I am working on a small robot (must fit within a cubic foot). The pertinent requirements are that we’re looking for a velocity of 2 ft/sec (60.96 cm/sec), with acceleration of 1 ft/sec (30.48 cm/sec).
I also need to have an encoder on the wheels, so I know for certain that the wheels are all turning the same speed like they’re supposed to.
I also have the requirement that the whole of the wheel and motor have to fit inside a 2 inch radius circle.
The power supply will be about 6V, maybe 7 if needed.
Low cost is preferred…
The current combo that I’m looking at is this one:
Motor:
Solarbotics RM2 (high-power motor for GM2/3/8/9)
pololu.com/catalog/product/611
or
Solarbotics RM3 (Replacement Motor for GM2/3/8/9, Regular Motor 3)
pololu.com/catalog/product/604
put into this:
Solarbotics GM9 143:1 Gear Motor 90deg. Output
pololu.com/catalog/product/188
Encoder:
Wheel Watcher Rotation Encoder for GM2/3/8/9
solarbotics.com/products/gmwwk1/
solarbotics.com/products/gmww02/
Wheels:
GM Series Plastic Wheels
pololu.com/catalog/product/184
The chart on the RM2 comparing it with the GM2/3’s motor implies that it won’t be fast enough at 5V, and I don’t think I can get the power up to 9V. Even then I don’t think it’ll be fast enough. There also aren’t torque measurements.
However, I cannot find specifications for the RM3. The page says nothing about its speed or torque.
I need an rpm of about 165 or more with those wheels to get 2 ft/sec.
As long as torque is over 15 oz-ins it should be fine.
Does anyone know the specs of the RM3?
Is it the same motor as is in the GM8/9?