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Strain detector with magnetostrictive elements
| Details |
Inventors: Sato, Hiroshi; Utsui, Yoshihiko; Ikeda, Hideo; Hamamura, Chiyo;
Assignee: Mitsubishi Denki Kabushiki Kaisha (JP)
Primary Examiner: Ruehl; Charles A.
Assistant Examiner:
Attorney, Agent or Firm: Leydig, Voit & Mayer
A strain detector for detecting a strain developed in a shaft applied with a torque comprises strain-sensitive magnetostrictive elements attached to the shaft in two groups in a chevron pattern. A pair of annular detection coils are wound around a bobbin to surround respective one of the groups of magnetostrictive elements. Two annular yokes made of a soft magnetic material of high permeability are disposed around respective coils across radial gaps. A hollow cylindrical shield of non-magnetic material with a high electrical conductivity is disposed around the two yokes across radial gaps. The magnetostrictive elements may be made of a nickel-iron alloy of 45 to 55% Ni-Fe. The yokes may be made of a nickel-iron alloy of about 80% Ni-Fe or alternatively, of a 6.5% Si-Fe steel. The detector may comprise a second magnetic shield disposed around the first shield of non-magnetic material with a high electrical conductivity. The second shield may be made of the same magnetic material as the yokes. |
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DETAILED DESCRIPTION It is therefore a primary object of this invention to provide a non-contact type strain detector of the above type which has enhanced detection accuracy and sensitivity.
More particularly, this invention aims at providing a strain detector which is protected from exterior magnetic disturbances and in which the magnetic yokes surrounding the detection coils for passing the magnetic flux therethrough are free from application of stresses from other members so that accurate strain detection is ensured.
It is a further object of this invention to provide a strain detector which does not generate acoustic noises in the yokes and in which the measurement is not disturbed by the magnetostriction of the magnetic yokes.
It is an additional object of this invention to provide a strain detector whose assembly steps, especially the winding step of the detection coils or that of the magnetic yokes, can be performed easily.
The strain detector according to this invention comprises, in addition to the magnetostrictive elements attached to the shaft whose strain is to be measured, a detection coil surrounding the magnetostrictive elements, a hollow cylindrical yoke of a soft magnetic material of high permeability which surrounds the detection coil, and a hollow magnetic shield surrounding the yoke, wherein radial gaps are formed between the yoke and the coil and between the yoke and the shield.
The magnetic yoke enhances the detection sensitivity and the magnetic shield provides protection against external magnetic disturbances.
In addition, thanks to the provision of the radial gaps mentioned above, the magnetic yoke is freed from external stresses which may develop strains in the yoke to vary the permeability thereof.
Hence the adverse effects of such stresses on the accuracy of the strain measurement are minimized.
In a preferred form, the magnetostrictive elements are made of a nickel-iron alloy containing 45 to 55 wt.
% nickel.
On the other hand, the yoke is preferably made of a soft magnetic materal of high permeability with zero or negligible magnetostriction, such as a nickel-iron alloy containing 70 to 80 wt
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MEMS 
