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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...
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...
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...
Magnetic gearbox (MGB) is a contactless magnet-based transmission system that transmits mechanical power between two shafts. MGBs offer significant advantages over mechanical gears such as contactless power transfer, high gear ratios, inherent overload protection, high torque density, potential for high efficiency, and maintenance free. Cogging torque minimization is a challenging design aspect and...
Recently, the cogging torque in electric motors has been drastically decreased as designers and manufacturers have developed better understanding of the cogging phenomenon. The paper presents a design methodology for cogging torque reduction by an appropriate shaping of stator poles in a Brushless DC Permanent Magnet (BLDCPM) Motor. Cogging torque waveforms, along with other relevant characteristics...
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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