Low frequency vibrator

Details Low frequency vibrator Low frequency vibrator

H - Electricity

02

K

H02K 33/16 (2006.01) H02K 33/00 (2006.01)

Patent

CA 2379534

A low frequency vibrator has a stator member (10) with a cylindrical, central chamber (12), a cylindrical, tubular liner of low friction, non-ferromagnetic material (18) positioned in the chamber (12) to form a bearing, and a cylindrical, ferromagnetic, reciprocating piston (20) slidably mounted in the liner (18). The stator (10) has a pair of coils (30, 32) and a permanent magnet (44) is positioned centrally in the reciprocating piston (20). A ferromagnetic flux conductor surrounds the coils (30, 32) and extends between opposite ends of the chamber (12). This structure creates a magnetic spring, having a spring constant K. The ratio of K to the mass M of the reciprocating piston (20) is made substantially equal to the square of a radian frequency in the operating frequency range of the vibrator.

L'invention concerne un vibreur basse fréquence comportant un stator (10) à chambre centrale cylindrique (12). La chambre (12) est équipée d'une garniture cylindrique tubulaire en matériau non ferromagnétique à frottement réduit (18), cette garniture formant un palier. Par ailleurs, un piston alternatif cylindrique en matériau ferromagnétique (20) est monté coulissant dans la garniture (18). Le stator (10) comprend une paire de bobines (30, 32), et un aimant permanent (44) occupe une position centrale dans le piston alternatif (20). Un conducteur à flux ferromagnétique qui entoure les bobines (30, 32) s'étend entre les extrémités opposées de la chambre (12). Cette structure forme un ressort magnétique, K étant la constante du ressort. On fait en sorte que le rapport de K à la masse M du piston alternatif (20) soit sensiblement équivalent au carré d'une fréquence angulaire dans la gamme de fréquences d'exploitation du vibreur.

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