engineering recuitment NCRTC Junior Maintainer Mock Test Series 2025 Electrician and Wireman Electrical Machines DC Motors
What is the main principle behind the operation of a brushless DC motor?
1
Use of slip rings and carbon brushes for commutation
2
Application of magnetic induction in the stator windings to produce rotation
3
Varying the frequency of the power supply to control motor speed
4
Feedback from a Hall sensor or encoder for accurate electronic commutation