Rotor windings in wound rotor motors are connected to? on the shaft of the motor. Brushes allow those windings to be connected to external resistors to control the speed of the motor.

Slip Rings

Explanation:

The wound rotor motor has a three-phase winding with each one connected to seperate slip rings. These slip rings contain brushes which form a secondary circuit where resistance can be inserted and this will allow for the rotor current to run more in phase with the stator current which will result in increased torque that is created