reply to post by roguetechie
Please forgive me for my misunderstanding of your proposed design. When I first looked at your actuators i saw what appears to ge a generator winding
in the belly of your drawing. I went back to review the posts and have a better understanding. The AutoCad drawing will only allow me to move the
slider left / right, and I cannot see much of the design. But now I basically understand what you are trying to accomplish. And yes, we are having
fun yet, although I may have seemed like a KillJoy in my prior misunderstanding of your design mechanics.
This all depends on the diameter of the alloy wires, or the rectangular cross-sectional area of roll-formed alloy. And it would be sweet if you could
fire multiple wires for initial starting torque, as you suggest, and then control the wires to fire in regular intervals after coming up to speed.
Your controls could be set up such that any twist of the throttle would fire more than one at a time in order to increase velocity, and then back off
to regular intervals when the throttle is rolled back somewhat. The control system could be easily driven by a Micro-PLC (Programmable Logic
Controller), of which some are now capable of analog input/output. They are small enough to fit in your hand. Automation Direct makes an inexpensive
PLC's are easy to configure for control systems. If you are a designer of any sort, I recommend you learn about them, and the simple programming
required. I program, or modify machinery programs with them every week around the country, and can assist you if needed. (**You can quickly gain a
6-figure salaried career with PLC skills!)
I do not have enough knowledge of the interior mechanics of this design yet to be able to provide any input.
As we discussed earlier, this will depend on how fast your cycling time is in, and out of TTR. And of course, that depends on how fast you are able
to cool the wires. The dilemma here is that you can cool small diameter wires quickly, but you need larger diameter wires for more power per wire.
The answer then would be more small wires for a total necessary torque. But then you get into the dilemma of many more moving parts due to more
multiples of your Imamarty actuators. Cooling is just as important as heating when devising Nitinol actuators that operate continuously. I am
assuming you are only considering air-cooling, since liquid cooling would further increase the weight, and energy requirements of your power packs.
I do not know the power requirements of current electric bicycle design, so I would not be able to provide input in this regard. And only through
testing would you be able to determine the power requirements of the Nitinol-driven design. I would suggest only building a small working test mockup
to begin with in order to save money. The results could be measured with a small Dynomometer, and design spec's multiplied from that data to
accomdate actual full-size physical requirements, and wire sizes.
Nitinol is always Fun! Even when we fail.... Because those failures are lessons that put you one more step ahead in knowledge towards your next
design. Believe me, if you are interested enough in Nitinol, and you fail in this design, you ARE going to eventually come up with that idea nobody
else has thought of. I only joined this conversation last week because I wanted to give you guys an edge by providing you some fundamental knowledge
of the material charachteristics of this alloy. I dont know how many posts I have yet, but soon should be able to answer your questions directly.
73 (Best Rgards)