Quote:
Originally Posted by Ether
When you say "2011 FP motor", what does that mean?
I looked at the 2011 KoP, and there's a FP 00801-0673 listed, and a FP gearbox with a 9015 motor. These motors are very different. Which one are you using?
How did you measure the RPMs?
What were you expecting?
|
Sorry, we are using the 00801-0673 on the AM 3.67:1 planetary gearbox. The motor curve data shows a free speed of over 20,000 RPMs. Starting with the 3.67:1 ratio on the motor and 1:1 final chain drive, the theoretical no load/free speed RPMs are over 5000 RPMs. Certainly there is the mass of the wheel, axle, chain, drag, etc. In the end all this loads it down by more than 50%, for a final max speed of 2200 to 2300 RPMs.
To detect wheel speed we are using a custom Hall Effect Latch encoder we built based on the US1881, and verified the data via a Logic analyzer (clean and consistent square wave), frequency counter on a multimeter, and via counters in Java on a digital input. So I am confident with the actual axle speed we are getting.
Under load with all the variables I am not complaining about the 2200 RPMs, it was just a data point for the original poster on our FP 00801-0673 plus AM 3.67:1 geared shooter.
