the mathematical model of the single-phase flux reversal motor, as well as the conversion procedure of the single-phase motor parameters to the three-phase ones, is considered. Furthermore, an optimization procedure of the motor and choosing the optimization objectives are done. The finite element two-dimensional (2D) method is used to simulate the machine and to show the results.

Sign in / Sign up

Export Citation Format

Share Document