rpm measurement
Difficulty: ★☆☆☆☆
Time: Less than 10 minutes
From scrap: ░░░░░░░░░░ 0%
PreambleOne day before my next project I dumped on the table all of my motors and realized that I can not "approximately" choose from the fastest of them. After thinking for a few minutes, I found a great way to do this without the use of any special tools.
Materials- Motor
- Duct tape
Tools- Computer
- Microphone
- Scissors
- 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.
- Step 2
Do this as many times as needed
- Step 4
Plug a mic, press REC
- Step 5
Connect the motor to a source of electricity
- 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
- Step 7
Press stop
- 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"
- 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:
And yet I know that this motor with this power supply produces 6000 rpm =)
How to measure rpm of a motor
Results and tips- I believe that this method is accurate enough
- If the engine itself is noisy, it may complicate the task
