Consider the device like a primitive relay. The armature on the right would be g
ID: 1808499 • Letter: C
Question
Consider the device like a primitive relay. The armature on the right would be guided and aligned with the core on the left. A return spring would be used to pull the armature back to the right once the coil is de-energized. The springs effect is addressed below. As a relay some contacts are connected to, and move with, the armature. Other contacts are stationary and would make or break contacts as the armature moves. The following characteristic re given: Core and armature material = cast steel, us Fig 1-5(b), pg. 3. N = 500 turns Mean core path through the core and armature = 360mm Each air gap between core and armature = 1.5mm With the given airgap, a flux density B = 0.8T is required to move the armature and actuate the relay. This is required to overcome the spring. Determine: (a) Find the current in the coil. Hint: the air gap is so small, fringing is negligible. (b) What is the permeability of the relayExplanation / Answer
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