Dual-Purpose No-Voltage Winding Design for the Bearingless AC Homopolar and Consequent Pole Motors

Severson, Eric L.; Nilssen, Robert; Undeland, Tore; Mohan, Ned

doi:10.1109/tia.2015.2388852

Cited by 44 publications

(3 citation statements)

References 28 publications

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“…Brushless synchronous homopolar machines (SHMs) with axial excitation flux and stator-fixed concentric coils of the excitation winding are known for their high reliability, due to which they find use in flywheel energy storage and traction motors, as well as in welding automotive and aircraft generators [6][7][8][9]. They can be used at high temperatures and in hazardous environments, such as drives [10] and high-power wind generators [11]. The main benefit of SHMs, in comparison with conventional generators with electrically excited rotor, is high reliability, due to the simple rotor without windings, no sliding contact, and reliable concentric excitation winding coils located on the stator.…”

Section: Introductionmentioning

confidence: 99%

Synchronous Homopolar Generator without Permanent Magnets for Railway Passenger Cars

2023

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The article presents the optimal design of a 35 kW brushless synchronous homopolar generator without permanent magnets for railway passenger cars. The excitation winding of the generator is located on the stator, and the toothed rotor has no windings. The generator characteristics are optimized considering the required constant power speed range. A single-objective Nelder–Mead algorithm and 2D Finite Element Analysis were used for the optimization. As a result of the optimization, power losses are significantly reduced over the entire operating range of the generator rotational speed, the current capacity of the solid-state rectifier, and the torque ripple. A comparison of the calculated characteristics of the generator under consideration with the characteristics of a commercially available undercar generator shows that the active volume is reduced by a factor of 2.1, and the losses are significantly reduced over the entire operating speed range.

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Section: Introductionmentioning

confidence: 99%

Synchronous Homopolar Generator without Permanent Magnets for Railway Passenger Cars

2023

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“…For this reason, researchers have paid much attention to this type of machine. The authors of [9] use a bearingless ac homopolar alternator for a flywheel energy storage system, which avoids significant mechanical friction, increases the motor efficiency and increases the operational lifespan. The authors of [10] use a novel permanent magnet homopolar inductor machine with a mechanical flux modulator for a flywheel energy storage system.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Performance Evaluation of a Novel Adjustable Speed Drive with a Homopolar-Type Rotor

Guo

Liu³

et al. 2022

Mathematics

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The use of a magnetic adjustable speed drive is a popular choice in industrial settings due to its efficient operation, vibration isolation, low maintenance, and overload protection. Most conventional magnetic adjustable speed drives use various forms of the permanent magnets (PMs). Due to the PMs, this type of machine has continuous free-wheeling losses in the form of hysteresis and induced eddy currents. In recent years, the homopolar-type rotor has been widely used in high-speed machines, superconducting machines, and in the application of flywheel energy storage. This study proposes a new application of the homopolar-type rotor. A novel adjustable speed drive with a homopolar-type rotor (HTR-ASD), which has obvious advantages (no brush, no permanent magnet, and no mechanical flux regulation device), is designed and analyzed in this study. Its speed and torque can be adjusted only by adjusting the excitation current. Firstly, in this study, the structure, operation principles, and flux-modulated mechanism of the HTR-ASD are studied. The homopolar-type rotor has a special three-dimensional magnetic circuit structure with the same pole. The 3D-FEM is usually used to calculate its parameters, which is time consuming. In this study, an analytical method is developed to solve this issue. To analytically calculate the torque characteristics, the air gap magnetic flux density, and the winding inductance parameter, the equivalent circuit and the air gap permeance are researched to simplify the analysis. Then, the key parameters of the HTR-ASD are calculated. Finally, the performance of the HTR-ASD is comparatively studied using the analytical method and finite element method, and a comparison of the results is carried out. The comparison indicates that the analytical method is in good agreement with simulation results, and that it is very helpful for designing homopolar-type rotor machines. According to the analysis, the proposed adjustable speed drive displays a great performance in relation to the operating characteristics of a flexible mechanical speed drive.

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“…Moreover, in [6], [7] and [8], SHMs were used as traction motors. They can be utilized in high temperature and hazard environments as drives [9] and as high-power wind generators [10].…”

Section: Introductionmentioning

confidence: 99%

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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Dual-Purpose No-Voltage Winding Design for the Bearingless AC Homopolar and Consequent Pole Motors

Cited by 44 publications

References 28 publications

Synchronous Homopolar Generator without Permanent Magnets for Railway Passenger Cars

Synchronous Homopolar Generator without Permanent Magnets for Railway Passenger Cars

Analysis and Performance Evaluation of a Novel Adjustable Speed Drive with a Homopolar-Type Rotor

Traction Synchronous Homopolar Motor: Simplified Computation Technique and Experimental Validation

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