BootstrapBob

Thanks for all your suggestions folks. I ran the ideas past the person this was aimed at last weekend and lets just say they were less than enthusiastic about the idea. Ah well, it seamed like a good idea but at least I can now get on with my own pedelec project.

Thanks Matthew, Again good information to know. The minimum speed is I think an important one to consider and may be pushing me back towards the motor-chain drive option suggested by Saneagle.

Thanks Scorpio Electric wheelchair / mobility scooter is a good suggestion. The application is more of a garden trolley to be used by the elderly around a slopping garden on paths. Steering and release braking are already taken care of I was just curious about motive power alternatives by using a pull cord and throttle lever.

A static winch would be the better solution I agree if the trolley was to stay in one location however it may get moved to other locations. I had to google bldc but good to know. I will look at wheelbarrow motors.

Thanks Saneagle, that's all good information. I was thinking about a seperate motor and chain originally and will take another look. I do still like the idea of a hub motor for simplicity. Throttle signals in the 1-4v range makes sense, I had guessed it was some kind of rotary potentiometer and didn't actually limit motor voltage directly, the at would have to be rather a beefy potentiometer.

I knew I would miss something. Tarmac/concrete 16" rim (think Brompton). Private project.

I know this might seam like an odd request and at the moment is quite hypothetical but please bear with me. I require an electric motor and control unit to power a three wheeled trolley up an incline carrying no more than 50kg total weight. My calculations show the motor needs to be no more than 250W and capable of delivering a torque of around 25Nm, dependant on the incline and pull speed. The trolley has 16" wheels with the rear wheel being the powered one and hence my reason for asking on here for recomendations. Because the operator will be at the top of the slope, he/she will control the trolley via a cord which will act like a dog leash attached to a sprung return throttle lever. The operator will pull the cord but will not in theory be taking the full weight of trolley, the motor will be assisting the pull in the same way a pedal assisted cycle would work as you apply pressure to the pedals. Whatever is used does not need a display unit, a PAS could be used and attached to the wheel so that the throttle only works when the trolley starts to move but the key thing is to have the variable speed lever so that the operator has full control of speed. Batteries need to be from a reputable manufacturer and reliable. There are loads of options available out there but I am hoping the experience on here will be able to narrow down a few options for me. Cost is subjective, there is a budget but I would like to see what is available before commiting. I look forward to hearing some suggestions.

Hi Just saying hello. I am interested in e-bike conversions for DIY but I have another project first which isn't a bike but would benefit from and e-bike kit of some kind. Heading over to the conversion kits section to pose my question.