Title :
A magnetic amplifier frequency control
Author :
Johnson, L. J. ; Schafer, H. G.
Author_Institution :
Naval Research Laboratory, Washington, D. C.
fDate :
5/1/1950 12:00:00 AM
Abstract :
TO SUPPLY power to certain types of shipboard instruments, a source of alternating current is required in which the frequency error must be ±0.1 per cent or less over a range of temperatures, loads, and supply voltages. This need has been met by the use of small motor-driven alternators which run on the ship´s d-c power supply. Frequency regulation is accomplished by shunt-field current control in the motor, and the field current is controlled by some form of servomechanism and frequency-sensing device.
Keywords :
Frequency control; Magnetic circuits; Magnetic cores; Magnetic resonance; Magnetic separation; Magnetomechanical effects; Toroidal magnetic fields;
Journal_Title :
Electrical Engineering
DOI :
10.1109/EE.1950.6433858
