Measuring and testing – Dynamometers – Responsive to torque
Patent
1990-04-26
1991-11-05
Ruehl, Charles A.
Measuring and testing
Dynamometers
Responsive to torque
G01L 310
Patent
active
050623079
ABSTRACT:
A strain detector wherein external and internal magnetic fields are magnetically separated from each other to eliminate an influence of such disturbance magnetic field to assure accurate and stabilized detection of strain in a drive shaft. The detector comprises a magnetic layer made of a soft magnetic material having a high permeability and suitable magnetostriction fixedly mounted on an outer periphery of a driven shaft, a pair of bearings or bearing stands made of a soft magnetic material having a high permeability for supporting the driven shaft for rotation thereon, a detecting coil disposed around the magnetic layer for detecting a variation of the permeability of the magnetic layer arising from strain of the magnetic layer caused by an external force applied to the driven shaft, and a shield disposed on an outer periphery of the detecting coil and magnetically connected at the axial opposite end portions thereof to the bearings or bearing stands.
REFERENCES:
patent: 3861206 (1975-01-01), Kawafune et al.
patent: 4414855 (1983-11-01), Iwasaki
IEEE Transactions on Magnetics, I. Sasada et al, vol. MAG-20, No. 5, Sep. 1984.
Hamamura Chiyo
Ikeda Hideo
Satoh Hiroshi
Utsui Yoshihiko
Mitsubishi Denki & Kabushiki Kaisha
Ruehl Charles A.
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