On 8/15/06, Mike <[EMAIL PROTECTED]> wrote:
I have an AC4-4002 6.7 Inch motor from a Tropica that I'm putting in my new bike (see the photo album on the site for construction pix) and it's time to choose gearing. Does anyone know how many RPM these can safely take at 72v?
Hi Mike, I believe that motor is a standard ADC short 6.7 with a little difference in the windings from an A89/A00? The important point is that all the ADC 6.7s should have the same mechanical limits. Bill Dube once told me they can handle over 7500 rpm with no modifications. Getting there will depend on how much you over-volt it, which probably *will* require modifications. (Nothing major, just paint the brush rigging and end bell with clear epoxy.) At 72V the only way you're going to put the motor in danger is by running it with no load. Gearing will come down to what speed it can pull and how fast you want to get there. Personally I'd seriously consider an A89/A00 (wound for 36-48V) and run it higher than 72V. Chris
