Stepper motor current – seems 'backwards'

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  • #1853
    BrianV
    Keymaster

    From John:
    “It looks like your your blueprints here for your stepper motors might be backwards: it looks like you’re 205 takes more current the 305. It seems kind of weird.

    #1854
    BrianV
    Keymaster

    John,
    Your observation is correct. However, current is only one part of the equation. Work is measured in power. And Power is current2 times resistance (I squared R).

    • 305: 2 Amps @ 3 Ohms = 12 Watts
    • 205: 3 Amps @ .92 Ohms = 8.28 Watts
    • 130: 2.1 Amps @ 1.23 Ohms = 5.4 Watts

    So, although current is important (very important since it is squared in this case), it is only part of the power equation.

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