In order to realize miniaturization and low power consumption of the LF (low frequency) radio transmitter, a novel LF radio transmitting technology called as RMBMA (rotating-magnet based mechanical antenna), which is based on mechanical rotating of permanent magnet to induce electromagnetic fields, was researched theoretically and practiced in engineering. A technology scheme of RMBMA based on NdFeB magnet and permanent magnet synchronous motor, and an information loading method were presented. With electric-mechanic-electromagnetic energy conversion, a system model of RMBMA was developed to analyze the radiation efficiency and radiation power. Meanwhile, in different infinite uniform medium, the distribution and attenuation characteristics of time-varying magnetic field generated by a rotating permanent magnet were studied. Finally, by developing a prototype, the near magnetic field characteristics and 2FSK signal loading characteristics were experimentally tested, and the feasibility and effectiveness of the proposed scheme were verified.