Quote:
Originally Posted by timytamy
Hi all,
We've been experimenting with various motor + veraplanetary combinations for our shooter, and with the higher power 775pro, we noticed a lot of heat (presumably due to friction) being generated. It got to the point where the gearbox was too hot to hold.
We then ran the same combination through our power meter, and saw the 775 was drawing a whopping ~150W (on a ~300W motor) just to overcome the friction. We saw this consistently across two motors, and multiple gear ratios (inc 1:1)
Interestingly, with no gearbox the motor was still pulling on the order of ~30W, more than triple what the maths says it should be.
For comparison, a similar setup with a BAG motor resulted in 30W w/ gearbox no load, and 15W with nothing at all.
We'll do more experimenting tonight, we could well be just putting the versaplanetary together wrong, but what has everyone else's experience been?
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How are you calculating power?
Is the 150W you are referring to the electrical power or mechanical power?
I can tell you the 340ish power that is on the VEXpro web site is at max power and is mechanical power. There is a big difference.
I assume you are referring to electrical power and, if so, you were probably pulling 12 amps from the power source if it was at 12 volts. This is definitely not normal.
We are running 5:1 VP with the 775pro and they are only pulling 2.4 amps, which is about 30ish Watts of electrical power.
I pulled all of these numbers from motors.vex.com/775pro. If you click to expand the motor curve, then all of the data is there.
Paul