Electrical Machines
Notes
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See all →- What is the working principle of a DC motor and how does Fleming's left-hand rule apply? In one line A DC motor works because a current-carrying conductor placed in a magnetic field experiences a force F = BIl , and the commutato... 1
- What is back EMF in a DC motor and why is it important for the motor's operation? In one line Back EMF is the voltage generated in the rotating armature of a DC motor that opposes the supply voltage; it automatically contr... 1
- What are the main parts of a DC motor and what is the function of each part? In one line A DC motor consists of a stationary field system (yoke, poles, field winding) and a rotating armature (armature core, winding, c... 1
- How does a three-phase supply create a rotating magnetic field in an induction motor stator? In one line When a balanced three-phase current flows in three stator windings placed 120° apart in space, the combined flux has constant ma... 1
- What are the types of DC motors and where are shunt, series and compound motors used? In one line DC motors are classified by how the field winding is connected to the armature: separately excited and self-excited (shunt, seri... 1
- How does a three-phase induction motor work, and what is slip? In one line The rotating stator field cuts the rotor conductors, induces currents in them, and the resulting force drags the rotor along in... 1