Stepper Motor
From CNC.xyz Wiki
A Stepper Motor is one of the most common motors used to control mechanical machines such as printers, scanners and CNC Machines.
See also Servo Motor.
Bipolar Stepper Motor
Bipolar motors typically come in a 4 wire configuration only, though a 5, 6 or 8 wire motor can also be wired as a Bipolar motor by leaving the inner coil lines unconnected.
Unipolar Stepper Motor
Unipolar motors typically come in 5, 6 or 8 wire configurations, in all cases the inner wires of the coil are all wired to a common point.
A Unipolar Motor can be wired as a Bipolar Motor by leaving the Common lines unconnected.