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  1. 26-12-2014 #12
    Jonathan's Avatar
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    Jonathan
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    Quote Originally Posted by CNCStudent View Post
    Jonathan is current not consistent. Input must equal total output? But measuring the input would be smoother than measuring just one of the channels
    The formula you need to recall is power=voltage*current. I said in the previous post that the output power fro the motor driver must be roughly equal to the input power. In reality there are losses in the driver, but if we assume they're small then we can equate the input and output power to get ..
    Now do you see why the input current, ., is lower than the output?

    Here's an example of the same concept with a different stepper driver - in this case a 2m542 driver with a 3Nm motor from CNC4you connected to a lab PSU:



    Current is on the left, voltage on the right.
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