A New Small-Scale Self-Excited Wound Rotor Synchronous Motor Topology

“…In this type of excitation system, the rotor field winding is connected to a capacitor through a four-switch converter to extract and regulate the required field current for excitation. However, all of the aforementioned machine systems for brushless excitation require more electronic components than the conventional machines, which are expensive and bring new problems [13,14]. In [13], the de-excitation system was investigated for large hydro-generators.…”

Section: Introductionmentioning

confidence: 99%

“…However, all of the aforementioned machine systems for brushless excitation require more electronic components than the conventional machines, which are expensive and bring new problems [13,14]. In [13], the de-excitation system was investigated for large hydro-generators. In [14], the field current estimation method has been investigated for a brushless wound rotor synchronous starter-generator with asynchronous brushless exciters.…”

Section: Introductionmentioning

confidence: 99%

Cost-Effective Scheme for a Brushless Wound Rotor Synchronous Machine

Sirewal

Bukhari

2021

WEVJ

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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.

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“…Owing to the increasing use of rare‐earth permanent magnet (PM) materials, the challenges related to the brushes and slip rings in medium‐ and small‐scale electrical machines have been resolved by implementing brushless excitation systems using harmonics 1‐2 . In Reference 3, the problem of brushed excitation has been addressed by integrating a wound rotor synchronous machine (WRSM) in an inverted configuration to feed a direct current (DC) load.…”

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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A New Small-Scale Self-Excited Wound Rotor Synchronous Motor Topology

Cited by 21 publications

References 16 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

Cost-Effective Scheme for a Brushless Wound Rotor Synchronous Machine

Brushless field‐excitation method for wound‐rotor synchronous machines

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