Electrical Power Systems Technology

Mechanical Systems 361

torque and speed characteristics of DC motors.

A DC motor is designed so that its shaft will rotate in either direc-

tion. It is a very simple process to reverse the direction of rotation of any

DC motor. By reversing the relationship between the connections of the

armature winding and field windings, reversal of rotation is achieved.

Usually, this is done by changing the terminal connections at the point

Figure 14-6. Shunt-wound DC motor

Figure 14-7. Compound-wound DC motor