The Lifting Magnet
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
P-368
2025-12-10
7
In order that an electromagnet may have great lifting power, the air gap between the iron core and the iron to be lifted should be as small as possible, the path of the lines of force should be short, and the iron should offer little resistance to the lines of force.
Figure 1 is a cross section of an efficient form, and Fig. 2 shows the magnet in actual use, in transferring steel billets to or from a railroad car. The magnet is placed upon the iron or steel to be lifted, the current is sent through the coil, the magnet and its load are moved by a crane to the desired spot,
and the load is dropped by breaking the circuit. If nonmagnetic substances are to be lifted, they must be attached to an armature.
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