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 314
circuit dies down and an e.m.f. is again induced in the winding.The value of the induced e.m.f. at the break depends upon thespeed with which the circuit is broken, because any inducedvoltage depends upon the rate at which the lines of force are cut.When the flux is reduced to zero in 0.01 second,… … lNT£X/iSU/ro/Z OP£/z/^T£a Fig. 40. 77A7i£ Building Up of Current in Primary Coil equal to 4 to 10 times the battery voltage is usually obtained.As a result of this high induced e.m.f., a bright hot spark is pro- 301 62 ELECTROMAGNETS AND COILS duced at the point of rupture. This spark is used to…
Electric motors · Electric transformers · Electromagnets · Induction coils
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