Which component does NOT play a part in the main driving motor setup?

The power relay does not play a direct role in the main driving motor setup. In a typical motor operation, key components such as the field winding, brake, and armature are essential for the functioning of the motor itself.

The field winding creates the magnetic field necessary for the motor to operate, while the armature is the rotating component that interacts with the magnetic field to generate motion. The brake is crucial for controlling the motor's movement, providing safety and control by stopping the motor when needed.

In contrast, although the power relay is vital in the electrical control circuit to manage power to the motor, it does not contribute to the mechanical operation or driving force of the motor directly. Its role is more about controlling the electrical supply rather than functioning as a part of the driving mechanism itself.