Good-day, I was observing the PWM signal coming out of the Motor controller-29 using an oscilloscope. I realised that above a PWM value of 90, the signal went completely crazy.There was a lot of noise on the signal and I was not even able to observe the PWM period. I was able to observe the PWM si…

Also, I am not exactly seeing what that motor controller is doing when used with the 2-wire motors. The three wire motor ports on the Cortex has a PWM signal pin and then I plug in the motor controller into that and then send to the motor. So, what exactly is that doing? Thanks.

Have you read the multitude of recent threads discussing motors? https://vexforum.com/t/motor-torque-speed-curves/21602/1 https://vexforum.com/t/vexpro-motor-speed-tests/21688/1 https://vexforum.com/t/cortex-motor-speed-testing/21687/1 The motor controller turns the RC servo pwm signal into a va…

PWM doesn’t come out of the motor controller 29 it goes in… :stuck_out_tongue: Interesting that 90 is special though. How/where are you taking the measurements?

‹G1›: PWM doesn’t come out of the motor controller 29 it goes in… :stuck_out_tongue: Interesting that 90 is special though. How/where are you taking the measurements? Unfortunately “PWM” has different meanings for the input and output signals of the MC29. On the input side the pulse will ch…

Interesting. The PWM outputs from Cortex motor ports 2 thru 9 are just control signals. This PWM just tells the downstream electronics (either in the 3-wire motor or in the MC29) which direction to turn the motor and how much power (basicly what average voltage) to apply to the motor. Cortex motor …

[image] TomW: So, is your MC29 not providing full power? Maybe and maybe not. Ninety percent of full power may just be a limitation of the circuitry in every MC29. An interesting experiment would be to compare the MC29 output characteristic to that of motor ports 1 and 10. The output delivering …

vex motor controller

VEX V5 Technical Support UNOFFICIAL Tech Support

jgraber July 5, 2012, 1:33pm 5

PWM seems like a good description of mc#29 output.
How else would you describe picture 3 of post 1 of this thread?