Electrical Engineering XYZ MCQs
The flux is maximum in the following part of a dc motor:
- Under trailing pole tip
- Pole core
- Under leading pole tip
- Under the interpole
Correct answer: 3. Under leading pole tip
Explanation: In a DC motor, the flux is maximum under the leading pole tip.
Explanation: The leading pole tip refers to the pole that is ahead in the direction of rotation. As the armature rotates, the leading pole tip moves into a position where the gap between the pole tip and the armature is smallest. This results in the magnetic flux being concentrated in that region, making it the area of maximum flux.
The magnetic flux tends to concentrate under the leading pole tip due to the armature’s rotation and the magnetic field’s interaction. This concentration of flux enhances the motor’s efficiency and performance.
So, to sum up, the flux is maximum under the leading pole tip because that’s where the magnetic field is concentrated due to the proximity of the pole tip to the armature.