Master Thesis - Delta connected PMSM for traction of heavy vehicles

Background of thesis project


The heavy vehicle market is shifting towards electrification. The electric traction machine, being one of the key components, is facing tough requirements on performance as well as cost. To meet these requirements, it is desirable to re-use the electromagnetic design and scale the length to reach different power levels. With hairpin windings, scaling in length is limited to discrete steps, to keep the induced voltage flux linkage in the correct order. By introducing delta connection as an option, additional steps for scaling the length are introduced. With delta connection, the machine design becomes sensitive to 3rd order harmonics introducing unwanted circulating currents.


Suitable background


The students should be familiar with electromagnetic simulations of electric machines and must have a basic understanding of electric machines and its surroundings. Any courses on electric or hybrid electric vehicle technology is appreciated.


Description of thesis work


A literature review should be done to identify aspects of importance for minimizing the occurrence of 3rd order harmonics. Focus shall be on rotor designs and how e.g. pole pitch and magnet locations and angles affect the 3rd harmonics. The findings should be followed up and verified with simulations in a FEM environment, (e.g. Maxwell, MotorCad, FEMM, etc).
The goal is to investigate and list parameters in a PMSM that would increase the risk of introducing 3rd order harmonics, leading to unwanted circulating currents in a machine with delta connected windings.


Thesis Level: Master


Language: English


Starting date: January 2023


Number of students: 2


Tutor
Rasmus Andersson, Specialist Research Engineer, +46 31 3231301
Nikhil Manakshya, Electric Motor Design Engineer, +46 31 3225052
Zhe Huang, Expert System Design Engineer, +46 31 3238788


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