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H. Votzi, H. Ertl:
"Cell Balancing of a Multi-Cell Battery Storage System for Renewable energy DC Micro-Grids";
Poster: PCIM, Nürnberg, D; 08.05.2012 - 10.05.2012; in: "International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable energy and Energy Management", (2012), ISBN: 978-3-8007-3431-3; S. 1480 - 1486.

The work focuses on tuning issues of a recently presented sensorless rotor temperature estimation technique for Permanent Magnet Synchronous Motors (PMSMs). The method implies an intermittent injection of a voltage pulse in the d-axis of the motor while keeping the load current zero. Thus, the resulting d-current response depends on both the initial value of the d-current itself and the actual magnetization level of the permanent magnets. Since the magnetization of the magnets depends on the temperature, different d-current slopes are associated with given temperature levels of the magnets. The sensitivity of the method depends strongly on the initial d-current and the injected voltage pulse width. Several method operating conditions will be discussed and compared in terms of sensitivity and influence on the motor performance.

http://publik.tuwien.ac.at/files/PubDat_210326.pdf