The Toecutter
100 kW
- Joined
- Feb 8, 2015
- Messages
- 1,317
I have been building an electric-assist velomobile for the last several months and it is getting close to time to order the components for my drive system. It's a tadpole trike and is rear wheel drive.
However, I haven't come across a drive system that meets my needs during my searches. I was wondering if anyone here knew of a system that would meet my requirements.
My requirements are as follows:
-at least 3 kW peak power
-pedelec system that senses torque output of rider's pedaling and applies electric power proportionally
-less than 10 lbs motor weight
-motor must be able to be decoupled from powering the trike
-greater than 85% motor efficiency during low power outputs of < 500W when operating at cruising speed(~30 mph)
The topic for my project is here:
https://endless-sphere.com/forums/viewtopic.php?f=3&t=66772
Out of everything I searched, I really like the Astroflight 3220 motor used in recumpence's build, but it has no built-in torque sensor, and I am not certain as to how I could get this motor to work with a pedelec setup because of that(I don't want to use a cadence sensor as they don't operate to my liking; I want is to base the level of assist on my torque or power output).
My power requirement means that I will have to have the motor providing power to the rear wheel in a separate system from the chain that is driven by the pedal crank. Recumpence's system can do this, but his uses a thumb-switch, instead of being a pedelec. A split-broach spline could perhaps be used for this?
There are a few hub motors by Crystalyte and others that come close to my requirements, but I would prefer a mid drive so that I don't have to deal with motor losses when under pedal-only mode. The BionX systems are nice, but are too lower power for my liking and their battery is integrated, limiting my build options too much.
My project is primarily going to be a human-powered vehicle and I'd like to be able to keep going even if the battery is drained. I just want some ass-hauling capabilities on the side for picking on cars at stop lights... and when needed, a low amount of assist for a long duration so that maintaining 30 mph all day long isn't much more physically stressful than walking.
However, I haven't come across a drive system that meets my needs during my searches. I was wondering if anyone here knew of a system that would meet my requirements.
My requirements are as follows:
-at least 3 kW peak power
-pedelec system that senses torque output of rider's pedaling and applies electric power proportionally
-less than 10 lbs motor weight
-motor must be able to be decoupled from powering the trike
-greater than 85% motor efficiency during low power outputs of < 500W when operating at cruising speed(~30 mph)
The topic for my project is here:
https://endless-sphere.com/forums/viewtopic.php?f=3&t=66772
Out of everything I searched, I really like the Astroflight 3220 motor used in recumpence's build, but it has no built-in torque sensor, and I am not certain as to how I could get this motor to work with a pedelec setup because of that(I don't want to use a cadence sensor as they don't operate to my liking; I want is to base the level of assist on my torque or power output).
My power requirement means that I will have to have the motor providing power to the rear wheel in a separate system from the chain that is driven by the pedal crank. Recumpence's system can do this, but his uses a thumb-switch, instead of being a pedelec. A split-broach spline could perhaps be used for this?
There are a few hub motors by Crystalyte and others that come close to my requirements, but I would prefer a mid drive so that I don't have to deal with motor losses when under pedal-only mode. The BionX systems are nice, but are too lower power for my liking and their battery is integrated, limiting my build options too much.
My project is primarily going to be a human-powered vehicle and I'd like to be able to keep going even if the battery is drained. I just want some ass-hauling capabilities on the side for picking on cars at stop lights... and when needed, a low amount of assist for a long duration so that maintaining 30 mph all day long isn't much more physically stressful than walking.