Abstract
In this paper, power distribution between the inner and outer machines of a co-axial dual-mechanical-port flux-switching permanent magnet (CADMP-FSPM) machine is investigated for fuel-based extended range electric vehicle (ER-EV). Firstly, the topology and operation principle of the CADMP-FSPM machine are introduced, which consist of an inner FSPM machine used for high-speed, an outer FSPM machine for low-speed, and a magnetic isolation ring between them. Then, the magnetic field coupling of the inner and outer FSPM machines is analyzed with more attention paid to the optimization of the isolation ring thickness. Thirdly, the power-dimension (PD) equations of the inner and outer FSPM machines are derived, respectively, and thereafter, the PD equation of the whole CADMP-FSPM machine can be given. Finally, the PD equations are validated by finite element analysis, which supplies the guidance on the design of this type of machines.
Highlights
With the comprehensive recognition of the global warming as well as emission devastating effects, and the awareness of the fact that the demand for oil increases despite fossil flues resources limitations,[1] enormous efforts are invested in development of pure electric, hybrid, and extender-based hybrid vehicles.[2,3,4] The pure electric vehicle (PEV) features zero emissions, whilst the disadvantages of high price and low energy density
As the main power of the hybrid electrical vehicle (HEV) is provided by internal combustion engine (ICE), the effects of the energies saving and emissions reduction are rather limited.[6,7]
Unlike HEVs, the ICE in extended range electric vehicle (ER-EV) is directly connected to a generator, and operates at a constant speed to drive the generator to charge the battery packs, which indirectly drives the traction motor and the the vehicle
Summary
With the comprehensive recognition of the global warming as well as emission devastating effects, and the awareness of the fact that the demand for oil increases despite fossil flues resources limitations,[1] enormous efforts are invested in development of pure electric, hybrid, and extender-based hybrid vehicles.[2,3,4] The pure electric vehicle (PEV) features zero emissions, whilst the disadvantages of high price and low energy density. The energy storage technology in battery packs in particular is still the bottleneck preventing the widespread of PEVs.[5] the hybrid electrical vehicle (HEV) features high endurance ability and high power density. The power system of the fuel-based extended-range electric vehicle (ER-EV) is comprised by battery packs, a traction motor, a generator and an ICE. Unlike HEVs, the ICE in ER-EVs is directly connected to a generator, and operates at a constant speed to drive the generator to charge the battery packs, which indirectly drives the traction motor and the the vehicle. The inner FSPM machine works as a generator to charge the batteries, which provide energy to the outer FSPM machine to drive the vehicle. It is important to study the power distribution between the inner and outer machines, which is the key for the design of this kind of machines used for ER-EVs given a specific volume
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