Linear drive device

Electrical generator or motor structure – Dynamoelectric – Linear

Patent

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Details

318135, H02K 4100

Patent

active

059491612

ABSTRACT:
A linear drive device comprising a shaft extending in a predetermined direction and provided with a field magnet having N- and S-type magnetic poles; and a movable piece having an armature coil fitted around the shaft and opposed to the field magnet for generating a thrust when energized, being reciprocatable along the shaft, and connected to one end of a driven object, wherein thrusts generated by the armature coil at opposite sides of the shaft are determined such that the thrust generated at the side near the driven object is larger than the thrust generated at the side remote from the driven object. A linear drive device comprising a guide member; a movable piece engaged with the guide member for reciprocation along the guide member; and a sensor arranged on the movable piece for reading information on the guide member, wherein the sensor arranged on the movable piece is located substantially at a center of a yawing or pitching motion of the movable piece.

REFERENCES:
patent: 5072144 (1991-12-01), Saito et al.
patent: 5536983 (1996-07-01), Avaki et al.
patent: 5801462 (1998-09-01), Yagoto et al.

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