Originally Posted by Bry195

well then we are birds of a feather. While in school I worked at Honda on the machine design team. i went to work for Mori Seiki (Fanuc and Mitsubishi guy), then indramat that turned into Mannesman Bosch Rexroth. I started as the the guys who designed the control systems (starting with servos and spindles) for whatever new job we had. Indramat developed the first digital ac servos (not me) and i was responsible for all the inertia mismatch in the great lakes region. At that time most of the competition sized based on horsepower. you very well could have gotten a design from me starting around 94. If you were using our stuff and had a bad sizing from a distributor or elsewhere...oops. I got lucky. Indramat guarenteed designs and I had good teachers. Indramat basically owned the auto industry back then.

if you are trying to find ways to apply what you know we are like minded. at some point I would like to model a chassis in a motor selection software (some still prefer to do it by hand) and use the rules of thumb for inertia on a BLDC motor. based on the way we accelerate and decelerate I would match the motor rotor to the chassis below 30;1. but based on just looking at the way we accelerate and decelerate I think its a little too high. position10>1, reciprocate 30>1, and line shafting at 60>1. I wont hog all the glory if you want to crack that nut.

I dont think that a dead weight on the motor shaft would be illegal.