Selection and calculation method of encoder resolution

There are many kinds of encoder resolutions, ranging from a few hundred to tens of thousands. Regarding how to choose the encoder resolution, we should decide according to the actual needs. The following is a list of methods for selecting the encoder resolution. You can learn about it.

1. Try to choose the number of single-turn pulses as the required precision control, so as to reduce the zoom ratio. For example, if the measurement range is 12m, the measurement display only needs 1m/step (low resolution), you can choose 12ppr, if you need to display 0.01m/ Step (high resolution) should choose an encoder of 1200ppr or above. If you choose a 600ppr encoder to measure an accuracy of 0.01m/step, you need to perform a scale conversion, reducing 0.02m/step to 0.01m/step.

2. Comprehensively consider the selected single-turn pulse number ppr and the maximum speed of the motor-driven incremental encoder to calculate the working frequency to ensure that it will not cause the pulse output frequency to exceed the pulse output frequency of the encoder and the controller at the maximum speed The input frequency.

v 3. Note that the controller that may be used has a 2 times or 4 times frequency function. According to the above example, with a measurement accuracy of 0.01m/step, select 600ppr and perform 2 times or 300ppr for 4 times, and the same effect can be achieved .

Incremental encoders are characterized by small size, light weight, compact structure, easy installation, simple maintenance, small driving torque, high precision, large range measurement, fast response, digital output characteristics, very suitable for measuring speed, unlimited Cumulative measurement. However, there are problems such as zero cumulative error, poor anti-interference, power-off memory when receiving equipment, and change or reference position when starting up. These problems can be solved by using an absolute encoder.