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Bucharest, Romania

Filipescu S.,Polytechnic University of Bucharest | Kreindler L.,Technosoft International
2014 International Conference on Optimization of Electrical and Electronic Equipment, OPTIM 2014 | Year: 2014

This paper presents an overview of the main types of speed estimators used for the digital control of permanent magnet synchronous motors (PMSM). Simulation analyses are performed and estimation errors are presented and compared for the proposed methods. After centralization of the obtained results, the authors indicate which method of speed estimation is better to be used at high or low speeds. © 2014 IEEE. Source


Naum B.,Technosoft International | Iacob I.,Technosoft International | Kreindler L.,Technosoft International | Kreindler L.,Polytechnic University of Bucharest | And 2 more authors.
Electrotehnica, Electronica, Automatica | Year: 2012

In the context of growing interest and importance for the development of modern and efficient solutions using electric vehicles, the concept of bike and car sharing is getting more interest. The management of such a docking station implies several functional aspects as: user-friendly, secure access management of vehicles; lock/unlock by authorized users; self-diagnosis and defect/failure detection mechanisms; remote control and supervision via Ethernet. The paper presents the structure, basic architecture and functionality of such a docking station, based on a 16-bit ARM-core microcontroller. Source


Kreindler L.,Polytechnic University of Bucharest | Iacob I.,Technosoft International | Casaru G.,Technosoft International | Sarca A.,Polytechnic University of Bucharest | And 2 more authors.
2015 9th International Symposium on Advanced Topics in Electrical Engineering, ATEE 2015 | Year: 2015

The paper proposes a practical solution for a permanent magnet synchronous motor (PMSM) using digital Hall position sensors. An improved estimation method for the electrical angle is used, based on a speed estimate and a specific correction algorithm. The speed estimation is implemented in a 'moving average' manner and is obtained at each Hall transition, for the last electrical period movement. This eliminates problems associated to Hall misalignment and misplacement, while still keeping a 60-degree upgrade rate for the estimation process. The position angle estimate is also gradually corrected based on the angle error detected at each Hall transition. A second phase correction, important at higher speeds, is used to compensate delays between Hall transition and the real-time interrupt control routine performing the vector control algorithm. Experimental results obtained on a 5kW (48V, 100Arms) three-phase, DSP controlled drive are presented and successfully validate the proposed solution. © 2015 IEEE. Source


Iacob I.,Technosoft International | Ignat A.,Technosoft International | Kreindler L.,Technosoft International | Kreindler L.,Polytechnic University of Bucharest | And 2 more authors.
2011 7th International Symposium on Advanced Topics in Electrical Engineering, ATEE 2011 | Year: 2011

For the control of an electric vehicle one must reach a good performance/cost ratio at a very high reliability of the system. Measuring the position with digital Hall sensors and applying advanced algorithms for position estimation allows one to implement a sinusoidal commutation of a brushless motor, using a vector control scheme. Thus, improved commutation efficiency, lower EMC radiation and increased system efficiency can be reached with a very cost-effective solution. © 2011 Univ Politehnica of Buchare. Source

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