View Single Post
  #2   Spotlight this post!  
Unread 08-03-2013, 19:58
Ether's Avatar
Ether Ether is offline
systems engineer (retired)
no team
 
Join Date: Nov 2009
Rookie Year: 1969
Location: US
Posts: 8,071
Ether has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond repute
Re: CIM ? feeling foggy

Quote:
Originally Posted by DMike View Post
We have looked at the curve, but what would the optimal RPM be for a CIM ? The application is the shooter and the concern is recovering wheel speed.
If your concern is recovering wheel speed, you want your CIM to be spinning at roughly half the free speed at your setpoint. That way, when the speed drops due to a frisbee passing through, you are near the max power point on the operating curve. Also, the more command headroom you have at your setpoint, the faster the recovery.

For a more thorough answer, please answer these questions:

- what motor controller(s) are you using for the shooter?
- what motors(s)
- what is the total gear ratio from motor(s) to wheel(s)
- wheel(s) diameter
- what is your setpoint operating speed(s)
- what is the current draw or voltage at those operating speed(s)
- what speed sensor are you using?
- how are you decoding the speed sensor signal?
- what's your speed control method (PID, bang-bang, TBH, etc)



Last edited by Ether : 08-03-2013 at 20:03.
Reply With Quote