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Energy storage systems have become an essential pillar in most of electrical engineering applications due to introduced technical and economical merits, particularly following the pronounced grid-integration of renewable energy sources. Flywheel Energy Storage Systems (FESSs) have emerged as reliable and cost effective short term storage system. FESS may be used for critical load support or fault...
This paper proposes a novel single layer winding layout for a permanent magnet machine with improved torque density for electric vehicle applications. In this paper, two permanent-magnet (PM) machines with outer rotors and single layer fractional slot concentrated windings are compared based on two different slot/pole combinations, namely 20 slots/18 poles and 20 slots/22 poles. The two machines are...
Three-phase current source inverter (CSI)-based induction motor (IM) drives are attractive in MV applications since they feature a simple inverter structure, a lower switching dv/dt, and a reliable short circuit protection. Although multiphase machine topic, especially the five-phase one, gains considerable interest recently in literature, almost all the applied control methods are targeting voltage...
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...
Energy storage systems have become an essential part of power utilities due to their capability of providing high level of power quality and stability. Flywheel energy storage systems (FESSs) are now employed with numerous grid and renewable energy applications due to their operational merits. Some of these applications are related to fault ride-through and critical load support. Therefore, the reliability...
Permanent magnet (PM) vernier machines have shown promise in electric vehicle applications as they offer high torque density and low speed/high torque operation by introducing flux-modulation poles that modulate the high-speed armature rotating field and the low-speed PM rotor field. The non-overlap single layer windings provide a cost-effective design variation that eases manufacturing, reduces torque...
Recently, magnetic gearboxes (MGBs) are attracting more followers as they offer great benefits over conventional mechanical gearboxes including contactless operation, lower noise, lower vibration, and they are maintenance-free. Improving MGBs performance is one of the popular topics under research. Axial MGB is one of the magnetic gear topologies that is suitable for applications which require a physical...
Multiphase induction machine is normally controlled using rotor field oriented vector control. Under phase(s) loss, the machine currents can be optimally controlled to satisfy certain optimization criteria. In this paper, a vector control scheme to a five-phase induction machine is introduced to ensure equal phase currents and minimum torque ripples under a phase open circuit. The controller idea...
Energy storage is becoming a basic component of modern renewable power plants, especially wind farms. For several considerations, local wind turbine (WT) energy storage is preferred. Flywheel energy storage is among the most promising storage systems regarded for wind applications. This paper proposes a new architecture for flywheel energy storage based on doubly fed induction machine (DFIM) where...
Mechanical gearboxes are typically employed with doubly-fed induction generator based wind turbines to convert the turbine's low speed mechanical power into high-speed mechanical power to drive the electrical generator. The main drawback of this solution is the gearbox's reliability and maintenance. Direct-drive wind turbines, on the other hand, employ a large volume and weight permanent magnet generator...
The performance of fault-tolerant modular PM machines depends on the proper selection of the pole and slot numbers which results in negligible coupling between phases. The preferred slot and pole number combinations eliminate the effect of low order harmonics in the stator MMF and thereby the vibration and stray loss are reduced. In this paper, three machines, with an external rotor design and identical...
This paper addresses the physical modeling and identification of Torque Motor based mechatronic actuators used in the air path of the engine of a Drive-by-Wire automobile. The torque motor has non-linear torque characteristics with respect to the rotor position due to its mechanical construction. A study based on two Pancake DC Torque motors has been carried out with two motors of different stator...
This paper presents the design, analysis, and realization of a magnetic planetary gearbox used in a compact harsh environment typical of oil well logging tools. Such tools are subjected to temperatures in excess of 175°C as well as severe shock and vibration. The tools are typically oil filled, and include fine pitched oil filters to prevent clogging of the fluid communication lines. Mechanical gear...
This paper presents an investigative study on the effect of an asymmetrical stator pole arc length and its relationship with the rotor pole width in single phase Permanent Magnet Brushless DC (PM BLDC) Motors. Employing an asymmetrical stator pole design influences the shape of the trapezoidal back EMF. This paper presents the work done in determining the optimum stator/rotor pole arc ratio that will...
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