The EV3 kit comes with two large motors and one medium motor. Beyond the packaging, there are some other important differences between the large motor and the medium motor. The following list compares the features of the large and medium motor:
Large motor maximum speed 170 rpm
Medium motor maximum speed 250 rpm
Large motor torque when rotating 0.21 N∙m (Newton-meters is a unit used to measure torque)
Medium motor torque when rotating 0.08 N∙m
Large motor torque at standstill 0.42 N∙m
Medium motor torque at standstill 0.12 N∙m
Large motor mass is 76 grams
Medium motor mass is 36 grams
The large motor will be excellent to power the drive train of our robot, and if you need the extra speed, you can always gear the motors up. If you need more torque, you can gear down. The medium motor is about half the mass of the large motor. The medium motor actually spins about 50 percent faster than the large motor. The torque of the medium motor is only a fraction of the large motor. This makes the medium...