Calculate the current required to lift the load for the electromagnet of Example 18.9. Calculate the holding current required to keep the load in place once it has been lifted and is attached to the magnet.
Assume:
N = 700;
?0 = 4? × 10?7;
?r = 104 (equal for electromagnet and load);
initial distance (air gap) = 0.5 m;
magnetic path length of electromagnet = l1 = 0.80 m;
magnetic path length of movable load = l2 = 0.40 m;
gap cross-sectional area = 5 × 10?4 m2;
m = mass of load = 10 kg;
g = 9.8 m/s2.
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.
Analysis:
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