Position sensor

一种传感器、位移的技术，应用在转换传感器输出、电/磁位置测量、仪器等方向，能够解决狭缝污染物质堵塞、使用、易附着污染物质等问题，达到提高SN比、提高分辨率的效果

Inactive Publication Date: 2010-08-11
AISAN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, optical rotary encoders use light, so there is a problem that contaminants tend to adhere
In addition, if the slit is narrowed in order to improve the resolution, the slit is easily blocked by pollutants, and it is still difficult to use in harsh environments where it is easy to contact with oil, dust, etc.

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0053] Next, a first embodiment in which the position sensor of the present invention is embodied as an "electromagnetic induction rotary encoder" will be described in detail with reference to the drawings.

[0054] figure 1 A schematic configuration diagram of the rotary encoder 1 according to the present embodiment is shown. As an example, the rotary encoder 1 is provided corresponding to the crankshaft 3 of the engine 2, and is used to detect the operating position (rotation angle) of the crankshaft 3 corresponding to the movable body of the present invention. The rotary encoder 1 includes: an excitation substrate 5 including an excitation coil 4; a detection substrate 8 fixed on the crankshaft 3 opposite to the excitation substrate 5 and including a detection coil 7 disposed opposite to the excitation coil 4 through a gap 6; A controller 9 that outputs an excitation signal to the excitation coil 4 and processes a detection signal output from the detection coil 7 ; and a ...

no. 2 approach

[0068] Next, a second embodiment in which the position sensor of the present invention is embodied as an "electromagnetic induction rotary encoder" will be described in detail with reference to the drawings.

[0069] In addition, in each embodiment described below, the same code|symbol is attached|subjected to the same component as 1st Embodiment, description is abbreviate|omitted, and it demonstrates centering on a difference.

[0070] Figure 8 It is an enlarged perspective view showing a part of the excitation substrate 5 in this embodiment. Figure 9 It is an enlarged perspective view showing a part of the detection substrate 8 in this embodiment. Figure 10 It is a block diagram showing the electrical configuration of the rotary encoder 31 in this embodiment. In this embodiment, the configurations of the excitation substrate 5 , the detection substrate 8 , and the controller 9 are different from those of the first embodiment.

[0071] That is, if Figure 8 As shown, t...

no. 3 approach

[0076] Next, a third embodiment in which the position sensor of the present invention is embodied as an "electromagnetic induction rotary encoder" will be described in detail with reference to the drawings.

[0077] Figure 12 It is an enlarged perspective view showing a part of the excitation substrate 5 in this embodiment. Figure 13 It is a block diagram showing the electrical configuration of the rotary encoder 32 in this embodiment. In this embodiment, the structures of the excitation substrate 5 , the detection substrate 8 , and the controller 9 are different from those of the first embodiment.

[0078] That is, if Figure 12 As shown, a reference excitation coil 14 is provided inside the excitation coil 4 of the excitation substrate 5 , wherein the reference excitation coil 14 is an excitation coil with only one bending pattern 13 in one place for each rotation of the crankshaft 3 . In addition, a reference detection coil 15 is disposed inside the detection coil 7 of...

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PUM

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Abstract

An electromagnetic induction type rotary encoder includes an excitation board including an excitation coil, a detection board fixed to a movable element to face the excitation board and including a detection coil placed to face the excitation coil with a clearance therefrom, and a controller for outputting an excitation signal to the excitation coil and processing a detection signal output from the detection coil. The controller includes an excitation circuit for exciting the excitation coil at high frequency and a high-frequency generating circuit, a demodulation circuit for demodulating a signal from the detection coil in accordance with excitation to the excitation coil, a waveform shaping circuit for waveform shaping a signal from the demodulation circuit, and a pulse generating circuit for outputting a pulse signal based on the signal from the waveform shaping circuit. Each of the excitation coil and the detection coil is formed in a meandering coil pattern.

Description

technical field [0001] The present invention relates to a position sensor used for detecting the action position of a movable body. Background technique [0002] Conventionally, as such a technique, a rotation sensor widely used in various fields can be mentioned. In an automobile engine, a crankshaft position sensor (crank angle sensor), which is one of the rotation sensors, is used to detect the rotation speed and the rotation phase. An example of such a crank angle sensor is described in Patent Document 1 below. [0003] As a typical crankshaft position sensor, a sensor using a magnetic pickup is known. A typical method of use is as follows: Place a magnetic pickup consisting of a magnet and a coil against a gear-shaped magnetic material installed on the rotating shaft, and change the distance from the magnetic pickup to the magnetic material according to the change in the gap distance between the pickup and the magnetic Pickup output voltage waveform. The problem wit...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01D5/245
CPCG01B7/003G01D5/2066G01B7/30
Inventor井上铁治
OwnerAISAN IND CO LTD