Homopolar generators: An overview

Bianchini, Claudio; Immovilli, Fabio; Bellini, A.; Lorenzani, Emilio; Concari, Carlo; Scolari, Marco

doi:10.1109/ecce.2011.6063962

Cited by 20 publications

(7 citation statements)

References 17 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, traction motors, as well as welding, automotive and aircraft generators [8,9,10]. They can be used at high temperatures and in hazardous environments as drives [11] and as high-power wind generators [12].…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Synchronous Homopolar Generator with Ferrite Magnets for Railway Passenger Cars

Prakht¹,

Dmitrievskii²,

Kazakbaev³

2023

Preprint

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Synchronous homopolar machines (SHM) with excitation winding on the stator have attracted the attention of researchers for many decades due to their high reliability. They are used in a variety of applications such as aircraft and railway generators and traction motors. At the same time, the three-dimensional structure of their magnetic circuit makes the problem of their analysis and optimization challenging. This problem becomes even more complicated when considering an SHM with hybrid excitation, with ferrite magnets in the rotor slots. The article proposes a mathematical procedure for optimizing a synchronous homopolar generator with hybrid excitation based on the single-criterion Nelder-Mead method and two-dimensional finite element analysis (FEA). The use of the Nelder-Mead method compared to multicriteria methods and 2D FEA compared to 3D FEA makes possible to significantly reduce the computational burden. As a result of optimization, the power loss and torque ripples of the generator are significantly reduced. The article also compares the characteristics of synchronous homopolar generators with and without ferrite magnets.

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Section: Introductionmentioning

confidence: 99%

Optimal Design of Synchronous Homopolar Generator with Ferrite Magnets for Railway Passenger Cars

Prakht¹,

Dmitrievskii²,

Kazakbaev³

2023

Preprint

View full text Add to dashboard Cite

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“…Also, since there are no losses in the SHM rotor, no rotor cooling is required. There are many applications of SHMs as high-reliable generators: in passenger railway cars, in ships and aircraft [15,16], in welding units [17], and as automotive generators [18].…”

Section: Introductionmentioning

confidence: 99%

Design Optimization of a Synchronous Homopolar Motor with Ferrite Magnets for Subway Train

2023

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Brushless synchronous homopolar machines (SHM) have long been used as highly reliable motors and generators with an excitation winding on the stator. However, a significant disadvantage that limits their use in traction applications is the reduced specific torque due to the incomplete use of the rotor surface. One possible way to improve the torque density of SHMs is to add inexpensive ferrite magnets in the rotor slots. This paper presents the results of optimizing the performances of an SHM with ferrite magnets for a subway train, considering the timing diagram of train movement. A comparison of its characteristics with an SHM without permanent magnets is also presented. When using the SHM with ferrite magnets, a significant reduction in the dimensions and weight of the motor, as well as power loss, is shown.

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“…Synchronous homopolar machines have been known for a long time and are used in various equipment such as generators in aircrafts and trains [12], welding inverters [13], and flywheel energy storage systems [14]. Moreover, in [4,5,11,15,16], SHMs were presented as traction motors.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization of a Traction Synchronous Homopolar Motor

et al. 2021

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Synchronous homopolar motors (SHMs) have been attracting the attention of researchers for many decades. They are used in a variety of equipment such as aircraft and train generators, welding inverters, and as traction motors. Various mathematical models of SHMs have been proposed to deal with their complicated magnetic circuit. However, mathematical techniques for optimizing SHMs have not yet been proposed. This paper discusses various aspects of the optimal design of traction SHMs, applying the one-criterion unconstrained Nelder–Mead method. The considered motor is intended for use in a mining dump truck with a carrying capacity of 90 tons. The objective function for the SHM optimization was designed to reduce/improve the following main characteristics: total motor power loss, maximum winding current, and torque ripple. One of the difficulties in optimizing SHMs is the three-dimensional structure of their magnetic core, which usually requires the use of a three-dimensional finite element model. However, in this study, an original two-dimensional finite element model of a SHM was used; it allowed the drastic reduction in the computational burden, enabling objective optimization. As a result of optimization, the total losses in the motor decreased by up to 1.16 times and the torque ripple decreased by up to 1.34 times; the maximum armature winding current in the motor mode decreased by 8%.

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Homopolar generators: An overview

Cited by 20 publications

References 17 publications

Optimal Design of Synchronous Homopolar Generator with Ferrite Magnets for Railway Passenger Cars

Optimal Design of Synchronous Homopolar Generator with Ferrite Magnets for Railway Passenger Cars

Design Optimization of a Synchronous Homopolar Motor with Ferrite Magnets for Subway Train

Design Optimization of a Traction Synchronous Homopolar Motor

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