Straddle Carrier Electric Powertrain Optimization
Kukkaro, Juuso (2017)
2017
Sähkötekniikka
Tieto- ja sähkötekniikan tiedekunta - Faculty of Computing and Electrical Engineering
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Hyväksymispäivämäärä
2017-12-07
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201711222220
https://urn.fi/URN:NBN:fi:tty-201711222220
Tiivistelmä
This thesis concentrates on improving the energy efficiency of a straddle carrier by optimizing the electrical powertrain. Mobile working machines have significantly varying power demands in operation. Average demand is considerably lower than the maximum power requirements. This results in the machine operating far from its optimum efficiency range significant amount of its operating hours. This work cycle power level variation is vastly different from road vehicle power demands and optimization scenarios. Diesel powered working machine efficiency can be significantly improved with electric hybridization.
The study is beneficial to both direct electric driven and hybrid systems. Main focus is the optimizing the motor and generator with the analysed load cycles. Comprehensive measurement data sets of vehicle use in real port operations are used as a base for the load analysis. In conjunction with the load models several mechanical and electrical simulation models were created. These component models were used to estimate changes that different motor and generator combinations would have on the overall efficiency. For this the efficiency maps for electrical machines are determined analytically in the whole torque–rotational speed plane based on the electrical machine parameters.
Electrical machine losses and torque generation were studied in depth to find appropriate future development paths for the electrical powertrain of a straddle carrier. Additionally the payback time for the most feasible improvements were estimated. The thesis provides a case example of dimensioning and improving electrical powertrain of a working machine.
The study is beneficial to both direct electric driven and hybrid systems. Main focus is the optimizing the motor and generator with the analysed load cycles. Comprehensive measurement data sets of vehicle use in real port operations are used as a base for the load analysis. In conjunction with the load models several mechanical and electrical simulation models were created. These component models were used to estimate changes that different motor and generator combinations would have on the overall efficiency. For this the efficiency maps for electrical machines are determined analytically in the whole torque–rotational speed plane based on the electrical machine parameters.
Electrical machine losses and torque generation were studied in depth to find appropriate future development paths for the electrical powertrain of a straddle carrier. Additionally the payback time for the most feasible improvements were estimated. The thesis provides a case example of dimensioning and improving electrical powertrain of a working machine.