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How to measure rpm


13-08-2015, 02:02. Author: AlexGyver

How to measure rpm of a motor


  • Step 1

    Stick strip of tape length of about 10 mm to the spindle motor: wrap around the spindle 1 times and glue duct tape to itself.
    How to measure rpm

  • Step 2

    Do this as many times as needed
    How to measure rpm

  • Step 3

    Download and install Audacity, here is a link to sourceforge
    How to measure rpm

  • Step 4

    Plug a mic, press REC
    How to measure rpm

  • Step 5

    Connect the motor to a source of electricity
    How to measure rpm

  • Step 6

    Start the engine, bring a small distance to the microphone and a little trample rotating tape by finger to make a loud buzzing sound
    How to measure rpm

  • Step 7

    Press stop
    How to measure rpm

  • Step 8

    Where the chart has big crests, click, hold down the Ctrl key and spin the mouse wheel to zoom the chart.
    The chart clearly visible oscillation periods. Yes, it is the individual elements of what we heard "z-z-z-z-z-z"

  • Step 9

    Highlight one period, focusing on any element. I chose a lower peak.
    Tick "Duration"

    How to measure rpm

  • Step 10

    Analysis. Duration - the time (in seconds) for which the engine makes one turn. To find the rpm, it is necessary to divide 60 on duration, in other words:
    How to measure rpm

    And yet I know that this motor with this power supply produces 6000 rpm =)

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