Analiza hlađenja pogonskog elektromotora računalnom simulacijom

master's thesis

• Title (english): Cooling analysis of the electric drive by computer simulation
• Author: Marko Matišić
• Mentor: Petar Ćurković (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2022-07-07, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

U diplomskom radu, nakon uvodnih tema te teorijske pozadine provedene su simulacije
računalne dinamike fluida za slučaj hlađenja pogonskog elektromotora automobila. Simulacije
su uključivale standardno korišteno vodeno hlađenje kao referentni model te više verzija
direktnog uljnog hlađenja motora. Za razliku od vodenog hlađenja gdje fluid struji unutar
kućišta motora, kod direktnog uljnog hlađenja ulje je u direktnom kontaktu s izvorima
zagrijavanja – statorskim namotima te statorskim paketom, te struji unutar prostora motora. Iz
modeliranih koncepata hlađenja, svaki s različitim kanalima za prolaz ulja promatrana su
temperaturna polja dijelova motora za više protoka te pad tlaka kako bi se identificirala najbolja
geometrija. Simulacije pokazuju kako se povećanjem broja kanala na vanjskom obodu statora te
postavljanjem kanala što bliže izvoru gubitaka postižu najbolji rezultati sa strane termalnih
performansi, no mogući su veliki padovi tlaka na što treba paziti pri odabiru metode hlađenja.
Uz simulacije geometrija, u radu se komentira proizvodljivost dijelova te materijal košuljice za
odvajanje statorskog i rotorskog dijela motora.

Abstract (english)

In this work, after introductory topics and theoretical background, computational fluid
dynamics (CFD) simulations for the cooling of an electric motor were performed. Simulations
include standard water cooling geometry as an reference model, and multiple direct oil cooling
geometries. Contrary to water cooling where the fluid flows inside the housing, in direct oil
cooling method, oil is in direct contact with heat generating components of the motor –
windings and stator stack, and flows on the inside of the motor. From those multiple models,
each with different oil channels, temperature fields were observed for multiple flows is addition
to the pressure drop to identify the best geometry. Simulations show that increasing channel
number on the stator outer diameter and placement of the channels as close to the thermal loss
sources, yield the best thermal performance, but big pressure drops can occur in the system,
which should be taken into account when choosing the cooling method.
Also, the manufacturability and material of the stator sleeve which separates stator from the
rotor is commented.

• Keywords: elektromotor; CFD simulacija; hlađenje elektromotora; direktno uljno hlađenje
• Keywords (english): electric motor; CFD simulation; electric motor cooling; direct oil cooling
• Language: croatian
• URN:NBN: urn:nbn:hr:235:039961
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-07-06 18:36:32