High speed sine and cosine subdividing device

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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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 technical difficulty, it is only mastered by a few large companies in the world. In particular, the price of high-precision encoders is surprisingly high. Often some manufacturers have already applied their low-precision products, and when the accuracy of the encoder needs to be further improved It is necessary to spend a high price to buy its high-precision products to replace existing products, which not only increases the burden on the enterprise, but also brings waste. Therefore, a device that can change the accuracy of the original products needs to be developed to solve the above problems. question

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