Hochdrehende E-Antriebseinheit  für die nächste Fahrzeuggeneration

Deiml, Mathias; Eriksson, Tommie; Schneck, Matthias; Tan-Kim, Antoine

doi:10.1007/s35148-019-0045-8

Cited by 3 publications

(1 citation statement)

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“…The limiting speed of bearings is given by the speed factor ndm consisting of the maximum speed n [min −1 ] and the mean diameter of the bearing dm [mm]. In the work of Deiml et al [37] it is mentioned that common SKF bearings are designed with a maximum speed factor of 0.7 × 10 6 mm/min, but for their high-speed approach sealed bearings with a speed factor of 1.6 × 10 6 were designed. Usually, spindle bearings (super precision angular ball bearings) according to DIN 628-1 [38] are used in machine tools, reaching highest rotational speeds.…”

Section: Operability Of High-speed Transmissionmentioning

confidence: 99%

On the Impact of Maximum Speed on the Power Density of Electromechanical Powertrains

et al. 2020

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In order to achieve the European Commission’s ambitious climate targets by 2030, BEVs (Battery Electric Vehicles) manufacturers are faced with the challenge of producing more efficient and ecological products. The electromechanical powertrain plays a key role in the efficiency of BEVs, which is why the design parameters in the development phase of electromechanical powertrains must be chosen carefully. One of the central design parameters is the maximum speed of the electric machines and the gear ratio of the connected transmissions. Due to the relationship between speed and torque, it is possible to design more compact and lighter electric machines by increasing the speed at constant power. However, with higher speed of the electric machines, a higher gear ratio is required, which results in a larger and heavier transmission. This study therefore examines the influence of maximum speed on the power density of electromechanical powertrains. Electric machines and transmissions with different maximum speeds are designed with the state-of-the-art for a selected reference vehicle. The designs are then examined with regard to the power density of the overall powertrain system. Compared to the reference vehicle, the results of the study show a considerable potential for increasing the power density of electromechanical powertrains by increasing the maximum speed of the electric machines.

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Section: Operability Of High-speed Transmissionmentioning

confidence: 99%

On the Impact of Maximum Speed on the Power Density of Electromechanical Powertrains

et al. 2020

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Getriebe

Küçükay

2022

Grundlagen Der Fahrzeugtechnik

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Numerical and experimental investigations on the vibration behavior of a high-speed planetary gearbox

Schweigert,

Morhard,

Oberneder

et al. 2024

Forsch Ingenieurwes

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Increasing the speed of the electric motor can significantly improve the power density of the powertrain of EVs (Electric Vehicles), resulting in a smaller size and thus weight and cost advantages. Achieving acceptable NVH behavior becomes more difficult at higher speeds, partly because the excitation frequencies of the gears cover a wider frequency range and therefore higher natural frequencies can also be directly excited. In the Speed4E joint research project, a high-speed electromechanical powertrain was developed, manufactured, and tested to investigate the main challenges on the NVH- and efficiency-behavior of high-speed powertrains. The high-speed design of the Speed4E drivetrain results in maximum electric motor speeds of up to 50,000 rpm, combined with a torque of up to 45 Nm at the transmission input shafts. This study presents the experimental results on the vibration behavior of the high-speed planetary gearbox, a comparison with the corresponding results of a highly efficient calculation method of the gearbox vibration excitation, and the theoretical background of the calculation method is presented. The results indicate the potential to improve the vibration behavior of high-speed drives in EVs and provide a deep understanding of the challenges associated with high speeds.

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Hochdrehende E-Antriebseinheit für die nächste Fahrzeuggeneration

Cited by 3 publications

References 0 publications

On the Impact of Maximum Speed on the Power Density of Electromechanical Powertrains

On the Impact of Maximum Speed on the Power Density of Electromechanical Powertrains

Getriebe

Numerical and experimental investigations on the vibration behavior of a high-speed planetary gearbox

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