Best method for Stepper Motor Current Sensing?
Hello Everyone :wave:,
I am a Hobby CNC Builder. One thing I have noticed about most DIY Stepper drivers is that almost all of them uses a Low value High power Resistor based current sensing. But i have noticed that going above say 5A makes this method troublesome as the power rating for the resistors need to be higher and also the smaller sense voltages are really prone to Noise interferences which messes up with the current sensing.
I have seen some people using an Op-Amp to get a higher level voltage which is comparatively less prone to noise. Is this the best method to sense the coil current :confused:
I believe there are plenty of Hall Effect Current sensor ICs like the ACS712 in the market which are not out of reach for most DIYers. I was wondering if someone can share ideas/benifits/issues related to using such ICs instead of the Resistor method.
Is it better to go the Hall Effect way? if so which IC is the best to use? or are there better more efficient less error-prone ways to sense the coil current?
Please Advice!
Thank You,
Joe!
Do you examine in uni-Paula or which which is bipolar?
Because English cannot understand it, I use an interpreter.
I cannot express it definitely.
I divide the FET element of the motor driver IC, and there is the thing which assumed that I am only for the current detection.
There is the high side electric current detecting element IC of the motor driver.
In addition, there is a reluctance detection (a hall element type) electric current detector.
However, these have a problem in noise characteristics-resistant, rapidity.
I post it in a range to forgive of the electricity, and, as for the best method, the voltage should do below low resistance 1V.
The unnecessary signal is removed by processing of the IC inside.
However, Motoko more than 3A is not caught in the true problem in the exclusive IC inside.
（I cannot install two in parallel）It is necessary to make the system so that you drive a motor more than 3A.
I learn it about my the system.
I will discuss it with me if interested in you.
Give me an answer if I agree to see postscript next.
http://www.cnczone.com/forums/showth...225#post602225
