windgen.org vawt discussion

Members Login
Username 
 
Password 
    Remember Me  
Home -> windgen.org discussion -> VAWTs -> Can a Buck converter improve turbine performance???
Post Info TOPIC: Can a Buck converter improve turbine performance???
GoVertical


Guru

Status: Offline
Posts: 1930
Date:
RE: Can a Buck converter improve turbine performance???
 

Maximum current output without using the circuit is 2 amps. The circuit is definitely is a benefit. 



__________________

Lets find renewable solutions to reduce energy cost

 
GoVertical


Guru

Status: Offline
Posts: 1930
Date:
RE: Can a Buck converter improve turbine performance???
 

Hi, I configured the PMA using just 2 stators to form a 3 phase star, 8 coils per phase. Phase to phase resistance = 9 ohms.

 

Rotor RPM        Voc DC

100                      15

200                      30

300                      45

400                      60

500                      75

 

Rotor RPM         Vin DC    Amps in        Amps out

100                      16.5             ?                0.2

200                      27.3          0.2                1.0  

300                      28.8     2.0                5.0         Vout = 12.8Vdc

 

Free wheeling diode temp = 82 degrees F

50% duty cycle

test fixture limit 300 RPM using load

Vout = 12 volt deep cell test load

measurements ball park , 60 Watts appears to be the limit of test fixture under load. 

 

I have to remove one stator and rotor and then I will be able to road test. Search for ideas on how to limit voltage to 100 volts at the input to protect circuit. Comments welcome

 



__________________

Lets find renewable solutions to reduce energy cost

 
GoVertical


Guru

Status: Offline
Posts: 1930
Date:
Can a Buck converter improve turbine performance???
 

Hi, video of test circuit operation.  

http://www.youtube.com/watch?v=RqBQzoq_ctc&feature=youtu.be 

 

video not posting

-- Edited by GoVertical on Sunday 13th of May 2012 10:29:06 PM



-- Edited by GoVertical on Sunday 13th of May 2012 10:30:12 PM



-- Edited by GoVertical on Sunday 13th of May 2012 10:31:19 PM



-- Edited by GoVertical on Sunday 13th of May 2012 10:34:16 PM



-- Edited by GoVertical on Sunday 13th of May 2012 10:35:51 PM



-- Edited by GoVertical on Monday 14th of May 2012 12:14:34 AM

__________________

Lets find renewable solutions to reduce energy cost

 
GoVertical


Guru

Status: Offline
Posts: 1930
Date:
RE: Can a Buck converter improve turbine performance???
 

Hi, ran the test again using a the larger air core. About 60 watts at the input and about 60 watts at the output.  Measurements are just ball park but the inductor was much cooler.  Having the right size inductor for the switching frequency makes a big difference. Larger wire, less resistance. I have to buy a inductor that is rated for 15 amps and adjust the switching frequency for the impedance of the inductor. 



Attachments
__________________

Lets find renewable solutions to reduce energy cost

 
GoVertical


Guru

Status: Offline
Posts: 1930
Date:
RE: Can a Buck converter improve turbine performance???
 

New test data;

 

rotor speed 500 RPM

Vin    40voltsDC

Iin      3amps

Vout   12voltsDC

Iout     6amps

Duty cycle 50%   

 

Stators 4 coils per phase

stator resistance < 1 ohm

 

Circuit temp 82 degrees Fahrenheit

 

Inductor temp 170 degrees Fahrenheit

I need a better inductor. 

 

 

At this time I believe F&P stator should be wired to 6 coils per phase.    



Attachments
__________________

Lets find renewable solutions to reduce energy cost

 
GoVertical


Guru

Status: Offline
Posts: 1930
Date:
RE: Can a Buck converter improve turbine performance???
 

Hi, analog amp meters are working. It is nice to how much the  duty cycle affects the current at the output. Input cap is only rated at 125 volts, 12 coils per phase is producing a very high voltage at the input. The cheap-o meter is unable to read the voltage at the input at higher RPMs.  I was able to read 2.5 amps at input and 5 amps at output.  I am changing the PMA stator connection to 4 coils per phase. Will post results when available.        



__________________

Lets find renewable solutions to reduce energy cost

 
GoVertical


Guru

Status: Offline
Posts: 1930
Date:
RE: Can a Buck converter improve turbine performance???
 

Hi, meters are mounted. I have never seen a shunt before. The mounting nuts are very small. They included everything except a wiring diagram. Thank goodness for google search. 



Attachments
__________________

Lets find renewable solutions to reduce energy cost

 
GoVertical


Guru

Status: Offline
Posts: 1930
Date:
RE: Can a Buck converter improve turbine performance???
 

 

stator winder video



__________________

Lets find renewable solutions to reduce energy cost

 
GoVertical


Guru

Status: Offline
Posts: 1930
Date:
RE: Can a Buck converter improve turbine performance???
 

 

I was able to remove the stator shaft . The winding resistance is 149 ohms , 135 ohms. The center hole will have to be drill out to accommodate a 5/8 shaft, a jig will have to be fabricated to keep the hole centered. The wire is very small, it will be interesting to see what kind of open circuit voltage will be generated. The small size and light weight is very appealing. Ceiling fan cost $20.00 US.  



Attachments
__________________

Lets find renewable solutions to reduce energy cost

 
GoVertical


Guru

Status: Offline
Posts: 1930
Date:
RE: Can a Buck converter improve turbine performance???
 

 Hi, purchased ceiling fan and removed stator. I am down sizing the PMA until I have a better understanding of the Buck circuit limits. The F&P is just to big to test with, it scares me.

The new parts have arrived. The analog amp meters included a shunt resistor. I have to fabricate the rotor for the CF stator. I am using 7/8x1 7/8x3/8 ceramic blocks for the rotor and will include a metal band on the outside of the magnets, the same method used on the F&P stock rotor. The CF stator has two single phase windings. I will post results when available.



Attachments
__________________

Lets find renewable solutions to reduce energy cost

 
1 2 3 … 26  >  Last»  | Page of 26  sorted by
 
Quick Reply

Please log in to post quick replies.
Home -> windgen.org discussion -> VAWTs -> Can a Buck converter improve turbine performance???
Post to Facebook Tweet this page Post to Digg Post to Del.icio.us