Quote:
Originally Posted by DampRobot
The final ratio is about 1.8:1 (reduction).
We are using the 0673 Fisher Price motors
speed spinning freely of about 4800 rpm
The motor is drawing about 37 amps accelerating and 27 steady state.
|
How did you measure the amps?
What is the diameter of your shooting wheel(s)?
What is the design of your shooter:
- top and bottom powered wheel(s)?
- top and bottom wheel(s), only bottom powered?
- bottom wheel(s) (powered) and chute on top?
- something else?
The free speed and current you quoted above (4800rpm & 27amps) - was that at 100% PWM?
EDIT:
4800rpm * 1.8 = 8640 rpm motor speed
from the motor curves, an 0673 drawing 27 amps at 8640 rpm is getting only about 8 volts.
So, you are gearing your speed up and then dropping the voltage down.
I suggest that you get rid of that second-stage gear-up and run this thing with a net gear-down ratio of 4:1 instead of 1.8:1