Electrical generator or motor structure – Dynamoelectric – Reciprocating
Patent
1996-09-09
1997-12-23
LaBalle, Clayton E.
Electrical generator or motor structure
Dynamoelectric
Reciprocating
318118, H01L 4112
Patent
active
057010439
ABSTRACT:
A magnetostrictive material is used to reduce a displacement by a factor of about 1000 to achieve displacements with subnanometer resolution. The range of motion is about 100 .mu.m. In one embodiment, a longitude of a magnetostrictive material is attached end to end to a soft magnetic material of same shape and permeability. A magnet provides a magnetic field of constant intnesity and length along half of the combined longitude. When the magnet is displaced along the combined longitude, the length of the magnetic field inside the magnetostrictive material changes. This change is accompanied by an equal and opposite change in the magnetic material, and therefore, the magnetic circuit remains undisturbed. The result is a linear and hysteresis free change in the expansion or contraction of the magnetostrictive material, and displacement of one of its ends relative to the other. The displacement from the magnetostrictive material is a small fraction of the displacement of the magnet, the fraction being the mount of strain due to the magnetic field in the magnetostrictive material. In another embodiment, a magnetic circuit is closed by a soft magnetic materail between a magnet and a magnetostrictive material. By varying the length of an airgap in the magnetic circuit, the magnetic intensity, and consequently, the amout of expansion of the magnetostrictive material can be changed. This embodiment provides high resolution but with nonlinearity and hysteresis. All embodiments have essentially creep free performance.
REFERENCES:
patent: 4443731 (1984-04-01), Butler et al.
Jones Judson H.
LaBalle Clayton E.
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