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Method for obtaining encoder scale graduation error

A technology of scale scale and scale error, applied in the direction of instruments, etc., can solve the problem of high cost of scale scale error on the encoder

Active Publication Date: 2014-12-03
联影(常州)医疗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention solves the problem of high cost of obtaining scale errors on the encoder in the prior art

Method used

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  • Method for obtaining encoder scale graduation error
  • Method for obtaining encoder scale graduation error
  • Method for obtaining encoder scale graduation error

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0058] In this embodiment, the encoder for measuring the rotation angle of the gantry in the CT equipment is taken as an example for illustration. The encoder may be a magnetic grid encoder or a grating encoder, and the frame is a rotating part in the CT equipment, and the CT equipment scans the patient through the rotation of the frame. In other embodiments, the encoder can also be used to measure the displacement of other equipment, such as elevators, servo motors, machine tools, and the like.

[0059] As described in step S21 , based on the first time stamp corresponding to each actual scale, the average speed between scales of every two adjacent actual scales of the encoder under the first rotational speed movement is calculated.

[0060] Specifically, in this embodiment, the encoder is used to measure the rotation angle of the gantry in the CT equipment, and rotate the gantry under the first torque so that the gantry rotates stably at a speed not exceeding the design rota...

Embodiment 2

[0105] For some systems that require higher error precision, the technical solution of the present invention provides the second embodiment. The difference between Embodiment 2 and Embodiment 1 is that it also includes repeating the scale error update step until the scale error meets the accuracy requirements; the same parts of Embodiment 2 and Embodiment 1 will not be repeated, and the following will focus on the different parts of the two. .

[0106] Updating the scale error of the encoder scale includes: based on the first time stamp corresponding to each actual scale, according to v 1n '=(δ n -δ n-1 +a) / (t 1n -t 1（n-1） ) Calculate the average speed between the scales of every two adjacent actual scales of the encoder under the first rotational speed movement after updating, v 1n ' is the average speed between the nth actual scale and the n-1th actual scale of the encoder under the first rotational speed movement after updating;

[0107] Obtaining the first speed sign...

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Abstract

Provided is a method for obtaining encoder scale graduation error. The method comprises the following steps: calculating the average speed between the graduations of every two adjacent actual graduations when an encoder moves at a first rotating speed and at a second rotating speed according to a first time stamp and a second time stamp corresponding to each actual graduation; obtaining a first speed signal when the encoder moves at the first rotating speed and a second speed signal when the encoder moves at the second rotating speed according to the average speed between the graduations of every two adjacent actual graduations when the encoder moves at the first rotating speed and at the second rotating speed; carrying out low-pass filtering process on the first speed signal and the second speed signal to obtain the average speed of the encoder at the first rotating speed and at the second rotating speed; and obtaining the graduation error of each actual graduation according to V1 - V2 = (delta n + na) ( 1 / t1n- 1 / t2n). According to the method for obtaining the encoder scale graduation error provided in the technique method of the invention, the cost in obtaining the encoder scale graduation error can be reduced, and high-precision graduation error can be obtained.

Description

technical field [0001] The invention relates to the technical field of error measurement, in particular to a method for obtaining the scale error of a scale on an encoder. Background technique [0002] An encoder is a device that encodes a signal or data and converts it into a signal form that can be used for communication, transmission and storage. An encoder that converts angular displacement into an electrical signal is called a code disc, and an encoder that converts linear displacement into an electrical signal is called a yardstick. According to the different working principles of encoders, encoders can be divided into photoelectric encoders, magnetoelectric encoders and contact brush encoders. [0003] The basic principle of an encoder is to use an electronic component (read head) to sense signal changes on a scale. Taking the magnetic grating encoder as an example, the scale is composed of a series of magnetic substances separated by north and south poles. During ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D18/00
Inventor 季敏
Owner 联影(常州)医疗科技有限公司
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