Abstract
An electric variable transmission (EVT) for hybrid electric vehicles (HEVs) is investigated in this paper. With a special double rotor structure, the EVT splits and reintegrates the output power of the internal combustion engine (ICE) to run at its optimum working efficiency. However, the high electromagnetic coupling degree causes torque ripple and affects the dynamic performance of the EVT. After introducing the configuration and working principle, the torque mathematical model of the EVT in an ABC three-phase coordinate system is proposed to analyze the cause of this torque ripple. Besides, a finite element method-based (FEM) structural optimization design for reducing the torque ripple and improving the working stability is presented. The magnetic field distribution, induced voltage and torque property validate the rationality of optimization.
Highlights
In recent years, with the rapid development of industry and the continuous increase of population, the “energy crisis” has become an urgent problem that needs to be solved immediately, new-energy vehicles came into being [1]
It produces a large number of harmonic components in the air-gap to modulate the magnetic field distribution and transfer electromagnetic energy; (3) Studying the effect of the iron core material and lamination method on the magnetic flux fluidity to reduce the degree of mutual interference between the inner and outer magnetic field of the electric variable transmission (EVT)
This paper studies the operation stability of EVTs used for hybrid electric vehicles (HEVs)
Summary
With the rapid development of industry and the continuous increase of population, the “energy crisis” has become an urgent problem that needs to be solved immediately, new-energy vehicles came into being [1]. The magnetic field modulation ring adopts the magnetic block to change the air-gap magnetic conductance based on the flux-modulated effect It produces a large number of harmonic components in the air-gap to modulate the magnetic field distribution and transfer electromagnetic energy; (3) Studying the effect of the iron core material and lamination method on the magnetic flux fluidity to reduce the degree of mutual interference between the inner and outer magnetic field of the EVT. The high degree of electromagnetic coupling between the inner and outer magnetic field causes torque ripple, reducing the running stability of HEVs. to analyze the reason for torque ripple, a torque mathematical model of an EVT in an ABC three-phase coordinate system is proposed. The magnetic field distribution, induced voltage and torque properties validate the rationality of the structural design optimization, which reduces the torque ripple of EVT to an acceptable range to guarantee the running stability of HEVs
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