ghydda
Joined: 02 Oct 2008
Posts: 24
Helped: 4
Location: Denmark
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 05 Oct 2008 19:48 relation betwee motor speed and current drawn.. |
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Hi,
You're mistaken in assuming the maximum current draw will happen at maximum speed. It is in fact vice versa. At zero rpm the motor will be able to draw the largest current, this usually happens when the motor is accelerated from stand-still.
When the motor is running at maximum speed with no mechanical load on the motor shaft the motor will use very little energy as it only has to provide the mechanical energy for overcoming the friction in the bearings and against the air.
The two operating conditions I have mentioned above are two opposite extreme cases.
The current draw at any given time is heavily dependent on the mechanical energy being drained from the motor shaft.
So you will not be able to make a correlation between power input and rpm.
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