Hi,

Please find enclosed my first test results with a simplified Keppe V3.0 motor.

The simplifications are as follows:

* Use of reed switches instead of opto coupler circuits.

* One pulse per cycle instead of 2.

My motor has already run with two pulses per cycle but I have some tuning problems in that case.

Input voltage for motor circuit: 10,8 V

Output

* The motor drove a 4 blade diameter 20 cm ventilator at 914 rpm (65,6 msec/cycle).

* Amplitude of AC voltage: +/- 10.6 V

* Calculated average value of +/- 7 V (rms value of 4,79 as on the picture seems incorrect)

* Current (motor circuit): between 40 and 60 mA (see picture + extra check with analog Amp meter).

Absorbed power by motor main circuit: P = U x I = 7 V x 60 mA = 0.42 W (conservative guess)

* Measuring method: amps are visualised on the oscilloscope by measuring the voltage drop over a 0,15 Ohm power resistor. A probe correction was set so that the displayed mV readings correspond to mA values.

* As I have serious doubts about the accuracy of my Amp meter and the rms readings the oscilloscope provides, the calculated power values should be considered as “order of magnitude” only.

* During another run, the motor was able to lift a 31 gr load over 75 cm in some 1,9 seconds. The average power then is 0.031 x 9.81 x 0.75 / 1,9 = 0.12 W.

* The absorbed power was estimated at 0.62 W for the main circuit so the efficiency then was 0.16 / 0.62 = 19.3 %

* A quick measurement of the secondary circuit showed that it consumes some 35 mA @ 10,5 V = 0.37 W. If you add that to the 0.62 W of the main circuit you get a total of 0.99 W. In that case, the overall efficiency drops to 0.12 / 0.99 = 12.1 %.

Attachments: oscilloscope pictures (sorry for the quality, I have no screen capture tools on that oscilloscope):

Please find enclosed my first test results with a simplified Keppe V3.0 motor.

The simplifications are as follows:

* Use of reed switches instead of opto coupler circuits.

* One pulse per cycle instead of 2.

My motor has already run with two pulses per cycle but I have some tuning problems in that case.

__Results (see also pictures below):__Input voltage for motor circuit: 10,8 V

Output

* The motor drove a 4 blade diameter 20 cm ventilator at 914 rpm (65,6 msec/cycle).

* Amplitude of AC voltage: +/- 10.6 V

* Calculated average value of +/- 7 V (rms value of 4,79 as on the picture seems incorrect)

* Current (motor circuit): between 40 and 60 mA (see picture + extra check with analog Amp meter).

__Calculated results:__Absorbed power by motor main circuit: P = U x I = 7 V x 60 mA = 0.42 W (conservative guess)

__Comments:__* Measuring method: amps are visualised on the oscilloscope by measuring the voltage drop over a 0,15 Ohm power resistor. A probe correction was set so that the displayed mV readings correspond to mA values.

* As I have serious doubts about the accuracy of my Amp meter and the rms readings the oscilloscope provides, the calculated power values should be considered as “order of magnitude” only.

__Motor efficiency = ?__* During another run, the motor was able to lift a 31 gr load over 75 cm in some 1,9 seconds. The average power then is 0.031 x 9.81 x 0.75 / 1,9 = 0.12 W.

* The absorbed power was estimated at 0.62 W for the main circuit so the efficiency then was 0.16 / 0.62 = 19.3 %

* A quick measurement of the secondary circuit showed that it consumes some 35 mA @ 10,5 V = 0.37 W. If you add that to the 0.62 W of the main circuit you get a total of 0.99 W. In that case, the overall efficiency drops to 0.12 / 0.99 = 12.1 %.

Attachments: oscilloscope pictures (sorry for the quality, I have no screen capture tools on that oscilloscope):

**Current (CH2) and voltage (CH1)****Current only (CH2)**