Three methods for resolution selection of incremental encoders

Source: network reprint

From the incremental encoder industry, according to the interim report of several domestic incremental encoder announced market, industry sales in the first half of 2013 did not have too much highlights, but along with the increase of intelligence and energy saving construction investment, incremental encoder industry still contains a large market opportunity, enterprises should continue to develop related industries market.

Three methods for resolution selection of incremental encoders:

1, single cycle pulse number to select control for the desired accuracy, it can reduce the zoom ratio, such as 12m measurement range, measurement showed only 1m/ step (low resolution), you can choose 12ppr, if you need to display 0.01m/ (high resolution) should choose 1200ppr or above the encoder. If you choose the 600ppr encoder to measure the accuracy of the 0.01m/ step, you'll need to do scaling and reduce the 0.02m/ steps to 0.01m/ steps.

2, the choice of single cycle pulse number PPR and the maximum speed motor drive incremental encoder considering frequency calculation, ensure that it does not cause the pulse output frequency exceeds the input pulse frequency and output frequency controller encoder at the maximum speed.

3, note that the controller may be used with 2 times or 4 times frequency function, according to the above examples, 0.01m/ steps of measurement accuracy, select 600ppr, and 2 octave or 300ppr for 4 octave, can achieve the same effect.

The characteristics of the incremental encoder has the advantages of small size, light weight, compact structure, convenient installation, simple maintenance, small driving torque, high precision, large measurement range, fast response characteristics, digital output, very suitable for measuring speed, infinite cumulative measurement. But there are zero error, less interference receiving equipment downtime for power and memory, boot should change or reference and other issues, these problems such as the selection of the absolute encoder can be solved.