On 2/6/2015 10:19 AM, andy pugh wrote: > On 6 February 2015 at 17:11, Viesturs Lācis <[email protected]> wrote: >> I need torque limiter to protect the worm gearbox in case of power >> failure, > > Good thinking, people tend to forget about the stored energy in the > system when making calculations. > > As my dad says (and he saw a _lot_ of broken machinery in his working > life) "There is no physical limit to the power you can extract from a > flywheel"
How about a magnetic clutch that automatically disengages if the power fails? If it must not be allowed to run free, combine the magnetic clutch with a fluid coupling. Ramp up to speed with the fluid coupling then engage the clutch. In a power failure the clutch will let go while the fluid coupling keeps some torque transmission going to prevent one side or the other from slowing down too fast or possibly overspeeding. I was just looking at a PDF for Falk fluid couplings. Looks like they have some that are intended to be the only means of coupling a drive to a load. They'd have to be very robust to handle the heat from the slip that makes them work. Same principle as fluid limited slip couplings used in many full time all wheel drive systems in some cars and trucks. Love that in my 1998 Mountaineer. Any little slip in the back and the front grabs instantly and smoothly. Not useful for extreme off-roading. Stuff the front into a hole while the rear still has traction and it's just like a 2WD, stuck in the hole. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com ------------------------------------------------------------------------------ Dive into the World of Parallel Programming. The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
