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3-phase vs. single-phase alternator
|
23
comments (23 topical, editorial)
Re: 3-phase vs. single-phase alternator
(
3.00 / 0
) (
#12
)
by eliyahu (
eliyahu@godspot.org
) on Fri Dec 7th, 2007 at 12:06:58 AM MST
(
User Info
)
I ran into a chap who re-wired a 3 phase induction motor into a generator that according to him worked fabulously. The motor he rewound was a 5 hp 1170 rpm 72 slot 220/440 volt.
As to what to do with the connection between b and c phase. From my understanding that is where you can put a resistance load and a capacitor. The phase sequence connection is important and needs to be determined so that a and b can be transformed and b anc c be connected with resistance and a capacitor to help keep her in balance.
Does anyone have experience with re-wiring induction motors versus starting from scratch?
I have a 575 volt 3 phase 7.5 motor and was wondering if I could add poles to decrease the speed. She is 6 pole now and if I increased the poles to 18 then she would be producing at a much lower r.p.m. starting from 1165 (with slip)I suspect that I would start producing at about 450 rpm. Would this translate to too high a cut in? I would rewire the stator. Then transform down to 240v then rectify and invert to grid or rectify and choke for 24 or 48 volt for batteries.
For sake of specifics I have a 7.5 h.p. 6 pole 5.6 kw 60 hz 3 phase synchronous speed 1200 rpm. It has 48 slots in the stator. If I wired for 16 groups per phase using #18 wire how many turns would I need per phase group?
For the rotor how many magnets would I need? 3x6?
Any advice would be most appreciated. Great site. I remember seeing an article in a private power magasine that talked about required ratios. Anyone know of some good reference material? Thanks
[
Parent
]
Re: 3-phase vs. single-phase alternator
(
3.00 / 0
) (
#14
)
by eliyahu (
eliyahu@godspot.org
) on Fri Dec 14th, 2007 at 12:37:59 AM MST
(
User Info
)
I now see being new to this site that Zubbly would have been a great help. Can anyone refer me to some good reading material on this subject Cheers
[
Parent
]
3-phase vs. single-phase alternator
|
23
comments (23 topical, 0 editorial)
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