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E. Schmidt, W. Brandl, C. Grabner:
"Optimization of a Synchronous Reluctance Machine for a Sensorless Drive with a Wide Field-Weakening Range";
E&I Elektrotechnik und Informationstechnik (invited), 124 (2004), 3; 89 - 94.

Since more than one century, electrical machines are utilized for
electrical drives. Nowadays, in most applications the electrical machine
will be fed by an inverter. Three types of machines are available for
such purposes, the asynchronous induction machine, the permanent magnet
excited synchronous machine and the synchronous reluctance machine.
Thereby, reluctance machines represent an alternative to the other types
when utilized in high-performance drives with a wide speed range. Due to
the rotor saliency, these machines have an inherent suitability for a
position-sensorless control.
The parameters of a 5 kW machine with a maximum speed of 8000 rpm are
evaluated by means of nonlinear finite element analyses. With regard to
an application in a high-performance drive with a wide field-weakening
range and a position-sensorless control scheme, the characteristics are
calculated both for the conventional reluctance machine as well as the
reluctance machine with additional permanent magnets in the rotor.
The comparison of the characteristics of both the conventional reluctance
machine and the permanent magnet assisted reluctance machine clearly
shows the improved performance in terms of electromagnetic torque and
power factor due to the interior permanent magnets. Thereby, the
suitability for the application in position-sensorless drives due to
the high effective saliency is preserved.

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