Voice coil-type linear motor

Details Voice coil-type linear motor Voice coil-type linear motor

1988-07-07

1989-12-19

Salce, Patrick R.

Electrical generator or motor structure

Dynamoelectric

Linear

310 44, 369 45, 402K 4102

Patent

active

048885061

ABSTRACT:
A voice coil-type linear motor comprising an cylindrical outer yoke made of a ferromagnetic material; a cylindrical center yoke made of a ferromagnetic material and magnetically coupled with the outer yoke; an integral, cylindrical magnet consisting essentially of an R-B-Fe alloy wherein R is at least one of rare earth metals such as Nd, Pr and Dy and having magnetic anisotropy in a radial direction, the cylindrical magnet being fixed to an inner surface of the outer yoke; a protective member made of a nonmagnetic and conductive material and fixed to a surface of the cylindrical magnet; and a movable coil means arranged in a magnetic gap between the center yoke and the cylindrical magnet.

REFERENCES:
patent: 3723779 (1973-03-01), Gillum
patent: 3723780 (1973-03-01), Gillum
patent: 4305105 (1981-08-01), Ho
patent: 4780226 (1988-10-01), Sheets et al.
patent: 4792367 (1988-12-01), Lee
patent: 4797866 (1989-01-01), Yoshikawa

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