Yokler convert to dual hub motor

[Keithevert]

We have Yokler cargo bikes that we are thinking of converting to a dual hub setup.
Yokler make E-trikes with mid mounted bafang 250w motors.
We want to understand how to convert to two 125w motors, one in each rear wheel to give an increase in torque.
The bikes can carry people or cargo and current setup struggles to get up hills, but is ok on the flat.
Looking at Heinzmann setup, but are there any alternatives

 

[amberwolf]

If you can show us specifics of the rear wheel design and mounting, and how the pedal power is routed to them, it will help us help you find a solution that will fit.

Depending on it's physical design, it's possible that no typical motor will fit and a custom solution would have to be used, or a non-wheel-mounted motor driving the wheels by belt or chain or friction drive, but you'll have to show us it's details in good clear well-lit pictures, preferably in direct sunlight, to find out.

I don't know of any 125w hubmotors to go in the wheels, but you can use whatever motor will fit in the mounting (if any will), and then pick a small controller like a 24v 10A (or less A) for each one and then modify it to limit it's speed. (such as by modifying it's current monitoring shunt for higher resistance)

Some larger controllers like the KT (kunteng) and LS (LiShui) are available in 36v 10-20A+ sizes that have options in their menus to limit current or power without physically modifying them.

Similarly, various middrive options may already have built-in controllers with limiting options.

Note that depending on your hills, you may require much more than the 250w stated, so providing details on the terrain and wind conditions you have, along with the total weight of trike and rider(s) and anything being carried, and the speed at which you need to climb, will help us help you find out how much power it will take, using simulators like those at ebikes.ca.

 

[Keithevert]

Everything you need to know is here.

https://www.heinzmann-electric-motors.com/en/downloads/cargo-power-system?task=download.send&id=78:rn-111-cargopower-e-bike-motor-e&catid=21

 

[Keithevert]

And this is the system

https://www.heinzmann-electric-motors.com/en/downloads/cargo-power-system?task=download.send&id=93:cargopower-drive-system-for-heavy-duty-applications&catid=21

 

[rafalg]

Maybe go for simple and entirely separate setup with a motor in the front wheel?
Then for normal riding you'd rely on the original mid motor, and use the front wheel one only in case you need a jolt of extra power.
For example when starting from stand still or when going uphill.
The front motor could be activated by a separate throttle/some 'turbo' button, and could even run from its own small battery (in case the original one is not sufficient for the extra load)

 

[amberwolf]

Everything you need to know is here.

https://www.heinzmann-electric-motors.com/en/downloads/cargo-power-system?task=download.send&id=78:rn-111-cargopower-e-bike-motor-e&catid=21

And this is the system

https://www.heinzmann-electric-motors.com/en/downloads/cargo-power-system?task=download.send&id=93:cargopower-drive-system-for-heavy-duty-applications&catid=21

While that is interesting information about the motor, it tells us nothing about your specific trike, which is what must be known to find a system that will work on it. (unless you are intending to modify the trike to fit the motor, in which case *any* motor system that fits your power / torque needs will do what you want)

If you already know *for certain* that this specific motor will work on the trike, and have actually seen it correctly installed on an identical trike, then this system will work on yours and it's specifications apply to your trike.

Otherwise, we still need to know the details of your trike's wheel mounting system and frame, etc.

We also need to know the other info about your usage and weights and whatnot to find out the power required to do what you want.


It's ok if you don't want to provide this info, but our help will be limited to guesses.