Electrical Engineering XYZ MCQs
A triangular MMF wave is produced in the air gap of an electric machine. Such wave is produced by:
- Rotor of a DC machine
- Stator of a DC machine
- Rotor of an synchronous machine
- Stator of a induction machine
Correct answer: 1. Rotor of a dc machine
Explanation: The rotor’s windings are responsible for the interaction with the static magnetic field provided by the stator. As the rotor rotates, the commutation process (involving the segmented commutator and brushes) continually alters the magnetic interaction within the machine. The nature of these interactions can give rise to various MMF waveform shapes, including potentially a triangular waveform, depending on the specific geometry and switching characteristics.