Small motors, transformers, electromagnets; a practical presentation of design and construction data for small motors, small low- and high-tension transformers, electromagnets, and induction coils (1920)
Stoller, Hugh Montgomery, Austin, F. E. (Frank Eugene), 1873-, Seeger, Edwin Wilbur, 1892- joint author, American Technical Society · Chicago, American Technical Society · leaf 293
y^^2m0l (28) It should be remembered in using equation (28) for the horse-shoe magnet that the area A is the sumof the areas of the two poles and I isthe sum of the air gaps, or twice thedistance between the armature and thecores. Equation (28) is only approx-imate because there is always a great… … Fig, 21. Horseshoe TypeElectromagnet Example 25. Assume that the cores of the magnet shown in Fig. 21each have an area of \ square inch. The air gap is \ inch, and the pull requiredis I pound. How many ampere turns will be required, assuming that 25 percent additional ampere turns are required to…
Electric motors · Electric transformers · Electromagnets · Induction coils
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