The present study focuses on oil cooling for electric motors. A 40 kW test machine in which oil was introduced at each side of the machine to directly cool the stator coil end-windings was previously implemented. The lumped system analysis is used to model the thermal behavior of this test electric machine. An inverse method is applied to interpret the data obtained by the experimental setup. The inverse method leads to interior convection coefficients that help describe the heat transfer mechanisms.

References

1.
Bertin
,
Y.
,
2006
,
Refroidissement des Machines Tournantes. Études Paramétriques
,
Techniques de l'ingénieur
, D3462 v1, pp.
1
17
.
2.
Staton
,
D.
,
Boglietti
,
A.
, and
Cavagnino
,
A.
,
2005
, “
Solving the More Difficult Aspects of Electric Motor Thermal Analysis in Small and Medium Size Industrial Induction Motors
,”
IEEE Trans. Energy Convers.
,
20
(
3
), pp.
620
628
.
3.
Staton
,
D.-A.
,
Popescu
,
M.
,
Hawkins
,
D.
, and
Boglietti
,
A.
,
2010
, “
Influence of Different End Region Cooling Arrangements on End-Winding Heat Transfer Coefficients in Electrical Machines
,”
Energy Conversion Congress and Exposition
(
ECCE
), Atlanta, GA, Sept. 12–16, pp.
1298
1305
.
4.
Hay
,
N.
,
Lampard
,
D.
,
Pickering
,
S.
, and
Roylance
,
T.-F.
,
1995
, “
Heat Transfer From the Stator End-Windings of a Low-Voltage Concentric-Wound Electric Motor
,”
Seventh International Conference on Electrical Machines and Drives
, Durham, UK, Sept. 11–13, Paper No.
412
.
5.
Ma
,
C.
, and
Zheng
,
Q.
,
1997
, “
Local Heat Transfer and Recovery Factor With Impinging Free-Surface Circular Jets of Transformer Oil
,”
Int. J. Heat Mass Transfer
,
40
(
18
), pp.
4295
4308
.
6.
Zhou
,
D.
, and
Ma
,
C.
,
2006
, “
Radial Heat Transfer Behavior of Impinging Submerged Circular Jets
,”
Int. J. Heat Mass Transfer
,
49
, pp.
1719
1722
.
7.
Pais
,
M.
, and
Chow
,
L.
,
1995
, “
Jet Impingement Cooling in VSCF Generators
,”
SAE
Paper No. 951451.
8.
Sun
,
H.
,
Ma
,
C.
, and
Chen
,
Y.
,
1998
Prandtl Number Dependence of Impingement Heat Transfer With Circular Free-Surface Liquid Jets
,”
Int. J. Heat Mass Transfer
,
41
(
10
), pp.
1360
1363
.
9.
Wadsworth
,
D.
, and
Mudawar
,
I.
,
1992
, “
Enhancement of Single-Phase Heat Transfer and Critical Heat Flux From an Ultra-High-Flux Simulated Microelectronic Heat Source to a Rectangular Impinging Jet of Dielectric Liquid
,”
ASME J. Heat Transfer
,
114
(
3
), pp.
764
768
.
10.
Womac
,
D.
,
Aharoni
,
G.
, and
Incropera
,
F.
,
1993
, “
Correlating Equations for Impingement Cooling of Small Heat Sources With Single Circular Liquid Jets
,”
ASME J. Heat Transfer
,
115
(1), pp.
106
115
.
11.
Kim
,
J.
,
2007
, “
Spray Cooling Heat Transfer: The State of the Art
,”
Int. J. Heat Fluid Flow
,
28
(
4
), pp.
753
767
.
12.
Silk
,
E. A.
,
Kim
,
J.
, and
Kiger
,
K.
,
2006
, “
Spray Cooling of Enhanced Surfaces: Impact of Structured Surface Geometry and Spray Axis Inclination
,”
Int. J. Heat Mass Transfer
,
49
(
25–26
), pp.
4910
4920
.
13.
Oliphant
,
K.
,
Webb
,
B.
, and
McQuay
,
M.
,
1998
, “
An Experimental Comparison of Liquid Jet Array and Spray Impingement Cooling in the Non-Boiling Regime
,”
Exp. Therm. Fluid Sci.
,
18
(
1
), pp.
1
10
.
14.
Karwa
,
N.
,
Kale
,
S.
, and
Subbarao
,
P.
,
2007
, “
Experimental Study of Non-Boiling Heat Transfer From a Horizontal Surface by Water Sprays
,”
Exp. Therm. Fluid Sci.
,
32
(
2
), pp.
571
579
.
15.
Okoro
,
O.
,
2003
, “
Thermal Analysis of an Induction Motor Using MATLAB
,”
Greenwich J. Sci. Technol.
,
4
(
1
), pp. 5–15.
16.
Lindström
,
J.
,
1999
, “
Thermal Model of a Permanent-Magnet for a Hybrid Electric Vehicle
,” Licentiate thesis, Chalmers University of Technology, Göteborg, Sweden.
17.
Fan
,
J.
,
Zhang
,
C.
,
Wang
,
Z.
, and
Dong
,
Y.
,
2010
, “
Thermal Analysis of Permanent Magnet Motor for the Electric Vehicle Application Considering Driving Duty Cycle
,”
IEEE Trans. Magn.
,
46
(
6
), pp. 2493–2496.
18.
Davin
,
T.
,
Pellé
,
J.
,
Harmand
,
S.
, and
Yu
,
R.
,
2015
, “
Experimental Study of Oil Cooling Systems for Electric Motors
,”
Appl. Therm. Eng.
,
75
, pp.
1
13
.
19.
Luke
,
S.
,
2013
,
Essentials of Metaheuristics
, 2nd ed.,
Lulu
, Morrisville, NC.
20.
Beck
,
T.
,
Bieler
,
A.
, and
Thomas
,
N.
,
2012
, “
Numerical Thermal Mathematical Model Correlation to Thermal Balance Test Using Adaptive Particle Swarm Optimization (APSO)
,”
Appl. Therm. Eng.
,
38
, pp.
168
174
.
21.
Bornschlegell
,
A.
,
2012
, “
Etude Aérothermique d'une Machine Synchrone Lente
,” Ph.D. thesis, University of Lille, Villeneuve-d'Ascq, France.
22.
Kreith, F., 1969, “
Convection Heat Transfer in Rotating Systems
,”
Adv. Heat Transfer
,
5
, pp. 129–251.
23.
Owen
,
J.
, and
Rogers
,
M.
,
1989
, “
Flow and Heat Transfer in Rotating Disk Systems
,”
Rotor-Stator Systems
, Vol.
1
.
24.
Pereira
,
R. H.
,
Braga
,
S. L.
, and
Parise
,
J. A. R.
,
2012
, “
Single Phase Cooling of Large Surfaces With Square Arrays of Impinging Water Sprays
,”
Appl. Therm. Eng.
,
36
, pp.
161
170
.
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