Electrical Machines

Question 1

EM (Electric motors)

Answer 1

Electric motors can be defined as an electromechanical energy converter.

Question 2

Generator

Answer 2

An electromechanical device that converts mechanical energy into electrical.

Question 3

Rotor

Answer 3

The rotating part of a machine.

Question 4

Stator

Answer 4

The stationary electrical part of a machine.

Question 5

Armature Winding

Answer 5

The winding on the rotor.

Question 6

Field Winding

Answer 6

The winding on the stator.

Question 7

Brushes

Answer 7

Two pieces of springy metal or carbon that make contact with the commutator.

Question 8

Separately Excited DC Machine

Answer 8

The armature and field winding are physically separate from each other. And the field winding is excited from a separate DC source.

Question 9

Permanent Magnet DC Machine

Answer 9

The armature and field winding are physically separate from each other. The permanent magnets in the stator sets up the stator magnetic field.

Question 10

How to adjust the speed of DC motor (3 ways)

Answer 10

Changing Flux. Changing Resistance. Changing Armature Voltage.