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Precision compensation system of sine-cosine output type encoder

A technology of sine and cosine encoder and precision compensation, which is applied to instruments, uses electromagnetic/magnetic devices to transmit sensing components and other directions, and can solve problems such as lag

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

[0010] Sine-cosine wave shaping involves converting the waveform into a tractable form on a purely hardware basis, but in the process the new waveform will lag behind the input waveform

Method used

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Embodiment Construction

[0057] Such as image 3 As shown, the devices used in this system include: interpolation period generation module, sine and cosine data sampling and calculation module, whole period calculation module, table lookup module, output mode selection module, pulse mode output module and absolute value output module. Its function and structure are exactly the same as those of the subdivision device introduced in the background art and will not be described here. The difference is that an error table storage module is newly added, which is used to store the error value of any point in a circle of the sine-cosine output encoder obtained by the above method; The compensation value after accumulating the subdivision value relative to the error value of the error table storage module is added to the result obtained by multiplying the number of sine and cosine signals of the entire cycle of the encoder input by the whole cycle counting module by the current subdivision multiple . In addi...

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Abstract

The invention discloses a precision compensation system of a sine-cosine output type encoder, which is characterized in that on the basis of the subdivision technology of the sine-cosine output type encoder, the error is compensated in the subdivision process of improving the resolution of the sine-cosine output type encoder, thereby improving the precision of the feedback value of the encoder. By combining a precision compensation method of the sine-cosine output type encoder with a precision compensator of the sine-cosine encoder, which comprises a compensation period generating module, a sine-cosine data sampling and computing module, a full period computing module, a look-up module, an output mode selecting module, a pulse mode output module, an absolute value output module, an error table storing module and a summing module, the system has simple implementation, good using effect and excellent adaptability and is suitable for being widely popularized in all fields of position measurement, angle measurement and motion control using sine-cosine signal output, such as numerical control machine tools, high-precision measuring instruments and the like.

Description

technical field [0001] The invention relates to an encoder precision compensation system, in particular to a sine-cosine output type encoder accuracy compensation system. Background technique [0002] In recent years, the emerging product, the encoder with sine and cosine output, has been widely used in the field of numerical control because of its high precision, simple and fast follow-up processing, and intuitive and easy-to-use numerical values. The encoder with sine and cosine output is a high-resolution, high-precision, low-cost balanced product , has many advantages: [0003] 1. The output waveform contains relative phase information, so the resolution can be greatly improved by using a specific interpolation method without the need to increase the physical reticle. [0004] 2. The output spectrum of the encoder with sine and cosine output is relatively pure, and the spectrum specific components are less, so it is more suitable for long-distance transmission than squa...

Claims

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Application Information

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IPC IPC(8): G01D5/12G01D18/00
Inventor 于德海张赞秋隋继平何兴家陈虎
Owner KEDE NUMERICAL CONTROL CO LTD
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