Self-Excited Synchronous Machine Using Airgap Harmonics

Lin, Chenjie; Pathmanathan, Mehanathan; Rodriguez, Pedro; Bertoldi, Federico; Kabir, Ashfanoor; Janhunen, Tuomas; Paloheimo, Pasi

doi:10.1109/tie.2020.3008375

Cited by 10 publications

(3 citation statements)

References 18 publications

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“…[31] used the fifth spatial harmonic component for the transformer action. In [32], airgap slot harmonics are used to excite the rotor coils. However, as they are produced by the same currents, the magnitude of these rotating waves are dependent upon one another.…”

Section: Literature Review On Related Work and State Of The Artmentioning

confidence: 99%

Brushless Self-Excited Synchronous Field-Winding Machine With Five- and Higher-Phase Design Using Independently Controlled Spatial Harmonics

Chung

Hofmann

2024

IEEE Trans. Energy Convers.

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Electric machines used in a variety of sustainable energy applications need to possess high power density, high efficiency, and low manufacturing cost. While permanent-magnet machines and synchronous field-winding machines are the popular option for variable-speed drives, these topologies have undesirable aspects. The magnets in permanent-magnet machines are typically made of rare-earth materials which have high price volatility and are prone to demagnetization, risking machine operation. The synchronous field-winding machines require additional electrical and mechanical components requiring regular maintenance and replacement and add extra volume, weight, and cost to the drive system.In this dissertation, a novel brushless self-excitation scheme for synchronous field-winding machines is presented. This scheme uses an AC stator with five or higher phases to create two independently controlled rotating magnetic fields at different spatial harmonics, allowing independent magnetic coupling with different rotor windings. The rotor of the proposed machine possesses a field winding, transformer windings, and a diode rectifier that converts induced AC voltages in the transformer windings into a DC voltage for the field winding. A design for a five-phase stator configuration is developed using finite-element analysis tools, and simulation results are presented. Torque and power characteristics of the design are compared with similarly-sized interior permanent-magnet and induction machines.xi

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Section: Literature Review On Related Work and State Of The Artmentioning

confidence: 99%

Brushless Self-Excited Synchronous Field-Winding Machine With Five- and Higher-Phase Design Using Independently Controlled Spatial Harmonics

Chung

Hofmann

2024

IEEE Trans. Energy Convers.

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“…Observing (12), it is possible to recognise that it also represents the second natural frequency on the entire winding, so that f 1;a = 2 ¼ f 2;a . The natural frequencies (11) and ( 12) can be easily estimated because, at the resonance, the voltage distribution V x shows its antinode close to a/2 and a/4 respectively, i.e.…”

Section: Procedures For Detecting the Resonance Frequencies Of The Winding By Using Standing Wavesmentioning

confidence: 99%

“…The embedded ESs represent no exception to the IGBT application trend for WFSM [11, 12], where the switches are mainly used in the DC/DC converter for the field current regulation.…”

Section: Introductionmentioning

confidence: 99%

An experimentally determined field winding model with frequency‐dependent parameters

Felicetti

Abrahamsson

Lundin

2021

IET Electric Power Appl

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Herein, a set of experimental procedures is presented for determining the main electrical distributed parameters of the field winding in salient pole synchronous machines. It applies to the electrical characterisation of iron‐core power inductors and transformer windings as well, in a range of frequency useful for power electronics applications. A first estimation of the parameters is obtained by forcing the winding into resonance with capacitors of known capacitance. The obtained estimates are then refined through an iterative process, which makes use of the winding natural frequencies. The presented procedures are applied step‐by‐step to the field winding of a 60‐kVA salient pole synchronous generator with solid poles. The distributed parameters model, featured using the outlined procedures, accurately reproduces the winding voltage distribution in a large range of frequency. Finally, it is explored how the interaction between armature and rotor influences the field winding parameters, pointing to the differences of measuring them with the rotor inside or outside the machine bore.

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