About Motors

  • Plain DC Motors
    • Plain DC Motors can be very cheap.
    • They are easy to find.
    • They can be tiny (thinner than a pencil and 1/2" long)or very large.
    • They generally can be run in either direction simply by changing the leads.
    • Being DC the small ones can be run on batteries.
  • Gear Motors
    • Small gear motors usually are plain dc motors attached to gears.
    • Usually the gears output a slower speed with higher torque.
    • Some can be very cheap.
    • Usually they can be reversed by changing the leads.
    • Being DC the small ones can be run on batteries.
  • Stepper Motors
    • Stepper motors move a certain number of degrees each time a voltage is applied. Then the stop. In general it is more complicated than this. They need power applied in different ways to different windings. They are used where you need accurate movement such as with the steppers in our router tables and 3D printers.
    • Usually the have 5,6,7,or 8 wires.
    • They are more expensive than plain dc motors.
    • They can often be salvaged from dead paper printers.
  • Hobby Servo Motors
    • These are the motors used to control stearing on Remote Ccontrol (RC) Cars, or the flaps on RC airplanes.
    • The work by sending them a signal using Pulse Width Modulation (PWM). Given a certain signal the shaft turns to a particular place or angle and then stays there.
    • They are more expensive than plain dc motors. Generally you get what you pay for.
  • H - Bridges
    • An H Bridge is a circuit that is designed to run a motor. In a plain DC motor they can be used to control a motor so that it can run in either direction.
    • A dual H Bridge can be used with an Arduino to drive a stepper motor.