It does not need a lot of mind, all in the classics.

Magnetically soft material gives higher efficiency.

The magnet on the back of the core removes sticking.

According to Beddini, mechanical energy gives 20% efficiency. Here it can be used.


Ask, I always answer that I know. Sometimes I can be wrong. 

thanks. I'm testing and report

Hi skywatcher. I build the african mechanical generator version with 10 coils. the rotor speed is very very high RPM. the input is 12 volt 7.5 amp battery and the output is 27 volt but the charging performance is not very good. can you help me to solving the performance ? do you think any problem with the circuit ? the developer in document said: its generating 600 to 900 volt but its only generating 27 volt !  pictures of the circuit and mechanical unit is below.
thanks.

Hi erfandl,
I assume the 600 to 900 volt HV spikes amplitude the developer said was under an unloaded condition and also very likely meant peak values.   Now your 27 volt was measured by a DMM or an oscilloscope and did you mean an average or peak value? Also, the 27 volt was a loaded or unloaded measurement ? (regardless of what instrument you used)

... you mean I'm replacing the iron bolt of coils with ferrite rods ? whats different between the iron bolt and the ferrite ?
...

As an addition to doktorsvet's answer,  the difference between them is that ferrite material has much much less eddy current loss than bolts. In changing magnetic field circuits you should avoid using electrically conducting core materials for the coils.
Your 27 volt 'output' may or may not be explained by the lossy bolts, when you replace the bolts with ferrite rods or ferrite material, you will see.  There maybe other issues of course but the bolt is one of them.

Gyula

Hi erfandl,

From your description it comes that the charging battery cannot feed your inverter + the 3W LED because the charge it receives from the circuit cannot make up for the discharging process the inverter + the LED represents.
Whether this is a problem in your circuit or not, this cannot be said for sure, there is certainly one thing you can improve in the circuit: replace the bolt cores of the coils with ferrite or laminated cores, to minimize eddy current losses.
But this may still not solve this problem, unfortunately.

I would suggest the followings: if you have not done so, check with a DMM the AC output voltages of the individual 'blue' coils one by one to see if there are more than 10-15 % difference between them. Also, check the total AC across all the 6 coils whether they add up to the sum of the individual AC voltages, this is a check also for the correct series connection of the coils.  If there is a big difference, then try to check two or three coils only at a time whether they add up correctly.
You may wish to check the induced AC output voltages of the blue coils also when you disconnect the gate drive to the 2nd IRF840 to stop it switching. Does this disconnection changes the motor RPM?

Gyula

Hi erfandl,

From your description it comes that the charging battery cannot feed your inverter + the 3W LED because the charge it receives from the circuit cannot make up for the discharging process the inverter + the LED represents.
Whether this is a problem in your circuit or not, this cannot be said for sure, there is certainly one thing you can improve in the circuit: replace the bolt cores of the coils with ferrite or laminated cores, to minimize eddy current losses.
But this may still not solve this problem, unfortunately.

I would suggest the followings: if you have not done so, check with a DMM the AC output voltages of the individual 'blue' coils one by one to see if there are more than 10-15 % difference between them. Also, check the total AC across all the 6 coils whether they add up to the sum of the individual AC voltages, this is a check also for the correct series connection of the coils.  If there is a big difference, then try to check two or three coils only at a time whether they add up correctly.
You may wish to check the induced AC output voltages of the blue coils also when you disconnect the gate drive to the 2nd IRF840 to stop it switching. Does this disconnection changes the motor RPM?

Gyula

thanks for reply. OK I'm measuring the blue coils with DMM and AC mode it's showing 33 volt AC for each coils ! I disconnect the coil number 8 but the motor continuous running without any changes the motor rpm

Well, then just check AC voltage across any 2 blue coils in series like say coils 6 and 8 or say across coils nr 10 and nr 2: if they show less than say 55-60 volts then it is not good to connect them in series because their phase angle differ and start working against each other.  If you find say 10-15 volts only across two blue coils, then try to flip the wires of one of the coils to see if you get the sum of the two, and so on.

Instead, try to use individual full wave diode bridges across each blue coil to collect their 33 V into individual puffer capacitors while they remain in series connection.  It is possible that when you try to load the DC outputs of the individual puffer capacitors the RPM of the motor will be reduced (normal Lenz).

Question: when you disconnect the coil nr 8, how the induced 33 volt changes across the individual blue coils? Does it change?

Gyula

thanks. the AC voltage between the 6 and 8 coil is 1.2 volt I'm re wiring the motor and connecting the coil 1 and 4 to the plus of the circuit the RMP is now higher. but the AC output voltage is now 24 volt.
here is my coil. all 10 coil are winding Clockwise.
also the motor will not starting automatically. I must handle the motor with hand. also the motor rotating to both sides

Well, you are free to make any coil combinations so that the induced voltages should sum up.
As per common logic if all the coils are positioned with the same identical winding sense,
then their induced voltages should sum up. 
The 1.2 volt resulting between coils 6 and 8 may indicate one of them should be flipped by its wires.
I assume you have 5 rotor magnets, right? 
Gyula

thanks. the motor will not starting automatically. I must handle the motor with hand. also the motor rotating to both sides !
yeah the rotor have 5 magnets. all N side is out. the hall sensors are installed in coil 1 and coil 4

 erfandl,
If not difficult, draw a diagram of the connection of the coils.

I myself did not read how it was done in Africa, but you can start the reverse EMF in a circle...
For this you need to leave 5 magnets, and put the coils 6.