Viktor Goričan

Design and Finite-Element Analysis of Interior Permanent Magnet Synchronous Motor With Flux Barriers

The paper presents a finite-element method-based design and analysis of interior permanent magnet synchronous motor with flux barriers (IPMSMFB). Various parameters of IPMSMFB rotor structure were taken into account at determination of a suitable rotor construction. On the basis of FEM analysis the rotor of IPMSMFB with three-flux barriers was built. Output torque capability and flux weakening performance of IPMSMFB were compared with performances of conventional interior permanent magnet synchronous motor (IPMSM), having the same rotor geometrical dimensions and the same stator construction. The predicted performance of conventional IPMSM and IPMSMFB was confirmed with the measurements over a wide-speed range of constant output power operation.

Flux distortion and iron losses in flux-weakened permanent magnet synchronous motor

Abstract The iron losses were determined by using modelled properties of used electrical steel and calculated flux distribution in the core of the four-pole permanent magnet synchronous motor, working in the flux-weakening regime. The distribution of the magnetic induction B (t) in all parts of the motor was obtained by the numerical simulation of magnetic conditions using static 2D finite element software for a complete cycle of field variation. The results of iron loss determination were compared with the results obtained from experiments on the actual machine.

Field homogeneity in a two-phase round rotational single sheet tester with one and both side shields

Round rotational single sheet tester is used for the measurement of magnetic properties in rotational and alternating magnetic fields. The influence of one and both side shields on the field homogeneity in the sample is investigated with finite element calculation. The aim of the calculation is to define the optimal position of one or both side shields in order to expand the rotational field homogeneity area. We want to reach the area of the homogeneous field as large as possible. The best result is achieved with two sides shielding.

Unreliable determination of vector B in 2-D SST

Rotations of vector B in a square rotational single sheet tester and a round rotational single sheet tester were compared. Two pairs of B coils (45° displaced) were used to control and verify the rotation of vector B at different coil diameters. It was clarified that two sinusoidal induced voltages in B coils do not ensure the rotational flux condition in the area inside the B coils in the sample, especially in a larger measuring region.

Increasing of output power capability in a six-phase flux-weakened permanent magnet synchronous motor with a third harmonic current injection

This paper presents a FEM based analysis of output power capability improvement (OPC) in a six-phase flux-weakened permanent magnet synchronous motor with a harmonic current injection. It is shown that the flux-weakened permanent magnet synchronous motor with the third harmonic current injection is capable of producing more output torque per RMS current flowing through the windings than the same motor supplied with sinusoidal currents. The results of the analysis are partially verified with the measurements.

Hysteresis model and examples of ferromagnetic materials

This work deals with the application of the scalar product model to different ferromagnetic materials. Different hysteresis curves and minor loops are measured to examine the behavior of the magnetization and to compare it with theoretical calculated curves.

Anisotropic Generalization of Vector Preisach Hysteresis Models for Nonoriented Steels

A Preisach-type vector hysteresis model is developed to represent anisotropic material characteristics under static and dynamic conditions. Bi- and uniaxial anisotropy are incorporated by generalizing the input projection of the vector model. Frequency-dependent eddy current and excess effects are considered by an additional field strength component. The model is applied to simulate the magnetic properties of weakly anisotropic nonoriented magnetic steel. The simulation results are successfully validated against measurements under alternating and circular flux carried out on a rotational single-sheet tester.

The measurement of power losses at high magnetic field densities or at small cross-section of test specimen using the averaging

It is difficult to achieve sufficient accuracy of power loss measurement at high magnetic field densities where the magnetic field strength gets more and more distorted, or in cases where the influence of noise increases (small specimen cross section). The influence of averaging on the accuracy of power loss measurement was studied on the cast amorphous magnetic material Metglas 2605-TCA. The results show that the accuracy of power loss measurements can be improved by using the averaging of data acquisition points.

Measurement of 2-D Magnetic Properties of Grain Oriented Silicon Steel Sheet Using Rrsst

The round rotational single sheet tester (RRSST) is presented in order to identify its performances at higher flux densities and pure rotational flux condition in case of GO silicon steel sheets. The magnetic properties were measured in pure rotational and alternating flux condition. The difference between the rotational loss in clockwise and counter clockwise rotation of vector B was considered to have a physical origin. The ability to control the vector B in measuring region on GO material was considered. Additional advantages of a RRSST over square rotational single sheet tester were pointed out.

Field homogeneity in a two-phase rotational single sheet tester with square sample

A rotational single sheet tester with square sample (SRSST) is used for the measurement of magnetic properties in rotational and alternating magnetic fields. Two perpendicular measuring coils are coiled up, in the middle of the sample, through the holes in the sample. To obtain the proper size of the measuring coils, the homogeneity of the magnetic field and the influence of eddy currents on the homogeneity of the magnetic field distribution in the sample are investigated.