Study on rotational hysteresis and core loss under three-dimensional magnetization

In this paper, magnetic properties of soft magnetic composite (SMC) materials under alternating and various rotational magnetizations have been properly measured, modeled, and analyzed at typical frequencies of 5, 50, and 500 Hz. The relationship between the magnetic flux density vector B and magnetic field strength vector H has been systemically studied when the B loci are well controlled to be circles and ellipses in three orthogonal planes of the three-dimensional (3-D) tester. The core loss features against magnetic flux densities with alternating and rotational magnetizations are also compared and analyzed. It is found that the rotational core losses are nearly twice of the alternating core losses at the same magnitude of flux density. Experimental results show that SMC materials have good 3-D features, and great potential for application in rotational magnetic flux machines.