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Recently, a new five-level (5L) inverter has been developed. It is named 5L-USC1 and was based on the use of four 2L unidirectional switching cells (USC) and a coupled-inductor (CI) for each phase. This topology was derived from three-level Neutral-Point-Clamped (3L-NPC) inverter. In the paper a new 5L inverter based on basic USC is presented. It is named 5L-USC3 and is based on the use of six 2L...
Permanent magnet synchronous motors (PMSM) are used in a great variety of applications such as: electric toys, electric tools, medical/chemical industries, centrifuges at high speed, vehicle applications (motor starters), robot applications etc. All these have in common small size, high energy density, increased torque for a large speed range, high dynamics when high inertia is present. In consequence,...
In many cases designing or improving the parameters of electrical machines, including transformers, information on their parameters and behavior in different design stages is needed. This information is then processed via numerical models and if necessary leads to design decisions. In order to assess the influence of various quantities on the design decisions, in this paper two applications are considered:...
The paper presents numerical simulation results and experimental data used for modeling a hybrid step motor (HSM). Two different HSM models have been developed starting from available technical data of a HSM (2-phase, bipolar, frame size 56.4 mm). One of the models is adequate for analyzing the HSM response to different control strategies, while the second one can be used for performing an electromagnetic...
The paper presents the design, the calculus and a numerical simulation of the magnetic field, the electromotive force and the electromagnetic forces for a direct driven permanent magnet linear generator buoy, used to generate electric energy based on the sea wavepsilas energy. The magnetic field is computed using finite element method applied on a 3D model of the generator.
Basically, there are two developments in the field of transverse flux machines, without or with permanent magnets as excitation. Since the main feature of transverse flux machine is the high thrust force density, the linear motor topology including also permanent magnets as excitation is the most promising one. Because the transverse flux machine flux pattern is complicate due to the nonlinearities...
Today, for the same rated power and speed electrical drives we have a strong competitor to the induction motors. This one it is represented by permanent magnet synchronous motors (PMSM) with salient pole rotors. In this paper are presented dedicated analytical and numerical models for the iron loss effect over the motor performance. It is presented a comprehensive comparison between no-load and loaded...
The paper deals with an optimized unified power quality conditioner (UPQC), which aims at the integration of series and shunt active power Alters with minimum VA loading of the UPQC. The series active alter is a dynamic voltage restorer (DVR), that operates in two functioning modes. During the unbalanced voltage sag/swell at the input side, the DVR maintains the rated voltage at the load side. It...
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