Determination of rotor-stator heat exchange coefficients in the case of totally enclosed machines: Application to an integrated starter-generator

Friedrich, Guy; Vivier, Stéphane; Khlissa, Radhouane; Benkara, Khadija El Kadri; Assaad, Bassel

doi:10.1109/ecce.2013.6646886

Cited by 4 publications

(5 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, all temperature measurements in the rotating parts are carried out when the motor is stopped. Based on the experimental study performed by Friedrich et al [9], the rotor temperature is gotten approximately 5 min after the motor stoppage. Measurements of the torque, the rotation speed, the current and the voltage are experimentally performed.…”

Section: B Description Of the Experimental Proceduresmentioning

confidence: 99%

“…1. Schematic of the Integrated Starter Generator (ISG) [9] this paper aims mainly at proposing a numerical model based on CFD methods for the estimation of heat transfer coefficients in a rotor-stator system. More precisely, it presents a numerical approach for understanding and assessing heat transfer and flow dynamics inside air gaps of electric motors.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, an accurate knowledge of the temperature distribution as well as the characterization of the heat transfer seems mandatory for an optimal design of Permanent Magnet Synchronous Machines (PMSM). In the literature, numerous studies have deployed the Lumped Parameters Thermal Network (LPTN) method for analyzing the thermal behavior of electric machines [1], [6], [9], [17]. This approach is increasingly used for the thermal design of electric motors because of its low computational cost, relative accuracy and ability to estimate properly temperatures in solid parts (heat transfer by conduction).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical approach for thermal analysis of heat transfer into a very narrow air gap of a totally enclosed permanent magnet integrated starter generator

Nachouane

Abdelli

Friedrich

et al. 2015

2015 IEEE Energy Conversion Congress and Exposition (ECCE)

Self Cite

View full text Add to dashboard Cite

This paper proposes a detailed numerical model of a very narrow air gap of a permanent magnet synchronous machine without an imposed axial flow. The flow structure analysis and the convective heat transfer are carefully investigated using an axisymmetric model of two concentric cylinders where the inner cylinder is rotating and the outer cylinder is stationary. For the different cases, only isothermal boundary conditions have been considered. The impact of the air gap mean temperature and of the rotation speed are thoroughly studied and all numerical findings are compared with analytical dimensionless correlations. CFD simulations show the existence of two critical Taylor numbers corresponding to the onset of further instabilities into the air gap which matches with theoretical and experimental previous results found in the literature. The Nusselt number distribution given by CFD shows a disparity with the dimensionless correlations which underestimate the effective convective heat transfer in very narrow air gaps. The numerical simulations allow the definition of a piecewise expression able to fit well the overall Nusselt number distribution over a relatively large range of Taylor numbers up to 3×10 4 . The present work shows the contribution of CFD numerical methods on the estimation of convection thermal resistances in very narrow air gaps.

show abstract

Section: B Description Of the Experimental Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical approach for thermal analysis of heat transfer into a very narrow air gap of a totally enclosed permanent magnet integrated starter generator

Nachouane

Abdelli

Friedrich

et al. 2015

2015 IEEE Energy Conversion Congress and Exposition (ECCE)

Self Cite

View full text Add to dashboard Cite

show abstract

“…For radial flux machines, the air gap flow is related to the study of Taylor vortices. Recirculation and instability of the flows within the air gap contribute to the formation of the Taylor vortices that have an effect on the temperature [24]- [27]. However, the Taylor vortices rely on the rotating speed of the rotor.…”

Section: B Rotormentioning

confidence: 99%

Impact of the Fan Design and Rotational Direction on the Thermal Characteristics of Induction Motors

Goh¹,

Fawzal

Gyftakis³

et al. 2018

2018 XIII International Conference on Electrical Machines (ICEM)

View full text Add to dashboard Cite

show abstract

“…These results provided references for the structural design of a large turbo-generator rotor and theoretical evidence for the fields of generator operation [13][14][15]. Moreover, there are many studies that apply negativesequence current, eddy loss or negative-sequence capability to the related research on large generators [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Improvement of the transient negative-sequence rating formula for large generators based on the negative-sequence current component

Guo

et al. 2015

Int. Trans. Electr. Energ. Syst.

View full text Add to dashboard Cite

Summary This paper proposes an improved transient negative‐sequence calculation formula for a large‐capacity nuclear power generator system under unbalanced network conditions. Because of the disadvantages of traditional transient negative‐sequence ratings, I2*2 t is concluded to be inadequate for rating the generator imbalance capability. In fact, many factors, such as the possible fault asymmetry, the duration of the fault and non‐periodic components, should also be considered when rating a generator. According to the inherent relation between rotor heating and generator imbalance capability, the non‐periodic component is added to the improved transient negative‐sequence formula. In this paper, an AP1000 nuclear turbo‐generator was examined as a model to systematically analyse the electromagnetic properties and generator transient negative‐sequence capability affected by different types of typical short circuits. A comprehensive comparison based on accident examples, experimental results and extensive simulations shows that the improved transient negative‐sequence formula not only significantly enhances the assessment accuracy of large‐capacity generator imbalance capability but also provides a theoretical reference for the related research of large‐capacity generator systems. Copyright © 2015 John Wiley & Sons, Ltd.

show abstract

Determination of rotor-stator heat exchange coefficients in the case of totally enclosed machines: Application to an integrated starter-generator

Cited by 4 publications

References 12 publications

Numerical approach for thermal analysis of heat transfer into a very narrow air gap of a totally enclosed permanent magnet integrated starter generator

Numerical approach for thermal analysis of heat transfer into a very narrow air gap of a totally enclosed permanent magnet integrated starter generator

Impact of the Fan Design and Rotational Direction on the Thermal Characteristics of Induction Motors

Improvement of the transient negative-sequence rating formula for large generators based on the negative-sequence current component

Contact Info

Product

Resources

About