U. Rieder, M. Schrödl:
"Optimization of Saliency Effects of External Rotor Permanent Magnet Synchronous Motors with Respect to Enhanced INFORM-Capability for Sensorless Control";
Talk: 10th European Conference on Power Electronics and Applications, Toulouse; 09-02-2003 - 09-04-2003; in: "Proceedings", (2003), ISBN: 90-75815-07-7.

In many applications like traction, starter generators and direct drives the need for high torque is the basic issue. This paper presents the combination of advantages of External Rotor PMSMs and sensorless control algorithms, especially for low speed using the INFORM-method (Indirect Flux Detection by Online Reactance Measurement). Therefore saliency and saturation effects have to be taken into consideration and can be enforced for improved INFORM performance.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04404018