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Rotation detection device

A technology of rotation detection and detection part, which is applied in the direction of measuring device, adopting electric device, converting sensor output, etc., and can solve the problems such as difficult magnetic flux concentration

Inactive Publication Date: 2019-11-22
HIROSE ELECTRIC GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the arrangement of the magnet and the magnetic sensor in the above-mentioned new rotation detection device, it is difficult for the magnetic flux to concentrate on the magnetic wire when the magnet approaches the magnetic sensor.

Method used

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Embodiment Construction

[0056] (rotation detection device)

[0057] figure 1 A rotation detection device 1 according to an embodiment of the present invention is shown. figure 2 show from figure 1 Observe the state of the rotation detection device 1 in the arrow II direction, image 3 show from figure 2 Observe the state of the rotation detection device 1 in the arrow III direction. The rotation detection device 1 is, for example, a device that detects the rotation of an object to be detected such as a motor. figure 1 The reference axis Z in is the rotation axis of the object to be detected. When describing the structure of the rotation detection device 1 , for convenience of description, the direction on one side of the reference axis Z pointed by the arrow d is set as downward, and the direction on the other side of the reference axis Z pointed by the arrow u is set as upward.

[0058] Such as figure 1 As shown, the rotation detection device 1 includes four magnetic field forming units 11 ...

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Abstract

Minimization of a rotation detection device is realized, and the rotation detection precision of the rotation detection device is improved. Four magnetic field forming units are separated from each other and arranged along a circle that takes a point on a reference axis as the center. Two magnetic poles of each magnetic field forming unit are arranged on the radial direction of the circle. Three magnetic field detection units are separated from each other, arranged over a region provided with the magnetic field forming units, and arranged along a circle that takes a point on a reference axis as the center. The axes of the magnetic wires of each magnetic field detection unit extend in a plane that contains the circle and incline relative to the radial direction and tangent line direction ofthe circle. Three magnetic flux control units are arranged under three magnetic field detection units. Each magnetic flux control unit is provided with a magnetic part that covers a part of the magnetic field detection units so that the direction of the magnetic flux changes in a mode that the magnetic flux of the magnetic fields formed by the magnetic field forming units goes through the magnetic wires of the magnetic field detection units along the axis direction of the magnetic wires of the magnetic field detection units.

Description

technical field [0001] The present invention relates to a rotation detection device that detects rotation of an object to be detected using magnetism. Background technique [0002] There is known a rotation detection device using a magnetic sensor and a magnet utilizing the large Barkhausen effect. In such a rotation detection device, for example, a magnetic sensor is fixed to a support, a magnet is fixed to a rotating body rotating relative to the supporting body, and the magnetic sensor detects a change in a magnetic field generated by the rotation of the rotating body. The magnetic sensor is formed by winding a coil around a magnetic wire that produces the large Barkhausen effect. A magnetic wire that exhibits the large Barkhausen effect has the property that the direction of magnetization is instantaneously reversed when the external magnetic field changes. When the magnetization direction of the magnetic wire is reversed, the current flowing through the coil is taken ...

Claims

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Application Information

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IPC IPC(8): G01D5/249
CPCG01D5/249G01B7/30G01P3/487G01D5/145G01P3/4815
Inventor 春日敦史
Owner HIROSE ELECTRIC GROUP
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