| 摘要 |
A low frequency vibrator has a stator member with a cylindrical, central chamber, a cylindrical, tubular liner of low friction, non-ferromagnetic material positioned in the chamber to form a bearing and a cylindrical, ferromagnetic, reciprocating piston slidably mounted in the liner. The stator has a pair of coils and a permanent magnet is positioned centrally in the reciprocating piston. A ferromagnetic flux conductor surrounds the coils and extends between opposite ends of the chamber. This structure creates a magnetic spring, having a spring constant K. The ratio of K to the mass M of the reciprocating member is made substantially equal to the square of a radian frequency in the operating frequency range of the vibrator.
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