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This paper presents a method for generating stator currents supplying a surface permanent magnets synchronous motor with lack of turns in one of its winding. The currents are calculated in order to minimize the torque ripple generated by the dissymmetry. The analytical model used is based on the role of the space harmonics of the stator and rotor flux density on generation of torque harmonics. This...
Nowadays many wind turbines use a doubly fed induction machine (DFIM) as a generator (DFIG). The brushless DFIM (BDFIM), however, has increased fault handling capabilities and suffers less from reliability issues. This paper presents a different method of analytically evaluating the BDFIM. This is done by analyzing the flux density produced by the two stator windings and the interaction with the nested...
Recently, magnetic gearboxes (MGBs) are serious contenders to their conventional mechanical counterparts in terms of reduced maintenance requirements, improved reliability, tolerance to mechanical inaccuracies, and inherent overload protection. MGBs are preferably employed in high speed applications and compact harsh environments. One of the challenging design aspects of MGBs is the proper selection...
This paper focuses on a robustness controller and the performance of a permanent magnet synchronous machine (PMSM) with parameter uncertainty. The proposed controller is composed by a model reference adaptive current controller and a torque compensator. An internal model of the PMSM is introduced to define the transient reference behavior of the current and torque. A simple adaptation rule of the...
Switched reluctance (SR) motors have many advantages such as simple and solid construction, low-cost on manufacturing, excellent reliability at high temperatures, and large torque density. However, the higher torque ripple from magnetic saliency is a serious problem preventing its applications from being expanded. Several torque control methods have been already proposed. In practical use, a controller...
This paper compared the effect of full-pitched and tooth windings on performance of double stator switched reluctance machines. The main scope of the research presented here is to obtain higher power/torque density for an existent double stator switched reluctance machine (DSSRM). The chosen approach is intended to reduce the amount of copper by applying a winding configuration that allows shorter...
A novel finite element solution post-processing technique to determine the effects of rotor skewing is presented in this paper. It was previously proposed that a post-processing semi-numerical method to calculate the harmonic torque components in synchronous machines is useful to machine designers. Harmonic Maxwellian stress components create parasitic effects during machine operation such as torque...
The saturation in the stator teeth of an 18-slots 16-poles TC-PMSM with sinusoidal current supply caused by the interaction of armature reaction fluxes and rotor-PM-produced fluxes is studied. It is found that under load some teeth are saturated deeper than others. An increase in the width of these teeth reduces the oversaturation, which locally prevents the decrease in the inductance and back-EMF,...
The brushless DFIM is a complex machine type. Though never commercially exploited, it has a great potential as generator system in large-scale wind turbines. This paper develops an analytical magnetic field model for the brushless DFIM. Since the brushless DFIM rotor construction has a rich space harmonic spectrum, attention is paid to the effects of winding space-harmonics. The developed model is...
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