Technical Concept Study of an Electric Motorcycle Powertrain
Examensarbete för masterexamen
Mobility engineering (MPMOB), MSc
During the last few years, the market for electric motorcycles has expanded and many new manufacturers have entered the market. The Swedish motorcycle producer RGNT Motorcycle is currently producing A1 motorcycles and would like to investigate powertrain options for a more powerful electric motorcycle with comparable performance to a conventional internal combustion engine motorcycle. This master’s thesis aims to provide RGNT with a technical concept study of an electric motorcycle powertrain based on the principles of product development and mechanical engineering. The thesis work began with defining the problem, benchmarking competitors and making a functional analysis to gain better knowledge and understanding of electric motorcycle powertrains. The initial design targets and requirements were then set together with engineers at RGNT Motorcycles and compiled into a requirement specification sheet. Calculations and simulations were made in order to define the specifications of the powertrain based on the performance targets from the requirement specification sheet. Overall dimensions and motorcycle parameters that were needed for evaluations were compiled from existing motorcycles and relevant literature. Different types of motors, primary- and final transmissions were combined to generate feasible concepts. The concepts were evaluated using elimination and Kesselring matrices as well as packaging models in CAD. The number of concepts was gradually reduced until three remained. It was concluded that a PMSM (Permanent Magnet Synchronous Machine) axial flux motor with a belt drive would fit the motorcycle best. Initial mechanical design and CAD modelling of the final transmission and swingarm were made. It was also found that the most suitable powertrain configuration is largely dependent on the motor and inverter used and further work with souring these components was recommended.
Electric Motorcycle, Powertrain, Drive Cycle Simulation, Product Development.