A novel hybrid flux machine with transverse flux stator and longitudinal flux rotor

Boomiraja, Balaganesh; Ragavan, K

doi:10.1007/s00202-020-00967-y

Cited by 3 publications

(7 citation statements)

References 18 publications

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“…Analytical and FEM results have been compared for a hybrid TFM in [90]: the relative error is lower than 5% for the flux linkage and back-EMF, whereas the error is 12.8% for torque.…”

Section: Finite Element Methodsmentioning

confidence: 99%

“…TFMs potential for vehicle traction has been explored, for example, in hybrid buses [84], ships (200 MW, 200 rpm per shaft, directly-coupled) [83], as an in-wheel motor for electric scooters [6,90,93], bikes [56] and for other in-wheel uses [25,87,88,92]. It has been shown that the efficiencies of a TFM and a RFM are comparable in the low-speed-low-torque operating point, and better for the RFM in the high-speed point and for the TFM in the high-torque point [85].…”

Section: Applicationsmentioning

confidence: 99%

“…However, there is part of the winding that does not contribute to the flux linkage, but causes copper losses and increases the active weight, for this reason it could be treated as an end winding although TFMs do not have an end winding [58], strictly speaking. In [90], a hybrid flux machine is designed, it is named "hybrid" because the magnetic flux in the stator core is transverse, whereas the rotor flux is longitudinal. Its aim is to improve the magnets utilization and power factor, taking advantage of magnetic and electric circuits decoupling and low ohmic losses of TFMs and simple rotor construction, with single magnet layer per stack, and better magnet utilization of longitudinal flux machines.…”

Section: Winding (Ring Pole)mentioning

confidence: 99%

“…Figure 11 depicts the torque-speed and power-speed ratings of some TFMs found in the literature [6,8,67,69,71,72,80,81,90,93,95,104,109,113,116,122,131], both for TF motors and generators. As shown in Figure 11a,b, most of the reported TFMs have their ratings up to 100 Nm and 2 kW: in Figure 11c,d The efficiency is a key aspect of modern electric drives, and it is closely linked to the machine losses: they are formed essentially by copper losses, iron losses, PMs losses, stray load losses and even housing losses (for example, if it is made of aluminum, eddy currents can be induced) [129].…”

Section: Torque Speed and Efficiency Ratingsmentioning

confidence: 99%

“…Magnetic and thermal isotropy [5,98,110] Lower permeability [5,90,98] (typically 500 up to maximum 900 [132]) that contributes to fringing [58] Lower losses at high frequencies [131] (over 300 Hz [110]-600 Hz [129]) due to eddy current losses [5] Higher losses at low frequencies [131] due to hysteresis losses [97] Lower mass density [98] Weak mechanical performance [5,98] Manufacturing cost can be lower with high-volume productions [98,110] Very high cost for prototyping [98] 4.5.2. Permanent Magnets (NdFeB, Ferrite)…”

Section: Pros Consmentioning

confidence: 99%

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A Review of Transverse Flux Machines Topologies and Design

2021

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High torque and power density are unique merits of transverse flux machines (TFMs). TFMs are particularly suitable for use in direct-drive systems, that is, those power systems with no gearbox between the electric machine and the prime mover or load. Variable speed wind turbines and in-wheel traction seem to be great-potential applications for TFMs. Nevertheless, the cogging torque, efficiency, power factor and manufacturing of TFMs should still be improved. In this paper, a comprehensive review of TFMs topologies and design is made, dealing with TFM applications, topologies, operation, design and modeling.

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“…Analytical and FEM results have been compared for a hybrid TFM in [90]: the relative error is lower than 5% for the flux linkage and back-EMF, whereas the error is 12.8% for torque.…”

Section: Finite Element Methodsmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

Section: Winding (Ring Pole)mentioning

confidence: 99%

Section: Torque Speed and Efficiency Ratingsmentioning

confidence: 99%

Section: Pros Consmentioning

confidence: 99%

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A Review of Transverse Flux Machines Topologies and Design

2021

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Design and analysis of semi-closed stator core transverse flux permanent magnet generator

Ali

Khan

Yousuf

et al. 2021

WJE

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Purpose The purpose of this paper is to modernize the generator system of wind turbine concept that not only improves the efficiency and power density but also reduces the system cost making design simpler and less expensive, especially in large-scale production. Design/methodology/approach This paper presents a new permanent magnet transverse flux generator (PMTFG) for wind energy production. The key feature of its composition is the double armature coil in a semi-closed stator core. The main structural difference of the presented design is the use of double coil in the same space of semi-closed stator core and reduced number of stator pole pairs and rotor magnets from 12/24 to 10/20. 3D simulations are performed using finite element analysis (FEA) to measure induced voltage and magnetic field distribution at no load. The FEA is performed to quantify the change in flux linkage, induced voltage and output power as a function of different speeds and load current. Findings Results show that PMTFG with double coil configuration has improved electromagnetic performance in terms of flux linkage, induced voltage, output power and efficiency. The power density of 10/20 PMTFG with the double coil is 0.0524 KW/Kg, about an 18% increase compared to the conventional design. Research limitations/implications The proposed PMTFG is highly recommended for direct drive applications such as wind power. Originality/value Four models are simulated by FEA with single and double coil configuration, and load analysis is performed on all simulated models. Finally, results are compared with conventional PMTFG.

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A Comprehensive Analytical Sizing Methodology for Transverse and Radial Flux Machines

Ballestín-Bernad,

Egea-Cáceres,

Artal-Sevil

et al. 2023

IEEE Access

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Transverse flux machines have the potential to offer high torque density in direct-drive vehicle traction applications. Besides, sizing equations are a wide-spread technique for transverse flux machines design, as their computational cost is much lower than the finite element method. In this paper a novel analytical sizing methodology for transverse and radial flux machines is presented, focusing on the current load and the pole length factor as the main design parameters. The motor specifications are intended for a light-duty electric vehicle application. As transverse flux machines have a single, hoop-shaped coil per phase that embraces the flux of all the pole pairs, their principle of operation and therefore their sizing equations differ from radial flux machines. The proposed analytical method allows to compare transverse and radial flux machines easily through a similarity analysis and a parametric study. Furthermore, the discrepancies between the analytical model and the finite element method are quantified and then included in previous equations. Then the analytical model is optimized with a multiobjective genetic algorithm in the final stage. According to the sizing methodology presented here, transverse flux machines have a superior performance than radial flux machines in terms of torque density and efficiency.

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A novel hybrid flux machine with transverse flux stator and longitudinal flux rotor

Cited by 3 publications

References 18 publications

A Review of Transverse Flux Machines Topologies and Design

A Review of Transverse Flux Machines Topologies and Design

Design and analysis of semi-closed stator core transverse flux permanent magnet generator

A Comprehensive Analytical Sizing Methodology for Transverse and Radial Flux Machines

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