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Variable flux rotating speed sensor

A technology of speed sensor and variable magnetic flux, which is applied in the direction of devices using electric/magnetic methods, can solve the problems of inability to meet application requirements, difficulty in miniaturization of variable magnetic flux speed sensors, and output voltage drop, etc., to increase product load capacity, effective use of space, and the effect of increasing the output voltage

Active Publication Date: 2022-07-22
SICHUAN XINCHUAN AVIATION INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved and the technical task proposed by the present invention are to improve the existing technology and provide a variable magnetic flux speed sensor, which solves the problem that the variable magnetic flux speed sensor in the current technology is difficult to effectively miniaturize, and the output voltage when miniaturized Significant decline, unable to meet application requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] like figure 1 As shown, a variable magnetic flux rotational speed sensor mainly includes a trigger wheel 1, a coil assembly and a permanent magnet 2, the coil assembly includes a soft magnetic core 3 and a measuring coil 4 wound on the soft magnetic core 3, the triggering The wheel 1 is used to be connected to the rotating object to be tested and rotate with it, the permanent magnet 2 is located on the radial side of the trigger wheel 1, the coil assembly is located between the permanent magnet 2 and the trigger wheel 1, and the coil assembly A magnetic field guide member 5 made of soft magnetic material is arranged between the permanent magnet 2 and the magnetic field guide member 5 changes the magnetic field distribution around the permanent magnet 2 to guide the magnetic field of the permanent magnet 2 into the permanent magnet 2 more effectively. The soft magnetic core 3, the magnetic field guide member 5 intercepts the native magnetic field applied by the permanent...

Embodiment 2

[0039] like Image 6 As shown, the difference from the first embodiment is that the main body portion 51 of the magnetic field guide member 5 has a special-shaped structure, and the thickness of the main body portion 51 in the radial direction of the trigger wheel 1 is along the vicinity of the magnetic field guide member 5 and the soft magnetic core. The direction from the connection point of 3 to the connection point away from the magnetic field guide member 5 and the soft magnetic core 3 decreases. The thickness of the main body part 51 is the largest, and the thickness of the main body part 51 away from the connection between the main body part 51 and the end body 32 of the soft magnetic core 3 decreases smoothly (it can be a linear decrease or a curvilinear decrease). In the embodiment, the end body 32 of the soft magnetic core 3 is close to the edges on both sides of the permanent magnet 2, so that the thickness of the main body portion 51 close to the two sides of the p...

Embodiment 3

[0042] like Figure 7 As shown, the difference from the first embodiment is that end bodies 32 are also arranged between the measuring coils 4 arranged at intervals along the same axis, which is equivalent to the series connection of a plurality of soft magnetic cores 3 with an I-shaped structure. In this embodiment Among them, two of the measuring coils 4 are arranged at intervals, and three of the end bodies 32 are arranged in total, so that the soft magnetic core 3 is in the shape of a king. By measuring the magnetic field of the coil, the output voltage is increased, the internal resistance of the product is reduced, and the load capacity of the product is improved.

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Abstract

The invention discloses a variable flux rotating speed sensor which comprises a trigger wheel, a coil assembly and a permanent magnet, the coil assembly comprises a soft magnetic core and a measuring coil wound on the soft magnetic core, the trigger wheel is used for being connected to a measured rotating object and rotating along with the measured rotating object, the permanent magnet is located on one radial side of the trigger wheel, and the coil assembly is located between the permanent magnet and the trigger wheel. A magnetic field diversion member made of a soft magnetic material is arranged between the coil assembly and the permanent magnet; and the magnetic field diversion member changes the magnetic field distribution around the permanent magnet so as to effectively guide the magnetic field of the permanent magnet into the soft magnetic core. According to the variable-flux rotating speed sensor, the magnetic field diversion component is utilized to fully guide the magnetic field applied to the side where the trigger wheel is located by the permanent magnet into the soft magnetic core, the magnetic field penetrating through the measuring coil is optimized, the output voltage is increased, the internal resistance of a product is reduced, the load capacity of the product is improved, the space is effectively utilized, miniaturization can be achieved, and the reliability is high. And the output voltage can meet the application requirements.

Description

technical field [0001] The invention relates to the technical field of rotational speed sensors, in particular to a variable magnetic flux rotational speed sensor. Background technique [0002] The traditional variable magnetic flux speed sensor includes a trigger wheel, a soft magnetic core, a measuring coil and a permanent magnet. The measuring coil is wound on the soft magnetic core, and the trigger wheel is installed on the measured rotating object to rotate with the measured rotating object. The magnetic core and the measuring coil are located between the trigger wheel and the permanent magnet. The permanent magnet is stationary. When the trigger wheel rotates, the reluctance of the air gap changes, which leads to the change of the magnetic flux passing through the measuring coil, thereby generating an induced electromotive force on the measuring coil. , and then an AC signal is generated in the measuring coil, and the rotation speed of the trigger wheel can be obtained...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/46
CPCG01P3/46
Inventor 黎世清黄鑫赵维乐周弦蒋常琼
Owner SICHUAN XINCHUAN AVIATION INSTR
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