Convective Heat Transfer Coefficients and Mechanical Loss Evaluation of Oil Splashing in Direct Cooled Electrically Excited Hairpin Motors
Paper i proceeding, 2022

There in an increasing trend in the use of the direct oil cooling in electric motors for automotive because of the increasing demand of high power/torque density as well as overload capability. One of the most immediate solution is to fill the housing with some oil level and benefit of the heat transfer from the oil splashing. The mechanical losses coming from the rotor rotation are well known and they represent a significant challenge, especially at high speed and high oil level. Therefore, the derivation and prediction of these losses have not been properly investigated leading to a lack in the current literature. Moving Particles Simulation (MPS) method is used in Particleworks to calculate the mechanical losses caused by the oil viscosity and convective heat transfer coefficients (HTC) are extracted for a 250 kW Electrically Excited Synchronous Machine at different speeds and oil levels.

E-mobility

Traction Motors

Direct Oil Cooling

Hairpin

Thermal

Electrically Excited Synchronous Machine (EESM)

Automotive

Electric Motors

Heat Transfer Co- efficient (HTC)

Författare

Luca Boscaglia

Chalmers, Elektroteknik, Elkraftteknik

Yujing Liu

Chalmers, Elektroteknik, Elkraftteknik

Hasan Avsar

EnginSoft SpA

Junfei Tang

Chalmers, Elektroteknik, Elkraftteknik

Massimo Galbiati

EnginSoft SpA

2022 International Conference on Electrical Machines, ICEM 2022

496-503
9781665414326 (ISBN)

2022 International Conference on Electrical Machines (ICEM)
Valencia, Spain,

HipeDrive - Högpresterande drivlina för fullelektriska tunga lastbilar och premium personbilar

Energimyndigheten (50190-1), 2020-04-01 -- 2023-09-30.

Development of efficient and environmental friendly LONG distance powertrain for heavy dUty trucks aNd coaches

Europeiska kommissionen (EU) (EC/H2020/874972), 2020-01-01 -- 2023-06-30.

Ämneskategorier

Tribologi

Energiteknik

Energisystem

DOI

10.1109/ICEM51905.2022.9910756

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Senast uppdaterat

2024-01-03