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Poltschak F.,Johannes Kepler University | Amrhein W.,Johannes Kepler University | Amrhein W.,ACCM Austrian Center of Competence in Mechatronics
SPEEDAM 2010 - International Symposium on Power Electronics, Electrical Drives, Automation and Motion | Year: 2010

Permanent magnet synchronous machines (PMSM) are getting increasingly more used in the area of fractional hp drives. Additionally the specifications often include the demand to control the motor sensorless. Many position sensorless control strategies that still work at low speed or standstill are based on the analysis of the inductance difference in the rotor oriented d- and q-coordinate system. While the influence of the rotor geometry on the inductance has been discussed a lot, the main objective of this paper is to investigate the influence of the winding system on the inductances and the inductance ratio between the d- and q-direction. This serves as a measure for the suitability of the motor for sensorless control. An analytical formula is presented to estimate the flux linkage between the phases as well as the inductance ratio. Both characteristics are verified with FE-analyses and sample measurements. © 2010 IEEE. Source


Poltschak F.,Johannes Kepler University | Amrhein W.,Johannes Kepler University | Amrhein W.,ACCM Austrian Center of Competence in Mechatronics
SPEEDAM 2010 - International Symposium on Power Electronics, Electrical Drives, Automation and Motion | Year: 2010

Sensorless control schemes that operate well even at low speeds or at standstill are mainly based on the evaluation of the machine saliences. Hence a sufficient inductance ratio independent of the rotor angle is essential for permanent magnet synchronous machine (PMSM) drives. This paper analyzes the origin of the angle dependence of the inductance ratio and shows that saturation has an important influence. In many cases saturation deteriorates the inductance ratio, but it can be shown that saturation can also be used to improve it. This is especially important for non-salient machines to make them suitable for sensorless control. The paper concludes with design guidelines to improve the inductance ratio for non-salient machines. © 2010 IEEE. Source


Bramerdorfer G.,Johannes Kepler University | Bramerdorfer G.,ACCM Austrian Center of Competence in Mechatronics | Zavoianu A.-C.,ACCM Austrian Center of Competence in Mechatronics | Zavoianu A.-C.,Fuzzy Logic Laboratory Linz Hagenberg | And 5 more authors.
Proceedings - 2015 IEEE International Electric Machines and Drives Conference, IEMDC 2015 | Year: 2015

This article deals with accelerating typical optimization scenarios for electrical machine designs. Besides the advantage of a reduced computation time, this leads to a reduction in computational power and thus to a lower power consumption when running the optimization. If high power density is required, usually highly-utilized electrical machines which feature nonlinear characteristics are applied. As a consequence, typically optimization scenarios are considered where the evaluation of a potential design requires computationally expensive nonlinear finite element (FE) simulations. It is obvious that improving the speed of optimization runs takes top priority and various measures can be considered. This article is about (i) basic easily achievable measures, (ii) techniques for an efficient exploration of the design space, and (iii) advanced strategies to reduce the simulation time, e.g., (a) sophisticated emerging techniques for modeling machine characteristics by paring the number of required FE simulations down to the minimum and (b) nonlinear modeling of the targets of the optimization scenario as functions of the design parameters to further reduce the number of FE evaluations. By way of illustration, the analysis of a typical optimization task is given and achievable speed improvements as well as still present bottlenecks are discussed. © 2015 IEEE. Source


Bramerdorfer G.,Johannes Kepler University | Bramerdorfer G.,ACCM Austrian Center of Competence in Mechatronics | Silber S.,Johannes Kepler University | Silber S.,ACCM Austrian Center of Competence in Mechatronics | And 4 more authors.
Proceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013 | Year: 2013

Due to the increasing significance of energy saving, multiple regulations have been introduced by countries or international organizations regarding the efficiency of electric drives, e.g. the IEC1 60034-30 [1]. In the past, many companies replaced induction machines (IMs) by permanet magnet excited synchronous machines (PMSMs). This lead to a considerable increase of the efficiency, but due to the fluctuating price of the permanent magnets, especially of Neodymium-Iron-Boron(NdFeB)-magnets, the cost of PMSMs is hardly predictable. Therefore, many manufacturers are investigating in synchronous reluctance machines (SyncRM) now. © 2013 IEEE. Source


Bramerdorfer G.,Johannes Kepler University | Bramerdorfer G.,ACCM Austrian Center of Competence in Mechatronics | Amrhein W.,Johannes Kepler University | Amrhein W.,ACCM Austrian Center of Competence in Mechatronics | And 2 more authors.
IECON Proceedings (Industrial Electronics Conference) | Year: 2013

Brushless permanent magnet machines (BPMMs) gained more importance due to the high power density ensured by permanent magnets with high energy densities. Therefore, a more compact design can be achieved compared to other types of electrical machines. © 2013 IEEE. Source

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