Torque sensor for detecting a shaft torque and an electric machi

Details Torque sensor for detecting a shaft torque and an electric machi Torque sensor for detecting a shaft torque and an electric machi

1989-01-27

1992-08-25

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

310 68B, G01L 310

Patent

active

RE0340391

ABSTRACT:
A torque sensor of noncontact type, by which can be stably measured the torque of a shaft with a sufficient S/N ratio under the influence of external magnetic noise, such as an induction magnetic flux which is produced in an induction motor, and which can be readily disposed in a comparatively small space. When provided on an induction motor, the torque sensor is mounted on the induction motor in noncontacting relationship. The torque sensor detects the torque of the shaft and includes a pair of magnetic material members provided on respective circumferential portions of the peripheral surface of a shaft. A pair of magnetic detectors are disposed at opposite locations at which external magnetic fields having opposite phase exist. The detectors detect the variation of the magnetic characteristics of the magnetic materials, and a signal processing circuit produces a mean value of output signals obtained from the magnetic detectors.

REFERENCES:
patent: 2457700 (1948-12-01), Martin et al.
patent: 4364278 (1982-12-01), Horter et al.
patent: 4414856 (1983-11-01), Winterhoff
patent: 4432245 (1984-02-01), Hattori et al.
patent: 4590807 (1986-05-01), Kobayashi et al.
SAE Technical Paper Series 820206, "Noncontact Miniature Torque Sensor for Automotive Application", W. Fleming et al.; Feb. 22-26, 1982.

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