Magnetic Materials Characteristics

Question 1

What is a Magnetism curve?

Answer 1

A graph showing the relationship bewteeen magnetisng force (H) and flux density (B) in a material.

Question 2

What does the magnetism curve look like for non-magnetic materials?

Answer 2

A linear line that travels at 45^o

Question 3

What shape does the B-H curve look like with magnetic materials?

Answer 3

S-shaped

Question 4

What are the four regions of a B-H curve for magnetic materials?

Answer 4

Orign: H = 0, B = 0

Heel: as H increases B increases slightly

Knee: as H increases B increases significantly

Saturation: as H increases B increases slightly

Question 5

Where do machines utilising magnetic circuits usually operate in the B-H curve?

Answer 5

Between ‘Heel’ and ‘Knee’ of the curve

Question 6

Out of these four materials (Silicon steel, cast steel, cast iron and air) list them from best to worst in terms of conducting magnetic flux

Answer 6

Silicon steel

cast steel

cast iron

air