Bosch Active Line 3 printed circuit board explained

For my solar powered bicycle, the Maxun One, I designed a very powerful and lightweight mid-drive motor. I also wanted to investigate whether I could use a Bosch Active Line 3 motor. The Bosch motor weight is 2975g, this is relatively lightweight for a mid-drive motor, but it is still too heavy for my solar bike.

Bosch Active Line 3 printed circuit board explained

 

Bosch Active Line 3 printed circuit board taken apart

Note that the SMD components are soldered with a very high quality, comparable to that of smartphones.
Instead of varnishing the whole PCB, this has only been done locally.

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