DC Motor

This model represents a permanent magnet DC motor with a rack-and-pinion mechanical
drive. Terminals A and B are the electrical nodes as shown in the above figure. Node C is
a linear motion node representing the tip of the moving rack. The rack-and-pinion drive
dimensions are such that when the rotor turns by on radian the rack moves by one meter.
The rack moves in the positive direction when the voltage at node A with respect to node
B positive.