Comparison of effect on motor among 2-, 3- and 4-speed transmission in electric vehicle

Fang, Yuhong; Ruan, Jiageng; Walker, Paul; Zhang, Nong

doi:10.1109/icmech.2017.7921150

Cited by 8 publications

(3 citation statements)

References 8 publications

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“…The comparison of the single-speed and two-speed transmission systems, shown in Figure 10, demonstrates that they differ in the number of gears. Although increment of the number of gears leads to the increase of the mechanical losses in transmission system, the overall efficiency of the machine in the presence of multi-speed transmission system is higher [144]. This improvement of the efficiency resulted from the operation of the electric machine in the field weakening region where its efficiency is higher.…”

Section: Transmission System (Mechanical Drivetrain) Lossesmentioning

confidence: 99%

“…Literature shows the significance of the speed in determination the transmission system efficiency [153] in comparison to the role of other factors. It has been shown that the maximum efficiency of the transmission systems is not higher than 95% [144,153]. Thus, this portion of the loss must not be ignored when the total efficiency of an EV is studied.…”

Section: Loss and Efficiency In The Single And Multi-speed Transmission Systemsmentioning

confidence: 99%

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Losses in Efficiency Maps of Electric Vehicles: An Overview

et al. 2021

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In some applications such as electric vehicles, electric motors should operate in a wide torque and speed ranges. An efficiency map is the contour plot of the maximum efficiency of an electric machine in torque-speed plane. It is used to provide an overview on the performance of an electric machine when operates in different operating points. The electric machine losses in different torque and speed operating points play a prominent role in the efficiency of the machines. In this paper, an overview about the change of various loss components in torque-speed envelope of the electric machines is rendered to show the role and significance of each loss component in a wide range of torque and speeds. The research gaps and future research subjects based on the conducted review are reported. The role and possibility of the utilization of the computational intelligence-based modeling of the losses in improvement of the loss estimation is discussed.

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Section: Transmission System (Mechanical Drivetrain) Lossesmentioning

confidence: 99%

Section: Loss and Efficiency In The Single And Multi-speed Transmission Systemsmentioning

confidence: 99%

Losses in Efficiency Maps of Electric Vehicles: An Overview

et al. 2021

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“…However, under conditions of different routes, the requirements of the quantity of speeds are different. 10 A new all-electric vehicle layout was developed, including two powertrains, each of which included a two-speed transmission for improving vehicle acceleration and grade ability. [11][12][13] Therefore, the development of electric vehicle transmission systems has become a trend.…”

Section: Introductionmentioning

confidence: 99%

Parameters optimization of two-speed powertrain of electric vehicle based on genetic algorithm

Zhu

Zhang

et al. 2014

Advances in Mechanical Engineering

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Aiming at the shortcomings of only optimizing the gear ratios of two-speed transmission in the optimization process of two-speed powertrain parameters of electric vehicles, the optimization of two-speed powertrain parameters of electric vehicles based on genetic algorithm is proposed. The optimization process is to optimize the main performance parameters of the drive motor and the gear ratios of two-speed transmission. That is, taking the economy and dynamic of the electric vehicle as the fitness function, the gear ratios of two-speed transmission is optimized under the main performance parameters of different drive motors, so as to find the powertrain parameter with the best fitness function value. Among them, the AMESim software is used to build the vehicle optimization model, the genetic algorithm is improved by MATLAB, and the improved genetic algorithm is used to optimize the vehicle optimization model. The results show that the optimization of the vehicle’s economic and dynamic performance has been improved, indicating that this optimization method is effective.

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