Title:
MAGNETOSTRICTIVE TORQUE SENSOR
Document Type and Number:
Japanese Patent JP3252004
Kind Code:
B2
Abstract:
PURPOSE: To achieve a smaller size and a less thickness of a magnetorstrictive torque sensor.
CONSTITUTION: A coil so arranged to laminate a 8-shaped exciting coil 1 and a detection coil 2 concentrically is arranged as opposed near a shaft 3 having a magnetostrictive effect. The magnetic permeability of a surface portion of the axis changes differentially in the direction of ±45° by an applied torque. Therefore, two cases appear depending on the direction of torque. In one case, a magnetic flux turns to (c) to (b) with the rising of an excitation current and in the other, it turns from (d) to (a). (the direction may be opposite to that in this combination) An axial circumference component of a magnetic flux proportional to the torque interlinks with the detection coil to generate an induced voltage and the phase thereof depends on the polarity of the torque. The induced voltage is rectified in synchronization to obtain an output.
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Inventors:
Ichiro Sasada
Application Number:
JP4429593A
Publication Date:
January 28, 2002
Filing Date:
January 24, 1993
Export Citation:
Assignee:
Ichiro Sasada
International Classes:
G01L3/10; (IPC1-7): G01L3/10
Domestic Patent References:
| JP3231127A | ||||
| JP649330A | ||||
| JP6201493A |
Attorney, Agent or Firm:
Masashi Kobori (1 person outside)