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The axial-flux permanent-magnet machine (AFPM) topology is suited for direct-drive applications and, due to their enhanced flux-weakening capability, AFPMs having slotted windings are the most promising candidates for use in wheel-motor drives. In consideration of this, this paper deals with an experimental study devoted to investigate a number of technical(More)
This paper presents the design, finite-element (FE) analyses and experimental validation of a Kaman-type fractional-slot concentrated-winding axial-flux permanent-magnet machine with tooth-wound coils. In this particular topology, the flux travels axially through the permanent magnets, from one stator to the opposite, so that there is no need for any rotor(More)
This paper presents a gearless wheel motor drive system specifically designed for fuel cell electric and hybrid electric vehicle propulsion application. The system includes a liquid-cooled axial flux permanent-magnet machine designed to meet the direct-drive requirements. The machine design implements techniques to increase the machine inductance in order(More)
The search for a compact, lightweight, and efficient energy storage system (battery and/or combination of other emerging technologies, including ultracapacitors, flywheel energy storage system, advanced batteries, and fuel cells) that is both affordable and has acceptable cycle life remains the major roadblock to large-scale production of EVs and HEVs. In(More)
In hybrid electric vehicle (HEV) drivetrains an electrical generator is coupled onto the shaft of an internal-combustion engine (ICE) in order to process either the entire or a given fraction of the traction power required by the vehicle wheels. As such an ICE-driven generator is being confined within the vehicle hood and is exposed to heating resulting(More)
As consequence of the considerable increase of the electrical power demand in vehicles, the adoption of a combined direct-drive starter/alternator system is being seriously pursued and a new generation of vehicle alternators delivering power up to 6 kW over the entire range of the engine speed is soon expected for use with connection to a 42 V bus. The(More)
The aim of this paper is to present a solution for active output voltage regulation in permanent-magnet (PM) automotive alternators, through mechanical flux weakening. An axial-flux PM ironless machine is investigated, which is composed of two stators connected in series which can be shifted one with respect to the other, thus allowing a theoretically(More)