AC & DC Motors

Question 1

Give two characteristics of an AC motor

Answer 1

AC motors have sped up torque characteristics

Very efficient

Question 2

Positives on AC motors

Answer 2

Cost efficient
Less size
Less maintenance
Better for speed and induct speed faster

Question 3

Two main components of an AC motor

Answer 3

Stator
Rotor

Question 4

What is the stator

Answer 4

The stator is the stationary main block

Question 5

What is the rotor

Answer 5

The rotor is the armature

Question 6

Two ways to coil wire on a AC motor

Answer 6

Star- high voltage
Delta- low voltage

Question 7

What type of magnet is on a DC motor

Answer 7

Permanent induced magnet

Question 8

What characteristic does a DC motor have

Answer 8

Inner windings on the armature

Question 9

What are the hand rules

Answer 9

Right hand rule for magnetic field and current

Left hand rule for force, magnet field and direction of current

Question 10

How does the left hand rule work

Answer 10

Thumb- direction of force
Index finger- flow of magnetic field
Middle finger-flow of current

Question 11

How is torque effected in a DC motor

Answer 11

EMF in windings
EMF in the armature

Question 12

Types of DC motor

Answer 12

Series
Shunt
Compound

Question 13

Positive about the shunt monitor

Answer 13

The shunt can increase and decrease revs in a motor due the the coils

Question 14

What axis are associated with DC motors

Answer 14

Geometric neutral axis
Magnetic neutral axis

Question 15

Parts of a DC motor

Answer 15

Stator
ARMATURE
Main poles
Inter poles
Carbon brushes
Bearings
COMUTALOR
Shaft

Question 16

What does the shunt coil doing

Answer 16

Speed control
(Revs)

Question 17

Why do carbon brushes have to sit on the geometrical axis

Answer 17

Otherwise the carbon brushes would be out of balance and one would be too close and get sparked and damaged, also causes a carbon build up

Question 18

Parts of a AC motor

Answer 18

Rotor
Stator
Main poles
Inter poles
Copper bars