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光栅编码器装调的偏心误差和使用中安装转轴的振动严重影响光栅编码器的测量精度,限制了光栅码盘的应用范围。为了消除光栅编码器偏心与振动对测量的影响,在双读头法的基础上,提出了四读头法消除光栅编码器偏心和振动影响的方法,并进行了理论推导和仿真。结果表明,采用沿光栅编码器圆周均匀分布的四读头读取叠栅条纹信号,并将检测相位相加除以4的方法比当前普遍采用的对径读头读数相加除以2的方法更能有效地提高光栅编码器的测量精度,从而降低了光栅编码器的装调要求。利用四读头各自采集的测量信号可以解算出偏心方向和偏心量,从而可以消除安装转轴振动的影响。对光栅编码器的进一步应用研究具有指导意义。
The eccentricity error of the raster encoder and the vibration of the spindle installed in use seriously affect the measuring accuracy of the raster encoder, which limits the application range of the raster encoder. In order to eliminate the influence of raster encoder eccentricity and vibration on the measurement, a four-read head method based on the double read head method is proposed to eliminate the influence of the eccentricity and vibration of the raster encoder. The theoretical derivation and simulation are carried out. The results show that the method of reading the moire signal with a four-read head evenly distributed along the circumference of the grating encoder and adding the detection phases by 4 is more effective than the commonly used reading of the read-head by 2 Which can effectively improve the measuring accuracy of the grating encoder, thereby reducing the requirement for the assembly and adjustment of the grating encoder. The use of four reading heads each collected measurement signal can be calculated out of the eccentric direction and eccentricity, which can eliminate the impact of the installation shaft vibration. The further application of grating encoder is instructive.