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A bipolar pulse-type hysteresis loop tracer for rare earth based permanent magnets

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8 Author(s)
Rhee, J.R. ; Dept. of Phys., Sookmyung Women''s Univ., Seoul, South Korea ; Kee, Y.H. ; Kim, M.Y. ; Lee, J.M.
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An user-friendly and economical hysteresis loop tracer that permits to measure four-quadrant J-H loop of Nd based high coercivity magnet is constructed. An alternate pulse magnetic field with a peak value of about 10 T is generated by a way of connecting 3 monopolar pulse generators to an air solenoid magnet by using a sequential ignition circuit and a magnet exciting circuit. The J-H loops with initial magnetization curves are then obtained for rod type Nd based magnets (length of 5 mm and diameter of 5 mm) with an electronic fluxmeter. The increase of apparent coercivity of the magnets due to the eddy current effect is calculated, considering eddy current loss by analyzing a wave of generating magnetic field. The results are calibrated with pure Ni rods with the dimension identical to the Nd magnets

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Magnetics, IEEE Transactions on  (Volume:34 ,  Issue: 4 )