That’s what one who visits Utterpower’s pages suggests.
Here’s an email snippet..
“What I am trying to say is that i think that PMG only requires 1hp electric motor for every 1kw output and that should be clearly seen at the input of the VFD in the form of about approximately 1150w input for every 1kw output at the gen head, thanks troy”
More background if you need it, or simply scroll down:
hi george, i talked with you earlier about connecting your pmg to your 10 hp motor and vfd to do a comparison analysis. you said you had some test gens that were in your shop. i believe if you connect the motor to the gen with a lovejoy coupling and wire it 240vac output and connect purely resistive lights to it at 3kw load it will read 240vac at 12.5 amps to the load from the gen output. with a two pole electric induction motor and a vfd that is converting single phase to three phase there should be about a 10% increase in input at the vfd to the out put of the gen head. you should see about 14-15 amps at 240vac single phase to the vfd and 12.5 amps on the output to the load. now in the field they say 2hp per 1kw which would mean 6hp for 3kw. however 6hp on that 10hp motor and vfd will be about 25-27 amps at 240vac on the single phase vfd input coming from the panel box to the vfd. I want to prove point to the gearheads in my area that your drive, motor(prime mover), and gen head at 3 kw output will only consume around 3.4kw from the panel box to produce 3kw at the gen head. if it takes 2hp then thats around 2.2kw from the panel box and so that gen would only be at most 50% efficient and i think it is higher than that. with the vfd losses of 1%, motor of around 5%, and gen around 5%, the input single phase should only be 10-15% higher than the output at the gen head. bottom line i want to couple that gen head to an electric motor and vfd and strap a 3kw load to it and test the input kw to the vfd. i bet if done correctly 3kw out of the gen only requires 3.4kw input, not 6-6.4kw. i can buy one from you test it and see or pay you to test it for me, i probably won’t use the gen after that i just to test that theory and answer for myself. my phone is 803-xxx-xxxx when you figure what you want to do please give me a call.
OK, so let me give this a shot, we are going to post this at Utterpower because there are other people who believe in similar stuff.
horsepower is horsepower period, it matters not what makes it, it is simply RPM times torque, matters not if a mule makes it or an electric motor.
We know that one inch of copper wire has a loss, so when we put electrical energy into one end, we expect less out the other end period.
So in your case… you believe we can add a variable frequency drive, followed by an electric motor (with known losses), a drive coupler and then the PMG and effectively double the efficiency over the rule of thumb, 2HP=1KW?
In stead of offering to pay me to set this up on the test bench and prove your theory, why not spend an hour thinking or learning?
If what you say is real, then a lot of really smart people are ignoring a real simple way of addign efficiency.. Imagine, engineers have been struggling to produce fractional gains in efficiency for years, and you’re going to approximately double it?
Now I do agree that about 30% of Americans think the same way you do. There’s little difference between ‘life’s energy’ and other forms of energy. We seem to have a bumper crop of people who would vote for a minimum wage of let’s say $95 and hour. This would create a lot of income and then we could tax the hell out of them and have enough money for every government program. Patty Murray, Barbara Boxer, Nancy Pelosi are in this camp.
Just a few minutes of ‘critical thinking’ make it all clear, if anything was clear to start with.. wait a minute! even critical thought is not helping right now….