Stater electrical testing
By redneck power co, Section Wind Posted on Sun Aug 3rd, 2008 at 08:43:26 PM MST
testing

WE have a stater that we built the rotors and wire are all dont and put together but as i put a volt meter to it and spin it the most i can get is 5 volts. How are you supposed to test an AC stater im not sure i had the volt meter on the correct setting and also where is the ground? Do you need the rectifier before you can check your power levels? I just dont want to put it up and realize i have a problem, I want to do as much testing before making it permenent. Thanks yall for your time.

Stater electrical testing | 11 comments (11 topical, 0 editorial)

Re: Stater electrical testing (3.00 / 0) (#1) by electronbaby (roy<at>windsine.org) on Sun Aug 3rd, 2008 at 04:45:13 PM MST (User Info) http://www.windsine.org

to test the stator without the rectifier, place your volt meter on AC volts scale, and you should see an equal volt reading across all three legs of the output while maintaining the same RPM on the alternator. To test the stator with the rectifier, wire in the rectifier to all ac phases (usually three phase) and set your volt meter to DC volts. Measure across the output of the rectifier. you should see a slightly higher DC voltage than the AC on the input (1.4 times more, to put it simply). This however does not take into account rectifier losses. If you say you only have 5 volts between legs, at what RPM are you testing? When you short out the phases, is the alternator very hard to turn? Is this a dual rotor axial flux machine? Please provide more information. Have Fun!! RoyR KB2UHF

Re: Stater electrical testing (3.00 / 0) (#2) by redneck power co (ronsantangelo@yahoo.com) on Sun Aug 3rd, 2008 at 05:39:06 PM MST (User Info)

yes it is a dual rotor and when shorted out it is hard to turn. 5 volts is me spining as fast as i can by hand. Is each leg produce 5 volts and the 3 equal 15 volts (theoretically) or is it just 5 volts? [ Parent ]

Re: Stater electrical testing (3.00 / 0) (#3) by electronbaby (roy<at>windsine.org) on Sun Aug 3rd, 2008 at 06:28:28 PM MST (User Info) http://www.windsine.org

your 5 volts, will turn into roughly 7 volts after it is rectified. It appears that you either dont have strong enough magnets for the type of coils you decided to wind, OR, you did not wind with enough turns to meet your voltage requirements. What magnets did you use, and whats the air gap? Have Fun!! RoyR KB2UHF [ Parent ]

Re: Stater electrical testing (3.00 / 0) (#4) by Flux on Mon Aug 4th, 2008 at 01:15:38 AM MST (User Info)

Seems impossible to get any useful information from people seeking help. Even the speed is vague. I have no idea of as "fast as I can ", I think over the years I have developed the knack of cranking things up to just over 300 rpm. That is likely to be fairly high so with the voltage figures given this still could be suitable for a small alternator. You give no idea of size of intended blades so again no help possible without much more information. Flux [ Parent ]

Re: Stater electrical testing (3.00 / 0) (#10) by redneck power co (ronsantangelo@yahoo.com) on Mon Aug 4th, 2008 at 09:03:56 PM MST (User Info)

speed was about 200 rpm approx. Intended blades are 10'. Sorry im new at this and am not sure what needs to go into my questions. As i answered before im using plans that are off of this site. [ Parent ]

Re: Stater electrical testing (3.00 / 0) (#9) by redneck power co (ronsantangelo@yahoo.com) on Mon Aug 4th, 2008 at 09:00:52 PM MST (User Info)

The magnets are rated to pull 72 lbs  the wire is wrapped 36 times 2 in hand with #14 wire. the air gap is .07 inches. We are following the planes that are on this site. [ Parent ]

Re: Stater electrical testing (3.00 / 0) (#11) by Flux on Tue Aug 5th, 2008 at 01:41:31 PM MST (User Info)

If it is the Otherpower 10 ft machine then you seem a little low. I am not sure how you are connected. If that 5v is from the coils of one phase then when you star connect it it will give 5 x 1.7v. Then when you rectify it will give that x 1.4v This will give you 11.9v so with the rectifier drop your cut in is a bit over 200rpm. A bit on the high side but it will work. If you only have 5v ac with the star connection then you are really low. The magnet pull is meaningless, just forget it or tell us the neo grade. The air gap is not .07" it will be the distance between magnets ( 2 x .07 plus stator thickness). If your stator has got much too thick due to bad winding or potting this will reduce volts. The meter will be near enough at 200 rpm. The discussion about waveform and inverters is valid for what they are discussing but your waveform will not be far removed from a sine wave unless you have done something wrong. Have you brought out 6 leads or have you done the star connection inside, I just don't know what you are measuring for sure. Flux [ Parent ]

Re: Stater electrical testing (3.00 / 0) (#5) by wooferhound (tim((NoSpamAt))wooferhound.com) on Mon Aug 4th, 2008 at 04:11:33 AM MST (User Info) http://wooferhound.com

If you are measuring AC voltage that is not a clean Sine wave in the 50/60hz range, then your meter may be giving you some inaccurate results. Low priced Digital multimeters are designed to measure AC from clean grid sources. W o o f -={(

Re: Stater electrical testing (3.00 / 0) (#6) by Jason Wilkinson (jason_wl48@hotmail.com) on Mon Aug 4th, 2008 at 09:07:59 AM MST (User Info)

I always wondered why? wooferhound, my vector inverter shows only 95v ac while the grid 110  yet the inverter run all lights bright, power drill and saw works fine yet only 95v ac.  Jason [ Parent ]

Re: Stater electrical testing (3.00 / 0) (#7) by wooferhound (tim((NoSpamAt))wooferhound.com) on Mon Aug 4th, 2008 at 01:07:52 PM MST (User Info) http://wooferhound.com

The frequency is correct to measure when it's coming from an inverter. But, the difference is that the inverter is putting out Square Waves, and the grid is giving you Sine Waves, that is what is giving you the difference in your AC voltage readings. W o o f -={( [ Parent ]

Re: Stater electrical testing (3.00 / 0) (#8) by Jason Wilkinson (jason_wl48@hotmail.com) on Mon Aug 4th, 2008 at 02:56:49 PM MST (User Info)

Thanks for that  woofer [ Parent ]

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