By Charles Reginald Underhill
With the fast improvement of distant electric keep watch over, and kindred electro-mechanical units in which the electromagnet is the foundation of the process, the wish of exact info concerning the layout of electromagnets has lengthy been felt. so as to increasing the data in regards to the motion of solenoids and electromagnets, the writer made a number of assessments masking a protracted interval, through which facts he has deduced legislation, a few of that have been released within the type of articles which seemed within the technical journals. during this quantity the writer has endeavored to explain the evolution of the solenoid and diverse different forms of electromagnets in as completely hooked up a fashion as attainable. In view of the meager info hitherto available it really is believed that this booklet should be welcomed, not just through career in most cases, yet by means of the producer of electric equipment as well.
(Typographical blunders above are as a result of OCR software program and do not ensue within the book.)
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Extra info for Solenoids Electromagnets and Electro-Magnetic Windings
ELECTRIC CIRCUIT sum resistance will be the 21 of the individual resistances. When any number of equal resistances are connected in their joint resistance will be the common multiple, resistance of all the circuits divided by the number of circuits. When two equal or unequal resistances are connected is equal to their product in multiple, their joint resistance divided by their sum, or RR, When any number of equal or unequal resistances are connected in multiple, the joint resistance the reciprocal of their joint conductance.
SOLENOIDS 28 Magnetism cannot be efficiently transmitted over any The practical great distance on account of leakage. method is to transmit a current of electricity through a wire, and then convert its energy into magnetism at the point where the attraction is desired. This accomplished by winding spirals of insulated wire around the magnetic material which is to be magnetized. Such a device is known as an Electromagnet, and upon the passage of an electric current through the is winding, the magnetic material behaves similarly to a permanent magnet of the same general form, with the exception that, if the magnetic material has but little coercive force, the magnetism will practically disappear upon the discontinuation of the electric current through the winding.
Magnet is worked well up to "well below the knee" means very little that the statement that a the knee" or when any degree of accuracy is desired. This arbi- denning saturation is deceptive because trary method " " the knee the position of depends upon the scales to of which the saturation curve is plotted, as will be seen by reference to Fig. 19, all the curves being plotted from the same data except that they are drawn to different scales. SOLENOIDS 32 What is desired is a definition which will indicate 100 per cent saturation for the condition in which is no increase of flux for an increase of magnetizing force, and will indicate zero saturation for the condition in which the flux increases proportionally to the there magnetizing force.