The electric variable transmission

Hoeijmakers, M.J.; Ferreira, J.A.

doi:10.1109/tia.2006.877736

Cited by 167 publications

(64 citation statements)

References 11 publications

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“…In order to reduce the system weight and size, a combination of two concentric electric machines can be used as a power split device, instead of the planetary gear set [4]. Also, in addition, special electromechanical converters were developed: the two electric machines are substituted by a single one, with double rotor -the electric variable transmission concept [5], [6].…”

Section: Parallel Hevmentioning

confidence: 99%

A General Overview on Hybrid and Electric Vehicles

Melo¹

2017

neutroaterra

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The Index TermsHybrid and electric vehicles, batteries and fuel cells, energy management systems. IntroductionHEV and EV concepts were first introduced at the end of the XIX century. At that time the main efforts were made to improve the internal combustion engine (ICE) features and the autonomy of electric motor (EM) based vehicles. It should be noted that ICE development was in the beginning, while EM technology was in a much higher level: for instance, braking mode was already available, allowing recover the vehicle kinetic energy and storing it in batteries.That was a major contribution for HEV and EV efficiency and autonomy, which is still a fundamental issue for its development, particularly for the last one [1].In the 1920´s there was a huge evolution in the ICE -higher HEV and EV are bringing new engineering challenges, since several different domains (electric motors, power electronics, energy storage devices, control theory, automobile technology) must be integrated, in order to achieve (at least) drivability performances similar to conventional vehicles.

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Section: Parallel Hevmentioning

confidence: 99%

A General Overview on Hybrid and Electric Vehicles

Melo¹

2017

neutroaterra

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“…(1) The soft-magnetic material (iron) has infinite magnetic permeability μ → ∞; (2) The PMs are axially magnetized with relative permeability μr = 1. Many analytical methods have been proposed for the PM machines without taking into account the slotting effect, and generally focus on the open-circuit field distribution.…”

Section: Analytical Modelingmentioning

confidence: 99%

“…In recent years, double-rotor machines have drawn a wide interest as a possible alternative to the Toyota hybrid system (THS), which enables the internal combust engine (ICE) to operate at the high-efficiency area independent of road conditions [1][2][3][4]. However, the existence of brushes and slip rings may cause problems of low reliability and overheating of inner-rotor windings, which restricts their applications [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Analytical Investigation of the Magnetic-Field Distribution in an Axial Magnetic-Field-Modulated Brushless Double-Rotor Machine

et al. 2016

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Abstract:The axial magnetic-field-modulated brushless double-rotor machine (MFM-BDRM) is a novel possible alternative power-split device for hybrid electric vehicles (HEVs). This paper proposes a two-dimensional (2-D) analytical method to predict the performance of the axial MFM-BDRM to reduce computing time. The computation is based on the solution of Laplace's or Poisson's equation with boundary conditions for each elementary rectangular region. By taking account of the existence of modulating ring and the stator slotting effect, the proposed model is able to calculate magnetic-field distribution with high accuracy. In order to assess the proposed method, the 2-D analytical and three-dimensional (3-D) finite element analysis (FEA) results have been compared, and good agreements have been achieved. As the analytical computation is much faster and more flexible, the proposed method can be used in the preliminary design process of the axial MFM-BDRM.

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“…One of the powertrain system in parallel-series HEVs is the EVT system, which combines two electric machines [5]. The structure particularity of EVTs can make ICE running in its efficiency region.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization of an Electric Variable Transmission for Hybrid Electric Vehicles

Sun

Wang

et al. 2018

Energies

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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.

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The electric variable transmission

Cited by 167 publications

References 11 publications

A General Overview on Hybrid and Electric Vehicles

A General Overview on Hybrid and Electric Vehicles

Analytical Investigation of the Magnetic-Field Distribution in an Axial Magnetic-Field-Modulated Brushless Double-Rotor Machine

Design Optimization of an Electric Variable Transmission for Hybrid Electric Vehicles

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