For the electromagnet of Example 18.9:
a. Calculate the current required to keep the bar in place. (Hint: The air gap becomes zero, and the iron reluctance cannot be neglected.) Assume ?r = 1,000, L = 1 m.
b. If the bar is initially 0.1 m away from the electromagnet, what initial current would be required to lift the magnet?
Example 18.9
An electromagnet is used to collect and support a solid piece of steel, as shown in Figure 18.38. Calculate the starting current required to lift the load and the holding current required to keep the load in place once it has been lifted and is attached to the magnet. Assume that the cross-sectional areas of the electromagnet, load (bar), and air gap are equal.
Assumptions:
a) Air gap becomes zero and the iron reluctance cannot be neglected
b) Neglect the iron reluctance
Analysis:
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