Dear students,

You are invited to attend the following MSc project presentation:

Title: "Design of a Synchronous Reluctance Motor Assisted with Permanent Magnets for Pump Applications"

Student: ADRIAN ORTEGA DULANTO

Project carried out at: Xylem

Supervisor: Dr Tanja Hedberg

Examiner: Docent Juliette Soulard

Time and venue: Monday, 30^th of March, 13.30 (obs!), seminar room, Teknikringen 33

Opponent: Celia Carvajal Almendros

Welcome!

Abstract:

This Master thesis focuses on the design of a high efficiency Permanent-Magnet-Assisted

Synchronous Reluctance Motor (PMASynRM) intended for pump applications. The new motor is

designed to replace an existing Induction Motor (IM) in a pump product.

The basic principles of SynRM, and PMASynRM Motors and a good analytical model were

introduced. Due to the complexity and high non-linearity of this specific electrical machine, Finite

Element Method (FEM) and an analytical model were combined. First, a parameter sensitivity

analysis was carried out with the software SPEED. However, SPEED does not give appropriate

results for the sensitivity analysis of the distance from the shaft to the first barrier, and in this

case, the FEM software FLUX was used instead. Using FEM as well, the risk of demagnetization

of the magnets was controlled for the nominal current and for overload conditions. Furthermore,

some conclusions were drawn in terms of the losses, and efficiency for the selected design. The

design fulfills the required efficiency placing either ferrite or neodymium iron bore magnets in

the rotor barriers. However, if ferrite magnets are employed, the maximum current should be

controlled to avoid demagnetization.

Finally, a ferrite PMASynRM prototype was built and tested in the lab. The simulation results as

well as the measurement of other possible technologies including IM and Line Start Permanent

Magnets (LSPM) machine were compared with the measurements of the prototype in terms of

efficiency, power factor and cost. It is concluded that the designed PMASynRM is a good

alternative as it surpassed the required efficiency and the results from the simulation were close

to the test measurements.

Keywords: Demagnetization study, efficiency, FEM, parametric study, Permanent-Magnet

Assisted Synchronous Reluctance Motor, prototype.