Abstract: The interaction between the permanent magnet and the moving conductor is analyzed in detail, and a novel noncontact driving mode is discovered. A magnet can be driven to rotate around its central axis by moving a non-ferromagnetic conductor under it. From the molecular current viewpoint, an analytic expression exactly describing the magnetic field distribution of a rectangular permanent magnet is derived from the Blot - Savart＇s law. And the force on the permanent magnet is calculated quantitatively when the conductor is moving five millimeters under the permanent magnet. Finally a new explanation for magnetic levition force is proposed and the inexplicit explanation on the principle of magnetic levitation experimental apparatus by PASCO company is clarified and the reason is presented for that the lift phenomena can only be observed in constrained case.

Key words: permanent magnet, non-magnetic moving conductor, noncontact driving, magnetic levitation