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1

Synchronous reluctance motor analytical model cross-saturation and magnetization analysis

Knebl Ladislav, Bianchi Nicola, Bacco Giacomo, Ondrusek Cestmir

Przegląd Elektrotechniczny

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2020

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R. 96, nr 1

108--112

EN

The synchronous reluctance motor design process is usually considering objectives that are in direct or indirect relationship with the rotor magnetic saliency ξ. The magnetic saliency is deﬁned as the ratio of direct (d) Ld and quadrature (q) inductances Lq. Both inductances and their dependence on the dq-axis current plane are investigated with a non-linear analytical model in this paper. With the non-linear analytical model linked to the analysis procedures is also possible to determine the synchronous reluctance motor cross-saturation effect.

PL

W artykule analizowano asymetrię magnetyczną (saliency) wirnika silnika reluktancyjnego. Zastosowano model nieliniowy uwzględniający tę asymetrię i umożliwiający określenie efektu nasycenia.

2

A new cross-saturated torque model of highly utilized synchronous reluctance machine

Ogbuka C., Nwosu C., Umoh G.

Archives of Electrical Engineering

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2018

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Vol. 67, nr 1

109--121

EN

A new cross-saturated torque model of the synchronous reluctance machine (SynRM) including a direct incorporation of cross-saturation effects is presented. Direct-quadrature (d-q axes) flux linkages for both saturation and cross-saturation conditions, obtained experimentally through current decay test using open winding fixed rotor method, are accurately curve-fitted and linearization between the two extremes yielding analytical functions for cross-coupled d-q axes flux linkages. These flux linkages are used to achieve a cross-saturated flux linkage-based torque model for highly utilized SynRM. The accuracy of the developed torque model is evaluated by comparing with the experimentally measured torque of a 5.5 kW SynRM in a dynamometer test bench which also measures and account for the effect of iron losses. The close similarity of the experimental results with the developed model proves the accuracy of the model and its suitability for direct incorporation in control algorithms of advanced SynRM drives without the use of look-up tables.

3

Rotor Geometry Parameter Optimization of Synchronous Reluctance Motor Using Taguchi Method

Azizi H., Vahedi A.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 1a

197--201

EN

In this paper the effect of rotor geometry parameters on the d-axis and q-axis inductance of synchronous reluctance machines is investigated and an optimum design parameter combination is achieved to improve the saliency ratio as well as the performance of drive system. The 2D finite-element model of synchronous reluctance machine is used to construct the Taguchi design of experiments. The level of importance of each design parameter on the response surface is determined by using the Taguchi algorithm and analysis of variance results. The confirmation FEM simulation results indicated that the torque to current ratio and steady state performance of synchronous reluctance machines are improved appropriately in comparison with initial design, by using the proposed Taguchi optimization methodology.

PL

W artykule opisano wpływ parametrów geometrycznych wirnika maszyny reluktancyjnej synchronicznej, na wartość indukcyjności w osiach d i q. Opracowano optymalny sposób doboru tych parametrów w celu ograniczenia asymetrii magnetycznej maszyny. W budowie modelu metodą Taguchiego, wykorzystano model elementów skończonych w 2-D. Wykazano, że parametry maszyny, wyznaczone metodą optymalizacji Taguchiego pozwalają na osiągnięcie lepszych, w porównaniu z oryginalnymi, odpowiedzi prądowych oraz momentu mechanicznego.

4

Predictive torque and flux control for the synchronous reluctance machine

Morales R., Pacas M.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2006

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Vol. 54, nr 3

271-277

EN

This paper presents a predictive torque and flux control algorithm for the synchronous reluctance machine. The algorithm performs a voltage space phasor preselection, followed by the computation of the switching instants for the optimum switching space pha-sors, with the advantages of inherently constant switching frequency and time equidistant implementation on a DSP based system. The criteria used to choose the appropriate voltage space phasor depend on the state of the machine and the deviations of torque and flux at the end of the cycle. The model of the machine has been developed on a d-q frame of coordinates attached to the rotor and takes into account the magnetic saturation in both d-q axes and the cross saturation phenomenon between both axes. Therefore, a very good approximation of this effect is achieved and the performance of the machine is improved. Several simulations and experimental results using a DSP and a commercially available machine show the validity of the proposed control scheme.

5

Effect o machine geometry on higher harmonics content in air-gap magnetic field of synchronous reluctance machine

Schreier L., Chomat M., Dolezel I.

Zeszyty Naukowe. Elektryka / Politechnika Śląska

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2001

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z. 176

259-266

EN

The presented paper deals with the effect of rotor geometry on the magnetic field distribution in the air gap. The magnetic field is analysed by means of the finite element method. Thid method represents, however, quite a laborious and time-consuming process. Therefore, a simpler semianalytical method for evaluation of the magnetic field distribution in the air gap and following determination of parameters for a numerical model of the machine based on lumped parameters has been proposed. This model enables considering the effect of a series of higher harmonics of the air-gap permeance on electromagnetic quantities of the machine.