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Entrance cone of the wind tunnel:
Even the belt was not enough to curve the four parts in the right position!
The curve is simply parabolic function.
The entrance cone is kind of too short, but I needed place…
Inner side surface is not perfect.
...Continue Reading
Even the belt was not enough to curve the four parts in the right position!
The curve is simply parabolic function.
The entrance cone is kind of too short, but I needed place…
Inner side surface is not perfect.
...Continue Reading
This homemade torque test bench gives very good results.
If the drive's resistance and no-load torque are known or well estimated, it allows to modelize a motor's performances with precision, based on amps, volts and rpm measurements.
Calculated values for power at the shaft are close to measured values, with an average error of 0,7% (max error = 3 %, but with the motor being run under bad conditions, with bad efficiency).
In fact, I think I can modelize a motor in a quite better way than only using amps, volts and rpm measurements (with kv thought as constant). BUT, it is very very close to any model taking into account inductance and to me it proves their reliability (thinking about drivecalc).
Well, I think...!
I'm not at all a scientist...
If the drive's resistance and no-load torque are known or well estimated, it allows to modelize a motor's performances with precision, based on amps, volts and rpm measurements.
Calculated values for power at the shaft are close to measured values, with an average error of 0,7% (max error = 3 %, but with the motor being run under bad conditions, with bad efficiency).
In fact, I think I can modelize a motor in a quite better way than only using amps, volts and rpm measurements (with kv thought as constant). BUT, it is very very close to any model taking into account inductance and to me it proves their reliability (thinking about drivecalc).
Well, I think...!
I'm not at all a scientist...
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Even if it's not obvious, it was built with good precision. Anyway it's calibrated... -
Views: 374
The best I've found was using rasor blades for the axe. -
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Motor is 51g - 1350 kv. See the temp sensor is inside the motor but in a well cooled area. -
Views: 387
Props I use... -
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Deduced KV for the EMP N2826 1350kv (51g). KV understood as KV = amps / torque. This seems to vary according to I/U. Any idea why? -
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The balance isn't fixed solidly, anyway anything mooving when the motor turns means the prop isn't well balanced.
