David Gibbons is one of the most extraordinary communicators I have met. He is an educator, visionary and knows how to connect the dots . His presentation at the GBEM conference in Holland last year was the show stopper.
This is an update on our Keppe Fan Challenge
Brad emailed me this morning. The good news is the Keppe people have now rated their fan from 50 to 65% in its simplest configuration. Nevertheless, by adding extra coils in strategic points of the stator and using appropriate rotor designs, the Keppe Motor can surpass 90% efficiency. This is more realistic
Here is part of the email:
90% Plus Efficiency
In case you missed it we ran a story on a simplistic and very available motor technology out of the USA that is now appearing in a multitude of consumer products: .http://revolution-green.com/2013/10/26/electronic-motor-iron-less-wire-less/
It is light weight, simple to build and an old idea revived in a very modern way. It si also something that can be manufactured easily without Copper windings or iron.
So I have decided to publish a challenge from a well known pulse motor inventor in Australia called Brad, Aka Tinman to most of us who follow him on forums.
This story is in 3 parts.
1. The challenge form Brad to Sterling
2. The video comparisons
3. An economic review of the Keppe Fan
I received this email today from Brad. I have removed the links from the videos as they are embedded below.
The Video Comparisons
The following two videos I would suggest you start viewing from the 6 minute mark. I would suggest that this is not a comparison that would stand up to scrutiny as they would have to use exactly the same fan, however the general idea is there. The idea is to actually have a challenge side by side.
Video 1 : Keppe Fan
Video 2 : Brad’s Rotary Transformer
The Keppe Economics
At the end of this article I have placed the link where you can purchase the Keppe Fan kit and book for $350 USD (including freight)
And that is where the problem is. I can purchase an equivalent fan for less that $20 here in the Philippines. So lets look at what I could do with the savings:
For less than $330 I can get a 120 watt solar panel, 1000 watt inverter (grid connect) that will more than power the fan, most likely have enough left over to charge the phone and run some lights. This would mean free electricity to run my fan. During winter I would be reversing my meter.So the question is why not spend the money on the Solar (or wind ) and really get free energy?
Another reasonable question is if the money was invested say for around 8% return, it would more than pay the any savings in electricity. Finally who in the hell can afford a fan like this in third world countries.
The other big question is the claims being made how much more efficient is the Keppe Fan? There are many debates on various forums and in the comments section of Freeenergynews.com. The fans I am using in the Philippines I have not measured the efficiency however the 16 inch is rated at 60 watts and I measured it at 53 watts at high speed. The 18 inch is also rated at 60 watts.
One of our regular commentators Mark Euthanasius posted the following on Sterling’s site (I copied it from Overunity.com)
If the motor powering this fan is similar in design to the motor that powers their desktop fan, then there is no remarkable technology. Those who remember the articles on the desktop fan may recall Keppe’s claims that the fan design resulted from their new “disinverted physics”, and operated on principles of resonance. Analysis of that design established that it is just a DC pulse motor that uses an optical commutator. There is no evidence of a new physics: inverted, disinverted, or otherwise. The fan motor and drive are not particularly efficient. The drive uses an optical interrupter switch to control when the motor winding is energized. The motor winding is energized in only one direction attracting the one pole of the rotor magnet and opposing the other. The result is that the motor only does work during less than half of a rotation and most of each rotation inertial carries the fan blades around. However because of a poor design, the coil current never goes to zero and for half of each rotation the coil actually produces counter torque. The circuit block responsible for this is labeled “Dissipative Flux Reset” in the block diagram that follows. That particular circuit form goes back to at a circa 1980 application note from International Rectifier. Other inefficiency results from the use of a power resistor as a way of dropping power to the motor coil to lower the speed. That method would not work if the motor operated on a principle of resonance as claimed by Keppe. The dropping resistor works because for a given line input voltage: the motor torque versus speed is a monotonically declining curve. The motor operates at the speed where that curve intersects the increasing torque versus speed function of the fan blades churning through air. Keppe represented that the desk fan was the result of a decade of research. the last state of the design as I saw it had multiple very serious safety flaws. So, what we have seen from Keppe before is a very mediocre design wrapped in creative, but meaningless terminology. Without specific evidence of actual measured performance I do not expect the ceiling fan to have deviated significantly from the desk fan design that Keppe said took them 10 years to develop.
Sterling, Keppe are not able to demonstrate high torque or quick start-up compared to other DC motors. Nor did they even try during that demonstration. What they did was basically a straw man comparison. They picked as their straw man a fan powered by a very cheap single phase AC induction motor. If there is a scourge in motors it is the single phase induction motor. They are found everywhere because they are incredibly cheap to build. They have been phased out of larger motor powered appliances like refrigerators and washing machines by energy efficiency regulations. You can still find them sucking down juice in things like cheap furnace blower motors.
I know you like these guys and the way that they run their community. Whatever they are doing with their community does not change the science of their very mediocre, and the last time I saw it, very unsafe motor design.
Sterling without any statement of measured or even claimed values “the most efficient ones available” doesn’t mean anything. I have surveyed some fan efficiencies and found various units from as low as 12 cfm/W to as high as the Aeratron that Dangus noted at 696 cfm/W. As a point of reference: Hunter which is a very big ceiling fan manufacturer only claims up to 176 cfm/W, while others like Emerson Electric basically do double that. Home Depot advertises Gossamer fans as very high efficiency, but they top out about 200 cfm/W. And as noted, Dangus found the Aeratrons that are 4X the Hunter, 3.5X Home Depot, and 2X the Emerson Electric product because they use really good airfoils.
In a fan the efficiency is as much a function of the airfoil design and the number of airfoils as it is the motor. If someone wants to know about the motor performance they need to see torque and power curves for the motor. If someone wants to compare fans as black boxes, then they need to see airflow volume and power under some stated conditions of temperature, humidity, and static pressure drop. Keppe does not provide these measures.
So Sterling the challenge is there from Brad. From my side, please explain what the economic benefits are?
I suggest that the readers come up with some ideas how this challenge may take place or indeed perhaps you may come up with something creative Sterling.
Link to purchase: http://www.keppemotor.com/en/KitKeppeMotor.php
|Kit and Manual 4.1: Advanced Fan Manufacturing GuideNew Kit and Manual Launch from the Keppe Motor Team
(Keppe Motor 4.1 is equivalent to a 50 Watt induction motor)You will save time and money with this amazing DIY 8”-table fan KIT powered by a 50W-equivalent Keppe Motor. Learn about this revolutionary technology doing your own working model. Complete KIT with circuit.
|Price US$ 295.00 (kit) + US$ 55.00 (universal shipping) = US$ 350.00|
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I am sure many of you will have comments to make. I have copied a few over from Overunity.com
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