Note: Measurement made with Fluke 77 meter. Voltage measured directly across motor output terminals on the controller board. Motor had no load.
Motor appears to have a total dead zone of 6 pwm cnts and center at 133 rather than the expected 127
measured static torque
no weight on wheels…left in_lb (%max) =2.6(44%)…right in_lb (%max) =1.7(28%)
weight on wheels…=3.4(56%)…=2.1(34%)
stall…right in_lb =7.4
stall less static (no weight)…right in_lb =5.7
spec value …in_lb =6.0
Note: Motors were installed on robot. A yard stick was clamped to
wheels and a known weight moved along yard stick until motor moved.
See jpg for setup.
There is about 1 in_lb difference in the left and right motor installations.
Static friction torque ranges from 28% to 56% of spec torque.
Spec motor stall torque is 6 in_lb… measured is 5.7 so very close.
You just randomly selected one of your Motors for this test?? I would guess that you would find variance of Center on both sides of 127. I find that even when my Transmitter is “trimmed” to 127, some Motors are still getting that “little whine” indicating that there is some sort of tendency of movement.
sure, I just want to get some data points up. Take some data and post it here and we can get a good sampling. Im still not sure how they measure the spec torque. Dynamic and static measurements would be quite different.