Bosch Active Line 3 mid-drive motor tear down

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avandalen   10 W

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Bosch Active Line 3 mid-drive motor tear down

Post by avandalen » Sep 08 2018 9:50am

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
Image

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

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robbie   100 mW

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

Post by robbie » 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?

SlowCo   10 kW

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

Post by SlowCo » Sep 09 2018 7:17pm

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.

casainho   100 MW

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

Post by casainho » Sep 13 2018 4:56am

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!!
Developer of the Flexible OpenSource firmware for EBike motor controllers (TSDZ2 and KT) and LCDs (KT-LCD3 and Bafang 850C color LCD).

If you like my work, you can consider making a donation. I am being using the donations to buy needed resources for my developments. My paypal: casainho AT gmail.com.

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avandalen   10 W

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

Post by avandalen » Sep 21 2018 9:51am

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)

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