rotoverter for power generation

[steve_chow]

Hi revizal

Please check this schematic http://www.wnysupply.com/index.cfm/fa/categories.main/parentcat/25431
same as RV setup except running cap are fixed and they are using 230 volts insted of 115 Volts
which they call static converter.Only reasonn I want to buy this kit because it has everything what I need for RV electrical set up.
Please advice.

I need 2hp for my pool pump.
I bought following
1)Baldor EM3770T 7.5 HP( if I need I can get 15 and 20HP . please advice)
2)Wagan 1000 Watt Slim Power Inverter , part # 2294(Which I will convert to VF inverter)
3) alternator- Pancake style 10 hp 48 volts permanent magnet DC motor , no cogging
4) alternator -output 300 amps at 14 volts   -I disconnected the field and install neo magnet and I am getting same output.

Do you know where I can buy flyweels ?

regards

[steve_chow]

Hi

I am trying to replicate the Rv,
Battery charge start resonance collector circuit , 12volt DC motor coupled with baldor 7.5 hp motor.
But having problem to locate Center Y.
Does any one know how to find Center Y in 7.5hp Baldor motor(EM3770T) ?
Please help..

regards

Chow

[wattsup]

@steve_chow

The pdf for your motor can be found here.

http://www.baldor.com/products/perfdata.asp?1=1&catalog=EM3770T&product=AC+Motors&family=General+Purpose|vw_ACMotors_GeneralPurpose&winding=07WGW721&rating=40CMB-CONT

What do you mean by Center Y.

Under RV, you need to connect the motor at the 460volts (high voltage) method and use one of the phases through a capacitor bank. Look at any of the photos here:

http://purco.qc.ca/ftp/Wattsups%27%20stuff/rotoverter/

But the most important spec of this motor is the rpm being at 1750. Usually RV drive motors are better at 3600 rpm because the generator side needs to turns at or near that rpm, so the specs of your generator will be important to understand.

You mention "no cogging" regarding your alternator. I really don't think that is possible. All alternators will give you drag as they produce output and this will ultimately reduce the rpm of the drive motor and increase amperage draw and that is one of the reasons a 3600 rpm motor is more suitable. But this will depend on the specs of the alternator.

[steve_chow]

Hi

thanks for response..
My baldor motor RPM is 1760, and with std RV setup it takes about 40 watts to run without load with same RPM.

Alternator I am using needs about 1200 rpm to produce 14 volts, but when I coupled PM with alternator , PM try to start but stop...
am I doing something wrong ? or Alternator needs more HP ?

Alternator I am using is permanent magnet alternator/motor  and it has no cogging when I rotate by hand...
Also i have a car alternator which I modified with permanent magnet...

Now I am trying to make RV setup using attached circuit diagram, but I am having problem to finding  center Y in PM(baldor motor)
please advice...

regards
Chow

[wattsup]

@steve_chow

That diagram you are using is wrong. The line with the cap "L" should be removed and the line going left above the number 12 should be removed.

See the diagram shown below.

You need at least two caps in parallel but the start cap is on a switch. You switch the start cap on to start the motor and when it is running well you remove the start cap.

But the 4uf may be too small. Usually the caps I used are in the 10-15uf range 370 volts but with my capacitor bank, switching in and out the caps is easy to find the really best running situation. You may consider using the other 4uf as "L" and use it with the other in parallel.

As for the alternator, they are the worst things to use. No cogging is normal when the alternator is not loaded but them suckers are really stubborn to turn when they are fully loaded. Just short the positive and negative together and try to turn it.

For a load off the DC battery, you may consider using several 12vdc light bulbs and add them in parallel, one by one and as you add another bulb, see how the drive motor holds up. Use the bulbs with and without the battery connected since the battery could be causing the alternator to put out too much power and hence, it will stall the drive motor.