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

100%

Ogbuka C. , Nwosu C. , Umoh G.

tom Vol. 67, nr 1

109--121

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.

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

100%

Schreier L. , Chomat M. , Dolezel I.

Zeszyty Naukowe. Elektryka / Politechnika Śląska

2001

tom z. 176

259-266

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.

Predictive torque and flux control for the synchronous reluctance machine

100%

Morales R. , Pacas M.

tom Vol. 54, nr 3

271-277

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.

Predictive torque and flux control for the synchronous reluctance machine

63%

Morales R. , Pacas M.

nr 3