speedmd
10 MW
A standard centrifugal clutch with a weaker spring would be a easy way to keep peak torque out and still have some lower rpm torque.
Sorry, hard to judge where folks are starting from at times. Tons of google results on them, so best to get that at where your at with understanding it. These are standard ICE small engine clutches used on most everything. Gokarts, power equipment, chainsaws and the like so they can idle freely. They go right on the motor shaft. The spring is tuned for a desired engagement rpm, so in a electric that does not need to idle, they could be set to a very low RPM just enough to soften the initial torque spike.john61ct said:standard for what?
where does it go?
is it possible to say "limit torque to 150 N.m ?"
Sorry, if you could link to some basic learning resources I'd greatly appreciate it.
john61ct said:> recumpence's davinci drive. He uses a torque limiting clutch on the primary drive
Anybody got a link to that?
Very interested in anything that would tame a crazy-torque standing start
to protect a "fragile" drivetrain.
An actual physical slipping clutch would be very interesting, but I'm a complete noob there.
speedmd said:Rotors on most of the electric motors per KW are near equal in rotational mass to ICE race motors. Overshoot!
A bit of clutch mass will mate well.
Long term, no doubt that throttle only, with brake and reverse (with the help of more advanced controller brain and proper programing of motion control) will far exceed basic mechanical solutions.
I sometimes wonder why there seems to be a bit of a black and white division between mechanical / electronic. It has often seemed to me that electronics oriented people want to solve every problem electronically when there can be a perfectly reasonable mechanical solution
rynhardt said:I've been riding electric trials bikes for the last 3 years now and have become accustomed to riding without a clutch. I believe that it requires different technique but ultimately it comes down to preference. My preference is for low weight.
DanGT86 said:Hopefully Altair can chime in on this one. I'm curious what the foot peg position on a bicycle frame is like compared to standing on pedals. When I stand on a normal set of cranks I have one foot 170mm to the front and 170mm to the rear. This is a very wide platform and provides tons of stability even though the bottom bracket can rotate. A motorcycle is so much heavier that you can move your body around using the inertia of the bike so I would think having both feet trapped in line with each other would be less of an issue.
To those of you out there who have ridden bike frames with stationary pegs instead of pedals, what are your thoughts/observations about it?
DanGT86 said:You could even theoretically cheat and implement traction control if you had precise enough sensors of wheel speed and load.
I have often thought it would be cool to make the throttle output to the controller the sum total of a rising and falling voltage from the throttle and a fake clutch lever (no actual clutch). In this case full throttle with the clutch in would yield no throttle output. Inversely full throttle with the clutch lever released would be max power. In this case it would feel like a normal bike where you still modulate power with the clutch in precise situations like trials. Its easier to squeeze a lever under rough conditions climbing and hopping than it is to precisely angle the throttle while pulling on the bars.
Just a thought.
An actual mechanical clutch might still be more natural for experienced riders with years of muscle memory.
macribs said:DanGT86 said:An actual mechanical clutch might still be more natural for experienced riders with years of muscle memory.
As electric motion launched this year electric trials bike with a clutch and a flywheel with adjustable weights it is hard for me to imagine en fully electric trials bike performing as well without flywheel and clutch. Because Electric Motion has been producing electric trials bike for a while now, not using clutch and flywheel much like Oset does. But this year they changed to flywheel and clutch and it seems those that have ridden the new bike with clutch and a flywheel are raving about them.
rynhardt said:I suspect the major factor in the decision to use a flywheel and mechanical clutch is the broader consumer appeal. Not everyone wants to adapt their riding style for the sake of saving a few kg.
DanGT86 said:Hopefully Altair can chime in on this one. I'm curious what the foot peg position on a bicycle frame is like compared to standing on pedals. When I stand on a normal set of cranks I have one foot 170mm to the front and 170mm to the rear. This is a very wide platform and provides tons of stability even though the bottom bracket can rotate. A motorcycle is so much heavier that you can move your body around using the inertia of the bike so I would think having both feet trapped in line with each other would be less of an issue.
To those of you out there who have ridden bike frames with stationary pegs instead of pedals, what are your thoughts/observations about it?