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在机床自动计测转数时,有时往往还要判别其旋转的方向(例如当正转时计数器加数,逆转时计数器减数).这可以用光电取样可逆判向器来实现.但用一般光电判向器判别不是容易失误,就是电路结构较为复杂.这里向大家介绍一种光电取样可逆判向电路,它只用二只光电管取样,线路也很简单.在转速为10000转/分以下的任何速度时能可靠地进行判别和计数,即从正转到逆转或从逆转到正转,不会丢失一个脉冲.即使光孔在光电管附近来回晃动,也不会造成误判,该判向器原理方框图示于图1.二只光电管在光栏
When the machine automatically measures the number of revolutions, it sometimes also determines the direction of rotation (for example, when the number of revolutions is positive, counter decreases when reversing), this can be achieved by using a photoelectric reversible resolver. Photoelectric discriminator is not easy to determine the error is that the circuit structure is more complicated here to introduce a reversible reversible photoelectric sampling circuit, which only two phototube sampling, the line is also very simple at a speed of 10,000 rev / min Of any speed can reliably determine and count, that is, from forward to reverse or from reverse to forward, will not lose a pulse.If the light hole back and forth in the vicinity of the photocell sway, it will not cause miscarriage of justice, the sentence The principle of the block diagram is shown in Figure 1. Two photoelectric tubes in the light bar