High speed sine and cosine subdividing device

A sine-cosine, high-speed technology, applied in the field of encoder output signal processing system, can solve the problems of high-precision encoders such as high price, non-counting, waste, etc., and achieve the effect of improving encoder resolution, increasing cost, and facilitating calculation

Active Publication Date: 2010-06-09
KEDE NUMERICAL CONTROL CO LTD
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Problems solved by technology

[0004] 2. When a square wave output encoder needs a higher resolution, the number of physical engraved lines on the code disc must be increased, but when the number of engraved lines increases, the diameter of the code disc must be increased, and the difficulty of the manufacturing process is greatly increased.
[0006] 4. The transmission distance of the square wave output is relatively short, the optimum is about 30 meters, if it is too long, it is easy to cause miscounting and non-counting due to the lack of high-frequency parts in the square wave transmission
However, due to the high technica...

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  • High speed sine and cosine subdividing device

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Embodiment Construction

[0035] Such as figure 1 and figure 2 As shown, the specific working process of the high-speed sine-cosine subdivision device is as follows: firstly, the differential compensation period generation module generates the calculation period pulse signal of the entire device, which is used to control the startup of the device and execute each command according to the specified clock cycle; then , the sine-cosine data sampling and calculation module is used to receive the two-way sine-cosine signals output by the encoder (the two-way sine-cosine signals are A, B-phase or C, D-phase signals), and the voltage values ​​of the two-way sine-cosine signals are first By performing 12-bit (or 14-bit) A / D conversion, the digital quantities corresponding to the voltage values ​​of the two sine and cosine signals can be obtained. The digital quantity is obtained by a 12-bit A / D converter, so the maximum achievable subdivision multiple is 2 to the 12th power, that is, 4096 times. Similarly, ...

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Abstract

The invention discloses a high speed sine and cosine subdividing device. Multiple interpolation subdivision is performed to a sine and cosine signal via a sine and cosine data sampling and calculating module, a whole period calculating module, a table look-up module, a summation module, an output mode selecting module, a pulse mode output module and an absolute value, in order to precisely output a low-precision sine and cosine via a coder. The device has high subdividing precision, can respond rapidly via a single chip system and can reach to a responding speed of foreign products having a same precision. Besides, due to simple structure, convenient manufacturing and low cost, the invention can be applied widely in all fields of position measuring, angle measuring and movement control by outputting with a sine and cosine signal, such as numerical control machine, high-precision measuring apparatus, and the like.

Description

technical field [0001] The invention relates to an encoder output signal processing system, in particular to a device capable of performing multiple interpolation and subdivision of sine and cosine signals. Background technique [0002] The encoder is the core functional part of the measurement system of the numerical control system. Its development has also changed from the original square wave increment to the sine and cosine increment to the absolute value output, and the resolution is getting higher and higher, and the accuracy is getting better and better. Square wave output encoders were used in early numerical control or measurement systems, but with the development of industry, the demand for accuracy of workpieces and surveying and mapping continues to increase, and the original encoders can no longer meet the requirements, mainly including the following problems: [0003] 1. The square wave output has no excessive phase, that is, there is no intermediate state when...

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Application Information

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IPC IPC(8): H03M1/64G01D5/244
Inventor 隋继平张赞秋于德海
Owner KEDE NUMERICAL CONTROL CO LTD
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