Explain the applications of cumulative compound motors, define commutation, and show how to calculate the number of conductors for a compensating winding.

Here are the solutions to your questions:

1.1 Three applications of cumulative compound motors are:

• Elevators
• Rolling mills
• Punch presses

1.2 Commutation is the process in a DC machine where the alternating current induced in the armature conductors is converted into direct current at the brushes (for a generator) or vice versa (for a motor) by means of the commutator and brushes.

1.3 To calculate the number of conductors of a compensating winding in each pole face:

Step 1: Calculate the full-load line current ($I_L$).

$$$$