This paper describes the dynamic behavior of permanent magnets encompassed with magnetic fluid subjected to the alternating magnetic fields. The dynamic behavior of NdFeB magnet encompassed with magnetic fluid in the magnetic fields is a fascinating subject that is attracting the attention of robot researchers and micromachine engineers. This subject is concerned with the development of the micro actuators driven by the wireless energy supply system. A permanent magnet adsorbs magnetic fluid, and it is suspended in magnetic fluid. The permanent magnet in the self-levitation phenomenon can be easily controlled by the external magnetic fields. Some basic responses of permanent magnets encompassed with magnetic fluid subjected to the alternating magnetic fields are studied with a high speed video camera system. Experimental results show the possibility of the control of the permanent magnet motions by the external magnetic field. According to the frequency of external alternating magnetic field, the responses of permanent magnet show reciprocating, rotary and metronomic motions. The effects of the magnetic fluid volume and magnetic field intensity on the dynamic behavior of permanent magnet are revealed experimentally.
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