Thermal Design of Linear Induction and Synchronous Motors for Electromagnetic Launch of Civil Aircraft

Bertola, Luca; Cox, Tom; Wheeler, Patrick; Garvey, Seamus D.; Morvan, Hervé

doi:10.1109/tps.2017.2697941

Cited by 12 publications

(5 citation statements)

References 7 publications

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“…As the laminated structure is used in AFPMSMs for eddy current reduction, the principle of eddy current at the core is presented in this section. The eddy current loss is affected by the total length of the eddy current loop, as shown in Equation (1) where Pe is the eddy current loss, k is the conductivity, t is the thickness of the conductor passing through, f is the frequency, and Bm is the maximum magnetic flux density. As described in Equation ( 1), the eddy current loss is proportional to the square of the thickness of the conductor.…”

Section: Principle Of Eddy Current Lossmentioning

confidence: 99%

“…Most AC machine drive systems applied to aircraft, automotive, and industry are built with permanent magnet and induction machines. Induction motors (IM) have been widely used in industry and propulsion systems applied in aircrafts [1][2][3]. It has also been indicated that a water pump, considered a heart part of the irrigation system, has been built with IM.…”

Section: Introductionmentioning

confidence: 99%

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Eddy Current Loss Reduction in Axial-Flux Motors Using 3D Printing

et al. 2023

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As more electrification and emission-free transportation trends receive more attention, electrical systems applied in the aircraft and automotive industries are changing from fossil fuel and hydraulic systems to electric AC machine drive systems. Three-dimensional printing technology has been contributing to a new design of machines, because it provides many opportunities without limitation compared to the conventional manufacturing system. Although 3D printing technology opened a door for increasing the efficiency and power density of AC machine drives with low conduction loss, an optimal design process for eddy current loss reduction is required, because eddy current loss is affected by the design structure of the machine. The slit structure at the stator shoe is proposed to reduce eddy current loss. With the three variables, the number of slits, the thickness of slits, and the length of ribs, a parametric analysis was conducted to find an optimal design with eddy current loss reduction without a significant performance dip. The optimal design provides an 18.75% decrease in eddy current loss.

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Section: Principle Of Eddy Current Lossmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Eddy Current Loss Reduction in Axial-Flux Motors Using 3D Printing

et al. 2023

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“…Analytical methods allow a very fast computation of working temperatures [1,3,4,15,16], so they are the way to go if iterative optimization methods are employed. As a reference, Bertola et al [20], computed the transient thermal behavior of a linear permanent-magnet machine and a linear induction machine for electromagnetic launch systems. The computation was based on simple formulations, which allowed the authors to evaluate the temperature rise of the machines under different current density values.…”

Section: Introductionmentioning

confidence: 99%

Development of a Thermal Analysis Tool for Linear Machines

et al. 2021

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The thermal design is one of the most important stages in the design process of electrical machines. Thanks to software packages, like Motor-CAD, rotating machine designers can predict the thermal operation of the machines with high precision. However, a Motor-CAD equivalent for linear machines does not exist. Thus, linear machine designers must develop specific thermal analysis tools when designing the machines. In this article, a generic thermal analysis tool for different kinds of linear machines is presented. The model has been designed in MATLAB Simulink. Hence, it should be easy to implement for most engineers. The article describes the configuration of the different elements of the tool. The calibration parameters and procedure, and typical values of the calibration variables, are also given in the document. Finally, in order to demonstrate the generic nature of the tool, the model is experimentally validated via DC thermal tests to a linear induction machine and a linear switched-flux permanent magnet machine. The results show that, despite being simple and easy to implement, the model can predict the thermal operation of different machines with high precision.

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“…In precision manufacturing, there are stricter demands for linear motors, such as those regarding thrust density and thrust fluctuation. Besides structural improvements, increasing the armature density of the motor is the most effective way to increase the thrust density [1][2][3][4][5]. However, the temperature rise that is caused by the excessive electrical density is also an unacceptable problem in the precision field [6,7].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Suppression of the Eddy Current Damping Force of the Cooling Plate of a Permanent Magnet Linear Motor

Wang¹,

Sun²,

Kang³

et al. 2021

Symmetry

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This paper proposes a new symmetrical cooling plate. It can significantly reduce the eddy current damping force of the water-cooled metal plate. To increase the thrust density of coreless permanent magnet linear motors, cooling plates must be placed on the armature surface to reduce the temperature rise that is caused by high electrical density. However, when the motor moves at a high speed, extra damping force will be generated in the cooling plate, which affects the thrust quality and precision of the permanent magnet linear motor. In this study, we elaborate the mechanism of damping force generation in the cooling plate and propose a new symmetrical cooling plate with low damping force. This paper introduces the topology of a linear motor cooling system and presents an analytical model of the eddy current distribution of a water-cooled plate. The surface current equivalence method is used to calculate the magnitude of the damping force. A new, symmetrical water-cooled plate design method is proposed. This method uses the eddy current vector synthesis principle to cancel the eddy currents that are generated in each region, and to reduce the damping force that is generated in the cooling plate during motor motion. Finally, a 3D simulation model of the motor system is established and an experimental platform is built. The correctness of the analytical model and the effectiveness of the cooling plate design are verified using a simulation and an experiment.

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Thermal Design of Linear Induction and Synchronous Motors for Electromagnetic Launch of Civil Aircraft

Cited by 12 publications

References 7 publications

Eddy Current Loss Reduction in Axial-Flux Motors Using 3D Printing

Eddy Current Loss Reduction in Axial-Flux Motors Using 3D Printing

Development of a Thermal Analysis Tool for Linear Machines

Analysis and Suppression of the Eddy Current Damping Force of the Cooling Plate of a Permanent Magnet Linear Motor

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