Brushless electric motors

Author	Message
larny Guru Joined: 31/10/2011 Location: Australia Posts: 349	Posted: 08:04am 16 Sep 2020         NPHighview said   My son and I built a 2-lb. class battlebot ("Critter Crunch" competitions in the Midwest) using one continuous rotation servo for each of 4 wheels, driven by two SuperRooster PWM-controlled motor drivers powered by two small sealed lead-acid batteries (to provide +&- 12V).  This was extremely powerful, and we went undefeated until he got bored with it. I looked at the link you gave me but I'm confused by the description of the motor. Quote The FS90R continuous rotation servo converts standard RC servo position pulses into continuous rotation speed. The default rest point is 1.5 ms, but this can be adjusted by using a small screwdriver to turn the middle-point adjustment potentiometer. Pulse widths above the rest point result in counterclockwise rotation, with speed increasing as the pulse width increases; pulse widths below the rest point result in clockwise rotation, with speed increasing as the pulse width decrease. -------------- I assume by "continuous rotation" they mean it will run continuously.  Which is presumably why your son was able to use them to drive the wheels.  But they mention a   "default rest point is 1.5 ms, but this can be adjusted by using a small screwdriver to turn the middle-point adjustment potentiometer" What does this mean?  i.e. why would wheels need a rest point? Your assistance is appreciated.