Low frequency vibrator

Details Low frequency vibrator Low frequency vibrator

1998-07-24

1999-10-26

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Oscillating

310 15, 310 905, 381150, H02K 3300

Patent

active

059734221

ABSTRACT:
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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