Actuator

Details Actuator Actuator

1989-03-27

1990-07-31

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335272, 310154, H01F 708

Patent

active

049453300

ABSTRACT:
An actuator is disclosed, in which an movable armature and a permanent magnet mounted on a stationary yoke are disposed to face each other with a small gap. The armature has at least one pair of protruding poles which are movable along a predetermined path. The permanent magnet comprises plural pairs of juxtaposed magnetic pieces whose polarities are opposite to each other. The plural pairs of magnetic pieces are arranged in juxtaposition with each other at positions adjacent to the path of the corresponding protruding pole so that adjacent two magnetic pieces of adjacent two pairs have the same polarity with each other. The permanent magnet generates such a magnetic pattern that the amount thereof gradually decreases from both ends of the path of each protruding pole towards the boundary of the magnet pieces of the corresponding pair to avoid the influences due to the reluctance torque and the drive torque.

REFERENCES:
patent: 3500090 (1970-03-01), Baermann
patent: 3970980 (1976-07-01), Nelson
patent: 4794291 (1988-12-01), Abukawa et al.
patent: 4823037 (1989-04-01), Abukawa et al.

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