Relationship Between Homopolar Inductor Machine and Wound-Field Synchronous Machine

Ye, Caiyong; Yang, Jiangtao; Xiong, Fei; Zhu, Z. Q.

doi:10.1109/tie.2019.2898577

Cited by 40 publications

(21 citation statements)

References 28 publications

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“…Radialflux and transverse-flux homopolar induction machines have drawn much attention during the past two decades considering their low-standby-loss nature and the ease of integrating the electric machine rotor with the flywheel [30]- [32]. However, the torque/power density of this type is relatively low compared with induction machines and PM brushless machines [33]. Other machines, such as synchronous reluctance machines, and bearingless versions of PM brushless machines and induction machines have also been proposed, yet experimental demonstrations of the feasibility are still rare.…”

Section: Electric Machines For Fess a Machine Topologiesmentioning

confidence: 99%

Overview of Flywheel Systems for Renewable Energy Storage with a Design Study for High-speed Axial-flux Permanent-magnet Machines

Kesgin

Han

Taran

et al. 2019

2019 8th International Conference on Renewable Energy Research and Applications (ICRERA)

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Flywheel energy storage is considered in this paper for grid integration of renewable energy sources due to its inherent advantages of fast response, long cycle life and flexibility in providing ancillary services to the grid, such as frequency regulation, voltage support, etc. The fundamentals of the technology and recent developments are reviewed, firstly with an emphasis on the design considerations and performance metrics. Then the progress and development trends in electric motor/generators employed in flywheel energy storage systems (FESS) are summarized, showing the potential of axial-flux permanent-magnet (AFPM) machines in such applications. Design examples of high-speed AFPM machines are provided and evaluated in terms of specific power, efficiency, and open-circuit losses in order to validate their suitability in FESS.

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Section: Electric Machines For Fess a Machine Topologiesmentioning

confidence: 99%

Overview of Flywheel Systems for Renewable Energy Storage with a Design Study for High-speed Axial-flux Permanent-magnet Machines

Kesgin

Han

Taran

et al. 2019

2019 8th International Conference on Renewable Energy Research and Applications (ICRERA)

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“…The main advantage of the SHM is its simple and reliable construction with its brushless excitation located at the stator of the machine together with armature winding. SHMs are utilized as generators in traction applications [1], aircrafts and trains [2], welding inverters [3], [4], etc. Their use has been considered in kinetic energy storage systems [5] due to their ability to regulate flux.…”

Section: Introductionmentioning

confidence: 99%

“…In some parts of the motor, flux flows in the axial direction, while in other parts, it flows in the transverse plane and changes its direction to the axial one when coming from laminated parts to the stator back iron or the magnetic sleeve on the rotor shaft. Therefore, the finite element model (FEM) in 3D was used to compute the operation points of these motors [1], [11], [12].…”

Section: Introductionmentioning

confidence: 99%

“…However, no verification of the model and no computation time estimation were introduced. The SHM and wound rotor synchronous machine were compared in a low VOLUME XX, 2017 power generation application in [1] using 3D FEM. Here, experimental validation was performed.…”

Section: Introductionmentioning

confidence: 99%

“…The virtual excitation coils were added to each rotor teeth in [1] and [13] in order to represent excitation flux in a 2D model. In the axial direction, the magnetic system was evaluated using analytical equations for the lumped parameters network.…”

Section: Introductionmentioning

confidence: 99%

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Traction Synchronous Homopolar Motor: Simplified Computation Technique and Experimental Validation

et al. 2020

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The synchronous homopolar motor (SHM) has been attracting the attention of researchers for many decades. Various mathematical models of SHM have been proposed to deal with its complicated magnetic circuit. Among them, there are time-consuming 3D finite element models (FEM), equivalent circuit models neglecting some significant features of the machine design, and 2D FEM models with virtual excitation winding distorting magnetic field picture. This paper proposes a novel 2D FEM of SHM and shows that since there are no sources of excitation in the cross-sections of the rotor and stator stacks, no virtual elements are required. This model uses the general solution of the Gauss's law for magnetism containing excitation flux. The model is based on a set of magnetostatic boundary value problems for various rotor positions. The set of boundary problems is completed with the excitation equivalent circuit. The losses in the armature and field windings and in the stator and rotor magnetic cores are computed in postprocessing. All these computations are carried out for a single combination of stator and rotor stack. A symmetrization algorithm is proposed to extend the obtained results to the whole SHM. A comparison of the theoretical and experimental data for a nine-phase three-section 320 kW SHM is carried out. These SHMs were used in a mining truck with a carrying capacity of 90 tons. INDEX TERMS AC machines, automotive applications, brushless motors, electric vehicles, electromagnetic modeling, mining industry, traction motor.

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RETRACTED: Investigation of A Two‐Dimensional Model for Cogging Torque Calculation in Homopolar Inductor Machines

Wang

Liu

2023

IEEJ Transactions Elec Engng

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Because the magnetic circuits of homopolar inductor machines (HIMs) are three‐dimensional (3‐D), a 3‐D finite element model (FEM) is usually built to accurately compute the cogging torque in HIMs, but the drawback is very time‐consuming in modeling and computing. Therefore, a two‐dimensional (2‐D) FEM of HIMs is needed to simplify the computation of the 3‐D FEM. However, the existing odd harmonic 2‐D FEM cannot accurately predict the cogging torque in HIMs. To address this problem, this paper proposes a full‐order harmonic 2‐D FEM. First, the analytical expressions of HIM cogging torque are derived by the combination of energy method and air‐gap field modulation principle. Based on the obtained analytical expressions, the equivalent principles between the 3‐D and 2‐D FEMs are analyzed. According to the above equivalent principles and taking a 48‐slot/4‐tooth (48S4T) permanent magnet (PM) HIM as an example, a full‐order harmonic 2‐D FEM of the example machine excited by a field winding is proposed. The structure of the full‐order harmonic 2‐D FEM is described in detail. The turn number of field winding and field current amplitude of the proposed 2‐D FEM are investigated. The differences between the odd harmonic 2‐D and full‐order harmonic 2‐D FEMs are also analyzed. Finally, the cogging torque in the 48S4T PM HIM with distinct rotor tooth‐arc to tooth‐pitch ratios is computed by 3‐D, odd harmonic 2‐D and full‐order harmonic 2‐D FEMs of the machine, respectively. The results illustrate that compared with the odd harmonic 2‐D FEM, the full‐order harmonic 2‐D FEM can shorten the calculation time and has the similar computation accuracy as the 3‐D FEM. Moreover, the experimental validation is performed on a prototype of the 48S4T PM HIM. The error between the maximum cogging torque obtained by the full‐order harmonic 2‐D FEM and experiments is only 2.12%. © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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Relationship Between Homopolar Inductor Machine and Wound-Field Synchronous Machine

Abstract: This is a repository copy of Relationship between homopolar inductor machine and wound-field synchronous machine.

Cited by 40 publications

References 28 publications

Overview of Flywheel Systems for Renewable Energy Storage with a Design Study for High-speed Axial-flux Permanent-magnet Machines

Overview of Flywheel Systems for Renewable Energy Storage with a Design Study for High-speed Axial-flux Permanent-magnet Machines

Traction Synchronous Homopolar Motor: Simplified Computation Technique and Experimental Validation

RETRACTED: Investigation of A Two‐Dimensional Model for Cogging Torque Calculation in Homopolar Inductor Machines

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