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光电编码器通常利用细分两路正交的码盘精码信号达到高分辨力的目的,为使细分技术更加完善,对基于三角波和基于正余弦波的两种细分方法进行了专题研究。分别对理想信号中存在直流误差、幅值误差、基波相位误差、高次谐波误差几种典型误差情况进行了分析,比较两种基于不同波形细分方法的抗干扰能力。实验对精码信号介于正余弦波和三角波之间的编码器进行测试,对于同一台编码器,采用正余弦波细分时精度为36″,采用三角波细分时精度为42″。结果表明:基于正余弦波的细分方法抗干扰能力优于基于三角波的细分方法。对于高精度光电编码器研制和生产时,可利用正余弦波对精码信号进行细分或将实际信号校正至标准正余弦波再细分。
In order to improve the subdivision technology, the optoelectronic encoder usually uses the two-way orthogonal encoder code to achieve the purpose of high resolution. The two subdivision methods based on the triangular wave and the sine cosine wave are specially studied . Several typical errors such as DC error, amplitude error, fundamental phase error and higher harmonic error of the ideal signal are analyzed respectively. The anti-interference ability of two different waveform subdivision methods is compared. Experiments on the code between the sine signal sine wave and the triangle between the encoder test for the same encoder, using the sine wave subdivision accuracy of 36 “, the use of triangular wave subdivision accuracy of 42”. The results show that the anti-interference ability of subdivision based on sine and cosine waves is better than the subdivision based on triangular wave. For high-precision optical encoder development and production, you can use the sine wave subdivision of the fine-coded signal or the actual signal is corrected to the standard sine wave subdivision.