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Torque detection sensor

A technology of torque detection and sensors, which is applied in the direction of torque measurement, instruments, measuring devices, etc., and can solve the problems of large sensors and increased processing costs

Inactive Publication Date: 2022-01-18
SHINANO KENSHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, since the detection coil and the core need to be buried using the radial thickness of the insulating cylinder, the sensor tends to be enlarged in the radial and axial directions
In addition, since the end surfaces of the legs on both sides constituting the core are set to face the object to be detected, it is necessary to form the end surfaces into an arc-shaped curved surface rather than a flat surface, which increases the processing cost

Method used

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Examples

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Embodiment Construction

[0041] Hereinafter, an embodiment of the torque detection sensor of the present invention will be described with reference to the drawings. First, refer to Figure 1 ~ Figure 1 3. The general configuration of the torque detection sensor 1 will be described.

[0042] As an example of the object to be detected, it is desirable to use a material having a large inverse magnetostrictive effect. For example, as a material with a large inverse magnetostrictive effect, there are Permende alloy (Japanese: パーメンジュール), Fe-Al (aluminum-iron alloy), Fe-Nix (Permalloy), and spherical graphite cast iron (JIS: FCD70) Wait. In addition, the inverse magnetostrictive effect is a phenomenon in which magnetic properties change when stress is applied to the magnet from the outside. In addition, if the object to be detected is subjected to magnetic annealing in advance as necessary, the torque acting on the object to be detected can be appropriately detected as will be described in detail later. ...

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Abstract

The invention provides a self-excitation type torque detection sensor, which can be miniaturized and mass-produced at low cost, and can detect the compression stress and tensile stress generated at the whole periphery of a detected body without reducing detection sensitivity. The self-excitation type torque detection sensor comprises a plurality of first pole teeth (3a) and second pole teeth (3b) which are provided so as to protrude in a comb-tooth arrangement in the circumferential direction of an annular core (2); and a plurality of energizing circuits (6a, 6b) connected in series to a first coil (5a) and a second coil (5b) wound around the first pole tooth (3a) and the second pole tooth (3b) in different winding directions, wherein a plurality of magnetic circuits having an inclination of + 45 degrees and a plurality of magnetic circuits having an inclination of -45 degrees with respect to the axial direction formed by the object to be detected are respectively formed between the first pole tooth (3a) and the second pole tooth (3b) by energizing the plurality of energizing circuits (6a, 6b).

Description

technical field [0001] The invention relates to a self-excitation torque detection sensor. Background technique [0002] There is a magnetostrictive torque detection device as a method of detecting torque acting on an object to be detected such as a rotating shaft without contact. For example, torque is detected by measuring the magnetostrictive effect by applying a surface treatment (for example, plating or grooving) to the surface of a shaft (shaft portion) that is a subject to detect strain to increase magnetostrictive properties. The magnetostrictive effect is measured by arranging a coil wound coaxially with the shaft and reading a change in the magnetic permeability of the shaft due to the Villari effect based on the magnitude of impedance. [0003] As a torque detection device, the applicant proposes a magnetostrictive torque detection sensor, which increases the torque detection sensitivity by increasing the magnetic circuits formed between the object to be detected...

Claims

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Application Information

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IPC IPC(8): G01L3/10
CPCG01L3/102G01L3/103
Inventor 古川顕秀
Owner SHINANO KENSHI
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