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High-precision signal processing system of sine and cosine encoder

A sine and cosine encoder and signal processing technology, applied in error detection coding, instruments, analog-to-digital converters, etc., can solve problems such as the inability to meet the requirements of the original signal subdivision difference

Pending Publication Date: 2016-09-28
中工科安科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The encoder whose output signal is a TTL square wave, the signal can only be multiplied by 4, which cannot meet the requirements for more subdivision and difference of the original signal

Method used

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  • High-precision signal processing system of sine and cosine encoder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046]1. Incremental rotary encoder signal processing principle

[0047] Under ideal conditions, the incremental rotary encoder outputs two sine and cosine signals with a phase difference of 90 degrees between A and B. When the encoder rotates in the positive direction, the B output signal phase lags the A signal by 90 degrees; on the contrary, when the encoder rotates in the opposite direction, the A output signal phase lags the B signal by 90 degrees. When the encoder rotates in the forward direction, the signal waveform is output, such as Figure 8 as shown, Figure 8 Output signal waveform diagram for the positive rotation of the encoder.

[0048] The initial signal of the encoder needs to be converted and processed before information such as the motor angle position can be obtained. In terms of signal processing, the encoder output signal is divided into two paths, such as Figure 9 as shown, Figure 9 It is a functional block diagram of the rotary encoder signal pro...

Embodiment 2

[0081] Assuming practical application:

[0082] 1. The encoder resolution is 2048 lines;

[0083] 2. The motor speed is 3000rpm;

[0084] 3. The feed rate of the screw rod per revolution of the motor is 5mm, that is, 5mm / r;

[0085] 4. The feed rate resolution reaches 0.0001mm, and the corresponding mechanical angle is 360 / (5 / 0.0001)=0.0072°=25.92″.

[0086] Let the encoder subdivision multiple be N, then: It is obtained that N>24.4, that is, the minimum 25 multiplier. Note: Since the frequency of the encoder interface unit has been multiplied by four, in order to achieve the ideal resolution, it needs to be multiplied by seven times, so that the overall subdivision multiple reaches 28 times.

[0087] When the rotational speed is 3000rpm, such as Figure 8 As shown, the frequency of the encoder output sine and cosine signals is:

[0088] Fine interpolation calculation formula:

[0089] Calculation formula of mechanical rotation angle:

[0090] Speed ​​calculatio...

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Abstract

The invention discloses a high-precision signal processing system of a sine and cosine encoder. The system comprises two gain circuits, two AD conversion subsystems, a frequency quadrupling subsystem, a first product, a CORDIC algorithm subsystem, a precise code calculation subsystem, a speed calculation subsystem, a second product and two CRC checking subsystems. The two gain circuits receive Asin alpha ad Bcos alpha of which phase difference is 90 degrees. The output ends of the two gain circuits are connected with the two AD conversion subsystems and the frequency quadrupling subsystem. The first product and the CORDIC algorithm subsystem are connected with the precise code calculation subsystem. The output signal of the frequency quadrupling subsystem and the output signal of the precise code calculation subsystem are overlapped and then are connected to a first CRC checking subsystem and the speed calculation subsystem through the second product. The speed calculation subsystem is connected with a second CRC checking subsystem. The output ends of the two CRC checking subsystems are taken as the two output ends of the whole system.

Description

technical field [0001] The invention relates to a signal processing system, in particular to a high-precision signal processing system of a sin-cosine encoder. Background technique [0002] An incremental sin-cos encoder is a precision sensor that measures angular displacement and angular velocity. Sine-cosine encoders are widely used in scientific and technological fields such as precision measurement and real-time control due to their high resolution, high precision, non-contact measurement, and reliable use. [0003] As the precision requirements of CNC systems and modern industrial control systems are getting higher and higher, encoders with higher resolution and precision are required. However, the improvement of hardware performance alone cannot meet the market's high-precision requirements for signals such as motor position and speed. Therefore, it is necessary to further electronically subdivide the sine and cosine signals output by the encoder to improve the accura...

Claims

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Application Information

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IPC IPC(8): H03M1/12H03M13/09G01D21/02
CPCH03M1/12H03M13/09G01D21/02
Inventor 文长明文可
Owner 中工科安科技有限公司