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The proposed numerical model is used to study the physics of inter-bar currents by investigating the three dimensional field solution. The long-term aim is to get a deeper and more accurate understanding of the physics to be able to further fine tune analytical theories about inter-bar currents. This work is used to verify the model and to get an idea of what can be achieved with it in the future...
The classic single-phase equivalent circuit is used to predict the steady-state operation of symmetrical induction machines under balanced sinusoidal supply. Its scope can be extended by considering variable parameters depending on the main influencing quantities, thus allowing to account also for secondary phenomena affecting the machine operation, such as magnetic saturation and skin effect. This...
Brushless doubly-fed induction machines have great potential as variable-speed generators in wind turbines. Undesired space harmonics exist because the special rotor needs to couple both stator windings which with different pole-pair numbers and different frequencies. These undesired space harmonics lead to a bigger torque ripple compared with conventional induction machines. Previously, a 2D multi-slice...
In this paper, a high energy efficiency control strategy for electric power generation with synchronous reluctance machine (SynRM) is proposed. This kind of machine is gaining attraction in various fields of application due to its high efficiency, compactness and the capability of operating over a wide speed range. These features are highly desirable for generators especially those that operate from...
This paper investigates the opportunity of making a natural convection permanent magnet motor for an airliner flight control actuator. The motor is designed to have a maximum lifespan and reliability: removing liquid or forced air cooling removes a fault source. A thermal analysis of the power that can be dissipated by natural convection and radiation is conducted. A winding with fully segregated...
This paper presents a Flux Reversal Machine designed for the fan applications with rotor and stator cores made of Soft Magnetic Composite materials (SMC FRM). The advantages of SMC FRM such as the short flux paths, easiness of inducing the winding MMF even when the number of poles is high and the wasteless production technology allow designing cheap and high effective motors. The SMC FRM has high...
This paper proposes a new motor with stator magnet using the magnetization reversal technique. The proposed motor has a magnet which has a small coercive force in the stator tooth. In this motor, a pulse current is added to stator magnet to change its magnetized direction. Then the stator magnet becomes a magnetic pole, and the motor is driven by generating an alternating magnetic field by the stator...
Owing to the fact that the performance and control design of large scale induction machines depend on accurate knowledge of its equivalent electrical circuit parameters, precise identification of these parameters is essential. Current methods used to quantify induction machine parameters call for performing several experimental testing such as no-load, locked-rotor and DC tests which may not be available...
The paper presents a novel and simple model to analyze multi-n-phase electric machines. A parametric model is given together with the mathematical rules that defines the optimal machine structure giving a prediction of torque ripple harmonic orders. The model is applied to two multi-n-phase motors and their performance indicators are given to validate the model. The possibility to strongly reduce...
Actuators for more electric aircraft are predominantly based on permanent magnet machines for the best power to weight ratio. However, permanent magnet machines can give rise to drag torque under short circuit conditions. This paper explains the concept of permanent magnet assistance in switched reluctance machines and sets out a topology which maximizes the benefits of permanent magnet assistance...
This paper reviews the recent developments of semi-analytical subdomains modeling techniques to compute the flux density distribution in electrical machines by the exact solving of Maxwell equations. It is shown that with an appropriate development methodology and numerical implementation, these harmonic models break the traditional compromise between accuracy and computation time that must be done...
The impact of manufacturing tolerances on the performance of a permanent magnet synchronous generator is investigated. A generator with a flux concentrating spoke-type rotor, with ferrite permanent magnets, is used in the investigation. Measurements of the air gap magnetic flux density, the air gap length, as well as the magnetization and size of the permanent magnets have been performed. Correlations...
This paper investigates a novel harmonic current injection method to optimize air-gap and yoke flux density distribution for multiphase motor simultaneously. The effect of harmonic currents on air-gap flux density and yoke flux density is analyzed as a whole. The proposed method fully makes use of multiple control freedoms, and the optimal coefficients for corresponding harmonic current are derived...
This paper deals with an improved analytical model of Synchronous Reluctance (REL) machine with eccentricity. This model considers the magnetic saturation occurring in the different iron parts of the stator and the rotor. This saturation results from the actual B-H characteristic of the iron. In addition, the slotting effect is considered in the analytical model. The unbalanced magnetic force (UMF)...
Recent investigations on IMs with FSCWs show that, due to the higher MMF harmonic content of concentrated windings, this machine type is characterized by low torque capability and quality, as well as, low efficiency and thermal problems. This paper presents a new fundamental wave FSCW with sinusoidal MMF waveform and a non-overlapping winding arrangement. The proposed winding solution consists of...
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