Title :
A pulse-type hysteresis loop tracer for rare earth based permanent magnets
Author :
Rhee, J.R. ; Lee, Y.H. ; Kim, M.Y. ; Song, E.Y. ; Oh, M.Y. ; Kim, K.M. ; Lee, I.S. ; Hwang, D.G. ; Lee, S.S. ; Park, C.M. ; Lee, K.A.
Author_Institution :
Dept. of Phys., Sookmyung Women´´s Univ., Seoul, South Korea
fDate :
9/1/1997 12:00:00 AM
Abstract :
A hysteresis loop tracer which is able to measure minor and major loops of Nd based high coercivity magnets with a single experiment is described. Oscillatory magnetic field 113.4 kOe of maximum amplitude, 71 Hz, 0.74 of amplitude damping ratio for measuring the M-H loop is generated by discharging a 5 mF capacitor charged with 600 V into the air solenoid (number of coil turns of 300, inner diameter of 14 mm, outer diameter of 36 mm, length of 32 mm) immersed into liquid nitrogen. The minor and major M-H loops of a Nd based magnet (6 mm dia. and 5 mm long) under the field is obtained with an electronic fluxmeter. The measurement is calibrated with a Ni rod with the same dimensions of the Nd magnet
Keywords :
magnetic hysteresis; magnetic variables measurement; neodymium alloys; permanent magnets; air solenoid; calibration; capacitor discharge; electronic fluxmeter; high coercivity alloy; oscillatory magnetic field; pulse-type hysteresis loop tracer; rare earth based permanent magnet; Capacitors; Coercive force; Current measurement; Damping; Length measurement; Magnetic field measurement; Magnetic hysteresis; Magnets; Neodymium; Solenoids;
Journal_Title :
Magnetics, IEEE Transactions on
