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M. Samonig, T. Wolbank:
"Analyzing the Influence of Induction Machine Design on Transient Slot Leakage Inductance with respect to Sensorless Rotor Position Estimation";
Talk: IEEE International Electric Machines and Drives Conference (IEMDC), Miami, Florida; 05-21-2017 - 05-24-2017; in: "Ieee Iemdc 2017", IEEE, (2017).

The paper analyzes the transient reaction of
squirrel cage induction machines to voltage step excitation. The
involved excitation technique uses the drive´s inverter to excite the
machine with voltage steps. The transient nature of these steps
demands high flux linkage derivatives. In response, the squirrel
cage acts as a barrier hindering the flux to penetrate the rotor yoke
and forcing it into the air gap. Thus, the stator winding is linked
to pure leakage flux, composed of slot and zig-zag leakage. A
turning rotor modulates these flux components by changing the
machine´s magnetic permeances. Since these modulations are
linked to the rotor slotting, they may be exploited to derive a rotor
position signal. Understanding and predicting them is the key to
assess different IM designs with respect to their applicability for
sensorless position estimation. The investigation methodology
used includes analytical modelling and finite element simulations,
confirming the results of each other. Finally, different design
variations are assessed.

transient magnetic flux leakage, analytical model,

http://publik.tuwien.ac.at/files/publik_267190.pdf