RPMs and Hub Motors

Please describe the environment within which this equipment is operating. Is this a 50cc moped, for example?

I'm guessing that you are describing a hub motor assist system for a bicycle, but I'm not sure. There are numerous ways to implement such a system, with a thumb "throttle" (speed potentiometer) being among the simplest. Ordinarily, you'd expect to find a torque sensing system used, so that as you pedal harder (not faster) the assist motor comes into play. If you use the Google search phrase: torque sensing for pedal assist motor you will get many references to systems patented and used.

What are you talking about??

You must post a detailed question if you expect to get any intelligent answer.

Try again.

Regards.

Links below may be of any help:

http://cr4.globalspec.com/thread/13928

http://cr4.globalspec.com/thread/7604/Hub-Motor-for-Electric-Vehicles-Rotor-on-the-outside?frmtrk=CR4digest