PRO 2 RACER -- This is not a dyno...
I know what he is trying to do but in reality thast does not tell much about the motor unless you ubderstand what is going on.
He is reading the back EMF that the motor generates and that is a VERY good tool to tell motor performance, but not the way he is doing it.
I will refer you to this thread and post. Follow what we were doing and recommending in there and you might get a better undferstanding.
This is the post where it starts, just read from that point on.
This is wher I started the posting, but read the entire thread, it is very educational.
CE Dyno Question
The reasons why his motors always have a higher voltage in one direction v another is because of the motor timing, NOTHING ELSE. And there is NO NEED to run a motor in reverse to read the back EMF that it generates.
If after you read the CE DYNO thread you havve more questions, feel free to ask for help.
BTW, in that so called dyno examplre he is refering to power, yet I do not see a single POWER calculation, just back EMF readings.
In the thread that I refered you to, John Stranahan did an experiment using a known rotational source. This is a much more accurate way to test a motor.
If you follow the example I set out, and use the formulas I give, you should get a good understanding of motor performance. Like I said, I explained the problem and John took it a step forward by doing the test.
His only error in the experiment was that he did not introduce an efficiency factor. However, as a comparisn tool, it is VERY ACCURATE. Much more than the dyno that you are looking at. (I would not call that a dyno, nor the experiment I outlined).
I hope this will help you.