A systematic experimental approach in deriving stator-winding heat transfer

Wróbel, Rafał; Ayat, Sabrina; Godbehere, Jonathan

doi:10.1109/iemdc.2017.8001871

Cited by 12 publications

(9 citation statements)

References 20 publications

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“…The experimentally derived thermal conductance has been found to be very useful in accelerating the thermal design of electrical machines, where more complex subassemblies like impregnated windings or the HE body can be simplified by a functional representation, e.g. appropriate boundary condition [9].…”

Section: Results and Observationsmentioning

confidence: 99%

A metal additively manufactured (MAM) heat exchanger for electric motor thermal control on a high-altitude solar aircraft – Experimental characterisation

Wróbel

Scholes

Hussein

et al. 2020

Thermal Science and Engineering Progress

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Section: Results and Observationsmentioning

confidence: 99%

A metal additively manufactured (MAM) heat exchanger for electric motor thermal control on a high-altitude solar aircraft – Experimental characterisation

Wróbel

Scholes

Hussein

et al. 2020

Thermal Science and Engineering Progress

Self Cite

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“…For instance, the computation of the thermal resistance between stator copper and stator core has to consider a heat path through an agglomerate of multiple materials with different thermal properties, while the thermal resistance between machine housing and the ambient areas comprises both convection and radiation phenomena. The literature reports dc tests that allow the calibration of such parameters [8,10,24,32]. It is interesting to observe that, even though for most of the applications those dc tests represent 'ad hoc' calibrating procedures, for the electric machine analyzed in this paper such supply conditions were also representative of the real machine operations.…”

Section: Lumped-parameters Thermal Models For Pm Synchronous Machinesmentioning

confidence: 98%

“…Sometimes, experimental component modeling on motorette samples is also used to calibrate analytical and numerical electric machine models [3,[8][9][10][11]. This approach unquestionably allows the modeling accuracy to increase, but time and budget for sample realization have to be properly considered.…”

Section: Lumped-parameters Thermal Models For Pm Synchronous Machinesmentioning

confidence: 99%

Lumped-Parameters Thermal Network of PM Synchronous Machines for Automotive Brake-by-Wire Systems

Graffeo

Vaschetto

Miotto³

et al. 2021

Energies

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Thermal analysis represents a key factor in electrical machine design due to the impact of temperature increase on insulation lifetime. In this context, there has been a wide investigation on thermal modeling, particularly for machines used in harsh working conditions. In this perspective, brake-by-wire (BBW) systems represent one of the most challenging applications for electrical machines used for automotive smart actuators. Indeed, electro-actuated braking systems are required to repeatedly operate the electric machine in high overload conditions in order to limit the actuator response time, as well as to enhance gravimetric and volumetric specific performance indexes. Moreover, BBW systems often impose unconventional supply conditions to the electric machine, consisting of dc currents in three-phase windings to keep the rotor fixed during the braking intervals. However, a dc supply leads to uneven temperature distributions in the machine, and simplified thermal models may not accurately represent the temperature variations for the different machine parts. Considering such unconventional supply conditions, this paper initially investigates the applicability of a conventional lumped-parameters thermal network (LPTN) based on symmetry assumptions for the heat paths and suitable for surface-mounted PM synchronous machines used in BBW systems. An extensive test campaign consisting of pulses and load cycle tests representative of the real machine operations was conducted on a prototype equipped with several temperature sensors. The comparison between measurements and predicted average temperatures, together with insights on the unbalanced heat distribution under the dc supply obtained by means of finite element analyses (FEA), paved the way for the proposal of a phase-split LPTN with optimized parameters. The paper also includes a critical analysis of the optimized parameters, proposing a simplified, phase-split lumped-parameters thermal model suitable to predict the temperature variations in the different machine parts for PM synchronous electric machines used in BBW systems.

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“…The thermal network is based on the machine dimensions and principles of thermal exchange [17,18]. One of the unresolved issues of the LPTN approach is the thermal model of the stator winding [16][17][18][19][20]. The first problem is that the area of the winding in the slot contains several materials with orders of magnitude different thermal conductivity values.…”

Section: Introductionmentioning

confidence: 99%

A Complex Study of Stator Tooth-Coil Winding Thermal Models for PM Synchronous Motors Used in Electric Vehicle Applications

et al. 2021

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The operational reliability and high efficiency of modern electrical machines depend on the ability to transfer heat in the construction parts of the machine. Therefore, many authors study various thermal models and work on the development of effective heat dissipation. New insights and methods lead to improved techniques for the thermal design of electrical machines. This paper presents an experimentally validated thermal model of a permanent magnet synchronous motor (PMSM) with an improved slot winding model. It also deals with various approaches to homogenization and equivalent material properties of a tooth-coil winding sub-model. First, an algorithm for building a lumped-parameter thermal network (LPTN) of PMSM is described and its properties and problems are discussed. Subsequently, a sub-model of a slot with a winding based on the finite element method (FEM) is introduced. This sub-model is able to generate different conductor distributions based on probabilistic methods for a specified fill factor. This allows the verification of various homogenization approaches and at the same time it is a tool that automatically calculates thermal resistances for the LPTN.

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A systematic experimental approach in deriving stator-winding heat transfer

Cited by 12 publications

References 20 publications

A metal additively manufactured (MAM) heat exchanger for electric motor thermal control on a high-altitude solar aircraft – Experimental characterisation

A metal additively manufactured (MAM) heat exchanger for electric motor thermal control on a high-altitude solar aircraft – Experimental characterisation

Lumped-Parameters Thermal Network of PM Synchronous Machines for Automotive Brake-by-Wire Systems

A Complex Study of Stator Tooth-Coil Winding Thermal Models for PM Synchronous Motors Used in Electric Vehicle Applications

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