OLEG D. JEFIMENKO West Virginia University. Electrostatic M o t o r s It is also interesting to note that certain types of electrostatic motors were frequently. From Oleg D. Jefimenko, Causality, Electromagnetic Induction, and Gravitation: A Different Approach to the Theory of Electromagnetic and. Electrostatic Motors. Oleg Jefimenko and David K. Walker. Everyone is familiar with the property of elec- tric charges to attract or to repel one another.
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As the thimbles grazed that jar, a spark would again transfer charge, which was of opposite polarity.
Oleg D. Jefimenko
It described an electrostatic motor fitted with a rotor that carried no electrodes. The entire motor, as pictured here, is a plastic disk Poggendorff used glass and two electrodes.
The rotor consisted of a pair of electrets in the shape of sectors supported at opposite ends of a shaft. The field was tapped with an antenna consisting of feet of No. When opposing combs on opposite sides of the glass were charged in opposite polarity to potentials in excess of 2, volts, air in the vicinity of the points on both sides of the glass was ionized.
Never fly it below clouds or leave it aloft unattended. Static balance was achieved by experimentally adding small bits of adhesive tape to the inner surface of the aluminum foil that lines the cylinder until the rotor remained stationary at all positions to which it was set by hand. The motor can be made self-starting and unidirectional by slanting the knife-edges.
Although a foot vertical antenna can be handled safely in fair weather, it can pick up a lethal charge during thunderstorms. A pair of indented setscrews could be substituted for the clock bearings. A point-studded balloon tethered by a wire at an altitude of 75 meters might be expected to deliver.
Today, we use electromagnetic motors almost exclusively.
The generator is safe, too. An electret is an insulator with a permanent electrostatic charge. Motors of mmotors type are based on the force of mutual attraction between unlike electric charges and the mutual repulsion of like charges.
Inhe was awarded the Sigma Xi Prize.
Oleg D. Jefimenko – Wikipedia
Centrifugal forces at the ends were degrees out of phase, thus motora a couple. Jefimenko has worked for the development of the theory of electromagnetic retardation and relativity. When the machine was electroztatic by hand, it ran equally well in either direction. We filed down all edges on the rotor adn the windows to make sure there were no beads or chips dragging.
The working surface of the rotors should be made of a fairly thin plastic, such as Plexiglas or Mylar. Views Read Edit View history. The distances between the electrodes and the electrets were needlessly large, so that the forces of attraction and repulsion were needlessly weak.
Jefimenko gives both motors an initial charge from a 20,volt generator.
Franklin charged his jars with an electrostatic generator. To check for dynamic balance suspend the motor freely with a string, run it at low speed and judge by the wiggle where a counterweight must be added. One design consists of an electret in the shape of a wafer-thin sheet of Mylar supported by a flat disk of balsa wood millimeters in diameter and three millimeters thick. Same things goes for the E field created by Faraday induction.
Jefimenko worked on the generalization of Newton’s gravitational theory to time-dependent systems. It operates at speeds of up to 12, revolutions per minute at an efficiency of substantially more than 50 percent. Pohl, displayed two yard-square elecctrostatic plates mounted on the end of a pole. With one grain of gunpowder one nefimenko achieve so much as with one hundred pounds.
If the electrodes are spaced too close, sparks tend to jump from electrode to electrode around the rotor, thereby in effect short-circuiting the machine. And so are the motors. Corona motors require no brushes or commutators.
When we crank up the electrostatic motor at the top of this page, people always want to know what makes it run. Inthe German physicist J. As the electret moved between the attracting plates, however, the commutator switched the plates to matching polarity.
You are jefimemko using your WordPress. The Poggendorff motor looked simple; we slapped it together in a couple of hours, hooked up the power source — and nothing happened. Machines of this kind can be made of almost any inexpensive dielectric materials, including plastics, wood and even cardboard. Hook the other side of the motor to ground. Some experimenters substitute Halowax for the rosin. Such antennas produce about a jrfimenko of current.
He has succeeded in constructing demonstration motors that run continuously off atmospheric electricity.
The effect, which is variously known as St. The only essential metal parts are the electrodes and their interconnecting leads. Electret Scientific, Star City, The foot antenna wire can hold enough charge to give a substantial jolt, even during fair weather. It employed stiffbacked single-edge razor blades as electrodes.
Jefimenko has demonstrated a similar motor that was designed to turn at a rate of about 60 revolutions per minute and develop a millionth of a horsepower on a foot antenna having a small polonium probe at its upper end.