Bulent Sarlioglu

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This paper presents a new power electronic topology that aims to reduce switching losses in hard-switched inverters for brushless dc (BLDC) motor drives. This is achieved by extending the benefits of synchronous rectification used in low-voltage switch-mode dc-dc conversion to high-voltage motor drive applications and by minimizing the reverse conduction(More)
This paper presents the nonlinear modeling and simulation of a newly conceived doubly salient permanent magnet (DSPM) generator. Since a DSPM machine is highly nonlinear like a switched reluctance machine, utilization of generalized machine theory or lumped parameter modeling is not applicable. Utilization of first order approximations for inductance and(More)
With low loss, fast switching speed, and high-temperature capabilities, silicon carbide (SiC)-based devices are beneficial to automotive power converters in terms of efficiency increase and size reduction. Nevertheless, as a result of fast switching transitions and low on-state resistance of SiC devices, SiC-based converters are prone to overshoots and(More)
Electric and hybrid vehicles continue to demand a considerable share of the automotive market. This movement has been enabled by the recent technological improvements in the areas of electric motors, power electronics, and energy storage. While many electric vehicles (EVs) are on the market, they are not as cost competitive as conventional vehicles, and(More)
This research attempts to find a new closed-form solution for axial flux permanent-magnet (AFPM) machines and applies it in a traction application example. The machine types considered are with toroid and overlapping windings. The proposed closed-form solution includes analytical derivations for winding lengths, resistances, and inductances as functions of(More)
The adoption of silicon carbide (SiC) MOSFETs in variable speed drives (VSDs) makes it possible to increase the inverter switching frequency up to several hundred kilohertz without incurring excessive inverter loss. As a result, the harmonic currents and related losses in the machine can be significantly reduced, and the dynamic performance of motor will(More)
Gallium Nitride (GaN) based power switching devices are known to be superior to conventional Si devices due to properties such as low loss and fast switching speed. However, as a new technology, some special characteristics of GaN-based power devices still remain unknown to the public. This paper tries to investigate the effect of dead-time on a GaN-based(More)
The purpose of this paper is to characterize the performance of a novel dual-stator six-slot four-pole (6/4) flux-switching permanent magnet (FSPM) machine. The proposed dual-stator 6/4 FSPM machine topology eliminates even-order harmonics in the flux linkage and back-electromotive force, which exist in the conventional single-stator single-rotor topology.(More)