Difference Between AC and DC Motor

Q1

What is slip in a motor?

For an induction motor, slip is defined as the difference between the synchronous speed (N_s) of the rotating field and the rotor speed N. It is expressed as the percentage of synchronous speed Ns.

Q2

How to supply power to the rotor?

Power is delivered to the rotor, or armature, directly from the direct current source in a DC motor, whereas power is given to the device via inducing rotation in an AC motor.

Q3

What are the three types of losses in a DC motor?

There are three types of losses in a DC motor, and they are:

• Mechanical loss: This loss refers to the friction which is caused due to brush and bearings and due to other rotating parts.
• Iron loss: This loss occurs due to eddy current and hysteresis.
• Copper loss: This loss mainly occurs in the armature and in the field windings.

Q4

Why is AC current better than DC?

Very adaptable system. It can use transformers to supply electricity to loads across long distances. AC generators are stronger and easier to manufacture than DC generators. Brushes and commutators are required for DC generators to create DC current.