Posted: 11:23pm 28 Jan 2006

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I have a 120vdc motor for a wind mill at 2.5 KW and I need to find

a way to regulate it so it well charge my 12 vdc system anyone out

there with an idea how to do this Thanks in Advance John ONT

Posted: 06:26am 29 Jan 2006

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What voltage do you expect to get from your motor in generator mode?

Is it permanent magnet or does it have field coils?  Does it have brushes?

Posted: 11:33pm 29 Jan 2006

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Hi John.

Thats a nice motor, and should work great as a wind generator.

You need to spin it up to see what output voltage you can get from it. The 120v rating means little when used as a generator, you can safely ignore that figure. The motor should make charging voltage ( 14 volts or more ) at a few hundred RPM. If you have access to a lathe, spin up the motor and find what RPM equals 14 volts. This is your startup RPM, the RPM that the windmill will start charging your batteries. If this RMP is in the range 100 to 500, your set.

Let us know how you go.

Glenn

Posted: 05:32am 30 Jan 2006

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That looks like a permanent magnet type and as Glenn says will be ideal as a generator provided you can spin it fast enough to give you a useful voltage.

I suspect you wont really see 2Kw from it but one can be optimistic I suppose.

If you short the wires can you turn the shaft by hand?  The harder it is to turn the better prospects you have.

Nice looking piece of equipment John.

Posted: 11:47pm 05 Feb 2006

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Hi John,

It depends on how you connect it up to your rotor. If you plan to attach a rotor directly to your 5/8" shaft then you could use a Xantrex C-40 charge controller.

You can also connect a digital meter up to the C-40 and remotely monitor your wind energy values such as W/V/A Ah per day/ Totallizing Ah's.

If you plan to use a geared system and the motor enjoys high RPM's then I would recomend a DC to DC converter like the one shown below.

Voltage Regulation Mode

Proportional:

This standard unit regulates the output voltage proportional to 1/4 the input when connected 48 V input and regulates the output to 4 X input when connected 12 V input. This characteristic, when connected across 4 X 12 V batteries in a 48 V configuration, will keep the batteries at equal voltages.

Fixed:

Special units are available for example EQ 12/48-30 RXX where XX is the voltage on the 12 V side that the voltage is to be regulated to. For example, EQ 12/48-30 R13.6 will output 13.6 V @ 30 amps to either power a 12 V load or charge a 12 V battery to 13.6 V.

Available from: http://www.solarconverters.com/ made in Guelph, Ontario, Canada

I will draw you up a wiring diagram if you like.

I have a 90 VDC TEFC cont duty 3/4 hp PM motor that has a 3/4" shaft and I am planning on using it for a homebrew windmill.

I hope this helps.

Michael Chownyk

Alternative Energy Resources
138 Bakersfield Dr., N1R 6X7
Cambridge, Ontario, Canada
Tel: (416) 805-8903 Fax: (519) 624-9737

solarenergy@rogers.com

Posted: 03:25am 09 Mar 2006

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Sorry for the delay to all the people that answer my post

I have been in the hosiptal for the last month and everything is better

now and I will start working on my system once the snow is gone

Thanks again John...