Magnetostrictive roller drive motor

Details Magnetostrictive roller drive motor Magnetostrictive roller drive motor

1991-01-10

1992-01-07

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Reciprocating

310 83, 310265, 367156, H04R 1500

Patent

active

050794604

ABSTRACT:
A magnetostrictive drive motor having a rotary drive shaft in the form of a drum which is encircled by a plurality of substantially equally spaced roller members in the form of two sets of cones which are in contact with respective cam surfaces on the inside surface of an outer drive ring. The drive ring is attached to sets of opposing pairs of magnetostrictive rods. Each rod in a pair are mutually positioned end to end within respective energizing coils. When one of the coils in an opposing pair is energized, the energized rod expands while the other rod is caused to contract, causing the drive ring to rock, i.e. rotate slightly in either the clockwise or counterclockwise direction, depending upon which rod in a pair is energized. As the drive ring is activated in repetitive cycles in either direction, one set of drive cones attempt to roll up their respective cam surface but are pinned between the drive shaft drum and the drive ring. As the frictional force preventing sliding builds up, the cones become locked, setting up reaction forces including a tangential component which is imparted to the drive shaft drum to provide a source of motor torque. Simultaneously the other set of cones are disengaged from the drive shaft drum. By repetitively cycling the energization of the magnetostrictive rods, the drive shaft drum indexes in microradian rotational steps.

REFERENCES:
patent: 3459126 (1969-08-01), Nyman
patent: 4901293 (1990-02-01), Kuhn
patent: 4907209 (1990-03-01), Sewell et al.
patent: 4914330 (1990-04-01), Pierrat
"An Application of Giant Magnetotstrictive Material to High Power Actuators", T. Akuta, Proceedings, 10th International Workshop on Rare Earth Magnets and Their Applications, May 16-19, 1989, pp. 359-368.
"Ultrasonic Motor", Panasonic Technical Reference, Electric Motor Division, Matsushita Electric Industrial Co., Ltd. pp. 1-10.

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