Permanent magnet type linear electromagnetic actuator

Details Permanent magnet type linear electromagnetic actuator Permanent magnet type linear electromagnetic actuator

1986-12-16

1987-10-27

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335229, H01F 708

Patent

active

047032979

ABSTRACT:
In the permanent magnet type actuator, an armature made of a hollow cylindrical permanent magnet is held to be movable in its axial direction. A stator made of an electromagnet comprises a magnet core having two portions one placed outside of the permanent magnet and the other placed inside of the same, thereby applying a unipolar magnetic field to the armature. A plurality of inductor teeth are formed on the surfaces of the core portions opposing to each other, and means are further provided for energizing a coil of the electromagnet by an exciting current and driving the armature in its axial direction.

REFERENCES:
patent: 3169550 (1965-02-01), Reader
patent: 4602232 (1986-07-01), Umehara et al.
IBM Technical Disclosure Bulletin, Linear Actuator, vol. 15, No. 3, Aug., 1972, p. 917.

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