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Measuring method and device for absolute encoders

A technology of absolute value encoder and measurement method, which is applied in the direction of measurement device, instrument, conversion sensor output, etc., can solve problems such as accident, malfunction of actuator, unit failure, etc., and achieve the effect of improving accuracy

Active Publication Date: 2017-10-17
BEIJING ETECHWIN ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the encoder is automatically cleared in pulse counting, that is to say, whether it is a single-turn absolute value or a multi-turn absolute value, after the data reaches the maximum value, the data will overflow, that is, the encoder is rotated again, and the data It will automatically return to the 0 value, and then re-accumulate the count, resulting in an error in the calculation of the displacement and a jump
Taking the blade angle of the pitch system of wind power generators in the field of wind power as an example, the jump of encoder data will cause the unit to fail, causing unnecessary shutdown and loss of power generation, and reducing the availability of the unit
In addition, this characteristic of the encoder leads to the fact that when the encoder is used for measurement, it can only measure the displacement value within a certain range, especially in industrial control, it cannot be used to measure a long distance or a large angle range
More seriously, when the calculated displacement jumps, it may also cause errors in the logic of the controller, resulting in misoperation of the actuators in the system, causing equipment failures or even accidents

Method used

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  • Measuring method and device for absolute encoders
  • Measuring method and device for absolute encoders
  • Measuring method and device for absolute encoders

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] figure 1 Shows a flow chart of a measurement method for an absolute encoder in the first embodiment of the present invention, please refer to figure 1 , The measurement methods for absolute encoders include S110, S120, S130 and S140.

[0025] In S110, read the current reading value of the encoder.

[0026] There are many engraved lines on the optical code disc of absolute encoder, and each engraved line is arranged in order of 2 lines, 4 lines, 8 lines, 16 lines... so that at each position of the encoder, by reading each engraved line To obtain a set of unique binary codes from zero to 2 to the power of n. The current reading value of the encoder is determined by the mechanical position of the encoder, and it is not affected by power failure or interference.

[0027] In S120, the reading difference between the current reading value and the initial reading value of the encoder is obtained.

[0028] When the encoder is powered on for the first time, read the reading value of the...

Embodiment 2

[0037] figure 2 Shows a flow chart of a measurement method for an absolute encoder in the second embodiment of the present invention, please refer to figure 2 The measurement methods used for the absolute encoder include S210, S220, S230, S240, and S250. The S210, S220, S230, and S240 in this embodiment are the same as the S110, S120, S130, and S140 in the first embodiment. In this embodiment, S250 is added, and S250 is executed after S220 and before S230.

[0038] In S210, read the current reading value of the encoder.

[0039] In S220, the reading difference between the current reading value and the initial reading value of the encoder is obtained.

[0040] In S250, if the reading difference is greater than or equal to the overflow threshold, the maximum reading of the encoder is subtracted from the reading difference; if the reading difference is less than or equal to the negative overflow threshold, the The difference in readings is added to the maximum reading of the encoder....

Embodiment 3

[0046] image 3 A flow chart showing a measurement method for an absolute encoder in the third embodiment of the present invention, please refer to image 3 , The measurement methods used for the absolute encoder include S310, S320, S330, S340, S350 and S360~S380. Among them, S310, S320, S330, S340, and S350 in this embodiment are the same as those in the second embodiment. S230, S240 and S250 are the same. In this embodiment, the verification steps of S360 to S380 are newly added. The verification step may be performed by the maintenance personnel during the working process of the encoder.

[0047] In S310, read the current reading value of the encoder.

[0048] In S320, the reading difference between the current reading value and the initial reading value of the encoder is obtained.

[0049] In S350, if the absolute value of the reading difference is greater than or equal to the overflow threshold, the reading difference is compensated for the maximum reading of the encoder.

[0050...

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Abstract

The embodiment of the invention provides a measuring method and device used for an absolute value encoder. The method comprises: reading the current reading value of an encoder; obtaining the reading value difference between the current reading value and the initial reading value of the encoder; if the reading value difference reaches an overflow threshold, adjusting the initial reading value to be the current reading value, and updating the adjusting times of the initial reading value, wherein the overflow threshold is half of a greatest reading value of the encoder; and obtaining a current measuring value according to the adjusting times, the overflow threshold and the reading value difference. According to the technical scheme, when the reading value difference between the current reading value and the initial reading value of the encoder reaches the overflow threshold, the initial reading value is adjusted to be the current reading value; through adjusting the initial reading value of the encoder, the difference of the encoder is indirectly adjusted, and thereby the measuring scope of the encoder is expanded.

Description

Technical field [0001] The invention relates to the technical field of wind power generation, in particular to a measuring method and device for an absolute value encoder. Background technique [0002] In current industrial control, it is often necessary to measure displacements such as angle, length, and position, such as the length of the conveyor belt movement and the angle the equipment has rotated. The commonly used methods are laser ranging or grating measurement, but laser ranging equipment is more expensive and can only be used to measure straight-line distances, not curve displacements or angles. Grating measurement needs to lay a large range of gratings, the cost is also very high, it is not suitable for long-distance measurement, and the requirements for the cleanliness of the grating surface are extremely high, any pollution on the grating surface will cause displacement measurement errors. [0003] Compared with laser ranging or grating measurement method, photoelectr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/347
CPCG01D5/34792
Inventor 马磊卢勇
Owner BEIJING ETECHWIN ELECTRIC