Spatial Harmonics in Multi-Phase Induction Machine

Kindl, Vladimir; Ferková, Želmíra; Cermak, Radek

doi:10.1109/elektro49696.2020.9130322

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…The number of phases in the stator winding design affects an air-gap MMF and its spatial distributions in the machine iron and the overall performance of AC machines. To achieve a good performance of AC machines, a perfect sine wave of the MMF is desired which can only be achieved if the following conditions are satisfied [41].…”

Section: Multi-phase Stator Design and Multiple Spatial Harmonicsmentioning

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: Multi-phase Stator Design and Multiple Spatial Harmonicsmentioning

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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“…In order to reduce harmonics, the number of steps in MMF distribution should be as high as possible. This goal could be met by increasing

q

or (and) chording coils 21–23 …”

Section: Influence Of Slot Per Pole Per Phasementioning

confidence: 99%

Performance improvement of 36‐slot 6‐terminal induction motor drive using pole phase modulation with higher slot per pole per phase

Umredkar¹,

Keshri

Borghate

et al. 2023

Circuit Theory & Apps

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SummaryElectric vehicles (EVs) are getting imperative with passing time due to depleting fossil fuel resources and worsening pollution scenario. Induction motors (IMs) are a promising alternative to the conventional drive systems due to its inherent advantages. However, an efficient geared operation similar to internal combustion engine (ICE) vehicles is essential for wider adoption of the IM drive in EVs. Pole phase modulation technique helps achieve variable speed and torque combinations analogous to geared operation in IM. Performance of the IM drive can be improved by altering the stator winding configuration to achieve high slot per pole per phase, lesser leakage reactance, and lower DC link voltages. A single layered distributed winding is proposed in this work to achieve the above objectives. The proposed winding is first simulated using Maxwell‐2D and Finite Element Analysis (FEA) that are performed to understand the performance characteristics of IM drive with proposed winding scheme. The hardware implementation of the similar setup is done, and the tests are carried out to validate the simulation results. A 3HP, 36‐slot, 6‐terminal IM was fabricated for this purpose which was fed by the microcontroller based 6‐leg inverter for stator winding excitation. This helps to achieve low pole (6‐phase/2‐pole) and high pole (3‐phase/4‐pole) modes of operation to simulate a 2‐geared ICE performance. The study proved that high torque driving requirements can be fulfilled by a low pole operation while cruising requirements are met with a high pole operation. It also showed that the constant power region increases along with the efficiency contours plotted against the torque‐speed characteristics.

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Comparison of AC-Superconducting Multiphase Symmetric-Winding Topologies for Wind Power Generators With PM Rotors

Tome

Nilssen

Nøland

2022

IEEE Trans. Appl. Supercond.

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In this paper, an AC superconducting multi-phase symmetric-winding machine is designed for a wind power generator to improve its performance and reduce losses, where four handpicked topological designs were explored and compared. In particular, it is found that using high-phase order of unique phasors further improves the performance. The iron losses are reduced, and the rippling behavior is lowered due to the smoother airgap magnetic flux density. Furthermore, a higher least-common-multiple (LCM) is achieved due to a better slot-pole combination for fractional-slot concentrated windings without having space sub-harmonics. Nonetheless, it is shown that creating a smooth airgap magnetic flux density does not improve the AC hysteretic superconducting losses; thus, further research is needed using additional approaches. Moreover, it is found that the Meisner effect is present in the machine and is inversely proportional to the AC hysteretic superconducting losses. Finally, the work shows that a 13-phase AC-superconducting machine can achieve a theoretical limit approaching 101.70 Nm/kg for the torque-to-weight ratio, outperforming classic winding layouts.

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Spatial Harmonics in Multi-Phase Induction Machine

Cited by 4 publications

References 7 publications

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

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

Performance improvement of 36‐slot 6‐terminal induction motor drive using pole phase modulation with higher slot per pole per phase

Comparison of AC-Superconducting Multiphase Symmetric-Winding Topologies for Wind Power Generators With PM Rotors

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