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NEWSCIENCENEWSCIENCENEWSCIENCE - Sian In a device such ‘ . as an electric motor where fields are in a constant state of P| 5 = change, the net loss ee | in performance = from undirected lines of magnetic force can be significant. This is perhaps another andling reason why electrical engineers have ve-size avoided permanent magnets in motor ing so, design, as they introduce not only expense hat PM but also additional design challenges. The Ettridge solution to this issue, ith the _ illustrated in figure 4, is to provide the iction, motor with a magnetically permeable back Aless plate which acts to contain the magnetic ‘tion in lines of force of the permanent magnets. space This ensures that the magnetic signature of euseof the technology is relatively clean and the ystems. rotor action can function without excessive of the magnetic drag. It also means that the fashion magnetic fields have to cross only two air ing cost gaps as opposed to a more conventional notors four. Therefore, another principle of the " Ettridge motor technology is the creation of a magnetic flux circuit. (b) Gemini a - We so os ZNO) S PS a Figure ~ Figure 3 (a) Classic (b) Gemini Theoretically, it is capable of handling twice the power of a same-size conventional motor and, while doing so, remain[ing] at the high efficiencies that PM motors are capable of. "A reduction in size comes with the obvious benefit of material reduction, hence savings in weight and cost. A less obvious advantage is that a reduction in size opens up markets where space limitations have previously led to the use of costly and inefficient transmission systems. "The manufacturing principles of the Gemini motor are conventional in fashion and would require a minimal retooling cost as compared with other novel motors emerging from the field of research." Figure 5 likely that the commercial popularity of electric motor technology will only increase in the years ahead. Postscript Gold medals were awarded for the Ettridge Commutator at the International Invention and New Products Exhibition held at Geneva, Switzerland, in May 2004, and for the Gemini Electric Motor at INPEX 2004, the inventions show held in Pittsburgh, Pennsylvania, USA, in May. For more information on the Gemini patent, refer to International Patent Application number PCT/AU01/00707 dated 13 June 2001. oo Flux Paths Permanent magnets require a complete flux path between the poles; and unless the motor provides a path for these vectors, the flux lines are completed through air. If lines of force permeate the apparatus in such a fashion, the result may be to cause drag upon the rotor and reduce the efficiency of the device. Energy Recovery A further development of the Ettridge technology was the integration of a regen- erative capability. Apparatus was developed that enabled current to be extracted from the motor while in operation, without placing a load upon the motor. While many motors fea- ture an ability to draw energy from the motor while braking or in other low-load scenarios, the Gemini motor can produce a real output at all times, even while under heavy load. This output can be fed back into the motor or used to recharge the source, and augments the efficiency gains already apparent in the design. A number of different implementations exist for this method, and one is illustrated in figure 5, taken from the patent. About the Inventor: John Patrick Ettridge is a 59-year-old Australian who has been inventing devices for much of his life, most seriously since 1969 when he invented his orbital engine. Information on a number of his inventions can be seen at his home webpage, http://www.picknowl.com.au/homepages/ jpettridge. For more details on the Gemini motor, contact John Ettridge at md@geminielectric- motor.com or jpettridge@picknowl.com.au, or visit the Gemini motor website at http:/Awww.geminielectricmotor.com. About the Author: Tim Harwood, MA, has followed the "free energy" scene since the early days of the cold fusion movement. With genuine postgraduate research qualifications, he seeks to bring aca- demic rigour, combined with eloquence of expression, to free energy research. He is probably best known for the CD motor pro- ject, which helped popularise Adams motor technology, and the POD project, as well as for running the old Parallel Path and Adams motor egroups (see http://www.geocities.com/ theadamsmotor/index.html). His article on Joe Flynn's Parallel Path Magnetic Technology was published in NEXUS 11/01. Tim can be reached by email at timharwood@usa.net. Summary The patented Ettridge Gemini electric motor technology features a number of innovative design characteristics that are likely to become increasingly common in the next generation of electric motors. Not only can significant efficiency gains be realised but more importantly, for many applications, power-to-weight ratios can also be improved. With this in mind, it is Figure 4 50 = NEXUS www.nexusmagazine.com OCTOBER — NOVEMBER 2004