New stronger and lighter Bafang Max motor

[1boris]

http://www.bafang-e.com/en/components/component/motor/mm-g120220.html

http://www.bike-eu.com/home/nieuws/2017/8/bafang-introduces-m500-mid-motor-for-e-mtbs-10130989

 

[Deleted member 4366]

Provision for private labelling? Both the 250w and 500w make 110Nm torque? Hello!

 

[Woosh]

Provision for private labelling? Both the 250w and 500w make 110Nm torque? Hello!

it's possible. The extra Watts may go in spinning the motor faster while having the same max torque.
BTW, it's very difficult to spot that you run a 48V kit instead of 36V kit.

 

[Deleted member 4366]

Did you notice the QR cassette hub-motor in the video? It would be great if they make a smaller version of that -say about 2kg.

 

[Woosh]

now you mentioned it:

perfect water proofing!
but I can't see how you are going to open it...
Bafang seem to push 43V systems.

 

[Deleted member 4366]

A QR motor needs a way to resist the torque. I wonder how they do it?

43v is 12S, which goes to 50.4v when fully charged. That's still over 48v, so if it's allowed, so should a 13S 48v one. I'd love to get this bottomed out because I've heard so many different things from different sources. KTM had a 13S 48v battery in their Panasonic bikes, but they've droped them now.

 

[Woosh]

I think 12S is legal because the EN15194 specs are for battery at nominal voltage (43V).

A QR motor needs a way to resist the torque. I wonder how they do it?

where the cable comes out, the shape looks like it can act as anti-rotation device at the same time. Bafang may have designed the hangers for their new motor - who knows.

 

[Deleted member 4366]

I think 12S is legal because the EN15194 specs are for battery at nominal voltage (43V).

So is a 13S 48v battery then because its nominal voltage is 46.8v. That's why KTM and Panasonic called it a 46v battery.

 

[Woosh]

So is a 13S 48v battery then because its nominal voltage is 46.8v. That's why KTM and Panasonic called it a 46v battery.

thank you for the tip.
may be I should call my 48V kits 46V too.

 

[anotherkiwi]

My version of EN15194 says:

"This European Standard specifies requirements and test methods for engine power management systems, electrical circuits including the charging system for the assessment of the design and assembly of electrically power assisted cycles and sub-assemblies for systems having a voltage up to and including 48 VDC..."

A 12S Lipo charged to 4 V per cell is legal, all you need for Li-Ion is a charger that balances at 4 V per cell. You lose so little capacity between 4.2 V and 4 V that I am surprised no one has commercialised such a solution. Of course Tesla charges to 4 V per cell according to online docs.

 

[Deleted member 4366]

"This European Standard specifies requirements and test methods for engine power management systems,"

It specifies some requirements, but not the important ones. Hardly anything is tied down. The main question is whether the 48v means absolutely 48v max or a 48v system. Most people wouldn't understand the intricacies of battery management. They'd ask the question "what voltage is it?" reply "48v" - allowed.

 

[1boris]

"This European Standard specifies requirements and test methods for engine power management systems,"

It specifies some requirements, but not the important ones. Hardly anything is tied down. The main question is whether the 48v means absolutely 48v max or a 48v system. Most people wouldn't understand the intricacies of battery management. They'd ask the question "what voltage is it?" reply "48v" - allowed.

I dont understand this sudden question if 48volt are legal or not.There are many 48v oem bikes tht are legal

 

[Quator94]

Did you notice the QR cassette hub-motor in the video? It would be great if they make a smaller version of that -say about 2kg.

Yeah, that would be awesome

 

[Rohloffboy]

That new crank drive from Bafang looks very promising, I like that it is using isis interface for the cranks, I am a big fan of the isis interface having adopted it for my none ebike back in 2004, as it makes chain alignment for my Rohloff more accurate than the Square Taper type interface.

Also Bafang are looking to produce 2170 Cell battery backs, rather than just 18650 Cell, which is another good move as the 2170 Cell offers higher density and lower cost of manufacture.

Can't wait for these new developments to come to market, as my legs keep telling me I need to go electric!

 

[Georgew]

That new crank drive from Bafang looks very promising, I like that it is using isis interface for the cranks, I am a big fan of the isis interface having adopted it for my none ebike back in 2004, as it makes chain alignment for my Rohloff more accurate than the Square Taper type interface.

Also Bafang are looking to produce 2170 Cell battery backs, rather than just 18650 Cell, which is another good move as the 2170 Cell offers higher density and lower cost of manufacture.

Can't wait for these new developments to come to market, as my legs keep telling me I need to go electric!

I'm having difficulty in understanding this. Given that your Rohloff uses a single chain-ring and that the alignment of this with the centre of the cassette can be adjusted by means of the length of the Square taper Bottom bracket, what increased accuracy could be required?

It might be just me that's missing something of course.