2wd Riese & muller

[Jandekoffieman]

Hi guys,

My name is jeff and living in holland. I've got a Riese & muller blue label charger 45km/u, with a 350w mid engine. I bought the bike back in march 2016 and off today I cycled just over 75.000km. Due to my changing work-situation i want to reduce my cycling time each day. I cycle aprox. 100 km a day which kost me about 3 hours (incl. Changing clothes etc).

therefore i recently bought a fronthub engine 500wh 8fun bafang with controller and display. Link:

Bafang 36V 48V 500W Freehub bruchless Geared Hub Motor 20", 24", 26", 27.5”, 28”, 29er, 700C Vorderrad Umbausatz Kits : Amazon.de: Sport & Freizeit

Bafang 36V 48V 500W Freehub bruchless Geared Hub Motor 20", 24", 26", 27.5”, 28”, 29er, 700C Vorderrad Umbausatz Kits : Amazon.de: Sport & Freizeit

www.amazon.de

Combined with a 48v - 17,5 A hailong batterie.

Everything is installed properly but i got the following situation:
From 0-40km/u the front hub engine produces power. Off course at starts-up till about 35 km/h the system produces about 800-1000 watts, says my display. Above 35km/h the wattage starts to drop. When i drive 45 km/h the wattage is just around 50 watss. When i cycle to 46 the wattage is completly gone. It feels like a limiter. Did i do something wrong in the programming or is there a component of this system which has limitations?

i hope you guys could help me out!

thank a lot!

grtz Jeff

 

[Deleted member 25121]

Hi guys,

My name is jeff and living in holland. I've got a Riese & muller blue label charger 45km/u, with a 350w mid engine. I bought the bike back in march 2016 and off today I cycled just over 75.000km. Due to my changing work-situation i want to reduce my cycling time each day. I cycle aprox. 100 km a day which kost me about 3 hours (incl. Changing clothes etc).

therefore i recently bought a fronthub engine 500wh 8fun bafang with controller and display. Link:

Bafang 36V 48V 500W Freehub bruchless Geared Hub Motor 20", 24", 26", 27.5”, 28”, 29er, 700C Vorderrad Umbausatz Kits : Amazon.de: Sport & Freizeit

Bafang 36V 48V 500W Freehub bruchless Geared Hub Motor 20", 24", 26", 27.5”, 28”, 29er, 700C Vorderrad Umbausatz Kits : Amazon.de: Sport & Freizeit

www.amazon.de

Combined with a 48v - 17,5 A hailong batterie.

Everything is installed properly but i got the following situation:
From 0-40km/u the front hub engine produces power. Off course at starts-up till about 35 km/h the system produces about 800-1000 watts, says my display. Above 35km/h the wattage starts to drop. When i drive 45 km/h the wattage is just around 50 watss. When i cycle to 46 the wattage is completly gone. It feels like a limiter. Did i do something wrong in the programming or is there a component of this system which has limitations?

i hope you guys could help me out!

thank a lot!

grtz Jeff

Hello and welcome, you certainly ride some long distances there.

I'm not familiar with the motor and hopefully somebody will be able to give some good advice, it's possible that the motor is running out of rpm because of the back emf it's producing.

Did you fit this motor to your R&M bike or a different one?

 

[Nealh]

You have done nothing wrong the hub motor has an ultimate speed, it is dependant on the what the rpm is wound for. I suspect it is less then 230 -250rpm.
On the hub there should be a code marked in between brackets, it might be marked (13), (14) or another code this will tell us the rpm.

As the hub reaches it's max speed (rpm) for the voltage then the current starts to work against it producing bemf (back eletro magnetic force), the faster the hub goes the more bemf counters the speed/voltage and current starts reducing. The bemf protects the copper windings from melting/over heating.

The ultimate hub speed is dependant on the rpm winding code, for what you want 45km/h a higher wound hub with a code ( 9) or (10) is needed to match the mid drive speed.

 

[Jandekoffieman]

Hello and welcome, you certainly ride some long distances there.

I'm not familiar with the motor and hopefully somebody will be able to give some good advice, it's possible that the motor is running out of rpm because of the back emf it's producing.

Did you fit this motor to your R&M bike or a different one?

Thanks for the warm welcome.
Yes, I Fitted this motor as front wheel motor to my bike.

 

[Jandekoffieman]

T

You have done nothing wrong the hub motor has an ultimate speed, it is dependant on the what the rpm is wound for. I suspect it is less then 230 -250rpm.
On the hub there should be a code marked in between brackets, it might be marked (13), (14) or another code this will tell us the rpm.

As the hub reaches it's max speed (rpm) for the voltage then the current starts to work against it producing bemf (back eletro magnetic force), the faster the hub goes the more bemf counters the speed/voltage and current starts reducing. The bemf protects the copper windings from melting/over heating.

The ultimate hub speed is dependant on the rpm winding code, for what you want 45km/h a higher wound hub with a code ( 9) or (10) is needed to match the mid drive speed.

Thank you for the learning. Currently i am on Holiday so i cant check it now.
Is it possible to change the ratio of the nylon gears inside the hub, to reduce the rpm of the engine?

And maybe a dumb question but is it possible to change the length/ thickness of the copper wires to play with the rpm or is it smarter to buy a new front hub with the right amount of rpm - windings

Thanks again for your advice!

 

[Nealh]

For your bike and the speed you want you need a faster geared hub so 330rpm for about 45km/m which is ideal for flat terrain some will advocate you use a (D/D) Direct Drive hub but these are very heavy and on the front handling would be even heavier. The smart money is to buy a hub with the rpm/speed you need.

Two motors won't make a bike go faster, it will just become a two wheel drive moped that achieves 45km/h.
If the current Bocsh drive speeds you to 45km/h another motor will just make the Bosch drives work easier to attain the speed. For two motors to work well they need to be equally matched and as such there is not much to gain unless it was for hill climbing or muddy off road riding.


Changing copper windings would be a no unless you are an electrical engineer and understand how they work to give the rpm you require.

 

[Jandekoffieman]

Oke! Thx for your helpfull answer.
My wish is to drive around 55-65 km/u and it seems i am not gonna make it with a 500 w hub, because i cannot find the right hub. Please correct me if i am wrong, but there isn't a 500w hub that can do this, right?
Do you got hints on what will be a goodone for this case? 1000w, 1500w?
i just dont need to much torque only high speed

thx for the help again!

 

[Nealh]

You will need D/D hub with a winding of 400 -500 rpm for that speed about 35/40amps and a very big battery capable of at least double the current.

For more speed you need a faster wound rpm hub or more voltage.

 

[Deleted member 25121]

Why not treat yourself to an IC moped or scooter? They are very economical to run.