Ovidiu Craiu

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The paper presents a new double layer three phase 4 to 6 pole-changing winding, with 48 slots and 6 terminals. In order to obtain a higher fundamental winding factor when winding is 6-pole connected, a degree of asymmetry is accepted for the winding when 4-pole connected. The new winding is compared with a well known two-layer winding presented in(More)
The paper presents a 3D numerical analysis of the thermal behavior of a small permanent magnet DC motor, performed by Finite Element Method (FEM). The accuracy of the computed temperatures was confirmed by comparison with experimental results; a prototype of the motor was tested in the steady-state in order to calibrate the numerical model. The motor was(More)
The paper presents a FEM numerical model of a permanent magnet synchronous motor used in electrical vehicles. The motor is mounted directly on the vehicle wheel and has 2p=28 poles, Z=21 slots. The stator winding is made of field coils wound around each tooth. This configuration allows obtaining high torques at low speeds, reduced motor size,(More)
This paper presents a comparison between several numerical and analytical methods used to evaluate the End-Winding Inductance (EWI) of three phase stator windings of induction or synchronous machines. A prototype of a Permanent Magnet Synchronous Machine (PMSM) is considered as a case study for the illustration of the computational and experimental(More)
A new concept of three-phase permanent-magnet synchronous motor with rotor embedded starting squirrel-cage is presented. The rotor has been equipped with ring shaped inner permanent magnets axially-magnetized and placed between consecutive claw poles built as ferromagnetic modular pieces. The start and the steady operation of the manufactured prototype have(More)
The paper presents a new contactless hybrid excited claw pole synchronous machine. The excitation field is produced by both NdFeB permanent magnets mounted on the rotor, and two fixed coils embedded within machine shields, and fed from a controlled DC source. A 3-D numerical model based on the Finite Element Method (FEM) that takes into account the magnetic(More)
The electromagnetic complex phenomena inside electrical machines make the determination of specific mathematical models rather laborious. Often, the electrical machine analysis is made based on simplified assumptions according to which iron losses are neglected and iron permeability is considered infinite. Thereby, the whole magnetic energy, on which is(More)
A — ELECTROMAGNETIC FIELDS & NUMERICAL METHODS A1. WHEAT SEEDS SEPARATION IN THE HIGH-INTENSITY ELECTRIC FIELD Tiberiu Butunoi, Gabriela Buda, Cristian Dragos, Adrian Samuila, Vasile Neamtu, Roman Morar, Lucian Dascalescu, Alexandru Iuga A2. ANALYSIS OF COUPLED OSCILLATORS BY STATE VARIABLE METHOD Mihai Iordache, Lucia Dumitriu, J M Paillot, Iulia(More)
This paper presents a 2D finite element analysis of a counter-rotating permanent magnet wind generator. The studied device is a two in one electrical machine used for counter-rotating dual rotor wind turbines used to convert the wind energy into electricity. The purpose of this study is to design the machine and to estimate its behaviour using the finite(More)
The paper presents numerical and experimental results of a 1.6 KW and 3 kW wind generators with permanent magnet claw poles. A 3D model based on finite element method (FEM) considering the nonlinearity of the magnetic circuit and the movement of armatures was used to calculate the generator's characteristics at load and no-load. Experimental tests were(More)
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