So far we have experience with two motors: the OSEPP 25mm motor that comes with the OSEPP Tank Kit, and the micro gear motors (made by Pololu?). The latter are available in a variety of gear ratios. Both have a Hall Effect motor encoder kit available.
This is the motor that comes with the OSEPP Tank Kit. You can buy motor kits that come with an anodised aluminium wheel, a silicon tire. A Hall Effect motor encoder kit is available separately.
- Voltage: 9v DC
- Length: 52mm
- Diameter: 25mm
- Rated Torque (Kgf.cm): 1.5
- RPM: 8500
MiniQ Motor Wheel Set#
RobotShop sell a MiniQ Motor Wheel Set w/ Encoder that includes two micro gear motors, wheels, white plastic hubs, and a motor encoder pair — with the encoders integrated into the motor mount — for US$36. They use a 50:1 gear ratio rather than 298:1 (perhaps that's better?). This uses an optical encoder rather than a Hall Effect encoder, using the white teeth of the inner wheel hub for the optical interrupter, 48 pulses per revolution.