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This paper aims to investigate through simulations and experimental results the effects of frequency on the iron losses in laminations adopted for electrical machines. To this aim, a comparison between an iron loss separation model and an advanced model (based on a nonlinear homogenization technique and the Jiles-Atherton model) is presented. Then, a new measurement method is introduced: an industrial...
This paper aims at comparing different methods for the identification of flux characteristics and differential parameters of synchronous machine adopted in sensorless drives. In particular, two computational methods and one experimental method are considered: the first method is based on a Small-Signal FE simulation strategy, while the second method is based on Time-Domain FE simulations. Both strategies...
An auto-tuning and self-adaptation procedure for high-frequency injection (HFI) based position and speed estimation algorithms in IPMSM and SynRM drives is proposed in this paper. Analytical developments show that the dynamics of the high-frequency tracking loop varies with differential inductances, which in turn depend on the machine operating point due to saturation. On-line estimation and adaptation...
Micro-hydroelectric power plants exhibit low efficiency due to the small size. For this reason, the selection of a high-efficiency electrical machine is particularly important in order to improve the performance of the generation system and to respect the energy policies. In this paper, the performance of different types of machine are computed and compared. In particular an Induction Machine (IM),...
This paper presents the validation of a small-signal finite-element simulation strategy comparing different simulation approaches. At first, a full 3-D non-linear model in the time domain is presented. Then, the small-signal strategy has been applied to the 3-D model achieving a considerable reduction of computational time. In both 3-D models, the eddy currents in the laminations are fully modeled...
This paper aims to compare different methods for the computation of the iron losses. First of all, a brief recall on iron losses models is considered. In particular, Bertotti's formula, a homogenization technique and a vectorized Jiles-Atherton model are implemented. Afterwards, the adopted methods are validated considering an iron ring and an inset PM synchronous machine. A comparison between experimental...
This paper aims to compute the high-frequency parameters of an inset permanent magnet synchronous machine. A homogenization technique for the computation of the eddy currents and the identification of the d-q model at high-frequency of the synchronous machine are briefly recalled. The simulation strategy for the Inset PM motor is introduced. A comparison between the high-frequency parameters is highlighted...
This paper presents the computation and the measurement of the high frequency parameters in an inset permanent magnet synchronous machine. Different operating conditions are considered: both at no-load and under load. The d-q model at high frequency of the synchronous machine is briefly recalled and then the simulation strategy is introduced. Then the experimental setup is described and the measurement...
This paper considers the design of a high efficiency small-size generator for micro-hydroelectric energy production. Different generator designs are compared in order to identify the best solution to be adopted in such installations. Due to the small power rating, the same generator is considered in different installations, with different net heads and water flow. This allows to improve the cost-effectiveness...
During the last years, energy efficiency has become one more and more important problem. Therefore, it is important to exploit the energy sources at best. The potential hydroelectric energy is almost totally exploited in Italy, but it still exists the possibility to manufacture new micro-hydroelectric plants. Nevertheless, design costs are very burdensome because it needs to consider a specific design...
There is a growing interest in adopting electrical motors exhibiting high efficiency. Therefore, induction machines are often replaced by more efficient electrical drive solutions. Variable-speed drives are often chosen instead of the traditional grid-connected solutions, so as to avoid unefficient regulations at constant speed, when the machine operates at part load.
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