Brand new motor issues

Programming Support VEXcode IQ Technical Support
1

We got 6 new motors for our robot to go to Worlds with and when we placed them on our flywheel we noticed it was going slower with the new motors than with the old motors. We are using a Gen 2 brain. When we checked the velocity of the new motors they never reached 100 where the old motors would reach 100.
We wanted to check the RPM’s of the motors but with a Gen 2 brain, you can’t easily see the RPMs when you exit the velocity screen the RPM’s disappear. I’ve attached the videos of the flywheel running with the new motors and the old motors as well as the screen showing the velocity and current of the new and old motors. ANY help would be appreciated. Also I don’t know if it matters but the logo on the old and new motors are different colors. The new ones the VEX logo is solid white and the old ones are solid blue. Also, we thought we remembered when connecting new motors for the first time the brain prompted use to press the check mark to calibrate the motors or something the first time they were added. When I asked support they had never heard of this but we swear we member our other motors doing this.

Old motor velocity

Old motors on flywheel

New motors velocity

New motors on flywheel

2

That was a firmware update. You would probably have done that on the old motors at some point. We released a motor firmware update with the last vexos release.

Branding changes over time.

I don’t see a significant different in the velocity readings, motors will always have some variation.

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3

Is there a way to see the RPMs of the motors? It was easily to see on the gen 1 brain but once you exit the velocity screen to see the rpm it goes away. We only see it for a split second

4

Try to print the RPM of the motors on the brain:

while True: Brain.print(motor.velocity(RPM))

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