Traditionally, torque ripple reduction is achieved by proper motor design and by optimal shaping of the stator current waveform. The effectiveness of simultaneous use of both methods for total torque ripple reduction is presented on the example of three-phase permanent magnet synchronous motor with exterior-rotor. The influence of the magnet pole arc width and the influence of the supply current waveform on the torque ripple are considered in the analysis. The results of the analysis were obtained by the finite element method simulation and are verified experimentally as well.
COBISS.SI-ID: 10803222
The paper describes newly developed algorithm for the design and optimization of the medium voltage insulator elements. The algorithm provides a universal modelling of medium voltage insulator elements based on numerical analysis (Finite Element Method), parametric approach to input algorithm and different evolution algorithms use. Modelling mentioned above is necessary when it comes to the elements’ unreliability, which occurs after longer period of time. That is a consequence when all physical properties during nominal and extreme work (thunder strike) are not taken into consideration.
COBISS.SI-ID: 10266390
Magnetic field calculation is an important part of the electromagnetic device design process. Material hysteresis is considered in the calculation to get exact results. The numerical approach to the consideration of the hysteresis in the 3D finite element method calculation and analysis together with solutions of some problems connected with material hysteresis shapes is shown in the work. The material hysteresis is obtained with measurements. Calculation results are experimentally confirmed on the case of the magnetization set up for the characterization of semi and hard magnetic materials.
COBISS.SI-ID: 12358422
Technical problem, which is solved by the patent, is constructional solution in the production procedure of the multipole device for the precise magnetization of the high coercitive permanent magnets (as ferrite and rare earths), which need very high magnetic field strengths to reach the point of the magnetic material saturation, concentrated on the exactly defined and narrow areas. At the magnetization process the exact geometry shape of the magnetic poles, the stability of the magnetization process and minimum scattering of the magnetic field amplitude between single poles are assured.
COBISS.SI-ID: 9505302