- AC motors have a constant (and relitively fast) speed and are popular in heavy industrial applications
- DC motors are widely used in robotics but aren’t very efficient - the speed of a DC motor is proportional to the voltage, unlike AC. popular in robotics
- Stepper motor can control the RPM of the motor. Thye cost more and are bigger than their DC counterparts.
- Brushless DC motors are exactly what they sound like. in DC motors the friction from the internal brush is a limiting factor in longevity and efficiency, but in brushless motors the limiting factor becomes heat. These are much more efficient, but they are hard to sense and control.
- Servos are super useful as actuators for steering, but arent main driving motors themselves.