Recent content by Steph

I’m considering this kind of drive as a variation of friction drive in the sense that the power is transmitted close to the outer diameter of the wheel so there is no high torque/reduction requirement. It may be slightly less true in your case since you look like using small diameter wheel and...

Excellent, I have wondered for so long why I couldn’t find anyone who explored this way of transmitting power to the wheel. It feels that it allow for lower torque motor, like friction drive, but with a more efficient coupling and indeed regen capability. I’ve been toying with the same concepts...

Ahh, you made my day :) I tried to have a similar discussion and I ended up with the same feeling and being kinda discouraged to pursue, despite having the opportunity of engaging with otherwise smart and experienced people. Once you have a correct clutch mechanism in place, the only price you...

Thanks Addy, Indeed, I didn't account for the losses during the switching phase of the fet. I was rather assuming that with a strong enough drive, the transition is sharp enough to be neglected, but with a tight duty-cycle the switch on and switch off phase may come too close and start to...

What efficiency cost? To me, it’s not like the DC regulation comes on top of the regen and adding it results in extra cost. The motor coil and the half-bridge make a buck-boost (btw, I think buck can also be involved in regen, especially with street legal bikes) circuit that is used for...

Hi Lebowski, I went through the presentation you made for your controller but I haven't played with complex electrical representations for like 20 years and I'm struggling with it. So I tried to come up with a more empirical representation of the situation based on the principles you shared...

Actually I don’t need to be specific (even this part of my trip is not fully relevant, I mostly wanted to present the braking profile in sync with the slope) and that’s a big part of my equation: As mentioned in a previous post, my plan (yes, my bike is not converted yet) is to go for a clutched...

This is the part of my commute for which I’m considering regen. You can see the descent and the speed profile. First slowdown is at a sharp turn before the real descent starts. I usually don’t slow that much but cars really slow down, visibility is bad and ice sheets tend to form in winter...

Hi John, I’m not aiming for the self-engaging friction drive design commonly seen here. The design is smart but indeed not compatible with regen. I’m also not aiming for the always engaged approach some members use for regen because I will mostly use the bike without assist or regen. I saw some...

I do hope so. My daily commute involves about 100m down in the morning and well... a more tiring evening route. My ideal scenario is actually having some supercap (probably not going to happen, it costs..) that would charge in the morning to give me the kick I need in the steepest sections of...

That was indeed the idea, salvaging the frame of motors with already an high pole count: https://h5.aliexpress.com/item/32288259948.html Fully designing a motor is not in my reach.

Hello Everyone, Thank you for your replies. I opened this topic based on a lot of gut feeling, and reading through the contributions, I realised that more than a few proved wrong. I initially though to take part to the discussion, but as it went, I got worried that it would just amount to shame...

Hello, To reduce the need for reduction, I tend to look for low kv motors (as a way to get more torque, less speed) So far, my perception (possibly a collection of misconceptions) is that this can be achieved by two kind of design tweaks: - playing with copper winding (balancing same mass of...

Hello, As mentioned in the early posts of this thread, there is a way to backup the original firmware before tinkering with the device. The method (also described here: https://blog.includesecurity.com/2015/11/NordicSemi-ARM-SoC-Firmware-dumping-technique.html in a way that I found clearer)...

Hello there, I’ve been following discussions here for a while but stayed in my corner. I finally registered and take part... This thread is very interesting because this is exactly what I’m aiming at. My commute is about 8km in the morning, ending with a rather steep 100m descent phase (maxing...