Under many circumstances encoder not bad, but simply because of interference, resulting wave pattern is not good, resulting in the count are not allowed. Ask how to judge?
The encoder is a precision component, mainly because the encoder around interference more serious, such as: Are there large motors, welders frequent starting to cause interference, whether the same pipeline and power line transmission.
Choose what kind of output is also very important for immunity, interference with general reverse output signal is better, namely A + ~ A-, B + ~ B-, Z + ~ Z-, wherein power is supplied to eight lines, and not five lines (of zero). Reverse signal with a transmission in the cable is symmetric, by interference, in the receiving apparatus may be further increased Analyzing (e.g., use of a signal receiving apparatus A, B signal 90 ° phase difference, to read the level of 10, 11 when 01,00 four states, is counted as a valid pulse, this scheme can effectively improve anti-jamming performance (count accurately)).
The encoder is also good and bad, its code wheel \ electronic chip \ internal circuit \ big difference signal output, incremental encoder or else how would a 1000 line from 300 yuan to 3,000 yuan difference so much?
① exclusion (leaving the area, closed, isolated) interference source, ② The mechanical play is determined whether the accumulated error, the control system determines whether or ③ The encoder interface circuitry and mismatch (wrong selection encoder); ①②③ method attempts after failures the phenomenon of exclusion can be a preliminary judge, if not exclude the need for further analysis.
The simplest way to determine whether the encoder itself is the fault of exclusion. Now my company has an encoder mass production, the use of technology to produce mature, product failure rate control in a few thousandths. Specific methods of elimination are: replaced with a same type of encoder up, if the same fault phenomenon, can basically rule out an encoder failure, because the two encoders simultaneously faulty small probability events may be small, can seen as 0. If replacement of the same type encoder up, immediately rule out the failure phenomenon can be determined is the basic encoder failure.
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