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Rotary encoder

A technology of rotary encoders and rotating bodies, which is applied in the field of rotary encoders and can solve problems such as poor detection accuracy

Active Publication Date: 2020-09-18
SANKYO SEIKI MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a rotary encoder, there is a problem that induced voltages are generated in wiring, circuits, etc. due to changes in the magnetic field accompanying the rotation of the rotating body (magnet), and this signal component will be different from the signal component from the magnetic sensor. Output signals overlap, resulting in poor detection accuracy

Method used

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Experimental program
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Embodiment approach 1

[0053] 1( a ) and FIG. 1( b ) are schematic diagrams showing the configuration of a rotary encoder according to Embodiment 1 of the present invention. FIG. 1( a ) is a schematic perspective view of a rotary encoder according to the first embodiment, and FIG. 1( b ) is a block diagram of the rotary encoder according to the first embodiment.

[0054] As shown in FIG. 1( a ) and FIG. 1( b ), the rotary encoder 10 according to Embodiment 1 includes a first magnet 20 , a second magnet 30 , a first magnetic sensor unit 40 , a second magnetic sensor unit 50 , and a second magnetic sensor unit 50 . Three magnetic sensor units 60 and a control unit 70 . The first magnet 20 and the second magnet 30 are provided on the rotating body 2 rotating around the rotating axis L, and can rotate together with the rotating body 2 . The first magnetic sensor part 40 , the second magnetic sensor part 50 and the third magnetic sensor part 60 are disposed on the fixed body 1 . For example, the rotati...

Embodiment approach 2

[0076] 3(a) and 3(b) are schematic diagrams showing the configuration of the rotary encoder 10 according to Embodiment 2 of the present invention. FIG. 3( a ) is a schematic perspective view of the rotary encoder 10 according to the second embodiment, and FIG. 3( b ) is a block diagram of the rotary encoder 10 according to the second embodiment. The schematic configuration of the rotary encoder 10 shown in FIG. 3( a ) is the same as that of the first embodiment described above, and therefore its description will be omitted.

[0077] In the rotary encoder 10 according to the second embodiment, as shown in FIG. 80a, 80b, 80c. The output signals from the respective magnetic sensor units 40, 50, and 60 contain harmonic components, but the respective harmonic components of the A-phase signal and the B-phase signal from the third magnetic sensor unit 60 pass through the LPFs 8a, 80b, and 80c. The decrease according to the rotation speed of the rotating body has been confirmed by t...

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Abstract

The present invention provides a rotary encoder that detects the rotational position of a rotating body with high precision. A rotary encoder (10) has a magnet (20, 30) provided on a rotating body, a magnetic sensor part (40, 50, 60) provided on a fixed body, and A control unit (70) for calculating the rotational position of the rotating body by outputting the signal. The control part (70) calculates the current rotation speed of the rotation body by measuring the reception interval of the external request signal related to the calculation of the rotation position of the rotation body, and based on the ratio of the calculated current rotation speed and the reference rotation speed, the reference rotation speed is calculated. The parameter related to the error signal component superimposed on the output signal at the rotation speed is converted into a value at the current rotation speed, based on the converted value, the output signal from the magnetic sensor unit (40, 50, 60) is corrected, and the corrected output signal is used. The signal calculates the rotational position of the rotating body.

Description

technical field [0001] The invention relates to a rotary encoder, in particular to a magnetic rotary encoder. Background technique [0002] As a device for detecting the rotational position of a rotating body with respect to a fixed body, there is known a magnetic rotary encoder using a magnetic sensor such as a magnetoresistive effect (MR) element or a Hall element. In such a rotary encoder, there is a problem that induced voltages are generated in wiring, circuits, etc. due to changes in the magnetic field accompanying the rotation of the rotating body (magnet), and this signal component will be different from the signal component from the magnetic sensor. Output signals overlap, resulting in poor detection accuracy. [0003] Patent Document 1 describes a method of correcting an error caused by the induced voltage by utilizing the fact that the induced voltage is superimposed on the output signal in proportion to the rotational speed of the rotating body. In this method,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/12G01D5/14
CPCG01D5/12G01D5/142G01D5/24476G01D5/2449G01D5/2451
Inventor 奥村宏克斋藤丰上甲均
Owner SANKYO SEIKI MFG CO LTD