Brushless permanent magnet motor drive systems are candidates for application in both all-electric and hybrid-electric vehicles since they have the potential to offer a cost-effective solution for realising the vehicle power/torque requirements, whilst at the same time being more energy efficient and comprise of a lower mass and volume than other competing technologies for a given rating specification - essential component constraints in these vehicular applications. A particular feature of brushless permanent magnet traction machines is their ability to realise a high peak to continuous torque and/or power duty rating, a performance specification typical of small to medium urban vehicles. The paper discusses the formulation of a design methodology for brushless permanent magnet machines required to realise such a duty specification, where the target performance requirements are derived from a classical linear two axis approach from which it can be shown that a set of machine parameters are necessary to realise the required performance envelope within the volt-ampere constraints of the traction converter supply and silicon.
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