| Author |
 Topic  |
|
kivdenn
Nobel Prize Winner
Uganda
535 Posts |
 Posted - Mar 03 2010 : 10:04:46 AM
|
Good day to you all. I am thinking of making a wind generator by using a wind driven dynamo or motor that produces electricity in return. I have managed to get a 3 phase 400 watt 230VAC motor but its speed is 2800rpm. I know wind generators use low speed motors. Is it possible to rewind this motor to single phase 400watts at 500rpm? The man who sold me the motor said it can only be reduced to a minimum of 900Rpm, can this speed work for me? If it is too high for wind power generation, cant the motor give out up to something like 30V since it is a 230VAC motor? I will be happy for any considerations to my questions.
Dennis |
|
|
kivdenn
Nobel Prize Winner
Uganda
535 Posts |
Posted - Mar 04 2010 : 10:16:57 AM
|
Any ideas on this guys ? Please help me.
Dennis |
 |
|
|
Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Mar 06 2010 : 11:00:15 AM
|
| I would assume that any electric motor shop can rewind your motor for whatever phasing you desire. However a bigger problem is that the frequency of the AC output is going to depend on the speed the motor is turning, which will not be constant. You can use gearing to step up and down the speed range of the motor, but you will probably have to rectify the output and run it through an inverter. In that case it may be worthwhile to get a large DC motor and use it instead. |
|
|
|
kivdenn
Nobel Prize Winner
Uganda
535 Posts |
Posted - Mar 08 2010 : 07:16:09 AM
|
| Thanks |
|
|
|
kivdenn
Nobel Prize Winner
Uganda
535 Posts |
Posted - Mar 09 2010 : 01:59:39 AM
|
| I have tried to use a three phase AC motor but but it doesn't work. I tested this when i connected the motor armature to a drill and I turned it on to its maximum but there was no out put as the multimeter was reading zero. Are there special motors for this application? |
|
|
|
Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Mar 10 2010 : 1:32:00 PM
|
| If it's an induction motor, I think you need to excite it first. Try a nine volt battery applied to one of the windings. |
|
|
|
kivdenn
Nobel Prize Winner
Uganda
535 Posts |
Posted - Mar 12 2010 : 11:16:48 AM
|
| Good day to you, my motor has three wires, one wire connects to one terminal of the capacity, another connects to both the other capacitor terminal and the live terminal while a third one connects to the neutral line. Where of these three terminals do I connect the 9V battery to excite the windings as you said. Please see the motor picture i drew. For more information. |
|
|
|
kivdenn
Nobel Prize Winner
Uganda
535 Posts |
Posted - Mar 12 2010 : 11:19:43 AM
|
Good day to you, my motor has three wires, one wire connects to one terminal of the capacity, another connects to both the other capacitor terminal and the live terminal while a third one connects to the neutral line. Where of these three terminals do I connect the 9V battery to excite the windings as you said. Please see the motor picture i drew. For more information.
Download Attachment:  lastscan.jpg
73.86 KB
 |
|
|
|
kivdenn
Nobel Prize Winner
Uganda
535 Posts |
Posted - Mar 17 2010 : 10:43:27 AM
|
Is it possible to reduce the RPM of a DC motor by increasing its number of armature windings? Thanks
Dennis |
|
|
|
wasssup1990
Nobel Prize Winner
A Land Down Under
2261 Posts |
Posted - Mar 18 2010 : 12:59:55 AM
|
Increase the windings? I think so. You'll make it more heavy and you'll have more friction, producing a new lower speed. You'll also increase the resistance and heat. The momentum of the armature will be increased. I think it depends on the motor being used. You may wrap more windings on and actually get more speed, then if you keep on winding more turns the speed will start to drop off and won't go any higher for every other wind you make.
If you take windings off you'll produce less magnetically induced force to keep the armature spinning. So the driving force minus the frictional forces will definitely make your motor reach a new lower RPM speed, and also produce less torque. Momentum will also be reduced since the armature weighs less.
All assuming you keep the same power supply voltage.
I think there are a lot of variables and there is no correlation between the number of turns and the speed of a motor. |
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion. |
Edited by - wasssup1990 on Mar 18 2010 01:07:28 AM |
|
|
|
kivdenn
Nobel Prize Winner
Uganda
535 Posts |
Posted - Apr 10 2010 : 07:21:17 AM
|
| How do I make a simple low RPM dynamo / motor |
|
|
|
pebe
Nobel Prize Winner
United Kingdom
1078 Posts |
|
|
kivdenn
Nobel Prize Winner
Uganda
535 Posts |
Posted - Apr 30 2010 : 3:59:20 PM
|
I have managed to make a wind generator but the problem is that its out put voltage flactuates with flactuating wind speeds. Some times at very low wind speeds it is less that 12V and at very high speeds it goes beyond 40V and at this voltage my batteris get realy hot. I fear my batteries might die out soon due to over charging or due high cherging voltage or something like that and its for that reason i want to mantain the output voltage in the ranges of 15V and 17V without wasting the precous power generated by the wind generator. If any one has an idea or a circuit that can solve this please help me.
Dennis |
|
|
|
audioguru
Nobel Prize Winner
Canada
4218 Posts |
Posted - Apr 30 2010 : 5:46:29 PM
|
People on other forums have made high power wind generators with the AC motor from a washing machine.
On the internet there is an article about ussing a furnace fan AC motor to make a high power generator powered from a lawn mower engine. It needs to be "excited" with a battery but they say the residual magnetism of a motor that has been run on AC works fine. |
|
|
|
Aaron Cake
Administrator
Canada
6718 Posts |
Posted - May 01 2010 : 10:15:05 AM
|
| You need a DC-DC converter. PowerStream makes converters for this purpose. I don't know what is available to you, but around here they even sell such converters at places like Canadian Tire. |
|
|
|
pebe
Nobel Prize Winner
United Kingdom
1078 Posts |
Posted - May 01 2010 : 4:09:46 PM
|
Dennis,
Your posting is rather short on detail. What are you using for a generator. Is its output AC or DC? |
|
|
|
Topic |
|
Wind generator project
