I always assumed that the highest torque from 393 motors came from a 127 power level.
I found two charts on google images that seems to say otherwise, but I can’t really understand them very clearly.
They seem to say that around 100 power, the motors will have the most power, and they’ll barely be running any slower.
Is this correct?
https://vexforum.com/index.php/attachment/56464d7f967fa_motor_speed_comparison.jpg
https://vexforum.com/index.php/attachment/56464d7f91a13_torque_speed_393.jpg
Yes I believe this is true. I believe the reasons for this were discussed in these two threads:
Please use the REV2 version of the graphs, the original thread linked above was based on the earlier specs for the 393 motor.
https://vexforum.com/t/motor-torque-speed-curves-rev2/21868/1
The first graph in post #1 is trying to show that motors control values beyond a certain point have no effect on the motor. This is because some of the parts we use have some headroom built in to make sure the motor will always achieve full speed.
Can someone just tell me what power level range has the most torque?
in order to get the most power out of the motors you would run them at 127 out of 127.
Actually this is not true in practice. They reach a higher torque at some point between 50-60. One of my sister teams had a catapult which wouldn’t pull back at 127, but would pull back at 50. Ultimately running at 127 will burn motors out quicker, so I would suggest running them at 80/127 or below if at all possible for the majority of work. However, if this is for a flywheel with some speed controller then reaching 127 is inevitable with low battery.
We are mixing up a few things here. Sending 100 or more to the motors will always allow them to potentially provide more torque, just think of that number as being proportional to the voltage sent to the motor. The “power” that the motor provides is the torque multiplied by the angular velocity, it’s the red dotted line on the graph above, maximum power is at half of the free speed that the motor would run at for a given control value. However, the graph also shows that the motor will need 2.4A of current to achieve that power (control value > 100), the poor little PTC will soon trip.
The no-load curve above dosen’t pass the sanity test. With no mechanical or electrical governor device on the motor why wouldn’t increased average voltage (100 --> 127 counts) produce an increase in speed? Commutator bounce?
The thread linked in post #2 above by @LEER explains in great detail.
https://vexforum.com/t/cortex-motor-speed-testing/21687/1
thank you sir