Design and comparison of interior permanent magnet synchronous motors with non‐uniform airgap and conventional rotor for electric vehicle applications

Abstract

In recent years, electric mobility is becoming a growing reality because of the increase of the oil demand and cost as well as the environmental effect of the conventional internal combustion engines. Since about a decade, in the USA, a publicprivate cooperative research initiative, called FreedomCAR (US Drive by mid 2012) has been working for developing high efficiency and cost competitive technologies for the electrification of private transport. This research presents the design and the comparison of two high performance, radial magnetisation, interior permanent magnets and synchronous motors, according to the FreedomCAR targets, equipped with different rotor shape geometries. The first is characterised by a nonuniform airgap, whereas the second presents a conventional rotor shape. Both the machines are equipped with the same stator and a fractional slot concentrated winding. This paper highlights the benefits for using a non-uniform airgap rotor design, especially concerning the efficiency, that represents the most difficult target to be satisfied.

Dynamics of the fractional‐order chaotic PMSG, its stabilisation using predictive control and circuit validation

“…From(14), we already have k , 0 and k = −1 and we have proved above that k , k. Thus, if k [ (−1, k), where k satisfies (16) then the equilibrium point E i of the controlled incommensurate system (15) is locally asymptotically stable.…”

Design Approaches and Control Strategies for Energy-Efficient Electric Machines for Electric Vehicles—A Review

“…In [79] a non-uniform airgap geometry reduces the effect of the MMF harmonics on the iron losses, which are decreased by up to 50% at high speeds, with respect to a conventional machine with a uniform airgap.…”

Fast and Accurate Model of Interior Permanent-Magnet Machine for Dynamic Characterization

“…Permanent-magnet synchronous machines excel in high torque density and high efficiency, so they have been widely investigated in recent years [1][2][3]. From the two permanent-magnet synchronous-machine topologies, i.e., surface permanent-magnet machines (SPM) and interior permanent-magnet machines (IPM), the latter are especially suitable for transport applications, where a wide speed range is a key requirement [4,5].…”