M. Hofer, M. Nikowitz, M. Schrödl:
"An Efficiency Analysis of a Salient Pole and a Flux Barrier Synchronous Reluctance Machine including Flux Weakening";
Talk: IEEE Workshop on Electrical Machines Design, Control, Athen; 04-22-2019 - 04-23-2019; in: "IEEE Workshop on Electrical Machines Design, Control and Diagnostics (WEMDCD)", IEEE, IEEE 2019 (2019), ISBN: 978-1-5386-8107-7; 23 - 28.

In this work two different rotor topologies for
synchronous reluctance machines are discussed regarding the
efficiency including flux weakening operation of a variable speed
drive. For a low power industrial drives, currently utilized with
an induction machine, a salient pole and a flux barrier reluctance
rotor are designed to replace the squirrel cage rotor at lower
machine costs. Both rotors are built up and implemented in
the common three phase stator. The rotor change for this drive
is proposed, because generally a higher attention of electric
machine´s efficiency is set to the part load region according to
the latest IEC standards. The machine parameters as well as
the torque and power characteristic are discussed and finally the
machine efficiency is analyzed by measurements. As expected
from the finite element analysis the salient pole rotor provides
a higher power than the flux barrier type, especially at higher
speeds. The salient pole machine prototype is able to fulfill the
required power characteristic of the application, but the flux
barrier machine does not. Additionally, the salient pole rotor
shows a higher part load efficiency. From the loss analysis a high
loss portion is identified as the mechanical friction loss, which
dramatically limits the machine efficiency for both rotors. Thus,
a friction loss reduction by improved ball bearings is proposed,
which would improve the drive efficiency significantly.

Synchronous Machines, Reluctance Machines, Flux Barrier, Salient Pole, Efficiency

https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8887845