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I have a problem with a Lishui controller. At least, I think it's the controller. The supplier is currently sending a replacement, so I'll know for sure soon. If the old controller is faulty, I'd be keen fix it and use it on another bike. All is fine except that, if you are out of the saddle...

A while ago I purchased a Yose Power kit with what appears (from the markings on it) to be a rebranded Aikema 95RX 250W rear hub motor. The problem was that the motor would surge once it had reached the speed limit for each power setting, with the rpm rising and falling rhythmically. This was...

Now wondering if I've jumped to the wrong conclusion... If, for example, "power" level 3 gave Tl = 10 mph and level 5 gave TL = 15 mph, then, at 5 mph, PWM pulse width, current and torque would be double in level 5 compared to level 3. So, no need for d to change with power level? Perhaps d is...

Saneagle's equation (below) seems to explain how the controller responds and fits well with the motor characteristics noticed when changing power levels. Current = d(Tl-S) + c Where: d is a simple multiplier S is actual speed Tl is the target speed c is a constant amount (c is small...

By the way, Lishui's product list at www.lsdzs.com identifies "square wave" controllers and "FOC" controllers. I assume FOC is to do with current control, possibly sine wave too, but what's the acronym? Thanks again.

Thanks for all the useful posts. So, modern controllers are much more sophisticated than I thought. With suitable software/algorithms a high degree of control flexibility can be achieved, probably way above my understanding. Whilst modern control methods may be beyond the scope of Sturmey's...

Thanks Sturmey, you know much more than me! I was relying on what I could remember from "A" level physics from over 50 years ago and had stupidly forgotten about inductance. I doubt that's all I got wrong... In terms of how different types of controller work, I'm curious to know what the...

Hi All, Apologies for long post. I have been trying to understand how controllers work, or at least the key principles. I've picked up some useful info from other threads, and especially posts by NealH and vfr400 (=Honda m/cycle?). Thanks to them and everyone else that has contributed. I'd...

Thanks everybody, that's reassuring. I hadn't appreciated that the battery voltage fully charged would be so much more than the nominal 36V. The battery and charger came as part of a conversion kit supplied by a reputable online supplier. Nevertheless I just wanted to check that I wasn't being...

Hello, The supplier says that the 42V charger supplied with my 36V conversion kit is correct, because the fully charged voltage would actually be about 42V. Is this normal, or should I expect a 36V charger? I would be really glad to hear from anyone who understands the electrical side...

I recently fitted a Wooshbikes DWG22C 48Volt hub drive kit to a friend's ICE Trike Adventure 26" (recumbent, tadpole). My friend lives in a very hilly area and, being in his 80s, is not as strong as he once was and limited as to where he could go. He says the conversion changed hill-climbing...

Update: Another problem. If the chain comes off the front chain-ring it can jam between the chain-ring and the three arms of the steel bracket holding the chain guard. Surprisingly, the clearance is less than the width of an 11 speed chain, let alone a 10 speed. It's a pig to fix because the...

My first e-bike... generally good but after 500 miles some issues have come to light. IMHO: The saddle position is too far forward, by as much as 25-30m. The standard suspension seat-post has no set-back and the saddle adjustment is limited. To fix this I have had to buy an after-market...

I bought a Cube Touring Hybrid Pro 625 a few months ago, my first e-bike. I'm an experienced cyclist, into long day rides and touring with the panniers on. This is my first e-bike. Overall it's been good, especially the Bosch motor, controller and software, battery life (if used carefully), the...