Back when computers where not the norm, the company I worked with made a road load function generator. It worked in conjunction with a motor and a gearbox to couple a eddy current brake. The brake had the road load function generator as its input. The generator really was just a Y=aV^2+bV+c equation, which could easily be implemented in the computer today. (V is speed, a,b & c are the coefficients of windage, resistance, and friction, respectively.) I believe the uphill or downhill component would be mostly the b value.
> Date: Sat, 20 Dec 2008 12:11:43 +0100 > From: [email protected] > To: [email protected] > Subject: [Emc-users] Off topic-Electrical design help > > Sorry guys for using the list for something not really related to EMC, but I > do know here are a lot of people with the knowledge I need. > > It was long time ago I designed something with electronics, so I hope > someone can help me. > What I need is an electric braker-pusher. It will not need to come to an > absolute stop, it should just add or release resistance on a rolling device. > It's very much like the electric braker on a bicycle trainer, but with the > option to give energy too. > > A little spec would be: > A small motor, maybe 12 V and 30 W. Not sure how much needed yet. > Should take a value, for example -100 to +100 from a computer, controlling > the output. Minus values for braking and positive for pushing. > Returns RPM from a magnet switch. > > The motor will always be rotated, even when braking at maximum, some kind of > heat sink is definitely needed. > I would say that the circuit is something like a servo controller board but > a lot more primitive, no positioning or extras, just burning or giving > energy. > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users _________________________________________________________________ It’s the same Hotmail®. If by “same” you mean up to 70% faster. http://windowslive.com/online/hotmail?ocid=TXT_TAGLM_WL_hotmail_acq_broad1_122008 ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
