Transverse flux machines as an alternative to radial flux machines in an in‐wheel motor

Martinez-Ocaña, Iago; Baker, Nick; Mecrow, B.C.; Hilton, Christopher; Brockway, Simon

doi:10.1049/joe.2018.8184

Cited by 13 publications

(21 citation statements)

References 19 publications

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“…When the efficiencies of radial, axial, and 3-phase conventional TFM machines were compared, higher efficiency was calculated in the TFM than in the axial machine [3]. However, in another comparison of claw-pole TFM, modulating-pole TFM, and the radial flux machine, the efficiencies of the TFMs were calculated in the range of 60%-70% [6]. This contrast reveals that the machine torque density should also be taken into account during efficiency analysis.…”

Section: Efficiency and Torque Density Of Tfmsmentioning

confidence: 93%

“…Therefore, the power factors need to be improved in order for TFMs to compete with traditional PM machines. The power factor can be enhanced by optimizing the number of poles and magnet dimensions [6,21,[37][38][39][40]. As the number of poles increases, the distance between the poles decreases; therefore, the leakage between the poles increases [21].…”

Section: Power Factor Of Tfmsmentioning

confidence: 99%

“…It was seen that copper losses of TFMs were generally low, and also some of the TFM topologies performed better than radial flux machine in terms of power density and cost. Another comparison was made between two different TFMs and radial flux machine for the in-wheel application [6]. Although copper losses are similar to the reference radial machine, it has been concluded that "the efficiency of the TFMs due to iron losses and the power factors are low due to leakage flux".…”

Section: Introductionmentioning

confidence: 99%

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Comparative review of disk type and unconventional transverse flux machines: performance analysis

Tuncel¹,

Yıldırız²

2021

Turk J Elec Eng & Comp Sci

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Transverse flux machines (TFM) can be designed with high pole numbers, so they are very useful in directdrive systems with high torque density. Although many TFM models have been proposed to date, no detailed classification and comparison has been made before. Conventional TFMs have a high power and torque density, but low power factors and high cogging torques have prevented them from being widely used. However, especially with the new disk type TFMs proposed in recent years and the methods developed, these drawbacks have been reduced. In this paper, the TFMs proposed in recent years have been classified and their performances in terms of power factor, cogging torque, torque density, and efficiency have been examined. According to the results of this review, the performances of the new generation TFMs are competitive. Especially double-sided disk type TFMs are seen as an important topology with their high magnet utilization and flexibility in design.

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Section: Efficiency and Torque Density Of Tfmsmentioning

confidence: 93%

Section: Power Factor Of Tfmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative review of disk type and unconventional transverse flux machines: performance analysis

Tuncel¹,

Yıldırız²

2021

Turk J Elec Eng & Comp Sci

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“…In addition, iron loss is likely to be high. Hence, TFMs are generally thought to be suitable for low-speed high torque applications [7] and they have been proposed in automotive, marine, buses, and renewable energy applications [8][9][10]16].…”

Section: Modular Transverse Flux Machines Fabricated From Soft Magnetic Compositesmentioning

confidence: 99%

Manufacturing Challenges of a Modular Transverse Flux Alternator for Aerospace

2020

Self Cite

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This paper presents the manufacturing challenges of a transverse flux alternator for an aerospace application. For fault tolerance, four independent isolated phases are required to deliver a specific power at low speeds, whilst at over speed, there is a strict limit on the short circuit current. A transverse flux machine (TFM) was selected due to its high inductance combined with the modular nature of separate phases lending itself to fault tolerance. The stator consists of pressed soft magnetic composite (SMC) segments. The authors explore the electromagnetic, mechanical, and assembly design challenges of the machine. It is shown that mechanical design aspects of the segments are of equal importance to the electromagnetic design and optimization. Simple design choices have allowed the same component to be used as all the stator segments, despite the requirement of a 90° electrical phase difference between phases and a tooth offset of 180° electrical within each phase.

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“…The LSM is a surface‐mounted PM machine, which is a conceptually simple topology, analogous to the surface‐mounted rotary synchronous PM machine, known for high overload torque density and relatively straightforward construction. The TFM, on the other hand, in its rotary form requires unconventional construction [5], is known for effective use of PM material, has good rated performance but is less good in extreme overload conditions [6].…”

Section: Linear Machinesmentioning

confidence: 99%

Experimental comparison of two linear machines developed for the free piston engine

Baker

Jala

Wang

et al. 2019

J. eng.

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Transverse flux machines as an alternative to radial flux machines in an in‐wheel motor

Cited by 13 publications

References 19 publications

Comparative review of disk type and unconventional transverse flux machines: performance analysis

Comparative review of disk type and unconventional transverse flux machines: performance analysis

Manufacturing Challenges of a Modular Transverse Flux Alternator for Aerospace

Experimental comparison of two linear machines developed for the free piston engine

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