Early this AM, I find this in the mail box. I share it because this is at the root of all promises to deliver a free lunch!
Subject: PMG questions
Message: Hi, I wondered if you could answer a couple questions. Im a DIY’er but don’t have a ton of electrical schooling, mostly trial-n-error. I want to know how many hp would it take to spin a 25kw PMG and get at least 12KW usable power. Is this even possible? I have seen modified generators that power there drive motor. Also, can the 3phase ac voltage from a PMG be ran through a line/hz stabalizer and used for reliable home-use power source?
Forrest I’m glad you wrote, and I ‘d like to share that there are no PMGs on the planet powered by an electric motor, powered by the PMG. There is an easy way to remember how reality works in electrical and mechanical devices.
In order for a motor and Generator to run in a closed loop, you’d need a 100% efficient motor, and a 100% efficient generator, and then a perfect environment in which to run it.
Fact is, there’s always losses in these devices, and always will be. A typical car alternator is a (three phase generator), and due to the engineering criteria, some are about 60% efficient, maybe less. So, we expect the energy out of the device to be far less than what we put in. The motor side is similar, we NEVER get out what we put in, and where do the losses go? A portion of it can be felt as heat, and as you know, it takes energy to make heat.
In the physical world, we expect only losses, (no gains) we need dump far more energy into our machines than what we get out. You can (Always) assume that if you put 100 units of energy into a machine, you will get less than 100 units out.
As for the financial world, the same is true.. the US Government is a fine example of losses. No matter what you give them, you WILL get less back IF you MEASURE energy in VS energy out. The deception (confusion) comes into play when the Government runs a Ponzi, and some who put energy into the system get more out than they put in.
A generator paired with a motor is a great demonstrator of unsustainable losses. If you use an exterior source of energy to bring this combination up to speed, and then expect it to run, you get only disappointment out of the machine.
This is exactly the way Obama Health care will work. The fact is, there is no source of money so great as to cover the losses of the inefficiency of Government involvement.
Your second question about a three phase generator.. and frequency, the frequency is normally dictated by the RPM of the generator shaft, this is a mechanical thing. We can add some complication to the process in a second stage, but most anything we do adds additional losses, and we expect even less usable energy out than we put in.
Youtube is full of free energy videos, motor generator sets running in a loop. Fact is: They are all BS. There are no free rides in energy or finance, someone always pays. Votes are easily bought with the promise that the other guy is going to buy your lunch, eventually the guy buying your lunch leaves the game. It’s the way it works. There are no free lunches, but countless people who believe they can eat somebody elses lunch, but not for long.
Here in my State, a person I know worked all summer on a free lunch program. Her job was to help make 1500 lunches a day, and deliver them to 20 different sites to be distributed to children under 18 in the city of Kent, first come first serve.. It’s a new role the Kent School district is taking on, and at the other end of it is tax payers that may be having a hard time paying their ever-increasing property taxes, water, power, and utility bills.