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Bosch Active Line 3 mid-drive motor tear down

Posted: Sep 08 2018 9:50am
by avandalen
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.

So, I wanted to investigate if the Bosch motor can be reduced in weight, so I disassembled the motor. This is also a great opportunity to see how it works and which electronic parts are used.

See the whole article here:
http://www.avdweb.nl/solar-bike/hub-mot ... ine-3.html

What is striking after opening the motor is that there are only a few parts inside, that is a great achievement of the Bosch engineers:Image
Image
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See the whole article here:
http://www.avdweb.nl/solar-bike/hub-mot ... ine-3.html

Re: Bosch Active Line 3 mid-drive motor tear down

Posted: Sep 09 2018 12:59pm
by robbie
A great tear down, and fantastic website by the way.

Have you figured out where you can remove any material to lighten the product up?

Re: Bosch Active Line 3 mid-drive motor tear down

Posted: Sep 09 2018 7:17pm
by SlowCo
Beautiful engineering from Bosch and a nice tear down from you.
Some other light weight mid drives:
viewtopic.php?f=28&t=95704
https://www.gngebike.com/ultralight-300w-kit

And please show your own design here also.

Re: Bosch Active Line 3 mid-drive motor tear down

Posted: Sep 13 2018 4:56am
by casainho
avandalen, thanks for sharing!!

Really good to see the Bosch technology and compare to cheap chinese options like TSDZ2 mid drive motor: https://github.com/OpenSource-EBike-fir ... _wiki/wiki

Sure Bosch technology is more advanced but from the perspective of using the motor to other applications like hand bicycles, repair, DIY and having/owning knowledge about motor technology, cheap chinese like TSDZ2 mid drive motor is the way to go!!

Re: Bosch Active Line 3 mid-drive motor tear down

Posted: Sep 21 2018 9:51am
by avandalen
robbie wrote:
Sep 09 2018 12:59pm
A great tear down, and fantastic website by the way.

Have you figured out where you can remove any material to lighten the product up?
No it is not possible.
I will switch to a Shimano Steps E8000 (2.88kg) or Brose mid drive motor (2.9kg in 2019)

Re: Bosch Active Line 3 mid-drive motor tear down

Posted: May 21 2019 7:45am
by avandalen
See the article about the motor graph here:
Image
https://endless-sphere.com/forums/viewt ... 0&t=100180