Hybrid thermal model of a synchronous reluctance machine

Ghahfarokhi, Payam Shams; Kallaste, Ants; Belahcen, Anouar; Vaimann, Toomas; Rassõlkin, Anton

doi:10.1016/j.csite.2018.05.007

Cited by 19 publications

(15 citation statements)

References 12 publications

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“…Detailed information on the geometrical data of the motor is given in Table 2, and the material properties of the machine are presented in Table 3. The conventional form of conduction thermal resistance is defined as [20]:…”

Section: Computation and Identification Of The Lptn Parametersmentioning

confidence: 99%

“…The distance between the outer surface of the end winding and the internal part of the machine housing is low [20]; accordingly, the airspeed in this region is very low, and the heat exchange from the end winding to the internal part of the housing is assumed as conduction and is calculated as:…”

Section: Conduction Resistance Between the End Windings And The Motormentioning

confidence: 99%

“…Conduction resistance between the end windings and the motor housing (R 7 ) : The distance between the outer surface of the end winding and the internal part of the machine housing is low [20]; accordingly, the airspeed in this region is very low, and the heat exchange from the end winding to the internal part of the housing is assumed as conduction and is calculated as

R_{7} = \frac{\ln ()(, r_{o s} / false(r_{o s} - γ H_{y} false))}{2 π k_{air} ()(, L_{e c} - L_{s})},

where H y is the stator yoke height (m), γ is the reduction coefficient to implement the distance between the outer surface of the end winding and the internal part of the housing and L ec is the motor housing length (m).…”

Section: Computation and Identification Of The Lptn Parametersmentioning

confidence: 99%

“…where l av is the average conductor length of half a turn (m), N s is the number of the stator slots, k cu is the thermal conductivity of the copper (W/m-K), S cu is the total copper conductor cross-section area (m 2 ) Conduction resistance between the end windings and the motor housing (R 7 ): The distance between the outer surface of the end winding and the internal part of the machine housing is low [20]; accordingly, the airspeed in this region is very low, and the heat exchange from the end winding to the internal part of the housing is assumed as conduction and is calculated as…”

Section: Conduction Thermal Resistance From Stator Windings (R 5 and mentioning

confidence: 99%

See 3 more Smart Citations

Development of analytical thermal analysis tool for synchronous reluctance motors

Ghahfarokhi

Kallaste

Podgornovs

et al. 2020

IET Electric Power Applications

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This paper presents the principles of analytical lumped parameter (LP) model for a Synchronous reluctance motor (SynRM) for traction application purposes. Particular focus is put on the calculation of the heat transfer from the machine's housing during the active and passive cooling. For this purpose, the area-based composite correlations method is proposed. The approach is attractive due to its simplicity and the fact that it closely models the temperature of the machine's housing. Finally, the proposed thermal model is evaluated experimentally on a totally enclosed fan cooled (TEFC) SynRM, and good correspondence between the analytical and experimental results is obtained.

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Section: Computation and Identification Of The Lptn Parametersmentioning

confidence: 99%

Section: Conduction Resistance Between the End Windings And The Motormentioning

confidence: 99%

R_{7} = \frac{\ln ()(, r_{o s} / false(r_{o s} - γ H_{y} false))}{2 π k_{air} ()(, L_{e c} - L_{s})},

Section: Computation and Identification Of The Lptn Parametersmentioning

confidence: 99%

Section: Conduction Thermal Resistance From Stator Windings (R 5 and mentioning

confidence: 99%

See 2 more Smart Citations

Development of analytical thermal analysis tool for synchronous reluctance motors

Ghahfarokhi

Kallaste

Podgornovs

et al. 2020

IET Electric Power Applications

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition, the load type also affects the winding losses and an extra winding loss occur according to the harmonic component frequency and amplitude in case of non-linear load. While the transformer core losses are assumed to be constant for no-load and loaded operations, the core losses can also be excessive in a certain ratio according to the harmonic frequency under non-linear load [8]. This can be explained by the extra power loss because of excessive eddy current losses on the core laminations.…”

Section: Introductionmentioning

confidence: 99%

Thermal behavior of a three phase isolation transformer under load conditions with the finite element analysis

Balci

2020

THERM SCI

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Transformers are generally designed to operate under the sinusoidal excitation and the method called classical design method is used in design process. Nevertheless, they have to operate under the partly or fully non-linear excitation because of the increasing amount of the non-linear loads such as rectifiers, electric motor drivers, compact fluorescent lamps, computers, etc. Non-linear loads cause abnormal temperature rise both in the core and in the windings of the transformer which are designed for sinusoidal excitation. Nowadays in the virtual environment provided by the electromagnetic design software, transformers can be easily modeled with the finite element method for any type of non-linear loads or excitations. In this study, 3-D electromagnetic and thermal modeling of the isolation transformer at a certain rated power level have been carried out. Then, the core and the winding temperatures of the transformer have been comparatively reported under the linear and non-linear load conditions. Besides, forced air-cooling method of the transformer has been tested with the CFD. This study has shown that, transformer temperature can be kept in the safe operating region in any type of load by deciding the fan speed providing the required air-flow according to the transformer temperature.

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A real-time temperature rise prediction method for PM motor varying working conditions based on the reduced thermal model

Guo

Jin

2023

Case Studies in Thermal Engineering

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Hybrid thermal model of a synchronous reluctance machine

Cited by 19 publications

References 12 publications

Development of analytical thermal analysis tool for synchronous reluctance motors

Development of analytical thermal analysis tool for synchronous reluctance motors

Thermal behavior of a three phase isolation transformer under load conditions with the finite element analysis

A real-time temperature rise prediction method for PM motor varying working conditions based on the reduced thermal model

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