In case anyone needs a reference for designing an electric bicycle, check out this very good and very detailed online ebook :
https://studylib.net/doc/25696995/electric-bicycles-a-guide-to-design-and-use
You will notices that the vast majority of the book is given to these subjects :
Where most of these are purely electric and electronic, but motors is electro-mechanical, but requires a deep understanding of the usage model as well as the performance and distance trade-offs related to the limits of the battery capacity.
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