Investigation on Operational Envelops and Efficiency Maps of Electrically Excited Machines for Electrical Vehicle Applications


In this paper, the operational envelops and efficiency maps of an electrically excited (EE) machine with/without using flux weakening control via armature current and/or with/while not the sector excitation regulating are obtained and comprehensively compared for electrical vehicle applications. It shows that even in EE machines, only using the sector excitation regulating however without the flux weakening armature current control, the most power at high speed isn't constant however inversely proportional to the machine speed. Solely by using the flux weakening armature current control, the utmost constant power operation at high-speed region can be achieved whereas the operational high-speed region will be greatly extended. The most potency during this extended high-speed region will be achieved when both the sector excitation and flux weakening $d$ -axis armature current change proportionally. The main benefit of the sphere excitation regulating is that the efficiency in low-torque region will be considerably improved. All the analyses are validated analytically.

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