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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...
Using PWM converters to control electrical machines brings many benefits, such as improved dynamic behavior and energy savings, but also introduces a current ripple, which induces additional losses in the machine. This paper investigates the extent of these losses in the rotor, windings and laminations of a PM machine as function of switching frequency and dc-link voltage by means of a case study...
Five promising permanent magnet (PM) machine configurations, namely machine 1 with 24-slot/16-pole, machine 2 with 27-slot/18-pole, machine 3 with 24-slot/20-pole, machine 4 with 24-slot/28-pole and machine 5 with 27-slot/24-pole are compared to find out the best one for a small ship application. A nonlinear two-dimensional finite element analysis including rotor motion is developed for this study...
High speed electrical machines are replacing existing subsystems in aircraft. Electrical drives need to have high availability and good power density to be considered a viable replacement. To achieve high availability fault tolerance is added to the system design. Power density is increased by spatial integration of subparts. Fault tolerance extends to both machine and power electronics design. By...
This paper studies distribution of eddy currents and eddy current losses in the rotor of concentrated winding exterior rotor permanent magnet machines in flywheels. The two-dimension nonlinear transient finite element method (FEM) model including rotor motion was used. Influence of slot opening on the eddy current loss in magnets and rotor back iron is investigated. Segmented magnets for reducing...
Permanent Magnet machines have a high force density and high efficiency. These machines can be made cost effective by using fractional-pitch windings as the fabrication of such windings can be automated. However, one big challenge to design such machines is to analyze the eddy-current losses, specifically in solid back-iron of the rotor/translator and magnets. This paper compares analytical calculation...
The Distributed Power Flow Controller (DPFC) is a new device within the FACTS family. It is emerged from the UPFC and has relatively low cost and a high reliability. The DPFC consists of two types of converters that are in shunt and series connected to grids. The common dc link between the shunt and the series converters is eliminated. The active power exchange between the shunt and series converters...
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