Quote:
Originally Posted by nuz69
Patrick, this isn't exactly right, there is a small amount of power which is lost in the bearings and in the air friction no ? 
The motor is not really at "no load" but "air loaded".
Maybe it's only 0,5 or 1% of the no load power... What's your opinion about aerodynamics and bearings losses ?
(I doubt that a lot power is lost in the bearings anyway, other than that they would be quickly ripped apart...) |
Yes, that's true -- bearing losses and "windage" (air drag) figure into the no-load losses. I just simplified it a bit because the majority of the losses are magnetic.
To determine what the bearing and windage losses are, you can measure no load current at, say, 6V and at 10V. The difference (usually very small) will be the contribution of bearing and windage losses.
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