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EN
The paper deals with computer simulations of dynamic performance of two pole synchronous reluctance motor with axially laminated, anisotropic rotor. Geometry of the rotor was modified so as to create a kind of damping cage made of aluminium layers, expected to enhance stability of the motor during transients. A simplified model including damping circuits was derived and implemented in Matlab/Simulink environment. A series of simulation were performed for different start up parameters (initial voltage, initial frequency, start-up duration), shaft torque step and moment of inertia. The simulation results show a noticeable improving of stability of the motor with modified rotor structure. Especially, even at fast start up and considerably big step of shaft torque, there are very little speed oscillations and the motor is inherently stable.
EN
The paper presents a field-circuit approach to determining the steady state performance characteristics of synchronous reluctance motor with magnetic circuit non-linearity taking into account. The method was implemented for the calculation of torque-angle characteristic and main exploitation parameters characteristics of two pole synchronous reluctance motor with axially laminated, anisotropic rotor. For a number of consecutive values of current angle and different excitation levels the direct and quadrature axis current components were calculated. On the basis of radial component of airgap flux density distributions resolved for both axes and each excitation current value, the magnetizing flux linkages in direct and quadrature axes were determined. Calculated flux linkage vs. excitation current functions were stored as a look-up tables. An iterative method of solving a set of non-linear algebraic equations was adopted, with values of flux linkages taken from a look-up table. The curves obtained on the basis of field-circuit model and measured ones were presented together for comparison. The reasons for observed discrepancy between calculated and measured curves were discussed.
PL
W referacie przedstawiono analizę wpływu stopnia nasycenia obwodu magnetycznego maszyny reluktancyjnej synchronicznej z wirnikiem anizotropowym o uwarstwieniu poosiowym na przebieg charakterystyki kątowej momentu. Przeprowadzono symulację komputerową wyznaczenia tej charakterystyki na podstawie wyników numerycznej analizy rozkładu pola magnetycznego metodą elementów skończonych. Dokonano analizy źródeł powstawania obserwowanych pulsacji momentu obrotowego. Wyniki obliczeń poddano weryfikacji eksperymentalnej na drodze pomiarowego wyznaczenia charakterystyki kątowej momentu dla modelu silnika reluktancyjnego zbudowanego na bazie stojana dwubiegunowego indukcyjnego silnika klatkowego.
EN
The paper presents an analysis of the influence of magnetic core saturation level on torque versus the current angle characteristic of a synchronous reluctance motor. A two-pole axially-laminated anisotropic rotor structure was taken into account. The characteristic was first determined on the basis of numerical analysis of the magnetic field distribution at standstill using the finite element method. Calculation results were discussed and verified by measurements of torque versus the current angle characteristic of the experimental model of a synchronous reluctance motor. The model was build using the stator of a typical induction motor. The effects of changes of optimal current angle for maximum torque per ampere condition and torque pulsation increasing caused by saturation were outlined and analysed.
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